Commit Graph

242 Commits

Author SHA1 Message Date
Anup Patel
1da92afbbf mailbox: bcm-flexrm-mailbox: Use txdone_ack instead of txdone_poll
Currently, FlexRM driver uses txdone_poll method of Linux Mailbox
to model the send_data() callback. To achieve this, we have introduced
"last_pending_msg" pointer for each FlexRM ring which keeps track of
the message that did not fit in the FlexRM ring.

This patch updates FlexRM driver to use txdone_ack method instead of
txdone_poll method because txdone_poll is not efficient for FlexRM
and requires additional tracking in FlexRM driver.

Also, moving to txdone_ack method helps us remove "last_pending_msg"
pointer and last_tx_done() callback.

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-08-31 08:39:04 +05:30
Anup Patel
1f7466c6b4 mailbox: bcm-flexrm-mailbox: Use bitmap instead of IDA
Currently, we are using IDA library for managing IDs
on a FlexRM ring. The IDA library dynamically allocates
memory for underlying data structures which can cause
potential locking issue when allocating/free IDs from
flexrm_new_request() and flexrm_process_completions().

To tackle this, we replace use of IDA with bitmap for
each FlexRM ring and also protect the bitmap with FlexRM
ring lock.

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-08-31 08:39:03 +05:30
Anup Patel
6d2061b981 mailbox: bcm-flexrm-mailbox: Fix mask used in CMPL_START_ADDR_VALUE()
The mask used in CMPL_START_ADDR_VALUE() should be 27bits instead of
26bits. This incorrect mask was causing completion writes to 40bits
physical address fail.

This patch fixes mask used in CMPL_START_ADDR_VALUE() macro.

Fixes: dbc049eee7 ("mailbox: Add driver for Broadcom FlexRM
ring manager")

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-08-31 08:39:00 +05:30
Anup Patel
acf7e50a6b mailbox: bcm-flexrm-mailbox: Add debugfs support
This patch adds debugfs support to Broadcom FlexRM driver
so that we can see FlexRM ring state when any issue happens.

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Vikram Prakash <vikram.prakash@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-08-31 08:38:59 +05:30
Anup Patel
6ac17fe8c1 mailbox: bcm-flexrm-mailbox: Set IRQ affinity hint for FlexRM ring IRQs
This patch set IRQ affinity hint for FlexRM ring IRQ at time of
enabling ring (i.e. flexrm_startup()). The IRQ affinity hint will
allow FlexRM driver to distribute FlexRM ring IRQs across online
CPUs so that all FlexRM ring IRQs don't land in CPU0 by default.

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-08-31 08:38:44 +05:30
Punit Agrawal
66ed4cac66 mailbox: pcc: Drop uninformative output during boot
When booting on an ACPI enabled system that does not provide the
Platform Communications Channel Table (PCCT), the pcc mailbox driver
prints -

[    0.484261] PCCT header not found.

during probe before returning -ENODEV.

This message clutters the bootlog and doesn't provide any useful
information. Drop this message.

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: Alexey Klimov <alexey.klimov@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-08-10 01:33:01 +02:00
Hoan Tran
ecfc1599ef mailbox: pcc: Fix crash when request PCC channel 0
When PCCT is not available, kernel crashes as below when requests PCC
channel 0. This patch fixes this issue.

[    0.920454] PCCT header not found.
...
[    8.031309] Unable to handle kernel NULL pointer dereference at virtual address 00000010
[    8.031310] [0000000000000010] user address but active_mm is swapper
[    8.031312] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[    8.031313] Modules linked in:
[    8.031316] CPU: 31 PID: 1 Comm: swapper/0 Tainted: G        W       4.13.0-rc1 #18
[    8.031317] Hardware name: AppliedMicro(R) 07/20/2017
[    8.031318] task: ffff809ef3b08000 task.stack: ffff809ef3b10000
[    8.031322] PC is at pcc_mbox_request_channel+0x8c/0x160
[    8.031325] LR is at xgene_slimpro_i2c_probe+0x1c0/0x378
[    8.031326] pc : [<ffff000008899450>] lr : [<ffff000008819dac>] pstate: 00000045
[    8.031327] sp : ffff809ef3b13bd0
[    8.031327] x29: ffff809ef3b13bd0 x28: ffff000008ed90a0
[    8.031329] x27: ffff000009091000 x26: ffff000008e50470
[    8.031330] x25: ffff000008ed9100 x24: ffff809eefd9ac30
[    8.031332] x23: 0000000000000000 x22: ffff0000090e3e10
[    8.031333] x21: ffff0000090e3000 x20: 0000000000000000
[    8.031335] x19: 0000000000000000 x18: 0000000000087ffc
[    8.031336] x17: 2fe48d76a78303f0 x16: 0000000000087ffc
[    8.031337] x15: ffff000000000000 x14: 0000000000000000
[    8.031339] x13: 0000000000000000 x12: 0000000000000018
[    8.031340] x11: 0000000000000018 x10: 0101010101010101
[    8.031342] x9 : 0000000000000000 x8 : 7f7f7f7f7f7f7f7f
[    8.031343] x7 : fefefefeff6b646d x6 : 0000008080808080
[    8.031345] x5 : 0000000000000000 x4 : 0000000000000001
[    8.031346] x3 : 0000000000000000 x2 : ffff000008819b64
[    8.031348] x1 : 0000000000000000 x0 : 0000000000000000
...
[    8.031393] Call trace:
[    8.031394] Exception stack(0xffff809ef3b13a00 to 0xffff809ef3b13b30)
[    8.031395] 3a00: 0000000000000000 0001000000000000 ffff809ef3b13bd0 ffff000008899450
[    8.031397] 3a20: ffff809f7e1f9a10 ffff000008f60be0 0000000000000001 ffff809ef3b13b7c
[    8.031398] 3a40: ffff809f7e1f9a10 0000000000000000 ffff000009091000 0000000000000003
[    8.031399] 3a60: ffff000009091000 0000000000000003 ffff809ef3b13a80 ffff0000084e0794
[    8.031400] 3a80: ffff809ef3b13a90 ffff00000850bb64 ffff809ef3b13ad0 ffff00000850bf34
[    8.031402] 3aa0: 0000000000000000 0000000000000000 ffff000008819b64 0000000000000000
[    8.031403] 3ac0: 0000000000000001 0000000000000000 0000008080808080 fefefefeff6b646d
[    8.031404] 3ae0: 7f7f7f7f7f7f7f7f 0000000000000000 0101010101010101 0000000000000018
[    8.031405] 3b00: 0000000000000018 0000000000000000 0000000000000000 ffff000000000000
[    8.031406] 3b20: 0000000000087ffc 2fe48d76a78303f0
[    8.031409] [<ffff000008899450>] pcc_mbox_request_channel+0x8c/0x160
[    8.031410] [<ffff000008819dac>] xgene_slimpro_i2c_probe+0x1c0/0x378
[    8.031413] [<ffff0000085e84dc>] platform_drv_probe+0x50/0xbc
[    8.031414] [<ffff0000085e68a4>] driver_probe_device+0x21c/0x2d0
[    8.031416] [<ffff0000085e6a04>] __driver_attach+0xac/0xb0
[    8.031417] [<ffff0000085e4a78>] bus_for_each_dev+0x58/0x98
[    8.031418] [<ffff0000085e61e4>] driver_attach+0x20/0x28
[    8.031419] [<ffff0000085e5e0c>] bus_add_driver+0x1c8/0x22c
[    8.031421] [<ffff0000085e7324>] driver_register+0x60/0xf4
[    8.031422] [<ffff0000085e8420>] __platform_driver_register+0x4c/0x54
[    8.031425] [<ffff000008e96dd0>] xgene_slimpro_i2c_driver_init+0x18/0x20
[    8.031426] [<ffff000008083144>] do_one_initcall+0x38/0x124
[    8.031429] [<ffff000008e50d0c>] kernel_init_freeable+0x190/0x22c
[    8.031431] [<ffff0000089eac30>] kernel_init+0x10/0xfc
[    8.031432] [<ffff000008082ec0>] ret_from_fork+0x10/0x50
[    8.031434] Code: cb030e63 8b030013 b140067f 54fffda8 (f9400a61)
[    8.031448] ---[ end trace 14eb48a4e1e1f9fb ]---

Signed-off-by: Hoan Tran <hotran@apm.com>
Acked-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-07-26 02:11:47 +02:00
Linus Torvalds
21c19bc7ee Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox updates from Jassi Brar:

 - Minor improvement : avoid requiring unnecessary startup/shutdown
   callback that many drivers seem to not need

 - New controller driver for Qualcomm's APCS IPC

* 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox: Introduce Qualcomm APCS IPC driver
  dt-bindings: mailbox: Introduce Qualcomm APCS global binding
  mailbox: Make startup and shutdown ops optional
2017-07-07 10:24:07 -07:00
Bjorn Andersson
25bfee16d5 mailbox: Introduce Qualcomm APCS IPC driver
This implements a driver that exposes the IPC bits found in the APCS
Global block in various Qualcomm platforms. The bits are used to signal
inter-processor communication signals from the application CPU to other
masters.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-06-14 17:47:19 +05:30
Bjorn Andersson
b7133d6fcd mailbox: Make startup and shutdown ops optional
Some mailbox hardware doesn't have to perform any additional operations
on startup of shutdown, so make these optional.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-06-14 17:47:09 +05:30
David E. Box
c7a1dfb95e ACPICA: Add support for new PCCT subtables
ACPICA commit e7b817e3c405a4fb9ae9ee7ae4992b8c1f20d284

Extended PCC Subspaces (types 3 and 4)

Link: https://github.com/acpica/acpica/commit/e7b817e3
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-06-12 14:58:39 +02:00
Sudeep Holla
cb710ab1d8 mailbox: handle empty message in tx_tick
We already check if the message is empty before calling the client
tx_done callback. Calling completion on a wait event is also invalid
if the message is empty.

This patch moves the existing empty message check earlier.

Fixes: 2b6d83e2b8 ("mailbox: Introduce framework for mailbox")
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-04-27 16:20:04 +05:30
Sudeep Holla
cc6eeaa302 mailbox: skip complete wait event if timer expired
If a wait_for_completion_timeout() call returns due to a timeout,
complete() can get called after returning from the wait which is
incorrect and can cause subsequent transmissions on a channel to fail.
Since the wait_for_completion_timeout() sees the completion variable
is non-zero caused by the erroneous/spurious complete() call, and
it immediately returns without waiting for the time as expected by the
client.

This patch fixes the issue by skipping complete() call for the timer
expiry.

Fixes: 2b6d83e2b8 ("mailbox: Introduce framework for mailbox")
Reported-by: Alexey Klimov <alexey.klimov@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-04-27 16:20:04 +05:30
Sudeep Holla
c61b781ee0 mailbox: always wait in mbox_send_message for blocking Tx mode
There exists a race when msg_submit return immediately as there was an
active request being processed which may have completed just before it's
checked again in mbox_send_message. This will result in return to the
caller without waiting in mbox_send_message even when it's blocking Tx.

This patch fixes the issue by waiting for the completion always if Tx
is in blocking mode.

Fixes: 2b6d83e2b8 ("mailbox: Introduce framework for mailbox")
Reported-by: Alexey Klimov <alexey.klimov@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Alexey Klimov <alexey.klimov@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-04-27 16:20:04 +05:30
Anup Patel
73874913d5 mailbox: Remove depends on COMPILE_TEST for BCM_FLEXRM_MBOX
The Broadcom FlexRM mailbox driver uses platform MSI support but
not all ARCHs provide asm/msi.h. Due to this, we get compilation
error in Broadcom FlexRM mailbox driver via linux/msi.h on ARCHs
which lack asm/msi.h.

This patch removes "depends on COMPILE_TEST" for Kconfig option
BCM_FLEXRM_MBOX so that Broadcom FlexRM mailbox driver is only
compiled for ARM64.

