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m68k/atari: Implement arch_nvram_ops struct 

By implementing an arch_nvram_ops struct, a platform can re-use the
drivers/char/nvram.c module without needing any arch-specific code
in that module. Atari does so here.

Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Finn Thain 2019-01-15 15:18:56 +11:00 committed by Greg Kroah-Hartman
parent 1278cf66cf
commit a084dbf659
2 changed files with 63 additions and 0 deletions
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49
arch/m68k/atari/nvram.c
View File

@ -74,6 +74,55 @@ static void __nvram_set_checksum(void)
__nvram_write_byte(sum, ATARI_CKS_LOC + 1);
}
static ssize_t atari_nvram_read(char *buf, size_t count, loff_t *ppos)
{
char *p = buf;
loff_t i;
spin_lock_irq(&rtc_lock);
if (!__nvram_check_checksum()) {
spin_unlock_irq(&rtc_lock);
return -EIO;
}
for (i = *ppos; count > 0 && i < NVRAM_BYTES; --count, ++i, ++p)
*p = __nvram_read_byte(i);
spin_unlock_irq(&rtc_lock);
*ppos = i;
return p - buf;
}
static ssize_t atari_nvram_write(char *buf, size_t count, loff_t *ppos)
{
char *p = buf;
loff_t i;
spin_lock_irq(&rtc_lock);
if (!__nvram_check_checksum()) {
spin_unlock_irq(&rtc_lock);
return -EIO;
}
for (i = *ppos; count > 0 && i < NVRAM_BYTES; --count, ++i, ++p)
__nvram_write_byte(*p, i);
__nvram_set_checksum();
spin_unlock_irq(&rtc_lock);
*ppos = i;
return p - buf;
}
static ssize_t atari_nvram_get_size(void)
{
return NVRAM_BYTES;
}
const struct nvram_ops arch_nvram_ops = {
.read = atari_nvram_read,
.write = atari_nvram_write,
.get_size = atari_nvram_get_size,
};
EXPORT_SYMBOL(arch_nvram_ops);
#ifdef CONFIG_PROC_FS
static struct {
unsigned char val;

14
include/linux/nvram.h
View File

@ -5,8 +5,18 @@
#include <linux/errno.h>
#include <uapi/linux/nvram.h>
struct nvram_ops {
ssize_t (*get_size)(void);
ssize_t (*read)(char *, size_t, loff_t *);
ssize_t (*write)(char *, size_t, loff_t *);
};
extern const struct nvram_ops arch_nvram_ops;
static inline ssize_t nvram_get_size(void)
{
if (arch_nvram_ops.get_size)
return arch_nvram_ops.get_size();
return -ENODEV;
}
@ -21,11 +31,15 @@ static inline void nvram_write_byte(unsigned char val, int addr)
static inline ssize_t nvram_read(char *buf, size_t count, loff_t *ppos)
{
if (arch_nvram_ops.read)
return arch_nvram_ops.read(buf, count, ppos);
return -ENODEV;
}
static inline ssize_t nvram_write(char *buf, size_t count, loff_t *ppos)
{
if (arch_nvram_ops.write)
return arch_nvram_ops.write(buf, count, ppos);
return -ENODEV;
}