diff options
Diffstat (limited to 'arch/sh/kernel/cpu/sh3/probe.c')
| -rw-r--r-- | arch/sh/kernel/cpu/sh3/probe.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh3/probe.c b/arch/sh/kernel/cpu/sh3/probe.c new file mode 100644 index 000000000..5e7ad591a --- /dev/null +++ b/arch/sh/kernel/cpu/sh3/probe.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * arch/sh/kernel/cpu/sh3/probe.c + * + * CPU Subtype Probing for SH-3. + * + * Copyright (C) 1999, 2000 Niibe Yutaka + * Copyright (C) 2002 Paul Mundt + */ + +#include <linux/init.h> +#include <asm/processor.h> +#include <asm/cache.h> +#include <asm/io.h> + +void cpu_probe(void) +{ + unsigned long addr0, addr1, data0, data1, data2, data3; + + jump_to_uncached(); + /* + * Check if the entry shadows or not. + * When shadowed, it's 128-entry system. + * Otherwise, it's 256-entry system. + */ + addr0 = CACHE_OC_ADDRESS_ARRAY + (3 << 12); + addr1 = CACHE_OC_ADDRESS_ARRAY + (1 << 12); + + /* First, write back & invalidate */ + data0 = __raw_readl(addr0); + __raw_writel(data0&~(SH_CACHE_VALID|SH_CACHE_UPDATED), addr0); + data1 = __raw_readl(addr1); + __raw_writel(data1&~(SH_CACHE_VALID|SH_CACHE_UPDATED), addr1); + + /* Next, check if there's shadow or not */ + data0 = __raw_readl(addr0); + data0 ^= SH_CACHE_VALID; + __raw_writel(data0, addr0); + data1 = __raw_readl(addr1); + data2 = data1 ^ SH_CACHE_VALID; + __raw_writel(data2, addr1); + data3 = __raw_readl(addr0); + + /* Lastly, invaliate them. */ + __raw_writel(data0&~SH_CACHE_VALID, addr0); + __raw_writel(data2&~SH_CACHE_VALID, addr1); + + back_to_cached(); + + boot_cpu_data.dcache.ways = 4; + boot_cpu_data.dcache.entry_shift = 4; + boot_cpu_data.dcache.linesz = L1_CACHE_BYTES; + boot_cpu_data.dcache.flags = 0; + + /* + * 7709A/7729 has 16K cache (256-entry), while 7702 has only + * 2K(direct) 7702 is not supported (yet) + */ + if (data0 == data1 && data2 == data3) { /* Shadow */ + boot_cpu_data.dcache.way_incr = (1 << 11); + boot_cpu_data.dcache.entry_mask = 0x7f0; + boot_cpu_data.dcache.sets = 128; + boot_cpu_data.type = CPU_SH7708; + + boot_cpu_data.flags |= CPU_HAS_MMU_PAGE_ASSOC; + } else { /* 7709A or 7729 */ + boot_cpu_data.dcache.way_incr = (1 << 12); + boot_cpu_data.dcache.entry_mask = 0xff0; + boot_cpu_data.dcache.sets = 256; + boot_cpu_data.type = CPU_SH7729; + +#if defined(CONFIG_CPU_SUBTYPE_SH7706) + boot_cpu_data.type = CPU_SH7706; +#endif +#if defined(CONFIG_CPU_SUBTYPE_SH7710) + boot_cpu_data.type = CPU_SH7710; +#endif +#if defined(CONFIG_CPU_SUBTYPE_SH7712) + boot_cpu_data.type = CPU_SH7712; +#endif +#if defined(CONFIG_CPU_SUBTYPE_SH7720) + boot_cpu_data.type = CPU_SH7720; +#endif +#if defined(CONFIG_CPU_SUBTYPE_SH7721) + boot_cpu_data.type = CPU_SH7721; +#endif +#if defined(CONFIG_CPU_SUBTYPE_SH7705) + boot_cpu_data.type = CPU_SH7705; + +#if defined(CONFIG_SH7705_CACHE_32KB) + boot_cpu_data.dcache.way_incr = (1 << 13); + boot_cpu_data.dcache.entry_mask = 0x1ff0; + boot_cpu_data.dcache.sets = 512; + __raw_writel(CCR_CACHE_32KB, CCR3_REG); +#else + __raw_writel(CCR_CACHE_16KB, CCR3_REG); +#endif +#endif + } + + /* + * SH-3 doesn't have separate caches + */ + boot_cpu_data.dcache.flags |= SH_CACHE_COMBINED; + boot_cpu_data.icache = boot_cpu_data.dcache; + + boot_cpu_data.family = CPU_FAMILY_SH3; +} |