diff options
| author | Troy Kisky <troy.kisky@boundarydevices.com> | 2012-10-23 10:57:48 +0000 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2012-11-10 08:15:40 +0100 |
| commit | eb0344d9746103f4c1d61e05630ee4e6e61334ea (patch) | |
| tree | c8e9784eae50f88c668deabb5123af1abfcfb545 /arch/arm/imx-common | |
| parent | 5ea6d7c8fc05ad73d930a6fdb430188ff17a70e5 (diff) | |
imx-common: cpu: add imx_ddr_size
Read memory setup registers to determine size
of available ram. This routine works for mx53/mx6x
I need this because when mx6solo called get_ram_size
with a too large maximum size, the system hanged.
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Diffstat (limited to 'arch/arm/imx-common')
| -rw-r--r-- | arch/arm/imx-common/cpu.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/arm/imx-common/cpu.c b/arch/arm/imx-common/cpu.c index 102c254a45..5081908555 100644 --- a/arch/arm/imx-common/cpu.c +++ b/arch/arm/imx-common/cpu.c @@ -65,6 +65,56 @@ char *get_reset_cause(void) } } +#if defined(CONFIG_MX53) || defined(CONFIG_MX6) +#if defined(CONFIG_MX53) +#define MEMCTL_BASE ESDCTL_BASE_ADDR; +#else +#define MEMCTL_BASE MMDC_P0_BASE_ADDR; +#endif +static const unsigned char col_lookup[] = {9, 10, 11, 8, 12, 9, 9, 9}; +static const unsigned char bank_lookup[] = {3, 2}; + +struct esd_mmdc_regs { + uint32_t ctl; + uint32_t pdc; + uint32_t otc; + uint32_t cfg0; + uint32_t cfg1; + uint32_t cfg2; + uint32_t misc; + uint32_t scr; + uint32_t ref; + uint32_t rsvd1; + uint32_t rsvd2; + uint32_t rwd; + uint32_t or; + uint32_t mrr; + uint32_t cfg3lp; + uint32_t mr4; +}; + +#define ESD_MMDC_CTL_GET_ROW(mdctl) ((ctl >> 24) & 7) +#define ESD_MMDC_CTL_GET_COLUMN(mdctl) ((ctl >> 20) & 7) +#define ESD_MMDC_CTL_GET_WIDTH(mdctl) ((ctl >> 16) & 3) +#define ESD_MMDC_CTL_GET_CS1(mdctl) ((ctl >> 30) & 1) +#define ESD_MMDC_MISC_GET_BANK(mdmisc) ((misc >> 5) & 1) + +unsigned imx_ddr_size(void) +{ + struct esd_mmdc_regs *mem = (struct esd_mmdc_regs *)MEMCTL_BASE; + unsigned ctl = readl(&mem->ctl); + unsigned misc = readl(&mem->misc); + int bits = 11 + 0 + 0 + 1; /* row + col + bank + width */ + + bits += ESD_MMDC_CTL_GET_ROW(ctl); + bits += col_lookup[ESD_MMDC_CTL_GET_COLUMN(ctl)]; + bits += bank_lookup[ESD_MMDC_MISC_GET_BANK(misc)]; + bits += ESD_MMDC_CTL_GET_WIDTH(ctl); + bits += ESD_MMDC_CTL_GET_CS1(ctl); + return 1 << bits; +} +#endif + #if defined(CONFIG_DISPLAY_CPUINFO) const char *get_imx_type(u32 imxtype) |