diff options
author | Martyn Welch <martyn.welch@gefanuc.com> | 2009-07-02 06:12:18 +0000 |
---|---|---|
committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-08-20 10:29:22 +1000 |
commit | 690a2d074ead1867ca5a1976284ca1c89ebc04c6 (patch) | |
tree | 2d82a04036c49e01c7de1d57bdc976b6878c6347 /arch/powerpc/sysdev | |
parent | ae142e0c52b38e44d28b12f77c6e7faa96f7a069 (diff) | |
download | kernel_samsung_crespo-690a2d074ead1867ca5a1976284ca1c89ebc04c6.zip kernel_samsung_crespo-690a2d074ead1867ca5a1976284ca1c89ebc04c6.tar.gz kernel_samsung_crespo-690a2d074ead1867ca5a1976284ca1c89ebc04c6.tar.bz2 |
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>
Diffstat (limited to 'arch/powerpc/sysdev')
-rw-r--r-- | arch/powerpc/sysdev/mmio_nvram.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/mmio_nvram.c b/arch/powerpc/sysdev/mmio_nvram.c index 7b49633a..2073242 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; |