brcm-2.4: rip out all /dev/nvram and nvram setting/committing code from the kernel

SVN-Revision: 15440

4 files changed, 153 insertions, 982 deletions

diff --git a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/Makefile b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/Makefile
index f2096137e4..e08cf9acb4 100644
--- a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/Makefile
+++ b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/Makefile
@@ -9,7 +9,7 @@ O_TARGET        := bcm947xx.o
 
 export-objs     := export.o
 obj-y		:= prom.o setup.o time.o sbmips.o gpio.o
-obj-y		+= nvram.o nvram_linux.o cfe_env.o hndpmu.o
+obj-y		+= nvram.o cfe_env.o hndpmu.o
 obj-y		+= sbutils.o utils.o bcmsrom.o hndchipc.o
 obj-$(CONFIG_PCI) += sbpci.o pcibios.o
 obj-y 		+= export.o
diff --git a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/export.c b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/export.c
index ff3e031978..35a578aa67 100644
--- a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/export.c
+++ b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/export.c
@@ -69,9 +69,6 @@ _export(getintvar)
 
 _export(nvram_get)
 _export(nvram_getall)
-_export(nvram_set)
-_export(nvram_unset)
-_export(nvram_commit)
 
 _export(srom_read)
 _export(srom_write)
diff --git a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/nvram.c b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/nvram.c
index c37023bce7..e93752a373 100644
--- a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/nvram.c
+++ b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/nvram.c
@@ -1,7 +1,7 @@
 /*
- * NVRAM variable manipulation (common)
+ * NVRAM variable manipulation (Linux kernel half)
  *
- * Copyright 2004, Broadcom Corporation
+ * Copyright 2006, Broadcom Corporation
  * All Rights Reserved.
  * 
  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
@@ -11,306 +11,203 @@
  *
  */
 
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/bootmem.h>
+#include <linux/wrapper.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/mtd/mtd.h>
+#include <asm/addrspace.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
 #include <typedefs.h>
 #include <osl.h>
 #include <bcmendian.h>
 #include <bcmnvram.h>
-#include <sbsdram.h>
-
-extern struct nvram_tuple * BCMINIT(_nvram_realloc)(struct nvram_tuple *t, const char *name, const char *value);
-extern void BCMINIT(_nvram_free)(struct nvram_tuple *t);
-extern int BCMINIT(_nvram_read)(void *buf);
-
-char * BCMINIT(_nvram_get)(const char *name);
-int BCMINIT(_nvram_set)(const char *name, const char *value);
-int BCMINIT(_nvram_unset)(const char *name);
-int BCMINIT(_nvram_getall)(char *buf, int count);
-int BCMINIT(_nvram_commit)(struct nvram_header *header);
-int BCMINIT(_nvram_init)(void);
-void BCMINIT(_nvram_exit)(void);
-
-static struct nvram_tuple * BCMINITDATA(nvram_hash)[257];
-static struct nvram_tuple * nvram_dead;
-
-/* Free all tuples. Should be locked. */
-static void  
-BCMINITFN(nvram_free)(void)
-{
-	uint i;
-	struct nvram_tuple *t, *next;
-
-	/* Free hash table */
-	for (i = 0; i < ARRAYSIZE(BCMINIT(nvram_hash)); i++) {
-		for (t = BCMINIT(nvram_hash)[i]; t; t = next) {
-			next = t->next;
-			BCMINIT(_nvram_free)(t);
-		}
-		BCMINIT(nvram_hash)[i] = NULL;
-	}
+#include <sbconfig.h>
+#include <sbchipc.h>
+#include <sbutils.h>
+#include <hndmips.h>
+#include <sflash.h>
 
-	/* Free dead table */
-	for (t = nvram_dead; t; t = next) {
-		next = t->next;
-		BCMINIT(_nvram_free)(t);
-	}
-	nvram_dead = NULL;
+/* In BSS to minimize text size and page aligned so it can be mmap()-ed */
+static char nvram_buf[NVRAM_SPACE] __attribute__((aligned(PAGE_SIZE)));
 
-	/* Indicate to per-port code that all tuples have been freed */
-	BCMINIT(_nvram_free)(NULL);
-}
+/* Global SB handle */
+extern void *bcm947xx_sbh;
+extern spinlock_t bcm947xx_sbh_lock;
 
-/* String hash */
-static INLINE uint
-hash(const char *s)
-{
-	uint hash = 0;
-
-	while (*s)
-		hash = 31 * hash + *s++;
+static int cfe_env;
+extern char *cfe_env_get(char *nv_buf, const char *name);
 
-	return hash;
-}
+/* Convenience */
+#define sbh bcm947xx_sbh
+#define sbh_lock bcm947xx_sbh_lock
 
