bcm53xx: update NVMEM driver for NVRAM

Include support for NVMEM cells.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 2f50c53f1772f24e4687e960e21c5b392fb522f0)

4 files changed, 230 insertions, 5 deletions

diff --git a/target/linux/bcm53xx/patches-5.4/081-v5.18-nvmem-brcm_nvram-parse-NVRAM-content-into-NVMEM-cell.patch b/target/linux/bcm53xx/patches-5.4/081-v5.18-nvmem-brcm_nvram-parse-NVRAM-content-into-NVMEM-cell.patch
new file mode 100644
index 0000000000..99781b3a7b
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.4/081-v5.18-nvmem-brcm_nvram-parse-NVRAM-content-into-NVMEM-cell.patch
@@ -0,0 +1,146 @@
+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);
+ 
diff --git a/target/linux/bcm53xx/patches-5.4/082-v5.19-nvmem-brcm_nvram-find-Device-Tree-nodes-for-NVMEM-ce.patch b/target/linux/bcm53xx/patches-5.4/082-v5.19-nvmem-brcm_nvram-find-Device-Tree-nodes-for-NVMEM-ce.patch
new file mode 100644
index 0000000000..a9eacd9419
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.4/082-v5.19-nvmem-brcm_nvram-find-Device-Tree-nodes-for-NVMEM-ce.patch
@@ -0,0 +1,38 @@
+From 207775f7e17b8fd0426a2ac4a5b81e4e1d71849e Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Fri, 29 Apr 2022 17:26:47 +0100
+Subject: [PATCH] nvmem: brcm_nvram: find Device Tree nodes for NVMEM cells
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+DT binding for Broadcom's NVRAM supports specifying NVMEM cells as NVMEM
+device (provider) subnodes. Look for such subnodes when collecing NVMEM
+cells. This allows NVMEM consumers to use NVRAM variables.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+Link: https://lore.kernel.org/r/20220429162701.2222-3-srinivas.kandagatla@linaro.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/nvmem/brcm_nvram.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/nvmem/brcm_nvram.c
++++ b/drivers/nvmem/brcm_nvram.c
+@@ -8,6 +8,7 @@
+ #include <linux/module.h>
+ #include <linux/nvmem-consumer.h>
+ #include <linux/nvmem-provider.h>
++#include <linux/of.h>
+ #include <linux/platform_device.h>
+ #include <linux/slab.h>
+ 
+@@ -72,6 +73,7 @@ static int brcm_nvram_add_cells(struct b
+ 			return -ENOMEM;
+ 		priv->cells[idx].offset = value - (char *)data;
+ 		priv->cells[idx].bytes = strlen(value);
++		priv->cells[idx].np = of_get_child_by_name(dev->of_node, priv->cells[idx].name);
+ 	}
+ 
+ 	return 0;
diff --git a/target/linux/bcm53xx/patches-5.4/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch b/target/linux/bcm53xx/patches-5.4/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch
index cf5952ad5f..ecc5f3974e 100644
--- a/target/linux/bcm53xx/patches-5.4/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch
+++ b/target/linux/bcm53xx/patches-5.4/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch
@@ -20,12 +20,12 @@ Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  #include <linux/io.h>
  #include <linux/mod_devicetable.h>
  #include <linux/module.h>
-@@ -46,6 +47,8 @@ static int brcm_nvram_probe(struct platf
- 	if (IS_ERR(priv->base))
- 		return PTR_ERR(priv->base);
+@@ -136,6 +137,8 @@ static int brcm_nvram_probe(struct platf
+ 	if (err)
+ 		return err;
  
 +	bcm47xx_nvram_init_from_iomem(priv->base, resource_size(res));
 +
  	config.dev = dev;
- 	config.priv = priv;
- 	config.size = resource_size(res);
+ 	config.cells = priv->cells;
+ 	config.ncells = priv->ncells;
diff --git a/target/linux/generic/backport-5.4/802-v5.19-nvmem-core-support-passing-DT-node-in-cell-info.patch b/target/linux/generic/backport-5.4/802-v5.19-nvmem-core-support-passing-DT-node-in-cell-info.patch
new file mode 100644
index 0000000000..c6da49ef88
--- /dev/null
+++ b/target/linux/generic/backport-5.4/802-v5.19-nvmem-core-support-passing-DT-node-in-cell-info.patch
@@ -0,0 +1,41 @@
+From dbc2f62061c6bfba0aee93161ee3194dcee84bd0 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Fri, 29 Apr 2022 17:26:46 +0100
+Subject: [PATCH] nvmem: core: support passing DT node in cell info
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Some hardware may have NVMEM cells described in Device Tree using
+individual nodes. Let drivers pass such nodes to the NVMEM subsystem so
+they can be later used by NVMEM consumers.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+Link: https://lore.kernel.org/r/20220429162701.2222-2-srinivas.kandagatla@linaro.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/nvmem/core.c           | 1 +
+ include/linux/nvmem-consumer.h | 1 +
+ 2 files changed, 2 insertions(+)
+
+--- a/drivers/nvmem/core.c
++++ b/drivers/nvmem/core.c
+@@ -141,6 +141,7 @@ static int nvmem_cell_info_to_nvmem_cell
+ 
+ 	cell->bit_offset = info->bit_offset;
+ 	cell->nbits = info->nbits;
++	cell->np = info->np;
+ 
+ 	if (cell->nbits)
+ 		cell->bytes = DIV_ROUND_UP(cell->nbits + cell->bit_offset,
+--- a/include/linux/nvmem-consumer.h
++++ b/include/linux/nvmem-consumer.h
+@@ -25,6 +25,7 @@ struct nvmem_cell_info {
+ 	unsigned int		bytes;
+ 	unsigned int		bit_offset;
+ 	unsigned int		nbits;
++	struct device_node	*np;
+ };
+ 
+ /**