blob: 9cf0980345710cce465f4e7b499c14a140df1539 [file] [log] [blame]
Tom Rini10e47792018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Simon Glassc5915f72016-01-21 19:44:55 -07002/*
3 * Copyright (c) 2016 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
Simon Glassc5915f72016-01-21 19:44:55 -07005 */
6
7#include <common.h>
Kever Yangaee175e2016-08-12 17:57:48 +08008#include <clk.h>
Simon Glassc5915f72016-01-21 19:44:55 -07009#include <div64.h>
10#include <dm.h>
Simon Glass0f2af882020-05-10 11:40:05 -060011#include <log.h>
Simon Glassc5915f72016-01-21 19:44:55 -070012#include <pwm.h>
13#include <regmap.h>
14#include <syscon.h>
Simon Glass3ba929a2020-10-30 21:38:53 -060015#include <asm/global_data.h>
Simon Glassc5915f72016-01-21 19:44:55 -070016#include <asm/io.h>
Kever Yang9fbe17c2019-03-28 11:01:23 +080017#include <asm/arch-rockchip/pwm.h>
Simon Glass4dcacfc2020-05-10 11:40:13 -060018#include <linux/bitops.h>
Simon Glassc5915f72016-01-21 19:44:55 -070019#include <power/regulator.h>
20
David Wueb829182019-12-03 17:49:53 +080021DECLARE_GLOBAL_DATA_PTR;
22
23struct rockchip_pwm_data {
24 struct rockchip_pwm_regs regs;
25 unsigned int prescaler;
26 bool supports_polarity;
27 bool supports_lock;
28 u32 enable_conf;
29 u32 enable_conf_mask;
30};
31
Simon Glassc5915f72016-01-21 19:44:55 -070032struct rk_pwm_priv {
David Wueb829182019-12-03 17:49:53 +080033 fdt_addr_t base;
Kever Yangaee175e2016-08-12 17:57:48 +080034 ulong freq;
David Wueb829182019-12-03 17:49:53 +080035 u32 conf_polarity;
36 const struct rockchip_pwm_data *data;
Simon Glassc5915f72016-01-21 19:44:55 -070037};
38
Kever Yang73326e92017-04-24 10:27:50 +080039static int rk_pwm_set_invert(struct udevice *dev, uint channel, bool polarity)
40{
41 struct rk_pwm_priv *priv = dev_get_priv(dev);
42
David Wueb829182019-12-03 17:49:53 +080043 if (!priv->data->supports_polarity) {
44 debug("%s: Do not support polarity\n", __func__);
45 return 0;
46 }
47
Kever Yang73326e92017-04-24 10:27:50 +080048 debug("%s: polarity=%u\n", __func__, polarity);
49 if (polarity)
David Wueb829182019-12-03 17:49:53 +080050 priv->conf_polarity = PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSTIVE;
Kever Yang73326e92017-04-24 10:27:50 +080051 else
David Wueb829182019-12-03 17:49:53 +080052 priv->conf_polarity = PWM_DUTY_POSTIVE | PWM_INACTIVE_NEGATIVE;
Kever Yang73326e92017-04-24 10:27:50 +080053
54 return 0;
55}
56
Simon Glassc5915f72016-01-21 19:44:55 -070057static int rk_pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
58 uint duty_ns)
59{
60 struct rk_pwm_priv *priv = dev_get_priv(dev);
David Wueb829182019-12-03 17:49:53 +080061 const struct rockchip_pwm_regs *regs = &priv->data->regs;
Simon Glassc5915f72016-01-21 19:44:55 -070062 unsigned long period, duty;
David Wueb829182019-12-03 17:49:53 +080063 u32 ctrl;
Simon Glassc5915f72016-01-21 19:44:55 -070064
65 debug("%s: period_ns=%u, duty_ns=%u\n", __func__, period_ns, duty_ns);
David Wueb829182019-12-03 17:49:53 +080066
67 ctrl = readl(priv->base + regs->ctrl);
68 /*
69 * Lock the period and duty of previous configuration, then
70 * change the duty and period, that would not be effective.
71 */
72 if (priv->data->supports_lock) {
73 ctrl |= PWM_LOCK;
74 writel(ctrl, priv->base + regs->ctrl);
75 }
76
77 period = lldiv((uint64_t)priv->freq * period_ns,
78 priv->data->prescaler * 1000000000);
79 duty = lldiv((uint64_t)priv->freq * duty_ns,
80 priv->data->prescaler * 1000000000);
81
82 writel(period, priv->base + regs->period);
83 writel(duty, priv->base + regs->duty);
Simon Glassc5915f72016-01-21 19:44:55 -070084
David Wueb829182019-12-03 17:49:53 +080085 if (priv->data->supports_polarity) {
86 ctrl &= ~(PWM_DUTY_MASK | PWM_INACTIVE_MASK);
87 ctrl |= priv->conf_polarity;
88 }
89
90 /*
91 * Unlock and set polarity at the same time,
92 * the configuration of duty, period and polarity
93 * would be effective together at next period.
