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authorRafał Miłecki <rafal@milecki.pl>2021-03-02 09:04:48 +0100
committerRafał Miłecki <rafal@milecki.pl>2021-03-02 09:07:46 +0100
commitb0376462c164344d6be9fe1568a9f13ffd8fbb16 (patch)
tree32d7c843fa2899fc02fe0d6071e1a88818740249 /target/linux
parente3ab355ddeb302ce0c002badf7f62bf1c6f7ab69 (diff)
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bcm53xx: add support for reading NVRAM based on DT mapping
This is required for devices that use NVRAM data for detecting currently used firmware partition (e.g. Linksys devices). Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Diffstat (limited to 'target/linux')
-rw-r--r--target/linux/bcm53xx/patches-5.4/181-0001-dt-bindings-firmware-add-Broadcom-s-NVRAM-memory-map.patch56
-rw-r--r--target/linux/bcm53xx/patches-5.4/181-0002-firmware-bcm47xx_nvram-support-platform-device-brcm-.patch85
2 files changed, 141 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-5.4/181-0001-dt-bindings-firmware-add-Broadcom-s-NVRAM-memory-map.patch b/target/linux/bcm53xx/patches-5.4/181-0001-dt-bindings-firmware-add-Broadcom-s-NVRAM-memory-map.patch
new file mode 100644
index 0000000000..1b0598777c
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.4/181-0001-dt-bindings-firmware-add-Broadcom-s-NVRAM-memory-map.patch
@@ -0,0 +1,56 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Tue, 2 Mar 2021 08:23:35 +0100
+Subject: [PATCH] dt-bindings: firmware: add Broadcom's NVRAM memory mapping
+
+NVRAM structure contains device data and can be accessed using MMIO.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+---
+ .../bindings/firmware/brcm,nvram.yaml | 41 +++++++++++++++++++
+ 1 file changed, 41 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/firmware/brcm,nvram.yaml
+
+--- /dev/null
++++ b/Documentation/devicetree/bindings/firmware/brcm,nvram.yaml
+@@ -0,0 +1,41 @@
++# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
++%YAML 1.2
++---
++$id: "http://devicetree.org/schemas/firmware/brcm,nvram.yaml#"
++$schema: "http://devicetree.org/meta-schemas/core.yaml#"
++
++title: Broadcom's NVRAM
++
++maintainers:
++ - Rafał Miłecki <rafal@milecki.pl>
++
++description: |
++ NVRAM is a structure containing device specific environment variables.
++ It is used for storing device configuration, booting parameters and
++ calibration data.
++
++ It's required very early in booting process and so is made available
++ using memory mapping.
++
++ NVRAM can be found on Broadcom BCM47xx MIPS, Northstar ARM Cortex-A9
++ and some more devices.
++
++properties:
++ compatible:
++ const: brcm,nvram
++
++ reg:
++ description: memory region with NVRAM data
++ maxItems: 1
++
++required:
++ - reg
++
++additionalProperties: false
++
++examples:
++ - |
++ nvram@1e000000 {
++ compatible = "brcm,nvram";
++ reg = <0x1e000000 0x10000>;
++ };
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;