android: persistent_ram: Allow specifying ecc parameters in platform data

Change-Id: If5aaa968f6ce85ac8e18f07cca286f20f0aa6e58
Signed-off-by: Arve Hjønnevåg <[email protected]>

Author: arve-android

drivers/staging/android/persistent_ram.c

@@ -190,7 +190,7 @@ static void persistent_ram_ecc_old(struct persistent_ram_zone *prz)
 }
 
 static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
-	size_t buffer_size)
+	size_t buffer_size, struct persistent_ram *ram)
 {
 	int numerr;
 	struct persistent_ram_buffer *buffer = prz->buffer;
@@ -199,10 +199,10 @@ static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
 	if (!prz->ecc)
 		return 0;
 
-	prz->ecc_block_size = 128;
-	prz->ecc_size = 16;
-	prz->ecc_symsize = 8;
-	prz->ecc_poly = 0x11d;
+	prz->ecc_block_size = ram->ecc_block_size ?: 128;
+	prz->ecc_size = ram->ecc_size ?: 16;
+	prz->ecc_symsize = ram->ecc_symsize ?: 8;
+	prz->ecc_poly = ram->ecc_poly ?: 0x11d;
 
 	ecc_blocks = DIV_ROUND_UP(prz->buffer_size - prz->ecc_size,
 				  prz->ecc_block_size + prz->ecc_size);
@@ -375,7 +375,7 @@ static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
 }
 
 static int __devinit persistent_ram_buffer_init(const char *name,
-		struct persistent_ram_zone *prz)
+		struct persistent_ram_zone *prz, struct persistent_ram **ramp)
 {
 	int i;
 	struct persistent_ram *ram;
@@ -386,9 +386,11 @@ static int __devinit persistent_ram_buffer_init(const char *name,
 		start = ram->start;
 		for (i = 0; i < ram->num_descs; i++) {
 			desc = &ram->descs[i];
-			if (!strcmp(desc->name, name))
+			if (!strcmp(desc->name, name)) {
+				*ramp = ram;
 				return persistent_ram_buffer_map(start,
 						desc->size, prz);
+			}
 			start += desc->size;
 		}
 	}
@@ -399,6 +401,7 @@ static int __devinit persistent_ram_buffer_init(const char *name,
 static  __devinit
 struct persistent_ram_zone *__persistent_ram_init(struct device *dev, bool ecc)
 {
+	struct persistent_ram *ram;
 	struct persistent_ram_zone *prz;
 	int ret = -ENOMEM;
 
@@ -410,14 +413,14 @@ struct persistent_ram_zone *__persistent_ram_init(struct device *dev, bool ecc)
 
 	INIT_LIST_HEAD(&prz->node);
 
-	ret = persistent_ram_buffer_init(dev_name(dev), prz);
+	ret = persistent_ram_buffer_init(dev_name(dev), prz, &ram);
 	if (ret) {
 		pr_err("persistent_ram: failed to initialize buffer\n");
 		goto err;
 	}
 
 	prz->ecc = ecc;
-	ret = persistent_ram_init_ecc(prz, prz->buffer_size);
+	ret = persistent_ram_init_ecc(prz, prz->buffer_size, ram);
 	if (ret)
 		goto err;
 

include/linux/persistent_ram.h

@@ -31,6 +31,11 @@ struct persistent_ram {
 	phys_addr_t	start;
 	phys_addr_t	size;
 
+	int ecc_block_size;
+	int ecc_size;
+	int ecc_symsize;
+	int ecc_poly;
+
 	int					num_descs;
 	struct persistent_ram_descriptor	*descs;