From 3ca564e96e90a4714147262c9d201e077ef54a26 Mon Sep 17 00:00:00 2001 From: Amit Singh Tomar Date: Sat, 9 May 2020 13:45:07 +0530 Subject: [PATCH] Actions: OWL: Calculate SDRAM size Calculate the SDRAM size from DDR capacity register registers instead of using hard-coded value. This is quite useful to get correct size on differnt boards based on Actions OWL family of SoCs (S700 and S900). There is no documentation available that talks about DDR registers, and this is very much taken from vendor source. This commit lets Linux boot on Cubieboard7-lite(based on S700). Signed-off-by: Amit Singh Tomar Reviewed-by: Manivannan Sadhasivam --- arch/arm/mach-owl/soc.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/arch/arm/mach-owl/soc.c b/arch/arm/mach-owl/soc.c index 7d3f6f6285..fd6ee7c1c0 100644 --- a/arch/arm/mach-owl/soc.c +++ b/arch/arm/mach-owl/soc.c @@ -15,14 +15,34 @@ #include #include +#define DMM_INTERLEAVE_PER_CH_CFG 0xe0290028 + DECLARE_GLOBAL_DATA_PTR; +unsigned int owl_get_ddrcap(void) +{ + unsigned int val, cap; + + /* ddr capacity register initialized by ddr driver + * in early bootloader + */ +#if defined(CONFIG_MACH_S700) + val = (readl(DMM_INTERLEAVE_PER_CH_CFG) >> 8) & 0x7; + cap = (val + 1) * 256; +#elif defined(CONFIG_MACH_S900) + val = (readl(DMM_INTERLEAVE_PER_CH_CFG) >> 8) & 0xf; + cap = 64 * (1 << val); +#endif + + return cap; +} + /* * dram_init - sets uboots idea of sdram size */ int dram_init(void) { - gd->ram_size = CONFIG_SYS_SDRAM_SIZE; + gd->ram_size = owl_get_ddrcap() * 1024 * 1024; return 0; } -- 2.39.5