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1/*
2 * Mediatek Pulse Width Modulator driver
3 *
4 * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
5 * Copyright (C) 2017 Zhi Mao <zhi.mao@mediatek.com>
6 *
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
10 */
11
12#include <linux/err.h>
13#include <linux/io.h>
14#include <linux/ioport.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/clk.h>
18#include <linux/of.h>
19#include <linux/of_device.h>
20#include <linux/platform_device.h>
21#include <linux/pwm.h>
22#include <linux/slab.h>
23#include <linux/types.h>
24
25/* PWM registers and bits definitions */
26#define PWMCON 0x00
27#define PWMHDUR 0x04
28#define PWMLDUR 0x08
29#define PWMGDUR 0x0c
30#define PWMWAVENUM 0x28
31#define PWMDWIDTH 0x2c
32#define PWM45DWIDTH_FIXUP 0x30
33#define PWMTHRES 0x30
34#define PWM45THRES_FIXUP 0x34
35
36#define PWM_CLK_DIV_MAX 7
37
38enum {
39 MTK_CLK_MAIN = 0,
40 MTK_CLK_TOP,
41 MTK_CLK_PWM1,
42 MTK_CLK_PWM2,
43 MTK_CLK_PWM3,
44 MTK_CLK_PWM4,
45 MTK_CLK_PWM5,
46 MTK_CLK_PWM6,
47 MTK_CLK_PWM7,
48 MTK_CLK_PWM8,
49 MTK_CLK_MAX,
50};
51
52static const char * const mtk_pwm_clk_name[MTK_CLK_MAX] = {
53 "main", "top", "pwm1", "pwm2", "pwm3", "pwm4", "pwm5", "pwm6", "pwm7",
54 "pwm8"
55};
56
57struct mtk_pwm_platform_data {
58 unsigned int num_pwms;
59 bool pwm45_fixup;
60};
61
62/**
63 * struct mtk_pwm_chip - struct representing PWM chip
64 * @chip: linux PWM chip representation
65 * @regs: base address of PWM chip
66 * @clks: list of clocks
67 */
68struct mtk_pwm_chip {
69 struct pwm_chip chip;
70 void __iomem *regs;
71 struct clk *clks[MTK_CLK_MAX];
72 const struct mtk_pwm_platform_data *soc;
73};
74
75static const unsigned int mtk_pwm_reg_offset[] = {
76 0x0010, 0x0050, 0x0090, 0x00d0, 0x0110, 0x0150, 0x0190, 0x0220
77};
78
79static inline struct mtk_pwm_chip *to_mtk_pwm_chip(struct pwm_chip *chip)
80{
81 return container_of(chip, struct mtk_pwm_chip, chip);
82}
83
84static int mtk_pwm_clk_enable(struct pwm_chip *chip, struct pwm_device *pwm)
85{
86 struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip);
87 int ret;
88
89 ret = clk_prepare_enable(pc->clks[MTK_CLK_TOP]);
90 if (ret < 0)
91 return ret;
92
93 ret = clk_prepare_enable(pc->clks[MTK_CLK_MAIN]);
94 if (ret < 0)
95 goto disable_clk_top;
96
97 ret = clk_prepare_enable(pc->clks[MTK_CLK_PWM1 + pwm->hwpwm]);
98 if (ret < 0)
99 goto disable_clk_main;
100
101 return 0;
102
103disable_clk_main:
104 clk_disable_unprepare(pc->clks[MTK_CLK_MAIN]);
105disable_clk_top:
106 clk_disable_unprepare(pc->clks[MTK_CLK_TOP]);
107
108 return ret;
109}
110
111static void mtk_pwm_clk_disable(struct pwm_chip *chip, struct pwm_device *pwm)
112{
113 struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip);
114
115 clk_disable_unprepare(pc->clks[MTK_CLK_PWM1 + pwm->hwpwm]);
116 clk_disable_unprepare(pc->clks[MTK_CLK_MAIN]);
117 clk_disable_unprepare(pc->clks[MTK_CLK_TOP]);
118}
119
120static inline u32 mtk_pwm_readl(struct mtk_pwm_chip *chip, unsigned int num,
121 unsigned int offset)
122{
123 return readl(chip->regs + mtk_pwm_reg_offset[num] + offset);
124}
125
126static inline void mtk_pwm_writel(struct mtk_pwm_chip *chip,
127 unsigned int num, unsigned int offset,
128 u32 value)
129{
130 writel(value, chip->regs + mtk_pwm_reg_offset[num] + offset);
131}
132
133static int mtk_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
134 int duty_ns, int period_ns)
135{
