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authorSascha Hauer <s.hauer@pengutronix.de>2008-11-23 17:31:46 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2008-12-16 14:57:54 +0100
commit3620c0dccfd35cd39324508d8c962d10f9a44ead (patch)
treeaae95d2640fb8d07435b472a4baf845f21d565f0 /arch/arm/mach-mx2
parent4a7b98d7e7f1c05331bfa82e2427f896e57de35b (diff)
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')
-rw-r--r--arch/arm/mach-mx2/pcm038.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/arm/mach-mx2/pcm038.c b/arch/arm/mach-mx2/pcm038.c
index 91a1e4bbccb..0594644b405 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]);