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1c83af5f9d
The more modern ColdFire parts (even if based on older version cores) have separate user and supervisor stack pointers (a7 register). Modify the ColdFire CPU setup and exception code to enable and use this on parts that have it. Signed-off-by: Greg Ungerer <gerg@uclinux.org>
123 lines
3.9 KiB
C
123 lines
3.9 KiB
C
/*
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* Bit definitions for the MCF54xx ACR and CACR registers.
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*/
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#ifndef m54xxacr_h
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#define m54xxacr_h
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/*
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* Define the Cache register flags.
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*/
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#define CACR_DEC 0x80000000 /* Enable data cache */
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#define CACR_DWP 0x40000000 /* Data write protection */
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#define CACR_DESB 0x20000000 /* Enable data store buffer */
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#define CACR_DDPI 0x10000000 /* Disable invalidation by CPUSHL */
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#define CACR_DHCLK 0x08000000 /* Half data cache lock mode */
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#define CACR_DDCM_WT 0x00000000 /* Write through cache*/
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#define CACR_DDCM_CP 0x02000000 /* Copyback cache */
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#define CACR_DDCM_P 0x04000000 /* No cache, precise */
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#define CACR_DDCM_IMP 0x06000000 /* No cache, imprecise */
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#define CACR_DCINVA 0x01000000 /* Invalidate data cache */
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#define CACR_BEC 0x00080000 /* Enable branch cache */
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#define CACR_BCINVA 0x00040000 /* Invalidate branch cache */
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#define CACR_IEC 0x00008000 /* Enable instruction cache */
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#define CACR_DNFB 0x00002000 /* Inhibited fill buffer */
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#define CACR_IDPI 0x00001000 /* Disable CPUSHL */
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#define CACR_IHLCK 0x00000800 /* Intruction cache half lock */
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#define CACR_IDCM 0x00000400 /* Intruction cache inhibit */
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#define CACR_ICINVA 0x00000100 /* Invalidate instr cache */
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#define CACR_EUSP 0x00000020 /* Enable separate user a7 */
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#define ACR_BASE_POS 24 /* Address Base */
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#define ACR_MASK_POS 16 /* Address Mask */
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#define ACR_ENABLE 0x00008000 /* Enable address */
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#define ACR_USER 0x00000000 /* User mode access only */
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#define ACR_SUPER 0x00002000 /* Supervisor mode only */
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#define ACR_ANY 0x00004000 /* Match any access mode */
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#define ACR_CM_WT 0x00000000 /* Write through mode */
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#define ACR_CM_CP 0x00000020 /* Copyback mode */
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#define ACR_CM_OFF_PRE 0x00000040 /* No cache, precise */
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#define ACR_CM_OFF_IMP 0x00000060 /* No cache, imprecise */
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#define ACR_CM 0x00000060 /* Cache mode mask */
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#define ACR_WPROTECT 0x00000004 /* Write protect */
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#if defined(CONFIG_M5407)
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#define ICACHE_SIZE 0x4000 /* instruction - 16k */
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#define DCACHE_SIZE 0x2000 /* data - 8k */
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#elif defined(CONFIG_M54xx)
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#define ICACHE_SIZE 0x8000 /* instruction - 32k */
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#define DCACHE_SIZE 0x8000 /* data - 32k */
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#endif
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#define CACHE_LINE_SIZE 0x0010 /* 16 bytes */
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#define CACHE_WAYS 4 /* 4 ways */
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/*
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* Version 4 cores have a true harvard style separate instruction
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* and data cache. Enable data and instruction caches, also enable write
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* buffers and branch accelerator.
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*/
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/* attention : enabling CACR_DESB requires a "nop" to flush the store buffer */
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/* use '+' instead of '|' for assembler's sake */
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/* Enable data cache */
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/* Enable data store buffer */
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/* outside ACRs : No cache, precise */
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/* Enable instruction+branch caches */
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#if defined(CONFIG_M5407)
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#define CACHE_MODE (CACR_DEC+CACR_DESB+CACR_DDCM_P+CACR_BEC+CACR_IEC)
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#else
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#define CACHE_MODE (CACR_DEC+CACR_DESB+CACR_DDCM_P+CACR_BEC+CACR_IEC+CACR_EUSP)
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#endif
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#define DATA_CACHE_MODE (ACR_ENABLE+ACR_ANY+ACR_CM_WT)
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#define INSN_CACHE_MODE (ACR_ENABLE+ACR_ANY)
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#ifndef __ASSEMBLY__
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#if ((DATA_CACHE_MODE & ACR_CM) == ACR_CM_WT)
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#define flush_dcache_range(a, l) do { asm("nop"); } while (0)
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#endif
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static inline void __m54xx_flush_cache_all(void)
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{
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__asm__ __volatile__ (
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#if ((DATA_CACHE_MODE & ACR_CM) == ACR_CM_CP)
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/*
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* Use cpushl to push and invalidate all cache lines.
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* Gas doesn't seem to know how to generate the ColdFire
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* cpushl instruction... Oh well, bit stuff it for now.
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*/
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"clrl %%d0\n\t"
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"1:\n\t"
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"movel %%d0,%%a0\n\t"
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"2:\n\t"
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".word 0xf468\n\t"
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"addl %0,%%a0\n\t"
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"cmpl %1,%%a0\n\t"
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"blt 2b\n\t"
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"addql #1,%%d0\n\t"
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"cmpil %2,%%d0\n\t"
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"bne 1b\n\t"
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#endif
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"movel %3,%%d0\n\t"
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"movec %%d0,%%CACR\n\t"
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"nop\n\t" /* forces flush of Store Buffer */
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: /* No output */
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: "i" (CACHE_LINE_SIZE),
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"i" (DCACHE_SIZE / CACHE_WAYS),
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"i" (CACHE_WAYS),
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"i" (CACHE_MODE|CACR_DCINVA|CACR_BCINVA|CACR_ICINVA)
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: "d0", "a0" );
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}
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#define __flush_cache_all() __m54xx_flush_cache_all()
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#endif /* __ASSEMBLY__ */
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#endif /* m54xxacr_h */
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