avr/qmk/ChibiOS - [no description]

	Commit message (Expand)	Author	Age	Files	Lines
*	Updated all STM32's demo makefiles	Rocco Marco Guglielmi	2018-03-09	1	-20/+9
*	Mass updated all demos with the new test code.	Giovanni Di Sirio	2017-10-23	1	-1/+3
*	Added unified lwIP-FATFS-USB demo.	Giovanni Di Sirio	2017-10-10	1	-0/+1
*	Added multi-target lwIP demo.	Giovanni Di Sirio	2017-10-10	1	-0/+236

From 6e977eaa8280e957b87904b536661550f2a6b3e8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> Date: Fri, 25 Feb 2022 17:58:20 +0000 Subject: [PATCH] nvmem: brcm_nvram: parse NVRAM content into NVMEM cells MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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> --- drivers/nvmem/brcm_nvram.c | 90 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) --- a/drivers/nvmem/brcm_nvram.c +++ b/drivers/nvmem/brcm_nvram.c @@ -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 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 platf 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 platf 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);