-/* (Re)initialize the hash table. Should be locked. */
-static int 
-BCMINITFN(nvram_rehash)(struct nvram_header *header)
+/* Probe for NVRAM header */
+static void __init
+early_nvram_init(void)
 {
-	char buf[] = "0xXXXXXXXX", *name, *value, *end, *eq;
-
-	/* (Re)initialize hash table */
-	BCMINIT(nvram_free)();
+	struct nvram_header *header;
+	chipcregs_t *cc;
+	struct sflash *info = NULL;
+	int i;
+	uint32 base, off, lim;
+	u32 *src, *dst;
+
+	if ((cc = sb_setcore(sbh, SB_CC, 0)) != NULL) {
+		base = KSEG1ADDR(SB_FLASH2);
+		switch (readl(&cc->capabilities) & CC_CAP_FLASH_MASK) {
+		case PFLASH:
+			lim = SB_FLASH2_SZ;
+			break;
 
-	/* Parse and set "name=value\0 ... \0\0" */
-	name = (char *) &header[1];
-	end = (char *) header + NVRAM_SPACE - 2;
-	end[0] = end[1] = '\0';
-	for (; *name; name = value + strlen(value) + 1) {
-		if (!(eq = strchr(name, '=')))
+		case SFLASH_ST:
+		case SFLASH_AT:
+			if ((info = sflash_init(sbh,cc)) == NULL)
+				return;
+			lim = info->size;
 			break;
-		*eq = '\0';
-		value = eq + 1;
-		BCMINIT(_nvram_set)(name, value);
-		*eq = '=';
-	}
 
-	/* Set special SDRAM parameters */
-	if (!BCMINIT(_nvram_get)("sdram_init")) {
-		sprintf(buf, "0x%04X", (uint16)(header->crc_ver_init >> 16));
-		BCMINIT(_nvram_set)("sdram_init", buf);
-	}
-	if (!BCMINIT(_nvram_get)("sdram_config")) {
-		sprintf(buf, "0x%04X", (uint16)(header->config_refresh & 0xffff));
-		BCMINIT(_nvram_set)("sdram_config", buf);
-	}
-	if (!BCMINIT(_nvram_get)("sdram_refresh")) {
-		sprintf(buf, "0x%04X", (uint16)((header->config_refresh >> 16) & 0xffff));
-		BCMINIT(_nvram_set)("sdram_refresh", buf);
-	}
-	if (!BCMINIT(_nvram_get)("sdram_ncdl")) {
-		sprintf(buf, "0x%08X", header->config_ncdl);
-		BCMINIT(_nvram_set)("sdram_ncdl", buf);
+		case FLASH_NONE:
+		default:
+			return;
+		}
+	} else {
+		/* extif assumed, Stop at 4 MB */
+		base = KSEG1ADDR(SB_FLASH1);
+		lim = SB_FLASH1_SZ;
 	}
 
-	return 0;
-}
-
-/* Get the value of an NVRAM variable. Should be locked. */
-char * 
-BCMINITFN(_nvram_get)(const char *name)
-{
-	uint i;
-	struct nvram_tuple *t;
-	char *value;
-
-	if (!name)
-		return NULL;
-
-	/* Hash the name */
-	i = hash(name) % ARRAYSIZE(BCMINIT(nvram_hash));
-
-	/* Find the associated tuple in the hash table */
-	for (t = BCMINIT(nvram_hash)[i]; t && strcmp(t->name, name); t = t->next);
-
-	value = t ? t->value : NULL;
+	/* XXX: hack for supporting the CFE environment stuff on WGT634U */
+	src = (u32 *) KSEG1ADDR(base + 8 * 1024 * 1024 - 0x2000);
+	dst = (u32 *) nvram_buf;
+	if ((lim == 0x02000000) && ((*src & 0xff00ff) == 0x000001)) {
+		printk("early_nvram_init: WGT634U NVRAM found.\n");
 
-	return value;
-}
-
-/* Get the value of an NVRAM variable. Should be locked. */
-int 
-BCMINITFN(_nvram_set)(const char *name, const char *value)
-{
-	uint i;
-	struct nvram_tuple *t, *u, **prev;
-
-	/* Hash the name */
-	i = hash(name) % ARRAYSIZE(BCMINIT(nvram_hash));
-
-	/* Find the associated tuple in the hash table */
-	for (prev = &BCMINIT(nvram_hash)[i], t = *prev; t && strcmp(t->name, name); prev = &t->next, t = *prev);
-
-	/* (Re)allocate tuple */
-	if (!(u = BCMINIT(_nvram_realloc)(t, name, value)))
-		return -12; /* -ENOMEM */
-
-	/* Value reallocated */
-	if (t && t == u)
-		return 0;
-
-	/* Move old tuple to the dead table */
-	if (t) {
-		*prev = t->next;
-		t->next = nvram_dead;
-		nvram_dead = t;
+		for (i = 0; i < 0x1ff0; i++) {
+			if (*src == 0xFFFFFFFF)
+				break;
+			*dst++ = *src++;
+		}
+		cfe_env = 1;
+		return;
 	}
 
