mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-11 20:36:45 +07:00
28f65c11f2
Several fixes as well where the +1 was missing. Done via coccinelle scripts like: @@ struct resource *ptr; @@ - ptr->end - ptr->start + 1 + resource_size(ptr) and some grep and typing. Mostly uncompiled, no cross-compilers. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
482 lines
13 KiB
C
482 lines
13 KiB
C
/*
|
|
* Wireless Host Controller: Radio Control Interface (WHCI v0.95[2.3])
|
|
* Radio Control command/event transport to the UWB stack
|
|
*
|
|
* Copyright (C) 2005-2006 Intel Corporation
|
|
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version
|
|
* 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA.
|
|
*
|
|
*
|
|
* Initialize and hook up the Radio Control interface.
|
|
*
|
|
* For each device probed, creates an 'struct whcrc' which contains
|
|
* just the representation of the UWB Radio Controller, and the logic
|
|
* for reading notifications and passing them to the UWB Core.
|
|
*
|
|
* So we initialize all of those, register the UWB Radio Controller
|
|
* and setup the notification/event handle to pipe the notifications
|
|
* to the UWB management Daemon.
|
|
*
|
|
* Once uwb_rc_add() is called, the UWB stack takes control, resets
|
|
* the radio and readies the device to take commands the UWB
|
|
* API/user-space.
|
|
*
|
|
* Note this driver is just a transport driver; the commands are
|
|
* formed at the UWB stack and given to this driver who will deliver
|
|
* them to the hw and transfer the replies/notifications back to the
|
|
* UWB stack through the UWB daemon (UWBD).
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/uwb.h>
|
|
#include <linux/uwb/whci.h>
|
|
#include <linux/uwb/umc.h>
|
|
|
|
#include "uwb-internal.h"
|
|
|
|
/**
|
|
* Descriptor for an instance of the UWB Radio Control Driver that
|
|
* attaches to the URC interface of the WHCI PCI card.
|
|
*
|
|
* Unless there is a lock specific to the 'data members', all access
|
|
* is protected by uwb_rc->mutex.
|
|
*/
|
|
struct whcrc {
|
|
struct umc_dev *umc_dev;
|
|
struct uwb_rc *uwb_rc; /* UWB host controller */
|
|
|
|
unsigned long area;
|
|
void __iomem *rc_base;
|
|
size_t rc_len;
|
|
spinlock_t irq_lock;
|
|
|
|
void *evt_buf, *cmd_buf;
|
|
dma_addr_t evt_dma_buf, cmd_dma_buf;
|
|
wait_queue_head_t cmd_wq;
|
|
struct work_struct event_work;
|
|
};
|
|
|
|
/**
|
|
* Execute an UWB RC command on WHCI/RC
|
|
*
|
|
* @rc: Instance of a Radio Controller that is a whcrc
|
|
* @cmd: Buffer containing the RCCB and payload to execute
|
|
* @cmd_size: Size of the command buffer.
|
|
*
|
|
* We copy the command into whcrc->cmd_buf (as it is pretty and
|
|
* aligned`and physically contiguous) and then press the right keys in
|
|
* the controller's URCCMD register to get it to read it. We might
|
|
* have to wait for the cmd_sem to be open to us.
|
|
*
|
|
* NOTE: rc's mutex has to be locked
|
|
*/
|
|
static int whcrc_cmd(struct uwb_rc *uwb_rc,
|
|
const struct uwb_rccb *cmd, size_t cmd_size)
|
|
{
|
|
int result = 0;
|
|
struct whcrc *whcrc = uwb_rc->priv;
|
|
struct device *dev = &whcrc->umc_dev->dev;
|
|
u32 urccmd;
|
|
|
|
if (cmd_size >= 4096)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* If the URC is halted, then the hardware has reset itself.
|
|
* Attempt to recover by restarting the device and then return
|
|
* an error as it's likely that the current command isn't
|
|
* valid for a newly started RC.
