diff options
| -rw-r--r-- | arch/mips/Kconfig | 6 | ||||
| -rw-r--r-- | arch/mips/include/asm/cm.h | 38 | ||||
| -rw-r--r-- | arch/mips/include/asm/global_data.h | 3 | ||||
| -rw-r--r-- | arch/mips/include/asm/mipsregs.h | 5 | ||||
| -rw-r--r-- | arch/mips/lib/cache.c | 62 | ||||
| -rw-r--r-- | arch/mips/lib/cache_init.S | 183 |
6 files changed, 291 insertions, 6 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 47056b4bf8..76714379a4 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -315,6 +315,12 @@ config MIPS_L1_CACHE_SHIFT default "4" if MIPS_L1_CACHE_SHIFT_4 default "5" +config MIPS_L2_CACHE + bool + help + Select this if your system includes an L2 cache and you want U-Boot + to initialise & maintain it. + config DYNAMIC_IO_PORT_BASE bool diff --git a/arch/mips/include/asm/cm.h b/arch/mips/include/asm/cm.h index 0261733826..62ecef20fc 100644 --- a/arch/mips/include/asm/cm.h +++ b/arch/mips/include/asm/cm.h @@ -12,8 +12,46 @@ #define GCR_BASE 0x0008 #define GCR_BASE_UPPER 0x000c #define GCR_REV 0x0030 +#define GCR_L2_CONFIG 0x0130 +#define GCR_L2_TAG_ADDR 0x0600 +#define GCR_L2_TAG_ADDR_UPPER 0x0604 +#define GCR_L2_TAG_STATE 0x0608 +#define GCR_L2_TAG_STATE_UPPER 0x060c +#define GCR_L2_DATA 0x0610 +#define GCR_L2_DATA_UPPER 0x0614 /* GCR_REV CM versions */ #define GCR_REV_CM3 0x0800 +/* GCR_L2_CONFIG fields */ +#define GCR_L2_CONFIG_ASSOC_SHIFT 0 +#define GCR_L2_CONFIG_ASSOC_BITS 8 +#define GCR_L2_CONFIG_LINESZ_SHIFT 8 +#define GCR_L2_CONFIG_LINESZ_BITS 4 +#define GCR_L2_CONFIG_SETSZ_SHIFT 12 +#define GCR_L2_CONFIG_SETSZ_BITS 4 +#define GCR_L2_CONFIG_BYPASS (1 << 20) + +#ifndef __ASSEMBLY__ + +#include <asm/io.h> + +static inline void *mips_cm_base(void) +{ + return (void *)CKSEG1ADDR(CONFIG_MIPS_CM_BASE); +} + +static inline unsigned long mips_cm_l2_line_size(void) +{ + unsigned long l2conf, line_sz; + + l2conf = __raw_readl(mips_cm_base() + GCR_L2_CONFIG); + + line_sz = l2conf >> GCR_L2_CONFIG_LINESZ_SHIFT; + line_sz &= GENMASK(GCR_L2_CONFIG_LINESZ_BITS - 1, 0); + return line_sz ? (2 << line_sz) : 0; +} + +#endif /* !__ASSEMBLY__ */ + #endif /* __MIPS_ASM_CM_H__ */ diff --git a/arch/mips/include/asm/global_data.h b/arch/mips/include/asm/global_data.h index 8533b691b6..0078bbe1b8 100644 --- a/arch/mips/include/asm/global_data.h +++ b/arch/mips/include/asm/global_data.h @@ -25,6 +25,9 @@ struct arch_global_data { unsigned short l1i_line_size; unsigned short l1d_line_size; #endif +#ifdef CONFIG_MIPS_L2_CACHE + unsigned short l2_line_size; +#endif }; #include <asm-generic/global_data.h> diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h index cd4f952df0..b4c2dff483 100644 --- a/arch/mips/include/asm/mipsregs.h +++ b/arch/mips/include/asm/mipsregs.h @@ -485,9 +485,13 @@ #define MIPS_CONF1_TLBS_SIZE (6) #define MIPS_CONF1_TLBS (_ULCAST_(63) << MIPS_CONF1_TLBS_SHIFT) +#define MIPS_CONF2_SA_SHF 0 #define MIPS_CONF2_SA (_ULCAST_(15) << 0) +#define MIPS_CONF2_SL_SHF 4 #define MIPS_CONF2_SL (_ULCAST_(15) << 4) +#define MIPS_CONF2_SS_SHF 8 #define MIPS_CONF2_SS (_ULCAST_(15) << 8) +#define MIPS_CONF2_L2B (_ULCAST_(1) << 12) #define MIPS_CONF2_SU (_ULCAST_(15) << 12) #define MIPS_CONF2_TA (_ULCAST_(15) << 