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165 lines
5.1 KiB
Diff
165 lines
5.1 KiB
Diff
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From 2536295c2aeafc769215a6b2883126fa94c90b9a Mon Sep 17 00:00:00 2001
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From: Hante Meuleman <meuleman@broadcom.com>
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Date: Thu, 21 May 2015 15:27:23 +0200
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Subject: [PATCH] mips: bcm47xx: allow retrieval of complete nvram contents
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Host platforms such as routers supported by OpenWrt can
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support NVRAM reading directly from internal NVRAM store.
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The brcmfmac for one requires the complete nvram contents
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to select what needs to be sent to wireless device.
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Signed-off-by: Arend van Spriel <arend@broadcom.com>
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Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
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Reviewed-by: Arend Van Spriel <arend@broadcom.com>
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Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
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Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
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Reviewed-by: Daniel (Deognyoun) Kim <dekim@broadcom.com>
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Cc: linux-mips@linux-mips.org
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Patchwork: https://patchwork.linux-mips.org/patch/10093/
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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 | 60 ++++++++++++++++++++++++++++++++-----------
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include/linux/bcm47xx_nvram.h | 15 +++++++++++
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2 files changed, 60 insertions(+), 15 deletions(-)
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diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c
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index 95d028c..2ed762e 100644
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--- a/arch/mips/bcm47xx/nvram.c
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+++ b/arch/mips/bcm47xx/nvram.c
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@@ -94,17 +94,22 @@ static int nvram_find_and_copy(void __iomem *iobase, u32 lim)
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return -ENXIO;
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found:
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- if (header->len > size)
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- pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n");
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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 - 1);
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-
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src = (u32 *)header;
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dst = (u32 *)nvram_buf;
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for (i = 0; i < sizeof(struct nvram_header); i += 4)
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*dst++ = __raw_readl(src++);
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- for (; i < header->len && i < NVRAM_SPACE && i < size; i += 4)
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+ header = (struct nvram_header *)nvram_buf;
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+ if (header->len > size) {
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+ pr_err("The nvram size according to the header seems to be bigger than the partition on flash\n");
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+ header->len = size;
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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 - 1);
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+ header->len = NVRAM_SPACE - 1;
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+ }
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+ /* proceed reading data after header */
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+ for (; i < header->len; i += 4)
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*dst++ = readl(src++);
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nvram_buf[NVRAM_SPACE - 1] = '\0';
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@@ -139,6 +144,7 @@ static int nvram_init(void)
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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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+ struct nvram_header *pheader;
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size_t bytes_read;
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int err;
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@@ -147,20 +153,21 @@ static int nvram_init(void)
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return -ENODEV;
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err = mtd_read(mtd, 0, sizeof(header), &bytes_read, (uint8_t *)&header);
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- if (!err && header.magic == NVRAM_MAGIC) {
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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 (len >= NVRAM_SPACE) {
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- len = NVRAM_SPACE - 1;
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+ if (!err && header.magic == NVRAM_MAGIC &&
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+ header.len > sizeof(header)) {
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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, len);
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+ header.len, NVRAM_SPACE);
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+ header.len = NVRAM_SPACE - 1;
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}
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- err = mtd_read(mtd, 0, len, &bytes_read, dst);
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+ err = mtd_read(mtd, 0, header.len, &bytes_read,
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+ (u8 *)nvram_buf);
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if (err)
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return err;
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+ pheader = (struct nvram_header *)nvram_buf;
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+ pheader->len = header.len;
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return 0;
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}
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#endif
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@@ -219,3 +226,26 @@ int bcm47xx_nvram_gpio_pin(const char *name)
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return -ENOENT;
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}
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EXPORT_SYMBOL(bcm47xx_nvram_gpio_pin);
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+
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+char *bcm47xx_nvram_get_contents(size_t *nvram_size)
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+{
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+ int err;
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+ char *nvram;
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+ struct nvram_header *header;
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+
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+ if (!nvram_buf[0]) {
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+ err = nvram_init();
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+ if (err)
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+ return NULL;
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+ }
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+
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+ header = (struct nvram_header *)nvram_buf;
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+ *nvram_size = header->len - sizeof(struct nvram_header);
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+ nvram = vmalloc(*nvram_size);
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+ if (!nvram)
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+ return NULL;
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+ memcpy(nvram, &nvram_buf[sizeof(struct nvram_header)], *nvram_size);
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+
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+ return nvram;
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+}
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+EXPORT_SYMBOL(bcm47xx_nvram_get_contents);
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diff --git a/include/linux/bcm47xx_nvram.h b/include/linux/bcm47xx_nvram.h
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index b12b07e..c73927c 100644
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--- a/include/linux/bcm47xx_nvram.h
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+++ b/include/linux/bcm47xx_nvram.h
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@@ -10,11 +10,17 @@
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#include <linux/types.h>
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#include <linux/kernel.h>
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+#include <linux/vmalloc.h>
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#ifdef CONFIG_BCM47XX
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int bcm47xx_nvram_init_from_mem(u32 base, u32 lim);
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int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len);
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int bcm47xx_nvram_gpio_pin(const char *name);
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+char *bcm47xx_nvram_get_contents(size_t *val_len);
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+static inline void bcm47xx_nvram_release_contents(char *nvram)
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+{
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+ vfree(nvram);
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+};
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#else
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static inline int bcm47xx_nvram_init_from_mem(u32 base, u32 lim)
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{
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@@ -29,6 +35,15 @@ static inline int bcm47xx_nvram_gpio_pin(const char *name)
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{
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return -ENOTSUPP;
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};
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+
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+static inline char *bcm47xx_nvram_get_contents(size_t *val_len)
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+{
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+ return NULL;
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+};
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+
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+static inline void bcm47xx_nvram_release_contents(char *nvram)
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+{
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+};
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#endif
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#endif /* __BCM47XX_NVRAM_H */
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--
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1.8.4.5
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