Wilken Gottwalt 3c881e05c8 hwspinlock: add sun6i hardware spinlock support ... Adds the sun6i_hwspinlock driver for the hardware spinlock unit found in most of the sun6i compatible SoCs. This unit provides at least 32 spinlocks in hardware. The implementation supports 32, 64, 128 or 256 32bit registers. A lock can be taken by reading a register and released by writing a 0 to it. This driver supports all 4 spinlock setups, but for now only the first setup (32 locks) seem to exist in available devices. This spinlock unit is shared between all ARM cores and the embedded companion core. All of them can take/release a lock with a single cycle operation. It can be used to sync access to devices shared by the ARM cores and the companion core. There are two ways to check if a lock is taken. The first way is to read a lock. If a 0 is returned, the lock was free and is taken now. If an 1 is returned, the caller has to try again. Which means the lock is taken. The second way is to read a 32bit wide status register where every bit represents one of the 32 first locks. According to the datasheets this status register supports only the 32 first locks. This is the reason the first way (lock read/write) approach is used to be able to cover all 256 locks in future devices. The driver also reports the amount of supported locks via debugfs. Reviewed-by: Samuel Holland <samuel@sholland.org> Acked-by: Maxime Ripard <maxime@cerno.tech> Signed-off-by: Wilken Gottwalt <wilken.gottwalt@posteo.net> Link: https://lore.kernel.org/r/bfd2b97307c2321b15c09683f4bd5e1fcc792f13.1615713499.git.wilken.gottwalt@posteo.net Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>		2021-05-27 22:19:42 -05:00
..
accessibility	TTY/Serial driver updates for 5.13-rc1	2021-04-26 11:20:10 -07:00
acpi	Assorted arm64 fixes and clean-ups, the most important:	2021-05-07 12:11:05 -07:00
amba
android	selinux/stable-5.13 PR 20210426	2021-04-27 13:42:11 -07:00
ata	pci-v5.13-changes	2021-05-05 13:24:11 -07:00
atm	atm: firestream: Use fallthrough pseudo-keyword	2021-05-07 16:01:08 -07:00
auxdisplay	treewide: remove editor modelines and cruft	2021-05-07 00:26:34 -07:00
base	init/initramfs.c: do unpacking asynchronously	2021-05-07 00:26:33 -07:00
bcma	bcma: remove unused function	2021-04-18 09:36:56 +03:00
block	block-5.13-2021-05-07	2021-05-07 11:35:12 -07:00
bluetooth	Networking changes for 5.13.	2021-04-29 11:57:23 -07:00
bus	ARM: SoC drivers for v5.13	2021-04-26 12:11:52 -07:00
cdrom
char	drivers/char: remove /dev/kmem for good	2021-05-07 00:26:34 -07:00
clk	pci-v5.13-changes	2021-05-05 13:24:11 -07:00
clocksource	ARM:	2021-05-01 10:14:08 -07:00
comedi
connector
counter
cpufreq	Power management updates for 5.13-rc1	2021-04-26 15:10:25 -07:00
cpuidle
crypto	ARM:	2021-05-01 10:14:08 -07:00
cxl	cxl/mem: Fix memory device capacity probing	2021-04-16 18:21:56 -07:00
dax
dca
devfreq
dio
dma	dmaengine updates for v5.13-rc1	2021-05-04 11:24:46 -07:00
dma-buf
edac
eisa
extcon	- Core Frameworks	2021-04-28 15:59:13 -07:00
firewire	The usual updates from the irq departement:	2021-04-26 09:43:16 -07:00
firmware	Assorted arm64 fixes and clean-ups, the most important:	2021-05-07 12:11:05 -07:00
fpga	ARM: SoC drivers for v5.13	2021-04-26 12:11:52 -07:00
fsi
gnss
gpio	gpio updates for v5.13	2021-05-05 12:39:29 -07:00
gpu	drm fixes for 5.13-rc1	2021-05-09 13:42:39 -07:00
greybus
hid	Merge branch 'for-5.13/warnings' into for-linus	2021-04-29 21:47:22 +02:00
hsi
hv	printk changes for 5.13	2021-04-27 18:09:44 -07:00
hwmon	ACPI updates for 5.13-rc1	2021-04-26 15:03:23 -07:00
hwspinlock	hwspinlock: add sun6i hardware spinlock support	2021-05-27 22:19:42 -05:00
hwtracing	ARM:	2021-05-01 10:14:08 -07:00
i2c	Merge branch 'i2c/for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2021-04-30 13:01:02 -07:00
i3c	Revert "i3c master: fix missing destroy_workqueue() on error in i3c_master_register"	2021-04-24 22:21:01 +02:00
ide
idle
iio	spi: Updates for v5.13	2021-04-26 16:32:11 -07:00
infiniband	block-5.13-2021-05-07	2021-05-07 11:35:12 -07:00
