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authorRafał Miłecki <zajec5@gmail.com>2014-12-10 21:50:57 +0000
committerRafał Miłecki <zajec5@gmail.com>2014-12-10 21:50:57 +0000
commit40d94a3ef026e9e9f27203f744af405fb2e5c82b (patch)
tree7d15a6ed54dbeb4f254454cbe4eafaf9a761fc2b /target/linux/bcm53xx/files
parentba81966001af4ff028795b6edbf25ce49596d654 (diff)
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bcm53xx: backport NVRAM driver sent upstream
Signed-off-by: Rafał Miłecki <zajec5@gmail.com> SVN-Revision: 43612
Diffstat (limited to 'target/linux/bcm53xx/files')
-rw-r--r--target/linux/bcm53xx/files/drivers/firmware/broadcom/Kconfig11
-rw-r--r--target/linux/bcm53xx/files/drivers/firmware/broadcom/Makefile1
-rw-r--r--target/linux/bcm53xx/files/drivers/firmware/broadcom/bcm47xx_nvram.c232
-rw-r--r--target/linux/bcm53xx/files/drivers/misc/bcm47xx-nvram.c217
-rw-r--r--target/linux/bcm53xx/files/include/linux/bcm47xx_nvram.h22
5 files changed, 255 insertions, 228 deletions
diff --git a/target/linux/bcm53xx/files/drivers/firmware/broadcom/Kconfig b/target/linux/bcm53xx/files/drivers/firmware/broadcom/Kconfig
new file mode 100644
index 0000000000..6bed119930
--- /dev/null
+++ b/target/linux/bcm53xx/files/drivers/firmware/broadcom/Kconfig
@@ -0,0 +1,11 @@
+config BCM47XX_NVRAM
+ bool "Broadcom NVRAM driver"
+ depends on BCM47XX || ARCH_BCM_5301X
+ help
+ Broadcom home routers contain flash partition called "nvram" with all
+ important hardware configuration as well as some minor user setup.
+ NVRAM partition contains a text-like data representing name=value
+ pairs.
+ This driver provides an easy way to get value of requested parameter.
+ It simply reads content of NVRAM and parses it. It doesn't control any
+ hardware part itself.
diff --git a/target/linux/bcm53xx/files/drivers/firmware/broadcom/Makefile b/target/linux/bcm53xx/files/drivers/firmware/broadcom/Makefile
new file mode 100644
index 0000000000..d0e683583c
--- /dev/null
+++ b/target/linux/bcm53xx/files/drivers/firmware/broadcom/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_BCM47XX_NVRAM) += bcm47xx_nvram.o
diff --git a/target/linux/bcm53xx/files/drivers/firmware/broadcom/bcm47xx_nvram.c b/target/linux/bcm53xx/files/drivers/firmware/broadcom/bcm47xx_nvram.c
new file mode 100644
index 0000000000..b6e1cc733d
--- /dev/null
+++ b/target/linux/bcm53xx/files/drivers/firmware/broadcom/bcm47xx_nvram.c
@@ -0,0 +1,232 @@
+/*
+ * BCM947xx nvram variable access
+ *
+ * Copyright (C) 2005 Broadcom Corporation
+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2010-2012 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/types.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/mtd/mtd.h>
+#include <linux/bcm47xx_nvram.h>
+
+#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */
+#define NVRAM_SPACE 0x8000
+#define NVRAM_MAX_GPIO_ENTRIES 32
+#define NVRAM_MAX_GPIO_VALUE_LEN 30
+
+#define FLASH_MIN 0x00020000 /* Minimum flash size */
+
+struct nvram_header {
+ u32 magic;
+ u32 len;
+ u32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
+ u32 config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */
+ u32 config_ncdl; /* ncdl values for memc */
+};
+
+static char nvram_buf[NVRAM_SPACE];
+static const u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000};
+
+static u32 find_nvram_size(void __iomem *end)
+{
+ struct nvram_header __iomem *header;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) {
