+++ /dev/null
-/*
- * BCM947xx nvram variable access
- *
- * Copyright (C) 2005 Broadcom Corporation
- * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * 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 <linux/bcm47xx_nvram.h>
-
-#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 */
-
-struct nvram_header {
- u32 magic;
- u32 len;
- u32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
- u32 config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */
- u32 config_ncdl; /* ncdl values for memc */
-};
-
-static char nvram_buf[NVRAM_SPACE];
-static const u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000};
-
-static u32 find_nvram_size(void __iomem *end)
-{
- struct nvram_header __iomem *header;
- int i;
-
- for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) {
- header = (struct nvram_header *)(end - nvram_sizes[i]);
- if (header->magic == NVRAM_MAGIC)
- return nvram_sizes[i];
- }
-
- return 0;
-}
-
-/* Probe for NVRAM header */
-static int nvram_find_and_copy(void __iomem *iobase, u32 lim)
-{
- struct nvram_header __iomem *header;
- int i;
- u32 off;
- u32 *src, *dst;
- u32 size;
-
- if (nvram_buf[0]) {
- pr_warn("nvram already initialized\n");
- return -EEXIST;
- }
-
- /* TODO: when nvram is on nand flash check for bad blocks first. */
- off = FLASH_MIN;
- while (off <= lim) {
- /* Windowed flash access */
- size = find_nvram_size(iobase + off);
- if (size) {
- header = (struct nvram_header *)(iobase + off - size);
- goto found;
- }
- off <<= 1;
- }
-
- /* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
- header = (struct nvram_header *)(iobase + 4096);
- if (header->magic == NVRAM_MAGIC) {
- size = NVRAM_SPACE;
- goto found;
- }
-
- header = (struct nvram_header *)(iobase + 1024);
- if (header->magic == NVRAM_MAGIC) {
- size = NVRAM_SPACE;
- goto found;
- }
-
- pr_err("no nvram found\n");
- 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;
- for (i = 0; i < sizeof(struct nvram_header); i += 4)
- *dst++ = __raw_readl(src++);
- for (; i < header->len && i < NVRAM_SPACE && i < size; i += 4)
- *dst++ = readl(src++);
-
- return 0;
-}
-
-/*
- * On bcm47xx we need access to the NVRAM very early, so we can't use mtd
- * subsystem to access flash. We can't even use platform device / driver to
- * store memory offset.
- * To handle this we provide following symbol. It's supposed to be called as
- * soon as we get info about flash device, before any NVRAM entry is needed.
- */
-int bcm47xx_nvram_init_from_mem(u32 base, u32 lim)
-{
- void __iomem *iobase;
- int err;
-
- iobase = ioremap_nocache(base, lim);
- if (!iobase)
- return -ENOMEM;
-
- err = nvram_find_and_copy(iobase, lim);
-
- iounmap(iobase);
-
- return err;
-}
-
-static int nvram_init(void)
-{
-#ifdef CONFIG_MTD
- struct mtd_info *mtd;
- struct nvram_header header;
- size_t bytes_read;
- int err;
-
- mtd = get_mtd_device_nm("nvram");
- if (IS_ERR(mtd))
- return -ENODEV;
-
- 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 (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, 0, len, &bytes_read, dst);
- if (err)
- return err;
-
- return 0;
- }
-#endif
-
- return -ENXIO;
-}
-
-int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len)
-{
- char *var, *value, *end, *eq;
- int data_left, err;
-
- if (!name)
- return -EINVAL;
-
- if (!nvram_buf[0]) {
- err = nvram_init();
- if (err)
- return err;
- }
-
- /* Look for name=value and return value */
- var = &nvram_buf[sizeof(struct nvram_header)];
- end = nvram_buf + sizeof(nvram_buf) - 2;
- end[0] = '\0';
- end[1] = '\0';
- for (; *var; var = value + strlen(value) + 1) {
- 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)
- return snprintf(val, val_len, "%s", value);
- }
- return -ENOENT;
-}
-EXPORT_SYMBOL(bcm47xx_nvram_getenv);
-
-int bcm47xx_nvram_gpio_pin(const char *name)
-{
- int i, err;
- char nvram_var[] = "gpioXX";
- char buf[NVRAM_MAX_GPIO_VALUE_LEN];
-
- /* 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;
- err = bcm47xx_nvram_getenv(nvram_var, buf, sizeof(buf));
- if (err <= 0)
- continue;
- if (!strcmp(name, buf))
- return i;
- }
- return -ENOENT;
-}
-EXPORT_SYMBOL(bcm47xx_nvram_gpio_pin);
Code Review / kvmfornfv.git / blobdiff