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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7e3b7dc7 YH |
2 | /* |
3 | * MediaTek display pulse-width-modulation controller driver. | |
4 | * Copyright (c) 2015 MediaTek Inc. | |
5 | * Author: YH Huang <yh.huang@mediatek.com> | |
7e3b7dc7 YH |
6 | */ |
7 | ||
3f2b1673 | 8 | #include <linux/bitfield.h> |
7e3b7dc7 YH |
9 | #include <linux/clk.h> |
10 | #include <linux/err.h> | |
11 | #include <linux/io.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/of.h> | |
cd4b45ac | 14 | #include <linux/of_device.h> |
7e3b7dc7 YH |
15 | #include <linux/platform_device.h> |
16 | #include <linux/pwm.h> | |
17 | #include <linux/slab.h> | |
18 | ||
19 | #define DISP_PWM_EN 0x00 | |
7e3b7dc7 | 20 | |
7e3b7dc7 YH |
21 | #define PWM_CLKDIV_SHIFT 16 |
22 | #define PWM_CLKDIV_MAX 0x3ff | |
23 | #define PWM_CLKDIV_MASK (PWM_CLKDIV_MAX << PWM_CLKDIV_SHIFT) | |
24 | ||
7e3b7dc7 YH |
25 | #define PWM_PERIOD_BIT_WIDTH 12 |
26 | #define PWM_PERIOD_MASK ((1 << PWM_PERIOD_BIT_WIDTH) - 1) | |
27 | ||
28 | #define PWM_HIGH_WIDTH_SHIFT 16 | |
29 | #define PWM_HIGH_WIDTH_MASK (0x1fff << PWM_HIGH_WIDTH_SHIFT) | |
30 | ||
cd4b45ac WK |
31 | struct mtk_pwm_data { |
32 | u32 enable_mask; | |
33 | unsigned int con0; | |
34 | u32 con0_sel; | |
35 | unsigned int con1; | |
36 | ||
37 | bool has_commit; | |
38 | unsigned int commit; | |
39 | unsigned int commit_mask; | |
40 | ||
41 | unsigned int bls_debug; | |
42 | u32 bls_debug_mask; | |
43 | }; | |
44 | ||
7e3b7dc7 YH |
45 | struct mtk_disp_pwm { |
46 | struct pwm_chip chip; | |
cd4b45ac | 47 | const struct mtk_pwm_data *data; |
7e3b7dc7 YH |
48 | struct clk *clk_main; |
49 | struct clk *clk_mm; | |
50 | void __iomem *base; | |
888a623d | 51 | bool enabled; |
7e3b7dc7 YH |
52 | }; |
53 | ||
54 | static inline struct mtk_disp_pwm *to_mtk_disp_pwm(struct pwm_chip *chip) | |
55 | { | |
56 | return container_of(chip, struct mtk_disp_pwm, chip); | |
57 | } | |
58 | ||
59 | static void mtk_disp_pwm_update_bits(struct mtk_disp_pwm *mdp, u32 offset, | |
60 | u32 mask, u32 data) | |
61 | { | |
62 | void __iomem *address = mdp->base + offset; | |
63 | u32 value; | |
64 | ||
65 | value = readl(address); | |
66 | value &= ~mask; | |
67 | value |= data; | |
68 | writel(value, address); | |
69 | } | |
70 | ||
888a623d JS |
71 | static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, |
72 | const struct pwm_state *state) | |
7e3b7dc7 YH |
73 | { |
74 | struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip); | |
75 | u32 clk_div, period, high_width, value; | |
76 | u64 div, rate; | |
77 | int err; | |
78 | ||
888a623d JS |
79 | if (state->polarity != PWM_POLARITY_NORMAL) |
80 | return -EINVAL; | |
81 | ||
82 | if (!state->enabled) { | |
83 | mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask, | |
84 | 0x0); | |
85 | ||
86 | if (mdp->enabled) { | |
87 | clk_disable_unprepare(mdp->clk_mm); | |
