diff options
Diffstat (limited to 'kernel/arch/mips/jz4740/setup.c')
-rw-r--r-- | kernel/arch/mips/jz4740/setup.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/kernel/arch/mips/jz4740/setup.c b/kernel/arch/mips/jz4740/setup.c new file mode 100644 index 000000000..ef796f97b --- /dev/null +++ b/kernel/arch/mips/jz4740/setup.c @@ -0,0 +1,61 @@ +/* + * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> + * Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org> + * JZ4740 setup code + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> + +#include <asm/bootinfo.h> + +#include <asm/mach-jz4740/base.h> + +#include "reset.h" + + +#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); +} + +void __init plat_mem_setup(void) +{ + jz4740_reset_init(); + jz4740_detect_mem(); +} + +const char *get_system_type(void) +{ + return "JZ4740"; +} |