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7e1449cd BT |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * Copyright (C) 2021 Aspeed Technology Inc. | |
4 | * | |
5 | * PWM/TACH controller driver for Aspeed ast2600 SoCs. | |
6 | * This drivers doesn't support earlier version of the IP. | |
7 | * | |
8 | * The hardware operates in time quantities of length | |
9 | * Q := (DIV_L + 1) << DIV_H / input-clk | |
10 | * The length of a PWM period is (DUTY_CYCLE_PERIOD + 1) * Q. | |
11 | * The maximal value for DUTY_CYCLE_PERIOD is used here to provide | |
12 | * a fine grained selection for the duty cycle. | |
13 | * | |
14 | * This driver uses DUTY_CYCLE_RISING_POINT = 0, so from the start of a | |
15 | * period the output is active until DUTY_CYCLE_FALLING_POINT * Q. Note | |
16 | * that if DUTY_CYCLE_RISING_POINT = DUTY_CYCLE_FALLING_POINT the output is | |
17 | * always active. | |
18 | * | |
19 | * Register usage: | |
20 | * PIN_ENABLE: When it is unset the pwm controller will emit inactive level to the external. | |
21 | * Use to determine whether the PWM channel is enabled or disabled | |
22 | * CLK_ENABLE: When it is unset the pwm controller will assert the duty counter reset and | |
23 | * emit inactive level to the PIN_ENABLE mux after that the driver can still change the pwm period | |
24 | * and duty and the value will apply when CLK_ENABLE be set again. | |
25 | * Use to determine whether duty_cycle bigger than 0. | |
26 | * PWM_ASPEED_CTRL_INVERSE: When it is toggled the output value will inverse immediately. | |
27 | * PWM_ASPEED_DUTY_CYCLE_FALLING_POINT/PWM_ASPEED_DUTY_CYCLE_RISING_POINT: When these two | |
28 | * values are equal it means the duty cycle = 100%. | |
29 | * | |
30 | * The glitch may generate at: | |
31 | * - Enabled changing when the duty_cycle bigger than 0% and less than 100%. | |
32 | * - Polarity changing when the duty_cycle bigger than 0% and less than 100%. | |
33 | * | |
34 | * Limitations: | |
35 | * - When changing both duty cycle and period, we cannot prevent in | |
36 | * software that the output might produce a period with mixed | |
37 | * settings. | |
38 | * - Disabling the PWM doesn't complete the current period. | |
39 | * | |
40 | * Improvements: | |
41 | * - When only changing one of duty cycle or period, our pwm controller will not | |
42 | * generate the glitch, the configure will change at next cycle of pwm. | |
43 | * This improvement can disable/enable through PWM_ASPEED_CTRL_DUTY_SYNC_DISABLE. | |
44 | */ | |
45 | ||
46 | #include <linux/bitfield.h> | |
47 | #include <linux/clk.h> | |
48 | #include <linux/delay.h> | |
49 | #include <linux/errno.h> | |
50 | #include <linux/hwmon.h> | |
51 | #include <linux/io.h> | |
52 | #include <linux/kernel.h> | |
