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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
..
.gitignore
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Makefile ARM: add uprobes support 2014-03-18 16:39:40 -04:00
arch_timer.c arch_timer: Move to generic sched_clock framework 2013-10-09 16:54:10 -07:00
armksyms.c ARM: Better virt_to_page() handling 2014-04-03 22:46:34 +01:00
arthur.c
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asm-offsets.c ARM: KVM: introduce per-vcpu HYP Configuration Register 2014-03-03 01:15:23 +00:00
atags.h ARM: constify machine_desc structure uses 2013-07-26 14:55:59 +01:00
atags_compat.c
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atags_parse.c ARM: constify machine_desc structure uses 2013-07-26 14:55:59 +01:00
atags_proc.c procfs: new helper - PDE_DATA(inode) 2013-04-09 14:13:32 -04:00
bios32.c Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2014-04-05 13:20:43 -07:00
calls.S ARM: add renameat2 syscall 2014-04-23 11:27:42 +01:00
cpuidle.c
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crash_dump.c ARM: 8012/1: kdump: Avoid overflow when converting pfn to physaddr 2014-04-07 12:10:00 +01:00
debug.S ARM: compile fix for DEBUG_LL=y && MMU=n 2013-01-16 14:30:06 -08:00
devtree.c ARM: Introduce CPU_METHOD_OF_DECLARE() for cpu hotplug/smp 2014-02-11 15:00:37 -06:00
dma-isa.c
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dma.c
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early_printk.c early_printk: consolidate random copies of identical code 2013-04-29 18:28:13 -07:00
elf.c
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entry-armv.S ARM: 7946/1: asm: __und_usr_thumb need byteswap instructions in BE case 2014-01-28 14:34:02 +00:00
entry-common.S ARM: asm: Add ARM_BE8() assembly helper 2013-10-19 20:46:33 +01:00
entry-header.S ARM: 8017/1: Move asm macro get_thread_info to asm/assembler.h 2014-04-09 13:08:07 +01:00
entry-v7m.S ARM: 7890/1: v7-M: drop using mach/entry-macro.S 2013-12-29 12:32:32 +00:00
etm.c ARM: 7905/1: etm: Remove unnecessary amba_set_drvdata() 2013-12-29 12:32:34 +00:00
fiq.c ARM: 7819/1: fiq: Cast the first argument of flush_icache_range() 2013-08-20 00:11:50 +01:00
fiqasm.S
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ftrace.c ftrace: Do not pass data to ftrace_dyn_arch_init 2014-03-07 10:06:14 -05:00
head-common.S ARM: 7980/1: kernel: improve error message when LPAE config doesn't match CPU 2014-02-21 11:56:32 +00:00
head-nommu.S ARM: fix asm/memory.h build error 2013-12-13 20:25:30 +00:00
head.S ARM: 8033/1: fix big endian __pv_phys_pfn_offset size related issue 2014-04-22 22:24:00 +01:00
hw_breakpoint.c CPU hotplug notifiers registration fixes for 3.15-rc1 2014-04-07 14:55:46 -07:00
hyp-stub.S ARM: 7786/1: hyp: fix macro parameterisation 2013-07-22 14:30:34 +01:00
insn.c
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insn.h
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io.c ARM: 7930/1: Introduce atomic MMIO modify 2014-01-28 14:06:25 +00:00
irq.c ARM: irq: Call irqchip_init if no init_irq function is specified 2013-04-02 11:05:40 -07:00
isa.c
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iwmmxt.S ARM: 8038/1: iwmmxt: explicitly check for supported architectures 2014-04-25 12:07:32 +01:00
jump_label.c
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kgdb.c
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kprobes-arm.c ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
kprobes-common.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
kprobes-test-arm.c ARM: kprobes-test: use <asm/opcodes.h> for ARM instruction building 2014-04-01 16:48:24 +03:00
kprobes-test-thumb.c ARM: kprobes-test: use <asm/opcodes.h> for Thumb instruction building 2014-04-01 16:48:26 +03:00
kprobes-test.c ARM: kprobes-test: Workaround GAS .align bug 2014-04-01 16:48:27 +03:00
kprobes-test.h ARM: kprobes-test: Workaround GAS .align bug 2014-04-01 16:48:27 +03:00
kprobes-thumb.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
kprobes.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
kprobes.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
machine_kexec.c ARM: 8030/1: ARM : kdump : add arch_crash_save_vmcoreinfo 2014-04-22 22:23:58 +01:00
