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>

diff --git a/arch/arm/mach-mx2/pcm038.c b/arch/arm/mach-mx2/pcm038.c
index 91a1e4b..0594644 100644 (file)
--- 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>
@@ -30,6 +31,31 @@
 
 #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]);