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authorDeepak Saxena <dsaxena@plexity.net>2006-01-05 15:59:29 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-01-05 15:59:29 -0500
commit54e269ead6e672325866037b0617a72edd1396b9 (patch)
tree3076c2e0187657daed3054d511b62dc33a4c8f8b /arch/arm/mach-ixp4xx/coyote-setup.c
parent2b9ac7c15c0c5c9d6057b9e297dabaebd208ffe8 (diff)
[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/mach-ixp4xx/coyote-setup.c')
-rw-r--r--arch/arm/mach-ixp4xx/coyote-setup.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/arm/mach-ixp4xx/coyote-setup.c b/arch/arm/mach-ixp4xx/coyote-setup.c
index 050c92768913..679594a73981 100644
--- a/arch/arm/mach-ixp4xx/coyote-setup.c
+++ b/arch/arm/mach-ixp4xx/coyote-setup.c
@@ -14,6 +14,7 @@
14#include <linux/serial.h> 14#include <linux/serial.h>
15#include <linux/tty.h> 15#include <linux/tty.h>
16#include <linux/serial_8250.h> 16#include <linux/serial_8250.h>
17#include <linux/slab.h>
17 18
18#include <asm/types.h> 19#include <asm/types.h>
19#include <asm/setup.h> 20#include <asm/setup.h>
@@ -30,8 +31,6 @@ static struct flash_platform_data coyote_flash_data = {
30}; 31};
31 32
32static struct resource coyote_flash_resource = { 33static struct resource coyote_flash_resource = {
33 .start = COYOTE_FLASH_BASE,
34 .end = COYOTE_FLASH_BASE + COYOTE_FLASH_SIZE - 1,
35 .flags = IORESOURCE_MEM, 34 .flags = IORESOURCE_MEM,
36}; 35};
37 36
@@ -81,6 +80,11 @@ static struct platform_device *coyote_devices[] __initdata = {
81 80
82static void __init coyote_init(void) 81static void __init coyote_init(void)
83{ 82{
83 ixp4xx_sys_init();
84
85 coyote_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
86 coyote_flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + SZ_32M - 1;
87
84 *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE; 88 *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
85 *IXP4XX_EXP_CS1 = *IXP4XX_EXP_CS0; 89 *IXP4XX_EXP_CS1 = *IXP4XX_EXP_CS0;
86 90
@@ -91,8 +95,6 @@ static void __init coyote_init(void)
91 coyote_uart_data[0].irq = IRQ_IXP4XX_UART1; 95 coyote_uart_data[0].irq = IRQ_IXP4XX_UART1;
92 } 96 }
93 97
94
95 ixp4xx_sys_init();
96 platform_add_devices(coyote_devices, ARRAY_SIZE(coyote_devices)); 98 platform_add_devices(coyote_devices, ARRAY_SIZE(coyote_devices));
97} 99}
98 100