|
|
*/
|
|
if (le_readl(whcrc->rc_base + URCSTS) & URCSTS_HALTED) {
|
|
dev_err(dev, "requesting reset of halted radio controller\n");
|
|
uwb_rc_reset_all(uwb_rc);
|
|
return -EIO;
|
|
}
|
|
|
|
result = wait_event_timeout(whcrc->cmd_wq,
|
|
!(le_readl(whcrc->rc_base + URCCMD) & URCCMD_ACTIVE), HZ/2);
|
|
if (result == 0) {
|
|
dev_err(dev, "device is not ready to execute commands\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
memmove(whcrc->cmd_buf, cmd, cmd_size);
|
|
le_writeq(whcrc->cmd_dma_buf, whcrc->rc_base + URCCMDADDR);
|
|
|
|
spin_lock(&whcrc->irq_lock);
|
|
urccmd = le_readl(whcrc->rc_base + URCCMD);
|
|
urccmd &= ~(URCCMD_EARV | URCCMD_SIZE_MASK);
|
|
le_writel(urccmd | URCCMD_ACTIVE | URCCMD_IWR | cmd_size,
|
|
whcrc->rc_base + URCCMD);
|
|
spin_unlock(&whcrc->irq_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int whcrc_reset(struct uwb_rc *rc)
|
|
{
|
|
struct whcrc *whcrc = rc->priv;
|
|
|
|
return umc_controller_reset(whcrc->umc_dev);
|
|
}
|
|
|
|
/**
|
|
* Reset event reception mechanism and tell hw we are ready to get more
|
|
*
|
|
* We have read all the events in the event buffer, so we are ready to
|
|
* reset it to the beginning.
|
|
*
|
|
* This is only called during initialization or after an event buffer
|
|
* has been retired. This means we can be sure that event processing
|
|
* is disabled and it's safe to update the URCEVTADDR register.
|
|
*
|
|
* There's no need to wait for the event processing to start as the
|
|
* URC will not clear URCCMD_ACTIVE until (internal) event buffer
|
|
* space is available.
|
|
*/
|
|
static
|
|
void whcrc_enable_events(struct whcrc *whcrc)
|
|
{
|
|
u32 urccmd;
|
|
|
|
le_writeq(whcrc->evt_dma_buf, whcrc->rc_base + URCEVTADDR);
|
|
|
|
spin_lock(&whcrc->irq_lock);
|
|
urccmd = le_readl(whcrc->rc_base + URCCMD) & ~URCCMD_ACTIVE;
|
|
le_writel(urccmd | URCCMD_EARV, whcrc->rc_base + URCCMD);
|
|
spin_unlock(&whcrc->irq_lock);
|
|
}
|
|
|
|
static void whcrc_event_work(struct work_struct *work)
|
|
{
|
|
struct whcrc *whcrc = container_of(work, struct whcrc, event_work);
|
|
size_t size;
|
|
u64 urcevtaddr;
|
|
|
|
urcevtaddr = le_readq(whcrc->rc_base + URCEVTADDR);
|
|
size = urcevtaddr & URCEVTADDR_OFFSET_MASK;
|
|
|
|
uwb_rc_neh_grok(whcrc->uwb_rc, whcrc->evt_buf, size);
|
|
whcrc_enable_events(whcrc);
|
|
}
|
|
|
|
/**
|
|
* Catch interrupts?
