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reset/aspeed: Implement status callback

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The I2C driver shares a reset line between buses, so allow it to test
the state of the reset line before resetting it.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Ryan Chen <ryan_chen@aspeedtech.com>
This commit is contained in:
Joel Stanley 2022-06-23 14:40:37 +09:30 committed by Tom Rini
parent b45768ebfe
commit 0a8bd97f88
2 changed files with 36 additions and 0 deletions
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19
drivers/reset/reset-ast2500.c
View file

@ -48,6 +48,24 @@ static int ast2500_reset_deassert(struct reset_ctl *reset_ctl)
return 0;
}
static int ast2500_reset_status(struct reset_ctl *reset_ctl)
{
struct ast2500_reset_priv *priv = dev_get_priv(reset_ctl->dev);
struct ast2500_scu *scu = priv->scu;
int status;
debug("%s: reset_ctl->id: %lu\n", __func__, reset_ctl->id);
if (reset_ctl->id < 32)
status = BIT(reset_ctl->id) & readl(&scu->sysreset_ctrl1);
else
status = BIT(reset_ctl->id - 32) & readl(&scu->sysreset_ctrl2);
return !!status;
}
static int ast2500_reset_probe(struct udevice *dev)
{
int rc;
@ -79,6 +97,7 @@ static const struct udevice_id ast2500_reset_ids[] = {
struct reset_ops ast2500_reset_ops = {
.rst_assert = ast2500_reset_assert,
.rst_deassert = ast2500_reset_deassert,
.rst_status = ast2500_reset_status,
};
U_BOOT_DRIVER(ast2500_reset) = {

17
drivers/reset/reset-ast2600.c
View file

@ -47,6 +47,22 @@ static int ast2600_reset_deassert(struct reset_ctl *reset_ctl)
return 0;
}
static int ast2600_reset_status(struct reset_ctl *reset_ctl)
{
struct ast2600_reset_priv *priv = dev_get_priv(reset_ctl->dev);
struct ast2600_scu *scu = priv->scu;
int status;
debug("%s: reset_ctl->id: %lu\n", __func__, reset_ctl->id);
if (reset_ctl->id < 32)
status = BIT(reset_ctl->id) & readl(&scu->modrst_ctrl1);
else
status = BIT(reset_ctl->id - 32) & readl(&scu->modrst_ctrl2);
return !!status;
}
static int ast2600_reset_probe(struct udevice *dev)
{
int rc;
@ -78,6 +94,7 @@ static const struct udevice_id ast2600_reset_ids[] = {
struct reset_ops ast2600_reset_ops = {
.rst_assert = ast2600_reset_assert,
.rst_deassert = ast2600_reset_deassert,
.rst_status = ast2600_reset_status,
};
U_BOOT_DRIVER(ast2600_reset) = {