MIPS: ralink: add memory definition for RT305x
Populate struct soc_info with the data that describes our RAM window.
As memory detection fails on RT5350 we read the amount of available memory
from the system controller.
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/5180/
diff --git a/arch/mips/ralink/rt305x.c b/arch/mips/ralink/rt305x.c
index 6aa3cb1..ca7ee3a 100644
--- a/arch/mips/ralink/rt305x.c
+++ b/arch/mips/ralink/rt305x.c
@@ -122,6 +122,40 @@
.wdt_reset = rt305x_wdt_reset,
};
+static unsigned long rt5350_get_mem_size(void)
+{
+ void __iomem *sysc = (void __iomem *) KSEG1ADDR(RT305X_SYSC_BASE);
+ unsigned long ret;
+ u32 t;
+
+ t = __raw_readl(sysc + SYSC_REG_SYSTEM_CONFIG);
+ t = (t >> RT5350_SYSCFG0_DRAM_SIZE_SHIFT) &
+ RT5350_SYSCFG0_DRAM_SIZE_MASK;
+
+ switch (t) {
+ case RT5350_SYSCFG0_DRAM_SIZE_2M:
+ ret = 2;
+ break;
+ case RT5350_SYSCFG0_DRAM_SIZE_8M:
+ ret = 8;
+ break;
+ case RT5350_SYSCFG0_DRAM_SIZE_16M:
+ ret = 16;
+ break;
+ case RT5350_SYSCFG0_DRAM_SIZE_32M:
+ ret = 32;
+ break;
+ case RT5350_SYSCFG0_DRAM_SIZE_64M:
+ ret = 64;
+ break;
+ default:
+ panic("rt5350: invalid DRAM size: %u", t);
+ break;
+ }
+
+ return ret;
+}
+
void __init ralink_clk_init(void)
{
unsigned long cpu_rate, sys_rate, wdt_rate, uart_rate;
@@ -252,4 +286,15 @@
name,
(id >> CHIP_ID_ID_SHIFT) & CHIP_ID_ID_MASK,
(id & CHIP_ID_REV_MASK));
+
+ soc_info->mem_base = RT305X_SDRAM_BASE;
+ if (soc_is_rt5350()) {
+ soc_info->mem_size = rt5350_get_mem_size();
+ } else if (soc_is_rt305x() || soc_is_rt3350()) {
+ soc_info->mem_size_min = RT305X_MEM_SIZE_MIN;
+ soc_info->mem_size_max = RT305X_MEM_SIZE_MAX;
+ } else if (soc_is_rt3352()) {
+ soc_info->mem_size_min = RT3352_MEM_SIZE_MIN;
+ soc_info->mem_size_max = RT3352_MEM_SIZE_MAX;
+ }
}