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1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2014-2018 Nuvoton Technology corporation.
3
4#include <linux/clk.h>
5#include <linux/device.h>
6#include <linux/hwmon.h>
7#include <linux/hwmon-sysfs.h>
8#include <linux/interrupt.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/of_address.h>
12#include <linux/of_irq.h>
13#include <linux/platform_device.h>
14#include <linux/spinlock.h>
15#include <linux/sysfs.h>
16#include <linux/thermal.h>
17
18/* NPCM7XX PWM registers */
19#define NPCM7XX_PWM_REG_BASE(base, n) ((base) + ((n) * 0x1000L))
20
21#define NPCM7XX_PWM_REG_PR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x00)
22#define NPCM7XX_PWM_REG_CSR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x04)
23#define NPCM7XX_PWM_REG_CR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x08)
24#define NPCM7XX_PWM_REG_CNRx(base, n, ch) \
25 (NPCM7XX_PWM_REG_BASE(base, n) + 0x0C + (12 * (ch)))
26#define NPCM7XX_PWM_REG_CMRx(base, n, ch) \
27 (NPCM7XX_PWM_REG_BASE(base, n) + 0x10 + (12 * (ch)))
28#define NPCM7XX_PWM_REG_PDRx(base, n, ch) \
29 (NPCM7XX_PWM_REG_BASE(base, n) + 0x14 + (12 * (ch)))
30#define NPCM7XX_PWM_REG_PIER(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x3C)
31#define NPCM7XX_PWM_REG_PIIR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x40)
32
33#define NPCM7XX_PWM_CTRL_CH0_MODE_BIT BIT(3)
34#define NPCM7XX_PWM_CTRL_CH1_MODE_BIT BIT(11)
35#define NPCM7XX_PWM_CTRL_CH2_MODE_BIT BIT(15)
36#define NPCM7XX_PWM_CTRL_CH3_MODE_BIT BIT(19)
37
38#define NPCM7XX_PWM_CTRL_CH0_INV_BIT BIT(2)
39#define NPCM7XX_PWM_CTRL_CH1_INV_BIT BIT(10)
40#define NPCM7XX_PWM_CTRL_CH2_INV_BIT BIT(14)
41#define NPCM7XX_PWM_CTRL_CH3_INV_BIT BIT(18)
42
43#define NPCM7XX_PWM_CTRL_CH0_EN_BIT BIT(0)
44#define NPCM7XX_PWM_CTRL_CH1_EN_BIT BIT(8)
45#define NPCM7XX_PWM_CTRL_CH2_EN_BIT BIT(12)
46#define NPCM7XX_PWM_CTRL_CH3_EN_BIT BIT(16)
47
48/* Define the maximum PWM channel number */
49#define NPCM7XX_PWM_MAX_CHN_NUM 12
50#define NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE 4
51#define NPCM7XX_PWM_MAX_MODULES 3
52
53/* Define the Counter Register, value = 100 for match 100% */
54#define NPCM7XX_PWM_COUNTER_DEFAULT_NUM 255
55#define NPCM7XX_PWM_CMR_DEFAULT_NUM 255
56#define NPCM7XX_PWM_CMR_MAX 255
57
58/* default all PWM channels PRESCALE2 = 1 */
59#define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH0 0x4
60#define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH1 0x40
61#define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH2 0x400
62#define NPCM7XX_PWM_PRESCALE2_DEFAULT_CH3 0x4000
63
64#define PWM_OUTPUT_FREQ_25KHZ 25000
65#define PWN_CNT_DEFAULT 256
66#define MIN_PRESCALE1 2
67#define NPCM7XX_PWM_PRESCALE_SHIFT_CH01 8
68
69#define NPCM7XX_PWM_PRESCALE2_DEFAULT (NPCM7XX_PWM_PRESCALE2_DEFAULT_CH0 | \
70 NPCM7XX_PWM_PRESCALE2_DEFAULT_CH1 | \
71 NPCM7XX_PWM_PRESCALE2_DEFAULT_CH2 | \
72 NPCM7XX_PWM_PRESCALE2_DEFAULT_CH3)
73
74#define NPCM7XX_PWM_CTRL_MODE_DEFAULT (NPCM7XX_PWM_CTRL_CH0_MODE_BIT | \
75 NPCM7XX_PWM_CTRL_CH1_MODE_BIT | \
