[PATCH v9 10/22] m68k/atari: Implement arch_nvram_ops methods and enable CONFIG_HAVE_ARCH_NVRAM_OPS

Finn Thain
2019-01-15T04:23:10Z

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>
---
Changed since v8:
- Moved the HAVE_ARCH_NVRAM_OPS symbol to common code as suggested by
Christoph Hellwig.
- Renamed functions to avoid name collisions with nvram.h.

Changed since v7:
- Changed the default for CONFIG_NVRAM, because "select NVRAM" was
removed from ATARI_SCSI in patch 1.
---
arch/Kconfig | 3 +++
arch/m68k/Kconfig.machine | 1 +
arch/m68k/atari/nvram.c | 24 ++++++++++++++++++++++++
drivers/char/Kconfig | 3 ++-
4 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 4cfb6de48f79..87393fb8141c 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -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

diff --git a/arch/m68k/Kconfig.machine b/arch/m68k/Kconfig.machine
index 328ba83d735b..ad584e3eb8f7 100644
--- a/arch/m68k/Kconfig.machine
+++ b/arch/m68k/Kconfig.machine
@@ -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
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);

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index a8cac68de177..ce9979529cf3 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -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"),
--
2.19.2