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timer: mtk: add support for MediaTek MT7981/MT7986 SoCs

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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>
This commit is contained in:
Weijie Gao 2022-09-09 19:59:41 +08:00 committed by Tom Rini
parent 1ac479587f
commit 980e107d0f
1 changed files with 37 additions and 22 deletions
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59
drivers/timer/mtk_timer.c
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@ -13,24 +13,32 @@
#include <asm/io.h> #include <asm/io.h>
#include <linux/bitops.h> #include <linux/bitops.h>
#define MTK_GPT4_CTRL 0x40 #define MTK_GPT4_OFFSET_V1 0x40
#define MTK_GPT4_CLK 0x44 #define MTK_GPT4_OFFSET_V2 0x80
#define MTK_GPT4_CNT 0x48
#define GPT4_ENABLE BIT(0) #define MTK_GPT_CON 0x0
#define GPT4_CLEAR BIT(1) #define MTK_GPT_V1_CLK 0x4
#define GPT4_FREERUN GENMASK(5, 4) #define MTK_GPT_CNT 0x8
#define GPT4_CLK_SYS 0x0
#define GPT4_CLK_DIV1 0x0 #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 { struct mtk_timer_priv {
void __iomem *base; void __iomem *base;
unsigned int gpt4_offset;
}; };
static u64 mtk_timer_get_count(struct udevice *dev) static u64 mtk_timer_get_count(struct udevice *dev)
{ {
struct mtk_timer_priv *priv = dev_get_priv(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); 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 timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct mtk_timer_priv *priv = dev_get_priv(dev); struct mtk_timer_priv *priv = dev_get_priv(dev);
struct clk clk, parent; struct clk clk, parent;
int ret; int ret, gpt_ver;
priv->base = dev_read_addr_ptr(dev); priv->base = dev_read_addr_ptr(dev);
gpt_ver = dev_get_driver_data(dev);
if (!priv->base) if (!priv->base)
return -ENOENT; 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); ret = clk_get_by_index(dev, 0, &clk);
if (ret) if (ret)
return ret; return ret;
@ -61,16 +84,6 @@ static int mtk_timer_probe(struct udevice *dev)
if (!uc_priv->clock_rate) if (!uc_priv->clock_rate)
return -EINVAL; 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; return 0;
} }
@ -79,8 +92,10 @@ static const struct timer_ops mtk_timer_ops = {
}; };
static const struct udevice_id mtk_timer_ids[] = { static const struct udevice_id mtk_timer_ids[] = {
{ .compatible = "mediatek,timer" }, { .compatible = "mediatek,timer", .data = MTK_GPT_V1 },
{ .compatible = "mediatek,mt6577-timer" }, { .compatible = "mediatek,mt6577-timer", .data = MTK_GPT_V1 },
{ .compatible = "mediatek,mt7981-timer", .data = MTK_GPT_V2 },
{ .compatible = "mediatek,mt7986-timer", .data = MTK_GPT_V2 },
{ } { }
}; };