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m68k/atari: Implement arch_nvram_ops methods and enable CONFIG_HAVE_ARCH_NVRAM_OPS

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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>
This commit is contained in:
Finn Thain 2019-01-15 15:18:56 +11:00 committed by Greg Kroah-Hartman
parent 109b3a89a7
commit 666047fe2a
4 changed files with 30 additions and 1 deletions
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3
arch/Kconfig
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@ -701,6 +701,9 @@ config HAVE_ARCH_HASH
file which provides platform-specific implementations of some
functions in <linux/hash.h> or fs/namei.c.
config HAVE_ARCH_NVRAM_OPS
bool
config ISA_BUS_API
def_bool ISA

1
arch/m68k/Kconfig.machine
View File

@ -16,6 +16,7 @@ config ATARI
bool "Atari support"
depends on MMU
select MMU_MOTOROLA if MMU
select HAVE_ARCH_NVRAM_OPS
help
This option enables support for the 68000-based Atari series of
computers (including the TT, Falcon and Medusa). If you plan to use

24
arch/m68k/atari/nvram.c
View File

@ -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);

3
drivers/char/Kconfig
View File

@ -244,7 +244,8 @@ source "drivers/char/hw_random/Kconfig"
config NVRAM
tristate "/dev/nvram support"
depends on X86 || GENERIC_NVRAM
depends on X86 || GENERIC_NVRAM || HAVE_ARCH_NVRAM_OPS
default M68K
---help---
If you say Y here and create a character special file /dev/nvram
with major number 10 and minor number 144 using mknod ("man mknod"),