16) #define MIPS_CONF2_TL (_ULCAST_(15) << 20) @@ -551,6 +555,7 @@ #define MIPS_CONF5_MVH (_ULCAST_(1) << 5) #define MIPS_CONF5_FRE (_ULCAST_(1) << 8) #define MIPS_CONF5_UFE (_ULCAST_(1) << 9) +#define MIPS_CONF5_L2C (_ULCAST_(1) << 10) #define MIPS_CONF5_MSAEN (_ULCAST_(1) << 27) #define MIPS_CONF5_EVA (_ULCAST_(1) << 28) #define MIPS_CONF5_CV (_ULCAST_(1) << 29) diff --git a/arch/mips/lib/cache.c b/arch/mips/lib/cache.c index d8baf08aa8..bd14ba6ea7 100644 --- a/arch/mips/lib/cache.c +++ b/arch/mips/lib/cache.c @@ -7,10 +7,44 @@ #include <common.h> #include <asm/cacheops.h> +#include <asm/cm.h> #include <asm/mipsregs.h> DECLARE_GLOBAL_DATA_PTR; +static void probe_l2(void) +{ +#ifdef CONFIG_MIPS_L2_CACHE + unsigned long conf2, sl; + bool l2c = false; + + if (!(read_c0_config1() & MIPS_CONF_M)) + return; + + conf2 = read_c0_config2(); + + if (__mips_isa_rev >= 6) { + l2c = conf2 & MIPS_CONF_M; + if (l2c) + l2c = read_c0_config3() & MIPS_CONF_M; + if (l2c) + l2c = read_c0_config4() & MIPS_CONF_M; + if (l2c) + l2c = read_c0_config5() & MIPS_CONF5_L2C; + } + + if (l2c && config_enabled(CONFIG_MIPS_CM)) { + gd->arch.l2_line_size = mips_cm_l2_line_size(); + } else if (l2c) { + /* We don't know how to retrieve L2 config on this system */ + BUG(); + } else { + sl = (conf2 & MIPS_CONF2_SL) >> MIPS_CONF2_SL_SHF; + gd->arch.l2_line_size = sl ? (2 << sl) : 0; + } +#endif +} + void mips_cache_probe(void) { #ifdef CONFIG_SYS_CACHE_SIZE_AUTO @@ -24,6 +58,7 @@ void mips_cache_probe(void) gd->arch.l1i_line_size = il ? (2 << il) : 0; gd->arch.l1d_line_size = dl ? (2 << dl) : 0; #endif + probe_l2(); } static inline unsigned long icache_line_size(void) @@ -44,6 +79,15 @@ static inline unsigned long dcache_line_size(void) #endif } +static inline unsigned long scache_line_size(void) +{ +#ifdef CONFIG_MIPS_L2_CACHE + return gd->arch.l2_line_size; +#else + return 0; +#endif +} + #define cache_loop(start, end, lsize, ops...) do { \ const void *addr = (const void *)(start & ~(lsize - 1)); \ const void *aend = (const void *)((end - 1) & ~(lsize - 1)); \ @@ -60,12 +104,13 @@ void flush_cache(ulong start_addr, ulong size) { unsigned long ilsize = icache_line_size(); unsigned long dlsize = dcache_line_size(); + unsigned long slsize = scache_line_size(); /* aend will be miscalculated when size is zero, so we return here */ if (size == 0) return; - if (ilsize == dlsize) { + if ((ilsize == dlsize) && !slsize) { /* flush I-cache & D-cache simultaneously */ cache_loop(start_addr, start_addr + size, ilsize, HIT_WRITEBACK_INV_D, HIT_INVALIDATE_I); @@ -75,6 +120,11 @@ void flush_cache(ulong start_addr, ulong size) /* flush D-cache */ cache_loop(start_addr, start_addr + size, dlsize, HIT_WRITEBACK_INV_D); + /* flush L2 cache */ + if (slsize) + cache_loop(start_addr, start_addr + size, slsize, + HIT_WRITEBACK_INV_SD); + /* flush I-cache */ cache_loop(start_addr, start_addr + size, ilsize, HIT_INVALIDATE_I); } @@ -82,21 +132,31 @@ void flush_cache(ulong start_addr, ulong size) void flush_dcache_range(ulong start_addr, ulong stop) { unsigned long lsize = dcache_line_size(); + unsigned long slsize = scache_line_size(); /* aend will be miscalculated