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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2018-08-13 15:02:52 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2018-08-14 08:54:40 +0200 |
| commit | 7158c5987e6999f1fd89b7170c685a7b29bc8322 (patch) | |
| tree | 8d40a826970a118e427aab268cdd2b83e59aaddf /arch/arm/mach-mxs | |
| parent | 1c1f94ecc2cf658b751847306a913acc209af64d (diff) | |
| download | barebox-7158c5987e6999f1fd89b7170c685a7b29bc8322.tar.gz barebox-7158c5987e6999f1fd89b7170c685a7b29bc8322.tar.xz | |
ARM: i.MX23: Add memory size detection
No need for the boards to manually add memory, we can do this
automatically by reading back the memory size from the SDRAM
controller.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Roland Hieber <r.hieber@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-mxs')
| -rw-r--r-- | arch/arm/mach-mxs/include/mach/imx23.h | 29 | ||||
| -rw-r--r-- | arch/arm/mach-mxs/soc-imx23.c | 4 |
2 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm/mach-mxs/include/mach/imx23.h b/arch/arm/mach-mxs/include/mach/imx23.h new file mode 100644 index 0000000000..56e76d5f50 --- /dev/null +++ b/arch/arm/mach-mxs/include/mach/imx23.h @@ -0,0 +1,29 @@ +#ifndef __MACH_IMX23_H +#define __MACH_IMX23_H + +#include <linux/bitfield.h> +#include <io.h> + +#define DRAM_CTL14_CS0_EN BIT(0) +#define DRAM_CTL14_CS1_EN BIT(1) +#define DRAM_CTL11_COLUMNS_DIFF GENMASK(10, 8) +#define DRAM_CTL10_ROWS_DIFF GENMASK(18, 16) + +#define DRAM_CTL(n) (IMX_SDRAMC_BASE + 4 * (n)) + +static inline u32 imx23_get_memsize(void) +{ + u32 ctl10 = readl(DRAM_CTL(10)); + u32 ctl11 = readl(DRAM_CTL(11)); + u32 ctl14 = readl(DRAM_CTL(14)); + int rows, columns, banks = 4, cs0, cs1; + + columns = 12 - FIELD_GET(DRAM_CTL11_COLUMNS_DIFF, ctl11); + rows = 13 - FIELD_GET(DRAM_CTL10_ROWS_DIFF, ctl10); + cs0 = FIELD_GET(DRAM_CTL14_CS0_EN, ctl14); + cs1 = FIELD_GET(DRAM_CTL14_CS1_EN, ctl14); + + return (1 << columns) * (1 << rows) * banks * (cs0 + cs1); +} + +#endif /* __MACH_IMX23_H */
\ No newline at end of file diff --git a/arch/arm/mach-mxs/soc-imx23.c b/arch/arm/mach-mxs/soc-imx23.c index d471c8eb5c..f25fff18c3 100644 --- a/arch/arm/mach-mxs/soc-imx23.c +++ b/arch/arm/mach-mxs/soc-imx23.c @@ -19,6 +19,8 @@ #include <restart.h> #include <mach/imx23-regs.h> #include <io.h> +#include <asm/memory.h> +#include <mach/imx23.h> #define HW_CLKCTRL_RESET 0x120 # define HW_CLKCTRL_RESET_CHIP (1 << 1) @@ -37,6 +39,8 @@ static void __noreturn imx23_restart_soc(struct restart_handler *rst) static int imx23_devices_init(void) { + arm_add_mem_device("ram0", IMX_MEMORY_BASE, imx23_get_memsize()); + if (of_get_root_node()) return 0; |