136 struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip);
137 struct clk *clk = pc->clks[MTK_CLK_PWM1 + pwm->hwpwm];
138 u32 clkdiv = 0, cnt_period, cnt_duty, reg_width = PWMDWIDTH,
139 reg_thres = PWMTHRES;
140 u64 resolution;
141 int ret;
142
143 ret = mtk_pwm_clk_enable(chip, pwm);
144 if (ret < 0)
145 return ret;
146
147 /* Using resolution in picosecond gets accuracy higher */
148 resolution = (u64)NSEC_PER_SEC * 1000;
149 do_div(resolution, clk_get_rate(clk));
150
151 cnt_period = DIV_ROUND_CLOSEST_ULL((u64)period_ns * 1000, resolution);
152 while (cnt_period > 8191) {
153 resolution *= 2;
154 clkdiv++;
155 cnt_period = DIV_ROUND_CLOSEST_ULL((u64)period_ns * 1000,
156 resolution);
157 }
158
159 if (clkdiv > PWM_CLK_DIV_MAX) {
160 mtk_pwm_clk_disable(chip, pwm);
161 dev_err(chip->dev, "period %d not supported\n", period_ns);
162 return -EINVAL;
163 }
164
165 if (pc->soc->pwm45_fixup && pwm->hwpwm > 2) {
166 /*
167 * PWM[4,5] has distinct offset for PWMDWIDTH and PWMTHRES
168 * from the other PWMs on MT7623.
169 */
170 reg_width = PWM45DWIDTH_FIXUP;
171 reg_thres = PWM45THRES_FIXUP;
172 }
173
174 cnt_duty = DIV_ROUND_CLOSEST_ULL((u64)duty_ns * 1000, resolution);
175 mtk_pwm_writel(pc, pwm->hwpwm, PWMCON, BIT(15) | clkdiv);
176 mtk_pwm_writel(pc, pwm->hwpwm, reg_width, cnt_period);
177 mtk_pwm_writel(pc, pwm->hwpwm, reg_thres, cnt_duty);
178
179 mtk_pwm_clk_disable(chip, pwm);
180
181 return 0;
182}
183
184static int mtk_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
185{
186 struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip);
187 u32 value;
188 int ret;
189
190 ret = mtk_pwm_clk_enable(chip, pwm);
191 if (ret < 0)
192 return ret;
193
194 value = readl(pc->regs);
195 value |= BIT(pwm->hwpwm);
196 writel(value, pc->regs);
197
198 return 0;
199}
200
201static void mtk_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
202{
203 struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip);
204 u32 value;
205
206 value = readl(pc->regs);
207 value &= ~BIT(pwm->hwpwm);
208 writel(value, pc->regs);
209
210 mtk_pwm_clk_disable(chip, pwm);
211}
212
213static const struct pwm_ops mtk_pwm_ops = {
214 .config = mtk_pwm_config,
215 .enable = mtk_pwm_enable,
216 .disable = mtk_pwm_disable,
217 .owner = THIS_MODULE,
218};
219
220static int mtk_pwm_probe(struct platform_device *pdev)
221{
222 const struct mtk_pwm_platform_data *data;
223 struct mtk_pwm_chip *pc;
224 struct resource *res;
225 unsigned int i;
226 int ret;
227
228 pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
229 if (!pc)
230 return -ENOMEM;
231
232 data = of_device_get_match_data(&pdev->dev);
233 if (data == NULL)
234 return -EINVAL;
235 pc->soc = data;
236
237 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
238 pc->regs = devm_ioremap_resource(&pdev->dev, res);
239 if (IS_ERR(pc->regs))
240 return PTR_ERR(pc->regs);
241
242 for (i = 0; i < data->num_pwms + 2; i++) {
243 pc->clks[i] = devm_clk_get(&pdev->dev, mtk_pwm_clk_name[i]);
244 if (IS_ERR(pc->clks[i])) {
245 dev_err(&pdev->dev, "clock: %s fail: %ld\n",
246 mtk_pwm_clk_name[i], PTR_ERR(pc->clks[i]));
247 return PTR_ERR(pc->clks[i]);
248 }
249 }
250
251 platform_set_drvdata(pdev, pc);
252
253 pc->chip.dev = &pdev->dev;
254 pc->chip.ops = &mtk_pwm_ops;
255 pc->chip.base = -1;
256 pc->chip.npwm = data->num_pwms;
257
258 ret = pwmchip_add(&pc->chip);
259 if (ret < 0) {
260 dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
261 return ret;
