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 Signed-off-by: Weijie Gao weijie.gao@mediatek.com --- v3 changes: none v2 changes: none --- drivers/timer/mtk_timer.c | 59 ++++++++++++++++++++++++--------------- 1 file changed, 37 insertions(+), 22 deletions(-)
diff --git a/drivers/timer/mtk_timer.c b/drivers/timer/mtk_timer.c index f6b97f868c..223e63f6c1 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 @@ static int mtk_timer_probe(struct udevice *dev) 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 @@ static int mtk_timer_probe(struct udevice *dev) 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 timer_ops mtk_timer_ops = { };
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 }, { } };