-	/* Add new tuple to the hash table */
-	u->next = BCMINIT(nvram_hash)[i];
-	BCMINIT(nvram_hash)[i] = u;
+	off = FLASH_MIN;
+	while (off <= lim) {
+		/* Windowed flash access */
+		header = (struct nvram_header *) KSEG1ADDR(base + off - NVRAM_SPACE);
+		if (header->magic == NVRAM_MAGIC)
+			goto found;
+		off <<= 1;
+	}
 
-	return 0;
+	/* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
+	header = (struct nvram_header *) KSEG1ADDR(base + 4 * 1024);
+	if (header->magic == NVRAM_MAGIC)
+		goto found;
+	
+	header = (struct nvram_header *) KSEG1ADDR(base + 1 * 1024);
+	if (header->magic == NVRAM_MAGIC)
+		goto found;
+	
+	printk("early_nvram_init: NVRAM not found\n");
+	return;
+
+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++ = ltoh32(*src++);
 }
 
-/* Unset the value of an NVRAM variable. Should be locked. */
-int 
-BCMINITFN(_nvram_unset)(const char *name)
+/* Early (before mm or mtd) read-only access to NVRAM */
+static char * __init
+early_nvram_get(const char *name)
 {
-	uint i;
-	struct nvram_tuple *t, **prev;
+	char *var, *value, *end, *eq;
 
 	if (!name)
-		return 0;
+		return NULL;
+
+	/* Too early? */
+	if (sbh == NULL)
+		return NULL;
 
-	/* Hash the name */
-	i = hash(name) % ARRAYSIZE(BCMINIT(nvram_hash));
+	if (!nvram_buf[0])
+		early_nvram_init();
 
-	/* Find the associated tuple in the hash table */
-	for (prev = &BCMINIT(nvram_hash)[i], t = *prev; t && strcmp(t->name, name); prev = &t->next, t = *prev);
+	if (cfe_env)
+		return cfe_env_get(nvram_buf, name);
 
-	/* Move it to the dead table */
-	if (t) {
-		*prev = t->next;
-		t->next = nvram_dead;
-		nvram_dead = t;
+	/* 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) {
+		if (!(eq = strchr(var, '=')))
+			break;
+		value = eq + 1;
+		if ((eq - var) == strlen(name) && strncmp(var, name, (eq - var)) == 0)
+			return value;
 	}
 
-	return 0;
+	return NULL;
 }
 
-/* Get all NVRAM variables. Should be locked. */
-int 
-BCMINITFN(_nvram_getall)(char *buf, int count)
+static int __init
+early_nvram_getall(char *buf, int count)
 {
-	uint i;
-	struct nvram_tuple *t;
+	char *var, *end;
 	int len = 0;
+	
+	/* Too early? */
+	if (sbh == NULL)
+		return -1;
+
+	if (!nvram_buf[0])
+		early_nvram_init();
 
 	bzero(buf, count);
 
 	/* Write name=value\0 ... \0\0 */
-	for (i = 0; i < ARRAYSIZE(BCMINIT(nvram_hash)); i++) {
-		for (t = BCMINIT(nvram_hash)[i]; t; t = t->next) {
-			if ((count - len) > (strlen(t->name) + 1 + strlen(t->value) + 1))
-				len += sprintf(buf + len, "%s=%s", t->name, t->value) + 1;
-			else
-				break;
-		}
+	var = &nvram_buf[sizeof(struct nvram_header)];
+	end = nvram_buf + sizeof(nvram_buf) - 2;
+	end[0] = end[1] = '\0';
+	for (; *var; var += strlen(var) + 1) {
+		if ((count - len) <= (strlen(var) + 1))
+			break;
+		len += sprintf(buf + len, "%s", var) + 1;
 	}
 
 	return 0;
 }
 
-/* Regenerate NVRAM. Should be locked. */
-int
-BCMINITFN(_nvram_commit)(struct nvram_header *header)
-{
-	char *init, *config, *refresh, *ncdl;
-	char *ptr, *end;
-	int i;
-	struct nvram_tuple *t;
-	struct nvram_header tmp;
-	uint8 crc;
-
-	/* Regenerate header */
-	header->magic = NVRAM_MAGIC;
-	header->crc_ver_init = (NVRAM_VERSION << 8);
-	if (!(init = BCMINIT(_nvram_get)("sdram_init")) ||
-	    !(config = BCMINIT(_nvram_get)("sdram_config")) ||
-	    !(refresh = BCMINIT(_nvram_get)("sdram_refresh")) ||
-	    !(ncdl = BCMINIT(_nvram_get)("sdram_ncdl"))) {
-		header->crc_ver_init |= SDRAM_INIT << 16;
-		header->config_refresh = SDRAM_CONFIG;
-		header->config_refresh |= SDRAM_REFRESH << 16;
-		header->config_ncdl = 0;
-	} else {
-		header->crc_ver_init |= (simple_strtoul(init, NULL, 0) & 0xffff) << 16;
-		header->config_refresh = simple_strtoul(config, NULL, 0) & 0xffff;
-		header->config_refresh |= (simple_strtoul(refresh, NULL, 0) & 0xffff) << 16;
-		header->config_ncdl = simple_strtoul(ncdl, NULL, 0);
-	}
-
-	/* Clear data area */
-	ptr = (char *) header + sizeof(struct nvram_header);
-	bzero(ptr, NVRAM_SPACE - sizeof(struct nvram_header));
 
