From 690a2d074ead1867ca5a1976284ca1c89ebc04c6 Mon Sep 17 00:00:00 2001 From: Martyn Welch Date: Thu, 2 Jul 2009 06:12:18 +0000 Subject: 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 Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/sysdev/mmio_nvram.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'arch/powerpc/sysdev/mmio_nvram.c') 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; -- cgit v1.2.3-70-g09d2