module.c Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-11-14 08:51:29 +09:00
opcodes.c
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patch.c
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patch.h
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perf_event.c ARM: perf: hook up perf_sample_event_took around pmu irq handling 2014-02-21 11:11:21 +00:00
perf_event_cpu.c ARM: perf: add support for the Cortex-A12 PMU 2014-02-21 11:11:23 +00:00
perf_event_v6.c ARM: perf: don't pretend to support counting of L1I writes 2013-01-16 12:01:59 +00:00
perf_event_v7.c ARM: perf: add support for the Cortex-A12 PMU 2014-02-21 11:11:23 +00:00
perf_event_xscale.c ARM: perf: don't pretend to support counting of L1I writes 2013-01-16 12:01:59 +00:00
perf_regs.c ARM: perf: add support for perf registers API 2013-09-30 16:41:50 +01:00
pj4-cp0.c ARM: 8040/1: pj4: properly detect existence of iWMMXt coprocessor 2014-04-25 12:07:34 +01:00
probes-arm.c ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
probes-arm.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
probes-thumb.c ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
probes-thumb.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
probes.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
probes.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
process.c Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2014-04-11 11:56:40 -07:00
psci.c arm: introduce psci_smp_ops 2013-05-21 14:24:11 +00:00
psci_smp.c ARM: PSCI: remove unnecessary include of arm-gic.h 2013-10-01 16:34:10 -05:00
ptrace.c ptrace/arm: revert "hw_breakpoints: Fix racy access to ptrace breakpoints" 2013-07-09 10:33:25 -07:00
relocate_kernel.S ARM: 7897/1: kexec: Use the right ISA for relocate_new_kernel 2013-11-30 22:21:02 +00:00
return_address.c ARM: 7676/1: fix a wrong value returned from CALLER_ADDRn 2013-03-19 11:43:46 +00:00
setup.c Merge branches 'amba', 'fixes', 'misc', 'mmci', 'unstable/omap-dma' and 'unstable/sa11x0' into for-next 2014-04-04 00:33:32 +01:00
signal.c ARM: add uprobes support 2014-03-18 16:39:40 -04:00
sigreturn_codes.S ARM: 7895/1: signal: fix armv7-m build issue in sigreturn_codes.S 2013-11-30 22:21:00 +00:00
sleep.S Merge branch 'baserock/bjdooks/312-rc4/be/core-v3' of git://git.baserock.org/delta/linux into devel-stable 2013-10-30 22:20:26 +00:00
smp.c cpufreq: remove unused notifier: CPUFREQ_{SUSPENDCHANGE|RESUMECHANGE} 2014-03-19 14:10:24 +01:00
smp_scu.c ARM: smp_scu: data endian fixes 2013-10-19 20:46:33 +01:00
smp_tlb.c ARM: 7855/1: Add check for Cortex-A15 errata 798181 ECO 2013-10-29 11:06:13 +00:00
smp_twd.c cpufreq: remove unused notifier: CPUFREQ_{SUSPENDCHANGE|RESUMECHANGE} 2014-03-19 14:10:24 +01:00
stacktrace.c ARM: 7913/1: fix framepointer check in unwind_frame 2013-12-09 23:24:33 +00:00
suspend.c ARM: suspend: use hash of cpu_logical_map value to index into save array 2013-07-30 09:00:43 -04:00
swp_emulate.c arm: single_open() leaks 2013-05-05 00:07:22 -04:00
sys_arm.c
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sys_oabi-compat.c locks: add new fcntl cmd values for handling file private locks 2014-03-31 08:24:43 -04:00
tcm.c ARM: add permission annotations to MT_MEMORY* mapping types 2013-12-11 09:53:14 +00:00
thumbee.c
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time.c ARM: call of_clk_init from default time_init handler 2013-09-29 21:09:15 +02:00
topology.c ARM: 7920/1: topology: Staticise non-exported symbols 2013-12-29 12:32:42 +00:00
traps.c Dump the registers on undefined instruction userspace faults 2014-04-11 14:48:39 +01:00
unwind.c ARM: 7987/1: ARM : unwinder : Prevent data abort due to stack overflow 2014-02-25 11:48:24 +00:00
uprobes-arm.c ARM: add uprobes support 2014-03-18 16:39:40 -04:00
uprobes.c ARM: add uprobes support 2014-03-18 16:39:40 -04:00
uprobes.h ARM: add uprobes support 2014-03-18 16:39:40 -04:00
v7m.c ARM: 7828/1: ARMv7-M: implement restart routine common to all v7-M machines 2013-09-02 13:49:29 +01:00
vmlinux.lds.S ARM: use linker magic for vectors and vector stubs 2013-07-31 21:34:24 +01:00
xscale-cp0.c
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