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authorFinn Thain <fthain@telegraphics.com.au>2019-01-15 15:18:56 +1100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-22 10:21:44 +0100
commit666047fe2a4c9e1bc255ca0549d825b40832886c (patch)
treea21b7111e9252529f9abcc756a373d8c199f1d1e /arch/m68k/atari
parent109b3a89a7c48405d61a05d7a1720581a4f1574c (diff)
m68k/atari: Implement arch_nvram_ops methods and enable CONFIG_HAVE_ARCH_NVRAM_OPS
Atari RTC NVRAM uses a checksum so implement the remaining arch_nvram_ops methods for the set_checksum and initialize ioctls. Enable CONFIG_HAVE_ARCH_NVRAM_OPS. 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>
Diffstat (limited to 'arch/m68k/atari')
-rw-r--r--arch/m68k/atari/nvram.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/m68k/atari/nvram.c b/arch/m68k/atari/nvram.c
index e75adebe6e7d..c347fd206ddf 100644
--- a/arch/m68k/atari/nvram.c
+++ b/arch/m68k/atari/nvram.c
@@ -74,6 +74,26 @@ static void __nvram_set_checksum(void)
__nvram_write_byte(sum, ATARI_CKS_LOC + 1);
}
+static long atari_nvram_set_checksum(void)
+{
+ spin_lock_irq(&rtc_lock);
+ __nvram_set_checksum();
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+}
+
+static long atari_nvram_initialize(void)
+{
+ loff_t i;
+
+ spin_lock_irq(&rtc_lock);
+ for (i = 0; i < NVRAM_BYTES; ++i)
+ __nvram_write_byte(0, i);
+ __nvram_set_checksum();
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+}
+
static ssize_t atari_nvram_read(char *buf, size_t count, loff_t *ppos)
{
char *p = buf;
@@ -113,6 +133,8 @@ static ssize_t atari_nvram_write(char *buf, size_t count, loff_t *ppos)
static ssize_t atari_nvram_get_size(void)
{
+ if (!MACH_IS_ATARI)
+ return -ENODEV;
return NVRAM_BYTES;
}
@@ -120,6 +142,8 @@ const struct nvram_ops arch_nvram_ops = {
.read = atari_nvram_read,
.write = atari_nvram_write,
.get_size = atari_nvram_get_size,
+ .set_checksum = atari_nvram_set_checksum,
+ .initialize = atari_nvram_initialize,
};
EXPORT_SYMBOL(arch_nvram_ops);