-	/* Leave space for a double NUL at the end */
-	end = (char *) header + NVRAM_SPACE - 2;
-
-	/* Write out all tuples */
-	for (i = 0; i < ARRAYSIZE(BCMINIT(nvram_hash)); i++) {
-		for (t = BCMINIT(nvram_hash)[i]; t; t = t->next) {
-			if ((ptr + strlen(t->name) + 1 + strlen(t->value) + 1) > end)
-				break;
-			ptr += sprintf(ptr, "%s=%s", t->name, t->value) + 1;
-		}
-	}
-
-	/* End with a double NUL */
-	ptr += 2;
-
-	/* Set new length */
-	header->len = ROUNDUP(ptr - (char *) header, 4);
-
-	/* Little-endian CRC8 over the last 11 bytes of the header */
-	tmp.crc_ver_init = htol32(header->crc_ver_init);
-	tmp.config_refresh = htol32(header->config_refresh);
-	tmp.config_ncdl = htol32(header->config_ncdl);
-	crc = hndcrc8((char *) &tmp + 9, sizeof(struct nvram_header) - 9, 0xff);
-
-	/* Continue CRC8 over data bytes */
-	crc = hndcrc8((char *) &header[1], header->len - sizeof(struct nvram_header), crc);
-
-	/* Set new CRC8 */
-	header->crc_ver_init |= crc;
-
-	/* Reinitialize hash table */
-	return BCMINIT(nvram_rehash)(header);
+char *
+nvram_get(const char *name)
+{
+	return early_nvram_get(name);
 }
 
-/* Initialize hash table. Should be locked. */
-int 
-BCMINITFN(_nvram_init)(void)
+int
+nvram_getall(char *buf, int count)
 {
-	struct nvram_header *header;
+	unsigned long flags;
 	int ret;
 
-	if (!(header = (struct nvram_header *) kmalloc(NVRAM_SPACE, GFP_ATOMIC))) {
-		return -12; /* -ENOMEM */
-	}
-
-	if ((ret = BCMINIT(_nvram_read)(header)) == 0 &&
-	    header->magic == NVRAM_MAGIC)
-		BCMINIT(nvram_rehash)(header);
-
-	kfree(header);
-	return ret;
-}
-
-/* Free hash table. Should be locked. */
-void 
-BCMINITFN(_nvram_exit)(void)
-{
-	BCMINIT(nvram_free)();
+	return early_nvram_getall(buf, count);
 }
 
 /*
@@ -331,8 +228,7 @@ getvar(char *vars, const char *name)
 		if ((memcmp(s, name, len) == 0) && (s[len] == '='))
 			return (&s[len+1]);
 
-		while (*s++)
-			;
+		while (*s++);
 	}
 
 	/* then query nvram */
@@ -354,4 +250,3 @@ getintvar(char *vars, const char *name)
 	return (simple_strtoul(val, NULL, 0));
 }
 