262 }
263
264 return 0;
265}
266
267static int mtk_pwm_remove(struct platform_device *pdev)
268{
269 struct mtk_pwm_chip *pc = platform_get_drvdata(pdev);
270
271 return pwmchip_remove(&pc->chip);
272}
273
274static const struct mtk_pwm_platform_data mt2712_pwm_data = {
275 .num_pwms = 8,
276 .pwm45_fixup = false,
277};
278
279static const struct mtk_pwm_platform_data mt7622_pwm_data = {
280 .num_pwms = 6,
281 .pwm45_fixup = false,
282};
283
284static const struct mtk_pwm_platform_data mt7623_pwm_data = {
285 .num_pwms = 5,
286 .pwm45_fixup = true,
287};
288
289static const struct of_device_id mtk_pwm_of_match[] = {
290 { .compatible = "mediatek,mt2712-pwm", .data = &mt2712_pwm_data },
291 { .compatible = "mediatek,mt7622-pwm", .data = &mt7622_pwm_data },
292 { .compatible = "mediatek,mt7623-pwm", .data = &mt7623_pwm_data },
293 { },
294};
295MODULE_DEVICE_TABLE(of, mtk_pwm_of_match);
296
297static struct platform_driver mtk_pwm_driver = {
298 .driver = {
299 .name = "mtk-pwm",
300 .of_match_table = mtk_pwm_of_match,
301 },
302 .probe = mtk_pwm_probe,
303 .remove = mtk_pwm_remove,
304};
305module_platform_driver(mtk_pwm_driver);
306
307MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
308MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * MediaTek Pulse Width Modulator driver
4 *
5 * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
6 * Copyright (C) 2017 Zhi Mao <zhi.mao@mediatek.com>
7 *
8 */
9
10#include <linux/err.h>
11#include <linux/io.h>
12#include <linux/ioport.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/clk.h>
16#include <linux/of.h>
17#include <linux/of_device.h>
18#include <linux/platform_device.h>
19#include <linux/pwm.h>
20#include <linux/slab.h>
21#include <linux/types.h>
22
23/* PWM registers and bits definitions */
24#define PWMCON 0x00
25#define PWMHDUR 0x04
26#define PWMLDUR 0x08
27#define PWMGDUR 0x0c
28#define PWMWAVENUM 0x28
29#define PWMDWIDTH 0x2c
30#define PWM45DWIDTH_FIXUP 0x30
31#define PWMTHRES 0x30
32#define PWM45THRES_FIXUP 0x34
33
34#define PWM_CLK_DIV_MAX 7
35
36struct pwm_mediatek_of_data {
37 unsigned int num_pwms;
38 bool pwm45_fixup;
39};
40
41/**
42 * struct pwm_mediatek_chip - struct representing PWM chip
43 * @chip: linux PWM chip representation
44 * @regs: base address of PWM chip
45 * @clk_top: the top clock generator
46 * @clk_main: the clock used by PWM core
47 * @clk_pwms: the clock used by each PWM channel
48 * @clk_freq: the fix clock frequency of legacy MIPS SoC
49 * @soc: pointer to chip's platform data
50 */
51struct pwm_mediatek_chip {
52 struct pwm_chip chip;
53 void __iomem *regs;
54 struct clk *clk_top;
55 struct clk *clk_main;
56 struct clk **clk_pwms;
57 const struct pwm_mediatek_of_data *soc;
58};
59
60static const unsigned int pwm_mediatek_reg_offset[] = {
61 0x0010, 0x0050, 0x0090, 0x00d0, 0x0110, 0x0150, 0x0190, 0x0220
62};
63
64static inline struct pwm_mediatek_chip *
65to_pwm_mediatek_chip(struct pwm_chip *chip)
66{
67 return container_of(chip, struct pwm_mediatek_chip, chip);
68}
69
70static int pwm_mediatek_clk_enable(struct pwm_chip *chip,
71 struct pwm_device *pwm)
72{
73 struct pwm_mediatek_chip *pc = to_pwm_mediatek_chip(chip);
74 int ret;
75
76 ret = clk_prepare_enable(pc->clk_top);
77 if (ret < 0)
78 return ret;
79
80 ret = clk_prepare_enable(pc->clk_main);
81 if (ret < 0)
82 goto disable_clk_top;
83
84 ret = clk_prepare_enable(pc->clk_pwms[pwm->hwpwm]);
85 if (ret < 0)
86 goto disable_clk_main;
