timer: mtk: add support for MediaTek MT7981/MT7986 SoCs
This patch add general-purpose timer support for MediaTek MT7981/MT7986.
These two SoCs uses a newer version of timer with its register definition
slightly changed.
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Daniel Golle <daniel@makrotopia.org>
diff --git a/drivers/timer/mtk_timer.c b/drivers/timer/mtk_timer.c
index f6b97f8..223e63f 100644
--- a/drivers/timer/mtk_timer.c
+++ b/drivers/timer/mtk_timer.c
@@ -13,24 +13,32 @@
#include <asm/io.h>
#include <linux/bitops.h>
-#define MTK_GPT4_CTRL 0x40
-#define MTK_GPT4_CLK 0x44
-#define MTK_GPT4_CNT 0x48
+#define MTK_GPT4_OFFSET_V1 0x40
+#define MTK_GPT4_OFFSET_V2 0x80
-#define GPT4_ENABLE BIT(0)
-#define GPT4_CLEAR BIT(1)
-#define GPT4_FREERUN GENMASK(5, 4)
-#define GPT4_CLK_SYS 0x0
-#define GPT4_CLK_DIV1 0x0
+#define MTK_GPT_CON 0x0
+#define MTK_GPT_V1_CLK 0x4
+#define MTK_GPT_CNT 0x8
+
+#define GPT_ENABLE BIT(0)
+#define GPT_CLEAR BIT(1)
+#define GPT_V1_FREERUN GENMASK(5, 4)
+#define GPT_V2_FREERUN GENMASK(6, 5)
+
+enum mtk_gpt_ver {
+ MTK_GPT_V1,
+ MTK_GPT_V2
+};
struct mtk_timer_priv {
void __iomem *base;
+ unsigned int gpt4_offset;
};
static u64 mtk_timer_get_count(struct udevice *dev)
{
struct mtk_timer_priv *priv = dev_get_priv(dev);
- u32 val = readl(priv->base + MTK_GPT4_CNT);
+ u32 val = readl(priv->base + priv->gpt4_offset + MTK_GPT_CNT);
return timer_conv_64(val);
}
@@ -40,12 +48,27 @@
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct mtk_timer_priv *priv = dev_get_priv(dev);
struct clk clk, parent;
- int ret;
+ int ret, gpt_ver;
priv->base = dev_read_addr_ptr(dev);
+ gpt_ver = dev_get_driver_data(dev);
+
if (!priv->base)
return -ENOENT;
+ if (gpt_ver == MTK_GPT_V2) {
+ priv->gpt4_offset = MTK_GPT4_OFFSET_V2;
+
+ writel(GPT_V2_FREERUN | GPT_CLEAR | GPT_ENABLE,
+ priv->base + priv->gpt4_offset + MTK_GPT_CON);
+ } else {
+ priv->gpt4_offset = MTK_GPT4_OFFSET_V1;
+
+ writel(GPT_V1_FREERUN | GPT_CLEAR | GPT_ENABLE,
+ priv->base + priv->gpt4_offset + MTK_GPT_CON);
+ writel(0, priv->base + priv->gpt4_offset + MTK_GPT_V1_CLK);
+ }
+
ret = clk_get_by_index(dev, 0, &clk);
if (ret)
return ret;
@@ -61,16 +84,6 @@
if (!uc_priv->clock_rate)
return -EINVAL;
- /*
- * Initialize the timer:
- * 1. set clock source to system clock with clock divider setting to 1
- * 2. set timer mode to free running
- * 3. reset timer counter to 0 then enable the timer
- */
- writel(GPT4_CLK_SYS | GPT4_CLK_DIV1, priv->base + MTK_GPT4_CLK);
- writel(GPT4_FREERUN | GPT4_CLEAR | GPT4_ENABLE,
- priv->base + MTK_GPT4_CTRL);
-
return 0;
}
@@ -79,8 +92,10 @@
};
static const struct udevice_id mtk_timer_ids[] = {
- { .compatible = "mediatek,timer" },
- { .compatible = "mediatek,mt6577-timer" },
+ { .compatible = "mediatek,timer", .data = MTK_GPT_V1 },
+ { .compatible = "mediatek,mt6577-timer", .data = MTK_GPT_V1 },
+ { .compatible = "mediatek,mt7981-timer", .data = MTK_GPT_V2 },
+ { .compatible = "mediatek,mt7986-timer", .data = MTK_GPT_V2 },
{ }
};