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147 lines
3.8 KiB
Diff
147 lines
3.8 KiB
Diff
From 6e977eaa8280e957b87904b536661550f2a6b3e8 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Fri, 25 Feb 2022 17:58:20 +0000
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Subject: [PATCH] nvmem: brcm_nvram: parse NVRAM content into NVMEM cells
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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NVRAM consist of header and NUL separated key-value pairs. Parse it and
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create NVMEM cell for every key-value entry.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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Link: https://lore.kernel.org/r/20220225175822.8293-3-srinivas.kandagatla@linaro.org
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/nvmem/brcm_nvram.c | 90 ++++++++++++++++++++++++++++++++++++++
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1 file changed, 90 insertions(+)
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--- a/drivers/nvmem/brcm_nvram.c
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+++ b/drivers/nvmem/brcm_nvram.c
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@@ -6,12 +6,26 @@
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#include <linux/io.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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+#include <linux/nvmem-consumer.h>
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#include <linux/nvmem-provider.h>
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#include <linux/platform_device.h>
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+#include <linux/slab.h>
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+
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+#define NVRAM_MAGIC "FLSH"
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struct brcm_nvram {
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struct device *dev;
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void __iomem *base;
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+ struct nvmem_cell_info *cells;
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+ int ncells;
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+};
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+
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+struct brcm_nvram_header {
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+ char magic[4];
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+ __le32 len;
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+ __le32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
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+ __le32 config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */
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+ __le32 config_ncdl; /* ncdl values for memc */
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};
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static int brcm_nvram_read(void *context, unsigned int offset, void *val,
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@@ -26,6 +40,75 @@ static int brcm_nvram_read(void *context
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return 0;
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}
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+static int brcm_nvram_add_cells(struct brcm_nvram *priv, uint8_t *data,
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+ size_t len)
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+{
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+ struct device *dev = priv->dev;
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+ char *var, *value, *eq;
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+ int idx;
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+
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+ priv->ncells = 0;
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+ for (var = data + sizeof(struct brcm_nvram_header);
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+ var < (char *)data + len && *var;
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+ var += strlen(var) + 1) {
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+ priv->ncells++;
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+ }
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+
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+ priv->cells = devm_kcalloc(dev, priv->ncells, sizeof(*priv->cells), GFP_KERNEL);
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+ if (!priv->cells)
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+ return -ENOMEM;
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+
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+ for (var = data + sizeof(struct brcm_nvram_header), idx = 0;
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+ var < (char *)data + len && *var;
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+ var = value + strlen(value) + 1, idx++) {
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+ eq = strchr(var, '=');
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+ if (!eq)
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+ break;
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+ *eq = '\0';
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+ value = eq + 1;
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+
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+ priv->cells[idx].name = devm_kstrdup(dev, var, GFP_KERNEL);
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+ if (!priv->cells[idx].name)
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+ return -ENOMEM;
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+ priv->cells[idx].offset = value - (char *)data;
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+ priv->cells[idx].bytes = strlen(value);
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+ }
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+
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+ return 0;
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+}
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+
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+static int brcm_nvram_parse(struct brcm_nvram *priv)
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+{
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+ struct device *dev = priv->dev;
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+ struct brcm_nvram_header header;
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+ uint8_t *data;
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+ size_t len;
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+ int err;
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+
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+ memcpy_fromio(&header, priv->base, sizeof(header));
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+
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+ if (memcmp(header.magic, NVRAM_MAGIC, 4)) {
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+ dev_err(dev, "Invalid NVRAM magic\n");
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+ return -EINVAL;
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+ }
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+
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+ len = le32_to_cpu(header.len);
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+
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+ data = kcalloc(1, len, GFP_KERNEL);
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+ memcpy_fromio(data, priv->base, len);
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+ data[len - 1] = '\0';
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+
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+ err = brcm_nvram_add_cells(priv, data, len);
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+ if (err) {
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+ dev_err(dev, "Failed to add cells: %d\n", err);
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+ return err;
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+ }
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+
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+ kfree(data);
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+
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+ return 0;
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+}
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+
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static int brcm_nvram_probe(struct platform_device *pdev)
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{
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struct nvmem_config config = {
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@@ -35,6 +118,7 @@ static int brcm_nvram_probe(struct platf
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct brcm_nvram *priv;
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+ int err;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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@@ -46,7 +130,13 @@ static int brcm_nvram_probe(struct platf
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if (IS_ERR(priv->base))
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return PTR_ERR(priv->base);
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+ err = brcm_nvram_parse(priv);
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+ if (err)
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+ return err;
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+
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config.dev = dev;
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+ config.cells = priv->cells;
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+ config.ncells = priv->ncells;
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config.priv = priv;
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config.size = resource_size(res);
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