87
88 return 0;
89
90disable_clk_main:
91 clk_disable_unprepare(pc->clk_main);
92disable_clk_top:
93 clk_disable_unprepare(pc->clk_top);
94
95 return ret;
96}
97
98static void pwm_mediatek_clk_disable(struct pwm_chip *chip,
99 struct pwm_device *pwm)
100{
101 struct pwm_mediatek_chip *pc = to_pwm_mediatek_chip(chip);
102
103 clk_disable_unprepare(pc->clk_pwms[pwm->hwpwm]);
104 clk_disable_unprepare(pc->clk_main);
105 clk_disable_unprepare(pc->clk_top);
106}
107
108static inline u32 pwm_mediatek_readl(struct pwm_mediatek_chip *chip,
109 unsigned int num, unsigned int offset)
110{
111 return readl(chip->regs + pwm_mediatek_reg_offset[num] + offset);
112}
113
114static inline void pwm_mediatek_writel(struct pwm_mediatek_chip *chip,
115 unsigned int num, unsigned int offset,
116 u32 value)
117{
118 writel(value, chip->regs + pwm_mediatek_reg_offset[num] + offset);
119}
120
121static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm,
122 int duty_ns, int period_ns)
123{
124 struct pwm_mediatek_chip *pc = to_pwm_mediatek_chip(chip);
125 u32 clkdiv = 0, cnt_period, cnt_duty, reg_width = PWMDWIDTH,
126 reg_thres = PWMTHRES;
127 u64 resolution;
128 int ret;
129
130 ret = pwm_mediatek_clk_enable(chip, pwm);
131
132 if (ret < 0)
133 return ret;
134
135 /* Using resolution in picosecond gets accuracy higher */
136 resolution = (u64)NSEC_PER_SEC * 1000;
137 do_div(resolution, clk_get_rate(pc->clk_pwms[pwm->hwpwm]));
138
139 cnt_period = DIV_ROUND_CLOSEST_ULL((u64)period_ns * 1000, resolution);
140 while (cnt_period > 8191) {
141 resolution *= 2;
142 clkdiv++;
143 cnt_period = DIV_ROUND_CLOSEST_ULL((u64)period_ns * 1000,
144 resolution);
145 }
146
147 if (clkdiv > PWM_CLK_DIV_MAX) {
148 pwm_mediatek_clk_disable(chip, pwm);
149 dev_err(chip->dev, "period %d not supported\n", period_ns);
150 return -EINVAL;
151 }
152
153 if (pc->soc->pwm45_fixup && pwm->hwpwm > 2) {
154 /*
155 * PWM[4,5] has distinct offset for PWMDWIDTH and PWMTHRES
156 * from the other PWMs on MT7623.
157 */
158 reg_width = PWM45DWIDTH_FIXUP;
159 reg_thres = PWM45THRES_FIXUP;
160 }
161
162 cnt_duty = DIV_ROUND_CLOSEST_ULL((u64)duty_ns * 1000, resolution);
163 pwm_mediatek_writel(pc, pwm->hwpwm, PWMCON, BIT(15) | clkdiv);
164 pwm_mediatek_writel(pc, pwm->hwpwm, reg_width, cnt_period);
165 pwm_mediatek_writel(pc, pwm->hwpwm, reg_thres, cnt_duty);
166
167 pwm_mediatek_clk_disable(chip, pwm);
168
169 return 0;
170}
171
172static int pwm_mediatek_enable(struct pwm_chip *chip, struct pwm_device *pwm)
173{
174 struct pwm_mediatek_chip *pc = to_pwm_mediatek_chip(chip);
175 u32 value;
176 int ret;
177
178 ret = pwm_mediatek_clk_enable(chip, pwm);
179 if (ret < 0)
180 return ret;
181
182 value = readl(pc->regs);
183 value |= BIT(pwm->hwpwm);
184 writel(value, pc->regs);
185
186 return 0;
187}
188
189static void pwm_mediatek_disable(struct pwm_chip *chip, struct pwm_device *pwm)
190{
191 struct pwm_mediatek_chip *pc = to_pwm_mediatek_chip(chip);
192 u32 value;
193
194 value = readl(pc->regs);
195 value &= ~BIT(pwm->hwpwm);
196 writel(value, pc->regs);
197
198 pwm_mediatek_clk_disable(chip, pwm);
199}
200
201static const struct pwm_ops pwm_mediatek_ops = {
202 .config = pwm_mediatek_config,
203 .enable = pwm_mediatek_enable,
204 .disable = pwm_mediatek_disable,
205 .owner = THIS_MODULE,
206};
207
208static int pwm_mediatek_probe(struct platform_device *pdev)
209{
210 struct pwm_mediatek_chip *pc;
211 struct resource *res;
