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powerpc/pmac: Use string library in nvram code 

- Use memchr_inv to check if the data contains all 0xFF bytes.
  It is faster than looping for each byte.

- Use memcmp to compare memory areas

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
hifive-unleashed-5.1
Akinobu Mita 2012-01-27 04:24:48 +00:00 committed by Benjamin Herrenschmidt
parent ad5b7f1350
commit 2d4b971287
1 changed files with 19 additions and 23 deletions
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42
arch/powerpc/platforms/powermac/nvram.c
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@ -279,7 +279,7 @@ static u32 core99_check(u8* datas)
static int sm_erase_bank(int bank)
{
int stat, i;
int stat;
unsigned long timeout;
u8 __iomem *base = (u8 __iomem *)nvram_data + core99_bank*NVRAM_SIZE;
@ -301,11 +301,10 @@ static int sm_erase_bank(int bank)
out_8(base, SM_FLASH_CMD_CLEAR_STATUS);
out_8(base, SM_FLASH_CMD_RESET);
for (i=0; i<NVRAM_SIZE; i++)
if (base[i] != 0xff) {
printk(KERN_ERR "nvram: Sharp/Micron flash erase failed !\n");
return -ENXIO;
}
if (memchr_inv(base, 0xff, NVRAM_SIZE)) {
printk(KERN_ERR "nvram: Sharp/Micron flash erase failed !\n");
return -ENXIO;
}
return 0;
}
@ -336,17 +335,16 @@ static int sm_write_bank(int bank, u8* datas)
}
out_8(base, SM_FLASH_CMD_CLEAR_STATUS);
out_8(base, SM_FLASH_CMD_RESET);
for (i=0; i<NVRAM_SIZE; i++)
if (base[i] != datas[i]) {
printk(KERN_ERR "nvram: Sharp/Micron flash write failed !\n");
return -ENXIO;
}
if (memcmp(base, datas, NVRAM_SIZE)) {
printk(KERN_ERR "nvram: Sharp/Micron flash write failed !\n");
return -ENXIO;
}
return 0;
}
static int amd_erase_bank(int bank)
{
int i, stat = 0;
int stat = 0;
unsigned long timeout;
u8 __iomem *base = (u8 __iomem *)nvram_data + core99_bank*NVRAM_SIZE;
@ -382,12 +380,11 @@ static int amd_erase_bank(int bank)
/* Reset */
out_8(base, 0xf0);
udelay(1);
for (i=0; i<NVRAM_SIZE; i++)
if (base[i] != 0xff) {
printk(KERN_ERR "nvram: AMD flash erase failed !\n");
return -ENXIO;
}
if (memchr_inv(base, 0xff, NVRAM_SIZE)) {
printk(KERN_ERR "nvram: AMD flash erase failed !\n");
return -ENXIO;
}
return 0;
}
@ -429,11 +426,10 @@ static int amd_write_bank(int bank, u8* datas)
out_8(base, 0xf0);
udelay(1);
for (i=0; i<NVRAM_SIZE; i++)
if (base[i] != datas[i]) {
printk(KERN_ERR "nvram: AMD flash write failed !\n");
return -ENXIO;
}
if (memcmp(base, datas, NVRAM_SIZE)) {
printk(KERN_ERR "nvram: AMD flash write failed !\n");
return -ENXIO;
}
return 0;
}