diff options
Diffstat (limited to 'arch/arm/mach-mxs/include/mach/imx28.h')
| -rw-r--r-- | arch/arm/mach-mxs/include/mach/imx28.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm/mach-mxs/include/mach/imx28.h b/arch/arm/mach-mxs/include/mach/imx28.h new file mode 100644 index 0000000000..5816625c89 --- /dev/null +++ b/arch/arm/mach-mxs/include/mach/imx28.h @@ -0,0 +1,30 @@ +#ifndef __MACH_IMX28_H +#define __MACH_IMX28_H + +#include <linux/bitfield.h> +#include <io.h> + +#define DRAM_CTL29_CS0_EN BIT(24) +#define DRAM_CTL29_CS1_EN BIT(25) +#define DRAM_CTL29_COLUMNS_DIFF GENMASK(18, 16) +#define DRAM_CTL29_ROWS_DIFF GENMASK(10, 8) +#define DRAM_CTL31_EIGHT_BANKS BIT(16) + +#define DRAM_CTL(n) (IMX_SDRAMC_BASE + 4 * (n)) + +static inline u32 imx28_get_memsize(void) +{ + u32 ctl29 = readl(DRAM_CTL(29)); + u32 ctl31 = readl(DRAM_CTL(31)); + int rows, columns, banks, cs0, cs1; + + columns = 12 - FIELD_GET(DRAM_CTL29_COLUMNS_DIFF, ctl29); + rows = 15 - FIELD_GET(DRAM_CTL29_ROWS_DIFF, ctl29); + banks = FIELD_GET(DRAM_CTL31_EIGHT_BANKS, ctl31) ? 8 : 4; + cs0 = FIELD_GET(DRAM_CTL29_CS0_EN, ctl29); + cs1 = FIELD_GET(DRAM_CTL29_CS1_EN, ctl29); + + return (1 << columns) * (1 << rows) * banks * (cs0 + cs1); +} + +#endif /* __MACH_IMX28_H */
\ No newline at end of file |