-
diff --git a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/nvram_linux.c b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/nvram_linux.c
deleted file mode 100644
index b04815d902..0000000000
--- a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/nvram_linux.c
+++ /dev/null
@@ -1,721 +0,0 @@
-/*
- * NVRAM variable manipulation (Linux kernel half)
- *
- * Copyright 2006, Broadcom Corporation
- * All Rights Reserved.
- * 
- * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
- * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
- * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
- *
- */
-
-#include <linux/config.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/slab.h>
-#include <linux/bootmem.h>
-#include <linux/wrapper.h>
-#include <linux/fs.h>
-#include <linux/miscdevice.h>
-#include <linux/mtd/mtd.h>
-#include <asm/addrspace.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
-
-#include <typedefs.h>
-#include <osl.h>
-#include <bcmendian.h>
-#include <bcmnvram.h>
-#include <sbconfig.h>
-#include <sbchipc.h>
-#include <sbutils.h>
-#include <hndmips.h>
-#include <sflash.h>
-
-/* In BSS to minimize text size and page aligned so it can be mmap()-ed */
-static char nvram_buf[NVRAM_SPACE] __attribute__((aligned(PAGE_SIZE)));
-
-#ifdef MODULE
-
-#define early_nvram_get(name) nvram_get(name)
-
-#else /* !MODULE */
-
-/* Global SB handle */
-extern void *bcm947xx_sbh;
-extern spinlock_t bcm947xx_sbh_lock;
-
-static int cfe_env;
-extern char *cfe_env_get(char *nv_buf, const char *name);
-
-/* Convenience */
-#define sbh bcm947xx_sbh
-#define sbh_lock bcm947xx_sbh_lock
-#define KB * 1024
-#define MB * 1024 * 1024
-
-/* Probe for NVRAM header */
-static void __init
-early_nvram_init(void)
-{
-	struct nvram_header *header;
-	chipcregs_t *cc;
-	struct sflash *info = NULL;
-	int i;
-	uint32 base, off, lim;
-	u32 *src, *dst;
-
-	if ((cc = sb_setcore(sbh, SB_CC, 0)) != NULL) {
-		base = KSEG1ADDR(SB_FLASH2);
-		switch (readl(&cc->capabilities) & CC_CAP_FLASH_MASK) {
-		case PFLASH:
-			lim = SB_FLASH2_SZ;
-			break;
-
-		case SFLASH_ST:
-		case SFLASH_AT:
-			if ((info = sflash_init(sbh,cc)) == NULL)
-				return;
-			lim = info->size;
-			break;
-
-		case FLASH_NONE:
-		default:
-			return;
-		}
-	} else {
-		/* extif assumed, Stop at 4 MB */
-		base = KSEG1ADDR(SB_FLASH1);
-		lim = SB_FLASH1_SZ;
-	}
-
-	/* XXX: hack for supporting the CFE environment stuff on WGT634U */
-	src = (u32 *) KSEG1ADDR(base + 8 * 1024 * 1024 - 0x2000);
-	dst = (u32 *) nvram_buf;
-	if ((lim == 0x02000000) && ((*src & 0xff00ff) == 0x000001)) {
-		printk("early_nvram_init: WGT634U NVRAM found.\n");
-
-		for (i = 0; i < 0x1ff0; i++) {
-			if (*src == 0xFFFFFFFF)
-				break;
-			*dst++ = *src++;
-		}
-		cfe_env = 1;
-		return;
-	}
-
-	off = FLASH_MIN;
-	while (off <= lim) {
-		/* Windowed flash access */
-		header = (struct nvram_header *) KSEG1ADDR(base + off - NVRAM_SPACE);
-		if (header->magic == NVRAM_MAGIC)
-			goto found;
-		off <<= 1;
-	}
-
-	/* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
-	header = (struct nvram_header *) KSEG1ADDR(base + 4 KB);
-	if (header->magic == NVRAM_MAGIC)
-		goto found;
-	
-	header = (struct nvram_header *) KSEG1ADDR(base + 1 KB);
-	if (header->magic == NVRAM_MAGIC)
-		goto found;
-	
-	printk("early_nvram_init: NVRAM not found\n");
-	return;
-
-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++ = ltoh32(*src++);
-}
-
-/* Early (before mm or mtd) read-only access to NVRAM */
-static char * __init
-early_nvram_get(const char *name)
-{
-	char *var, *value, *end, *eq;
-
-	if (!name)
-		return NULL;
-
-	/* Too early? */
-	if (sbh == NULL)
-		return NULL;
-
-	if (!nvram_buf[0])
-		early_nvram_init();
-
-	if (cfe_env)
-		return cfe_env_get(nvram_buf, name);
-
-	/* 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) {
-		if (!(eq = strchr(var, '=')))
-			break;
-		value = eq + 1;
-		if ((eq - var) == strlen(name) && strncmp(var, name, (eq - var)) == 0)
-			return value;
-	}
-
-	return NULL;
-}
-
-static int __init
-early_nvram_getall(char *buf, int count)
-{
-	char *var, *end;
