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Subject[PATCH v2] clk: aspeed: Support second reset register
Date
The ast2500 has an additional reset register that contains resets not
present in the ast2400. This enables support for this register, and adds
the one reset line that is controlled by it.

Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
v2:
This commit fixes a bug in aspeed_reset_assert() which determines
the second reset register using condition.

drivers/clk/clk-aspeed.c | 44 +++++++++++++++++++-----
include/dt-bindings/clock/aspeed-clock.h | 1 +
2 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/clk-aspeed.c b/drivers/clk/clk-aspeed.c
index c7cb1f2b6f8a..1fbf45738535 100644
--- a/drivers/clk/clk-aspeed.c
+++ b/drivers/clk/clk-aspeed.c
@@ -16,6 +16,8 @@

#define ASPEED_NUM_CLKS 35

+#define ASPEED_RESET2_OFFSET 32
+
#define ASPEED_RESET_CTRL 0x04
#define ASPEED_CLK_SELECTION 0x08
#define ASPEED_CLK_STOP_CTRL 0x0c
@@ -30,6 +32,7 @@
#define CLKIN_25MHZ_EN BIT(23)
#define AST2400_CLK_SOURCE_SEL BIT(18)
#define ASPEED_CLK_SELECTION_2 0xd8
+#define ASPEED_RESET_CTRL2 0xd4

/* Globally visible clocks */
static DEFINE_SPINLOCK(aspeed_clk_lock);
@@ -291,6 +294,7 @@ struct aspeed_reset {
#define to_aspeed_reset(p) container_of((p), struct aspeed_reset, rcdev)

static const u8 aspeed_resets[] = {
+ /* SCU04 resets */
[ASPEED_RESET_XDMA] = 25,
[ASPEED_RESET_MCTP] = 24,
[ASPEED_RESET_ADC] = 23,
@@ -300,38 +304,62 @@ static const u8 aspeed_resets[] = {
[ASPEED_RESET_PCIVGA] = 8,
[ASPEED_RESET_I2C] = 2,
[ASPEED_RESET_AHB] = 1,
+
+ /*
+ * SCUD4 resets start at an offset to separate them from
+ * the SCU04 resets.
+ */
+ [ASPEED_RESET_CRT1] = ASPEED_RESET2_OFFSET + 5,
};

static int aspeed_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct aspeed_reset *ar = to_aspeed_reset(rcdev);
- u32 rst = BIT(aspeed_resets[id]);
+ u32 reg = ASPEED_RESET_CTRL;
+ u32 bit = aspeed_resets[id];
+
+ if (bit >= ASPEED_RESET2_OFFSET) {
+ bit -= ASPEED_RESET2_OFFSET;
+ reg = ASPEED_RESET_CTRL2;
+ }

- return regmap_update_bits(ar->map, ASPEED_RESET_CTRL, rst, 0);
+ return regmap_update_bits(ar->map, reg, BIT(bit), 0);
}

static int aspeed_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct aspeed_reset *ar = to_aspeed_reset(rcdev);
- u32 rst = BIT(aspeed_resets[id]);
+ u32 reg = ASPEED_RESET_CTRL;
+ u32 bit = aspeed_resets[id];

- return regmap_update_bits(ar->map, ASPEED_RESET_CTRL, rst, rst);
+ if (bit >= ASPEED_RESET2_OFFSET) {
+ bit -= ASPEED_RESET2_OFFSET;
+ reg = ASPEED_RESET_CTRL2;
+ }
+
+ return regmap_update_bits(ar->map, reg, BIT(bit), BIT(bit));
}

static int aspeed_reset_status(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct aspeed_reset *ar = to_aspeed_reset(rcdev);
- u32 val, rst = BIT(aspeed_resets[id]);
- int ret;
+ u32 reg = ASPEED_RESET_CTRL;
+ u32 bit = aspeed_resets[id];
+ int ret, val;
+
+ if (bit >= ASPEED_RESET2_OFFSET) {
+ bit -= ASPEED_RESET2_OFFSET;
+ reg = ASPEED_RESET_CTRL2;
+ }

- ret = regmap_read(ar->map, ASPEED_RESET_CTRL, &val);
+ ret = regmap_read(ar->map, reg, &val);
if (ret)
return ret;

- return !!(val & rst);
+ return !!(val & BIT(bit));
}

static const struct reset_control_ops aspeed_reset_ops = {
diff --git a/include/dt-bindings/clock/aspeed-clock.h b/include/dt-bindings/clock/aspeed-clock.h
index d3558d897a4d..513c1b4af7a8 100644
--- a/include/dt-bindings/clock/aspeed-clock.h
+++ b/include/dt-bindings/clock/aspeed-clock.h
@@ -48,5 +48,6 @@
#define ASPEED_RESET_PCIVGA 6
#define ASPEED_RESET_I2C 7
#define ASPEED_RESET_AHB 8
+#define ASPEED_RESET_CRT1 9

#endif
--
2.17.0
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