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ARM: ARMv7-M: implement read_cpuid_ext

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On v7-M the extended cpuid registers are not available from CP15 but they
are memory mapped in the System Control Space.
There isn't an equivalent available for CPUID_{CACHETYPE,TCM,TLBTYPE,MPIDR}.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
This commit is contained in:
Uwe Kleine-König 2013-05-06 11:35:42 +02:00
parent 4477ca45fb
commit 6fae9cdafc
2 changed files with 35 additions and 5 deletions
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38
arch/arm/include/asm/cputype.h
View File

@ -10,6 +10,22 @@
#define CPUID_TLBTYPE 3
#define CPUID_MPIDR 5
#ifdef CONFIG_CPU_V7M
#define CPUID_EXT_PFR0 0x40
#define CPUID_EXT_PFR1 0x44
#define CPUID_EXT_DFR0 0x48
#define CPUID_EXT_AFR0 0x4c
#define CPUID_EXT_MMFR0 0x50
#define CPUID_EXT_MMFR1 0x54
#define CPUID_EXT_MMFR2 0x58
#define CPUID_EXT_MMFR3 0x5c
#define CPUID_EXT_ISAR0 0x60
#define CPUID_EXT_ISAR1 0x64
#define CPUID_EXT_ISAR2 0x68
#define CPUID_EXT_ISAR3 0x6c
#define CPUID_EXT_ISAR4 0x70
#define CPUID_EXT_ISAR5 0x74
#else
#define CPUID_EXT_PFR0 "c1, 0"
#define CPUID_EXT_PFR1 "c1, 1"
#define CPUID_EXT_DFR0 "c1, 2"
@ -24,6 +40,7 @@
#define CPUID_EXT_ISAR3 "c2, 3"
#define CPUID_EXT_ISAR4 "c2, 4"
#define CPUID_EXT_ISAR5 "c2, 5"
#endif
#define MPIDR_SMP_BITMASK (0x3 << 30)
#define MPIDR_SMP_VALUE (0x2 << 30)
@ -79,7 +96,23 @@ extern unsigned int processor_id;
__val; \
})
#else /* ifdef CONFIG_CPU_CP15 */
#elif defined(CONFIG_CPU_V7M)
#include <asm/io.h>
#include <asm/v7m.h>
#define read_cpuid(reg) \
({ \
WARN_ON_ONCE(1); \
0; \
})
static inline unsigned int __attribute_const__ read_cpuid_ext(unsigned offset)
{
return readl(BASEADDR_V7M_SCB + offset);
}
#else /* ifdef CONFIG_CPU_CP15 / elif defined (CONFIG_CPU_V7M) */
/*
* read_cpuid and read_cpuid_ext should only ever be called on machines that
@ -108,9 +141,6 @@ static inline unsigned int __attribute_const__ read_cpuid_id(void)
#elif defined(CONFIG_CPU_V7M)
#include <asm/io.h>
#include <asm/v7m.h>
static inline unsigned int __attribute_const__ read_cpuid_id(void)
{
return readl(BASEADDR_V7M_SCB + V7M_SCB_CPUID);

2
arch/arm/mm/proc-v7m.S
View File

@ -144,7 +144,7 @@ __v7m_proc_info:
b __v7m_setup @ proc_info_list.__cpu_flush
.long cpu_arch_name
.long cpu_elf_name
.long HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_IDIVT
.long HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT
.long cpu_v7m_name
.long v7m_processor_functions @ proc_info_list.proc
.long 0 @ proc_info_list.tlb