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tegra124: Get RAM_CODE for SDRAM initialization.

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The RAM_CODE on Tegra can be used to determine SDRAM configuration type.

BUG=none
TEST=emerge-nyan chromeos-coreboot-nyan

Change-Id: Ica770ed6089f6ff8c38841f2cc8fd2778b6d786f
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/183781
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Hung-Te Lin 2014-01-24 22:20:37 +08:00 • committed by chrome-internal-fetch
commit a5b7ce7052
3 changed files with 18 additions and 1 deletions
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10
src/soc/nvidia/tegra124/pmc.h
View file

@ -244,7 +244,9 @@ struct tegra_pmc_regs {
u32 cntrl2;
u8 _rsv3[0x18];
u32 io_dpd3_req;
u8 _rsv4[0x1a0];
u32 io_dqd3_status;
u32 strapping_opt_a;
u8 _rsv4[0x198];
u32 scratch56;
u32 scratch57;
u32 scratch58;
@ -378,4 +380,10 @@ enum {
0x3f << PMC_OSC_EDPD_OVER_XOFS_SHIFT
};
enum {
PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT = 4,
PMC_STRAPPING_OPT_A_RAM_CODE_MASK =
0xf << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT,
};
#endif /* _TEGRA124_PMC_H_ */

8
src/soc/nvidia/tegra124/sdram.c
View file

@ -601,3 +601,11 @@ void sdram_init(const struct sdram_params *param)
sdram_enable_arbiter(param);
sdram_lock_carveouts(param, mc);
}
uint32_t sdram_get_ram_code(void)
{
struct tegra_pmc_regs *pmc = (struct tegra_pmc_regs*)TEGRA_PMC_BASE;
return ((readl(&pmc->strapping_opt_a) &
PMC_STRAPPING_OPT_A_RAM_CODE_MASK) >>
PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT);
}

1
src/soc/nvidia/tegra124/sdram.h
View file

@ -22,6 +22,7 @@
#include "sdram_param.h"
uint32_t sdram_get_ram_code(void);
void sdram_init(const struct sdram_params *param);
#endif /* __SOC_NVIDIA_TEGRA124_SDRAM_H__ */