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reset: add support for Amlogic A1 family

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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>
This commit is contained in:
Alexey Romanov 2023-10-05 11:54:23 +03:00 committed by Neil Armstrong
parent 1cff5bf0c3
commit cffe312bd7
1 changed files with 36 additions and 6 deletions
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42
drivers/reset/reset-meson.c
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@ -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);
}