Signed-off-by: caesar <caesar.wang@xxxxxxxxxxxxxx> --- drivers/pwm/pwm-rockchip.c | 108 ++++++++++++++++++++++++++++++++++++--------- 1 file changed, 88 insertions(+), 20 deletions(-) diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c index eec2145..59b0380 100644 --- a/drivers/pwm/pwm-rockchip.c +++ b/drivers/pwm/pwm-rockchip.c @@ -2,6 +2,7 @@ * PWM driver for Rockchip SoCs * * Copyright (C) 2014 Beniamino Galvani <b.galvani@xxxxxxxxx> + * Copyright (C) 2014 Caesar Wang <caesar.wang@xxxxxxxxxxxxxx> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License @@ -12,6 +13,8 @@ #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_address.h> #include <linux/platform_device.h> #include <linux/pwm.h> #include <linux/time.h> @@ -23,14 +26,37 @@ #define PWM_CTRL_TIMER_EN (1 << 0) #define PWM_CTRL_OUTPUT_EN (1 << 3) +#define RK_PRESCALER 1 #define PRESCALER 2 +#define PWM_CONTINUOUS (1 << 1) +#define PWM_DUTY_POSITIVE (1 << 3) +#define PWM_INACTIVE_NEGATIVE (0 << 4) +#define PWM_OUTPUT_LEFT (0 << 5) +#define PWM_LP_DISABLE (0 << 8) + +#define RK_PWM_ENABLE (1 << 0) + +#define VOP_PWM_CTRL 0x00 /* VOP-PWM Control Register */ +#define VOP_PWM_CNTR 0x0c + + struct rockchip_pwm_chip { struct pwm_chip chip; struct clk *clk; + const struct rockchip_pwm_data *data; void __iomem *base; }; +struct rockchip_pwm_data { + u32 duty; + u32 period; + u32 reg_cntr; + u32 reg_ctrl; + int prescaler; + u32 enable_conf; +}; + static inline struct rockchip_pwm_chip *to_rockchip_pwm_chip(struct pwm_chip *c) { return container_of(c, struct rockchip_pwm_chip, chip); @@ -52,20 +78,20 @@ static int rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, * default prescaler value for all practical clock rate values. */ div = clk_rate * period_ns; - do_div(div, PRESCALER * NSEC_PER_SEC); + do_div(div, pc->data->prescaler * NSEC_PER_SEC); period = div; div = clk_rate * duty_ns; - do_div(div, PRESCALER * NSEC_PER_SEC); + do_div(div, pc->data->prescaler * NSEC_PER_SEC); duty = div; ret = clk_enable(pc->clk); if (ret) return ret; - writel(period, pc->base + PWM_LRC); - writel(duty, pc->base + PWM_HRC); - writel(0, pc->base + PWM_CNTR); + writel(period, pc->base + pc->data->period); + writel(duty, pc->base + pc->data->duty); + writel(0, pc->base + pc->data->reg_cntr); clk_disable(pc->clk); @@ -82,9 +108,9 @@ static int rockchip_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) if (ret) return ret; - val = readl_relaxed(pc->base + PWM_CTRL); - val |= PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN; - writel_relaxed(val, pc->base + PWM_CTRL); + val = readl_relaxed(pc->base + pc->data->reg_ctrl); + val |= pc->data->enable_conf; + writel_relaxed(val, pc->base + pc->data->reg_ctrl); return 0; } @@ -94,9 +120,9 @@ static void rockchip_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip); u32 val; - val = readl_relaxed(pc->base + PWM_CTRL); - val &= ~(PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN); - writel_relaxed(val, pc->base + PWM_CTRL); + val = readl_relaxed(pc->base + pc->data->reg_ctrl); + val &= ~pc->data->enable_conf; + writel_relaxed(val, pc->base + pc->data->reg_ctrl); clk_disable(pc->clk); } @@ -108,8 +134,48 @@ static const struct pwm_ops rockchip_pwm_ops = { .owner = THIS_MODULE, }; +static struct rockchip_pwm_data pwm_data_v1 = { + .duty = PWM_HRC, + .period = PWM_LRC, + .reg_cntr = PWM_CNTR, + .reg_ctrl = PWM_CTRL, + .prescaler = PRESCALER, + .enable_conf = PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN, +}; + +static struct rockchip_pwm_data pwm_data_v2 = { + .duty = PWM_LRC, + .period = PWM_HRC, + .reg_cntr = PWM_CNTR, + .reg_ctrl = PWM_CTRL, + .prescaler = RK_PRESCALER, + .enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | RK_PWM_ENABLE | + PWM_CONTINUOUS | PWM_DUTY_POSITIVE | PWM_INACTIVE_NEGATIVE, +}; + +static struct rockchip_pwm_data pwm_data_vop = { + .duty = PWM_LRC, + .period = PWM_HRC, + .reg_cntr = VOP_PWM_CNTR, + .reg_ctrl = VOP_PWM_CTRL, + .prescaler = RK_PRESCALER, + .enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | RK_PWM_ENABLE | + PWM_CONTINUOUS | PWM_DUTY_POSITIVE | PWM_INACTIVE_NEGATIVE, +}; + +static const struct of_device_id rockchip_pwm_dt_ids[] = { + { .compatible = "rockchip,rk2928-pwm", .data = &pwm_data_v1}, + { .compatible = "rockchip,rk3288-pwm", .data = &pwm_data_v2}, + { .compatible = "rockchip,vop-pwm", .data = &pwm_data_vop}, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, rockchip_pwm_dt_ids); + static int rockchip_pwm_probe(struct platform_device *pdev) { + const struct of_device_id *of_id = + of_match_device(rockchip_pwm_dt_ids, &pdev->dev); + struct device_node *np = pdev->dev.of_node; struct rockchip_pwm_chip *pc; struct resource *r; int ret; @@ -119,9 +185,12 @@ static int rockchip_pwm_probe(struct platform_device *pdev) return -ENOMEM; r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - pc->base = devm_ioremap_resource(&pdev->dev, r); - if (IS_ERR(pc->base)) - return PTR_ERR(pc->base); + pc->base = of_iomap(np, 0); + if (!pc->base) { + dev_err(&pdev->dev, "failed to map controller\n"); + ret = -ENOMEM; + goto fail_map; + } pc->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(pc->clk)) @@ -133,6 +202,7 @@ static int rockchip_pwm_probe(struct platform_device *pdev) platform_set_drvdata(pdev, pc); + pc->data = of_id->data; pc->chip.dev = &pdev->dev; pc->chip.ops = &rockchip_pwm_ops; pc->chip.base = -1; @@ -145,6 +215,10 @@ static int rockchip_pwm_probe(struct platform_device *pdev) } return ret; + +fail_map: + iounmap(pc->base); + return ret; } static int rockchip_pwm_remove(struct platform_device *pdev) @@ -156,12 +230,6 @@ static int rockchip_pwm_remove(struct platform_device *pdev) return pwmchip_remove(&pc->chip); } -static const struct of_device_id rockchip_pwm_dt_ids[] = { - { .compatible = "rockchip,rk2928-pwm" }, - { /* sentinel */ } -}; -MODULE_DEVICE_TABLE(of, rockchip_pwm_dt_ids); - static struct platform_driver rockchip_pwm_driver = { .driver = { .name = "rockchip-pwm", -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html