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132 lines
4.0 KiB
Diff
132 lines
4.0 KiB
Diff
From f229d75f1472c4cd30f464e4a0f94f410046bd80 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: Sat, 6 Jun 2015 23:16:23 +0200
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Subject: [PATCH] MIPS: BCM47xx: Add helper variable for storing NVRAM length
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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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This simplifies code just a bit (also maybe makes it a bit more
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intuitive?) and will allow us to stop storing header. Right now we copy
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whole NVRAM including its header to the internal buffer. It is not
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needed to store a header as we don't access all these details like CRC,
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flags, etc. The next improvement that should follow is copying only the
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real contents.
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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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Cc: Arend van Spriel <arend@broadcom.com>
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Cc: Hante Meuleman <meuleman@broadcom.com>
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Patchwork: https://patchwork.linux-mips.org/patch/10535/
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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 | 37 ++++++++++++++++---------------------
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1 file changed, 16 insertions(+), 21 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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@@ -35,6 +35,7 @@ struct nvram_header {
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};
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static char nvram_buf[NVRAM_SPACE];
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+static size_t nvram_len;
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static const u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000};
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static u32 find_nvram_size(void __iomem *end)
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@@ -60,7 +61,7 @@ static int nvram_find_and_copy(void __io
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u32 *src, *dst;
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u32 size;
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- if (nvram_buf[0]) {
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+ if (nvram_len) {
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pr_warn("nvram already initialized\n");
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return -EEXIST;
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}
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@@ -99,17 +100,18 @@ found:
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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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header = (struct nvram_header *)nvram_buf;
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- if (header->len > size) {
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+ nvram_len = header->len;
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+ if (nvram_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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+ nvram_len = size;
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}
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- if (header->len >= NVRAM_SPACE) {
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+ if (nvram_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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+ nvram_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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+ for (; i < nvram_len; i += 4)
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*dst++ = readl(src++);
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nvram_buf[NVRAM_SPACE - 1] = '\0';
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@@ -144,7 +146,6 @@ 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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@@ -155,20 +156,16 @@ static int nvram_init(void)
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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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header.len > sizeof(header)) {
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- if (header.len >= NVRAM_SPACE) {
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+ nvram_len = header.len;
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+ if (nvram_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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- header.len = NVRAM_SPACE - 1;
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+ nvram_len = NVRAM_SPACE - 1;
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}
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- err = mtd_read(mtd, 0, header.len, &bytes_read,
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+ err = mtd_read(mtd, 0, nvram_len, &nvram_len,
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(u8 *)nvram_buf);
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- if (err)
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- return err;
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-
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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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+ return err;
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}
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#endif
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@@ -183,7 +180,7 @@ int bcm47xx_nvram_getenv(const char *nam
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if (!name)
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return -EINVAL;
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- if (!nvram_buf[0]) {
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+ if (!nvram_len) {
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err = nvram_init();
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if (err)
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return err;
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@@ -231,16 +228,14 @@ char *bcm47xx_nvram_get_contents(size_t
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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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- if (!nvram_buf[0]) {
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+ if (!nvram_len) {
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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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- header = (struct nvram_header *)nvram_buf;
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- *nvram_size = header->len - sizeof(struct nvram_header);
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+ *nvram_size = nvram_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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