|
|
*
|
|
* We ack inmediately (and expect the hw to do the right thing and
|
|
* raise another IRQ if things have changed :)
|
|
*/
|
|
static
|
|
irqreturn_t whcrc_irq_cb(int irq, void *_whcrc)
|
|
{
|
|
struct whcrc *whcrc = _whcrc;
|
|
struct device *dev = &whcrc->umc_dev->dev;
|
|
u32 urcsts;
|
|
|
|
urcsts = le_readl(whcrc->rc_base + URCSTS);
|
|
if (!(urcsts & URCSTS_INT_MASK))
|
|
return IRQ_NONE;
|
|
le_writel(urcsts & URCSTS_INT_MASK, whcrc->rc_base + URCSTS);
|
|
|
|
if (urcsts & URCSTS_HSE) {
|
|
dev_err(dev, "host system error -- hardware halted\n");
|
|
/* FIXME: do something sensible here */
|
|
goto out;
|
|
}
|
|
if (urcsts & URCSTS_ER)
|
|
schedule_work(&whcrc->event_work);
|
|
if (urcsts & URCSTS_RCI)
|
|
wake_up_all(&whcrc->cmd_wq);
|
|
out:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
|
|
/**
|
|
* Initialize a UMC RC interface: map regions, get (shared) IRQ
|
|
*/
|
|
static
|
|
int whcrc_setup_rc_umc(struct whcrc *whcrc)
|
|
{
|
|
int result = 0;
|
|
struct device *dev = &whcrc->umc_dev->dev;
|
|
struct umc_dev *umc_dev = whcrc->umc_dev;
|
|
|
|
whcrc->area = umc_dev->resource.start;
|
|
whcrc->rc_len = resource_size(&umc_dev->resource);
|
|
result = -EBUSY;
|
|
if (request_mem_region(whcrc->area, whcrc->rc_len, KBUILD_MODNAME) == NULL) {
|
|
dev_err(dev, "can't request URC region (%zu bytes @ 0x%lx): %d\n",
|
|
whcrc->rc_len, whcrc->area, result);
|
|
goto error_request_region;
|
|
}
|
|
|
|
whcrc->rc_base = ioremap_nocache(whcrc->area, whcrc->rc_len);
|
|
if (whcrc->rc_base == NULL) {
|
|
dev_err(dev, "can't ioremap registers (%zu bytes @ 0x%lx): %d\n",
|
|
whcrc->rc_len, whcrc->area, result);
|
|
goto error_ioremap_nocache;
|
|
}
|
|
|
|
result = request_irq(umc_dev->irq, whcrc_irq_cb, IRQF_SHARED,
|
|
KBUILD_MODNAME, whcrc);
|
|
if (result < 0) {
|
|
dev_err(dev, "can't allocate IRQ %d: %d\n",
|
|
umc_dev->irq, result);
|
|
goto error_request_irq;
|
|
}
|
|
|
|
result = -ENOMEM;
|
|
whcrc->cmd_buf = dma_alloc_coherent(&umc_dev->dev, PAGE_SIZE,
|
|
&whcrc->cmd_dma_buf, GFP_KERNEL);
|
|
if (whcrc->cmd_buf == NULL) {
|
|
dev_err(dev, "Can't allocate cmd transfer buffer\n");
|
|
goto error_cmd_buffer;
|
|
}
|
|
|
|
whcrc->evt_buf = dma_alloc_coherent(&umc_dev->dev, PAGE_SIZE,
|
|
&whcrc->evt_dma_buf, GFP_KERNEL);
|
|
if (whcrc->evt_buf == NULL) {
|
|
dev_err(dev, "Can't allocate evt transfer buffer\n");
|
|
goto error_evt_buffer;
|
|
}
|
|
return 0;
|
|
|
|
error_evt_buffer:
|
|
dma_free_coherent(&umc_dev->dev, PAGE_SIZE, whcrc->cmd_buf,
|
|
whcrc->cmd_dma_buf);
|
|
error_cmd_buffer:
|
|
free_irq(umc_dev->irq, whcrc);
|
|
error_request_irq:
|
|
iounmap(whcrc->rc_base);
|
|
error_ioremap_nocache:
|
|
release_mem_region(whcrc->area, whcrc->rc_len);
|
|
error_request_region:
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* Release RC's UMC resources
|
|
*/
|
|
static
|
|
void whcrc_release_rc_umc(struct whcrc *whcrc)
|
|
{
|
|
struct umc_dev *umc_dev = whcrc->umc_dev;
|
|
|
|
dma_free_coherent(&umc_dev->dev, PAGE_SIZE, whcrc->evt_buf,
|
|
whcrc->evt_dma_buf);
|
|
dma_free_coherent(&umc_dev->dev, PAGE_SIZE, whcrc->cmd_buf,
|
|
whcrc->cmd_dma_buf);
|
|
free_irq(umc_dev->irq, whcrc);
|
|
iounmap(whcrc->rc_base);
|
|
release_mem_region(whcrc->area, whcrc->rc_len);
|
|
}
|
|
|
|
|
|
/**
|
|
* whcrc_start_rc - start a WHCI radio controller
|
|
* @whcrc: the radio controller to start
|
|
*
|
|
* Reset the UMC device, start the radio controller, enable events and
|
|
* finally enable interrupts.