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-03-29 11:08:30 +05:30
Alexey Klimov
4605fff00b mailbox: check ->last_tx_done for NULL in case of timer-based polling
It is allowed by code to register mailbox controller that sets txdone_poll
flag to request timer-based polling with missed ->last_tx_done() method.
If such thing happens and since presence of last_tx_done() is not checked
it will fail in hrtimer callback function txdone_hrtimer() when first
message will be transmitted.

This patch adds check for this method and logging of error on
registration of mailbox controller if it requested timer-based polling.

Signed-off-by: Alexey Klimov <alexey.klimov@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-03-28 23:52:02 +05:30
Anup Patel
dbc049eee7 mailbox: Add driver for Broadcom FlexRM ring manager
Some of the Broadcom iProc SoCs have FlexRM ring manager
which provides a ring-based programming interface to various
offload engines (e.g. RAID, Crypto, etc).

This patch adds a common mailbox driver for Broadcom FlexRM
ring manager which can be shared by various offload engine
drivers (implemented as mailbox clients).

Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Pramod KUMAR <pramod.kumar@broadcom.com>
Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-03-28 23:33:30 +05:30
Steve Lin
fc2041c541 mailbox: bcm-pdc: Add Northstar Plus support to PDC driver
Adds support for Northstar Plus (NS+) products to the PDC mailbox
driver.  The PDC driver was originally written to support the PDC
ring manager in the Northstar2 (64-bit) device.  The NS+ (32 bit
device) uses an almost identical ring manager, though with a
different name.  We just need to check for the type of hardware in
use, in order to write the appropriate interrupt configuration register.
Also updated DMA width to be correct for both NS+ and NS2.

Tested on NS+ and NS2.

Signed-off-by: Steve Lin <steven.lin1@broadcom.com>
Acked-by: Jon Mason <jon.mason@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-03-28 23:27:56 +05:30
Bhumika Goyal
8ce33c6ff3 mailbox: constify mbox_chan_ops structures
Check for mbox_chan_ops structures that are only stored in the ops field
of a mbox_controller structure. This field is of type const struct
mbox_chan_ops *, so mbox_chan_ops structures having this property can be
declared as const.
Done using Coccinelle:

@r1 disable optional_qualifier @
identifier i;
position p;
@@
struct mbox_chan_ops i@p = {...};

@ok1@
identifier r1.i;
struct hi6220_mbox mbox;
struct slimpro_mbox ctx;
position p;
@@
(
mbox.controller.ops=&i@p
|
ctx.mb_ctrl.ops=&i@p
)

@bad@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p

@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct mbox_chan_ops i;

File size details:

   text	   data	    bss	    dec	    hex	filename
   2310	    248	      0	   2558	    9fe	drivers/mailbox/hi6220-mailbox.o
   2366	    192	      0	   2558	    9fe	drivers/mailbox/hi6220-mailbox.o

   1500	    248	      0	   1748	    6d4 mailbox/mailbox-xgene-slimpro.o
   1556	    192	      0	   1748	    6d4 mailbox/mailbox-xgene-slimpro.o

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2017-03-28 23:27:32 +05:30
Ingo Molnar
174cd4b1e5 sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h>
Fix up affected files that include this signal functionality via sched.h.

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-03-02 08:42:32 +01:00
Thomas Gleixner
8b0e195314 ktime: Cleanup ktime_set() usage
ktime_set(S,N) was required for the timespec storage type and is still
useful for situations where a Seconds and Nanoseconds part of a time value
needs to be converted. For anything where the Seconds argument is 0, this
is pointless and can be replaced with a simple assignment.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
2016-12-25 17:21:22 +01:00
Linus Torvalds
9be962d525 More ACPI updates for v4.10-rc1
- Move some Linux-specific functionality to upstream ACPICA and
    update the in-kernel users of it accordingly (Lv Zheng).
 
  - Drop a useless warning (triggered by the lack of an optional
    object) from the ACPI namespace scanning code (Zhang Rui).
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Merge tag 'acpi-extra-4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more ACPI updates from Rafael Wysocki:
 "Here are new versions of two ACPICA changes that were deferred
  previously due to a problem they had introduced, two cleanups on top
  of them and the removal of a useless warning message from the ACPI
  core.

  Specifics:

   - Move some Linux-specific functionality to upstream ACPICA and
     update the in-kernel users of it accordingly (Lv Zheng)

   - Drop a useless warning (triggered by the lack of an optional
     object) from the ACPI namespace scanning code (Zhang Rui)"

* tag 'acpi-extra-4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / osl: Remove deprecated acpi_get_table_with_size()/early_acpi_os_unmap_memory()
  ACPI / osl: Remove acpi_get_table_with_size()/early_acpi_os_unmap_memory() users
  ACPICA: Tables: Allow FADT to be customized with virtual address
  ACPICA: Tables: Back port acpi_get_table_with_size() and early_acpi_os_unmap_memory() from Linux kernel
  ACPI: do not warn if _BQC does not exist
2016-12-22 10:19:32 -08:00
Rafael J. Wysocki
c8e008e2a6 Merge branches 'acpica' and 'acpi-scan'
* acpica:
  ACPI / osl: Remove deprecated acpi_get_table_with_size()/early_acpi_os_unmap_memory()
  ACPI / osl: Remove acpi_get_table_with_size()/early_acpi_os_unmap_memory() users
  ACPICA: Tables: Allow FADT to be customized with virtual address
  ACPICA: Tables: Back port acpi_get_table_with_size() and early_acpi_os_unmap_memory() from Linux kernel

* acpi-scan:
  ACPI: do not warn if _BQC does not exist
2016-12-22 14:34:24 +01:00
Lv Zheng
6b11d1d677 ACPI / osl: Remove acpi_get_table_with_size()/early_acpi_os_unmap_memory() users
This patch removes the users of the deprectated APIs:
 acpi_get_table_with_size()
 early_acpi_os_unmap_memory()
The following APIs should be used instead of:
 acpi_get_table()
 acpi_put_table()

The deprecated APIs are invented to be a replacement of acpi_get_table()
during the early stage so that the early mapped pointer will not be stored
in ACPICA core and thus the late stage acpi_get_table() won't return a
wrong pointer. The mapping size is returned just because it is required by
early_acpi_os_unmap_memory() to unmap the pointer during early stage.

But as the mapping size equals to the acpi_table_header.length
(see acpi_tb_init_table_descriptor() and acpi_tb_validate_table()), when
such a convenient result is returned, driver code will start to use it
instead of accessing acpi_table_header to obtain the length.

Thus this patch cleans up the drivers by replacing returned table size with
acpi_table_header.length, and should be a no-op.

Reported-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-12-21 02:36:38 +01:00
Linus Torvalds
f95adbc1f7 Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox updates from Jassi Brar:

 - new features (poll and SRAM usage) added to the mailbox-test driver

 - major update of Broadcom's PDC controller driver

 - minor fix for auto-loading test and STI driver modules

* 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox: mailbox-test: allow reserved areas in SRAM
  mailbox: mailbox-test: add support for fasync/poll
  mailbox: bcm-pdc: Remove unnecessary void* casts
  mailbox: bcm-pdc: Simplify interrupt handler logic
  mailbox: bcm-pdc: Performance improvements
  mailbox: bcm-pdc: Don't use iowrite32 to write DMA descriptors
  mailbox: bcm-pdc: Convert from threaded IRQ to tasklet
  mailbox: bcm-pdc: Try to improve branch prediction
  mailbox: bcm-pdc: streamline rx code
  mailbox: bcm-pdc: Convert from interrupts to poll for tx done
  mailbox: bcm-pdc: PDC driver leaves debugfs files after removal
  mailbox: bcm-pdc: Changes so mbox client can be removed / re-inserted
  mailbox: bcm-pdc: Use octal permissions rather than symbolic
  mailbox: sti: Fix module autoload for OF registration
  mailbox: mailbox-test: Fix module autoload
2016-12-20 15:22:01 -08:00
Sudeep Holla
db4d22c07e mailbox: mailbox-test: allow reserved areas in SRAM
When CONFIG_SRAM is enable and the SRAM region is found, the entire SRAM
region resource is requested and marked as occupied by SRAM driver even
if certain parts of regions is marked reserved.

It's quite possible that a small region of the SRAM is reserved for all
the mailbox communication and hence it may fail to request the region
as it's already marked busy region.

This patch tries to just do a ioremap of this mailbox memory region if
it finds it busy.

Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:23 +05:30
Sudeep Holla
baef9a35d2 mailbox: mailbox-test: add support for fasync/poll
Currently the read operation on the message debug file returns error if
there's no data ready to be read. It expects the userspace to retry if
it fails. Since the mailbox response could be asynchronous, it would be
good to add support to block the read until the data is available.

We can also implement poll file operations so that the userspace can
wait to become ready to perform any I/O.

This patch implements the poll and fasync file operation callback for
the test mailbox device.

Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:23 +05:30
Rob Rice
cf17581340 mailbox: bcm-pdc: Remove unnecessary void* casts
Remove unnecessary void* casts in register writes. Fix two other
minor formatting issues.

Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Reviewed-by: Jon Mason <jon.mason@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:23 +05:30
Rob Rice
30d1ef623f mailbox: bcm-pdc: Simplify interrupt handler logic
Earlier versions of the PDC driver registered for both
transmit and receive interrupts. The hard IRQ handler had to
communicate to the soft handler which interrupt(s) had occurred.
The PDC driver no longer registers for tx interrupts. So there is
no reason to save the intstatus. So remove the intstatus member
of the PDC state.

Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:22 +05:30
Rob Rice
63bb50bdb9 mailbox: bcm-pdc: Performance improvements
Three changes to improve performance in the PDC driver:
- disable and reenable interrupts while the interrupt handler is
running
- update rxin and txin descriptor indexes more efficiently
- group receive descriptor context into a structure and keep
context in a single array rather than five to improve locality
of reference

Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:22 +05:30
Rob Rice
38ed49ed4a mailbox: bcm-pdc: Don't use iowrite32 to write DMA descriptors
In PDC driver, it is not necessary to use iowrite32()
when writing DMA descriptors to the transmit and receive rings.
The ring memory is in host memory. So convert to normal
assignment statements.

Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:21 +05:30
Rob Rice
8aef00f090 mailbox: bcm-pdc: Convert from threaded IRQ to tasklet
Previously used threaded IRQs in the PDC driver to defer
processing the rx DMA ring after getting an rx done interrupt.
Instead, use a tasklet at normal priority for deferred processing.

Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:21 +05:30
Rob Rice
7493cde34e mailbox: bcm-pdc: Try to improve branch prediction
Use likely/unlikely directives to improve branch prediction.

Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:20 +05:30
Rob Rice
e004c7e7d3 mailbox: bcm-pdc: streamline rx code
Remove the unnecessary rmb() from the receive path.

If the rx ring has multiple messages ready, avoid reading
last_rx_curr multiple times from the register.

Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:20 +05:30
Rob Rice
ab8d1b2d56 mailbox: bcm-pdc: Convert from interrupts to poll for tx done
The PDC driver is a mailbox controller. A mailbox controller
can report that a mailbox message has been "transmitted" either when
a tx interrupt fires or by having the mailbox framework poll. This
commit converts the PDC driver to the poll method. We found that the
tx interrupt happens when the descriptors are read by the SPU hw. Thus,
the interrupt method does not allow more than one tx message in the PDC
tx DMA ring at a time. To keep the SPU hw busy, we would like to keep
the tx ring full under heavy load.

With the poll method, the PDC driver responds that the previous message
has been transmitted if the tx ring has space for another message.
SPU request messages take a variable number of descriptors. If 15
descriptors are available, there is a good chance another message will
fit. Also increased the ring size from 128 to 512 descriptors.

