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authorDeepak Saxena <dsaxena@plexity.net>2006-01-05 20:59:29 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-01-05 20:59:29 +0000
commit54e269ead6e672325866037b0617a72edd1396b9 (patch)
tree3076c2e0187657daed3054d511b62dc33a4c8f8b /arch/arm
parent2b9ac7c15c0c5c9d6057b9e297dabaebd208ffe8 (diff)
downloadop-kernel-dev-54e269ead6e672325866037b0617a72edd1396b9.zip
op-kernel-dev-54e269ead6e672325866037b0617a72edd1396b9.tar.gz
[ARM] 3226/1: IXP4xx runtime expansion bus window size configuration
Patch from Deepak Saxena The expansion bus on the IXP46x NPU can be configured for either 32MiB or 16MiB windows and changing the configuration causes the base address for each chip select for each region to change. Because of this, we cannot hardcode the physical base as we currently do. This patch checks the expansion bus configuration registers at runtime to determine the appropriate window size. Note that this requires that the bootloader already configured the device sizes appropriately, but I feel that is valid assumption to make as the bootloader must configure and access the flash window, the output display (LCD, LEDs, etc) window, and other expansion bus devices. Signed-off-by: Deepak Saxena <dsaxena@plexity.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-ixp4xx/common.c16
-rw-r--r--arch/arm/mach-ixp4xx/coyote-setup.c10
-rw-r--r--arch/arm/mach-ixp4xx/gtwx5715-setup.c15
-rw-r--r--arch/arm/mach-ixp4xx/ixdp425-setup.c13
-rw-r--r--arch/arm/mach-ixp4xx/nas100d-setup.c6
5 files changed, 41 insertions, 19 deletions
diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index 9f33cb2..6b39369 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -332,11 +332,27 @@ static struct platform_device *ixp46x_devices[] __initdata = {
&ixp46x_i2c_controller
};
+unsigned long ixp4xx_exp_bus_size;
+
void __init ixp4xx_sys_init(void)
{
+ ixp4xx_exp_bus_size = SZ_16M;
+
if (cpu_is_ixp46x()) {
+ int region;
+
platform_add_devices(ixp46x_devices,
ARRAY_SIZE(ixp46x_devices));
+
+ for (region = 0; region < 7; region++) {
+ if((*(IXP4XX_EXP_REG(0x4 * region)) & 0x200)) {
+ ixp4xx_exp_bus_size = SZ_32M;
+ break;
+ }
+ }
}
+
+ printk("IXP4xx: Using %uMiB expansion bus window size\n",
+ ixp4xx_exp_bus_size >> 20);
}
diff --git a/arch/arm/mach-ixp4xx/coyote-setup.c b/arch/arm/mach-ixp4xx/coyote-setup.c
index 050c927..679594a 100644
--- a/arch/arm/mach-ixp4xx/coyote-setup.c
+++ b/arch/arm/mach-ixp4xx/coyote-setup.c
@@ -14,6 +14,7 @@
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_8250.h>
+#include <linux/slab.h>
#include <asm/types.h>
#include <asm/setup.h>
@@ -30,8 +31,6 @@ static struct flash_platform_data coyote_flash_data = {
};
static struct resource coyote_flash_resource = {
- .start = COYOTE_FLASH_BASE,
- .end = COYOTE_FLASH_BASE + COYOTE_FLASH_SIZE - 1,
.flags = IORESOURCE_MEM,
};
@@ -81,6 +80,11 @@ static struct platform_device *coyote_devices[] __initdata = {
static void __init coyote_init(void)
{
+ ixp4xx_sys_init();
+
+ coyote_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
+ coyote_flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + SZ_32M - 1;
+
*IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
*IXP4XX_EXP_CS1 = *IXP4XX_EXP_CS0;
@@ -91,8 +95,6 @@ static void __init coyote_init(void)
