mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-26 00:41:17 +00:00
bcd76dc7d8
This stops NVMEM driver from using MMIO access past booting and messing with NAND controller state. Link: https://forum.openwrt.org/t/asus-rt-ac88u-hw-a6-broken-in-22-03-3/147882 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
129 lines
3.2 KiB
Diff
129 lines
3.2 KiB
Diff
From a18378409fee1cac0f0c58a4770ff557b498c778 Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
|
|
Date: Fri, 1 Sep 2023 10:44:26 +0200
|
|
Subject: [PATCH] nvmem: brcm_nvram: store a copy of NVRAM content
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
|
|
---
|
|
drivers/nvmem/brcm_nvram.c | 54 +++++++++++++++++++-------------------
|
|
1 file changed, 27 insertions(+), 27 deletions(-)
|
|
|
|
--- a/drivers/nvmem/brcm_nvram.c
|
|
+++ b/drivers/nvmem/brcm_nvram.c
|
|
@@ -19,7 +19,7 @@
|
|
|
|
struct brcm_nvram {
|
|
struct device *dev;
|
|
- void __iomem *base;
|
|
+ uint8_t *data;
|
|
struct nvmem_cell_info *cells;
|
|
int ncells;
|
|
};
|
|
@@ -36,10 +36,8 @@ static int brcm_nvram_read(void *context
|
|
size_t bytes)
|
|
{
|
|
struct brcm_nvram *priv = context;
|
|
- u8 *dst = val;
|
|
|
|
- while (bytes--)
|
|
- *dst++ = readb(priv->base + offset++);
|
|
+ memcpy(val, priv->data + offset, bytes);
|
|
|
|
return 0;
|
|
}
|
|
@@ -110,35 +108,27 @@ static int brcm_nvram_add_cells(struct b
|
|
|
|
static int brcm_nvram_parse(struct brcm_nvram *priv)
|
|
{
|
|
+ struct brcm_nvram_header *header = (struct brcm_nvram_header *)priv->data;
|
|
struct device *dev = priv->dev;
|
|
- struct brcm_nvram_header header;
|
|
- uint8_t *data;
|
|
+ uint8_t tmp;
|
|
size_t len;
|
|
int err;
|
|
|
|
- memcpy_fromio(&header, priv->base, sizeof(header));
|
|
-
|
|
- if (memcmp(header.magic, NVRAM_MAGIC, 4)) {
|
|
+ if (memcmp(header->magic, NVRAM_MAGIC, 4)) {
|
|
dev_err(dev, "Invalid NVRAM magic\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
- len = le32_to_cpu(header.len);
|
|
+ len = le32_to_cpu(header->len);
|
|
|
|
- data = kzalloc(len, GFP_KERNEL);
|
|
- if (!data)
|
|
- return -ENOMEM;
|
|
-
|
|
- memcpy_fromio(data, priv->base, len);
|
|
- data[len - 1] = '\0';
|
|
+ tmp = priv->data[len - 1];
|
|
+ priv->data[len - 1] = '\0';
|
|
|
|
- err = brcm_nvram_add_cells(priv, data, len);
|
|
- if (err) {
|
|
+ err = brcm_nvram_add_cells(priv, priv->data, len);
|
|
+ if (err)
|
|
dev_err(dev, "Failed to add cells: %d\n", err);
|
|
- return err;
|
|
- }
|
|
|
|
- kfree(data);
|
|
+ priv->data[len - 1] = tmp;
|
|
|
|
return 0;
|
|
}
|
|
@@ -150,8 +140,10 @@ static int brcm_nvram_probe(struct platf
|
|
.reg_read = brcm_nvram_read,
|
|
};
|
|
struct device *dev = &pdev->dev;
|
|
- struct resource *res;
|
|
struct brcm_nvram *priv;
|
|
+ struct resource *res;
|
|
+ void __iomem *base;
|
|
+ size_t size;
|
|
int err;
|
|
|
|
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
|
|
@@ -159,21 +151,29 @@ static int brcm_nvram_probe(struct platf
|
|
return -ENOMEM;
|
|
priv->dev = dev;
|
|
|
|
- priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
|
|
- if (IS_ERR(priv->base))
|
|
- return PTR_ERR(priv->base);
|
|
+ base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
|
|
+ if (IS_ERR(base))
|
|
+ return PTR_ERR(base);
|
|
+
|
|
+ size = resource_size(res);
|
|
+
|
|
+ priv->data = kzalloc(size, GFP_KERNEL);
|
|
+ if (!priv->data)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ memcpy_fromio(priv->data, base, size);
|
|
|
|
err = brcm_nvram_parse(priv);
|
|
if (err)
|
|
return err;
|
|
|
|
- bcm47xx_nvram_init_from_iomem(priv->base, resource_size(res));
|
|
+ bcm47xx_nvram_init_from_iomem(base, size);
|
|
|
|
config.dev = dev;
|
|
config.cells = priv->cells;
|
|
config.ncells = priv->ncells;
|
|
config.priv = priv;
|
|
- config.size = resource_size(res);
|
|
+ config.size = size;
|
|
|
|
return PTR_ERR_OR_ZERO(devm_nvmem_register(dev, &config));
|
|
}
|