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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
..
accessibility
acpi More ACPI updates for v4.12-rc1 2017-05-10 09:35:42 -07:00
amba
android
ata ARM: SoC driver updates 2017-05-09 10:01:15 -07:00
atm
auxdisplay
base More power management updates for v4.12-rc1 2017-05-10 09:12:30 -07:00
bcma
block virtio: fixes, cleanups, performance 2017-05-10 11:33:08 -07:00
bluetooth Bluetooth: hci_ldisc: Add protocol check to hci_uart_tx_wakeup() 2017-04-30 12:22:14 +02:00
bus
cdrom
char Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
clk Sort of on the quieter side this time, which is probably due more 2017-05-10 13:38:18 -07:00
clocksource Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-12 10:43:25 -07:00
connector
cpufreq Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-05-12 09:56:30 -07:00
cpuidle Merge branches 'pm-domains', 'pm-cpuidle', 'pm-sleep' and 'powercap' 2017-05-09 23:21:46 +02:00
crypto virtio: fixes, cleanups, performance 2017-05-10 11:33:08 -07:00
dax Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 2017-05-12 15:43:10 -07:00
dca
devfreq
dio
dma dmaengine updates for 4.12-rc1 2017-05-09 15:40:28 -07:00
dma-buf
edac
eisa
extcon
firewire
firmware ARM: SoC driver updates 2017-05-09 10:01:15 -07:00
fmc
fpga
fsi
gpio Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
gpu drm/i915: Make vblank evade warnings optional 2017-05-12 14:28:02 +10:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-05-02 19:09:35 -07:00
hsi
hv char/misc patches for 4.12-rc1 2017-05-04 19:15:35 -07:00
hwmon hwmon: (twl4030-madc) drop driver 2017-04-30 11:45:31 -07:00
hwspinlock
hwtracing drivers/hwtracing/intel_th/msu.c: use set_memory.h header 2017-05-08 17:15:14 -07:00
i2c Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
ide ide: don't call memcpy with the same source and destination 2017-05-08 17:36:39 -04:00
idle x86/intel_idle: add Gemini Lake support 2017-05-01 23:17:37 +02:00
iio Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
infiniband Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2017-05-12 11:44:13 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2017-05-13 10:25:05 -07:00
iommu IOMMU Updates for Linux v4.12 2017-05-09 15:15:47 -07:00
ipack
irqchip Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-05-12 09:56:30 -07:00
isdn Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
leds scripts/spelling.txt: add "memory" pattern and fix typos 2017-05-08 17:15:13 -07:00
lguest
lightnvm lightnvm: fix bad back free on error path 2017-05-04 07:53:04 -06:00
macintosh DeviceTree for 4.12: 2017-05-05 19:33:07 -07:00
mailbox
mcb
md mm, vmalloc: use __GFP_HIGHMEM implicitly 2017-05-08 17:15:13 -07:00
media Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
memory MTD updates for 4.12-rc1: 2017-05-11 10:44:22 -07:00
memstick
message
mfd
misc Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
mmc Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
mtd This pull request contains updates for both UBI and UBIFS: 2017-05-13 10:23:12 -07:00
net powerpc updates for 4.12 part 2 2017-05-12 10:04:09 -07:00
nfc
ntb
nubus
nvdimm Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 2017-05-12 15:43:10 -07:00
nvme Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2017-05-11 11:01:56 -07:00
nvmem ARM: SoC driver updates 2017-05-09 10:01:15 -07:00
of powerpc updates for 4.12 part 2 2017-05-12 10:04:09 -07:00
oprofile
parisc
parport
pci Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
pcmcia Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
perf
phy
pinctrl Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-05-02 19:09:35 -07:00
platform char/misc patches for 4.12-rc1 2017-05-04 19:15:35 -07:00
pnp
power power supply and reset changes for the v4.12 series (part 2) 2017-05-12 12:02:21 -07:00
powercap powercap: intel_rapl: Add support for Gemini Lake 2017-04-28 23:56:16 +02:00
pps
ps3
ptp Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-01 16:15:18 -07:00
pwm
rapidio char/misc patches for 4.12-rc1 2017-05-04 19:15:35 -07:00
ras
regulator Merge remote-tracking branch 'regulator/topic/vctrl' into regulator-next 2017-04-30 22:17:44 +09:00
remoteproc virtio: fixes, cleanups, performance 2017-05-10 11:33:08 -07:00
reset ARM: SoC driver updates 2017-05-09 10:01:15 -07:00
rpmsg virtio: fixes, cleanups, performance 2017-05-10 11:33:08 -07:00
rtc RTC for 4.12 2017-05-10 19:37:14 -07:00
s390 virtio: fixes, cleanups, performance 2017-05-10 11:33:08 -07:00
sbus
scsi Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2017-05-12 11:44:13 -07:00
sfi
sh
sn
soc powerpc updates for 4.12 part 2 2017-05-12 10:04:09 -07:00
spi
spmi
ssb
staging Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2017-05-12 11:44:13 -07:00
tc
tee TEE driver infrastructure and OP-TEE drivers 2017-05-10 11:20:09 -07:00
thermal Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2017-05-12 11:58:45 -07:00
thunderbolt
tty drivers/serial: Add driver for Aspeed virtual UART 2017-05-18 16:19:16 +02:00
uio
usb DeviceTree for 4.12: 2017-05-05 19:33:07 -07:00
uwb
vfio powerpc updates for 4.12 part 1. 2017-05-05 11:36:44 -07:00
vhost mm: support __GFP_REPEAT in kvmalloc_node for >32kB 2017-05-08 17:15:12 -07:00
video fbdev changes for v4.12: 2017-05-11 11:12:26 -07:00
virt drivers/virt/fsl_hypervisor.c: use get_user_pages_unlocked() 2017-05-08 17:15:10 -07:00
virtio virtio: allow extra context per descriptor 2017-05-02 23:41:43 +03:00
vlynq
vme
w1
watchdog Annotation of module parameters that specify device settings 2017-05-10 19:13:03 -07:00
xen Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-05-09 09:12:53 -07:00
zorro
Kconfig
Makefile TEE driver infrastructure and OP-TEE drivers 2017-05-10 11:20:09 -07:00