With this change, I found the PDC driver hangs on its spinlock under
heavy load. The PDC spinlock is not required; so I removed it. Calls
to pdc_send_data() are already synchronized because of the channel
spinlock in the mailbox framework. Other references to ring indexes
should not require locking because they only written on either the
tx or rx side.

Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:19 +05:30
Steve Lin
9310f1ded4 mailbox: bcm-pdc: PDC driver leaves debugfs files after removal
Minor fix to ensure that debugfs stats pseudo-files are
removed when driver module is unloaded.  Previously, the call to
debugfs_remove_recursive() was never being called since the
directory was not empty, and a seg fault would occur if another
process tried to access these leftover files.

Signed-off-by: Steve Lin <steven.lin1@broadcom.com>
Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:19 +05:30
Steve Lin
9fb0f9ac54 mailbox: bcm-pdc: Changes so mbox client can be removed / re-inserted
Ensure that DMA is disabled, and pointers reset, when changing
DMA base addresses in pdc_ring_init().  This allows a mailbox client
to be re-inserted after being removed.  Otherwise, the DMA doesn't
restart so the client hangs while being reinserted.

Signed-off-by: Steve Lin <steven.lin1@broadcom.com>
Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:18 +05:30
Rob Rice
9b1b2b3adb mailbox: bcm-pdc: Use octal permissions rather than symbolic
When creating the debugfs files for the PDC driver, use
octal file permissions rather than symbolic file permissions.

Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:18 +05:30
Javier Martinez Canillas
2f50497d71 mailbox: sti: Fix module autoload for OF registration
If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/mailbox/mailbox-sti.ko | grep alias
alias:          platform:mailbox-sti

After this patch:

$ modinfo drivers/mailbox/mailbox-sti.ko | grep alias
alias:          platform:mailbox-sti
alias:          of:N*T*Cst,stih407-mailboxC*
alias:          of:N*T*Cst,stih407-mailbox

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:18 +05:30
Javier Martinez Canillas
f42cce3c24 mailbox: mailbox-test: Fix module autoload
If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/mailbox/mailbox-test.ko | grep alias
$

After this patch:

$ modinfo drivers/mailbox/mailbox-test.ko | grep alias
alias:          of:N*T*Cmailbox-testC*
alias:          of:N*T*Cmailbox-test

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-12-19 20:10:17 +05:30
Linus Torvalds
991688bfc6 ARM: SoC driver updates for v4.10
Driver updates for ARM SoCs, including a couple of newly added drivers:
 
 - A new driver for the power management controller on TI Keystone
 - Support for the prerelease "SCPI" firmware protocol that ended up
   being shipped by Amlogic in their GXBB SoC.
 - A soc_device can now be matched using a glob from inside the
   kernel, when another driver wants to know the specific chip
   it is running on and cannot find out from DT, firmware or hardware.
 - Renesas SoCs now support identification through the soc_device
   interface, both in user space and kernel.
 - Renesas r8a7743 and r8a7745 gain support for their system controller
 - A new checking module for the ARM "PSCI" (not to be confused
   with "SCPI" mentioned above) firmware interface.
 - A new driver for the Tegra GMI memory interface
 - Support for the Tegra firmware interfaces with their
   power management controllers
 
 As usual, the updates for the reset controller framework are merged
 here, as they tend to touch multiple SoCs as well, including a new
 driver for the Oxford (now Broadcom) OX820 chip and the Tegra
 bpmp interface.
 
 The existing drivers for Atmel, Qualcomm, NVIDIA, TI Davinci, and
 Rockchips SoCs see some further updates.
 
 Conflicts:
 - ARCH_RENESAS now selects SOC_BUS, but no longer needs GPIOLIB
 - drivers/soc/renesas/Makefile: multiple files got added, keep
   all in logical sorting
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Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC driver updates from Arnd Bergmann:
 "Driver updates for ARM SoCs, including a couple of newly added
  drivers:

   - A new driver for the power management controller on TI Keystone

   - Support for the prerelease "SCPI" firmware protocol that ended up
     being shipped by Amlogic in their GXBB SoC.

   - A soc_device can now be matched using a glob from inside the
     kernel, when another driver wants to know the specific chip it is
     running on and cannot find out from DT, firmware or hardware.

   - Renesas SoCs now support identification through the soc_device
     interface, both in user space and kernel.

   - Renesas r8a7743 and r8a7745 gain support for their system
     controller

   - A new checking module for the ARM "PSCI" (not to be confused with
     "SCPI" mentioned above) firmware interface.

   - A new driver for the Tegra GMI memory interface

   - Support for the Tegra firmware interfaces with their power
     management controllers

  As usual, the updates for the reset controller framework are merged
  here, as they tend to touch multiple SoCs as well, including a new
  driver for the Oxford (now Broadcom) OX820 chip and the Tegra bpmp
  interface.

  The existing drivers for Atmel, Qualcomm, NVIDIA, TI Davinci, and
  Rockchips SoCs see some further updates"

* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (76 commits)
  misc: sram: remove useless #ifdef
  drivers: psci: Allow PSCI node to be disabled
  drivers: psci: PSCI checker module
  soc: renesas: Identify SoC and register with the SoC bus
  firmware: qcom: scm: Return PTR_ERR when devm_clk_get fails
  firmware: qcom: scm: Remove core, iface and bus clocks dependency
  dt-bindings: firmware: scm: Add MSM8996 DT bindings
  memory: da8xx-ddrctl: drop the call to of_flat_dt_get_machine_name()
  bus: da8xx-mstpri: drop the call to of_flat_dt_get_machine_name()
  ARM: shmobile: Document DT bindings for Product Register
  soc: renesas: rcar-sysc: add R8A7745 support
  reset: Add Tegra BPMP reset driver
  dt-bindings: firmware: Allow child nodes inside the Tegra BPMP
  dt-bindings: Add power domains to Tegra BPMP firmware
  firmware: tegra: Add BPMP support
  firmware: tegra: Add IVC library
  dt-bindings: firmware: Add bindings for Tegra BPMP
  mailbox: tegra-hsp: Use after free in tegra_hsp_remove_doorbells()
  mailbox: Add Tegra HSP driver
  firmware: arm_scpi: add support for pre-v1.0 SCPI compatible
  ...
2016-12-15 16:03:25 -08:00
Dan Carpenter
68050eb6c6 mailbox: tegra-hsp: Use after free in tegra_hsp_remove_doorbells()
We have to use the _safe version of list_for_each() because we're
freeing the pointer as we go along.  (This might not show up testing
depending on what config options you have enabled).

Fixes: 0fe88461a0 ("mailbox: Add Tegra HSP driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
2016-11-18 14:32:13 +01:00
Thierry Reding
0fe88461a0 mailbox: Add Tegra HSP driver
This driver exposes a mailbox interface for interprocessor communication
using the Hardware Synchronization Primitives (HSP) module's doorbell
mechanism. There are multiple HSP instances and they provide additional
features such as shared mailboxes, shared and arbitrated semaphores.

A driver for a remote processor can use the mailbox client provided by
the HSP driver and build an IPC protocol on top of this synchronization
mechanism.

Based on work by Joseph Lo <josephl@nvidia.com>.

Acked-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
2016-11-18 14:26:13 +01:00
Hoan Tran
6ca595a70b mailbox: PCC: Fix lockdep warning when request PCC channel
This patch fixes the lockdep warning below

DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags))
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1 at linux-next/kernel/locking/lockdep.c:2876 lockdep_trace_alloc+0xe0/0xf0
 Modules linked in:

 CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.8.0-11756-g86c5152 #46
...
 Call trace:
 Exception stack(0xffff8007da837890 to 0xffff8007da8379c0)
 7880:                                   ffff8007da834000 0001000000000000
 78a0: ffff8007da837a70 ffff0000081111a0 00000000600000c5 000000000000003d
 78c0: 9374bc6a7f3c7832 0000000000381878 ffff000009db7ab8 000000000000002f
 78e0: ffff00000811aabc ffff000008be2548 ffff8007da837990 ffff00000811adf8
 7900: ffff8007da834000 00000000024080c0 00000000000000c0 ffff000009021000
 7920: 0000000000000000 0000000000000000 ffff000008c8f7c8 ffff8007da579810
 7940: 000000000000002f ffff8007da858000 0000000000000000 0000000000000001
 7960: 0000000000000001 0000000000000000 ffff00000811a468 0000000000000002
 7980: 656c62617369645f 0000000000038187 00000000000000ee ffff8007da837850
 79a0: ffff000009db50c0 ffff000009db569d 0000000000000006 ffff000089db568f
 [<ffff0000081111a0>] lockdep_trace_alloc+0xe0/0xf0
 [<ffff0000081f4950>] __kmalloc_track_caller+0x50/0x250
 [<ffff00000857c088>] devres_alloc_node+0x28/0x60
 [<ffff0000081220e0>] devm_request_threaded_irq+0x50/0xe0
 [<ffff0000087e6220>] pcc_mbox_request_channel+0x110/0x170
 [<ffff0000084b2660>] acpi_cppc_processor_probe+0x264/0x414
 [<ffff0000084ae9f4>] __acpi_processor_start+0x28/0xa0
 [<ffff0000084aeab0>] acpi_processor_start+0x44/0x54
 [<ffff00000857897c>] driver_probe_device+0x1fc/0x2b0
 [<ffff000008578ae4>] __driver_attach+0xb4/0xc0
 [<ffff00000857683c>] bus_for_each_dev+0x5c/0xa0
 [<ffff000008578110>] driver_attach+0x20/0x30
 [<ffff000008577c20>] bus_add_driver+0x110/0x230
 [<ffff000008579320>] driver_register+0x60/0x100
 [<ffff000008d478b8>] acpi_processor_driver_init+0x2c/0xb0
 [<ffff000008083168>] do_one_initcall+0x38/0x130
 [<ffff000008d20d6c>] kernel_init_freeable+0x210/0x2b4
 [<ffff000008945d90>] kernel_init+0x10/0x110
 [<ffff000008082e80>] ret_from_fork+0x10/0x50

It's because the spinlock inside pcc_mbox_request_channel() is
kept too long. This patch releases spinlock before request_irq()
and free_irq() to fix this issue  as spinlock is only needed to
protect the channel data.

Signed-off-by: Hoan Tran <hotran@apm.com>
Reviewed-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-11-14 22:07:38 +01:00
Linus Torvalds
c6594fc6af Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox updates from Jussi Brar:
 "New driver and DT bindings for MHU controller integrated on Amlogic
  Meson platform"

* 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  dt-bindings: mailbox: Add Amlogic Meson MHU Bindings
  mailbox: Add Platform Message-Handling-Unit variant driver
2016-10-06 17:36:53 -07:00
Rafael J. Wysocki
0d573c6a01 Merge branches 'acpi-x86', 'acpi-cppc' and 'acpi-soc'
* acpi-x86:
  x86: ACPI: make variable names clearer in acpi_parse_madt_lapic_entries()
  x86: ACPI: remove extraneous white space after semicolon

* acpi-cppc:
  ACPI / CPPC: Support PCC with interrupt flag
  ACPI / CPPC: Add prefix cppc to cpudata structure name
  ACPI / CPPC: Add support for functional fixed hardware address
  ACPI / CPPC: Don't return on CPPC probe failure
  ACPI / CPPC: Allow build with ACPI_CPU_FREQ_PSS config
  ACPI / CPPC: check for error bit in PCC status field
  ACPI / CPPC: move all PCC related information into pcc_data
  ACPI / CPPC: add sysfs support to compute delivered performance
  ACPI / CPPC: set a non-zero value for transition_latency
  ACPI / CPPC: support for batching CPPC requests
  ACPI / CPPC: acquire pcc_lock only while accessing PCC subspace
  ACPI / CPPC: restructure read/writes for efficient sys mapped reg ops
  mailbox: pcc: Support HW-Reduced Communication Subspace type 2

* acpi-soc:
  ACPI / APD: constify local structures
  ACPI / APD: Add device HID for Vulcan SPI controller
2016-10-02 01:39:09 +02:00
Neil Armstrong
ad3a212c1d mailbox: Add Platform Message-Handling-Unit variant driver
Add Message-Handling-Unit driver for platform variants as mailbox controller.
Actually, only the Amlogic Meson GXBB SoC MHU is supported.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-09-07 13:07:17 +05:30
hotran
aca314efb1 mailbox: pcc: Support HW-Reduced Communication Subspace type 2
ACPI 6.1 has a PCC HW-Reduced Communication Subspace type 2 intended for
use on HW-Reduce ACPI Platform, which requires read-modify-write sequence
to acknowledge doorbell interrupt. This patch provides the implementation
for the Communication Subspace Type 2.

