diff options
author | Michal Simek <monstr@monstr.eu> | 2007-05-08 00:32:35 +0200 |
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committer | Michal Simek <monstr@monstr.eu> | 2007-05-08 00:32:35 +0200 |
commit | 3c4bd60de15d79ddfc0cf3170a55847b2025d93f (patch) | |
tree | 891b84b58f13a5f45536a243585b9d94c253a410 /cpu/mpc86xx/spd_sdram.c | |
parent | fb05f6da35ea1c15c553abe6f23f656bf18dc5db (diff) | |
parent | ac4cd59d59c9bf3f89cb7a344abf8184d678f562 (diff) |
Merge git://www.denx.de/git/u-boot
Conflicts:
include/asm-microblaze/microblaze_intc.h
include/linux/stat.h
Diffstat (limited to 'cpu/mpc86xx/spd_sdram.c')
-rw-r--r-- | cpu/mpc86xx/spd_sdram.c | 32 |
1 files changed, 22 insertions, 10 deletions
diff --git a/cpu/mpc86xx/spd_sdram.c b/cpu/mpc86xx/spd_sdram.c index b18e8225d..f37ab430b 100644 --- a/cpu/mpc86xx/spd_sdram.c +++ b/cpu/mpc86xx/spd_sdram.c @@ -51,20 +51,32 @@ extern int dma_xfer(void *dest, uint count, void *src); #define CFG_SUPER_BANK_INTERLEAVING 0 /* - * Convert picoseconds into clock cycles (rounding up if needed). + * Convert picoseconds into DRAM clock cycles (rounding up if needed). */ -int -picos_to_clk(int picos) +static unsigned int +picos_to_clk(unsigned int picos) { - int clks; - - clks = picos / (2000000000 / (get_bus_freq(0) / 1000)); - if (picos % (2000000000 / (get_bus_freq(0) / 1000)) != 0) { + /* use unsigned long long to avoid rounding errors */ + const unsigned long long ULL_2e12 = 2000000000000ULL; + unsigned long long clks; + unsigned long long clks_temp; + + if (! picos) + return 0; + + clks = get_bus_freq(0) * (unsigned long long) picos; + clks_temp = clks; + clks = clks / ULL_2e12; + if (clks_temp % ULL_2e12) { clks++; } - return clks; + if (clks > 0xFFFFFFFFULL) { + clks = 0xFFFFFFFFULL; + } + + return (unsigned int) clks; } @@ -284,9 +296,9 @@ spd_init(unsigned char i2c_address, unsigned int ddr_num, } /* - * Adjust DDR II IO voltage biasing. It just makes it work. + * Adjust DDR II IO voltage biasing. Rev1 only */ - if (spd.mem_type == SPD_MEMTYPE_DDR2) { + if (((get_svr() & 0xf0) == 0x10) && (spd.mem_type == SPD_MEMTYPE_DDR2)) { gur->ddrioovcr = (0 | 0x80000000 /* Enable */ | 0x10000000 /* VSEL to 1.8V */ |