+ header = (struct nvram_header *)(end - nvram_sizes[i]);
+ if (header->magic == NVRAM_MAGIC)
+ return nvram_sizes[i];
+ }
+
+ return 0;
+}
+
+/* Probe for NVRAM header */
+static int nvram_find_and_copy(void __iomem *iobase, u32 lim)
+{
+ struct nvram_header __iomem *header;
+ int i;
+ u32 off;
+ u32 *src, *dst;
+ u32 size;
+
+ if (nvram_buf[0]) {
+ pr_warn("nvram already initialized\n");
+ return -EEXIST;
+ }
+
+ /* TODO: when nvram is on nand flash check for bad blocks first. */
+ off = FLASH_MIN;
+ while (off <= lim) {
+ /* Windowed flash access */
+ size = find_nvram_size(iobase + off);
+ if (size) {
+ header = (struct nvram_header *)(iobase + off - size);
+ goto found;
+ }
+ off <<= 1;
+ }
+
+ /* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
+ header = (struct nvram_header *)(iobase + 4096);
+ if (header->magic == NVRAM_MAGIC) {
+ size = NVRAM_SPACE;
+ goto found;
+ }
+
+ header = (struct nvram_header *)(iobase + 1024);
+ if (header->magic == NVRAM_MAGIC) {
+ size = NVRAM_SPACE;
+ goto found;
+ }
+
+ pr_err("no nvram found\n");
+ return -ENXIO;
+
+found:
+ if (header->len > size)
+ pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n");
+ if (header->len > NVRAM_SPACE)
+ pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
+ header->len, NVRAM_SPACE);
+
+ src = (u32 *)header;
+ dst = (u32 *)nvram_buf;
+ for (i = 0; i < sizeof(struct nvram_header); i += 4)
+ *dst++ = __raw_readl(src++);
+ for (; i < header->len && i < NVRAM_SPACE && i < size; i += 4)
+ *dst++ = readl(src++);
+
+ return 0;
+}
+
+/*
+ * On bcm47xx we need access to the NVRAM very early, so we can't use mtd
+ * subsystem to access flash. We can't even use platform device / driver to
+ * store memory offset.
+ * To handle this we provide following symbol. It's supposed to be called as
+ * soon as we get info about flash device, before any NVRAM entry is needed.
+ */
+int bcm47xx_nvram_init_from_mem(u32 base, u32 lim)
+{
+ void __iomem *iobase;
+ int err;
+
+ iobase = ioremap_nocache(base, lim);
+ if (!iobase)
+ return -ENOMEM;
+
+ err = nvram_find_and_copy(iobase, lim);
+
+ iounmap(iobase);
+
+ return err;
+}
+
+static int nvram_init(void)
+{
+#ifdef CONFIG_MTD
+ struct mtd_info *mtd;
+ struct nvram_header header;
+ size_t bytes_read;
+ int err, i;
+
+ mtd = get_mtd_device_nm("nvram");
+ if (IS_ERR(mtd))
+ return -ENODEV;
+
+ for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) {
+ loff_t from = mtd->size - nvram_sizes[i];
+
+ if (from < 0)
+ continue;
+
+ err = mtd_read(mtd, from, sizeof(header), &bytes_read,
+ (uint8_t *)&header);
+ if (!err && header.magic == NVRAM_MAGIC) {
+ u8 *dst = (uint8_t *)nvram_buf;
+ size_t len = header.len;
+
+ if (header.len > NVRAM_SPACE) {
+ pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
+ header.len, NVRAM_SPACE);
+ len = NVRAM_SPACE;
+ }
+
+ err = mtd_read(mtd, from, len, &bytes_read, dst);
+ if (err)
+ return err;
+
+ return 0;
+ }
+ }
+#endif
+
+ return -ENXIO;
+}
+
+int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len)
+{
+ char *var, *value, *end, *eq;
+ int data_left, err;
+
+ if (!name)
+ return -EINVAL;
+
+ if (!nvram_buf[0]) {
+ err = 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] = '\0';
+ end[1] = '\0';
+ for (; *var; var = value + strlen(value) + 1) {
+ data_left = end - var;
+
+ eq = strnchr(var, data_left, '=');
+ 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(bcm47xx_nvram_getenv);