-	int len = 0;
-	
-	/* Too early? */
-	if (sbh == NULL)
-		return -1;
-
-	if (!nvram_buf[0])
-		early_nvram_init();
-
-	bzero(buf, count);
-
-	/* Write name=value\0 ... \0\0 */
-	var = &nvram_buf[sizeof(struct nvram_header)];
-	end = nvram_buf + sizeof(nvram_buf) - 2;
-	end[0] = end[1] = '\0';
-	for (; *var; var += strlen(var) + 1) {
-		if ((count - len) <= (strlen(var) + 1))
-			break;
-		len += sprintf(buf + len, "%s", var) + 1;
-	}
-
-	return 0;
-}
-#endif /* !MODULE */
-
-extern char * _nvram_get(const char *name);
-extern int _nvram_set(const char *name, const char *value);
-extern int _nvram_unset(const char *name);
-extern int _nvram_getall(char *buf, int count);
-extern int _nvram_commit(struct nvram_header *header);
-extern int _nvram_init(void *sbh);
-extern void _nvram_exit(void);
-
-/* Globals */
-static spinlock_t nvram_lock = SPIN_LOCK_UNLOCKED;
-static struct semaphore nvram_sem;
-static unsigned long nvram_offset = 0;
-static int nvram_major = -1;
-static devfs_handle_t nvram_handle = NULL;
-static struct mtd_info *nvram_mtd = NULL;
-
-int
-_nvram_read(char *buf)
-{
-	struct nvram_header *header = (struct nvram_header *) buf;
-	size_t len;
-
-	if (!nvram_mtd ||
-	    MTD_READ(nvram_mtd, nvram_mtd->size - NVRAM_SPACE, NVRAM_SPACE, &len, buf) ||
-	    len != NVRAM_SPACE ||
-	    header->magic != NVRAM_MAGIC) {
-		/* Maybe we can recover some data from early initialization */
-		memcpy(buf, nvram_buf, NVRAM_SPACE);
-	}
-
-	return 0;
-}
-
-struct nvram_tuple *
-_nvram_realloc(struct nvram_tuple *t, const char *name, const char *value)
-{
-	if ((nvram_offset + strlen(value) + 1) > NVRAM_SPACE)
-		return NULL;
-
-	if (!t) {
-		if (!(t = kmalloc(sizeof(struct nvram_tuple) + strlen(name) + 1, GFP_ATOMIC)))
-			return NULL;
-
-		/* Copy name */
-		t->name = (char *) &t[1];
-		strcpy(t->name, name);
-
-		t->value = NULL;
-	}
-
-	/* Copy value */
-	if (!t->value || strcmp(t->value, value)) {
-		t->value = &nvram_buf[nvram_offset];
-		strcpy(t->value, value);
-		nvram_offset += strlen(value) + 1;
-	}
-
-	return t;
-}
-
-void
-_nvram_free(struct nvram_tuple *t)
-{
-	if (!t)
-		nvram_offset = 0;
-	else
-		kfree(t);
-}
-
-int
-nvram_set(const char *name, const char *value)
-{
-	unsigned long flags;
-	int ret;
-	struct nvram_header *header;
-
-	spin_lock_irqsave(&nvram_lock, flags);
-	if ((ret = _nvram_set(name, value))) {
-		/* Consolidate space and try again */
-		if ((header = kmalloc(NVRAM_SPACE, GFP_ATOMIC))) {
-			if (_nvram_commit(header) == 0)
-				ret = _nvram_set(name, value);
-			kfree(header);
-		}
-	}
-	spin_unlock_irqrestore(&nvram_lock, flags);
-
-	return ret;
-}
-
-char *
-real_nvram_get(const char *name)
-{
-	unsigned long flags;
-	char *value;
-
-	spin_lock_irqsave(&nvram_lock, flags);
-	value = _nvram_get(name);
-	spin_unlock_irqrestore(&nvram_lock, flags);
-
-	return value;
-}
-
-char *
-nvram_get(const char *name)
-{
-	if (nvram_major >= 0)
-		return real_nvram_get(name);
-	else
-		return early_nvram_get(name);
-}
-
-int
-nvram_unset(const char *name)
-{
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&nvram_lock, flags);
-	ret = _nvram_unset(name);
-	spin_unlock_irqrestore(&nvram_lock, flags);
-
-	return ret;
-}
-
-static void
-erase_callback(struct erase_info *done)
-{
-	wait_queue_head_t *wait_q = (wait_queue_head_t *) done->priv;
-	wake_up(wait_q);
-}
-
-int
-nvram_commit(void)
-{
-	char *buf;
-	size_t erasesize, len, magic_len;
-	unsigned int i;
-	int ret;
-	struct nvram_header *header;
-	unsigned long flags;
-	u_int32_t offset;
-	DECLARE_WAITQUEUE(wait, current);
-	wait_queue_head_t wait_q;
-	struct erase_info erase;
-	u_int32_t magic_offset = 0; /* Offset for writing MAGIC # */
-
-	if (!nvram_mtd) {
-		printk("nvram_commit: NVRAM not found\n");
-		return -ENODEV;
-	}
-
-	if (in_interrupt()) {
-		printk("nvram_commit: not committing in interrupt\n");
-		return -EINVAL;
-	}
-
-	/* Backup sector blocks to be erased */
-	erasesize = ROUNDUP(NVRAM_SPACE, nvram_mtd->erasesize);
-	if (!(buf = kmalloc(erasesize, GFP_KERNEL))) {
-		printk("nvram_commit: out of memory\n");
