AuxXxilium/linux_dsm_epyc7002
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7fbcf3afe6
linux_dsm_epyc7002/drivers/tty/serial
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Jeremy Kerr 7fbcf3afe6 drivers/serial: Add driver for Aspeed virtual UART 
This change adds a driver for the 16550-based Aspeed virtual UART
device. We use a similar process to the of_serial driver for device
probe, but expose some VUART-specific functions through sysfs too.

The VUART is two UART 'front ends' connected by their FIFO (no actual
serial line in between). One is on the BMC side (management controller)
and one is on the host CPU side.

This driver is for the BMC side. The sysfs files allow the BMC
userspace, which owns the system configuration policy, to specify at
what IO port and interrupt number the host side will appear to the host
on the Host <-> BMC LPC bus. It could be different on a different system
(though most of them use 3f8/4).

OpenPOWER host firmware doesn't like it when the host-side of the
VUART's FIFO is not drained. This driver only disables host TX discard
mode when the port is in use. We set the VUART enabled bit when we bind
to the device, and clear it on unbind.

We don't want to do this on open/release, as the host may be using this
bit to configure serial output modes, which is independent of whether
the devices has been opened by BMC userspace.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-05-18 16:19:16 +02:00
..
8250 drivers/serial: Add driver for Aspeed virtual UART 2017-05-18 16:19:16 +02:00
cpm_uart tty: serial: cpm_uart: make use of for_each_node_by_type() 2017-02-03 10:12:16 +01:00
jsm tty: serial: jsm_tty: constify uart_ops structures 2016-09-02 15:01:16 +02:00
21285.c
altera_jtaguart.c serial: altera_jtaguart: add earlycon support 2017-03-17 14:14:00 +09:00
altera_uart.c serial: altera_uart: add earlycon support 2017-03-31 16:56:10 +02:00
amba-pl010.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
amba-pl011.c tty: pl011: use "qdf2400_e44" as the earlycon name for QDF2400 E44 2017-04-18 17:47:42 +02:00
amba-pl011.h
apbuart.c
apbuart.h
ar933x_uart.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
arc_uart.c serial/arc: constify uart_ops structures 2016-09-01 21:05:41 +02:00
atmel_serial.c Merge 4.11-rc5 into tty-next 2017-04-03 14:18:16 +02:00
atmel_serial.h tty/serial: atmel: move atmel_serial header into driver directory 2017-03-14 10:59:04 +08:00
bcm63xx_uart.c serial/bcm63xx_uart: constify uart_ops structures 2016-09-02 15:01:16 +02:00
bfin_sport_uart.c tty: serial: constify dev_pm_ops structures 2017-01-19 14:20:23 +01:00
bfin_sport_uart.h
bfin_uart.c
clps711x.c serial: clps711x: Changing the compatibility string to match with the smallest supported chip 2016-07-06 17:38:16 +02:00
crisv10.c sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
crisv10.h
digicolor-usart.c tty/serial: digicolor: Fix bad usage of IS_ERR_VALUE 2016-02-14 17:39:36 -08:00
dz.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
dz.h
earlycon-arm-semihost.c tty/serial: mark __init early_smh_setup() static 2016-09-02 15:03:35 +02:00
earlycon.c ACPI: parse SPCR and enable matching console 2016-09-28 17:46:46 +02:00
efm32-uart.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
etraxfs-uart.c
fsl_lpuart.c tty: serial: fsl_lpuart: lock port on console write 2017-03-31 16:56:10 +02:00
icom.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
icom.h
ifx6x60.c serial: ifx6x60: Free memory when probe fails 2016-11-10 14:50:46 +01:00
ifx6x60.h
imx.c imx-serial: Reduce RX DMA startup latency when opening for reading 2017-04-11 21:36:43 +02:00
ioc3_serial.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
ioc4_serial.c scripts/spelling.txt: add "comsume(r)" pattern and fix typo instances 2017-02-27 18:43:47 -08:00
ip22zilog.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
ip22zilog.h
Kconfig serial: altera_uart: add earlycon support 2017-03-31 16:56:10 +02:00
kgdb_nmi.c
kgdboc.c
lantiq.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
lpc32xx_hs.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
m32r_sio_reg.h