88 | clk_disable_unprepare(mdp->clk_main); | |
89 | } | |
90 | ||
91 | mdp->enabled = false; | |
92 | return 0; | |
d7a4e582 JS |
93 | } |
94 | ||
888a623d JS |
95 | if (!mdp->enabled) { |
96 | err = clk_prepare_enable(mdp->clk_main); | |
97 | if (err < 0) { | |
98 | dev_err(chip->dev, "Can't enable mdp->clk_main: %pe\n", | |
99 | ERR_PTR(err)); | |
100 | return err; | |
101 | } | |
102 | ||
103 | err = clk_prepare_enable(mdp->clk_mm); | |
104 | if (err < 0) { | |
105 | dev_err(chip->dev, "Can't enable mdp->clk_mm: %pe\n", | |
106 | ERR_PTR(err)); | |
107 | clk_disable_unprepare(mdp->clk_main); | |
108 | return err; | |
109 | } | |
d7a4e582 JS |
110 | } |
111 | ||
7e3b7dc7 YH |
112 | /* |
113 | * Find period, high_width and clk_div to suit duty_ns and period_ns. | |
114 | * Calculate proper div value to keep period value in the bound. | |
115 | * | |
116 | * period_ns = 10^9 * (clk_div + 1) * (period + 1) / PWM_CLK_RATE | |
117 | * duty_ns = 10^9 * (clk_div + 1) * high_width / PWM_CLK_RATE | |
118 | * | |
119 | * period = (PWM_CLK_RATE * period_ns) / (10^9 * (clk_div + 1)) - 1 | |
120 | * high_width = (PWM_CLK_RATE * duty_ns) / (10^9 * (clk_div + 1)) | |
121 | */ | |
122 | rate = clk_get_rate(mdp->clk_main); | |
331e049d | 123 | clk_div = mul_u64_u64_div_u64(state->period, rate, NSEC_PER_SEC) >> |
7e3b7dc7 | 124 | PWM_PERIOD_BIT_WIDTH; |
d7a4e582 | 125 | if (clk_div > PWM_CLKDIV_MAX) { |
888a623d JS |
126 | if (!mdp->enabled) { |
127 | clk_disable_unprepare(mdp->clk_mm); | |
128 | clk_disable_unprepare(mdp->clk_main); | |
129 | } | |
7e3b7dc7 | 130 | return -EINVAL; |
d7a4e582 | 131 | } |
7e3b7dc7 YH |
132 | |
133 | div = NSEC_PER_SEC * (clk_div + 1); | |
331e049d | 134 | period = mul_u64_u64_div_u64(state->period, rate, div); |
7e3b7dc7 YH |
135 | if (period > 0) |
136 | period--; | |
137 | ||
331e049d | 138 | high_width = mul_u64_u64_div_u64(state->duty_cycle, rate, div); |
7e3b7dc7 YH |
139 | value = period | (high_width << PWM_HIGH_WIDTH_SHIFT); |
140 | ||
cd4b45ac WK |
141 | mtk_disp_pwm_update_bits(mdp, mdp->data->con0, |
142 | PWM_CLKDIV_MASK, | |
7e3b7dc7 | 143 | clk_div << PWM_CLKDIV_SHIFT); |
cd4b45ac WK |
144 | mtk_disp_pwm_update_bits(mdp, mdp->data->con1, |
145 | PWM_PERIOD_MASK | PWM_HIGH_WIDTH_MASK, | |
146 | value); | |
147 | ||
148 | if (mdp->data->has_commit) { | |
149 | mtk_disp_pwm_update_bits(mdp, mdp->data->commit, | |
150 | mdp->data->commit_mask, | |
151 | mdp->data->commit_mask); | |
152 | mtk_disp_pwm_update_bits(mdp, mdp->data->commit, | |
153 | mdp->data->commit_mask, | |
154 | 0x0); | |
d7a4e582 JS |
155 | } else { |
156 | /* | |
157 | * For MT2701, disable double buffer before writing register | |
158 | * and select manual mode and use PWM_PERIOD/PWM_HIGH_WIDTH. | |
159 | */ | |
160 | mtk_disp_pwm_update_bits(mdp, mdp->data->bls_debug, | |
161 | mdp->data->bls_debug_mask, | |
162 | mdp->data->bls_debug_mask); | |
163 | mtk_disp_pwm_update_bits(mdp, mdp->data->con0, | |