Signed-off-by: Hoan Tran <hotran@apm.com>
Reviewed-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-08-31 00:37:20 +02:00
Baoyou Xie
a75e4a85f4 fix📫bcm-pdc-mailbox:mark symbols static where possible
We get 2 warnings when biuld kernel with W=1:
drivers/mailbox/bcm-pdc-mailbox.c:472:6: warning: no previous prototype for 'pdc_setup_debugfs' [-Wmissing-prototypes]
drivers/mailbox/bcm-pdc-mailbox.c:488:6: warning: no previous prototype for 'pdc_free_debugfs' [-Wmissing-prototypes]

In fact, these functions are only used in the file in which they are
declared and don't need a declaration, but can be made static.
so this patch marks these functions with 'static'.

Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-08-29 18:43:39 +05:30
Dan Carpenter
068cf29eca mailbox: bcm-pdc: potential NULL dereference in pdc_shutdown()
We can't pass NULL pointers to pdc_ring_free() so I moved the check for
NULL.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-08-29 18:41:15 +05:30
Rob Rice
e0c6fba45a mailbox: Add HAS_DMA Kconfig dependency to BCM_PDC_MBOX
Add HAS_DMA Kconfig dependency to BCM_PDC_MBOX to avoid link
error on some platforms.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Rob Rice <rrice@broadcom.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-08-29 18:39:46 +05:30
Rob Rice
a68b216676 mailbox: Fix format and type mismatches in Broadcom PDC driver
Fix format and type mismatches in a couple debug prints in the
Broadcom PDC driver. Use %pad for dma_addr_t and %pa for
resource_size_t.

Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-07-28 21:27:31 +05:30
Rob Rice
a24532f8d1 mailbox: Add Broadcom PDC mailbox driver
The Broadcom PDC mailbox driver is a mailbox controller that
manages data transfers to and from one or more offload engines.

Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-07-28 09:34:47 +05:30
Ben Dooks
9ac3e85a5c mailbox: pl320: remove __raw IO
The use of __raw IO accesors is not endian safe and should be used
sparingly. The relaxed variants should be as lightweight and also
are endian safe.

Note, this has not been run-time tested.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-06-24 13:32:31 +05:30
Sudeep Holla
9ef3c51121 mailbox: mailbox-test: set tdev->signal to NULL after freeing
tdev->signal is not set NULL after it's freed. This will cause random
exceptions when the stale pointer is accessed after tdev->signal is
freed. Also, since tdev->signal allocation is skipped the next time
it's written, this leads to continuous fault finally leading to the
total death of the system.

Fixes: d1c2f87c9a ("mailbox: mailbox-test: Prevent memory leak")
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-06-12 15:13:04 +05:30
Amitoj Kaur Chawla
c430cf376f mailbox: Fix devm_ioremap_resource error detection code
devm_ioremap_resource returns an ERR_PTR value, not NULL,
on failure.

The Coccinelle semantic patch used to make this change is
as follows:
@@
expression e,e1;
statement S;
@@

*e = devm_ioremap_resource(...);
if (!e1) S

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-05-08 22:44:46 +05:30
Suman Anna
dd28216528 mailbox/omap: kill omap_mbox_{save/restore}_ctx() functions
The omap_mbox_save_ctx() and omap_mbox_restore_ctx() API were
previously provided to OMAP mailbox clients to save and restore
the mailbox context during system suspend/resume. The save and
restore functionality is now implemented through System PM driver
callbacks, and there is no need for these functions, so kill these
API.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26 10:19:38 +05:30
Suman Anna
9f0cee984a mailbox/omap: check for any unread messages during suspend
The OMAP mailbox driver is used by clients to communicate with remote
processors in general. The mailbox clients are expected to have stopped
communicating with these remote processors during a system suspend. The
OMAP mailbox fifos are expected to not have any messages as such. Add a
check for any pending unprocessed messages in the suspend callback, to
detect any communication protocol issues of the mailbox clients. The
system suspend is aborted if any messages are found.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26 10:19:38 +05:30
Suman Anna
af1d2f5cb9 mailbox/omap: add support for suspend/resume
Support has been added to the OMAP mailbox driver to allow it
to work across a system suspend/resume. The OMAP mailbox driver
requires only the interrupt configuration registers to be saved
and restored, and this is done in the suspend/resume callbacks.
The registers need to be saved only if there are active clients
at the time of suspend. The enabling and disabling of the mailbox
clocks is done automatically by the omap_device layer.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26 10:19:38 +05:30
Suman Anna
2240f8aefc mailbox/omap: store mailbox interrupt type in omap_mbox_device
The interrupt type used for identifying the layout of the interrupt
configuration registers between OMAP4+ SoCs and older SoCs is stored
only in the sub-mailbox structures for easier access. Store this type
in the the omap_mbox_device structure as well along with the other
global variables. This is being done to facilitate the context save
and restore of appropriate registers during system suspend/resume.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26 10:19:38 +05:30
Suman Anna
2665a4c1d4 mailbox/omap: add blank lines after declarations
Fix couple of checkpatch warnings of the type,
"WARNING: Missing a blank line after declarations"

Also, fixed a warning about a space after a typecast
while at this.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26 10:19:37 +05:30
Suman Anna
0196fa3945 mailbox/omap: remove FSF mailing address paragraph
Remove the paragraph about writing to the Free Software
Foundation's mailing address from the GPL license header
as this address can change. This fixes the corresponding
checkpatch warning.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26 10:19:37 +05:30
Suman Anna
86f6f5e2e2 mailbox/omap: use variable name for sizeof() operator
Fix the code formatting to use the kernel preferred style
of using the actual variables to determize the size using
the sizeof() operator. This fixes the corresponding checkpatch
warning as well.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26 10:19:37 +05:30
Suman Anna
4899f78a3d mailbox/omap: drop legacy platform device support
OMAP mailbox devices can no longer be created in legacy non-DT
mode, all the relevant code has been cleaned up. The OMAP mailbox
driver will only support devices created from DT going forward,
so drop the legacy platform device support from the driver.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-26 10:19:37 +05:30
Linus Torvalds
a7109a2ca7 Merge branch 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox fixes from Jussi Brar:
 "Misc fixes:

  mailbox-test driver:
   - prevent memory leak and another cosmetic change

  mailbox:
   - change the returned error code

  Xgene driver:
   - return -ENOMEM instead of PTR_ERR for failed devm_kzalloc"

* 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox: Stop using ENOSYS for anything other than unimplemented syscalls
  mailbox: mailbox-test: Prevent memory leak
  mailbox: mailbox-test: Use more consistent format for calling copy_from_user()
  mailbox: xgene-slimpro: Fix wrong test for devm_kzalloc
2016-04-14 18:40:47 -07:00
Lee Jones
0c44d7896c mailbox: Stop using ENOSYS for anything other than unimplemented syscalls
In accordance with e15f431fe2 ("errno.h: Improve ENOSYS's comment") and
91c9afaf97 ("checkpatch.pl: new instances of ENOSYS are errors") we're
converting from the old meaning of: ENOSYS "Function not implemented" to
a more standard EINVAL.

Reported-by: Seraphin Bonnaffe <seraphin.bonnaffe@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-12 13:28:32 +05:30
Lee Jones
d1c2f87c9a mailbox: mailbox-test: Prevent memory leak
If we set the Signal twice or more, without using it as part of a message,
memory will be re-allocated and the pointer over-written.  Prevent this
potential leak by only allocating memory when there isn't any already.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-12 13:28:30 +05:30
Lee Jones
17f5f28ffa mailbox: mailbox-test: Use more consistent format for calling copy_from_user()
While we're at it, ensure copy-to location is NULL'ed in the error path.

Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-12 13:28:20 +05:30
Rafael J. Wysocki
fa81e66ec8 Merge branches 'pm-cpufreq', 'pm-cpuidle' and 'acpi-cppc'
* pm-cpufreq:
  cpufreq: dt: Drop stale comment
  cpufreq: intel_pstate: Documenation for structures
  cpufreq: intel_pstate: fix inconsistency in setting policy limits
  intel_pstate: Avoid extra invocation of intel_pstate_sample()
  intel_pstate: Do not set utilization update hook too early

* pm-cpuidle:
  intel_idle: Add KBL support
  intel_idle: Add SKX support
  intel_idle: Clean up all registered devices on exit.
  intel_idle: Propagate hot plug errors.
  intel_idle: Don't overreact to a cpuidle registration failure.
  intel_idle: Setup the timer broadcast only on successful driver load.
  intel_idle: Avoid a double free of the per-CPU data.
  intel_idle: Fix dangling registration on error path.
  intel_idle: Fix deallocation order on the driver exit path.
  intel_idle: Remove redundant initialization calls.
  intel_idle: Fix a helper function's return value.
  intel_idle: remove useless return from void function.

* acpi-cppc:
  mailbox: pcc: Don't access an unmapped memory address space
2016-04-08 21:46:05 +02:00
Axel Lin
a61b37ead5 mailbox: xgene-slimpro: Fix wrong test for devm_kzalloc
devm_kzalloc() returns NULL on failure.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-04-08 09:30:11 +05:30
Shanker Donthineni
169b38373f mailbox: pcc: Don't access an unmapped memory address space
The acpi_pcc_probe() may end up accessing memory outside of the PCCT
table space causing the kernel panic(). Increment the pcct_entry
pointer after parsing 'HW-reduced Communications Subspace' to fix
the problem. This change also enables the parsing of subtable at
index 0.

Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-04-07 01:25:28 +02:00
Linus Torvalds
988faa7312 Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull more mailbox updates from Jassi Brar:
 "Device tree bindings and driver for TI's Message-Manager controller.

  Due to some last minute cosmetic changes, the driver was not included
  in the first pull request, otherwise the driver has been reviewed
  twice"

* 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox: Introduce TI message manager driver
  Documentation: dt: mailbox: Add TI Message Manager
2016-03-23 06:09:15 -07:00
Nishanth Menon
aace66b170 mailbox: Introduce TI message manager driver
Support for TI Message Manager Module. This hardware block manages a
bunch of hardware queues meant for communication between processor
entities.

Clients sitting on top of this would manage the required protocol
for communicating with the counterpart entities.

For more details on TI Message Manager hardware block, see documentation
that will is available here: http://www.ti.com/lit/ug/spruhy8/spruhy8.pdf
Chapter 8.1(Message Manager)

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-21 20:33:15 +05:30
Linus Torvalds
2b2f72d8ce Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox updates from Jassi Brar:

 - mailbox bindings and drivers for
     * APM X-Gene
     * Hisilicon Hi6220
     * Rockchip RK3368
   platforms

 - minor fixes to the above three drivers.

 - misc cleanups of mailbox-test driver.