+
+int bcm47xx_nvram_gpio_pin(const char *name)
+{
+ int i, err;
+ char nvram_var[] = "gpioXX";
+ char buf[NVRAM_MAX_GPIO_VALUE_LEN];
+
+ /* TODO: Optimize it to don't call getenv so many times */
+ for (i = 0; i < NVRAM_MAX_GPIO_ENTRIES; i++) {
+ err = snprintf(nvram_var, sizeof(nvram_var), "gpio%i", i);
+ if (err <= 0)
+ continue;
+ err = bcm47xx_nvram_getenv(nvram_var, buf, sizeof(buf));
+ if (err <= 0)
+ continue;
+ if (!strcmp(name, buf))
+ return i;
+ }
+ return -ENOENT;
+}
+EXPORT_SYMBOL(bcm47xx_nvram_gpio_pin);
+
+MODULE_LICENSE("GPLv2");
diff --git a/target/linux/bcm53xx/files/drivers/misc/bcm47xx-nvram.c b/target/linux/bcm53xx/files/drivers/misc/bcm47xx-nvram.c
deleted file mode 100644
index d1f9d7c6ae..0000000000
--- a/target/linux/bcm53xx/files/drivers/misc/bcm47xx-nvram.c
+++ /dev/null
@@ -1,217 +0,0 @@
-/*
- * BCM947xx nvram variable access
- *
- * Copyright (C) 2005 Broadcom Corporation
- * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2010-2014 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/types.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/of_address.h>
-#include <linux/device.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/bcm47xx_nvram.h>
-
-#define NVRAM_HEADER 0x48534C46 /* 'FLSH' */
-#define NVRAM_SPACE 0x8000
-
-#define FLASH_MIN 0x00020000 /* Minimum flash size */
-
-struct nvram_header {
- u32 magic;
- u32 len;
- u32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
- u32 config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */
- u32 config_ncdl; /* ncdl values for memc */
-};
-
-struct bcm47xx_nvram {
- size_t nvram_len;
- char *nvram_buf;
-};
-
-static struct bcm47xx_nvram *nvram = NULL;
-
-static const u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000};
-
-static u32 find_nvram_size(void __iomem *end)
-{
- struct nvram_header __iomem *header;
- int i;
-
- for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) {
- header = (struct nvram_header __iomem *)(end - nvram_sizes[i]);
- if (__raw_readl(&header->magic) == NVRAM_HEADER)
- return nvram_sizes[i];
- }
-
- return 0;
-}
-
-/* Probe for NVRAM header */
-static int nvram_find_and_copy(struct device *dev, void __iomem *base,
- size_t len, char **nvram_buf,
- size_t *nvram_len)
-{
- struct nvram_header __iomem *header;
- int i;
- u32 off;
- u32 *dst;
- __le32 __iomem *src;
- u32 size;
-
- /* TODO: when nvram is on nand flash check for bad blocks first. */
- off = FLASH_MIN;
- while (off <= len) {
- /* Windowed flash access */
- size = find_nvram_size(base + off);
- if (size) {
- header = (struct nvram_header __iomem *)
- (base + off - size);
- goto found;
- }
- off += 0x10000;
- }
-
- /* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
- header = (struct nvram_header __iomem *)(base + 4096);
- if (__raw_readl(&header->magic) == NVRAM_HEADER) {
- size = NVRAM_SPACE;
- goto found;
- }
-
- header = (struct nvram_header __iomem *)(base + 1024);
- if (__raw_readl(&header->magic) == NVRAM_HEADER) {
- size = NVRAM_SPACE;
- goto found;
- }
-
- *nvram_buf = NULL;
- *nvram_len = 0;
- pr_err("no nvram found\n");
- return -ENXIO;
-
-found:
- if (readl(&header->len) > size)
- pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n");
- *nvram_len = min_t(u32, readl(&header->len), size);
-
- *nvram_buf = devm_kzalloc(dev, *nvram_len, GFP_KERNEL);
- if (!*nvram_buf)
- return -ENOMEM;
-
- src = (__le32 __iomem *) header;
