pwm: rockchip: Added to support for RK3288 SoC

This patch added to support the PWM controller found on
RK3288 SoC.

Signed-off-by: Caesar Wang <caesar.wang@rock-chips.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

1 files changed, 111 insertions, 24 deletions

diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
index eec214568193..bdd8644c01cf 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@gmail.com>
+ * Copyright (C) 2014 ROCKCHIP, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -12,30 +13,81 @@
 #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>
 
-#define PWM_CNTR                0x00            /* Counter register */
-#define PWM_HRC                 0x04            /* High reference register */
-#define PWM_LRC                 0x08            /* Low reference register */
-#define PWM_CTRL                0x0c            /* Control register */
 #define PWM_CTRL_TIMER_EN       (1 << 0)
 #define PWM_CTRL_OUTPUT_EN      (1 << 3)
 
-#define PRESCALER               2
+#define PWM_ENABLE              (1 << 0)
+#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)
 
 struct rockchip_pwm_chip {
         struct pwm_chip chip;
         struct clk *clk;
+        const struct rockchip_pwm_data *data;
         void __iomem *base;
 };
 
+struct rockchip_pwm_regs {
+        unsigned long duty;
+        unsigned long period;
+        unsigned long cntr;
+        unsigned long ctrl;
+};
+
+struct rockchip_pwm_data {
+        struct rockchip_pwm_regs regs;
+        unsigned int prescaler;
+
+        void (*set_enable)(struct pwm_chip *chip, bool enable);
+};
+
 static inline struct rockchip_pwm_chip *to_rockchip_pwm_chip(struct pwm_chip *c)
 {
         return container_of(c, struct rockchip_pwm_chip, chip);
 }
 
+static void rockchip_pwm_set_enable_v1(struct pwm_chip *chip, bool enable)
+{
+        struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
+        u32 enable_conf = PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN;
+        u32 val;
+
+        val = readl_relaxed(pc->base + pc->data->regs.ctrl);
+
+        if (enable)
+                val |= enable_conf;
+        else
+                val &= ~enable_conf;
+
+        writel_relaxed(val, pc->base + pc->data->regs.ctrl);
+}
+
+static void rockchip_pwm_set_enable_v2(struct pwm_chip *chip, bool enable)
+{
+        struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
+        u32 enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | PWM_ENABLE |
+                          PWM_CONTINUOUS | PWM_DUTY_POSITIVE |
+                          PWM_INACTIVE_NEGATIVE;
+        u32 val;
+
+        val = readl_relaxed(pc->base + pc->data->regs.ctrl);
+
+        if (enable)
+                val |= enable_conf;
+        else
+                val &= ~enable_conf;
+
+        writel_relaxed(val, pc->base + pc->data->regs.ctrl);
+}
+
 static int rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
                                int duty_ns, int period_ns)
 {
@@ -52,20 +104,20 @@ 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->regs.period);
+        writel(duty, pc->base + pc->data->regs.duty);
+        writel(0, pc->base + pc->data->regs.cntr);
 
         clk_disable(pc->clk);
 
@@ -76,15 +128,12 @@ static int rockchip_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
         struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
         int ret;
-        u32 val;
 
         ret = clk_enable(pc->clk);
         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);
+        pc->data->set_enable(chip, true);
 
         return 0;
 }
@@ -92,11 +141,8 @@ static int rockchip_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 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);
+        pc->data->set_enable(chip, false);
 
         clk_disable(pc->clk);
 }
@@ -108,12 +154,58 @@ static const struct pwm_ops rockchip_pwm_ops = {
         .owner = THIS_MODULE,
 };
 
+static const struct rockchip_pwm_data pwm_data_v1 = {
+        .regs = {
+                .duty = 0x04,
+                .period = 0x08,
+                .cntr = 0x00,
+                .ctrl = 0x0c,
+        },
+        .prescaler = 2,
+        .set_enable = rockchip_pwm_set_enable_v1,
+};
+
+static const struct rockchip_pwm_data pwm_data_v2 = {
+        .regs = {
+                .duty = 0x08,
+                .period = 0x04,
+                .cntr = 0x00,
+                .ctrl = 0x0c,
+        },
+        .prescaler = 1,
+        .set_enable = rockchip_pwm_set_enable_v2,
+};
+
+static const struct rockchip_pwm_data pwm_data_vop = {
+        .regs = {
+                .duty = 0x08,
+                .period = 0x04,
+                .cntr = 0x0c,
+                .ctrl = 0x00,
+        },
+        .prescaler = 1,
+        .set_enable = rockchip_pwm_set_enable_v2,
+};
+
+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 *id;
         struct rockchip_pwm_chip *pc;
         struct resource *r;
         int ret;
 
+        id = of_match_device(rockchip_pwm_dt_ids, &pdev->dev);
+        if (!id)
+                return -EINVAL;
+
         pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
         if (!pc)
                 return -ENOMEM;
@@ -133,6 +225,7 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, pc);
 
+        pc->data = id->data;
         pc->chip.dev = &pdev->dev;
         pc->chip.ops = &rockchip_pwm_ops;
         pc->chip.base = -1;
@@ -156,12 +249,6 @@ 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",