diff options
Diffstat (limited to 'arch/arm/mach-clps711x/board-autcpu12.c')
| -rw-r--r-- | arch/arm/mach-clps711x/board-autcpu12.c | 68 |
1 files changed, 56 insertions, 12 deletions
diff --git a/arch/arm/mach-clps711x/board-autcpu12.c b/arch/arm/mach-clps711x/board-autcpu12.c index 3e22d0b1a9c5..91a3ab50fc20 100644 --- a/arch/arm/mach-clps711x/board-autcpu12.c +++ b/arch/arm/mach-clps711x/board-autcpu12.c @@ -27,6 +27,7 @@ #include <linux/ioport.h> #include <linux/interrupt.h> #include <linux/mtd/physmap.h> +#include <linux/mtd/plat-ram.h> #include <linux/mtd/partitions.h> #include <linux/mtd/nand-gpio.h> #include <linux/platform_device.h> @@ -49,6 +50,9 @@ /* NOR flash */ #define AUTCPU12_FLASH_BASE (CS0_PHYS_BASE) +/* NVRAM */ +#define AUTCPU12_NVRAM_BASE (CS1_PHYS_BASE + 0x02000000) + /* SmartMedia flash */ #define AUTCPU12_SMC_BASE (CS1_PHYS_BASE + 0x06000000) #define AUTCPU12_SMC_SEL_BASE (AUTCPU12_SMC_BASE + 0x10) @@ -74,17 +78,6 @@ static struct resource autcpu12_cs8900_resource[] __initdata = { DEFINE_RES_IRQ(AUTCPU12_CS8900_IRQ), }; -static struct resource autcpu12_nvram_resource[] __initdata = { - DEFINE_RES_MEM_NAMED(AUTCPU12_PHYS_NVRAM, SZ_128K, "SRAM"), -}; - -static struct platform_device autcpu12_nvram_pdev __initdata = { - .name = "autcpu12_nvram", - .id = -1, - .resource = autcpu12_nvram_resource, - .num_resources = ARRAY_SIZE(autcpu12_nvram_resource), -}; - static struct resource autcpu12_nand_resource[] __initdata = { DEFINE_RES_MEM(AUTCPU12_SMC_BASE, SZ_16), }; @@ -194,6 +187,57 @@ static struct platform_device autcpu12_flash_pdev __initdata = { }, }; +static struct resource autcpu12_nvram_resource[] __initdata = { + DEFINE_RES_MEM(AUTCPU12_NVRAM_BASE, 0), +}; + +static struct platdata_mtd_ram autcpu12_nvram_pdata = { + .bankwidth = 4, +}; + +static struct platform_device autcpu12_nvram_pdev __initdata = { + .name = "mtd-ram", + .id = 0, + .resource = autcpu12_nvram_resource, + .num_resources = ARRAY_SIZE(autcpu12_nvram_resource), + .dev = { + .platform_data = &autcpu12_nvram_pdata, + }, +}; + +static void __init autcpu12_nvram_init(void) +{ + void __iomem *nvram; + unsigned int save[2]; + resource_size_t nvram_size = SZ_128K; + + /* + * Check for 32K/128K + * Read ofs 0K + * Read ofs 64K + * Write complement to ofs 64K + * Read and check result on ofs 0K + * Restore contents + */ + nvram = ioremap(autcpu12_nvram_resource[0].start, SZ_128K); + if (nvram) { + save[0] = readl(nvram + 0); + save[1] = readl(nvram + SZ_64K); + writel(~save[0], nvram + SZ_64K); + if (readl(nvram + 0) != save[0]) { + writel(save[0], nvram + 0); + nvram_size = SZ_32K; + } else + writel(save[1], nvram + SZ_64K); + iounmap(nvram); + + autcpu12_nvram_resource[0].end = + autcpu12_nvram_resource[0].start + nvram_size - 1; + platform_device_register(&autcpu12_nvram_pdev); + } else + pr_err("Failed to remap NVRAM resource\n"); +} + static void __init autcpu12_init(void) { clps711x_devices_init(); @@ -202,7 +246,7 @@ static void __init autcpu12_init(void) platform_device_register_simple("cs89x0", 0, autcpu12_cs8900_resource, ARRAY_SIZE(autcpu12_cs8900_resource)); platform_device_register(&autcpu12_mmgpio_pdev); - platform_device_register(&autcpu12_nvram_pdev); + autcpu12_nvram_init(); } static void __init autcpu12_init_late(void) |