164 | mdp->data->con0_sel, | |
165 | mdp->data->con0_sel); | |
cd4b45ac | 166 | } |
7e3b7dc7 | 167 | |
cd4b45ac WK |
168 | mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask, |
169 | mdp->data->enable_mask); | |
888a623d | 170 | mdp->enabled = true; |
7e3b7dc7 YH |
171 | |
172 | return 0; | |
173 | } | |
174 | ||
3f2b1673 JS |
175 | static void mtk_disp_pwm_get_state(struct pwm_chip *chip, |
176 | struct pwm_device *pwm, | |
177 | struct pwm_state *state) | |
178 | { | |
179 | struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip); | |
180 | u64 rate, period, high_width; | |
0b5ef342 | 181 | u32 clk_div, pwm_en, con0, con1; |
3f2b1673 JS |
182 | int err; |
183 | ||
184 | err = clk_prepare_enable(mdp->clk_main); | |
185 | if (err < 0) { | |
186 | dev_err(chip->dev, "Can't enable mdp->clk_main: %pe\n", ERR_PTR(err)); | |
187 | return; | |
188 | } | |
189 | ||
190 | err = clk_prepare_enable(mdp->clk_mm); | |
191 | if (err < 0) { | |
192 | dev_err(chip->dev, "Can't enable mdp->clk_mm: %pe\n", ERR_PTR(err)); | |
193 | clk_disable_unprepare(mdp->clk_main); | |
194 | return; | |
195 | } | |
196 | ||
197 | rate = clk_get_rate(mdp->clk_main); | |
198 | con0 = readl(mdp->base + mdp->data->con0); | |
199 | con1 = readl(mdp->base + mdp->data->con1); | |
0b5ef342 | 200 | pwm_en = readl(mdp->base + DISP_PWM_EN); |
201 | state->enabled = !!(pwm_en & mdp->data->enable_mask); | |
3f2b1673 JS |
202 | clk_div = FIELD_GET(PWM_CLKDIV_MASK, con0); |
203 | period = FIELD_GET(PWM_PERIOD_MASK, con1); | |
204 | /* | |
205 | * period has 12 bits, clk_div 11 and NSEC_PER_SEC has 30, | |
206 | * so period * (clk_div + 1) * NSEC_PER_SEC doesn't overflow. | |
207 | */ | |
208 | state->period = DIV64_U64_ROUND_UP(period * (clk_div + 1) * NSEC_PER_SEC, rate); | |
209 | high_width = FIELD_GET(PWM_HIGH_WIDTH_MASK, con1); | |
210 | state->duty_cycle = DIV64_U64_ROUND_UP(high_width * (clk_div + 1) * NSEC_PER_SEC, | |
211 | rate); | |
212 | state->polarity = PWM_POLARITY_NORMAL; | |
213 | clk_disable_unprepare(mdp->clk_mm); | |
214 | clk_disable_unprepare(mdp->clk_main); | |
215 | } | |
216 | ||
7e3b7dc7 | 217 | static const struct pwm_ops mtk_disp_pwm_ops = { |
888a623d | 218 | .apply = mtk_disp_pwm_apply, |
3f2b1673 | 219 | .get_state = mtk_disp_pwm_get_state, |
7e3b7dc7 YH |
220 | .owner = THIS_MODULE, |
221 | }; | |
222 | ||
223 | static int mtk_disp_pwm_probe(struct platform_device *pdev) | |
224 | { | |
225 | struct mtk_disp_pwm *mdp; | |
7e3b7dc7 YH |
226 | int ret; |
227 | ||
228 | mdp = devm_kzalloc(&pdev->dev, sizeof(*mdp), GFP_KERNEL); | |
229 | if (!mdp) | |
230 | return -ENOMEM; | |
231 | ||
cd4b45ac WK |
232 | mdp->data = of_device_get_match_data(&pdev->dev); |
233 | ||
6e0301e7 | 234 | mdp->base = devm_platform_ioremap_resource(pdev, 0); |
7e3b7dc7 YH |
235 | if (IS_ERR(mdp->base)) |
236 | return PTR_ERR(mdp->base); | |
237 | ||
