reset: add support for Amlogic A1 family

This patch adds reset support for the Amlogic A1 family.
We add the structure meson_reset_drvdata, which in the future
will allow this driver to be used for other families by declaring
only the correct parameters reg_count and level_offset.

Signed-off-by: Alexey Romanov <avromanov@salutedevices.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231005085434.74755-3-avromanov@salutedevices.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

1 files changed, 36 insertions, 6 deletions

diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c
index 64bc696f137..9d0c8b354f4 100644
--- a/drivers/reset/reset-meson.c
+++ b/drivers/reset/reset-meson.c
@@ -13,18 +13,26 @@
 #include <reset-uclass.h>
 #include <regmap.h>
 #include <linux/bitops.h>
+#include <linux/delay.h>
 
-#define REG_COUNT	8
 #define BITS_PER_REG	32
-#define LEVEL_OFFSET	0x7c
+
+struct meson_reset_drvdata {
+	unsigned int reg_count;
+	unsigned int level_offset;
+};
 
 struct meson_reset_priv {
 	struct regmap *regmap;
+	struct meson_reset_drvdata *drvdata;
 };
 
 static int meson_reset_request(struct reset_ctl *reset_ctl)
 {
-	if (reset_ctl->id > (REG_COUNT * BITS_PER_REG))
+	struct meson_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+	struct meson_reset_drvdata *data = priv->drvdata;
+
+	if (reset_ctl->id > (data->reg_count * BITS_PER_REG))
 		return -EINVAL;
 
 	return 0;
@@ -33,9 +41,10 @@ static int meson_reset_request(struct reset_ctl *reset_ctl)
 static int meson_reset_level(struct reset_ctl *reset_ctl, bool assert)
 {
 	struct meson_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+	struct meson_reset_drvdata *data = priv->drvdata;
 	uint bank = reset_ctl->id / BITS_PER_REG;
 	uint offset = reset_ctl->id % BITS_PER_REG;
-	uint reg_offset = LEVEL_OFFSET + (bank << 2);
+	uint reg_offset = data->level_offset + (bank << 2);
 	uint val;
 
 	regmap_read(priv->regmap, reg_offset, &val);
@@ -64,15 +73,36 @@ struct reset_ops meson_reset_ops = {
 	.rst_deassert = meson_reset_deassert,
 };
 
+static const struct meson_reset_drvdata meson_gxbb_data = {
+	.reg_count = 8,
+	.level_offset = 0x7c,
+};
+
+static const struct meson_reset_drvdata meson_a1_data = {
+	.reg_count = 3,
+	.level_offset = 0x40,
+};
+
 static const struct udevice_id meson_reset_ids[] = {
-	{ .compatible = "amlogic,meson-gxbb-reset" },
-	{ .compatible = "amlogic,meson-axg-reset" },
+	{
+		.compatible = "amlogic,meson-gxbb-reset",
+		.data = (ulong)&meson_gxbb_data,
+	},
+	{
+		.compatible = "amlogic,meson-axg-reset",
+		.data = (ulong)&meson_gxbb_data,
+	},
+	{
+		.compatible = "amlogic,meson-a1-reset",
+		.data = (ulong)&meson_a1_data,
+	},
 	{ }
 };
 
 static int meson_reset_probe(struct udevice *dev)
 {
 	struct meson_reset_priv *priv = dev_get_priv(dev);
+	priv->drvdata = (struct meson_reset_drvdata *)dev_get_driver_data(dev);
 
 	return regmap_init_mem(dev_ofnode(dev), &priv->regmap);
 }