* 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox: rockchip: avoid 64-bit division
  mailbox: rockchip: Add Rockchip mailbox driver
  dt-bindings: rockchip-mailbox: Add mailbox controller document on Rockchip SoCs
  mailbox/xgene-slimpro: Checking for IS_ERR instead of NULL
  mailbox: Hi6220: add mailbox driver
  dt-bindings: mailbox: Document Hi6220 mailbox driver
  mailbox: mailbox-test: add support for separate tx/rx buffer with single channel
  mailbox: mailbox-test: use print_hex_dump_bytes to allow dynamic printk
  mailbox: mailbox-test: fix the compatible string
  mailbox: mailbox-test: rename driver as generic test driver
  Documentation: mailbox: Add APM X-Gene SLIMpro mailbox dts documentation
  mailbox: Add support for APM X-Gene platform mailbox driver
2016-03-20 12:58:32 -07:00
Arnd Bergmann
c5a9d1f30c mailbox: rockchip: avoid 64-bit division
The newly added rockchip mailbox driver causes a bug in
the ARM allyesconfig build because of a division of a resource_size_t
variable that may be 64 bit wide:

drivers/mailbox/built-in.o: In function `rockchip_mbox_probe':
:(.text+0x6614): undefined reference to `__aeabi_uldivmod'

This adds a cast to size_t, which turns it into a 32-bit division
in this case. This is safe because we know that we cannot possibly
map a resource that is longer than what a pointer contains, and
in practice it will be very short instead.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-16 09:18:15 +05:30
Rafael J. Wysocki
6a8ccb1dfd Merge branches 'acpi-processor' and 'acpi-cppc'
* acpi-processor:
  ACPI / sleep: move acpi_processor_sleep to sleep.c
  ACPI / processor : add support for ACPI0010 processor container
  ACPI / processor_idle: replace PREFIX with pr_fmt

* acpi-cppc:
  ACPI / CPPC: use MRTT/MPAR to decide if/when a req can be sent
  ACPI / CPPC: replace writeX/readX to PCC with relaxed version
  mailbox: pcc: optimized pcc_send_data
  ACPI / CPPC: optimized cpc_read and cpc_write
  ACPI / CPPC: Optimize PCC Read Write operations
2016-03-14 14:20:33 +01:00
Caesar Wang
f70ed3b5dc mailbox: rockchip: Add Rockchip mailbox driver
This driver is found on RK3368 SoCs.

The Mailbox module is a simple APB peripheral that allows both
the Cortex-A53 MCU system to communicate by writing operation to
generate interrupt.
The registers are accessible by both CPU via APB interface.

The Mailbox has the following main features:

1) Support dual-core system: Cortex-A53 and MCU.
2) Support APB interface.
3) Support four mailbox elements, each element includes one data word,
   one command word register and one flag bit that can represent
   one interrupt.
4) Four interrupts to Cortex-A53.
5) Four interrupts to MCU.
6) Provide 32 lock registers for software to use to indicate whether
   mailbox is occupied.

[Jassi: Removed unused variable buf_base]

Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-11 10:40:06 +07:00
Prakash, Prashanth
8b0f578898 mailbox: pcc: optimized pcc_send_data
pcc_send_data() can be invoked during the execution of performance
critical code as in cppc_cpufreq driver. With acpi_* APIs, the
doorbell register accessed in pcc_send_data() if present in system
memory will be searched (in cached virt to phys addr mapping),
mapped, read/written and then unmapped. These operations take
significant amount of time.

This patch maps the performance critical doorbell register
during init and then reads/writes to it directly using the
mapped virtual address. This patch + similar changes to CPPC
acpi driver reduce the time per freq. transition from around
200us to about 20us for the CPPC cpufreq driver

Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org>
Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-03-09 23:35:29 +01:00
Dan Carpenter
14d653af4e mailbox/xgene-slimpro: Checking for IS_ERR instead of NULL
devm_ioremap() returns NULL, it never returns an ERR_PTR.

Fixes: f700e84f41 ('mailbox: Add support for APM X-Gene platform mailbox driver')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-04 12:32:20 +05:30
Leo Yan
9c384189f5 mailbox: Hi6220: add mailbox driver
Add driver for Hi6220 mailbox, the mailbox communicates with MCU; for
sending data, it can support two methods for low level implementation:
one is to use interrupt as acknowledge, another is automatic mode which
without any acknowledge. These two methods have been supported in the
driver. For receiving data, it will depend on the interrupt to notify
the channel has incoming message.

Now mailbox driver is used to send message to MCU to control dynamic
voltage and frequency scaling for CPU, GPU and DDR.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-04 12:32:20 +05:30
Sudeep Holla
2d74ffdc91 mailbox: mailbox-test: add support for separate tx/rx buffer with single channel
This patch adds support for different MMIO region for Tx and Rx paths.
If only one region is specified, it's assumed to be shared between Rx
and Tx, thereby retaining backward compatibility.

Also in order to support single channel dealing with both Tx and Rx with
dedicated MMIO regions, Tx channel itself is assigned to Rx if MMIO
regions are different and Rx is not specified.

Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-04 12:32:19 +05:30
Sudeep Holla
27fa680f7f mailbox: mailbox-test: use print_hex_dump_bytes to allow dynamic printk
Reduce the logging from info to debug. Also use print_hex_dump_bytes
instead as it has support for dynamic printk providing options to
conditionally enable/disable these logs.

Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-04 12:32:19 +05:30
Sudeep Holla
c428013783 mailbox: mailbox-test: fix the compatible string
Underscores are usually forbidden in the compatible strings. So lets
remove it before the first users of this is seen.

Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-04 12:32:18 +05:30
Sudeep Holla
adf06ba9b3 mailbox: mailbox-test: rename driver as generic test driver
This mailbox-test driver was designed to be generic, so let's remove ST
tag on it and make it generic.

Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-03-04 12:32:13 +05:30
Duc Dang
f700e84f41 mailbox: Add support for APM X-Gene platform mailbox driver
X-Gene mailbox controller provides 8 mailbox channels, with
each channel has a dedicated interrupt line.

Signed-off-by: Feng Kan <fkan@apm.com>
Signed-off-by: Duc Dang <dhdang@apm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-02-15 13:20:03 +05:30
Richard Weinberger
65d3b04a81 mailbox: Fix dependencies for !HAS_IOMEM archs
Not every arch has io memory.
So, unbreak the build by fixing the dependencies.

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-02-02 16:47:14 +05:30
Alexey Klimov
e9c8dc8ba9 mailbox: pcc: fix channel calculation in get_pcc_channel()
This patch fixes the calculation of pcc_chan for non-zero id.
After the compiler ignores the (unsigned long) cast the
pcc_mbox_channels pointer is type-cast and then the type-cast
offset is added which results in address outside of the range
leading to the kernel crashing.

We might add braces and make it:

pcc_chan = (struct mbox_chan *)
		((unsigned long) pcc_mbox_channels +
		(id * sizeof(*pcc_chan)));

but let's go with array approach here and use id as index.

Tested on Juno board.

Signed-off-by: Alexey Klimov <alexey.klimov@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2016-02-02 16:39:13 +05:30
Julia Lawall
bfbcfa770b mailbox: constify mbox_chan_ops structure
This mbox_chan_ops structure is never modified, so declare it as const,
like all the other mbox_chan_ops structures.

Done with the help of Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-11-30 21:12:05 +05:30
Jassi Brar
cb1ca0b3bb mailbox: mailbox-test: avoid reading iomem twice
Don't pass mmio region as source to print_hex_dump() and then
again to memcpy_fromio(). Do it once and give print_hex_dump()
the buffer we just read the data in.

Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-11-04 14:03:04 +05:30
Dan Carpenter
c3ac54a6f5 mailbox: Off by one in mbox_test_message_read()
We need to leave space for the NUL char.

Fixes: 8ea4484d0c ('mailbox: Add generic mechanism for testing Mailbox Controllers')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
2015-10-27 21:27:25 +05:30
Dave Gerlach
8e3c595214 mailbox/omap: Add ti,mbox-send-noirq quirk to fix AM33xx CPU Idle
The mailbox framework controls the transmission queue and requires
either its controller implementations or clients to run the state
machine for the Tx queue. The OMAP mailbox controller uses a Tx-ready
interrupt as the equivalent of a Tx-done interrupt to run this Tx
queue state-machine.

The WkupM3 processor on AM33xx and AM43xx SoCs is used to offload
certain PM tasks, like doing the necessary operations for Device
PM suspend/resume or for entering lower c-states during cpuidle.

The CPUIdle on AM33xx requires the messages to be sent without
having to trigger the Tx-ready interrupts, as the interrupt
would immediately terminate the CPUIdle operation. Support for
this has been added by introducing a DT quirk, "ti,mbox-send-noirq"
and using it to modify the normal OMAP mailbox controller behavior
on the sub-mailboxes used to communicate with the WkupM3 remote
processor. This also requires the wkup_m3_ipc driver to adjust
its mailbox usage logic to run the Tx state machine.

NOTE:
- AM43xx does not communicate with WkupM3 for CPU Idle, so is
  not affected by this behavior. But, it uses the same IPC driver
  for PM suspend/resume functionality, so requires the quirk as
  well, because of changes to the common wkup_m3_ipc driver.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
[s-anna@ti.com: revise logic and update comments/patch description]
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-10-23 11:19:27 +05:30
Lee Jones
a133f8b65d mailbox: mailbox-test: Correctly repair Sparse warnings
Kbuild test robot reported some Sparse warnings to the tune of:

  sparse: incorrect type in argument 6 (different address spaces)
    expected void const *buf
    got void [noderef] <asn:2>*mmio

This was due to passing variables tagged with the Sparse cookie
'__iomem' through into memcpy() and print_hex_dump() without
adequate protection or casting.  These issues were fixed in a
previous patch suppressing the warnings, but the issue is indeed
still present.

This patch fixes the warnings in the correct way, i.e. by using
the purposely authored memcpy_{from,to}io() derivatives in the
memcpy() case and casting the memory address to (void *) and
forcing Sparse to ignore to ignore it in the print_hex_dump()
case [NB: This is also what the memcpy() derivatives do].

Reported-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-10-23 11:19:21 +05:30
Lee Jones
6c03663f98 mailbox: Fix a couple of trivial static checker issues
This patch deals with a few spelling, white space and type
warnings reported by Intel's Kbuild Test Robot.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-10-17 10:36:56 +05:30
Lee Jones
8ea4484d0c mailbox: Add generic mechanism for testing Mailbox Controllers
This particular Client implementation uses shared memory in order
to pass messages between Mailbox users; however, it can be easily
hacked to support any type of Controller.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-10-17 10:36:56 +05:30
Lee Jones
9ef4546cbd mailbox: Add support for ST's Mailbox IP
ST's platforms currently support a maximum of 5 Mailboxes, one for
each of the supported co-processors situated on the platform.  Each
Mailbox is divided up into 4 instances which consist of 32 channels.
Messages are passed between the application and co-processors using
shared memory areas.  It is the Client's responsibility to manage
these areas.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-10-17 10:36:56 +05:30
Sudip Mukherjee
d311a28a58 PCC: fix dereference of ERR_PTR
get_pcc_channel() does not return NULL on error it returns the error code
in ERR_PTR, but we have been checking it for NULL.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
2015-10-16 10:46:07 +05:30
Linus Torvalds
e3a98ac476 Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox updates from Jassi Brar:
 "Mainly we move from jiffy based timer to HRTIMER for finer control
  over polling.  Then a controller reduces its polling period from 10 to
  1ms"

* 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox: arm_mhu: reduce txpoll_period from 10ms to 1 ms
  mailbox: switch to hrtimer for tx_complete polling
  mailbox: Drop owner assignment from platform_driver
2015-09-05 18:11:04 -07:00
Linus Torvalds
ae98207309 Power management and ACPI material for v4.3-rc1
- ACPICA update to upstream revision 20150818 including method
    tracing extensions to allow more in-depth AML debugging in the
    kernel and a number of assorted fixes and cleanups (Bob Moore,
    Lv Zheng, Markus Elfring).
 
  - ACPI sysfs code updates and a documentation update related to
    AML method tracing (Lv Zheng).
 
