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

SVN-Revision: 15440

1 files changed, 152 insertions, 257 deletions

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 c37023b..e93752a 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));
 }
 
-