[deliverable/linux.git] / arch / mips / bcm47xx / nvram.c

/*
 * BCM947xx nvram variable access
 *
 * Copyright (C) 2005 Broadcom Corporation
 * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
 * Copyright (C) 2010-2011 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/init.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/ssb/ssb.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <asm/addrspace.h>
#include <asm/mach-bcm47xx/nvram.h>
#include <asm/mach-bcm47xx/bcm47xx.h>

static char nvram_buf[NVRAM_SPACE];

static int nvram_find_and_copy(u32 base, u32 lim)
{
	struct nvram_header *header;
	int i;
	u32 off;
	u32 *src, *dst;

	/* TODO: when nvram is on nand flash check for bad blocks first. */
	off = FLASH_MIN;
	while (off <= lim) {
		/* Windowed flash access */
		header = (struct nvram_header *)
			KSEG1ADDR(base + off - NVRAM_SPACE);
		if (header->magic == NVRAM_HEADER)
			goto found;
		off <<= 1;
	}

	/* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
	header = (struct nvram_header *) KSEG1ADDR(base + 4096);
	if (header->magic == NVRAM_HEADER)
		goto found;

	header = (struct nvram_header *) KSEG1ADDR(base + 1024);
	if (header->magic == NVRAM_HEADER)
		goto found;

	return -ENXIO;

found:
	src = (u32 *) header;
	dst = (u32 *) nvram_buf;
	for (i = 0; i < sizeof(struct nvram_header); i += 4)
		*dst++ = *src++;
	for (; i < header->len && i < NVRAM_SPACE; i += 4)
		*dst++ = le32_to_cpu(*src++);

	return 0;
}

#ifdef CONFIG_BCM47XX_SSB
static int nvram_init_ssb(void)
{
	struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore;
	u32 base;
	u32 lim;

	if (mcore->pflash.present) {
		base = mcore->pflash.window;
		lim = mcore->pflash.window_size;
	} else {
		pr_err("Couldn't find supported flash memory\n");
		return -ENXIO;
	}

	return nvram_find_and_copy(base, lim);
}
#endif

#ifdef CONFIG_BCM47XX_BCMA
static int nvram_init_bcma(void)
{
	struct bcma_drv_cc *cc = &bcm47xx_bus.bcma.bus.drv_cc;
	u32 base;
	u32 lim;

#ifdef CONFIG_BCMA_NFLASH
	if (cc->nflash.boot) {
		base = BCMA_SOC_FLASH1;
		lim = BCMA_SOC_FLASH1_SZ;
	} else
#endif
	if (cc->pflash.present) {
		base = cc->pflash.window;
		lim = cc->pflash.window_size;
#ifdef CONFIG_BCMA_SFLASH
	} else if (cc->sflash.present) {
		base = cc->sflash.window;
		lim = cc->sflash.size;
#endif
	} else {
		pr_err("Couldn't find supported flash memory\n");
		return -ENXIO;
	}

	return nvram_find_and_copy(base, lim);
}
#endif

static int early_nvram_init(void)
{
	switch (bcm47xx_bus_type) {
#ifdef CONFIG_BCM47XX_SSB
	case BCM47XX_BUS_TYPE_SSB:
		return nvram_init_ssb();
#endif
#ifdef CONFIG_BCM47XX_BCMA
	case BCM47XX_BUS_TYPE_BCMA:
		return nvram_init_bcma();
#endif
	}
	return -ENXIO;
}

int nvram_getenv(char *name, char *val, size_t val_len)
{
	char *var, *value, *end, *eq;
	int err;

	if (!name)
		return -EINVAL;