53 | #include <linux/math64.h> | |
54 | #include <linux/module.h> | |
55 | #include <linux/of_device.h> | |
56 | #include <linux/of_platform.h> | |
57 | #include <linux/platform_device.h> | |
58 | #include <linux/pwm.h> | |
59 | #include <linux/reset.h> | |
60 | #include <linux/sysfs.h> | |
61 | ||
62 | /* The channel number of Aspeed pwm controller */ | |
63 | #define PWM_ASPEED_NR_PWMS 16 | |
64 | /* PWM Control Register */ | |
65 | #define PWM_ASPEED_CTRL(ch) ((ch) * 0x10 + 0x00) | |
66 | #define PWM_ASPEED_CTRL_LOAD_SEL_RISING_AS_WDT BIT(19) | |
67 | #define PWM_ASPEED_CTRL_DUTY_LOAD_AS_WDT_ENABLE BIT(18) | |
68 | #define PWM_ASPEED_CTRL_DUTY_SYNC_DISABLE BIT(17) | |
69 | #define PWM_ASPEED_CTRL_CLK_ENABLE BIT(16) | |
70 | #define PWM_ASPEED_CTRL_LEVEL_OUTPUT BIT(15) | |
71 | #define PWM_ASPEED_CTRL_INVERSE BIT(14) | |
72 | #define PWM_ASPEED_CTRL_OPEN_DRAIN_ENABLE BIT(13) | |
73 | #define PWM_ASPEED_CTRL_PIN_ENABLE BIT(12) | |
74 | #define PWM_ASPEED_CTRL_CLK_DIV_H GENMASK(11, 8) | |
75 | #define PWM_ASPEED_CTRL_CLK_DIV_L GENMASK(7, 0) | |
76 | ||
77 | /* PWM Duty Cycle Register */ | |
78 | #define PWM_ASPEED_DUTY_CYCLE(ch) ((ch) * 0x10 + 0x04) | |
79 | #define PWM_ASPEED_DUTY_CYCLE_PERIOD GENMASK(31, 24) | |
80 | #define PWM_ASPEED_DUTY_CYCLE_POINT_AS_WDT GENMASK(23, 16) | |
81 | #define PWM_ASPEED_DUTY_CYCLE_FALLING_POINT GENMASK(15, 8) | |
82 | #define PWM_ASPEED_DUTY_CYCLE_RISING_POINT GENMASK(7, 0) | |
83 | ||
84 | /* PWM fixed value */ | |
85 | #define PWM_ASPEED_FIXED_PERIOD FIELD_MAX(PWM_ASPEED_DUTY_CYCLE_PERIOD) | |
86 | ||
87 | /* The channel number of Aspeed tach controller */ | |
88 | #define TACH_ASPEED_NR_TACHS 16 | |
89 | /* TACH Control Register */ | |
90 | #define TACH_ASPEED_CTRL(ch) (((ch) * 0x10) + 0x08) | |
91 | #define TACH_ASPEED_IER BIT(31) | |
92 | #define TACH_ASPEED_INVERS_LIMIT BIT(30) | |
93 | #define TACH_ASPEED_LOOPBACK BIT(29) | |
94 | #define TACH_ASPEED_ENABLE BIT(28) | |
95 | #define TACH_ASPEED_DEBOUNCE_MASK GENMASK(27, 26) | |
96 | #define TACH_ASPEED_DEBOUNCE_BIT 26 | |
97 | #define TACH_ASPEED_IO_EDGE_MASK GENMASK(25, 24) | |
98 | #define TACH_ASPEED_IO_EDGE_BIT 24 | |
99 | #define TACH_ASPEED_CLK_DIV_T_MASK GENMASK(23, 20) | |
100 | #define TACH_ASPEED_CLK_DIV_BIT 20 | |
101 | #define TACH_ASPEED_THRESHOLD_MASK GENMASK(19, 0) | |
102 | /* [27:26] */ | |
103 | #define DEBOUNCE_3_CLK 0x00 | |
104 | #define DEBOUNCE_2_CLK 0x01 | |
105 | #define DEBOUNCE_1_CLK 0x02 | |
106 | #define DEBOUNCE_0_CLK 0x03 | |
107 | /* [25:24] */ | |
108 | #define F2F_EDGES 0x00 | |
109 | #define R2R_EDGES 0x01 | |
110 | #define BOTH_EDGES 0x02 | |
111 | /* [23:20] */ | |
112 | /* divisor = 4 to the nth power, n = register value */ | |
113 | #define DEFAULT_TACH_DIV 1024 | |
114 | #define DIV_TO_REG(divisor) (ilog2(divisor) >> 1) | |
