diff options
Diffstat (limited to 'arch/blackfin/kernel/setup.c')
| -rw-r--r-- | arch/blackfin/kernel/setup.c | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c index c2f3e73ba25a..d6668328be72 100644 --- a/arch/blackfin/kernel/setup.c +++ b/arch/blackfin/kernel/setup.c @@ -649,6 +649,49 @@ static __init void setup_bootmem_allocator(void) BOOTMEM_DEFAULT); } +#define EBSZ_TO_MEG(ebsz) \ +({ \ + int meg = 0; \ + switch (ebsz & 0xf) { \ + case 0x1: meg = 16; break; \ + case 0x3: meg = 32; break; \ + case 0x5: meg = 64; break; \ + case 0x7: meg = 128; break; \ + case 0x9: meg = 256; break; \ + case 0xb: meg = 512; break; \ + } \ + meg; \ +}) +static inline int __init get_mem_size(void) +{ +#ifdef CONFIG_MEM_SIZE + return CONFIG_MEM_SIZE; +#else +# if defined(EBIU_SDBCTL) +# if defined(BF561_FAMILY) + int ret = 0; + u32 sdbctl = bfin_read_EBIU_SDBCTL(); + ret += EBSZ_TO_MEG(sdbctl >> 0); + ret += EBSZ_TO_MEG(sdbctl >> 8); + ret += EBSZ_TO_MEG(sdbctl >> 16); + ret += EBSZ_TO_MEG(sdbctl >> 24); + return ret; +# else + return EBSZ_TO_MEG(bfin_read_EBIU_SDBCTL()); +# endif +# elif defined(EBIU_DDRCTL1) + switch (bfin_read_EBIU_DDRCTL1() & 0xc0000) { + case DEVSZ_64: return 64; + case DEVSZ_128: return 128; + case DEVSZ_256: return 256; + case DEVSZ_512: return 512; + default: return 0; + } +# endif +#endif + BUG(); +} + void __init setup_arch(char **cmdline_p) { unsigned long sclk, cclk; @@ -669,7 +712,7 @@ void __init setup_arch(char **cmdline_p) /* setup memory defaults from the user config */ physical_mem_end = 0; - _ramend = CONFIG_MEM_SIZE * 1024 * 1024; + _ramend = get_mem_size() * 1024 * 1024; memset(&bfin_memmap, 0, sizeof(bfin_memmap)); |