	if (!nvram_buf[0]) {
		err = early_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] = end[1] = '\0';
	for (; *var; var = value + strlen(value) + 1) {
		eq = strchr(var, '=');
		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(nvram_getenv);
Commit	Line	Data
121915c4 WB	1	/*
	2	* BCM947xx nvram variable access
	3	*
	4	* Copyright (C) 2005 Broadcom Corporation
	5	* Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
fe6f3642	6	* Copyright (C) 2010-2011 Hauke Mehrtens <hauke@hauke-m.de>
121915c4 WB	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*/
	13
	14	#include <linux/init.h>
	15	#include <linux/types.h>
	16	#include <linux/module.h>
	17	#include <linux/ssb/ssb.h>
	18	#include <linux/kernel.h>
	19	#include <linux/string.h>
	20	#include <asm/addrspace.h>
	21	#include <asm/mach-bcm47xx/nvram.h>
	22	#include <asm/mach-bcm47xx/bcm47xx.h>
	23
	24	static char nvram_buf[NVRAM_SPACE];
	25
cc4403e0	26	static int nvram_find_and_copy(u32 base, u32 lim)
121915c4	27	{
121915c4 WB	28	struct nvram_header *header;
121915c4 WB	29	int i;
08ccf572	30	u32 off;
121915c4 WB	31	u32 src, dst;
121915c4 WB	32
c4485671	33	/* TODO: when nvram is on nand flash check for bad blocks first. */
121915c4 WB	34	off = FLASH_MIN;
	35	while (off <= lim) {
	36	/* Windowed flash access */
	37	header = (struct nvram_header *)
	38	KSEG1ADDR(base + off - NVRAM_SPACE);
	39	if (header->magic == NVRAM_HEADER)
	40	goto found;
	41	off <<= 1;
	42	}
	43
	44	/* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
	45	header = (struct nvram_header *) KSEG1ADDR(base + 4096);
	46	if (header->magic == NVRAM_HEADER)
	47	goto found;
	48
	49	header = (struct nvram_header *) KSEG1ADDR(base + 1024);
	50	if (header->magic == NVRAM_HEADER)
	51	goto found;
	52
cc4403e0	53	return -ENXIO;
121915c4 WB	54
	55	found:
	56	src = (u32 *) header;
	57	dst = (u32 *) nvram_buf;
	58	for (i = 0; i < sizeof(struct nvram_header); i += 4)
	59	dst++ = src++;
	60	for (; i < header->len && i < NVRAM_SPACE; i += 4)
	61	dst++ = le32_to_cpu(src++);
cc4403e0 HM	62
cc4403e0 HM	63	return 0;
121915c4 WB	64	}
121915c4 WB	65
bb765632	66	#ifdef CONFIG_BCM47XX_SSB
cc4403e0	67	static int nvram_init_ssb(void)
bb765632 RM	68	{
	69	struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore;
	70	u32 base;
	71	u32 lim;
	72
	73	if (mcore->pflash.present) {
	74	base = mcore->pflash.window;
	75	lim = mcore->pflash.window_size;
	76	} else {
	77	pr_err("Couldn't find supported flash memory\n");
cc4403e0	78	return -ENXIO;
bb765632 RM	79	}
bb765632 RM	80
cc4403e0	81	return nvram_find_and_copy(base, lim);
bb765632 RM	82	}
	83	#endif
	84
	85	#ifdef CONFIG_BCM47XX_BCMA
cc4403e0	86	static int nvram_init_bcma(void)
bb765632 RM	87	{
	88	struct bcma_drv_cc *cc = &bcm47xx_bus.bcma.bus.drv_cc;
	89	u32 base;
	90	u32 lim;
	91
c4485671 HM	92	#ifdef CONFIG_BCMA_NFLASH
	93	if (cc->nflash.boot) {
	94	base = BCMA_SOC_FLASH1;
	95	lim = BCMA_SOC_FLASH1_SZ;
	96	} else
	97	#endif
bb765632 RM	98	if (cc->pflash.present) {
	99	base = cc->pflash.window;
	100	lim = cc->pflash.window_size;
	101	#ifdef CONFIG_BCMA_SFLASH
	102	} else if (cc->sflash.present) {
	103	base = cc->sflash.window;
	104	lim = cc->sflash.size;
	105	#endif
	106	} else {
	107	pr_err("Couldn't find supported flash memory\n");
cc4403e0	108	return -ENXIO;
bb765632 RM	109	}
bb765632 RM	110
cc4403e0	111	return nvram_find_and_copy(base, lim);
bb765632 RM	112	}
	113	#endif
	114
cc4403e0	115	static int early_nvram_init(void)
bb765632 RM	116	{
	117	switch (bcm47xx_bus_type) {
	118	#ifdef CONFIG_BCM47XX_SSB
	119	case BCM47XX_BUS_TYPE_SSB:
cc4403e0	120	return nvram_init_ssb();
bb765632 RM	121	#endif
	122	#ifdef CONFIG_BCM47XX_BCMA
	123	case BCM47XX_BUS_TYPE_BCMA:
cc4403e0	124	return nvram_init_bcma();
bb765632 RM	125	#endif
bb765632 RM	126	}
cc4403e0	127	return -ENXIO;
bb765632 RM	128	}
bb765632 RM	129
121915c4 WB	130	int nvram_getenv(char name, char val, size_t val_len)
	131	{
	132	char var, value, end, eq;
cc4403e0	133	int err;
121915c4 WB	134
121915c4 WB	135	if (!name)
ee7e2f3c	136	return -EINVAL;
121915c4	137
cc4403e0 HM	138	if (!nvram_buf[0]) {
	139	err = early_nvram_init();
	140	if (err)
	141	return err;
	142	}
121915c4 WB	143
	144	/* Look for name=value and return value */
	145	var = &nvram_buf[sizeof(struct nvram_header)];
	146	end = nvram_buf + sizeof(nvram_buf) - 2;
	147	end[0] = end[1] = '\0';
	148	for (; *var; var = value + strlen(value) + 1) {
	149	eq = strchr(var, '=');
	150	if (!eq)
	151	break;
	152	value = eq + 1;
	153	if ((eq - var) == strlen(name) &&
	154	strncmp(var, name, (eq - var)) == 0) {
44d4b2ae	155	return snprintf(val, val_len, "%s", value);
121915c4 WB	156	}
121915c4 WB	157	}
ee7e2f3c	158	return -ENOENT;
121915c4 WB	159	}
121915c4 WB	160	EXPORT_SYMBOL(nvram_getenv);