[OpenBIOS] [PATCH 1/2] sparc64: use MMIO for NVRAM access
Artyom Tarasenko
atar4qemu at gmail.com
Sat Apr 27 09:13:43 CEST 2013
Use MMIO for accessing the m48t08 NVRAM chip.
This patch is a counterpart of a QEMU change.
Signed-off-by: Artyom Tarasenko <atar4qemu at gmail.com>
---
arch/sparc64/openbios.c | 30 ++++++++----------------------
1 files changed, 8 insertions(+), 22 deletions(-)
diff --git a/arch/sparc64/openbios.c b/arch/sparc64/openbios.c
index a6c956a..2e70a9d 100644
--- a/arch/sparc64/openbios.c
+++ b/arch/sparc64/openbios.c
@@ -26,9 +26,7 @@
#define UUID_FMT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x"
-#define NVRAM_ADDR_LO 0x74
-#define NVRAM_ADDR_HI 0x75
-#define NVRAM_DATA 0x77
+#define NVRAM_BASE 0x02000
#define APB_SPECIAL_BASE 0x1fe00000000ULL
#define APB_MEM_BASE 0x1ff00000000ULL
@@ -40,7 +38,7 @@
#define NVRAM_IDPROM 0x1fd8
#define NVRAM_IDPROM_SIZE 32
#define NVRAM_OB_START (0)
-#define NVRAM_OB_SIZE ((0x1fd0 - NVRAM_OB_START) & ~15)
+#define NVRAM_OB_SIZE ((NVRAM_IDPROM - NVRAM_OB_START) & ~15)
static uint8_t idprom[NVRAM_IDPROM_SIZE];
@@ -333,34 +331,22 @@ id_cpu(void)
for (;;);
}
-static uint8_t nvram_read_byte(uint16_t offset)
-{
- outb(offset & 0xff, NVRAM_ADDR_LO);
- outb(offset >> 8, NVRAM_ADDR_HI);
- return inb(NVRAM_DATA);
-}
-
static void nvram_read(uint16_t offset, char *buf, unsigned int nbytes)
{
unsigned int i;
- for (i = 0; i < nbytes; i++)
- buf[i] = nvram_read_byte(offset + i);
-}
-
-static void nvram_write_byte(uint16_t offset, uint8_t val)
-{
- outb(offset & 0xff, NVRAM_ADDR_LO);
- outb(offset >> 8, NVRAM_ADDR_HI);
- outb(val, NVRAM_DATA);
+ for (i = 0; i < nbytes; i++) {
+ buf[i] = inb(NVRAM_BASE + offset + i);
+ }
}
static void nvram_write(uint16_t offset, const char *buf, unsigned int nbytes)
{
unsigned int i;
- for (i = 0; i < nbytes; i++)
- nvram_write_byte(offset + i, buf[i]);
+ for (i = 0; i < nbytes; i++) {
+ outb(buf[i], NVRAM_BASE + offset + i);
+ }
}
static uint8_t qemu_uuid[16];
--
1.7.1
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