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powerpc/nvram: Allow byte length reads from mmio NVRAM driver 

Add a byte length read and write interface compatible with the
nvram_generic driver interface to the mmio driver.

Signed-off-by: Martyn Welch <martyn.welch@gefanuc.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Martyn Welch 2009-07-02 06:12:18 +00:00 committed by Benjamin Herrenschmidt
parent ae142e0c52
commit 690a2d074e
1 changed files with 32 additions and 0 deletions
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32
arch/powerpc/sysdev/mmio_nvram.c
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@ -53,6 +53,23 @@ static ssize_t mmio_nvram_read(char *buf, size_t count, loff_t *index)
return count;
}
static unsigned char mmio_nvram_read_val(int addr)
{
unsigned long flags;
unsigned char val;
if (addr >= mmio_nvram_len)
return 0xff;
spin_lock_irqsave(&mmio_nvram_lock, flags);
val = ioread8(mmio_nvram_start + addr);
spin_unlock_irqrestore(&mmio_nvram_lock, flags);
return val;
}
static ssize_t mmio_nvram_write(char *buf, size_t count, loff_t *index)
{
unsigned long flags;
@ -72,6 +89,19 @@ static ssize_t mmio_nvram_write(char *buf, size_t count, loff_t *index)
return count;
}
void mmio_nvram_write_val(int addr, unsigned char val)
{
unsigned long flags;
if (addr < mmio_nvram_len) {
spin_lock_irqsave(&mmio_nvram_lock, flags);
iowrite8(val, mmio_nvram_start + addr);
spin_unlock_irqrestore(&mmio_nvram_lock, flags);
}
}
static ssize_t mmio_nvram_get_size(void)
{
return mmio_nvram_len;
@ -114,6 +144,8 @@ int __init mmio_nvram_init(void)
printk(KERN_INFO "mmio NVRAM, %luk at 0x%lx mapped to %p\n",
mmio_nvram_len >> 10, nvram_addr, mmio_nvram_start);
ppc_md.nvram_read_val = mmio_nvram_read_val;
ppc_md.nvram_write_val = mmio_nvram_write_val;
ppc_md.nvram_read = mmio_nvram_read;
ppc_md.nvram_write = mmio_nvram_write;
ppc_md.nvram_size = mmio_nvram_get_size;