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c5ca95b507
linux/arch/arm
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Ezequiel Garcia c5ca95b507 ARM: 7930/1: Introduce atomic MMIO modify 
Some SoC have MMIO regions that are shared across orthogonal
subsystems. This commit implements a possible solution for the
thread-safe access of such regions through a spinlock-protected API.

Concurrent access is protected with a single spinlock for the
entire MMIO address space. While this protects shared-registers,
it also serializes access to unrelated/unshared registers.

We add relaxed and non-relaxed variants, by using writel_relaxed and writel,
respectively. The rationale for this is that some users may not require
register write completion but only thread-safe access to a register.

Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2014-01-28 14:06:25 +00:00
..
boot ARM: 7877/1: use built-in byte swap function 2013-12-29 12:32:45 +00:00
common ARM: 7921/1: mcpm: remove redundant dsb instructions prior to sev 2013-12-29 12:32:44 +00:00
configs ARM: multi_v7_defconfig: enable SDHCI_BCM_KONA and MMC_BLOCK_MINORS=16 2013-12-03 12:39:14 -08:00
crypto ARM: add .gitignore entry for aesbs-core.S 2013-10-07 15:43:53 +01:00
include ARM: 7930/1: Introduce atomic MMIO modify 2014-01-28 14:06:25 +00:00
kernel ARM: 7930/1: Introduce atomic MMIO modify 2014-01-28 14:06:25 +00:00
kvm Fix percpu vmalloc allocations 2013-11-19 10:43:05 +02:00
lib ARM: 7877/1: use built-in byte swap function 2013-12-29 12:32:45 +00:00
mach-at91 ARM: SoC fixes for 3.13-rc 2013-12-04 08:56:18 -08:00
mach-bcm BCM changes for 3.13/soc. A number of cleanup related changes. 2013-10-30 14:03:39 -07:00
mach-bcm2835 Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-12 10:02:59 +09:00
mach-clps711x ARM: clps711x: Use linux/sched_clock.h 2013-10-11 14:50:10 -07:00
mach-cns3xxx
mach-davinci This pull request includes a patch 2013-12-04 14:28:26 -08:00
mach-dove ARM: driver updates for 3.13 2013-11-11 17:05:37 +09:00
mach-ebsa110
mach-ep93xx usb: ohci: remove ep93xx bus glue platform driver 2013-10-29 16:43:37 -07:00
mach-exynos ACPI and power management updates for 3.13-rc1 2013-11-14 13:41:48 +09:00
mach-footbridge ARM: footbridge: cleanup LEDs code 2013-12-29 12:36:44 +00:00
mach-gemini GPIO bulk changes for the v3.13 development cycle 2013-11-12 15:50:46 +09:00
mach-highbank ARM: highbank: handle soft poweroff and reset key events 2013-12-04 09:28:50 -08:00
mach-imx Fix select-induced Kconfig warning for ZBOOT_ROM 2014-01-21 16:42:05 +00:00
mach-integrator Few clock fixes, a runtime PM fix, and pinctrl-single fix along 2013-11-15 15:17:59 -08:00
mach-iop13xx dmaengine: remove DMA unmap from drivers 2013-11-14 11:04:38 -08:00
mach-iop32x ARM: plat-iop: pass physical base for GPIO 2013-09-20 23:05:19 +02:00
mach-iop33x ARM: plat-iop: pass physical base for GPIO 2013-09-20 23:05:19 +02:00
mach-ixp4xx Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-11-14 08:51:29 +09:00
mach-keystone DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
mach-kirkwood Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2013-11-18 15:50:07 -08:00
mach-ks8695
mach-lpc32xx
mach-mmp fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
mach-msm Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-12 10:36:00 +09:00
mach-mv78xx0 ARM: SoC platform changes for 3.12 2013-09-06 13:30:06 -07:00
mach-mvebu ARM: mvebu: support running big-endian 2013-10-19 20:46:34 +01:00
mach-mxs ARM: SoC DT updates for 3.13 2013-11-11 17:34:56 +09:00
mach-netx