115 | ||
116 | /* TACH Status Register */ | |
117 | #define TACH_ASPEED_STS(ch) (((ch) * 0x10) + 0x0C) | |
118 | ||
119 | /*PWM_TACH_STS */ | |
120 | #define TACH_ASPEED_ISR BIT(31) | |
121 | #define TACH_ASPEED_PWM_OUT BIT(25) | |
122 | #define TACH_ASPEED_PWM_OEN BIT(24) | |
123 | #define TACH_ASPEED_DEB_INPUT BIT(23) | |
124 | #define TACH_ASPEED_RAW_INPUT BIT(22) | |
125 | #define TACH_ASPEED_VALUE_UPDATE BIT(21) | |
126 | #define TACH_ASPEED_FULL_MEASUREMENT BIT(20) | |
127 | #define TACH_ASPEED_VALUE_MASK GENMASK(19, 0) | |
128 | /********************************************************** | |
129 | * Software setting | |
130 | *********************************************************/ | |
131 | #define DEFAULT_FAN_PULSE_PR 2 | |
132 | ||
133 | struct aspeed_pwm_tach_data { | |
134 | struct device *dev; | |
135 | void __iomem *base; | |
136 | struct clk *clk; | |
137 | struct reset_control *reset; | |
138 | unsigned long clk_rate; | |
7e1449cd BT |
139 | bool tach_present[TACH_ASPEED_NR_TACHS]; |
140 | u32 tach_divisor; | |
141 | }; | |
142 | ||
143 | static inline struct aspeed_pwm_tach_data * | |
144 | aspeed_pwm_chip_to_data(struct pwm_chip *chip) | |
145 | { | |
79dedfad | 146 | return pwmchip_get_drvdata(chip); |
7e1449cd BT |
147 | } |
148 | ||
149 | static int aspeed_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, | |
150 | struct pwm_state *state) | |
151 | { | |
152 | struct aspeed_pwm_tach_data *priv = aspeed_pwm_chip_to_data(chip); | |
153 | u32 hwpwm = pwm->hwpwm; | |
154 | bool polarity, pin_en, clk_en; | |
155 | u32 duty_pt, val; | |
156 | u64 div_h, div_l, duty_cycle_period, dividend; | |
157 | ||
158 | val = readl(priv->base + PWM_ASPEED_CTRL(hwpwm)); | |
159 | polarity = FIELD_GET(PWM_ASPEED_CTRL_INVERSE, val); | |
160 | pin_en = FIELD_GET(PWM_ASPEED_CTRL_PIN_ENABLE, val); | |
161 | clk_en = FIELD_GET(PWM_ASPEED_CTRL_CLK_ENABLE, val); | |
162 | div_h = FIELD_GET(PWM_ASPEED_CTRL_CLK_DIV_H, val); | |
163 | div_l = FIELD_GET(PWM_ASPEED_CTRL_CLK_DIV_L, val); | |
164 | val = readl(priv->base + PWM_ASPEED_DUTY_CYCLE(hwpwm)); | |
165 | duty_pt = FIELD_GET(PWM_ASPEED_DUTY_CYCLE_FALLING_POINT, val); | |
166 | duty_cycle_period = FIELD_GET(PWM_ASPEED_DUTY_CYCLE_PERIOD, val); | |
167 | /* | |
168 | * This multiplication doesn't overflow, the upper bound is | |
169 | * 1000000000 * 256 * 256 << 15 = 0x1dcd650000000000 | |
170 | */ | |
171 | dividend = (u64)NSEC_PER_SEC * (div_l + 1) * (duty_cycle_period + 1) | |
172 | << div_h; | |
173 | state->period = DIV_ROUND_UP_ULL(dividend, priv->clk_rate); | |
174 | ||
175 | if (clk_en && duty_pt) { | |
176 | dividend = (u64)NSEC_PER_SEC * (div_l + 1) * duty_pt | |
177 | << div_h; | |
178 | state->duty_cycle = DIV_ROUND_UP_ULL(dividend, priv->clk_rate); | |
