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authorMartyn Welch <martyn.welch@gefanuc.com>2009-07-02 06:12:18 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-20 10:29:22 +1000
commit690a2d074ead1867ca5a1976284ca1c89ebc04c6 (patch)
tree2d82a04036c49e01c7de1d57bdc976b6878c6347
parentae142e0c52b38e44d28b12f77c6e7faa96f7a069 (diff)
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>
-rw-r--r--arch/powerpc/sysdev/mmio_nvram.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/mmio_nvram.c b/arch/powerpc/sysdev/mmio_nvram.c
index 7b49633a4bd..20732420906 100644
--- a/arch/powerpc/sysdev/mmio_nvram.c
+++ b/arch/powerpc/sysdev/mmio_nvram.c
@@ -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;