  - ACPI EC driver fix related to serialized evaluations of _Qxx
    methods and ACPI tools updates allowing the EC userspace tool
    to be built from the kernel source (Lv Zheng).
 
  - ACPI processor driver updates preparing it for future
    introduction of CPPC support and ACPI PCC mailbox driver
    updates (Ashwin Chaugule).
 
  - ACPI interrupts enumeration fix for a regression related
    to the handling of IRQ attribute conflicts between MADT
    and the ACPI namespace (Jiang Liu).
 
  - Fixes related to ACPI device PM (Mika Westerberg, Srinidhi Kasagar).
 
  - ACPI device registration code reorganization to separate the
    sysfs-related code and bus type operations from the rest (Rafael
    J Wysocki).
 
  - Assorted cleanups in the ACPI core (Jarkko Nikula, Mathias Krause,
    Andy Shevchenko, Rafael J Wysocki, Nicolas Iooss).
 
  - ACPI cpufreq driver and ia64 cpufreq driver fixes and cleanups
    (Pan Xinhui, Rafael J Wysocki).
 
  - cpufreq core cleanups on top of the previous changes allowing it
    to preseve its sysfs directories over system suspend/resume (Viresh
    Kumar, Rafael J Wysocki, Sebastian Andrzej Siewior).
 
  - cpufreq fixes and cleanups related to governors (Viresh Kumar).
 
  - cpufreq updates (core and the cpufreq-dt driver) related to the
    turbo/boost mode support (Viresh Kumar, Bartlomiej Zolnierkiewicz).
 
  - New DT bindings for Operating Performance Points (OPP), support
    for them in the OPP framework and in the cpufreq-dt driver plus
    related OPP framework fixes and cleanups (Viresh Kumar).
 
  - cpufreq powernv driver updates (Shilpasri G Bhat).
 
  - New cpufreq driver for Mediatek MT8173 (Pi-Cheng Chen).
 
  - Assorted cpufreq driver (speedstep-lib, sfi, integrator) cleanups
    and fixes (Abhilash Jindal, Andrzej Hajda, Cristian Ardelean).
 
  - intel_pstate driver updates including Skylake-S support, support
    for enabling HW P-states per CPU and an additional vendor bypass
    list entry (Kristen Carlson Accardi, Chen Yu, Ethan Zhao).
 
  - cpuidle core fixes related to the handling of coupled idle states
    (Xunlei Pang).
 
  - intel_idle driver updates including Skylake Client support and
    support for freeze-mode-specific idle states (Len Brown).
 
  - Driver core updates related to power management (Andy Shevchenko,
    Rafael J Wysocki).
 
  - Generic power domains framework fixes and cleanups (Jon Hunter,
    Geert Uytterhoeven, Rajendra Nayak, Ulf Hansson).
 
  - Device PM QoS framework update to allow the latency tolerance
    setting to be exposed to user space via sysfs (Mika Westerberg).
 
  - devfreq support for PPMUv2 in Exynos5433 and a fix for an incorrect
    exynos-ppmu DT binding (Chanwoo Choi, Javier Martinez Canillas).
 
  - System sleep support updates (Alan Stern, Len Brown, SungEun Kim).
 
  - rockchip-io AVS support updates (Heiko Stuebner).
 
  - PM core clocks support fixup (Colin Ian King).
 
  - Power capping RAPL driver update including support for Skylake H/S
    and Broadwell-H (Radivoje Jovanovic, Seiichi Ikarashi).
 
  - Generic device properties framework fixes related to the handling
    of static (driver-provided) property sets (Andy Shevchenko).
 
  - turbostat and cpupower updates (Len Brown, Shilpasri G Bhat,
    Shreyas B Prabhu).
 
 /
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Merge tag 'pm+acpi-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management and ACPI updates from Rafael Wysocki:
 "From the number of commits perspective, the biggest items are ACPICA
  and cpufreq changes with the latter taking the lead (over 50 commits).

  On the cpufreq front, there are many cleanups and minor fixes in the
  core and governors, driver updates etc.  We also have a new cpufreq
  driver for Mediatek MT8173 chips.

  ACPICA mostly updates its debug infrastructure and adds a number of
  fixes and cleanups for a good measure.

  The Operating Performance Points (OPP) framework is updated with new
  DT bindings and support for them among other things.

  We have a few updates of the generic power domains framework and a
  reorganization of the ACPI device enumeration code and bus type
  operations.

  And a lot of fixes and cleanups all over.

  Included is one branch from the MFD tree as it contains some
  PM-related driver core and ACPI PM changes a few other commits are
  based on.

  Specifics:

   - ACPICA update to upstream revision 20150818 including method
     tracing extensions to allow more in-depth AML debugging in the
     kernel and a number of assorted fixes and cleanups (Bob Moore, Lv
     Zheng, Markus Elfring).

   - ACPI sysfs code updates and a documentation update related to AML
     method tracing (Lv Zheng).

   - ACPI EC driver fix related to serialized evaluations of _Qxx
     methods and ACPI tools updates allowing the EC userspace tool to be
     built from the kernel source (Lv Zheng).

   - ACPI processor driver updates preparing it for future introduction
     of CPPC support and ACPI PCC mailbox driver updates (Ashwin
     Chaugule).

   - ACPI interrupts enumeration fix for a regression related to the
     handling of IRQ attribute conflicts between MADT and the ACPI
     namespace (Jiang Liu).

   - Fixes related to ACPI device PM (Mika Westerberg, Srinidhi
     Kasagar).

   - ACPI device registration code reorganization to separate the
     sysfs-related code and bus type operations from the rest (Rafael J
     Wysocki).

   - Assorted cleanups in the ACPI core (Jarkko Nikula, Mathias Krause,
     Andy Shevchenko, Rafael J Wysocki, Nicolas Iooss).

   - ACPI cpufreq driver and ia64 cpufreq driver fixes and cleanups (Pan
     Xinhui, Rafael J Wysocki).

   - cpufreq core cleanups on top of the previous changes allowing it to
     preseve its sysfs directories over system suspend/resume (Viresh
     Kumar, Rafael J Wysocki, Sebastian Andrzej Siewior).

   - cpufreq fixes and cleanups related to governors (Viresh Kumar).

   - cpufreq updates (core and the cpufreq-dt driver) related to the
     turbo/boost mode support (Viresh Kumar, Bartlomiej Zolnierkiewicz).

   - New DT bindings for Operating Performance Points (OPP), support for
     them in the OPP framework and in the cpufreq-dt driver plus related
     OPP framework fixes and cleanups (Viresh Kumar).

   - cpufreq powernv driver updates (Shilpasri G Bhat).

   - New cpufreq driver for Mediatek MT8173 (Pi-Cheng Chen).

   - Assorted cpufreq driver (speedstep-lib, sfi, integrator) cleanups
     and fixes (Abhilash Jindal, Andrzej Hajda, Cristian Ardelean).

   - intel_pstate driver updates including Skylake-S support, support
     for enabling HW P-states per CPU and an additional vendor bypass
     list entry (Kristen Carlson Accardi, Chen Yu, Ethan Zhao).

   - cpuidle core fixes related to the handling of coupled idle states
     (Xunlei Pang).

   - intel_idle driver updates including Skylake Client support and
     support for freeze-mode-specific idle states (Len Brown).

   - Driver core updates related to power management (Andy Shevchenko,
     Rafael J Wysocki).

   - Generic power domains framework fixes and cleanups (Jon Hunter,
     Geert Uytterhoeven, Rajendra Nayak, Ulf Hansson).

   - Device PM QoS framework update to allow the latency tolerance
     setting to be exposed to user space via sysfs (Mika Westerberg).

   - devfreq support for PPMUv2 in Exynos5433 and a fix for an incorrect
     exynos-ppmu DT binding (Chanwoo Choi, Javier Martinez Canillas).

   - System sleep support updates (Alan Stern, Len Brown, SungEun Kim).

   - rockchip-io AVS support updates (Heiko Stuebner).

   - PM core clocks support fixup (Colin Ian King).

   - Power capping RAPL driver update including support for Skylake H/S
     and Broadwell-H (Radivoje Jovanovic, Seiichi Ikarashi).

   - Generic device properties framework fixes related to the handling
     of static (driver-provided) property sets (Andy Shevchenko).

   - turbostat and cpupower updates (Len Brown, Shilpasri G Bhat,
     Shreyas B Prabhu)"

* tag 'pm+acpi-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (180 commits)
  cpufreq: speedstep-lib: Use monotonic clock
  cpufreq: powernv: Increase the verbosity of OCC console messages
  cpufreq: sfi: use kmemdup rather than duplicating its implementation
  cpufreq: drop !cpufreq_driver check from cpufreq_parse_governor()
  cpufreq: rename cpufreq_real_policy as cpufreq_user_policy
  cpufreq: remove redundant 'policy' field from user_policy
  cpufreq: remove redundant 'governor' field from user_policy
  cpufreq: update user_policy.* on success
  cpufreq: use memcpy() to copy policy
  cpufreq: remove redundant CPUFREQ_INCOMPATIBLE notifier event
  cpufreq: mediatek: Add MT8173 cpufreq driver
  dt-bindings: mediatek: Add MT8173 CPU DVFS clock bindings
  PM / Domains: Fix typo in description of genpd_dev_pm_detach()
  PM / Domains: Remove unusable governor dummies
  PM / Domains: Make pm_genpd_init() available to modules
  PM / domains: Align column headers and data in pm_genpd_summary output
  powercap / RAPL: disable the 2nd power limit properly
  tools: cpupower: Fix error when running cpupower monitor
  PM / OPP: Drop unlikely before IS_ERR(_OR_NULL)
  PM / OPP: Fix static checker warning (broken 64bit big endian systems)
  ...
2015-09-01 19:45:46 -07:00
Ashwin Chaugule
b6fc6072b1 PCC: Disable compilation by default
PCC is made selectable only by clients which use it. e.g. CPPC
Default it to disabled so that it is not included accidentally on
platforms which dont use it.

Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Reviewed-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-08-26 02:17:39 +02:00
Ashwin Chaugule
d3c68f218f PCC: Initialize PCC Mailbox earlier at boot
This change initializes the PCC Mailbox earlier than
the ACPI processor driver. This enables drivers introduced
in follow up patches (e.g. CPPC) to be probed via the ACPI
processor driver interface. The CPPC probe requires the PCC
channel to be initialized for it to query each CPUs performance
capabilities.

Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Reviewed-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-08-25 03:25:46 +02:00
Sudeep Holla
86e488adaa mailbox: arm_mhu: reduce txpoll_period from 10ms to 1 ms
Since the mailbox core users hrtimers now, it can handle much higher
resolutions. We can reduce the txpoll_period to 1 ms as the transmit
usually takes just few microseconds.

Reported-and-suggested-by: Juri Lelli <Juri.Lelli@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-08-10 14:29:44 +05:30
Sudeep Holla
0cc67945ea mailbox: switch to hrtimer for tx_complete polling
The mailbox core uses jiffy based timer to handle polling for the
transmit completion. If the client/protocol have/support notification
of the last packet transmit completion via ACK packet, then we tick the
Tx state machine immediately in the callback. However if the client
doesn't support that mechanism we might end-up waiting for atleast a
jiffy even though the remote is ready to receive the next request.

This patch switches the timer used for that polling from jiffy-based
to hrtimer-based so that we can support polling at much higher time
resolution.

Reported-and-suggested-by: Juri Lelli <Juri.Lelli@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-08-10 14:29:27 +05:30
Masanari Iida
971bd8fa36 treewide: Fix typo in printk
This patch fix spelling typo inv various part of sources.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
2015-08-07 13:58:05 +02:00
Krzysztof Kozlowski
63d5e127de mailbox: Drop owner assignment from platform_driver
platform_driver does not need to set an owner because
platform_driver_register() will set it.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Lee Jones <lee@kernel.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-08-05 17:20:53 +05:30
Linus Torvalds
9d90f03531 Replace module_init with appropriate alternate initcall in non modules.
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Merge tag 'module_init-alternate_initcall-v4.1-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux

Pull module_init replacement part two from Paul Gortmaker:
 "Replace module_init with appropriate alternate initcall in non
  modules.