179 | } else { | |
180 | state->duty_cycle = clk_en ? state->period : 0; | |
181 | } | |
182 | state->polarity = polarity ? PWM_POLARITY_INVERSED : PWM_POLARITY_NORMAL; | |
183 | state->enabled = pin_en; | |
184 | return 0; | |
185 | } | |
186 | ||
187 | static int aspeed_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, | |
188 | const struct pwm_state *state) | |
189 | { | |
190 | struct aspeed_pwm_tach_data *priv = aspeed_pwm_chip_to_data(chip); | |
191 | u32 hwpwm = pwm->hwpwm, duty_pt, val; | |
192 | u64 div_h, div_l, divisor, expect_period; | |
193 | bool clk_en; | |
194 | ||
195 | expect_period = div64_u64(ULLONG_MAX, (u64)priv->clk_rate); | |
196 | expect_period = min(expect_period, state->period); | |
940052bc | 197 | dev_dbg(pwmchip_parent(chip), "expect period: %lldns, duty_cycle: %lldns", |
7e1449cd BT |
198 | expect_period, state->duty_cycle); |
199 | /* | |
200 | * Pick the smallest value for div_h so that div_l can be the biggest | |
201 | * which results in a finer resolution near the target period value. | |
202 | */ | |
203 | divisor = (u64)NSEC_PER_SEC * (PWM_ASPEED_FIXED_PERIOD + 1) * | |
204 | (FIELD_MAX(PWM_ASPEED_CTRL_CLK_DIV_L) + 1); | |
205 | div_h = order_base_2(DIV64_U64_ROUND_UP(priv->clk_rate * expect_period, divisor)); | |
206 | if (div_h > 0xf) | |
207 | div_h = 0xf; | |
208 | ||
209 | divisor = ((u64)NSEC_PER_SEC * (PWM_ASPEED_FIXED_PERIOD + 1)) << div_h; | |
210 | div_l = div64_u64(priv->clk_rate * expect_period, divisor); | |
211 | ||
212 | if (div_l == 0) | |
213 | return -ERANGE; | |
214 | ||
215 | div_l -= 1; | |
216 | ||
217 | if (div_l > 255) | |
218 | div_l = 255; | |
219 | ||
940052bc | 220 | dev_dbg(pwmchip_parent(chip), "clk source: %ld div_h %lld, div_l : %lld\n", |
7e1449cd BT |
221 | priv->clk_rate, div_h, div_l); |
222 | /* duty_pt = duty_cycle * (PERIOD + 1) / period */ | |
223 | duty_pt = div64_u64(state->duty_cycle * priv->clk_rate, | |
224 | (u64)NSEC_PER_SEC * (div_l + 1) << div_h); | |
940052bc | 225 | dev_dbg(pwmchip_parent(chip), "duty_cycle = %lld, duty_pt = %d\n", |
7e1449cd BT |
226 | state->duty_cycle, duty_pt); |
227 | ||
228 | /* | |
229 | * Fixed DUTY_CYCLE_PERIOD to its max value to get a | |
230 | * fine-grained resolution for duty_cycle at the expense of a | |
231 | * coarser period resolution. | |
232 | */ | |
233 | val = readl(priv->base + PWM_ASPEED_DUTY_CYCLE(hwpwm)); | |
234 | val &= ~PWM_ASPEED_DUTY_CYCLE_PERIOD; | |
235 | val |= FIELD_PREP(PWM_ASPEED_DUTY_CYCLE_PERIOD, | |
236 | PWM_ASPEED_FIXED_PERIOD); | |
237 | writel(val, priv->base + PWM_ASPEED_DUTY_CYCLE(hwpwm)); | |
238 | ||
239 | if (duty_pt == 0) { | |
240 | /* emit inactive level and assert the duty counter reset */ | |
241 | clk_en = 0; | |
242 | } else { | |
