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| author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2012-08-03 08:52:39 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2012-08-03 15:51:02 +0200 |
| commit | 46a11f99ff97396306edeea5615a21e2df1bc377 (patch) | |
| tree | 6fc4c3bb1f27e0dd883b0f7696ceea856aba8183 /arch/arm/mach-at91/include/mach/at91sam9_sdramc.h | |
| parent | 1e1c4dcd8c7b8903afe7c622bcb1d4eb4382c264 (diff) | |
| download | barebox-46a11f99ff97396306edeea5615a21e2df1bc377.tar.gz barebox-46a11f99ff97396306edeea5615a21e2df1bc377.tar.xz | |
at91: sam9260/sam9g20/sam9261/sam9g10/sam9263 add autodetect sdram size
if 0 is passed to at91_add_device_sdram autodetect the sdram size
The amount of available ram is determined by the SDRAMC_CR register.
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-at91/include/mach/at91sam9_sdramc.h')
| -rw-r--r-- | arch/arm/mach-at91/include/mach/at91sam9_sdramc.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/include/mach/at91sam9_sdramc.h b/arch/arm/mach-at91/include/mach/at91sam9_sdramc.h index 5af2b54b12..1ab61e918b 100644 --- a/arch/arm/mach-at91/include/mach/at91sam9_sdramc.h +++ b/arch/arm/mach-at91/include/mach/at91sam9_sdramc.h @@ -83,5 +83,33 @@ #define AT91_SDRAMC_MD_SDRAM 0 #define AT91_SDRAMC_MD_LOW_POWER_SDRAM 1 +#ifndef __ASSEMBLY__ +#include <mach/io.h> +static inline u32 at91_get_sdram_size(void) +{ + u32 val; + u32 size; + + val = at91_sys_read(AT91_SDRAMC_CR); + + /* Formula: + * size = bank << (col + row + 1); + * if (bandwidth == 32 bits) + * size <<= 1; + */ + size = 1; + /* COL */ + size += (val & AT91_SDRAMC_NC) + 8; + /* ROW */ + size += ((val & AT91_SDRAMC_NR) >> 2) + 11; + /* BANK */ + size = ((val & AT91_SDRAMC_NB) ? 4 : 2) << size; + /* bandwidth */ + if (!(val & AT91_SDRAMC_DBW)) + size <<= 1; + + return size; +} +#endif #endif |