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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>
This commit is contained in:
Sascha Hauer 2008-11-23 17:31:46 +01:00
parent 4a7b98d7e7
commit 3620c0dccf
1 changed files with 37 additions and 0 deletions
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37
arch/arm/mach-mx2/pcm038.c
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@ -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]);