243 | clk_en = 1; | |
244 | if (duty_pt >= (PWM_ASPEED_FIXED_PERIOD + 1)) | |
245 | duty_pt = 0; | |
246 | val = readl(priv->base + PWM_ASPEED_DUTY_CYCLE(hwpwm)); | |
247 | val &= ~(PWM_ASPEED_DUTY_CYCLE_RISING_POINT | | |
248 | PWM_ASPEED_DUTY_CYCLE_FALLING_POINT); | |
249 | val |= FIELD_PREP(PWM_ASPEED_DUTY_CYCLE_FALLING_POINT, duty_pt); | |
250 | writel(val, priv->base + PWM_ASPEED_DUTY_CYCLE(hwpwm)); | |
251 | } | |
252 | ||
253 | val = readl(priv->base + PWM_ASPEED_CTRL(hwpwm)); | |
254 | val &= ~(PWM_ASPEED_CTRL_CLK_DIV_H | PWM_ASPEED_CTRL_CLK_DIV_L | | |
255 | PWM_ASPEED_CTRL_PIN_ENABLE | PWM_ASPEED_CTRL_CLK_ENABLE | | |
256 | PWM_ASPEED_CTRL_INVERSE); | |
257 | val |= FIELD_PREP(PWM_ASPEED_CTRL_CLK_DIV_H, div_h) | | |
258 | FIELD_PREP(PWM_ASPEED_CTRL_CLK_DIV_L, div_l) | | |
259 | FIELD_PREP(PWM_ASPEED_CTRL_PIN_ENABLE, state->enabled) | | |
260 | FIELD_PREP(PWM_ASPEED_CTRL_CLK_ENABLE, clk_en) | | |
261 | FIELD_PREP(PWM_ASPEED_CTRL_INVERSE, state->polarity); | |
262 | writel(val, priv->base + PWM_ASPEED_CTRL(hwpwm)); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | static const struct pwm_ops aspeed_pwm_ops = { | |
268 | .apply = aspeed_pwm_apply, | |
269 | .get_state = aspeed_pwm_get_state, | |
270 | }; | |
271 | ||
272 | static void aspeed_tach_ch_enable(struct aspeed_pwm_tach_data *priv, u8 tach_ch, | |
273 | bool enable) | |
274 | { | |
275 | if (enable) | |
276 | writel(readl(priv->base + TACH_ASPEED_CTRL(tach_ch)) | | |
277 | TACH_ASPEED_ENABLE, | |
278 | priv->base + TACH_ASPEED_CTRL(tach_ch)); | |
279 | else | |
280 | writel(readl(priv->base + TACH_ASPEED_CTRL(tach_ch)) & | |
281 | ~TACH_ASPEED_ENABLE, | |
282 | priv->base + TACH_ASPEED_CTRL(tach_ch)); | |
283 | } | |
284 | ||
285 | static int aspeed_tach_val_to_rpm(struct aspeed_pwm_tach_data *priv, u32 tach_val) | |
286 | { | |
287 | u64 rpm; | |
288 | u32 tach_div; | |
289 | ||
290 | tach_div = tach_val * priv->tach_divisor * DEFAULT_FAN_PULSE_PR; | |
291 | ||
292 | dev_dbg(priv->dev, "clk %ld, tach_val %d , tach_div %d\n", | |
293 | priv->clk_rate, tach_val, tach_div); | |
294 | ||
295 | rpm = (u64)priv->clk_rate * 60; | |
296 | do_div(rpm, tach_div); | |
297 | ||
298 | return (int)rpm; | |
299 | } | |
300 | ||
301 | static int aspeed_get_fan_tach_ch_rpm(struct aspeed_pwm_tach_data *priv, | |
302 | u8 fan_tach_ch) | |
303 | { | |
304 | u32 val; | |
305 | ||
306 | val = readl(priv->base + TACH_ASPEED_STS(fan_tach_ch)); | |
307 | ||
308 | if (!(val & TACH_ASPEED_FULL_MEASUREMENT)) | |
309 | return 0; | |
310 | val = FIELD_GET(TACH_ASPEED_VALUE_MASK, val); | |
311 | return aspeed_tach_val_to_rpm(priv, val); | |
312 | } | |
313 | ||
314 | static int aspeed_tach_hwmon_read(struct device *dev, | |
315 | enum hwmon_sensor_types type, u32 attr, | |
