bcm53xx: move NVRAM driver to the target files

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43603 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 215 insertions, 0 deletions

diff --git a/target/linux/bcm53xx/files/drivers/misc/bcm47xx-nvram.c b/target/linux/bcm53xx/files/drivers/misc/bcm47xx-nvram.c
new file mode 100644
index 0000000000..6ea715c2cd
--- /dev/null
+++ b/target/linux/bcm53xx/files/drivers/misc/bcm47xx-nvram.c
@@ -0,0 +1,215 @@
+/*
+ * 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>
+
+struct bcm47xx_nvram {
+	size_t nvram_len;
+	char *nvram_buf;
+};
+
+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 struct device *dev, const char *name, char *val,
+			 size_t val_len)
+{
+	char *var, *value, *end, *eq;
+	struct bcm47xx_nvram *nvram;
+
+	if (!dev)
+		return -ENODEV;
+
+	nvram = dev_get_drvdata(dev);
+
+	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 struct device *dev, const char *name)
+{
+	int i, err;
+	char nvram_var[10];
+	char buf[30];
+
+	if (!dev)
+		return -ENODEV;
+
+	for (i = 0; i < 32; i++) {
+		err = snprintf(nvram_var, sizeof(nvram_var), "gpio%i", i);
+		if (err <= 0)
+			continue;
+		err = bcm47xx_nvram_getenv(dev, 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;
+	struct bcm47xx_nvram *nvram;
+	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;
+
+	platform_set_drvdata(pdev, nvram);
+
+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");