- dst = (u32 *) *nvram_buf;
- for (i = 0; i < sizeof(struct nvram_header); i += 4)
- *dst++ = __raw_readl(src++);
- for (; i < *nvram_len; i += 4)
- *dst++ = readl(src++);
-
- return 0;
-}
-
-int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len)
-{
- char *var, *value, *end, *eq;
-
- if (!name || !nvram || !nvram->nvram_len)
- return -EINVAL;
-
- /* Look for name=value and return value */
- var = nvram->nvram_buf + sizeof(struct nvram_header);
- end = nvram->nvram_buf + nvram->nvram_len - 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(bcm47xx_nvram_getenv);
-
-int bcm47xx_nvram_gpio_pin(const char *name)
-{
- int i, err;
- char nvram_var[10];
- char buf[30];
-
- for (i = 0; i < 32; i++) {
- err = snprintf(nvram_var, sizeof(nvram_var), "gpio%i", i);
- if (err <= 0)
- continue;
- err = bcm47xx_nvram_getenv(nvram_var, buf, sizeof(buf));
- if (err <= 0)
- continue;
- if (!strcmp(name, buf))
- return i;
- }
- return -ENOENT;
-}
-EXPORT_SYMBOL(bcm47xx_nvram_gpio_pin);
-
-static int bcm47xx_nvram_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct device_node *np = dev->of_node;
- int err;
- struct resource flash_mem;
- void __iomem *mmio;
-
- /* Alloc */
- nvram = devm_kzalloc(dev, sizeof(*nvram), GFP_KERNEL);
- if (!nvram)
- return -ENOMEM;
-
- err = of_address_to_resource(np, 0, &flash_mem);
- if (err)
- return err;
-
- mmio = ioremap_nocache(flash_mem.start, resource_size(&flash_mem));
- if (!mmio)
- return -ENOMEM;
-
- err = nvram_find_and_copy(dev, mmio, resource_size(&flash_mem),
- &nvram->nvram_buf, &nvram->nvram_len);
- if (err)
- goto err_unmap_mmio;
-
-err_unmap_mmio:
- iounmap(mmio);
- return err;
-}
-
-static const struct of_device_id bcm47xx_nvram_of_match_table[] = {
- { .compatible = "brcm,bcm47xx-nvram", },
- {},
-};
-MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table);
-
-static struct platform_driver bcm47xx_nvram_driver = {
- .driver = {
- .owner = THIS_MODULE,
- .name = "bcm47xx-nvram",
- .of_match_table = bcm47xx_nvram_of_match_table,
- /* driver unloading/unbinding currently not supported */
- .suppress_bind_attrs = true,
- },
- .probe = bcm47xx_nvram_probe,
-};
-module_platform_driver(bcm47xx_nvram_driver);
-
-MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>");
-MODULE_LICENSE("GPLv2");
diff --git a/target/linux/bcm53xx/files/include/linux/bcm47xx_nvram.h b/target/linux/bcm53xx/files/include/linux/bcm47xx_nvram.h
index 82890be7c4..0e52a92e84 100644
--- a/target/linux/bcm53xx/files/include/linux/bcm47xx_nvram.h
+++ b/target/linux/bcm53xx/files/include/linux/bcm47xx_nvram.h
@@ -1,8 +1,4 @@
/*
- * Copyright (C) 2005, Broadcom Corporation
- * Copyright (C) 2006, Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2014 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
@@ -15,20 +11,24 @@
#include <linux/types.h>
#include <linux/kernel.h>
-#ifdef CONFIG_BCM47XX
+#ifdef CONFIG_BCM47XX_NVRAM
+int bcm47xx_nvram_init_from_mem(u32 base, u32 lim);
int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len);
-
int bcm47xx_nvram_gpio_pin(const char *name);
#else
+static inline int bcm47xx_nvram_init_from_mem(u32 base, u32 lim)
+{
+ return -ENOTSUPP;
+};
static inline int bcm47xx_nvram_getenv(const char *name, char *val,
size_t val_len)
{
- return -ENXIO;
-}
-
+ return -ENOTSUPP;
+};
static inline int bcm47xx_nvram_gpio_pin(const char *name)
{
- return -ENXIO;
-}
+ return -ENOTSUPP;
+};
#endif
+
#endif /* __BCM47XX_NVRAM_H */