|
|
*/
|
|
static int whcrc_start_rc(struct uwb_rc *rc)
|
|
{
|
|
struct whcrc *whcrc = rc->priv;
|
|
struct device *dev = &whcrc->umc_dev->dev;
|
|
|
|
/* Reset the thing */
|
|
le_writel(URCCMD_RESET, whcrc->rc_base + URCCMD);
|
|
if (whci_wait_for(dev, whcrc->rc_base + URCCMD, URCCMD_RESET, 0,
|
|
5000, "hardware reset") < 0)
|
|
return -EBUSY;
|
|
|
|
/* Set the event buffer, start the controller (enable IRQs later) */
|
|
le_writel(0, whcrc->rc_base + URCINTR);
|
|
le_writel(URCCMD_RS, whcrc->rc_base + URCCMD);
|
|
if (whci_wait_for(dev, whcrc->rc_base + URCSTS, URCSTS_HALTED, 0,
|
|
5000, "radio controller start") < 0)
|
|
return -ETIMEDOUT;
|
|
whcrc_enable_events(whcrc);
|
|
le_writel(URCINTR_EN_ALL, whcrc->rc_base + URCINTR);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* whcrc_stop_rc - stop a WHCI radio controller
|
|
* @whcrc: the radio controller to stop
|
|
*
|
|
* Disable interrupts and cancel any pending event processing work
|
|
* before clearing the Run/Stop bit.
|
|
*/
|
|
static
|
|
void whcrc_stop_rc(struct uwb_rc *rc)
|
|
{
|
|
struct whcrc *whcrc = rc->priv;
|
|
struct umc_dev *umc_dev = whcrc->umc_dev;
|
|
|
|
le_writel(0, whcrc->rc_base + URCINTR);
|
|
cancel_work_sync(&whcrc->event_work);
|
|
|
|
le_writel(0, whcrc->rc_base + URCCMD);
|
|
whci_wait_for(&umc_dev->dev, whcrc->rc_base + URCSTS,
|
|
URCSTS_HALTED, URCSTS_HALTED, 100, "radio controller stop");
|
|
}
|
|
|
|
static void whcrc_init(struct whcrc *whcrc)
|
|
{
|
|
spin_lock_init(&whcrc->irq_lock);
|
|
init_waitqueue_head(&whcrc->cmd_wq);
|
|
INIT_WORK(&whcrc->event_work, whcrc_event_work);
|
|
}
|
|
|
|
/**
|
|
* Initialize the radio controller.
|
|
*
|
|
* NOTE: we setup whcrc->uwb_rc before calling uwb_rc_add(); in the
|
|
* IRQ handler we use that to determine if the hw is ready to
|
|
* handle events. Looks like a race condition, but it really is
|
|
* not.
