mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e58da16f71
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Patchwork: http://patchwork.linux-mips.org/patch/4742/ Signed-off-by: John Crispin <blogic@openwrt.org>
161 lines
3.5 KiB
C
161 lines
3.5 KiB
C
/*
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* BCM947xx nvram variable access
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*
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* Copyright (C) 2005 Broadcom Corporation
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* Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2010-2011 Hauke Mehrtens <hauke@hauke-m.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/init.h>
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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 <asm/mach-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 int nvram_find_and_copy(u32 base, u32 lim)
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{
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struct nvram_header *header;
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int i;
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u32 off;
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u32 *src, *dst;
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/* TODO: when nvram is on nand flash check for bad blocks first. */
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off = FLASH_MIN;
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while (off <= lim) {
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/* Windowed flash access */
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header = (struct nvram_header *)
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KSEG1ADDR(base + off - NVRAM_SPACE);
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if (header->magic == NVRAM_HEADER)
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goto found;
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off <<= 1;
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}
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/* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
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header = (struct nvram_header *) KSEG1ADDR(base + 4096);
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if (header->magic == NVRAM_HEADER)
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goto found;
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header = (struct nvram_header *) KSEG1ADDR(base + 1024);
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if (header->magic == NVRAM_HEADER)
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goto found;
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return -ENXIO;
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found:
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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++ = *src++;
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for (; i < header->len && i < NVRAM_SPACE; i += 4)
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*dst++ = le32_to_cpu(*src++);
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return 0;
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}
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#ifdef CONFIG_BCM47XX_SSB
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static int nvram_init_ssb(void)
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{
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struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore;
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u32 base;
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u32 lim;
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if (mcore->pflash.present) {
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base = mcore->pflash.window;
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lim = mcore->pflash.window_size;
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} else {
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pr_err("Couldn't find supported flash memory\n");
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return -ENXIO;
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}
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return nvram_find_and_copy(base, lim);
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}
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#endif
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#ifdef CONFIG_BCM47XX_BCMA
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static int nvram_init_bcma(void)
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{
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struct bcma_drv_cc *cc = &bcm47xx_bus.bcma.bus.drv_cc;
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u32 base;
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u32 lim;
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#ifdef CONFIG_BCMA_NFLASH
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if (cc->nflash.boot) {
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base = BCMA_SOC_FLASH1;
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lim = BCMA_SOC_FLASH1_SZ;
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} else
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#endif
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if (cc->pflash.present) {
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base = cc->pflash.window;
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lim = cc->pflash.window_size;
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#ifdef CONFIG_BCMA_SFLASH
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} else if (cc->sflash.present) {
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base = cc->sflash.window;
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lim = cc->sflash.size;
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#endif
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} else {
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pr_err("Couldn't find supported flash memory\n");
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return -ENXIO;
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}
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return nvram_find_and_copy(base, lim);
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}
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#endif
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static int nvram_init(void)
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{
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switch (bcm47xx_bus_type) {
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#ifdef CONFIG_BCM47XX_SSB
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case BCM47XX_BUS_TYPE_SSB:
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return nvram_init_ssb();
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#endif
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#ifdef CONFIG_BCM47XX_BCMA
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case BCM47XX_BUS_TYPE_BCMA:
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return nvram_init_bcma();
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#endif
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}
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return -ENXIO;
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}
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int nvram_getenv(char *name, char *val, size_t val_len)
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{
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char *var, *value, *end, *eq;
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int err;
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if (!name)
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return -EINVAL;
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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 err;
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}
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/* Look for name=value and return value */
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var = &nvram_buf[sizeof(struct nvram_header)];
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end = nvram_buf + sizeof(nvram_buf) - 2;
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end[0] = end[1] = '\0';
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for (; *var; var = value + strlen(value) + 1) {
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eq = strchr(var, '=');
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if (!eq)
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break;
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value = eq + 1;
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if ((eq - var) == strlen(name) &&
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strncmp(var, name, (eq - var)) == 0) {
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return snprintf(val, val_len, "%s", value);
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}
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}
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return -ENOENT;
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}
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EXPORT_SYMBOL(nvram_getenv);
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