-		return -ENOMEM;
-	}
-
-	down(&nvram_sem);
-
-	if ((i = erasesize - NVRAM_SPACE) > 0) {
-		offset = nvram_mtd->size - erasesize;
-		len = 0;
-		ret = MTD_READ(nvram_mtd, offset, i, &len, buf);
-		if (ret || len != i) {
-			printk("nvram_commit: read error ret = %d, len = %d/%d\n", ret, len, i);
-			ret = -EIO;
-			goto done;
-		}
-		header = (struct nvram_header *)(buf + i);
-		magic_offset = i + ((void *)&header->magic - (void *)header);
-	} else {
-		offset = nvram_mtd->size - NVRAM_SPACE;
-		magic_offset = ((void *)&header->magic - (void *)header);
-		header = (struct nvram_header *)buf;
-	}
-
-	/* clear the existing magic # to mark the NVRAM as unusable 
-		 we can pull MAGIC bits low without erase	*/
-	header->magic = NVRAM_CLEAR_MAGIC; /* All zeros magic */
-
-	/* Unlock sector blocks (for Intel 28F320C3B flash) , 20060309 */
-	if(nvram_mtd->unlock)
-		nvram_mtd->unlock(nvram_mtd, offset, nvram_mtd->erasesize);
-
-	ret = MTD_WRITE(nvram_mtd, offset + magic_offset, sizeof(header->magic), 
-									&magic_len, (char *)&header->magic);
-	if (ret || magic_len != sizeof(header->magic)) {
-		printk("nvram_commit: clear MAGIC error\n");
-		ret = -EIO;
-		goto done;
-	}
-
-	header->magic = NVRAM_MAGIC; /* reset MAGIC before we regenerate the NVRAM,
-																otherwise we'll have an incorrect CRC */
-	/* Regenerate NVRAM */
-	spin_lock_irqsave(&nvram_lock, flags);
-	ret = _nvram_commit(header);
-	spin_unlock_irqrestore(&nvram_lock, flags);
-	if (ret)
-		goto done;
-
-	/* Erase sector blocks */
-	init_waitqueue_head(&wait_q);
-	for (; offset < nvram_mtd->size - NVRAM_SPACE + header->len; offset += nvram_mtd->erasesize) {
-		erase.mtd = nvram_mtd;
-		erase.addr = offset;
-		erase.len = nvram_mtd->erasesize;
-		erase.callback = erase_callback;
-		erase.priv = (u_long) &wait_q;
-
-		set_current_state(TASK_INTERRUPTIBLE);
-		add_wait_queue(&wait_q, &wait);
-
-		/* Unlock sector blocks */
-		if (nvram_mtd->unlock)
-			nvram_mtd->unlock(nvram_mtd, offset, nvram_mtd->erasesize);
-
-		if ((ret = MTD_ERASE(nvram_mtd, &erase))) {
-			set_current_state(TASK_RUNNING);
-			remove_wait_queue(&wait_q, &wait);
-			printk("nvram_commit: erase error\n");
-			goto done;
-		}
-
-		/* Wait for erase to finish */
-		schedule();
-		remove_wait_queue(&wait_q, &wait);
-	}
-
-	/* Write partition up to end of data area */
-	header->magic = NVRAM_INVALID_MAGIC; /* All ones magic */
-	offset = nvram_mtd->size - erasesize;
-	i = erasesize - NVRAM_SPACE + header->len;
-	ret = MTD_WRITE(nvram_mtd, offset, i, &len, buf);
-	if (ret || len != i) {
-		printk("nvram_commit: write error\n");
-		ret = -EIO;
-		goto done;
-	}
-
-	/* Now mark the NVRAM in flash as "valid" by setting the correct
-		 MAGIC # */
-	header->magic = NVRAM_MAGIC;
-	ret = MTD_WRITE(nvram_mtd, offset + magic_offset, sizeof(header->magic), 
-									&magic_len, (char *)&header->magic);
-	if (ret || magic_len != sizeof(header->magic)) {
-		printk("nvram_commit: write MAGIC error\n");
-		ret = -EIO;
-		goto done;
-	}
-
-	/*
-	 * Reading a few bytes back here will put the device
-	 * back to the correct mode on certain flashes */
-	offset = nvram_mtd->size - erasesize;
-	ret = MTD_READ(nvram_mtd, offset, 4, &len, buf);
-
- done:
-	up(&nvram_sem);
-	kfree(buf);
-
-	return ret;
-}
-
-int
-nvram_getall(char *buf, int count)
-{
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&nvram_lock, flags);
-	if (nvram_major >= 0)
-		ret = _nvram_getall(buf, count);
-	else
-		ret = early_nvram_getall(buf, count);
-	spin_unlock_irqrestore(&nvram_lock, flags);
-
-	return ret;
-}
-
-
-
-
-
-
-
-/* User mode interface below */
-
-static ssize_t
-dev_nvram_read(struct file *file, char *buf, size_t count, loff_t *ppos)
-{
-	char tmp[100], *name = tmp, *value;
-	ssize_t ret;
-	unsigned long off;
-
-	if (count > sizeof(tmp)) {
-		if (!(name = kmalloc(count, GFP_KERNEL)))
-			return -ENOMEM;
-	}
-
-	if (copy_from_user(name, buf, count)) {
-		ret = -EFAULT;
-		goto done;
-	}
-
-	if (*name == '\0') {
-		/* Get all variables */
-		ret = nvram_getall(name, count);
-		if (ret == 0) {
-			if (copy_to_user(buf, name, count)) {