76 NPCM7XX_PWM_CTRL_CH2_MODE_BIT | \
77 NPCM7XX_PWM_CTRL_CH3_MODE_BIT)
78
79/* NPCM7XX FAN Tacho registers */
80#define NPCM7XX_FAN_REG_BASE(base, n) ((base) + ((n) * 0x1000L))
81
82#define NPCM7XX_FAN_REG_TCNT1(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x00)
83#define NPCM7XX_FAN_REG_TCRA(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x02)
84#define NPCM7XX_FAN_REG_TCRB(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x04)
85#define NPCM7XX_FAN_REG_TCNT2(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x06)
86#define NPCM7XX_FAN_REG_TPRSC(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x08)
87#define NPCM7XX_FAN_REG_TCKC(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x0A)
88#define NPCM7XX_FAN_REG_TMCTRL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x0C)
89#define NPCM7XX_FAN_REG_TICTRL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x0E)
90#define NPCM7XX_FAN_REG_TICLR(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x10)
91#define NPCM7XX_FAN_REG_TIEN(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x12)
92#define NPCM7XX_FAN_REG_TCPA(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x14)
93#define NPCM7XX_FAN_REG_TCPB(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x16)
94#define NPCM7XX_FAN_REG_TCPCFG(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x18)
95#define NPCM7XX_FAN_REG_TINASEL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x1A)
96#define NPCM7XX_FAN_REG_TINBSEL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x1C)
97
98#define NPCM7XX_FAN_TCKC_CLKX_NONE 0
99#define NPCM7XX_FAN_TCKC_CLK1_APB BIT(0)
100#define NPCM7XX_FAN_TCKC_CLK2_APB BIT(3)
101
102#define NPCM7XX_FAN_TMCTRL_TBEN BIT(6)
103#define NPCM7XX_FAN_TMCTRL_TAEN BIT(5)
104#define NPCM7XX_FAN_TMCTRL_TBEDG BIT(4)
105#define NPCM7XX_FAN_TMCTRL_TAEDG BIT(3)
106#define NPCM7XX_FAN_TMCTRL_MODE_5 BIT(2)
107
108#define NPCM7XX_FAN_TICLR_CLEAR_ALL GENMASK(5, 0)
109#define NPCM7XX_FAN_TICLR_TFCLR BIT(5)
110#define NPCM7XX_FAN_TICLR_TECLR BIT(4)
111#define NPCM7XX_FAN_TICLR_TDCLR BIT(3)
112#define NPCM7XX_FAN_TICLR_TCCLR BIT(2)
113#define NPCM7XX_FAN_TICLR_TBCLR BIT(1)
114#define NPCM7XX_FAN_TICLR_TACLR BIT(0)
115
116#define NPCM7XX_FAN_TIEN_ENABLE_ALL GENMASK(5, 0)
117#define NPCM7XX_FAN_TIEN_TFIEN BIT(5)
118#define NPCM7XX_FAN_TIEN_TEIEN BIT(4)
119#define NPCM7XX_FAN_TIEN_TDIEN BIT(3)
120#define NPCM7XX_FAN_TIEN_TCIEN BIT(2)
121#define NPCM7XX_FAN_TIEN_TBIEN BIT(1)
122#define NPCM7XX_FAN_TIEN_TAIEN BIT(0)
123
124#define NPCM7XX_FAN_TICTRL_TFPND BIT(5)
125#define NPCM7XX_FAN_TICTRL_TEPND BIT(4)
126#define NPCM7XX_FAN_TICTRL_TDPND BIT(3)
127#define NPCM7XX_FAN_TICTRL_TCPND BIT(2)
128#define NPCM7XX_FAN_TICTRL_TBPND BIT(1)
129#define NPCM7XX_FAN_TICTRL_TAPND BIT(0)
130
131#define NPCM7XX_FAN_TCPCFG_HIBEN BIT(7)
132#define NPCM7XX_FAN_TCPCFG_EQBEN BIT(6)
133#define NPCM7XX_FAN_TCPCFG_LOBEN BIT(5)
134#define NPCM7XX_FAN_TCPCFG_CPBSEL BIT(4)
135#define NPCM7XX_FAN_TCPCFG_HIAEN BIT(3)
136#define NPCM7XX_FAN_TCPCFG_EQAEN BIT(2)
137#define NPCM7XX_FAN_TCPCFG_LOAEN BIT(1)