|
|
*/
|
|
static
|
|
int whcrc_probe(struct umc_dev *umc_dev)
|
|
{
|
|
int result;
|
|
struct uwb_rc *uwb_rc;
|
|
struct whcrc *whcrc;
|
|
struct device *dev = &umc_dev->dev;
|
|
|
|
result = -ENOMEM;
|
|
uwb_rc = uwb_rc_alloc();
|
|
if (uwb_rc == NULL) {
|
|
dev_err(dev, "unable to allocate RC instance\n");
|
|
goto error_rc_alloc;
|
|
}
|
|
whcrc = kzalloc(sizeof(*whcrc), GFP_KERNEL);
|
|
if (whcrc == NULL) {
|
|
dev_err(dev, "unable to allocate WHC-RC instance\n");
|
|
goto error_alloc;
|
|
}
|
|
whcrc_init(whcrc);
|
|
whcrc->umc_dev = umc_dev;
|
|
|
|
result = whcrc_setup_rc_umc(whcrc);
|
|
if (result < 0) {
|
|
dev_err(dev, "Can't setup RC UMC interface: %d\n", result);
|
|
goto error_setup_rc_umc;
|
|
}
|
|
whcrc->uwb_rc = uwb_rc;
|
|
|
|
uwb_rc->owner = THIS_MODULE;
|
|
uwb_rc->cmd = whcrc_cmd;
|
|
uwb_rc->reset = whcrc_reset;
|
|
uwb_rc->start = whcrc_start_rc;
|
|
uwb_rc->stop = whcrc_stop_rc;
|
|
|
|
result = uwb_rc_add(uwb_rc, dev, whcrc);
|
|
if (result < 0)
|
|
goto error_rc_add;
|
|
umc_set_drvdata(umc_dev, whcrc);
|
|
return 0;
|
|
|
|
error_rc_add:
|
|
whcrc_release_rc_umc(whcrc);
|
|
error_setup_rc_umc:
|
|
kfree(whcrc);
|
|
error_alloc:
|
|
uwb_rc_put(uwb_rc);
|
|
error_rc_alloc:
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Clean up the radio control resources
|
|
*
|
|
* When we up the command semaphore, everybody possibly held trying to
|
|
* execute a command should be granted entry and then they'll see the
|
|
* host is quiescing and up it (so it will chain to the next waiter).
|
|
* This should not happen (in any case), as we can only remove when
|
|
* there are no handles open...
|
|
*/
|
|
static void whcrc_remove(struct umc_dev *umc_dev)
|
|
{
|
|
struct whcrc *whcrc = umc_get_drvdata(umc_dev);
|
|
struct uwb_rc *uwb_rc = whcrc->uwb_rc;
|
|
|
|
umc_set_drvdata(umc_dev, NULL);
|
|
uwb_rc_rm(uwb_rc);
|
|
whcrc_release_rc_umc(whcrc);
|
|
kfree(whcrc);
|
|
uwb_rc_put(uwb_rc);
|
|
}
|
|
|
|
static int whcrc_pre_reset(struct umc_dev *umc)
|
|
{
|
|
struct whcrc *whcrc = umc_get_drvdata(umc);
|
|
struct uwb_rc *uwb_rc = whcrc->uwb_rc;
|
|
|
|
uwb_rc_pre_reset(uwb_rc);
|
|
return 0;
|
|
}
|
|
|
|
static int whcrc_post_reset(struct umc_dev *umc)
|
|
{
|
|
struct whcrc *whcrc = umc_get_drvdata(umc);
|
|
struct uwb_rc *uwb_rc = whcrc->uwb_rc;
|
|
|
|
return uwb_rc_post_reset(uwb_rc);
|
|
}
|
|
|
|
/* PCI device ID's that we handle [so it gets loaded] */
|
|
static struct pci_device_id __used whcrc_id_table[] = {
|
|
{ PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) },
|
|
{ /* empty last entry */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, whcrc_id_table);
|
|
|
|
static struct umc_driver whcrc_driver = {
|
|
.name = "whc-rc",
|
|
.cap_id = UMC_CAP_ID_WHCI_RC,
|
|
.probe = whcrc_probe,
|
|
.remove = whcrc_remove,
|
|
.pre_reset = whcrc_pre_reset,
|
|
.post_reset = whcrc_post_reset,
|
|
};
|
|
|
|
static int __init whcrc_driver_init(void)
|
|
{
|
|
return umc_driver_register(&whcrc_driver);
|
|
}
|
|
module_init(whcrc_driver_init);
|
|
|
|
static void __exit whcrc_driver_exit(void)
|
|
{
|
|
umc_driver_unregister(&whcrc_driver);
|
|
}
|
|
module_exit(whcrc_driver_exit);
|
|
|
|
MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
|
|
MODULE_DESCRIPTION("Wireless Host Controller Radio Control Driver");
|
|
MODULE_LICENSE("GPL");
|