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board/tqm85xx: Create and tear down TLB for get_ram_size()

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We need a TLB entry to call get_ram_size(); the common code doesn't create
one until *after* fixed_sdram() has determined the size.  So we set up tlbs
for the max possible size and tear them down once we're done with
get_ram_size(); the common 85xx code will then set up a final set of tlb
entries for the *actual* detected size of ddr.

This prevents us from having TLB entries that are larger than DDR sitting
around for very long, which is not a recommended scenario.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Becky Bruce 2011-07-18 18:49:16 -05:00 committed by Kumar Gala
parent 9cdfe28106
commit 51f924e5ce
2 changed files with 13 additions and 0 deletions
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7
board/tqc/tqm85xx/sdram.c
View File

@ -363,6 +363,12 @@ static phys_size_t sdram_setup(int casl)
udelay (1000);
#endif /* CONFIG_TQM8548 */
/*
* get_ram_size() depends on having tlbs for the DDR, but they are
* not yet setup because we don't know the size. Set up a temp
* mapping and delete it when done.
*/
setup_ddr_tlbs(CONFIG_SYS_DDR_EARLY_SIZE_MB);
for (i = 0; i < N_DDR_CS_CONF; i++) {
ddr->cs0_config = ddr_cs_conf[i].reg;
@ -376,6 +382,7 @@ static phys_size_t sdram_setup(int casl)
break;
}
}
clear_ddr_tlbs(CONFIG_SYS_DDR_EARLY_SIZE_MB);
#ifdef CONFIG_TQM8548
if (i < N_DDR_CS_CONF) {

6
include/configs/TQM85xx.h
View File

@ -147,10 +147,16 @@
* DDR Setup
*/
#define CONFIG_SYS_DDR_SDRAM_BASE 0x00000000 /* DDR is system memory */
#if defined(CONFIG_TQM_BIGFLASH) || \
(!defined(CONFIG_TQM8548_AG) && !defined(CONFIG_TQM8548_BE))
#define CONFIG_SYS_PPC_DDR_WIMGE (MAS2_I | MAS2_G)
#define CONFIG_SYS_DDR_EARLY_SIZE_MB (512)
#else
#define CONFIG_SYS_PPC_DDR_WIMGE (0)
#define CONFIG_SYS_DDR_EARLY_SIZE_MB (2 * 1024)
#endif
#define CONFIG_SYS_SDRAM_BASE CONFIG_SYS_DDR_SDRAM_BASE
#ifdef CONFIG_TQM8548_AG
#define CONFIG_VERY_BIG_RAM