drivers: soc: sunxi: add support for remapping func value to reg value

On some Allwinner SoCs, sometimes the value needed to write into the
register to claim SRAM is not equal to the value specified in the
device tree.

The device tree binding defines 0 as "mapped to CPU" and 1 as "mapped
to X device". This matches the value written to the configuration
register for the SRAM blocks currently supported. However, the not yet
supported VE SRAM block is claimed for the device by writing 0x7fffffff,
which is vastly different from the other blocks. On the A64, SRAM C is
claimed by the device by writing a 0, which is the opposite of the
current design.

Add a value remapping in sunxi_sram_func structure, and let the
sunxi_sram_of_parse function set the remapped register value.
This allows us to keep the convention currently used in the device tree
binding.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
[wens@csie.org: Clarified commit message]
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

drivers/soc/sunxi/sunxi_sram.c

@@ -23,6 +23,7 @@
 struct sunxi_sram_func {
 	char	*func;
 	u8	val;
+	u32	reg_val;
 };
 
 struct sunxi_sram_data {
@@ -39,10 +40,11 @@ struct sunxi_sram_desc {
 	bool			claimed;
 };
 
-#define SUNXI_SRAM_MAP(_val, _func)				\
+#define SUNXI_SRAM_MAP(_reg_val, _val, _func)			\
 	{							\
 		.func = _func,					\
 		.val = _val,					\
+		.reg_val = _reg_val,				\
 	}
 
 #define SUNXI_SRAM_DATA(_name, _reg, _off, _width, ...)		\
@@ -57,14 +59,14 @@ struct sunxi_sram_desc {
 
 static struct sunxi_sram_desc sun4i_a10_sram_a3_a4 = {
 	.data	= SUNXI_SRAM_DATA("A3-A4", 0x4, 0x4, 2,
-				  SUNXI_SRAM_MAP(0, "cpu"),
-				  SUNXI_SRAM_MAP(1, "emac")),
+				  SUNXI_SRAM_MAP(0, 0, "cpu"),
+				  SUNXI_SRAM_MAP(1, 1, "emac")),
 };
 
 static struct sunxi_sram_desc sun4i_a10_sram_d = {
 	.data	= SUNXI_SRAM_DATA("D", 0x4, 0x0, 1,
-				  SUNXI_SRAM_MAP(0, "cpu"),
-				  SUNXI_SRAM_MAP(1, "usb-otg")),
+				  SUNXI_SRAM_MAP(0, 0, "cpu"),
+				  SUNXI_SRAM_MAP(1, 1, "usb-otg")),
 };
 
 static const struct of_device_id sunxi_sram_dt_ids[] = {
@@ -121,7 +123,8 @@ static int sunxi_sram_show(struct seq_file *s, void *data)
 
 			for (func = sram_data->func; func->func; func++) {
 				seq_printf(s, "\t\t%s%c\n", func->func,
-					   func->val == val ? '*' : ' ');
+					   func->reg_val == val ?
+					   '*' : ' ');
 			}
 		}
 
@@ -149,10 +152,13 @@ static inline struct sunxi_sram_desc *to_sram_desc(const struct sunxi_sram_data
 }
 
 static const struct sunxi_sram_data *sunxi_sram_of_parse(struct device_node *node,
-							 unsigned int *value)
+							 unsigned int *reg_value)
 {
 	const struct of_device_id *match;
+	const struct sunxi_sram_data *data;
+	struct sunxi_sram_func *func;
 	struct of_phandle_args args;
+	u8 val;
 	int ret;
 
 	ret = of_parse_phandle_with_fixed_args(node, "allwinner,sram", 1, 0,
@@ -165,8 +171,7 @@ static const struct sunxi_sram_data *sunxi_sram_of_parse(struct device_node *nod
 		goto err;
 	}
 
-	if (value)
-		*value = args.args[0];
+	val = args.args[0];
 
 	match = of_match_node(sunxi_sram_dt_ids, args.np);
 	if (!match) {
@@ -174,6 +179,26 @@ static const struct sunxi_sram_data *sunxi_sram_of_parse(struct device_node *nod
 		goto err;
 	}
 
+	data = match->data;
+	if (!data) {
+		ret = -EINVAL;
+		goto err;
+	};
+
+	for (func = data->func; func->func; func++) {
+		if (val == func->val) {
+			if (reg_value)
+				*reg_value = func->reg_val;
+
+			break;
+		}
+	}
+
+	if (!func->func) {
+		ret = -EINVAL;
+		goto err;
+	}
+
 	of_node_put(args.np);
 	return match->data;