diff options
Diffstat (limited to 'board/tqm8xx/flash.c')
| -rw-r--r-- | board/tqm8xx/flash.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/board/tqm8xx/flash.c b/board/tqm8xx/flash.c index b8a3595cf..97bb5c3ee 100644 --- a/board/tqm8xx/flash.c +++ b/board/tqm8xx/flash.c @@ -29,6 +29,15 @@ #include <mpc8xx.h> #include <environment.h> +#include <asm/processor.h> + +#if defined(CONFIG_TQM8xxL) && !defined(CONFIG_TQM866M) +# ifndef CFG_OR_TIMING_FLASH_AT_50MHZ +# define CFG_OR_TIMING_FLASH_AT_50MHZ (OR_ACS_DIV1 | OR_TRLX | OR_CSNT_SAM | \ + OR_SCY_2_CLK | OR_EHTR | OR_BI) +# endif +#endif /* CONFIG_TQM8xxL/M, !TQM866M */ + #ifndef CFG_ENV_ADDR #define CFG_ENV_ADDR (CFG_FLASH_BASE + CFG_ENV_OFFSET) #endif @@ -51,6 +60,50 @@ unsigned long flash_init (void) unsigned long size_b0, size_b1; int i; +#ifdef CFG_OR_TIMING_FLASH_AT_50MHZ + int scy, trlx, flash_or_timing, clk_diff; + + DECLARE_GLOBAL_DATA_PTR; + + scy = (CFG_OR_TIMING_FLASH_AT_50MHZ & OR_SCY_MSK) >> 4; + if (CFG_OR_TIMING_FLASH_AT_50MHZ & OR_TRLX) { + trlx = OR_TRLX; + scy *= 2; + } else + trlx = 0; + + /* We assume that each 10MHz of bus clock require 1-clk SCY + * adjustment. + */ + clk_diff = (gd->bus_clk / 1000000) - 50; + + /* We need proper rounding here. This is what the "+5" and "-5" + * are here for. + */ + if (clk_diff >= 0) + scy += (clk_diff + 5) / 10; + else + scy += (clk_diff - 5) / 10; + + /* For bus frequencies above 50MHz, we want to use relaxed timing + * (OR_TRLX). + */ + if (gd->bus_clk >= 50000000) + trlx = OR_TRLX; + else + trlx = 0; + + if (trlx) + scy /= 2; + + if (scy > 0xf) + scy = 0xf; + if (scy < 1) + scy = 1; + + flash_or_timing = (scy << 4) | trlx | + (CFG_OR_TIMING_FLASH_AT_50MHZ & ~(OR_TRLX | OR_SCY_MSK)); +#endif /* Init: no FLASHes known */ for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) { flash_info[i].flash_id = FLASH_UNKNOWN; @@ -95,7 +148,11 @@ unsigned long flash_init (void) memctl->memc_br1, memctl->memc_or1); /* Remap FLASH according to real size */ +#ifndef CFG_OR_TIMING_FLASH_AT_50MHZ memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & OR_AM_MSK); +#else + memctl->memc_or0 = flash_or_timing | (-size_b0 & OR_AM_MSK); +#endif memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V; debug ("## BR0: 0x%08x OR0: 0x%08x\n", @@ -146,7 +203,11 @@ unsigned long flash_init (void) #endif if (size_b1) { +#ifndef CFG_OR_TIMING_FLASH_AT_50MHZ memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000); +#else + memctl->memc_or1 = flash_or_timing | (-size_b1 & 0xFFFF8000); +#endif memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) | BR_MS_GPCM | BR_V; |