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Diffstat (limited to 'arch/mips/bcm47xx/nvram.c')
-rw-r--r--arch/mips/bcm47xx/nvram.c77
1 files changed, 36 insertions, 41 deletions
diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c
index c5c381c..ba632ff 100644
--- a/arch/mips/bcm47xx/nvram.c
+++ b/arch/mips/bcm47xx/nvram.c
@@ -11,15 +11,18 @@
* option) any later version.
*/
+#include <linux/io.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mtd/mtd.h>
-#include <bcm47xx_nvram.h>
+#include <linux/bcm47xx_nvram.h>
-#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */
-#define NVRAM_SPACE 0x8000
+#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */
+#define NVRAM_SPACE 0x10000
+#define NVRAM_MAX_GPIO_ENTRIES 32
+#define NVRAM_MAX_GPIO_VALUE_LEN 30
#define FLASH_MIN 0x00020000 /* Minimum flash size */
@@ -91,20 +94,18 @@ static int nvram_find_and_copy(void __iomem *iobase, u32 lim)
return -ENXIO;
found:
-
if (header->len > size)
pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n");
if (header->len > NVRAM_SPACE)
pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
header->len, NVRAM_SPACE);
- src = (u32 *) header;
- dst = (u32 *) nvram_buf;
+ src = (u32 *)header;
+ dst = (u32 *)nvram_buf;
for (i = 0; i < sizeof(struct nvram_header); i += 4)
- *dst++ = *src++;
+ *dst++ = __raw_readl(src++);
for (; i < header->len && i < NVRAM_SPACE && i < size; i += 4)
- *dst++ = le32_to_cpu(*src++);
- memset(dst, 0x0, NVRAM_SPACE - i);
+ *dst++ = readl(src++);
return 0;
}
@@ -138,37 +139,28 @@ static int nvram_init(void)
struct mtd_info *mtd;
struct nvram_header header;
size_t bytes_read;
- int err, i;
+ int err;
mtd = get_mtd_device_nm("nvram");
if (IS_ERR(mtd))
return -ENODEV;
- for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) {
- loff_t from = mtd->size - nvram_sizes[i];
+ err = mtd_read(mtd, 0, sizeof(header), &bytes_read, (uint8_t *)&header);
+ if (!err && header.magic == NVRAM_MAGIC) {
+ u8 *dst = (uint8_t *)nvram_buf;
+ size_t len = header.len;
- if (from < 0)
- continue;
-
- err = mtd_read(mtd, from, sizeof(header), &bytes_read,
- (uint8_t *)&header);
- if (!err && header.magic == NVRAM_MAGIC) {
- u8 *dst = (uint8_t *)nvram_buf;
- size_t len = header.len;
-
- if (header.len > NVRAM_SPACE) {
- pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
- header.len, NVRAM_SPACE);
- len = NVRAM_SPACE;
- }
+ if (header.len > NVRAM_SPACE) {
+ pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
+ header.len, NVRAM_SPACE);
+ len = NVRAM_SPACE;
+ }
- err = mtd_read(mtd, from, len, &bytes_read, dst);
- if (err)
- return err;
- memset(dst + bytes_read, 0x0, NVRAM_SPACE - bytes_read);
+ err = mtd_read(mtd, 0, len, &bytes_read, dst);
+ if (err)
+ return err;
- return 0;
- }
+ return 0;
}
#endif
@@ -178,7 +170,7 @@ static int nvram_init(void)
int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len)
{
char *var, *value, *end, *eq;
- int err;
+ int data_left, err;
if (!name)
return -EINVAL;
@@ -192,16 +184,18 @@ int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len)
/* Look for name=value and return value */
var = &nvram_buf[sizeof(struct nvram_header)];
end = nvram_buf + sizeof(nvram_buf) - 2;
- end[0] = end[1] = '\0';
+ end[0] = '\0';
+ end[1] = '\0';
for (; *var; var = value + strlen(value) + 1) {
- eq = strchr(var, '=');
+ data_left = end - var;
+
+ eq = strnchr(var, data_left, '=');
if (!eq)
break;
value = eq + 1;
- if ((eq - var) == strlen(name) &&
- strncmp(var, name, (eq - var)) == 0) {
+ if (eq - var == strlen(name) &&
+ strncmp(var, name, eq - var) == 0)
return snprintf(val, val_len, "%s", value);
- }
}
return -ENOENT;
}
@@ -210,10 +204,11 @@ EXPORT_SYMBOL(bcm47xx_nvram_getenv);
int bcm47xx_nvram_gpio_pin(const char *name)
{
int i, err;
- char nvram_var[10];
- char buf[30];
+ char nvram_var[] = "gpioXX";
+ char buf[NVRAM_MAX_GPIO_VALUE_LEN];
- for (i = 0; i < 32; i++) {
+ /* TODO: Optimize it to don't call getenv so many times */
+ for (i = 0; i < NVRAM_MAX_GPIO_ENTRIES; i++) {
err = snprintf(nvram_var, sizeof(nvram_var), "gpio%i", i);
if (err <= 0)
continue;
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