316 | int channel, long *val) | |
317 | { | |
318 | struct aspeed_pwm_tach_data *priv = dev_get_drvdata(dev); | |
319 | u32 reg_val; | |
320 | ||
321 | switch (attr) { | |
322 | case hwmon_fan_input: | |
323 | *val = aspeed_get_fan_tach_ch_rpm(priv, channel); | |
324 | break; | |
325 | case hwmon_fan_div: | |
326 | reg_val = readl(priv->base + TACH_ASPEED_CTRL(channel)); | |
327 | reg_val = FIELD_GET(TACH_ASPEED_CLK_DIV_T_MASK, reg_val); | |
328 | *val = BIT(reg_val << 1); | |
329 | break; | |
330 | default: | |
331 | return -EOPNOTSUPP; | |
332 | } | |
333 | return 0; | |
334 | } | |
335 | ||
336 | static int aspeed_tach_hwmon_write(struct device *dev, | |
337 | enum hwmon_sensor_types type, u32 attr, | |
338 | int channel, long val) | |
339 | { | |
340 | struct aspeed_pwm_tach_data *priv = dev_get_drvdata(dev); | |
341 | u32 reg_val; | |
342 | ||
343 | switch (attr) { | |
344 | case hwmon_fan_div: | |
345 | if (!is_power_of_2(val) || (ilog2(val) % 2) || | |
346 | DIV_TO_REG(val) > 0xb) | |
347 | return -EINVAL; | |
348 | priv->tach_divisor = val; | |
349 | reg_val = readl(priv->base + TACH_ASPEED_CTRL(channel)); | |
350 | reg_val &= ~TACH_ASPEED_CLK_DIV_T_MASK; | |
351 | reg_val |= FIELD_PREP(TACH_ASPEED_CLK_DIV_T_MASK, | |
352 | DIV_TO_REG(priv->tach_divisor)); | |
353 | writel(reg_val, priv->base + TACH_ASPEED_CTRL(channel)); | |
354 | break; | |
355 | default: | |
356 | return -EOPNOTSUPP; | |
357 | } | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | static umode_t aspeed_tach_dev_is_visible(const void *drvdata, | |
363 | enum hwmon_sensor_types type, | |
364 | u32 attr, int channel) | |
365 | { | |
366 | const struct aspeed_pwm_tach_data *priv = drvdata; | |
367 | ||
368 | if (!priv->tach_present[channel]) | |
369 | return 0; | |
370 | switch (attr) { | |
371 | case hwmon_fan_input: | |
372 | return 0444; | |
373 | case hwmon_fan_div: | |
374 | return 0644; | |
375 | } | |
376 | return 0; | |
377 | } | |
378 | ||
379 | static const struct hwmon_ops aspeed_tach_ops = { | |
380 | .is_visible = aspeed_tach_dev_is_visible, | |
381 | .read = aspeed_tach_hwmon_read, | |
382 | .write = aspeed_tach_hwmon_write, | |
383 | }; | |
384 | ||
385 | static const struct hwmon_channel_info *aspeed_tach_info[] = { | |
386 | HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_DIV, HWMON_F_INPUT | HWMON_F_DIV, | |
387 | HWMON_F_INPUT | HWMON_F_DIV, HWMON_F_INPUT | HWMON_F_DIV, | |
388 | HWMON_F_INPUT | HWMON_F_DIV, HWMON_F_INPUT | HWMON_F_DIV, | |
389 | HWMON_F_INPUT | HWMON_F_DIV, HWMON_F_INPUT | HWMON_F_DIV, | |
390 | HWMON_F_INPUT | HWMON_F_DIV, HWMON_F_INPUT | HWMON_F_DIV, | |
391 | HWMON_F_INPUT | HWMON_F_DIV, HWMON_F_INPUT | HWMON_F_DIV, | |
392 | HWMON_F_INPUT | HWMON_F_DIV, HWMON_F_INPUT | HWMON_F_DIV, | |
