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Date:	Sat, 19 Jul 2014 20:55:29 +0800
From:	Caesar Wang <caesar.wang@...k-chips.com>
To:	heiko@...ech.de, thierry.reding@...il.com, b.galvani@...il.com
Cc:	cf@...k-chips.com, huangtao@...k-chips.com, addy.ke@...k-chips.com,
	xjq@...k-chips.com, linux-pwm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Caesar Wang <caesar.wang@...k-chips.com>
Subject: [PATCH v2 2/2] pwm: add this patch to support the new pwm of Rockchip SoCs

Suggested-by: Beniamino Galvani <b.galvani@...il.com>
Signed-off-by: Caesar Wang <caesar.wang@...k-chips.com>
---
 drivers/pwm/pwm-rockchip.c | 97 +++++++++++++++++++++++++++++++++++++---------
 1 file changed, 79 insertions(+), 18 deletions(-)

diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
index eec2145..3628a1b 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@...il.com>
+ * Copyright (C) 2014 Caesar Wang <caesar.wang@...k-chips.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -12,6 +13,7 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pwm.h>
 #include <linux/time.h>
@@ -23,14 +25,36 @@
 #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 +76,20 @@ 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 +106,9 @@ 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 +118,9 @@ 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 +132,47 @@ 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 rockchip_pwm_chip *pc;
 	struct resource *r;
 	int ret;
@@ -119,7 +182,10 @@ 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 (!strcmp(of_id->compatible, "rockchip,vop-pwm"))
+		pc->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
+	else
+		pc->base = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(pc->base))
 		return PTR_ERR(pc->base);
 
@@ -133,6 +199,7 @@ 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;
@@ -156,12 +223,6 @@ 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


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