bcm53xx: move NVRAM driver to the target files
Signed-off-by: Rafał Miłecki <zajec5@gmail.com> SVN-Revision: 43603v19.07.3_mercusys_ac12_duma
Rafał Miłecki
10 years ago
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3fab0d818c
commit
27a91a99d9
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/*
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* BCM947xx nvram variable access
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*
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* Copyright (C) 2005 Broadcom Corporation
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* Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2010-2014 Hauke Mehrtens <hauke@hauke-m.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/of_address.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/bcm47xx_nvram.h>
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struct bcm47xx_nvram {
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size_t nvram_len;
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char *nvram_buf;
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};
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static const u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000};
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static u32 find_nvram_size(void __iomem *end)
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{
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struct nvram_header __iomem *header;
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int i;
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for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) {
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header = (struct nvram_header __iomem *)(end - nvram_sizes[i]);
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if (__raw_readl(&header->magic) == NVRAM_HEADER)
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return nvram_sizes[i];
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}
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return 0;
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}
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/* Probe for NVRAM header */
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static int nvram_find_and_copy(struct device *dev, void __iomem *base,
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size_t len, char **nvram_buf,
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size_t *nvram_len)
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{
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struct nvram_header __iomem *header;
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int i;
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u32 off;
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u32 *dst;
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__le32 __iomem *src;
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u32 size;
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/* TODO: when nvram is on nand flash check for bad blocks first. */
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off = FLASH_MIN;
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while (off <= len) {
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/* Windowed flash access */
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size = find_nvram_size(base + off);
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if (size) {
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header = (struct nvram_header __iomem *)
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(base + off - size);
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goto found;
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}
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off += 0x10000;
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}
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/* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
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header = (struct nvram_header __iomem *)(base + 4096);
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if (__raw_readl(&header->magic) == NVRAM_HEADER) {
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size = NVRAM_SPACE;
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goto found;
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}
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header = (struct nvram_header __iomem *)(base + 1024);
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if (__raw_readl(&header->magic) == NVRAM_HEADER) {
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size = NVRAM_SPACE;
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goto found;
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}
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*nvram_buf = NULL;
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*nvram_len = 0;
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pr_err("no nvram found\n");
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return -ENXIO;
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found:
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if (readl(&header->len) > size)
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pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n");
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*nvram_len = min_t(u32, readl(&header->len), size);
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*nvram_buf = devm_kzalloc(dev, *nvram_len, GFP_KERNEL);
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if (!*nvram_buf)
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return -ENOMEM;
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src = (__le32 __iomem *) header;
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dst = (u32 *) *nvram_buf;
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for (i = 0; i < sizeof(struct nvram_header); i += 4)
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*dst++ = __raw_readl(src++);
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for (; i < *nvram_len; i += 4)
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*dst++ = readl(src++);
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return 0;
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}
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int bcm47xx_nvram_getenv(const struct device *dev, const char *name, char *val,
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size_t val_len)
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{
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char *var, *value, *end, *eq;
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struct bcm47xx_nvram *nvram;
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if (!dev)
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return -ENODEV;
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nvram = dev_get_drvdata(dev);
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if (!name || !nvram || !nvram->nvram_len)
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return -EINVAL;
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/* Look for name=value and return value */
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var = nvram->nvram_buf + sizeof(struct nvram_header);
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end = nvram->nvram_buf + nvram->nvram_len - 2;
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end[0] = end[1] = '\0';
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for (; *var; var = value + strlen(value) + 1) {
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eq = strchr(var, '=');
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if (!eq)
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break;
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value = eq + 1;
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if ((eq - var) == strlen(name) &&
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strncmp(var, name, (eq - var)) == 0) {
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return snprintf(val, val_len, "%s", value);
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}
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}
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return -ENOENT;
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}
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EXPORT_SYMBOL(bcm47xx_nvram_getenv);
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int bcm47xx_nvram_gpio_pin(const struct device *dev, const char *name)
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{
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int i, err;
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char nvram_var[10];
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char buf[30];
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if (!dev)
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return -ENODEV;
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for (i = 0; i < 32; i++) {
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err = snprintf(nvram_var, sizeof(nvram_var), "gpio%i", i);
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if (err <= 0)
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continue;
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err = bcm47xx_nvram_getenv(dev, nvram_var, buf, sizeof(buf));
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if (err <= 0)
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continue;
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if (!strcmp(name, buf))
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return i;
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}
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return -ENOENT;
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}
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EXPORT_SYMBOL(bcm47xx_nvram_gpio_pin);
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static int bcm47xx_nvram_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct bcm47xx_nvram *nvram;
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int err;
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struct resource flash_mem;
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void __iomem *mmio;
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/* Alloc */
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nvram = devm_kzalloc(dev, sizeof(*nvram), GFP_KERNEL);
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if (!nvram)
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return -ENOMEM;
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err = of_address_to_resource(np, 0, &flash_mem);
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if (err)
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return err;
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mmio = ioremap_nocache(flash_mem.start, resource_size(&flash_mem));
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if (!mmio)
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return -ENOMEM;
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err = nvram_find_and_copy(dev, mmio, resource_size(&flash_mem),
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&nvram->nvram_buf, &nvram->nvram_len);
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if (err)
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goto err_unmap_mmio;
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platform_set_drvdata(pdev, nvram);
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err_unmap_mmio:
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iounmap(mmio);
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return err;
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}
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static const struct of_device_id bcm47xx_nvram_of_match_table[] = {
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{ .compatible = "brcm,bcm47xx-nvram", },
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{},
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};
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MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table);
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static struct platform_driver bcm47xx_nvram_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "bcm47xx-nvram",
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.of_match_table = bcm47xx_nvram_of_match_table,
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/* driver unloading/unbinding currently not supported */
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.suppress_bind_attrs = true,
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},
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.probe = bcm47xx_nvram_probe,
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};
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module_platform_driver(bcm47xx_nvram_driver);
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MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>");
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MODULE_LICENSE("GPLv2");
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