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powerpc/nvram: Enable use Generic NVRAM driver for different size chips

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Remove the reliance on a staticly defined NVRAM size, allowing
platforms to support NVRAMs with sizes differing from the standard.

A fall back value is provided for platforms not supporting this extension.

Signed-off-by: Martyn Welch <[email protected]>
Signed-off-by: Benjamin Herrenschmidt <[email protected]>
This commit is contained in:
Martyn Welch 2009-08-13 09:03:02 +01:00 • committed by Benjamin Herrenschmidt
commit d331d8305c
3 changed files with 31 additions and 7 deletions
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3
arch/powerpc/include/asm/nvram.h
View file

@ -107,6 +107,9 @@ extern void pmac_xpram_write(int xpaddr, u8 data);
/* Synchronize NVRAM */
extern void nvram_sync(void);
/* Determine NVRAM size */
extern ssize_t nvram_get_size(void);
/* Normal access to NVRAM */
extern unsigned char nvram_read_byte(int i);
extern void nvram_write_byte(unsigned char c, int i);

8
arch/powerpc/kernel/setup_32.c
View file

@ -210,6 +210,14 @@ void nvram_write_byte(unsigned char val, int addr)
}
EXPORT_SYMBOL(nvram_write_byte);
ssize_t nvram_get_size(void)
{
if (ppc_md.nvram_size)
return ppc_md.nvram_size();
return -1;
}
EXPORT_SYMBOL(nvram_get_size);
void nvram_sync(void)
{
if (ppc_md.nvram_sync)