From 48f5dd56cf2980ff932c6fd98ff5a2c503cde97b Mon Sep 17 00:00:00 2001 From: Paul Cercueil Date: Thu, 30 Jul 2020 18:12:33 +0200 Subject: [PATCH] MIPS: ingenic: Hardcode mem size for qi,lb60 board Old Device Tree for the qi,lb60 (aka. Ben Nanonote) did not have a 'memory' node. The kernel would then read the memory controller registers to know how much RAM was available. Since every other supported board has had a 'memory' node from the beginning, we can just hardcode a RAM size of 32 MiB when running with an old Device Tree without the 'memory' node. Signed-off-by: Paul Cercueil Signed-off-by: Thomas Bogendoerfer --- arch/mips/jz4740/setup.c | 37 ++++++++----------------------------- 1 file changed, 8 insertions(+), 29 deletions(-) diff --git a/arch/mips/jz4740/setup.c b/arch/mips/jz4740/setup.c index d73c9b722bf3..51d906325ce6 100644 --- a/arch/mips/jz4740/setup.c +++ b/arch/mips/jz4740/setup.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -22,31 +23,6 @@ #include #include -#define JZ4740_EMC_BASE_ADDR 0x13010000 - -#define JZ4740_EMC_SDRAM_CTRL 0x80 - -static void __init jz4740_detect_mem(void) -{ - void __iomem *jz_emc_base; - u32 ctrl, bus, bank, rows, cols; - phys_addr_t size; - - jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100); - ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL); - bus = 2 - ((ctrl >> 31) & 1); - bank = 1 + ((ctrl >> 19) & 1); - cols = 8 + ((ctrl >> 26) & 7); - rows = 11 + ((ctrl >> 20) & 3); - printk(KERN_DEBUG - "SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n", - bus, bank, rows, cols); - iounmap(jz_emc_base); - - size = 1 << (bus + bank + cols + rows); - add_memory_region(0, size, BOOT_MEM_RAM); -} - static unsigned long __init get_board_mach_type(const void *fdt) { if (!fdt_node_check_compatible(fdt, 0, "ingenic,x2000")) @@ -68,13 +44,16 @@ static unsigned long __init get_board_mach_type(const void *fdt) void __init plat_mem_setup(void) { void *dtb = (void *)fw_passed_dtb; - int offset; __dt_setup_arch(dtb); - offset = fdt_path_offset(dtb, "/memory"); - if (offset < 0) - jz4740_detect_mem(); + /* + * Old devicetree files for the qi,lb60 board did not have a /memory + * node. Hardcode the memory info here. + */ + if (!fdt_node_check_compatible(dtb, 0, "qi,lb60") && + fdt_path_offset(dtb, "/memory") < 0) + early_init_dt_add_memory_arch(0, SZ_32M); mips_machtype = get_board_mach_type(dtb); }