-				ret = -EFAULT;
-				goto done;
-			}
-			ret = count;
-		}
-	} else {
-		if (!(value = nvram_get(name))) {
-			ret = 0;
-			goto done;
-		}
-
-		/* Provide the offset into mmap() space */
-		off = (unsigned long) value - (unsigned long) nvram_buf;
-
-		if (put_user(off, (unsigned long *) buf)) {
-			ret = -EFAULT;
-			goto done;
-		}
-
-		ret = sizeof(unsigned long);
-	}
-
-	flush_cache_all();	
- 
-done:
-	if (name != tmp)
-		kfree(name);
-
-	return ret;
-}
-
-static ssize_t
-dev_nvram_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
-{
-	char tmp[100], *name = tmp, *value;
-	ssize_t ret;
-
-	if (count > sizeof(tmp)) {
-		if (!(name = kmalloc(count, GFP_KERNEL)))
-			return -ENOMEM;
-	}
-
-	if (copy_from_user(name, buf, count)) {
-		ret = -EFAULT;
-		goto done;
-	}
-
-	value = name;
-	name = strsep(&value, "=");
-	if (value)
-		ret = nvram_set(name, value) ? : count;
-	else
-		ret = nvram_unset(name) ? : count;
-
- done:
-	if (name != tmp)
-		kfree(name);
-
-	return ret;
-}	
-
-static int
-dev_nvram_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
-{
-	if (cmd != NVRAM_MAGIC)
-		return -EINVAL;
-
-	return nvram_commit();
-}
-
-static int
-dev_nvram_mmap(struct file *file, struct vm_area_struct *vma)
-{
-	unsigned long offset = virt_to_phys(nvram_buf);
-
-	if (remap_page_range(vma->vm_start, offset, vma->vm_end-vma->vm_start,
-			     vma->vm_page_prot))
-		return -EAGAIN;
-
-	return 0;
-}
-
-static int
-dev_nvram_open(struct inode *inode, struct file * file)
-{
-	MOD_INC_USE_COUNT;
-	return 0;
-}
-
-static int
-dev_nvram_release(struct inode *inode, struct file * file)
-{
-	MOD_DEC_USE_COUNT;
-	return 0;
-}
-
-static struct file_operations dev_nvram_fops = {
-	owner:		THIS_MODULE,
-	open:		dev_nvram_open,
-	release:	dev_nvram_release,
-	read:		dev_nvram_read,
-	write:		dev_nvram_write,
-	ioctl:		dev_nvram_ioctl,
-	mmap:		dev_nvram_mmap,
-};
-
-static void
-dev_nvram_exit(void)
-{
-	int order = 0;
-	struct page *page, *end;
-
-	if (nvram_handle)
-		devfs_unregister(nvram_handle);
-
-	if (nvram_major >= 0)
-		devfs_unregister_chrdev(nvram_major, "nvram");
-
-	if (nvram_mtd)
-		put_mtd_device(nvram_mtd);
-
-	while ((PAGE_SIZE << order) < NVRAM_SPACE)
-		order++;
-	end = virt_to_page(nvram_buf + (PAGE_SIZE << order) - 1);
-	for (page = virt_to_page(nvram_buf); page <= end; page++)
-		mem_map_unreserve(page);
-
-	_nvram_exit();
-}
-
-static int __init
-dev_nvram_init(void)
-{
-	int order = 0, ret = 0;
-	struct page *page, *end;
-	unsigned int i;
-
-	/* Allocate and reserve memory to mmap() */
-	while ((PAGE_SIZE << order) < NVRAM_SPACE)
-		order++;
-	end = virt_to_page(nvram_buf + (PAGE_SIZE << order) - 1);
-	for (page = virt_to_page(nvram_buf); page <= end; page++)
-		mem_map_reserve(page);
-
-#ifdef CONFIG_MTD
-	/* Find associated MTD device */
-	for (i = 0; i < MAX_MTD_DEVICES; i++) {
-		nvram_mtd = get_mtd_device(NULL, i);
-		if (nvram_mtd) {
-			if (!strcmp(nvram_mtd->name, "nvram") &&
-			    nvram_mtd->size >= NVRAM_SPACE)
-				break;
-			put_mtd_device(nvram_mtd);
-		}
-	}
-	if (i >= MAX_MTD_DEVICES)
-		nvram_mtd = NULL;
-#endif
-
-	/* Initialize hash table lock */
-	spin_lock_init(&nvram_lock);
-
-	/* Initialize commit semaphore */
-	init_MUTEX(&nvram_sem);
-
-	/* Register char device */
-	if ((nvram_major = devfs_register_chrdev(0, "nvram", &dev_nvram_fops)) < 0) {
-		ret = nvram_major;
-		goto err;
-	}
-
-	/* Initialize hash table */
-	_nvram_init(sbh);
-
-	/* Create /dev/nvram handle */
-	nvram_handle = devfs_register(NULL, "nvram", DEVFS_FL_NONE, nvram_major, 0,
-				      S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, &dev_nvram_fops, NULL);
-
-	/* Set the SDRAM NCDL value into NVRAM if not already done */
-	if (getintvar(NULL, "sdram_ncdl") == 0) {
-		unsigned int ncdl;
-		char buf[] = "0x00000000";
-
-		if ((ncdl = sb_memc_get_ncdl(sbh))) {
-			sprintf(buf, "0x%08x", ncdl);
-			nvram_set("sdram_ncdl", buf);
-			nvram_commit();
-		}
-	}
-
-	return 0;
-
- err:
-	dev_nvram_exit();
-	return ret;
-}
-
-module_init(dev_nvram_init);
-module_exit(dev_nvram_exit);