coyote_uart_data[0].irq = IRQ_IXP4XX_UART1;
}
-
- ixp4xx_sys_init();
platform_add_devices(coyote_devices, ARRAY_SIZE(coyote_devices));
}
diff --git a/arch/arm/mach-ixp4xx/gtwx5715-setup.c b/arch/arm/mach-ixp4xx/gtwx5715-setup.c
index 29a6d02..0386704 100644
--- a/arch/arm/mach-ixp4xx/gtwx5715-setup.c
+++ b/arch/arm/mach-ixp4xx/gtwx5715-setup.c
@@ -27,6 +27,7 @@
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_8250.h>
+#include <linux/slab.h>
#include <asm/types.h>
#include <asm/setup.h>
@@ -106,11 +107,9 @@ static struct flash_platform_data gtwx5715_flash_data = {
.width = 2,
};
-static struct resource gtwx5715_flash_resource = {
- .start = GTWX5715_FLASH_BASE,
- .end = GTWX5715_FLASH_BASE + GTWX5715_FLASH_SIZE - 1,
+static struct gtw5715_flash_resource = {
.flags = IORESOURCE_MEM,
-};
+}
static struct platform_device gtwx5715_flash = {
.name = "IXP4XX-Flash",
@@ -129,6 +128,14 @@ static struct platform_device *gtwx5715_devices[] __initdata = {
static void __init gtwx5715_init(void)
{
+ ixp4xx_sys_init();
+
+ if (!flash_resource)
+ printk(KERN_ERR "Could not allocate flash resource\n");
+
+ gtwx5715_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
+ gtwx5715_flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + SZ_8M - 1;
+
platform_add_devices(gtwx5715_devices, ARRAY_SIZE(gtwx5715_devices));
}
diff --git a/arch/arm/mach-ixp4xx/ixdp425-setup.c b/arch/arm/mach-ixp4xx/ixdp425-setup.c
index 3a22d84e..c2e105c 100644
--- a/arch/arm/mach-ixp4xx/ixdp425-setup.c
+++ b/arch/arm/mach-ixp4xx/ixdp425-setup.c
@@ -14,6 +14,7 @@
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_8250.h>
+#include <linux/slab.h>
#include <asm/types.h>
#include <asm/setup.h>
@@ -30,8 +31,6 @@ static struct flash_platform_data ixdp425_flash_data = {
};
static struct resource ixdp425_flash_resource = {
- .start = IXDP425_FLASH_BASE,
- .end = IXDP425_FLASH_BASE + IXDP425_FLASH_SIZE - 1,
.flags = IORESOURCE_MEM,
};
@@ -108,17 +107,13 @@ static struct platform_device *ixdp425_devices[] __initdata = {
&ixdp425_uart
};
-
static void __init ixdp425_init(void)
{
ixp4xx_sys_init();
- /*
- * IXP465 has 32MB window
- */
- if (machine_is_ixdp465()) {
- ixdp425_flash_resource.end += IXDP425_FLASH_SIZE;
- }
+ ixdp425_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
+ ixdp425_flash_resource.end =
+ IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
platform_add_devices(ixdp425_devices, ARRAY_SIZE(ixdp425_devices));
}
diff --git a/arch/arm/mach-ixp4xx/nas100d-setup.c b/arch/arm/mach-ixp4xx/nas100d-setup.c
index bde9648..49998a8 100644
--- a/arch/arm/mach-ixp4xx/nas100d-setup.c
+++ b/arch/arm/mach-ixp4xx/nas100d-setup.c
@@ -26,8 +26,6 @@ static struct flash_platform_data nas100d_flash_data = {
};
static struct resource nas100d_flash_resource = {
- .start = NAS100D_FLASH_BASE,
- .end = NAS100D_FLASH_BASE + NAS100D_FLASH_SIZE,
.flags = IORESOURCE_MEM,
};
@@ -115,6 +113,10 @@ static void __init nas100d_init(void)
{
ixp4xx_sys_init();
+ nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
+ nas100d_flash_resource.end =
+ IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
+
pm_power_off = nas100d_power_off;
platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
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