238 | mdp->clk_main = devm_clk_get(&pdev->dev, "main"); | |
239 | if (IS_ERR(mdp->clk_main)) | |
240 | return PTR_ERR(mdp->clk_main); | |
241 | ||
242 | mdp->clk_mm = devm_clk_get(&pdev->dev, "mm"); | |
243 | if (IS_ERR(mdp->clk_mm)) | |
244 | return PTR_ERR(mdp->clk_mm); | |
245 | ||
7e3b7dc7 YH |
246 | mdp->chip.dev = &pdev->dev; |
247 | mdp->chip.ops = &mtk_disp_pwm_ops; | |
7e3b7dc7 YH |
248 | mdp->chip.npwm = 1; |
249 | ||
250 | ret = pwmchip_add(&mdp->chip); | |
251 | if (ret < 0) { | |
d7a4e582 JS |
252 | dev_err(&pdev->dev, "pwmchip_add() failed: %pe\n", ERR_PTR(ret)); |
253 | return ret; | |
7e3b7dc7 YH |
254 | } |
255 | ||
256 | platform_set_drvdata(pdev, mdp); | |
257 | ||
258 | return 0; | |
7e3b7dc7 YH |
259 | } |
260 | ||
261 | static int mtk_disp_pwm_remove(struct platform_device *pdev) | |
262 | { | |
263 | struct mtk_disp_pwm *mdp = platform_get_drvdata(pdev); | |
7e3b7dc7 | 264 | |
9b7b5736 | 265 | pwmchip_remove(&mdp->chip); |
7e3b7dc7 | 266 | |
9b7b5736 | 267 | return 0; |
7e3b7dc7 YH |
268 | } |
269 | ||
cd4b45ac WK |
270 | static const struct mtk_pwm_data mt2701_pwm_data = { |
271 | .enable_mask = BIT(16), | |
272 | .con0 = 0xa8, | |
273 | .con0_sel = 0x2, | |
274 | .con1 = 0xac, | |
275 | .has_commit = false, | |
276 | .bls_debug = 0xb0, | |
277 | .bls_debug_mask = 0x3, | |
278 | }; | |
279 | ||
280 | static const struct mtk_pwm_data mt8173_pwm_data = { | |
281 | .enable_mask = BIT(0), | |
282 | .con0 = 0x10, | |
283 | .con0_sel = 0x0, | |
284 | .con1 = 0x14, | |
285 | .has_commit = true, | |
286 | .commit = 0x8, | |
287 | .commit_mask = 0x1, | |
288 | }; | |
289 | ||
a87b4061 JS |
290 | static const struct mtk_pwm_data mt8183_pwm_data = { |
291 | .enable_mask = BIT(0), | |
292 | .con0 = 0x18, | |
293 | .con0_sel = 0x0, | |
294 | .con1 = 0x1c, | |
295 | .has_commit = false, | |
296 | .bls_debug = 0x80, | |
297 | .bls_debug_mask = 0x3, | |
298 | }; | |
299 | ||
7e3b7dc7 | 300 | static const struct of_device_id mtk_disp_pwm_of_match[] = { |
cd4b45ac WK |
301 | { .compatible = "mediatek,mt2701-disp-pwm", .data = &mt2701_pwm_data}, |
302 | { .compatible = "mediatek,mt6595-disp-pwm", .data = &mt8173_pwm_data}, | |
303 | { .compatible = "mediatek,mt8173-disp-pwm", .data = &mt8173_pwm_data}, | |
a87b4061 | 304 | { .compatible = "mediatek,mt8183-disp-pwm", .data = &mt8183_pwm_data}, |
7e3b7dc7 YH |
305 | { } |
306 | }; | |
307 | MODULE_DEVICE_TABLE(of, mtk_disp_pwm_of_match); | |
308 | ||
309 | static struct platform_driver mtk_disp_pwm_driver = { | |
310 | .driver = { | |
311 | .name = "mediatek-disp-pwm", | |
312 | .of_match_table = mtk_disp_pwm_of_match, | |
313 | }, | |
314 | .probe = mtk_disp_pwm_probe, | |
315 | .remove = mtk_disp_pwm_remove, | |
316 | }; | |
317 | module_platform_driver(mtk_disp_pwm_driver); | |
318 | ||
319 | MODULE_AUTHOR("YH Huang <yh.huang@mediatek.com>"); | |
320 | MODULE_DESCRIPTION("MediaTek SoC display PWM driver"); | |
321 | MODULE_LICENSE("GPL v2"); |