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nvmem: brcm_nvram: parse NVRAM content into NVMEM cells 

NVRAM consist of header and NUL separated key-value pairs. Parse it and
create NVMEM cell for every key-value entry.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220225175822.8293-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafał Miłecki 2022-02-25 17:58:20 +00:00 committed by Greg Kroah-Hartman
parent cd93630182
commit 6e977eaa82
1 changed files with 90 additions and 0 deletions
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90
drivers/nvmem/brcm_nvram.c
View File

@ -6,12 +6,26 @@
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/nvmem-consumer.h>
#include <linux/nvmem-provider.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#define NVRAM_MAGIC "FLSH"
struct brcm_nvram {
struct device *dev;
void __iomem *base;
struct nvmem_cell_info *cells;
int ncells;
};
struct brcm_nvram_header {
char magic[4];
__le32 len;
__le32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
__le32 config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */
__le32 config_ncdl; /* ncdl values for memc */
};
static int brcm_nvram_read(void *context, unsigned int offset, void *val,
@ -26,6 +40,75 @@ static int brcm_nvram_read(void *context, unsigned int offset, void *val,
return 0;
}
static int brcm_nvram_add_cells(struct brcm_nvram *priv, uint8_t *data,
size_t len)
{
struct device *dev = priv->dev;
char *var, *value, *eq;
int idx;
priv->ncells = 0;
for (var = data + sizeof(struct brcm_nvram_header);
var < (char *)data + len && *var;
var += strlen(var) + 1) {
priv->ncells++;
}
priv->cells = devm_kcalloc(dev, priv->ncells, sizeof(*priv->cells), GFP_KERNEL);
if (!priv->cells)
return -ENOMEM;
for (var = data + sizeof(struct brcm_nvram_header), idx = 0;
var < (char *)data + len && *var;
var = value + strlen(value) + 1, idx++) {
eq = strchr(var, '=');
if (!eq)
break;
*eq = '\0';
value = eq + 1;
priv->cells[idx].name = devm_kstrdup(dev, var, GFP_KERNEL);
if (!priv->cells[idx].name)
return -ENOMEM;
priv->cells[idx].offset = value - (char *)data;
priv->cells[idx].bytes = strlen(value);
}
return 0;
}
static int brcm_nvram_parse(struct brcm_nvram *priv)
{
struct device *dev = priv->dev;
struct brcm_nvram_header header;
uint8_t *data;
size_t len;
int err;
memcpy_fromio(&header, priv->base, sizeof(header));
if (memcmp(header.magic, NVRAM_MAGIC, 4)) {
dev_err(dev, "Invalid NVRAM magic\n");
return -EINVAL;
}
len = le32_to_cpu(header.len);
data = kcalloc(1, len, GFP_KERNEL);
memcpy_fromio(data, priv->base, len);
data[len - 1] = '\0';
err = brcm_nvram_add_cells(priv, data, len);
if (err) {
dev_err(dev, "Failed to add cells: %d\n", err);
return err;
}
kfree(data);
return 0;
}
static int brcm_nvram_probe(struct platform_device *pdev)
{
struct nvmem_config config = {
@ -35,6 +118,7 @@ static int brcm_nvram_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct resource *res;
struct brcm_nvram *priv;
int err;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@ -46,7 +130,13 @@ static int brcm_nvram_probe(struct platform_device *pdev)
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
err = brcm_nvram_parse(priv);
if (err)
return err;
config.dev = dev;
config.cells = priv->cells;
config.ncells = priv->ncells;
config.priv = priv;
config.size = resource_size(res);