when size is zero, so we return here */ if (start_addr == stop) return; cache_loop(start_addr, stop, lsize, HIT_WRITEBACK_INV_D); + + /* flush L2 cache */ + if (slsize) + cache_loop(start_addr, stop, slsize, HIT_WRITEBACK_INV_SD); } void invalidate_dcache_range(ulong start_addr, ulong stop) { unsigned long lsize = dcache_line_size(); + unsigned long slsize = scache_line_size(); /* aend will be miscalculated when size is zero, so we return here */ if (start_addr == stop) return; + /* invalidate L2 cache */ + if (slsize) + cache_loop(start_addr, stop, slsize, HIT_INVALIDATE_SD); + cache_loop(start_addr, stop, lsize, HIT_INVALIDATE_D); } diff --git a/arch/mips/lib/cache_init.S b/arch/mips/lib/cache_init.S index 9be3a0761c..ecb88e5683 100644 --- a/arch/mips/lib/cache_init.S +++ b/arch/mips/lib/cache_init.S @@ -13,6 +13,7 @@ #include <asm/mipsregs.h> #include <asm/addrspace.h> #include <asm/cacheops.h> +#include <asm/cm.h> #ifndef CONFIG_SYS_MIPS_CACHE_MODE #define CONFIG_SYS_MIPS_CACHE_MODE CONF_CM_CACHABLE_NONCOHERENT @@ -95,14 +96,135 @@ * with good parity is available. This routine will initialise an area of * memory starting at location zero to be used as a source of parity. * + * Note that this function does not follow the standard calling convention & + * may clobber typically callee-saved registers. + * * RETURNS: N/A * */ -#define R_IC_SIZE t2 -#define R_IC_LINE t8 -#define R_DC_SIZE t3 -#define R_DC_LINE t9 +#define R_RETURN s0 +#define R_IC_SIZE s1 +#define R_IC_LINE s2 +#define R_DC_SIZE s3 +#define R_DC_LINE s4 +#define R_L2_SIZE s5 +#define R_L2_LINE s6 +#define R_L2_BYPASSED s7 +#define R_L2_L2C t8 LEAF(mips_cache_reset) + move R_RETURN, ra + +#ifdef CONFIG_MIPS_L2_CACHE + /* + * For there to be an L2 present, Config2 must be present. If it isn't + * then we proceed knowing there's no L2 cache. + */ + move R_L2_SIZE, zero + move R_L2_LINE, zero + move R_L2_BYPASSED, zero + move R_L2_L2C, zero + mfc0 t0, CP0_CONFIG, 1 + bgez t0, l2_probe_done + + /* + * From MIPSr6 onwards the L2 cache configuration might not be reported + * by Config2. The Config5.L2C bit indicates whether this is the case, + * and if it is then we need knowledge of where else to look. For cores + * from Imagination Technologies this is a CM GCR. + */ +# if __mips_isa_rev >= 6 + /* Check that Config5 exists */ + mfc0 t0, CP0_CONFIG, 2 + bgez t0, l2_probe_cop0 + mfc0 t0, CP0_CONFIG, 3 + bgez t0, l2_probe_cop0 + mfc0 t0, CP0_CONFIG, 4 + bgez t0, l2_probe_cop0 + + /* Check Config5.L2C is set */ + mfc0 t0, CP0_CONFIG, 5 + and R_L2_L2C, t0, MIPS_CONF5_L2C + beqz R_L2_L2C, l2_probe_cop0 + + /* Config5.L2C is set */ +# ifdef CONFIG_MIPS_CM + /* The CM will provide L2 configuration */ + PTR_LI t0, CKSEG1ADDR(CONFIG_MIPS_CM_BASE) + lw t1, GCR_L2_CONFIG(t0) + bgez t1, l2_probe_done + + ext R_L2_LINE, t1, \ + GCR_L2_CONFIG_LINESZ_SHIFT, GCR_L2_CONFIG_LINESZ_BITS + beqz R_L2_LINE, l2_probe_done + li t2, 2 + sllv R_L2_LINE, t2, R_L2_LINE + + ext t2, t1, GCR_L2_CONFIG_ASSOC_SHIFT, GCR_L2_CONFIG_ASSOC_BITS + addiu t2, t2, 1 + mul R_L2_SIZE, R_L2_LINE, t2 + + ext t2, t1, GCR_L2_CONFIG_SETSZ_SHIFT, GCR_L2_CONFIG_SETSZ_BITS + sllv R_L2_SIZE, R_L2_SIZE, t2 + li t2, 64 + mul R_L2_SIZE, R_L2_SIZE, t2 + + /* Bypass the L2 cache so that we can init the L1s early */ + or t1, t1, GCR_L2_CONFIG_BYPASS + sw t1, GCR_L2_CONFIG(t0) + sync + li R_L2_BYPASSED, 1 + + /* Zero the L2 tag registers */ + sw zero, GCR_L2_TAG_ADDR(t0) + sw zero, GCR_L2_TAG_ADDR_UPPER(t0) + sw zero, GCR_L2_TAG_STATE(t0) + sw zero, GCR_L2_TAG_STATE_UPPER(t0) + sw zero, GCR_L2_DATA(t0) + sw zero, GCR_L2_DATA_UPPER(t0) + sync +# else + /* We don't know how to retrieve L2 configuration on this system */ +# endif + b l2_probe_done +# endif + + /* + * For pre-r6 systems, or r6 systems with Config5.L2C==0, probe the L2 + * cache configuration from the cop0 Config2 register. + */ +l2_probe_cop0: + mfc0 t0, CP0_CONFIG, 2 + + srl R_L2_LINE, t0, MIPS_CONF2_SL_SHF + andi R_L2_LINE, R_L2_LINE, MIPS_CONF2_SL >> MIPS_CONF2_SL_SHF + beqz R_L2_LINE, l2_probe_done + li t1, 2 + sllv R_L2_LINE, t1, R_L2_LINE + + srl t1, t0, MIPS_CONF2_SA_SHF + andi t1, t1, MIPS_CONF2_SA >> MIPS_CONF2_SA_SHF + addiu t1, t1, 1 + mul R_L2_SIZE, R_L2_LINE, t1 + + srl t1, t0, MIPS_CONF2_SS_SHF + andi t1, t1, MIPS_CONF2_SS >> MIPS_CONF2_SS_SHF + sllv R_L2_SIZE, R_L2_SIZE, t1 + li t1, 64 + mul R_L2_SIZE, R_L2_SIZE, t1 + + /* Attempt to bypass the L2 so that we can init the L1s early */ + or t0, t0, MIPS_CONF2_L2B + mtc0 t0, CP0_CONFIG, 2 + ehb + mfc0 t0, CP0_CONFIG, 2 + and R_L2_BYPASSED, t0, MIPS_CONF2_L2B + + /* Zero the L2 tag registers */ + mtc0 zero, CP0_TAGLO, 4 + ehb +l2_probe_done: +#endif + #ifndef CONFIG_SYS_CACHE_SIZE_AUTO li R_IC_SIZE, CONFIG_SYS_ICACHE_SIZE li R_IC_LINE, CONFIG_SYS_ICACHE_LINE_SIZE @@ -142,11 +264,33 @@ LEAF(mips_cache_reset) #endif /* CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD */ +#ifdef CONFIG_MIPS_L2_CACHE + /* + * If the L2 is bypassed, init the L1 first so that we can execute the + * rest of the cache initialisation using the L1 instruction cache. + */ + bnez R_L2_BYPASSED, l1_init + +l2_init: + PTR_LI t0, INDEX_BASE + PTR_ADDU t1, t0, R_L2_SIZE +1: cache INDEX_STORE_TAG_SD, 0(t0) + PTR_ADDU t0, t0, R_L2_LINE + bne t0, t1, 1b + + /* + * If the L2 was bypassed then we already initialised the L1s before + * the L2, so we are now done. + */ + bnez R_L2_BYPASSED, l2_unbypass +#endif + /* * The TagLo registers used depend upon the CPU implementation, but the * architecture requires that it is safe for software to write to both * TagLo selects 0 & 2 covering supported cases. */ +l1_init: mtc0 zero, CP0_TAGLO mtc0 zero, CP0_TAGLO, 2 @@ -207,8 +351,37 @@ LEAF(mips_cache_reset) PTR_LI t0, INDEX_BASE cache_loop t0, t1, R_DC_LINE, INDEX_STORE_TAG_D #endif +3: + +#ifdef CONFIG_MIPS_L2_CACHE + /* If the L2 isn't bypassed then we're done */ + beqz R_L2_BYPASSED, return + + /* The L2 is bypassed - go initialise it */ + b l2_init + +l2_unbypass: +# if __mips_isa_rev >= 6 + beqz R_L2_L2C, 1f + + li t0, CKSEG1ADDR(CONFIG_MIPS_CM_BASE) + lw t1, GCR_L2_CONFIG(t0) + xor t1, t1, GCR_L2_CONFIG_BYPASS + sw t1, GCR_L2_CONFIG(t0) + sync + ehb + b 2f +# endif +1: mfc0 t0, CP0_CONFIG, 2 + xor t0, t0, MIPS_CONF2_L2B + mtc0 t0, CP0_CONFIG, 2 + ehb + +2: +#endif -3: jr ra +return: + jr ra END(mips_cache_reset) /* |