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linux-stable/arch/arm
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Sebastian Hesselbarth e89f443b18 ARM: 8040/1: pj4: properly detect existence of iWMMXt coprocessor 
commit fdb487f5c9
  ("ARM: 8015/1: Add cpu_is_pj4 to distinguish PJ4 because it
    has some differences with V7")
introduced a fix for checking PJ4 cpuid to not use PJ4 specific
coprocessor access on non-PJ4 platforms.

Unfortunately, this in turn broke Marvell Armada 370/XP, both
comprising Marvell PJ4B CPUs without iWMMXt extension. Instead
of only checking for cpuid, which may not be sufficient to
determine iWMMXt support, the presence of iWMMXt coprocessors
can be checked by enabling and reading the Coprocessor ID
register (wCID, register 0 of CP1).

Therefore this adds an explicit check for the presence and correct
wCID value, before enabling iWMMXt capabilities. As a bonus, also
print the iWMMXt version of a detected coprocessor.

This has been tested to properly detect iWMMXt presence/absence on:
- PJ4,  CPUID 0x560f5815, wCID 0x56052001: Marvell Dove, iWMMXt v2
- PJ4B, CPUID 0x561f5811: Marvell Armada 370, no iWMMXt
- PJ4B, CPUID 0x562f5841, wCID 0x56052001: Marvell Armada 1500, iWMMXt v2
- PJ4B, CPUID 0x562f5842: Marvell Armada XP, no iWMMXt

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tested-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2014-04-25 12:07:34 +01:00
..
boot Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2014-04-10 08:55:08 -07:00
common ARM: 8032/1: bL_switcher: fix validation check before its activation 2014-04-22 22:23:59 +01:00
configs MMC highlights for 3.15: 2014-04-09 08:39:39 -07:00
crypto
firmware
include ARM: add renameat2 syscall 2014-04-23 11:27:42 +01:00
kernel ARM: 8040/1: pj4: properly detect existence of iWMMXt coprocessor 2014-04-25 12:07:34 +01:00
kvm CPU hotplug notifiers registration fixes for 3.15-rc1 2014-04-07 14:55:46 -07:00
lib ARM: 7990/1: asm: rename logical shift macros push pull into lspush lspull 2014-02-25 11:33:57 +00:00
mach-at91 ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-bcm ARM: SoC specific changes 2014-04-05 14:19:54 -07:00
mach-berlin
mach-clps711x ARM: SoC specific changes 2014-04-05 14:19:54 -07:00
mach-cns3xxx ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-davinci ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
mach-dove ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
mach-ebsa110 ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-efm32 ARM: efm32: drop unused file <mach/timex.h> 2014-02-24 10:07:27 +01:00
mach-ep93xx ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-exynos ARM: SoC: late cleanups 2014-04-05 15:46:37 -07:00
mach-footbridge ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-gemini ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-highbank
mach-hisi ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-imx ARM: SoC specific changes 2014-04-05 14:19:54 -07:00
mach-integrator ARM: SoC: late cleanups 2014-04-05 15:46:37 -07:00
mach-iop13xx
mach-iop32x This cleanup series gets rid of <mach/timex.h> for platforms not using 2014-02-24 10:06:56 +01:00
mach-iop33x
mach-ixp4xx ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-keystone ARM: SoC: device tree changes 2014-04-05 15:29:04 -07:00
mach-kirkwood ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
mach-ks8695 ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-lpc32xx ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-mmp ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-moxart ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-msm ARM: SoC specific changes 2014-04-05 14:19:54 -07:00
mach-mv78xx0 ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
mach-mvebu ARM: SoC specific changes 2014-04-05 14:19:54 -07:00
mach-mxs ARM: SoC: device tree changes 2014-04-05 15:29:04 -07:00
mach-netx ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-nomadik
mach-nspire ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-omap1 ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-omap2 fbdev changes for 3.15 (OMAP) 2014-04-07 10:47:51 -07:00
mach-orion5x ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
mach-picoxcell Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP 2014-04-07 16:36:11 -07:00
mach-prima2 Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP 2014-04-07 16:36:11 -07:00
mach-pxa pwm: Changes for v3.15-rc1 2014-04-05 18:32:31 -07:00
mach-qcom
mach-realview ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-rockchip i.MX SoC changes for 3.15: 2014-03-09 12:03:18 -07:00
mach-rpc ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-s3c24xx Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP 2014-04-07 16:36:11 -07:00
mach-s3c64xx ARM: SoC: late cleanups 2014-04-05 15:46:37 -07:00
mach-s5p64x0 ARM: SoC: late cleanups 2014-04-05 15:46:37 -07:00
mach-s5pc100 ARM: SoC: late cleanups 2014-04-05 15:46:37 -07:00
mach-s5pv210 ARM: SoC: late cleanups 2014-04-05 15:46:37 -07:00
mach-sa1100 ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-shmobile Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP 2014-04-07 16:36:11 -07:00
mach-socfpga The clock framework changes for 3.15 look similar to past pull requests. 2014-04-05 18:39:18 -07:00
mach-spear ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-sti Merge branch 'cleanup/kconfig' into next/drivers 2014-03-18 16:25:47 +01:00
mach-sunxi ARM: SoC specific changes 2014-04-05 14:19:54 -07:00
mach-tegra ARM: SoC specific changes 2014-04-05 14:19:54 -07:00
mach-u300 ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-ux500 ARM: SoC: device tree changes 2014-04-05 15:29:04 -07:00
mach-versatile ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
mach-vexpress Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2014-04-11 11:56:40 -07:00
mach-vt8500
mach-w90x900 ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00
mach-zynq ARM: SoC: late cleanups 2014-04-05 15:46:37 -07:00
mm ARM: keep arch/arm/Kconfig and arch/arm/mm/Kconfig select entries sorted 2014-04-23 09:31:10 +01:00
net net: filter: add jited flag to indicate jit compiled filters 2014-03-31 00:45:08 -04:00
nwfpe
oprofile
plat-iop ARM: 8000/1: misc: remove deprecated IRQF_DISABLED 2014-03-12 10:32:38 +00:00
plat-omap ARM: SoC: device tree changes 2014-04-05 15:29:04 -07:00
plat-orion ARM: SoC: driver changes 2014-04-05 15:37:40 -07:00
plat-pxa
plat-samsung Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP 2014-04-07 16:36:11 -07:00
plat-versatile
tools
vfp ARM: 8026/1: Fix emulation of multiply accumulate instructions 2014-04-14 23:28:24 +01:00
xen xen/grant-table: Refactor gnttab_[un]map_refs to avoid m2p_override 2014-03-18 14:40:19 +00:00
Kconfig ARM: keep arch/arm/Kconfig and arch/arm/mm/Kconfig select entries sorted 2014-04-23 09:31:10 +01:00
Kconfig-nommu
Kconfig.debug ARM: 8024/1: Keep DEBUG_UART_{PHYS,VIRT} entries sorted 2014-04-14 23:28:23 +01:00
Makefile ARM: SoC: cleanups for 3.15 2014-04-05 13:51:19 -07:00