  This series converts non-modular code that is using the module_init()
  call to hook itself into the system to instead use one of our
  alternate priority initcalls.

  Unlike the previous series that used device_initcall and hence was a
  runtime no-op, these commits change to one of the alternate initcalls,
  because (a) we have them and (b) it seems like the right thing to do.

  For example, it would seem logical to use arch_initcall for arch
  specific setup code and fs_initcall for filesystem setup code.

  This does mean however, that changes in the init ordering will be
  taking place, and so there is a small risk that some kind of implicit
  init ordering issue may lie uncovered.  But I think it is still better
  to give these ones sensible priorities than to just assign them all to
  device_initcall in order to exactly preserve the old ordering.

  Thad said, we have already made similar changes in core kernel code in
  commit c96d6660dc ("kernel: audit/fix non-modular users of
  module_init in core code") without any regressions reported, so this
  type of change isn't without precedent.  It has also got the same
  local testing and linux-next coverage as all the other pull requests
  that I'm sending for this merge window have got.

  Once again, there is an unused module_exit function removal that shows
  up as an outlier upon casual inspection of the diffstat"

* tag 'module_init-alternate_initcall-v4.1-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux:
  x86: perf_event_intel_pt.c: use arch_initcall to hook in enabling
  x86: perf_event_intel_bts.c: use arch_initcall to hook in enabling
  mm/page_owner.c: use late_initcall to hook in enabling
  lib/list_sort: use late_initcall to hook in self tests
  arm: use subsys_initcall in non-modular pl320 IPC code
  powerpc: don't use module_init for non-modular core hugetlb code
  powerpc: use subsys_initcall for Freescale Local Bus
  x86: don't use module_init for non-modular core bootflag code
  netfilter: don't use module_init/exit in core IPV4 code
  fs/notify: don't use module_init for non-modular inotify_user code
  mm: replace module_init usages with subsys_initcall in nommu.c
2015-07-02 10:36:29 -07:00
Paul Gortmaker
89f08f6440 arm: use subsys_initcall in non-modular pl320 IPC code
The drivers/mailbox/pl320-ipc.o is dependent on config PL320_MBOX
which is declared as a bool.  Hence the code is never going to be
modular.  So using module_init as an alias for __initcall can be
somewhat misleading.

Fix this up now, so that we can relocate module_init from
init.h into module.h in the future.  If we don't do this, we'd
have to add module.h to obviously non-modular code, and that
would be a worse thing.  Also add an inclusion of init.h, as
that was previously implicit.

Note that direct use of __initcall is discouraged, vs. one
of the priority categorized subgroups.  As __initcall gets
mapped onto device_initcall, our use of subsys_initcall (which
seems to make sense for IPC code) will thus change this
registration from level 6-device to level 4-subsys (i.e. slightly
earlier).  However no impact of that small difference is expected.

Cc: Russell King <linux@arm.linux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2015-06-16 14:12:35 -04:00
Eric Anholt
7d641938aa mailbox/bcm2835: Fix mailbox full detection.
With the VC reader blocked and the ARM writing, MAIL0_STA reads empty
permanently while MAIL1_STA goes from empty (0x40000000) to non-empty
(0x00000001-0x00000007) to full (0x80000008).

This bug ended up having no effect on us, because all of our
transactions in the client driver were synchronous and under a mutex.

Suggested-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-06-13 16:20:39 +05:30
Lee Jones
dfabde206a mailbox: Add ability for clients to request channels by name
This patch supplies a new framework API; mbox_request_channel_byname().

It works by supplying the usual client pointer as the first argument and
a string as the second.  The API will search the client's node for a
'mbox-names' property then request a channel in the normal way using the
requested string's index as the expected second 'index' argument.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-06-11 22:19:45 +05:30
Lubomir Rintel
0bae6af6d7 mailbox: Enable BCM2835 mailbox support
This mailbox driver provides a single mailbox channel to write 32-bit
values to the VPU and get a 32-bit response.  The Raspberry Pi
firmware uses this mailbox channel to implement firmware calls, while
Roku 2 (despite being derived from the same firmware tree) doesn't.

The driver was originally submitted by Lubomir, based on the
out-of-tree 2708 mailbox driver.  Eric Anholt fixed it up for
upstreaming, with the major functional change being that it now has no
notion of multiple channels (since that is a firmware-dependent
concept) and instead the raspberrypi-firmware driver will do that
bit-twiddling in its own messages.
[Jassi: made the 'mbox_chan_ops' struct as const and removed a redundant
variable]

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Craig McGeachie <slapdau@yahoo.com.au>
Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-06-11 22:19:40 +05:30
Benson Leung
2d805fc1c6 mailbox: Fix up error handling in mbox_request_channel()
mbox_request_channel() currently returns EBUSY in the event the controller
is not present or if of_xlate() fails, but in neither case is EBUSY really
appropriate.  Return EPROBE_DEFER if the controller is not yet present
and change of_xlate() to return an ERR_PTR instead of NULL so that the
error can be propagated back to the caller of mbox_request_channel().

Signed-off-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Acked-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-05-12 09:18:21 +05:30
Andrew Bresticker
05ae797566 mailbox: Make mbox_chan_ops const
The mailbox controller's channel ops ought to be read-only.  Update
all the mailbox drivers to make their mbox_chan_ops const as well.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Cc: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Cc: Ley Foon Tan <lftan@altera.com>
Acked-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-05-12 09:18:16 +05:30
Richard Weinberger
59dd3f0261 mailbox: altera: Add dependency on HAS_IOMEM
Not all architectures have io memory.

Fixes:
drivers/built-in.o: In function `altera_mbox_probe':
mailbox-altera.c:(.text+0x409fd2): undefined reference to `devm_ioremap_resource'

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2015-05-12 09:18:11 +05:30
Jassi Brar
ee23d66af9 mailbox: arm_mhu: add driver for ARM MHU controller
Add driver for the ARM Primecell Message-Handling-Unit(MHU) controller.

Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Andy Green <andy.green@linaro.org>
Signed-off-by: Vincent Yang <vincent.yang@socionext.com>
Signed-off-by: Tetsuya Nuriya <nuriya.tetsuya@socionext.com>
2015-03-17 11:12:01 +05:30
Ashwin Chaugule
33350e6b18 Mailbox: Restructure and simplify PCC mailbox code
Previously the PCC driver depended on the client
side to map the communication space base address. This region
was was then used in the PCC driver and the client side.
The client side used this region to read and write its data
and the PCC driver used it to only write the PCC command.
Removing this split simplifies the PCC driver a lot. This patch
moves all communication region read/writes to the client side.
The PCC clients can now drive the PCC mailbox controller via the
mbox_client_txdone() method.

Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
2015-03-04 21:04:22 +05:30
Linus Torvalds
bfe9183fdc Merge branch 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox framework updates from Jassi Brar.

* 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox: Add Altera mailbox driver
  mailbox: check for bit set before polling
  Mailbox: Fix return value check in pcc_init()
2015-02-11 12:56:40 -08:00
Ley Foon Tan
f62092f6d7 mailbox: Add Altera mailbox driver
The Altera mailbox allows for interprocessor communication. It supports
only one channel and work as either sender or receiver.

Signed-off-by: Ley Foon Tan <lftan@altera.com>
2015-02-06 10:58:27 +05:30
Jassi Brar
01340df8d3 mailbox: check for bit set before polling
Before polling we just need to see if the TXDONE_BY_POLL bit
is set in txdone_method. There may be another bit (method)
specified as well, like TXDONE_BY_ACK.

Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>
2015-02-06 10:58:05 +05:30
Wei Yongjun
356d5d28f2 Mailbox: Fix return value check in pcc_init()
In case of error, the function platform_create_bundle() returns
ERR_PTR() and never returns NULL. The NULL test in the return value
check should be replaced with IS_ERR().

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
2015-02-06 10:57:56 +05:30
Rafael J. Wysocki
efd756daf4 ACPI / PCC: Use pr_debug() for debug messages in pcc_init()
pcc_init() uses pr_err() to print two messages that are really debug
and not interesting to users.  Replace those pr_err() with pr_debug().

Reported-by: Cristian <caravena@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-02-05 00:40:08 +01:00
Linus Torvalds
e6b5be2be4 Driver core patches for 3.19-rc1
Here's the set of driver core patches for 3.19-rc1.
 
 They are dominated by the removal of the .owner field in platform
 drivers.  They touch a lot of files, but they are "simple" changes, just
 removing a line in a structure.
 
 Other than that, a few minor driver core and debugfs changes.  There are
 some ath9k patches coming in through this tree that have been acked by
 the wireless maintainers as they relied on the debugfs changes.
 
 Everything has been in linux-next for a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core update from Greg KH:
 "Here's the set of driver core patches for 3.19-rc1.

  They are dominated by the removal of the .owner field in platform
  drivers.  They touch a lot of files, but they are "simple" changes,
  just removing a line in a structure.

  Other than that, a few minor driver core and debugfs changes.  There
  are some ath9k patches coming in through this tree that have been
  acked by the wireless maintainers as they relied on the debugfs
  changes.

  Everything has been in linux-next for a while"

* tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits)
  Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries"
  fs: debugfs: add forward declaration for struct device type
  firmware class: Deletion of an unnecessary check before the function call "vunmap"
  firmware loader: fix hung task warning dump
  devcoredump: provide a one-way disable function
  device: Add dev_<level>_once variants
  ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries
  ath: use seq_file api for ath9k debugfs files
  debugfs: add helper function to create device related seq_file
  drivers/base: cacheinfo: remove noisy error boot message
  Revert "core: platform: add warning if driver has no owner"
  drivers: base: support cpu cache information interface to userspace via sysfs
  drivers: base: add cpu_device_create to support per-cpu devices
  topology: replace custom attribute macros with standard DEVICE_ATTR*
  cpumask: factor out show_cpumap into separate helper function
  driver core: Fix unbalanced device reference in drivers_probe
  driver core: fix race with userland in device_add()
  sysfs/kernfs: make read requests on pre-alloc files use the buffer.
  sysfs/kernfs: allow attributes to request write buffer be pre-allocated.
  fs: sysfs: return EGBIG on write if offset is larger than file size
  ...
2014-12-14 16:10:09 -08:00
Ashwin Chaugule
86c22f8c9a Mailbox: Add support for Platform Communication Channel
ACPI 5.0+ spec defines a generic mode of communication
between the OS and a platform such as the BMC. This medium
(PCC) is typically used by CPPC (ACPI CPU Performance management),
RAS (ACPI reliability protocol) and MPST (ACPI Memory power
states).

This patch adds PCC support as a Mailbox Controller. As of
ACPI v5.1 there is no provision for clients to lookup mailbox
controllers in a way that Linux expects. e.g. in DT the clients
can list the mailboxes they can associate with in the DT binding
and then provide a unique index to lookup a channel within a mailbox.
Since the ACPI spec doesn't have anything similar, we introduce a
mailbox controller specific API so that when the client calls it,
we know to lookup in the context of a specific controller. This
also helps in keeping a consistent interface across DT and ACPI
for such drivers.

This patch implements basic PCC support using the ACPI v5.1
structures. IRQ mode support will be provided as follow up patches.

Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2014-11-27 12:51:09 +05:30
Suman Anna
8841a66aaa mailbox/omap: adapt to the new mailbox framework
The OMAP mailbox driver and its existing clients (remoteproc
for OMAP4+) are adapted to use the generic mailbox framework.

