/*
- * 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 <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);
}
/*
if ((memcmp(s, name, len) == 0) && (s[len] == '='))
return (&s[len+1]);
- while (*s++)
- ;
+ while (*s++);
}
/* then query nvram */
return (simple_strtoul(val, NULL, 0));
}
-
+++ /dev/null
-/*
- * 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);
projects / openwrt.git / commitdiff