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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2008-11-23 19:31:46 +0300 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2008-12-16 16:57:54 +0300 |
| commit | 3620c0dccfd35cd39324508d8c962d10f9a44ead (patch) | |
| tree | aae95d2640fb8d07435b472a4baf845f21d565f0 /arch/arm/mach-mx2/pcm038.c | |
| parent | 4a7b98d7e7f1c05331bfa82e2427f896e57de35b (diff) | |
| download | linux-3620c0dccfd35cd39324508d8c962d10f9a44ead.tar.xz | |
pcm038: add driver for static ram
The pcm038 module (phyCORE-i.MX27) comes with a 512 KiB static RAM which
can be battery buffered. Add mtd_ram support and configure the chip select
line, to which the sram is attached.
Signed-off-by: Luotao Fu <l.fu@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-mx2/pcm038.c')
| -rw-r--r-- | arch/arm/mach-mx2/pcm038.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/arm/mach-mx2/pcm038.c b/arch/arm/mach-mx2/pcm038.c index 91a1e4bbccbc..0594644b4057 100644 --- a/arch/arm/mach-mx2/pcm038.c +++ b/arch/arm/mach-mx2/pcm038.c @@ -19,6 +19,7 @@ #include <linux/platform_device.h> #include <linux/mtd/physmap.h> +#include <linux/mtd/plat-ram.h> #include <asm/mach/arch.h> #include <asm/mach-types.h> #include <mach/common.h> @@ -31,6 +32,31 @@ #include "devices.h" /* + * Phytec's PCM038 comes with 2MiB battery buffered SRAM, + * 16 bit width + */ + +static struct platdata_mtd_ram pcm038_sram_data = { + .bankwidth = 2, +}; + +static struct resource pcm038_sram_resource = { + .start = CS1_BASE_ADDR, + .end = CS1_BASE_ADDR + 512 * 1024 - 1, + .flags = IORESOURCE_MEM, +}; + +static struct platform_device pcm038_sram_mtd_device = { + .name = "mtd-ram", + .id = 0, + .dev = { + .platform_data = &pcm038_sram_data, + }, + .num_resources = 1, + .resource = &pcm038_sram_resource, +}; + +/* * Phytec's phyCORE-i.MX27 comes with 32MiB flash, * 16 bit width */ @@ -164,11 +190,22 @@ static void gpio_fec_inactive(void) static struct platform_device *platform_devices[] __initdata = { &pcm038_nor_mtd_device, &mxc_w1_master_device, + &pcm038_sram_mtd_device, }; +/* On pcm038 there's a sram attached to CS1, we enable the chipselect here and + * setup other stuffs to access the sram. */ +static void __init pcm038_init_sram(void) +{ + __raw_writel(0x0000d843, CSCR_U(1)); + __raw_writel(0x22252521, CSCR_L(1)); + __raw_writel(0x22220a00, CSCR_A(1)); +} + static void __init pcm038_init(void) { gpio_fec_active(); + pcm038_init_sram(); mxc_register_device(&mxc_uart_device0, &uart_pdata[0]); mxc_register_device(&mxc_uart_device1, &uart_pdata[1]); |