393 | HWMON_F_INPUT | HWMON_F_DIV, HWMON_F_INPUT | HWMON_F_DIV), | |
394 | NULL | |
395 | }; | |
396 | ||
397 | static const struct hwmon_chip_info aspeed_tach_chip_info = { | |
398 | .ops = &aspeed_tach_ops, | |
399 | .info = aspeed_tach_info, | |
400 | }; | |
401 | ||
402 | static void aspeed_present_fan_tach(struct aspeed_pwm_tach_data *priv, u8 *tach_ch, int count) | |
403 | { | |
404 | u8 ch, index; | |
405 | u32 val; | |
406 | ||
407 | for (index = 0; index < count; index++) { | |
408 | ch = tach_ch[index]; | |
409 | priv->tach_present[ch] = true; | |
410 | priv->tach_divisor = DEFAULT_TACH_DIV; | |
411 | ||
412 | val = readl(priv->base + TACH_ASPEED_CTRL(ch)); | |
413 | val &= ~(TACH_ASPEED_INVERS_LIMIT | TACH_ASPEED_DEBOUNCE_MASK | | |
414 | TACH_ASPEED_IO_EDGE_MASK | TACH_ASPEED_CLK_DIV_T_MASK | | |
415 | TACH_ASPEED_THRESHOLD_MASK); | |
416 | val |= (DEBOUNCE_3_CLK << TACH_ASPEED_DEBOUNCE_BIT) | | |
417 | F2F_EDGES | | |
418 | FIELD_PREP(TACH_ASPEED_CLK_DIV_T_MASK, | |
419 | DIV_TO_REG(priv->tach_divisor)); | |
420 | writel(val, priv->base + TACH_ASPEED_CTRL(ch)); | |
421 | ||
422 | aspeed_tach_ch_enable(priv, ch, true); | |
423 | } | |
424 | } | |
425 | ||
426 | static int aspeed_create_fan_monitor(struct device *dev, | |
427 | struct device_node *child, | |
428 | struct aspeed_pwm_tach_data *priv) | |
429 | { | |
430 | int ret, count; | |
431 | u8 *tach_ch; | |
432 | ||
433 | count = of_property_count_u8_elems(child, "tach-ch"); | |
434 | if (count < 1) | |
435 | return -EINVAL; | |
436 | tach_ch = devm_kcalloc(dev, count, sizeof(*tach_ch), GFP_KERNEL); | |
437 | if (!tach_ch) | |
438 | return -ENOMEM; | |
439 | ret = of_property_read_u8_array(child, "tach-ch", tach_ch, count); | |
440 | if (ret) | |
441 | return ret; | |
442 | ||
443 | aspeed_present_fan_tach(priv, tach_ch, count); | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | static void aspeed_pwm_tach_reset_assert(void *data) | |
449 | { | |
450 | struct reset_control *rst = data; | |
451 | ||
452 | reset_control_assert(rst); | |
453 | } | |
454 | ||
455 | static int aspeed_pwm_tach_probe(struct platform_device *pdev) | |
456 | { | |
457 | struct device *dev = &pdev->dev, *hwmon; | |
458 | int ret; | |
459 | struct device_node *child; | |
460 | struct aspeed_pwm_tach_data *priv; | |
79dedfad | 461 | struct pwm_chip *chip; |
7e1449cd BT |
462 | |
463 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
464 | if (!priv) | |
465 | return -ENOMEM; | |
466 | priv->dev = dev; | |
467 | priv->base = devm_platform_ioremap_resource(pdev, 0); | |
468 | if (IS_ERR(priv->base)) | |
469 | return PTR_ERR(priv->base); | |
470 | ||
471 | priv->clk = devm_clk_get_enabled(dev, NULL); | |
472 | if (IS_ERR(priv->clk)) | |
473 | return dev_err_probe(dev, PTR_ERR(priv->clk), | |
