linux-kernel - [PATCH 3/4] drivers: soc: sunxi: add support for remapping func value to reg value

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Date:   Wed,  9 Aug 2017 16:56:26 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        Icenowy Zheng <icenowy@...c.io>
Subject: [PATCH 3/4] 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.

We now defines 0 as "CPU" and 1 as "Device", however, for VE SRAM, the
register needs to be written 0x7FFFFFFF to claim it to VE, and for
Allwinner A64's SRAM C the needed register value to claim it to DE2 is
0, and the value that enables CPU's access to the SRAM is 1.

Add a value remapping in sunxi_sram_func structure, and let the
sunxi_sram_of_parse function set the remapped register value.

Signed-off-by: Icenowy Zheng <icenowy@...c.io>
---
 drivers/soc/sunxi/sunxi_sram.c | 43 +++++++++++++++++++++++++++++++++---------
 1 file changed, 34 insertions(+), 9 deletions(-)

diff --git a/drivers/soc/sunxi/sunxi_sram.c b/drivers/soc/sunxi/sunxi_sram.c
index c1ff7fa62cb4..edc993480020 100644
--- a/drivers/soc/sunxi/sunxi_sram.c
+++ b/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;
 
-- 
2.13.0