m32r_sio.c serial: m32r_sio: make it explicitly non-modular 2016-06-25 14:00:06 -07:00
Makefile serial: small Makefile reordering 2017-04-18 18:01:52 +02:00
max310x.c serial: max310x: Add support for newer silicon revisions 2017-01-12 11:51:24 +01:00
max3100.c tty: serial: constify uart_ops structures 2016-09-02 15:01:16 +02:00
mcf.c
men_z135_uart.c tty: serial: constify uart_ops structures 2016-09-02 15:01:16 +02:00
meson_uart.c tty: serial: meson: allow baud-rates higher than 115200 2017-01-19 14:38:57 +01:00
mpc52xx_uart.c tty: serial: constify psc_ops structs 2016-02-06 22:31:47 -08:00
mps2-uart.c serial: mps2-uart: make driver explicitly non-modular 2016-06-25 14:01:57 -07:00
mpsc.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
msm_serial.c tty: serial: msm: Fix module autoload 2017-01-12 11:51:25 +01:00
mux.c
mvebu-uart.c serial: mvebu-uart: free the IRQ in ->shutdown() 2016-06-25 14:00:06 -07:00
mxs-auart.c serial: mxs-auart: Fix baudrate calculation 2017-03-31 17:26:19 +02:00
netx-serial.c
omap-serial.c tty: serial: omap: add UPF_BOOT_AUTOCONF flag for DT init 2017-04-12 22:12:16 +02:00
pch_uart.c serial: pch_uart: add terminate entry for dmi_system_id tables 2016-10-27 16:01:31 +02:00
pic32_uart.c serial: pic32_uart: Fix 'request_irq' and 'free_irq' inconsistancy 2017-01-12 11:51:24 +01:00
pic32_uart.h serial: pic32_uart: Add PIC32 UART driver 2016-05-13 14:01:56 +02:00
pmac_zilog.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
pmac_zilog.h
pnx8xxx_uart.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
pxa.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
rp2.c
sa1100.c
samsung.c serial: samsung: Remove useless spinlock 2017-04-08 18:58:52 +02:00
samsung.h serial: samsung: Simplify DMA engine initialization code 2017-01-12 11:51:24 +01:00
sb1250-duart.c drivers: convert sbd_duart.map_guard from atomic_t to refcount_t 2017-03-14 11:01:40 +08:00
sc16is7xx.c sched/headers: Prepare for new header dependencies before moving code to <uapi/linux/sched/types.h> 2017-03-02 08:42:27 +01:00
sccnxp.c
serial_core.c serial: core: Re-use struct uart_port {name} field 2017-04-08 18:51:57 +02:00
serial_ks8695.c serial: Fix ASYNC_* => UPF_* flags misuse 2016-01-28 14:17:42 -08:00
serial_mctrl_gpio.c serial: mctrl_gpio: enable API usage only for initialized mctrl_gpios struct 2016-06-25 14:30:42 -07:00
serial_mctrl_gpio.h serial: mctrl_gpio: add modem control read routine 2016-06-25 14:30:42 -07:00
serial_txx9.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
serial-tegra.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
sh-sci.c serial: sh-sci: Fix (AUTO)RTS in sci_init_pins() 2017-03-31 15:29:06 +02:00
sh-sci.h serial: sh-sci: consider DR (data ready) bit adequately 2017-02-03 10:14:10 +01:00
sirfsoc_uart.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
sirfsoc_uart.h serial: sirf: make fifo functions static 2016-06-25 14:01:57 -07:00
sn_console.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
sprd_serial.c serial: sprd: adjust TIMEOUT to a big value 2017-04-08 18:42:47 +02:00
st-asc.c TTY/Serial patches for 4.12-rc1 2017-05-08 18:49:23 -07:00
stm32-usart.c serial: stm32: mark symbols static where possible 2016-09-27 12:55:27 +02:00
stm32-usart.h serial: stm32: Fix comparisons with undefined register 2016-10-27 16:00:31 +02:00
suncore.c
sunhv.c sparc64: Send break twice from console to return to boot prom 2017-02-23 08:27:24 -08:00
sunsab.c
sunsab.h
sunsu.c serial: sunsu: Free memory when probe fails 2016-11-16 10:57:26 +01:00
sunzilog.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
sunzilog.h
tilegx.c
timbuart.c tty: serial: constify uart_ops structures 2016-09-02 15:01:16 +02:00
timbuart.h
uartlite.c uartlite: Adding a kernel parameter for the number of uartlites 2017-03-17 14:14:30 +09:00
ucc_uart.c QE-UART: add "fsl,t1040-ucc-uart" to of_device_id 2016-05-01 13:55:12 -07:00
vr41xx_siu.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
vt8500_serial.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
xilinx_uartps.c serial: xuartps: Enable clocks in the pm disable case also 2017-04-08 18:54:07 +02:00
zs.c tty: serial: constify uart_ops structures 2017-01-27 09:23:36 +01:00
zs.h