474 | "Couldn't get clock\n"); | |
475 | priv->clk_rate = clk_get_rate(priv->clk); | |
476 | priv->reset = devm_reset_control_get_exclusive(dev, NULL); | |
477 | if (IS_ERR(priv->reset)) | |
478 | return dev_err_probe(dev, PTR_ERR(priv->reset), | |
479 | "Couldn't get reset control\n"); | |
480 | ||
481 | ret = reset_control_deassert(priv->reset); | |
482 | if (ret) | |
483 | return dev_err_probe(dev, ret, | |
484 | "Couldn't deassert reset control\n"); | |
485 | ret = devm_add_action_or_reset(dev, aspeed_pwm_tach_reset_assert, | |
486 | priv->reset); | |
487 | if (ret) | |
488 | return ret; | |
489 | ||
79dedfad UKK |
490 | chip = devm_pwmchip_alloc(dev, PWM_ASPEED_NR_PWMS, 0); |
491 | if (IS_ERR(chip)) | |
492 | return PTR_ERR(chip); | |
7e1449cd | 493 | |
79dedfad UKK |
494 | pwmchip_set_drvdata(chip, priv); |
495 | chip->ops = &aspeed_pwm_ops; | |
496 | ||
497 | ret = devm_pwmchip_add(dev, chip); | |
7e1449cd BT |
498 | if (ret) |
499 | return dev_err_probe(dev, ret, "Failed to add PWM chip\n"); | |
500 | ||
501 | for_each_child_of_node(dev->of_node, child) { | |
502 | ret = aspeed_create_fan_monitor(dev, child, priv); | |
503 | if (ret) { | |
504 | of_node_put(child); | |
505 | dev_warn(dev, "Failed to create fan %d", ret); | |
506 | return 0; | |
507 | } | |
508 | } | |
509 | ||
510 | hwmon = devm_hwmon_device_register_with_info(dev, "aspeed_tach", priv, | |
511 | &aspeed_tach_chip_info, NULL); | |
512 | ret = PTR_ERR_OR_ZERO(hwmon); | |
513 | if (ret) | |
514 | return dev_err_probe(dev, ret, | |
515 | "Failed to register hwmon device\n"); | |
516 | ||
517 | of_platform_populate(dev->of_node, NULL, NULL, dev); | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
e27cbb60 | 522 | static void aspeed_pwm_tach_remove(struct platform_device *pdev) |
7e1449cd BT |
523 | { |
524 | struct aspeed_pwm_tach_data *priv = platform_get_drvdata(pdev); | |
525 | ||
526 | reset_control_assert(priv->reset); | |
7e1449cd BT |
527 | } |
528 | ||
529 | static const struct of_device_id aspeed_pwm_tach_match[] = { | |
530 | { | |
531 | .compatible = "aspeed,ast2600-pwm-tach", | |
532 | }, | |
533 | {}, | |
534 | }; | |
535 | MODULE_DEVICE_TABLE(of, aspeed_pwm_tach_match); | |
536 | ||
537 | static struct platform_driver aspeed_pwm_tach_driver = { | |
538 | .probe = aspeed_pwm_tach_probe, | |
e27cbb60 | 539 | .remove_new = aspeed_pwm_tach_remove, |
7e1449cd BT |
540 | .driver = { |
541 | .name = "aspeed-g6-pwm-tach", | |
542 | .of_match_table = aspeed_pwm_tach_match, | |
543 | }, | |
544 | }; | |
545 | ||
546 | module_platform_driver(aspeed_pwm_tach_driver); | |
547 | ||
548 | MODULE_AUTHOR("Billy Tsai <billy_tsai@aspeedtech.com>"); | |
549 | MODULE_DESCRIPTION("Aspeed ast2600 PWM and Fan Tach device driver"); | |
550 | MODULE_LICENSE("GPL"); |