2015-04-01 20:23:37 +00:00
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From 9d1d08646af4491aec41d40341930b9bfd62ffa9 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
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Date: Wed, 29 Oct 2014 10:05:06 +0100
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Subject: [PATCH] MIPS: BCM47XX: Use mtd as an alternative way/API to get NVRAM
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content
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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NVRAM can be read using magic memory offset, but after all it's just a
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flash partition. On platforms where NVRAM isn't needed early we can get
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it using mtd subsystem.
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
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Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
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Cc: linux-mips@linux-mips.org
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Patchwork: https://patchwork.linux-mips.org/patch/8266/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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---
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arch/mips/bcm47xx/nvram.c | 42 ++++++++++++++++++++++++++++++++++++++----
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1 file changed, 38 insertions(+), 4 deletions(-)
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--- a/arch/mips/bcm47xx/nvram.c
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+++ b/arch/mips/bcm47xx/nvram.c
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@@ -13,12 +13,10 @@
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#include <linux/types.h>
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#include <linux/module.h>
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-#include <linux/ssb/ssb.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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-#include <asm/addrspace.h>
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+#include <linux/mtd/mtd.h>
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#include <bcm47xx_nvram.h>
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-#include <asm/mach-bcm47xx/bcm47xx.h>
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static char nvram_buf[NVRAM_SPACE];
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static const u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000};
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2015-05-21 19:32:46 +00:00
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@@ -123,7 +121,43 @@ int bcm47xx_nvram_init_from_mem(u32 base
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2015-04-01 20:23:37 +00:00
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static int nvram_init(void)
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{
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- /* TODO: Look for MTD "nvram" partition */
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+#ifdef CONFIG_MTD
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+ struct mtd_info *mtd;
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+ struct nvram_header header;
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+ size_t bytes_read;
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+ int err, i;
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+
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+ mtd = get_mtd_device_nm("nvram");
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+ if (IS_ERR(mtd))
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+ return -ENODEV;
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+
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+ for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) {
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+ loff_t from = mtd->size - nvram_sizes[i];
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+
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+ if (from < 0)
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+ continue;
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+
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+ err = mtd_read(mtd, from, sizeof(header), &bytes_read,
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+ (uint8_t *)&header);
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+ if (!err && header.magic == NVRAM_HEADER) {
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+ u8 *dst = (uint8_t *)nvram_buf;
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+ size_t len = header.len;
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+
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+ if (header.len > NVRAM_SPACE) {
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+ pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
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+ header.len, NVRAM_SPACE);
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+ len = NVRAM_SPACE;
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+ }
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+
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+ err = mtd_read(mtd, from, len, &bytes_read, dst);
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+ if (err)
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+ return err;
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+ memset(dst + bytes_read, 0x0, NVRAM_SPACE - bytes_read);
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+
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+ return 0;
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+ }
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+ }
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+#endif
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return -ENXIO;
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}
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