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2021-05-06 23:37:55 -07:00
interconnect	CFI on arm64 series for v5.13-rc1	2021-04-27 10:16:46 -07:00
iommu	pci-v5.13-changes	2021-05-05 13:24:11 -07:00
ipack
irqchip	ARM:	2021-05-01 10:14:08 -07:00
isdn	proc: mandate ->proc_lseek in "struct proc_ops"	2021-05-06 19:24:11 -07:00
leds	Nothing too exciting here, just some fixes.	2021-05-03 12:23:03 -07:00
lightnvm
macintosh
mailbox	- qcom: enable support for SM8350 and SC7280	2021-04-28 16:10:33 -07:00
mcb
md	Merge branch 'akpm' (patches from Andrew)	2021-05-07 00:34:51 -07:00
media	Merge branch 'akpm' (patches from Andrew)	2021-05-07 00:34:51 -07:00
memory	.gitignore: prefix local generated files with a slash	2021-05-02 00:43:35 +09:00
memstick	memstick: r592: ignore kfifo_out() return code again	2021-04-26 11:08:23 +02:00
message
mfd	- Core Frameworks	2021-04-28 15:59:13 -07:00
misc	IOMMU Updates for Linux v5.13	2021-05-01 09:33:00 -07:00
mmc	MMC core:	2021-04-28 15:56:51 -07:00
most	Staging/IIO driver updates for 5.13-rc1	2021-04-26 11:14:21 -07:00
mtd	This pull request contains changes for JFFS2, UBI and UBIFS	2021-05-04 18:08:40 -07:00
mux
net	Networking fixes for 5.13-rc1, including fixes from bpf, can	2021-05-08 08:31:46 -07:00
nfc
ntb
nubus
nvdimm	include: remove pagemap.h from blkdev.h	2021-05-06 19:24:11 -07:00
nvme	nvmet: remove unsupported command noise	2021-05-04 09:39:26 +02:00
nvmem
of	of: overlay: Remove redundant assignment to ret	2021-05-03 13:57:56 -05:00
opp
parisc
parport	treewide: remove editor modelines and cruft	2021-05-07 00:26:34 -07:00
pci	more s390 updates for 5.13 merge window	2021-05-06 14:39:50 -07:00
pcmcia
perf	ARM:	2021-05-01 10:14:08 -07:00
phy	Networking changes for 5.13.	2021-04-29 11:57:23 -07:00
pinctrl	linux/kconfig.h: replace IF_ENABLED() with PTR_IF() in <linux/kernel.h>	2021-05-09 00:29:45 +09:00
platform	chrome platform changes for 5.13	2021-05-07 14:49:18 -07:00
pnp
power	power supply and reset changes for the v5.13 series	2021-04-28 15:43:58 -07:00
powercap
pps	TTY/Serial driver updates for 5.13-rc1	2021-04-26 11:20:10 -07:00
ps3
ptp	ARM:	2021-05-01 10:14:08 -07:00
pwm	pwm: Changes for v5.13-rc1	2021-05-05 12:53:16 -07:00
rapidio
ras
regulator	- Core Frameworks	2021-04-28 15:59:13 -07:00
remoteproc	remoteproc updates for v5.13	2021-05-04 11:13:33 -07:00
reset	pci-v5.13-changes	2021-05-05 13:24:11 -07:00
rpmsg
rtc	RTC for 5.13	2021-05-03 12:15:21 -07:00
s390	block-5.13-2021-05-07	2021-05-07 11:35:12 -07:00
sbus
scsi	SCSI misc on 20210508	2021-05-08 10:44:36 -07:00
sh	The usual updates from the irq departement:	2021-04-26 09:43:16 -07:00
siox
slimbus
soc	IOMMU Updates for Linux v5.13	2021-05-01 09:33:00 -07:00
soundwire
spi	sound updates for 5.13	2021-04-30 12:48:14 -07:00
spmi
ssb
staging	drm tegra-next + fixes for 5.13-rc1	2021-04-30 12:44:02 -07:00
target	SCSI misc on 20210508	2021-05-08 10:44:36 -07:00
tc
tee	ARM: SoC drivers for v5.13	2021-04-26 12:11:52 -07:00
thermal	- Remove duplicate error message for the amlogic driver (Tang Bin)	2021-05-05 12:46:48 -07:00
thunderbolt
tty	.gitignore: prefix local generated files with a slash	2021-05-02 00:43:35 +09:00
uio
usb	SCSI misc on 20210428	2021-04-28 17:22:10 -07:00
vdpa	vDPA/ifcvf: get_config_size should return dev specific config size	2021-05-03 04:55:54 -04:00
vfio	IOMMU Updates for Linux v5.13	2021-05-01 09:33:00 -07:00
vhost	virtio,vhost,vdpa: features, fixes	2021-05-05 13:31:39 -07:00
video	fbmem: fix horribly incorrect placement of __maybe_unused	2021-05-09 14:03:33 -07:00
virt	nitro_enclaves: Fix stale file descriptors on failed usercopy	2021-04-29 19:06:49 +02:00
virtio	virtio_pci_modern: correct sparse tags for notify	2021-05-04 04:19:59 -04:00
visorbus
vlynq
vme
w1
watchdog	- Core Frameworks	2021-04-28 15:59:13 -07:00
xen	Merge branch 'stable/for-linus-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb	2021-05-04 10:58:49 -07:00
zorro
Kconfig
Makefile	virtio,vhost,vdpa: features, fixes	2021-05-05 13:31:39 -07:00