212 unsigned int i;
213 int ret;
214
215 pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
216 if (!pc)
217 return -ENOMEM;
218
219 pc->soc = of_device_get_match_data(&pdev->dev);
220
221 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
222 pc->regs = devm_ioremap_resource(&pdev->dev, res);
223 if (IS_ERR(pc->regs))
224 return PTR_ERR(pc->regs);
225
226 pc->clk_pwms = devm_kcalloc(&pdev->dev, pc->soc->num_pwms,
227 sizeof(*pc->clk_pwms), GFP_KERNEL);
228 if (!pc->clk_pwms)
229 return -ENOMEM;
230
231 pc->clk_top = devm_clk_get(&pdev->dev, "top");
232 if (IS_ERR(pc->clk_top)) {
233 dev_err(&pdev->dev, "clock: top fail: %ld\n",
234 PTR_ERR(pc->clk_top));
235 return PTR_ERR(pc->clk_top);
236 }
237
238 pc->clk_main = devm_clk_get(&pdev->dev, "main");
239 if (IS_ERR(pc->clk_main)) {
240 dev_err(&pdev->dev, "clock: main fail: %ld\n",
241 PTR_ERR(pc->clk_main));
242 return PTR_ERR(pc->clk_main);
243 }
244
245 for (i = 0; i < pc->soc->num_pwms; i++) {
246 char name[8];
247
248 snprintf(name, sizeof(name), "pwm%d", i + 1);
249
250 pc->clk_pwms[i] = devm_clk_get(&pdev->dev, name);
251 if (IS_ERR(pc->clk_pwms[i])) {
252 dev_err(&pdev->dev, "clock: %s fail: %ld\n",
253 name, PTR_ERR(pc->clk_pwms[i]));
254 return PTR_ERR(pc->clk_pwms[i]);
255 }
256 }
257
258 platform_set_drvdata(pdev, pc);
259
260 pc->chip.dev = &pdev->dev;
261 pc->chip.ops = &pwm_mediatek_ops;
262 pc->chip.base = -1;
263 pc->chip.npwm = pc->soc->num_pwms;
264
265 ret = pwmchip_add(&pc->chip);
266 if (ret < 0) {
267 dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
268 return ret;
269 }
270
271 return 0;
272}
273
274static int pwm_mediatek_remove(struct platform_device *pdev)
275{
276 struct pwm_mediatek_chip *pc = platform_get_drvdata(pdev);
277
278 return pwmchip_remove(&pc->chip);
279}
280
281static const struct pwm_mediatek_of_data mt2712_pwm_data = {
282 .num_pwms = 8,
283 .pwm45_fixup = false,
284};
285
286static const struct pwm_mediatek_of_data mt7622_pwm_data = {
287 .num_pwms = 6,
288 .pwm45_fixup = false,
289};
290
291static const struct pwm_mediatek_of_data mt7623_pwm_data = {
292 .num_pwms = 5,
293 .pwm45_fixup = true,
294};
295
296static const struct pwm_mediatek_of_data mt7628_pwm_data = {
297 .num_pwms = 4,
298 .pwm45_fixup = true,
299};
300
301static const struct pwm_mediatek_of_data mt7629_pwm_data = {
302 .num_pwms = 1,
303 .pwm45_fixup = false,
304};
305
306static const struct pwm_mediatek_of_data mt8516_pwm_data = {
307 .num_pwms = 5,
308 .pwm45_fixup = false,
309};
310
311static const struct of_device_id pwm_mediatek_of_match[] = {
312 { .compatible = "mediatek,mt2712-pwm", .data = &mt2712_pwm_data },
313 { .compatible = "mediatek,mt7622-pwm", .data = &mt7622_pwm_data },
314 { .compatible = "mediatek,mt7623-pwm", .data = &mt7623_pwm_data },
315 { .compatible = "mediatek,mt7628-pwm", .data = &mt7628_pwm_data },
316 { .compatible = "mediatek,mt7629-pwm", .data = &mt7629_pwm_data },
317 { .compatible = "mediatek,mt8516-pwm", .data = &mt8516_pwm_data },
318 { },
319};
320MODULE_DEVICE_TABLE(of, pwm_mediatek_of_match);
321
322static struct platform_driver pwm_mediatek_driver = {
323 .driver = {
324 .name = "pwm-mediatek",
325 .of_match_table = pwm_mediatek_of_match,
326 },
327 .probe = pwm_mediatek_probe,
328 .remove = pwm_mediatek_remove,
329};
330module_platform_driver(pwm_mediatek_driver);
331
332MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
333MODULE_LICENSE("GPL v2");