diff options
Diffstat (limited to 'target/linux/brcm47xx/patches-3.18/030-06-MIPS-BCM47XX-Use-mtd-as-an-alternative-way-API-to-ge.patch')
| -rw-r--r-- | target/linux/brcm47xx/patches-3.18/030-06-MIPS-BCM47XX-Use-mtd-as-an-alternative-way-API-to-ge.patch | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-3.18/030-06-MIPS-BCM47XX-Use-mtd-as-an-alternative-way-API-to-ge.patch b/target/linux/brcm47xx/patches-3.18/030-06-MIPS-BCM47XX-Use-mtd-as-an-alternative-way-API-to-ge.patch new file mode 100644 index 0000000000..7f19d3ac65 --- /dev/null +++ b/target/linux/brcm47xx/patches-3.18/030-06-MIPS-BCM47XX-Use-mtd-as-an-alternative-way-API-to-ge.patch @@ -0,0 +1,88 @@ +From 9d1d08646af4491aec41d40341930b9bfd62ffa9 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com> +Date: Wed, 29 Oct 2014 10:05:06 +0100 +Subject: [PATCH] MIPS: BCM47XX: Use mtd as an alternative way/API to get NVRAM + content +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +NVRAM can be read using magic memory offset, but after all it's just a +flash partition. On platforms where NVRAM isn't needed early we can get +it using mtd subsystem. + +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/8266/ +Signed-off-by: Ralf Baechle <ralf@linux-mips.org> +--- + arch/mips/bcm47xx/nvram.c | 42 ++++++++++++++++++++++++++++++++++++++---- + 1 file changed, 38 insertions(+), 4 deletions(-) + +diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c +index 21712fb..8b64991 100644 +--- a/arch/mips/bcm47xx/nvram.c ++++ b/arch/mips/bcm47xx/nvram.c +@@ -13,12 +13,10 @@ + + #include <linux/types.h> + #include <linux/module.h> +-#include <linux/ssb/ssb.h> + #include <linux/kernel.h> + #include <linux/string.h> +-#include <asm/addrspace.h> ++#include <linux/mtd/mtd.h> + #include <bcm47xx_nvram.h> +-#include <asm/mach-bcm47xx/bcm47xx.h> + + static char nvram_buf[NVRAM_SPACE]; + static const u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000}; +@@ -123,7 +121,43 @@ int bcm47xx_nvram_init_from_mem(u32 base, u32 lim) + + static int nvram_init(void) + { +- /* TODO: Look for MTD "nvram" partition */ ++#ifdef CONFIG_MTD ++ struct mtd_info *mtd; ++ struct nvram_header header; ++ size_t bytes_read; ++ int err, i; ++ ++ 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]; ++ ++ if (from < 0) ++ continue; ++ ++ err = mtd_read(mtd, from, sizeof(header), &bytes_read, ++ (uint8_t *)&header); ++ if (!err && header.magic == NVRAM_HEADER) { ++ 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; ++ } ++ ++ err = mtd_read(mtd, from, len, &bytes_read, dst); ++ if (err) ++ return err; ++ memset(dst + bytes_read, 0x0, NVRAM_SPACE - bytes_read); ++ ++ return 0; ++ } ++ } ++#endif + + return -ENXIO; + } +-- +1.8.4.5 + |