pxa/hx4700: Correct StrataFlash block size discovery

The HP iPAQ hx4700 has 128Mb of flash provided by two Intel StrataFlash devices.
The hx4700 platform configuration defines a single 128Mb flash resource,
resulting in the MTD physmap-flash driver probing the first device only and
presuming the second device is identical:

physmap platform flash device: 08000000 at 00000000
physmap-flash: Found 2 x16 devices at 0x0 in 32-bit bank. Manufacturer ID 0x000089 Chip ID 0x008816
physmap-flash: Found 2 x16 devices at 0x4000000 in 32-bit bank
<snip>
erase region 0: offset=0x0,size=0x10000,blocks=4
erase region 1: offset=0x40000,size=0x40000,blocks=255
erase region 2: offset=0x4000000,size=0x10000,blocks=4
erase region 3: offset=0x4040000,size=0x40000,blocks=255
physmap-flash: 2 set(s) of 2 interleaved chips --> 32 partitions of 4096 KiB

Unfortunately the two devices are not identical. The first has a device ID of
0x8816, identifying a bottom parameter device. The second has a device ID of
0x8813, identifying a top parameter device. By not probing the second device,
physmap-flash does not discover the correct block sizes.

This patch splits the configuration into two 64Mb flash resources, forcing
physmap-flash to probe both devices and thus discover the correct block sizes:

physmap platform flash device: 04000000 at 00000000
physmap-flash: Found 2 x16 devices at 0x0 in 32-bit bank. Manufacturer ID 0x000089 Chip ID 0x008816
<snip>
erase region 0: offset=0x0,size=0x10000,blocks=4
erase region 1: offset=0x40000,size=0x40000,blocks=255
physmap-flash: 1 set(s) of 2 interleaved chips --> 16 partitions of 4096 KiB
physmap platform flash device: 04000000 at 04000000
physmap-flash: Found 2 x16 devices at 0x0 in 32-bit bank. Manufacturer ID 0x000089 Chip ID 0x008813
<snip>
erase region 0: offset=0x0,size=0x40000,blocks=255
erase region 1: offset=0x3fc0000,size=0x10000,blocks=4
physmap-flash: 1 set(s) of 2 interleaved chips --> 16 partitions of 4096 KiB
Concatenating MTD devices:
(0): "physmap-flash"
(1): "physmap-flash"
into device "physmap-flash"

Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>

diff --git a/arch/arm/mach-pxa/hx4700.c b/arch/arm/mach-pxa/hx4700.c
index fb9b62d..de877a9 100644 (file)
--- a/arch/arm/mach-pxa/hx4700.c
+++ b/arch/arm/mach-pxa/hx4700.c
@@ -704,10 +704,9 @@ static void hx4700_set_vpp(struct platform_device *pdev, int vpp)
        gpio_set_value(GPIO91_HX4700_FLASH_VPEN, vpp);
 }
 
-static struct resource strataflash_resource = {
-       .start = PXA_CS0_PHYS,
-       .end   = PXA_CS0_PHYS + SZ_128M - 1,
-       .flags = IORESOURCE_MEM,
+static struct resource strataflash_resource[] = {
+       [0] = DEFINE_RES_MEM(PXA_CS0_PHYS, SZ_64M),
+       [1] = DEFINE_RES_MEM(PXA_CS0_PHYS + SZ_64M, SZ_64M),
 };
 
 static struct physmap_flash_data strataflash_data = {
@@ -718,8 +717,8 @@ static struct physmap_flash_data strataflash_data = {
 static struct platform_device strataflash = {
        .name          = "physmap-flash",
        .id            = -1,
-       .resource      = &strataflash_resource,
-       .num_resources = 1,
+       .resource      = strataflash_resource,
+       .num_resources = ARRAY_SIZE(strataflash_resource),
        .dev = {
                .platform_data = &strataflash_data,
        },