diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-5.4/181-0002-firmware-bcm47xx_nvram-support-platform-device-brcm-.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-5.4/181-0002-firmware-bcm47xx_nvram-support-platform-device-brcm-.patch | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-5.4/181-0002-firmware-bcm47xx_nvram-support-platform-device-brcm-.patch b/target/linux/bcm53xx/patches-5.4/181-0002-firmware-bcm47xx_nvram-support-platform-device-brcm-.patch new file mode 100644 index 0000000000..c1dea1f26b --- /dev/null +++ b/target/linux/bcm53xx/patches-5.4/181-0002-firmware-bcm47xx_nvram-support-platform-device-brcm-.patch @@ -0,0 +1,85 @@ +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> +Date: Tue, 2 Mar 2021 08:33:13 +0100 +Subject: [PATCH] firmware: bcm47xx_nvram: support platform device "brcm,nvram" + +Add support for platform device providing mapping resource. This allows +reading NVRAM based on DT mapping binding. It's required for devices +that boot depending on NVRAM stored setup and provides early access to +NVRAM data. + +Signed-off-by: Rafał Miłecki <rafal@milecki.pl> +--- + drivers/firmware/broadcom/bcm47xx_nvram.c | 55 +++++++++++++++++++++++ + 1 file changed, 55 insertions(+) + +--- a/drivers/firmware/broadcom/bcm47xx_nvram.c ++++ b/drivers/firmware/broadcom/bcm47xx_nvram.c +@@ -13,6 +13,7 @@ + #include <linux/kernel.h> + #include <linux/string.h> + #include <linux/mtd/mtd.h> ++#include <linux/platform_device.h> + #include <linux/bcm47xx_nvram.h> + + #define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */ +@@ -162,6 +163,60 @@ static int nvram_init(void) + return -ENXIO; + } + ++static int brcm_nvram_probe(struct platform_device *pdev) ++{ ++ struct nvram_header __iomem *header; ++ struct device *dev = &pdev->dev; ++ struct resource *res; ++ void __iomem *mmio; ++ size_t copy_len; ++ ++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ if (!res) { ++ dev_err(dev, "Failed to get resource\n"); ++ return -ENODEV; ++ } ++ ++ mmio = ioremap(res->start, resource_size(res)); ++ if (!mmio) ++ return -ENOMEM; ++ ++ header = (struct nvram_header *)mmio; ++ copy_len = DIV_ROUND_UP(sizeof(*header) + header->len, 4); ++ if (header->magic != NVRAM_MAGIC) { ++ dev_err(dev, "No NVRAM found at %pR\n", res); ++ return -EPROTO; ++ } else if (copy_len > resource_size(res)) { ++ dev_err(dev, "NVRAM size exceeds %pR\n", res); ++ return -ERANGE; ++ } else if (copy_len >= NVRAM_SPACE) { ++ dev_err(dev, "NVRAM size exceeds buffer size %d\n", NVRAM_SPACE); ++ return -ENOMEM; ++ } ++ ++ __ioread32_copy(nvram_buf, mmio, copy_len); ++ nvram_buf[NVRAM_SPACE - 1] = '\0'; ++ ++ iounmap(mmio); ++ ++ return 0; ++} ++ ++static const struct of_device_id brcm_nvram_of_match[] = { ++ { .compatible = "brcm,nvram "}, ++ {}, ++}; ++ ++static struct platform_driver brcm_nvram_driver = { ++ .driver = { ++ .name = "brcm_nvram", ++ .of_match_table = brcm_nvram_of_match, ++ }, ++ .probe = brcm_nvram_probe, ++}; ++ ++module_platform_driver(brcm_nvram_driver); ++ + int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len) + { + char *var, *value, *end, *eq; |