/*
- * 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
*
*/
+#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 <bcmutils.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);
+ case FLASH_NONE:
+ default:
+ return;
+ }
+ } else {
+ /* extif assumed, Stop at 4 MB */
+ base = KSEG1ADDR(SB_FLASH1);
+ lim = SB_FLASH1_SZ;
}
- if (!BCMINIT(_nvram_get)("sdram_refresh")) {
- sprintf(buf, "0x%04X", (uint16)((header->config_refresh >> 16) & 0xffff));
- BCMINIT(_nvram_set)("sdram_refresh", buf);
+
+ /* 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;
}
- if (!BCMINIT(_nvram_get)("sdram_ncdl")) {
- sprintf(buf, "0x%08X", header->config_ncdl);
- BCMINIT(_nvram_set)("sdram_ncdl", buf);
+
+ 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++);
}
-/* Get the value of an NVRAM variable. Should be locked. */
-char *
-BCMINITFN(_nvram_get)(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;
- char *value;
+ char *var, *value, *end, *eq;
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;
-
- 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);
+ /* Too early? */
+ if (sbh == NULL)
+ return NULL;
- /* (Re)allocate tuple */
- if (!(u = BCMINIT(_nvram_realloc)(t, name, value)))
- return -12; /* -ENOMEM */
+ if (!nvram_buf[0])
+ early_nvram_init();
- /* Value reallocated */
- if (t && t == u)
- return 0;
+ if (cfe_env)
+ return cfe_env_get(nvram_buf, name);
- /* Move old tuple 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;
}
- /* Add new tuple to the hash table */
- u->next = BCMINIT(nvram_hash)[i];
- BCMINIT(nvram_hash)[i] = u;
-
- return 0;
+ return NULL;
}
-/* Unset the value of an NVRAM variable. Should be locked. */
-int
-BCMINITFN(_nvram_unset)(const char *name)
+static int __init
+early_nvram_getall(char *buf, int count)
{
- uint i;
- struct nvram_tuple *t, **prev;
-
- if (!name)
- return 0;
+ char *var, *end;
+ int len = 0;
+
+ /* Too early? */
+ if (sbh == NULL)
+ return -1;
- /* 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);
+ bzero(buf, count);
- /* Move it to the dead table */
- if (t) {
- *prev = t->next;
- t->next = nvram_dead;
- nvram_dead = t;
+ /* 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;
}
-/* Get all NVRAM variables. Should be locked. */
-int
-BCMINITFN(_nvram_getall)(char *buf, int count)
-{
- uint i;
- struct nvram_tuple *t;
- int len = 0;
-
- 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;
- }
- }
- return 0;
+char *
+nvram_get(const char *name)
+{
+ return early_nvram_get(name);
}
-/* Regenerate NVRAM. Should be locked. */
int
-BCMINITFN(_nvram_commit)(struct nvram_header *header)
+nvram_getall(char *buf, int count)
{
- 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 |= (bcm_strtoul(init, NULL, 0) & 0xffff) << 16;
- header->config_refresh = bcm_strtoul(config, NULL, 0) & 0xffff;
- header->config_refresh |= (bcm_strtoul(refresh, NULL, 0) & 0xffff) << 16;
- header->config_ncdl = bcm_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;
- }
- }
+ unsigned long flags;
+ int ret;
- /* End with a double NUL */
- ptr += 2;
+ return early_nvram_getall(buf, count);
+}
- /* Set new length */
- header->len = ROUNDUP(ptr - (char *) header, 4);
+/*
+ * Search the name=value vars for a specific one and return its value.
+ * Returns NULL if not found.
+ */
+char*
+getvar(char *vars, const char *name)
+{
+ char *s;
+ int len;
- /* 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, CRC8_INIT_VALUE);
+ len = strlen(name);
- /* Continue CRC8 over data bytes */
- crc = hndcrc8((char *) &header[1], header->len - sizeof(struct nvram_header), crc);
+ /* first look in vars[] */
+ for (s = vars; s && *s;) {
+ /* CSTYLED */
+ if ((memcmp(s, name, len) == 0) && (s[len] == '='))
+ return (&s[len+1]);
- /* Set new CRC8 */
- header->crc_ver_init |= crc;
+ while (*s++);
+ }
- /* Reinitialize hash table */
- return BCMINIT(nvram_rehash)(header);
+ /* then query nvram */
+ return (nvram_get(name));
}
-/* Initialize hash table. Should be locked. */
-int
-BCMINITFN(_nvram_init)(void)
+/*
+ * Search the vars for a specific one and return its value as
+ * an integer. Returns 0 if not found.
+ */
+int
+getintvar(char *vars, const char *name)
{
- struct nvram_header *header;
- int ret;
-
- if (!(header = (struct nvram_header *) kmalloc(NVRAM_SPACE, GFP_ATOMIC))) {
- return -12; /* -ENOMEM */
- }
+ char *val;
- if ((ret = BCMINIT(_nvram_read)(header)) == 0 &&
- header->magic == NVRAM_MAGIC)
- BCMINIT(nvram_rehash)(header);
+ if ((val = getvar(vars, name)) == NULL)
+ return (0);
- kfree(header);
- return ret;
+ return (simple_strtoul(val, NULL, 0));
}
-/* Free hash table. Should be locked. */
-void
-BCMINITFN(_nvram_exit)(void)
-{
- BCMINIT(nvram_free)();
-}
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