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authorRafał Miłecki <zajec5@gmail.com>2014-09-03 22:59:45 +0200
committerRalf Baechle <ralf@linux-mips.org>2014-11-24 07:44:59 +0100
commit21400f252a97755579b43a4dc95dd02cd7f0ca75 (patch)
tree54b4dad7d552e2f2840ca5f8c0ec88ee9747368d
parent8d602dd0f984e8488ab891344ebdb6e1f3128c4a (diff)
downloadlinux-21400f252a97755579b43a4dc95dd02cd7f0ca75.tar.bz2
MIPS: BCM47XX: Make ssb init NVRAM instead of bcm47xx polling it
This makes NVRAM code less bcm47xx/ssb specific allowing it to become a standalone driver in the future. A similar patch for bcma will follow when it's ready. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Acked-by: Hauke Mehrtens <hauke@hauke-m.de> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7612/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/bcm47xx/nvram.c30
-rw-r--r--arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h1
-rw-r--r--drivers/ssb/driver_mipscore.c14
3 files changed, 23 insertions, 22 deletions
diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c
index e07976bbb739..fecc5aeddd46 100644
--- a/arch/mips/bcm47xx/nvram.c
+++ b/arch/mips/bcm47xx/nvram.c
@@ -98,7 +98,14 @@ found:
return 0;
}
-static int bcm47xx_nvram_init_from_mem(u32 base, u32 lim)
+/*
+ * On bcm47xx we need access to the NVRAM very early, so we can't use mtd
+ * subsystem to access flash. We can't even use platform device / driver to
+ * store memory offset.
+ * To handle this we provide following symbol. It's supposed to be called as
+ * soon as we get info about flash device, before any NVRAM entry is needed.
+ */
+int bcm47xx_nvram_init_from_mem(u32 base, u32 lim)
{
void __iomem *iobase;
int err;
@@ -114,25 +121,6 @@ static int bcm47xx_nvram_init_from_mem(u32 base, u32 lim)
return err;
}
-#ifdef CONFIG_BCM47XX_SSB
-static int nvram_init_ssb(void)
-{
- struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore;
- u32 base;
- u32 lim;
-
- if (mcore->pflash.present) {
- base = mcore->pflash.window;
- lim = mcore->pflash.window_size;
- } else {
- pr_err("Couldn't find supported flash memory\n");
- return -ENXIO;
- }
-
- return bcm47xx_nvram_init_from_mem(base, lim);
-}
-#endif
-
#ifdef CONFIG_BCM47XX_BCMA
static int nvram_init_bcma(void)
{
@@ -168,7 +156,7 @@ static int nvram_init(void)
switch (bcm47xx_bus_type) {
#ifdef CONFIG_BCM47XX_SSB
case BCM47XX_BUS_TYPE_SSB:
- return nvram_init_ssb();
+ break;
#endif
#ifdef CONFIG_BCM47XX_BCMA
case BCM47XX_BUS_TYPE_BCMA:
diff --git a/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h b/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h
index 36a3fc1aa3ae..676be22bcab3 100644
--- a/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h
+++ b/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h
@@ -32,6 +32,7 @@ struct nvram_header {
#define NVRAM_MAX_VALUE_LEN 255
#define NVRAM_MAX_PARAM_LEN 64
+int bcm47xx_nvram_init_from_mem(u32 base, u32 lim);
extern int bcm47xx_nvram_getenv(char *name, char *val, size_t val_len);
static inline void bcm47xx_nvram_parse_macaddr(char *buf, u8 macaddr[6])
diff --git a/drivers/ssb/driver_mipscore.c b/drivers/ssb/driver_mipscore.c
index 09077067b0c8..7b986f9f213f 100644
--- a/drivers/ssb/driver_mipscore.c
+++ b/drivers/ssb/driver_mipscore.c
@@ -15,6 +15,9 @@
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/time.h>
+#ifdef CONFIG_BCM47XX
+#include <bcm47xx_nvram.h>
+#endif
#include "ssb_private.h"
@@ -210,6 +213,7 @@ static void ssb_mips_serial_init(struct ssb_mipscore *mcore)
static void ssb_mips_flash_detect(struct ssb_mipscore *mcore)
{
struct ssb_bus *bus = mcore->dev->bus;
+ struct ssb_sflash *sflash = &mcore->sflash;
struct ssb_pflash *pflash = &mcore->pflash;
/* When there is no chipcommon on the bus there is 4MB flash */
@@ -242,7 +246,15 @@ static void ssb_mips_flash_detect(struct ssb_mipscore *mcore)
}
ssb_pflash:
- if (pflash->present) {
+ if (sflash->present) {
+#ifdef CONFIG_BCM47XX
+ bcm47xx_nvram_init_from_mem(sflash->window, sflash->size);
+#endif
+ } else if (pflash->present) {
+#ifdef CONFIG_BCM47XX
+ bcm47xx_nvram_init_from_mem(pflash->window, pflash->window_size);
+#endif
+
ssb_pflash_data.width = pflash->buswidth;
ssb_pflash_resource.start = pflash->window;
ssb_pflash_resource.end = pflash->window + pflash->window_size;