The main changes for the adaptation are:
  - The tasklet used for Tx is replaced with the state machine from
    the generic mailbox framework. The workqueue used for processing
    the received messages stays intact for minimizing the effects on
    the OMAP mailbox clients.
  - The existing exported client API, omap_mbox_get, omap_mbox_put and
    omap_mbox_send_msg are deleted, as the framework provides equivalent
    functionality. A OMAP-specific omap_mbox_request_channel is added
    though to support non-DT way of requesting mailboxes.
  - The OMAP mailbox driver is integrated with the mailbox framework
    through the proper implementations of mbox_chan_ops, except for
    .last_tx_done and .peek_data. The OMAP mailbox driver does not need
    these ops, as it is completely interrupt driven.
  - The OMAP mailbox driver uses a custom of_xlate controller ops that
    allows phandles for the pargs specifier instead of indexing to avoid
    any channel registration order dependencies.
  - The new framework does not support multiple clients operating on a
    single channel, so the reference counting logic is simplified.
  - The remoteproc driver (current client) is adapted to use the new API.
    The notifier callbacks used within this client is replaced with the
    regular callbacks from the newer framework.
  - The exported OMAP mailbox API are limited to omap_mbox_save_ctx,
    omap_mbox_restore_ctx, omap_mbox_enable_irq & omap_mbox_disable_irq,
    with the signature modified to take in the new mbox_chan handle instead
    of the OMAP specific omap_mbox handle. The first 2 will be removed when
    the OMAP mailbox driver is adapted to runtime_pm. The other exported
    API omap_mbox_request_channel will be removed once existing legacy
    users are converted to DT.

Signed-off-by: Suman Anna <s-anna@ti.com>
Cc: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2014-11-27 12:51:04 +05:30
Sudeep Holla
97b0c7bd2e mailbox: add tx_prepare client callback
If the mailbox controller expects the payload is in place before
initiating the transmit, then it's impossible to reuse the list
maintained by core mailbox code currently. Maintaining another list
for sending the message in the controller seems totally unnecessary
as core mailbox library already provides that feature.

This patch introduces tx_prepare callback in mbox_client which
can be used by the core mailbox library before initiating the
transaction through mbox->ops->send_data. The client driver can
implement this callback to ensure the payload is copied to the
shared memory.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2014-11-27 12:50:59 +05:30
Andrew Bresticker
52a49306d7 mailbox: Don't unnecessarily re-arm the polling timer
poll_txdone() will unconditionally re-arm the polling timer if there was
an active request, even if the active request completed and no other
requests were submitted.  This is fixed by:
 - only re-arming the timer if the controller reported that the current
   transmission has not completed, and,
 - moving the call to poll_txdone() into msg_submit() so that the
   controller gets polled (and the timer re-armed, if necessary) whenever
   a new message is submitted.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2014-11-27 12:21:27 +05:30
Greg Kroah-Hartman
a8a93c6f99 Merge branch 'platform/remove_owner' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into driver-core-next
Remove all .owner fields from platform drivers
2014-11-03 19:53:56 -08:00
Linus Torvalds
43d451f163 Merge branch 'mailbox-for-linus' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox framework from Jassi Brar:
 "A framework for Mailbox controllers and clients have been cooking for
  more than a year now.

  Everybody in the CC list had been copied on patchset revisions and
  most of them have made sounds of approval, though just one concrete
  Reviewed-by.  The patchset has also been in linux-next for a couple of
  weeks now and no conflict has been reported.  The framework has the
  backing of at least 5 platforms, though I can't say if/when they
  upstream their drivers (some businesses have 'changed')"

(Further acked-by by Arnd Bergmann and Suman Anna in the pull request
thread)

* 'mailbox-for-linus' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  dt: mailbox: add generic bindings
  doc: add documentation for mailbox framework
  mailbox: Introduce framework for mailbox
  mailbox: rename pl320-ipc specific mailbox.h
2014-10-21 11:21:19 -07:00
Wolfram Sang
aaa8a418ec mailbox: drop owner assignment from platform_drivers
A platform_driver does not need to set an owner, it will be populated by the
driver core.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-10-20 16:20:43 +02:00
Jassi Brar
2b6d83e2b8 mailbox: Introduce framework for mailbox
Introduce common framework for client/protocol drivers and
controller drivers of Inter-Processor-Communication (IPC).

Client driver developers should have a look at
 include/linux/mailbox_client.h to understand the part of
the API exposed to client drivers.
Similarly controller driver developers should have a look
at include/linux/mailbox_controller.h

Reviewed-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2014-10-08 10:39:41 +05:30
Suman Anna
f2fc42b6ac mailbox: rename pl320-ipc specific mailbox.h
The patch 30058677 "ARM / highbank: add support for pl320 IPC"
added a pl320 IPC specific header file as a generic mailbox.h.
This file has been renamed appropriately to allow the
introduction of the generic mailbox API framework.

Acked-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Mark Brown <broonie@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
2014-10-08 10:39:33 +05:30
Suman Anna
75288cc66d mailbox/omap: add support for parsing dt devices
Logic has been added to the OMAP2+ mailbox code to parse the
mailbox dt nodes and construct the different sub-mailboxes
associated with the instance. The DT representation of the
sub-mailbox devices is different from legacy platform data
representation to allow flexibility of interrupt configuration
between Tx and Rx fifos (to also possibly allow simplex devices
in the future). The DT representation gathers similar information
that was being passed previously through the platform data, except
for the interrupt type information, which is gathered through driver
compatible match data.

The non-DT support has to be maintained for now to not break
OMAP3 legacy boot, and the legacy-style code will be cleaned
up once OMAP3 is also converted to DT-boot only.

Cc: Jassi Brar <jassisinghbrar@gmail.com>
Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Suman Anna <s-anna@ti.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2014-09-11 11:39:14 -07:00
Suman Anna
72c1c8179c mailbox/omap: add a parent structure for every IP instance
A new structure, omap_mbox_device, is added to contain
the global variables pertinent to a mailbox h/w IP block.
This enables the support for having multiple instances of
the same h/w IP block in the SoC. This is in preparation
to support the DRA7 SoC, which is the first SoC in the OMAP
family to have multiple mailbox IP instances.

The changes include enhancements to the sub-mailbox registration
logic and mbox startup sequencing, removing the usage of single
global configuration variables for all h/w instances, and storing
the registered sub-mailboxes with the parent mailbox device
structure.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2014-07-29 01:57:25 -07:00
Suman Anna
be3322eb70 mailbox/omap: remove the private mailbox structure
The structure omap_mbox_priv is used previously to store arch
specific (OMAP1 vs OMAP2+) data, and is no longer required to be
maintained separately. Instead, absorb its elements into either
the sub-mailbox device structure, omap_mbox, or the individual
fifo descriptor structure, omap_mbox_fifo.

The newmsg_bit and notfull_bit used on Rx and Tx fifos respectively
are represented by the new intr_bit field in the fifo descriptor
structure. The interrupt configuration registers are also moved
into the fifo descriptor structure to allow the Rx and Tx fifos
to use different interrupt lines/users.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2014-07-29 01:57:25 -07:00
Suman Anna
5040f53438 mailbox/omap: consolidate OMAP mailbox driver
There is no need for a separate common OMAP mailbox module
now that the OMAP1 mailbox driver has been removed. So,
consolidate the two individual OMAP mailbox modules into a
single driver. This streamlines the driver for converting
to mailbox framework.

The following are the main changes:
- collapse mailbox-omap2.c into omap-mailbox.c
- remove omap_mbox_ops and replace the ops calls with
  the equivalent functionality.
- simplify the sub-mailbox startup/shutdown functionality,
  the one-time operations are moved into probe, and the
  pm_runtime_get_sync and pm_runtime_put_sync can be invoked
  without using a configuration counter.
- move all definitions from private omap_mbox.h into the
  source code, and eliminate this internal header.
- rename some variables that used the omap2_mbox prefix with
  a generic omap_mbox prefix.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2014-07-29 01:57:25 -07:00
Suman Anna
ef45eae6e9 mailbox/omap: simplify the fifo assignment by using macros
The OMAP mailbox IP has two different type of interrupt configuration
registers between OMAP4+ SoCs and OMAP2/3 SoCs. Simplify the current
interrupt configuration by using a single macro that translates the
two variants.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2014-07-29 01:57:25 -07:00
Suman Anna
fe714a46a4 mailbox/omap: remove omap_mbox_type_t from mailbox ops
The type definition omap_mbox_type_t used for distinguishing
OMAP1 from OMAP2+ mailboxes is no longer needed after the
removal of OMAP1 mailbox driver, and has therefore been
cleaned up. This cleanup also eliminates the need for the
polling logic used for checking the transmit readiness.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2014-07-29 01:57:25 -07:00
Suman Anna
79859094e5 mailbox/omap: remove OMAP1 mailbox driver
There are no existing users for OMAP1 mailbox driver
in kernel. Commit ab6f775 "Removing dead OMAP_DSP"
has cleaned up all the dead code related to the only
possible user, including the creation of the mailbox
platform device.

Remove this stale driver so that the OMAP mailbox
driver can be simplified and streamlined better for
converting to mailbox framework.

Signed-off-by: Suman Anna <s-anna@ti.com>
Acked-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2014-07-29 01:55:09 -07:00
Suman Anna
28299a47f4 mailbox/omap: use devm_* interfaces
Use the various devm_ interfaces to simplify the cleanup in
probe and remove functions in OMAP2+ mailbox driver.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2014-07-29 01:55:09 -07:00
Dan Carpenter
4a102b4d14 drivers/mailbox/omap: make mbox->irq signed for error handling
There is a bug in omap2_mbox_probe() where we try do:

		mbox->irq = platform_get_irq(pdev, info->irq_id);
		if (mbox->irq < 0) {

The problem is that mbox->irq is unsigned so the error handling doesn't
work.  I've changed it to a signed integer.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Suman Anna <s-anna@ti.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Omar Ramirez Luna <omar.ramirez@copitl.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-01-23 16:36:53 -08:00
Jingoo Han
d287c1d03a mailbox: remove unnecessary platform_set_drvdata()
The driver core clears the driver data to NULL after device_release
or on probe failure. Thus, it is not needed to manually clear the
device driver data to NULL.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2013-09-18 12:02:00 -07:00
Suman Anna
c869c75c16 mailbox/omap: move the OMAP mailbox framework to drivers
The mailbox hardware (in OMAP) uses a queued mailbox interrupt
mechanism that provides a communication channel between processors
through a set of registers and their associated interrupt signals
by sending and receiving messages.

The OMAP mailbox framework/driver code is moved to be under
drivers/mailbox, in preparation for adapting to a common mailbox
driver framework. This allows the build for OMAP mailbox to be
enabled (it was disabled during the multi-platform support).

As part of the migration from plat and mach code:
- Kconfig symbols have been renamed to build OMAP1 or OMAP2+ drivers.
- mailbox.h under plat-omap/plat/include has been split into a public
  and private header files. The public header has only the API related
  functions and types.
- The module name mailbox.ko from plat-omap is changed to
  omap-mailbox.ko
- The module name mailbox_mach.ko from mach-omapX is changed as
    mailbox_omap1.ko for OMAP1
    mailbox_omap2.ko for OMAP2+

Cc: Tony Lindgren <tony@atomide.com>
[gregkh@linuxfoundation.org: ack for staging part]
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Omar Ramirez Luna <omar.ramirez@copitl.com>
Signed-off-by: Suman Anna <s-anna@ti.com>
2013-06-11 11:41:51 -05:00
Mark Langsdorf
091930a2e6 mailbox, pl320-ipc: remove __init from probe function
Avoids a section mismatch.

Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-04 14:23:11 +01:00
Rob Herring
300586778d ARM / highbank: add support for pl320 IPC
The pl320 IPC allows for interprocessor communication between the
highbank A9 and the EnergyCore Management Engine. The pl320 implements
a straightforward mailbox protocol.

Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 00:01:15 +01:00