94 */
95 if (priv->data->supports_lock)
96 ctrl &= ~PWM_LOCK;
97 writel(ctrl, priv->base + regs->ctrl);
Simon Glassc5915f72016-01-21 19:44:55 -070098
Simon Glassc5915f72016-01-21 19:44:55 -070099 debug("%s: period=%lu, duty=%lu\n", __func__, period, duty);
100
101 return 0;
102}
103
104static int rk_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
105{
106 struct rk_pwm_priv *priv = dev_get_priv(dev);
David Wueb829182019-12-03 17:49:53 +0800107 const struct rockchip_pwm_regs *regs = &priv->data->regs;
108 u32 ctrl;
Simon Glassc5915f72016-01-21 19:44:55 -0700109
110 debug("%s: Enable '%s'\n", __func__, dev->name);
David Wueb829182019-12-03 17:49:53 +0800111
112 ctrl = readl(priv->base + regs->ctrl);
113 ctrl &= ~priv->data->enable_conf_mask;
114
115 if (enable)
116 ctrl |= priv->data->enable_conf;
117 else
118 ctrl &= ~priv->data->enable_conf;
119
120 writel(ctrl, priv->base + regs->ctrl);
Simon Glassc5915f72016-01-21 19:44:55 -0700121
122 return 0;
123}
124
Simon Glassaad29ae2020-12-03 16:55:21 -0700125static int rk_pwm_of_to_plat(struct udevice *dev)
Simon Glassc5915f72016-01-21 19:44:55 -0700126{
127 struct rk_pwm_priv *priv = dev_get_priv(dev);
Simon Glassc5915f72016-01-21 19:44:55 -0700128
David Wueb829182019-12-03 17:49:53 +0800129 priv->base = dev_read_addr(dev);
Simon Glassc5915f72016-01-21 19:44:55 -0700130
131 return 0;
132}
133
134static int rk_pwm_probe(struct udevice *dev)
135{
136 struct rk_pwm_priv *priv = dev_get_priv(dev);
Kever Yangaee175e2016-08-12 17:57:48 +0800137 struct clk clk;
138 int ret = 0;
Simon Glassc5915f72016-01-21 19:44:55 -0700139
Kever Yangaee175e2016-08-12 17:57:48 +0800140 ret = clk_get_by_index(dev, 0, &clk);
141 if (ret < 0) {
142 debug("%s get clock fail!\n", __func__);
143 return -EINVAL;
144 }
David Wueb829182019-12-03 17:49:53 +0800145
Kever Yangaee175e2016-08-12 17:57:48 +0800146 priv->freq = clk_get_rate(&clk);
David Wueb829182019-12-03 17:49:53 +0800147 priv->data = (struct rockchip_pwm_data *)dev_get_driver_data(dev);
148
149 if (priv->data->supports_polarity)
150 priv->conf_polarity = PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE;
Kever Yangaee175e2016-08-12 17:57:48 +0800151
Simon Glassc5915f72016-01-21 19:44:55 -0700152 return 0;
153}
154
155static const struct pwm_ops rk_pwm_ops = {
Kever Yang73326e92017-04-24 10:27:50 +0800156 .set_invert = rk_pwm_set_invert,
Simon Glassc5915f72016-01-21 19:44:55 -0700157 .set_config = rk_pwm_set_config,
158 .set_enable = rk_pwm_set_enable,
159};
160
David Wueb829182019-12-03 17:49:53 +0800161static const struct rockchip_pwm_data pwm_data_v1 = {
162 .regs = {
163 .duty = 0x04,
164 .period = 0x08,
165 .cntr = 0x00,
166 .ctrl = 0x0c,
167 },
168 .prescaler = 2,
169 .supports_polarity = false,
170 .supports_lock = false,
171 .enable_conf = PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN,
172 .enable_conf_mask = BIT(1) | BIT(3),
173};
174
175static const struct rockchip_pwm_data pwm_data_v2 = {
176 .regs = {
177 .duty = 0x08,
178 .period = 0x04,
179 .cntr = 0x00,
180 .ctrl = 0x0c,
181 },
182 .prescaler = 1,
183 .supports_polarity = true,
184 .supports_lock = false,
185 .enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | RK_PWM_ENABLE |
186 PWM_CONTINUOUS,
187 .enable_conf_mask = GENMASK(2, 0) | BIT(5) | BIT(8),
188};
189
190static const struct rockchip_pwm_data pwm_data_v3 = {
191 .regs = {
192 .duty = 0x08,
193 .period = 0x04,
194 .cntr = 0x00,
195 .ctrl = 0x0c,
196 },
197 .prescaler = 1,
198 .supports_polarity = true,
199 .supports_lock = true,
200 .enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | RK_PWM_ENABLE |
201 PWM_CONTINUOUS,
202 .enable_conf_mask = GENMASK(2, 0) | BIT(5) | BIT(8),
203};
204
Simon Glassc5915f72016-01-21 19:44:55 -0700205static const struct udevice_id rk_pwm_ids[] = {
David Wueb829182019-12-03 17:49:53 +0800206 { .compatible = "rockchip,rk2928-pwm", .data = (ulong)&pwm_data_v1},
207 { .compatible = "rockchip,rk3288-pwm", .data = (ulong)&pwm_data_v2},
208 { .compatible = "rockchip,rk3328-pwm", .data = (ulong)&pwm_data_v3},
Simon Glassc5915f72016-01-21 19:44:55 -0700209 { }
210};
211
212U_BOOT_DRIVER(rk_pwm) = {
213 .name = "rk_pwm",
214 .id = UCLASS_PWM,
215 .of_match = rk_pwm_ids,
216 .ops = &rk_pwm_ops,
Simon Glassaad29ae2020-12-03 16:55:21 -0700217 .of_to_plat = rk_pwm_of_to_plat,
Simon Glassc5915f72016-01-21 19:44:55 -0700218 .probe = rk_pwm_probe,
Simon Glass8a2b47f2020-12-03 16:55:17 -0700219 .priv_auto = sizeof(struct rk_pwm_priv),
Simon Glassc5915f72016-01-21 19:44:55 -0700220};