mach-nomadik Merge branch 'clk-of-init-v2_for-3.13' of https://github.com/shesselba/linux-dove into next/cleanup 2013-10-07 09:47:31 -07:00
mach-nspire ARM: nspire: remove custom .init_time hook 2013-09-29 21:09:37 +02:00
mach-omap1 Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2013-11-18 15:50:07 -08:00
mach-omap2 Revert "ARM: OMAP2+: Remove legacy mux code for display.c" 2013-12-17 16:28:34 -08:00
mach-orion5x ARM: SoC board updates for 3.12 2013-09-06 13:34:43 -07:00
mach-picoxcell
mach-prima2 ARM: prima2: remove custom .init_time hook 2013-09-29 21:09:38 +02:00
mach-pxa ARM: pxa: prevent PXA270 occasional reboot freezes 2013-12-11 16:35:16 -08:00
mach-realview ARM: SoC cleanups for 3.12 2013-09-06 13:21:16 -07:00
mach-rockchip ARM: SoC board updates for 3.13 2013-11-11 16:57:16 +09:00
mach-rpc
mach-s3c24xx Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2013-11-18 15:50:07 -08:00
mach-s3c64xx ARM: s3c64xx: dt: Fix boot failure due to double clock initialization 2013-12-13 21:48:25 -08:00
mach-s5p64x0 ARM: SAMSUNG: Initialize PWM backlight enable_gpio field 2013-10-16 09:05:57 +02:00
mach-s5pc100 ARM: SAMSUNG: Initialize PWM backlight enable_gpio field 2013-10-16 09:05:57 +02:00
mach-s5pv210 pwm: Changes for v3.13-rc1 2013-11-16 12:21:40 -08:00
mach-sa1100 ACPI and power management updates for 3.13-rc1 2013-11-14 13:41:48 +09:00
mach-shmobile ARM: shmobile: lager: phy fixup needs CONFIG_PHYLIB 2013-11-24 15:53:27 +09:00
mach-socfpga arm: socfpga: Enable ARM_TWD for socfpga 2013-12-03 14:19:48 -08:00
mach-spear ARM: drop explicit selection of HAVE_CLK and CLKDEV_LOOKUP 2013-10-07 10:41:32 -07:00
mach-sti ARM: SoC fixes for 3.13 merge window 2013-11-16 12:45:55 -08:00
mach-sunxi ARM: sunxi: remove .init_time hooks 2013-10-28 10:19:45 -07:00
mach-tegra ARM: tegra: add missing break to fuse initialization code 2013-12-11 17:09:11 -08:00
mach-u300 DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
mach-ux500 Revert "ARM: ux500: Stop passing MMC's platform data for Device Tree boots" 2013-11-26 21:02:20 +01:00
mach-versatile Merge branch 'versatile/fixes' into fixes 2013-09-09 17:31:04 -07:00
mach-vexpress ARM: vexpress/TC2: Implement MCPM power_down_finish() 2013-11-25 14:12:14 -08:00
mach-virt
mach-vt8500 ARM: drop explicit selection of HAVE_CLK and CLKDEV_LOOKUP 2013-10-07 10:41:32 -07:00
mach-w90x900 ARM: w90x900: delete <mach/gpio.h> 2013-10-01 10:33:02 +02:00
mach-zynq ACPI and power management updates for 3.13-rc1 2013-11-14 13:41:48 +09:00
mm ARM: 7926/1: mm: flesh out and fix the comments in the ASID allocator 2013-12-29 12:46:49 +00:00
net Merge branch 'devel-stable' into for-next 2013-11-12 10:58:59 +00:00
nwfpe
oprofile
plat-iop ARM: plat-iop: move the GPIO driver to drivers/gpio 2013-09-20 23:03:36 +02:00
plat-omap ARM: OMAP2+: Disable POSTED mode for errata i103 and i767 2013-11-26 15:03:36 -08:00
plat-orion
plat-pxa ARM: pxa: ssp: Check return values from phandle lookups 2013-09-09 17:14:09 -07:00
plat-samsung pwm: Changes for v3.13-rc1 2013-11-16 12:21:40 -08:00
plat-versatile ARM: vexpress: add big endian support 2013-10-19 20:46:34 +01:00
tools
vfp ARM: 7873/1: vfp: clear vfp_current_hw_state for dying cpu 2013-10-30 22:10:10 +00:00
xen arm: xen: foreign mapping PTEs are special. 2013-12-11 17:06:05 +00:00
Kconfig Fix select-induced Kconfig warning for ZBOOT_ROM 2014-01-21 16:42:05 +00:00
Kconfig-nommu
Kconfig.debug ARM: 7932/1: bcm: Add DEBUG_LL console support 2013-12-29 12:47:44 +00:00
Makefile Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-11-14 08:51:29 +09:00