138#define NPCM7XX_FAN_TCPCFG_CPASEL BIT(0)
139
140/* FAN General Definition */
141/* Define the maximum FAN channel number */
142#define NPCM7XX_FAN_MAX_MODULE 8
143#define NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE 2
144#define NPCM7XX_FAN_MAX_CHN_NUM 16
145
146/*
147 * Get Fan Tach Timeout (base on clock 214843.75Hz, 1 cnt = 4.654us)
148 * Timeout 94ms ~= 0x5000
149 * (The minimum FAN speed could to support ~640RPM/pulse 1,
150 * 320RPM/pulse 2, ...-- 10.6Hz)
151 */
152#define NPCM7XX_FAN_TIMEOUT 0x5000
153#define NPCM7XX_FAN_TCNT 0xFFFF
154#define NPCM7XX_FAN_TCPA (NPCM7XX_FAN_TCNT - NPCM7XX_FAN_TIMEOUT)
155#define NPCM7XX_FAN_TCPB (NPCM7XX_FAN_TCNT - NPCM7XX_FAN_TIMEOUT)
156
157#define NPCM7XX_FAN_POLL_TIMER_200MS 200
158#define NPCM7XX_FAN_DEFAULT_PULSE_PER_REVOLUTION 2
159#define NPCM7XX_FAN_TINASEL_FANIN_DEFAULT 0
160#define NPCM7XX_FAN_CLK_PRESCALE 255
161
162#define NPCM7XX_FAN_CMPA 0
163#define NPCM7XX_FAN_CMPB 1
164
165/* Obtain the fan number */
166#define NPCM7XX_FAN_INPUT(fan, cmp) (((fan) << 1) + (cmp))
167
168/* fan sample status */
169#define FAN_DISABLE 0xFF
170#define FAN_INIT 0x00
171#define FAN_PREPARE_TO_GET_FIRST_CAPTURE 0x01
172#define FAN_ENOUGH_SAMPLE 0x02
173
174struct npcm_hwmon_info {
175 u32 pwm_max_channel;
176};
177
178struct npcm7xx_fan_dev {
179 u8 fan_st_flg;
180 u8 fan_pls_per_rev;
181 u16 fan_cnt;
182 u32 fan_cnt_tmp;
183};
184
185struct npcm7xx_cooling_device {
186 char name[THERMAL_NAME_LENGTH];
187 struct npcm7xx_pwm_fan_data *data;
188 struct thermal_cooling_device *tcdev;
189 int pwm_port;
190 u8 *cooling_levels;
191 u8 max_state;
192 u8 cur_state;
193};
194
195struct npcm7xx_pwm_fan_data {
196 void __iomem *pwm_base;
197 void __iomem *fan_base;
198 int pwm_modules;
199 struct clk *pwm_clk;
200 struct clk *fan_clk;
201 struct mutex pwm_lock[NPCM7XX_PWM_MAX_MODULES];
202 spinlock_t fan_lock[NPCM7XX_FAN_MAX_MODULE];
203 int fan_irq[NPCM7XX_FAN_MAX_MODULE];
204 bool pwm_present[NPCM7XX_PWM_MAX_CHN_NUM];
205 bool fan_present[NPCM7XX_FAN_MAX_CHN_NUM];
206 u32 input_clk_freq;
207 struct timer_list fan_timer;
208 struct npcm7xx_fan_dev fan_dev[NPCM7XX_FAN_MAX_CHN_NUM];
209 struct npcm7xx_cooling_device *cdev[NPCM7XX_PWM_MAX_CHN_NUM];
210 const struct npcm_hwmon_info *info;
211 u8 fan_select;
212};
213
214static int npcm7xx_pwm_config_set(struct npcm7xx_pwm_fan_data *data,
215 int channel, u16 val)
216{
217 u32 pwm_ch = (channel % NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
218 u32 module = (channel / NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
219 u32 tmp_buf, ctrl_en_bit, env_bit;
220
221 /*
222 * Config PWM Comparator register for setting duty cycle
223 */
224 mutex_lock(&data->pwm_lock[module]);
225
226 /* write new CMR value */
227 iowrite32(val, NPCM7XX_PWM_REG_CMRx(data->pwm_base, module, pwm_ch));
228 tmp_buf = ioread32(NPCM7XX_PWM_REG_CR(data->pwm_base, module));
229
230 switch (pwm_ch) {
231 case 0:
232 ctrl_en_bit = NPCM7XX_PWM_CTRL_CH0_EN_BIT;
233 env_bit = NPCM7XX_PWM_CTRL_CH0_INV_BIT;
234 break;
235 case 1:
236 ctrl_en_bit = NPCM7XX_PWM_CTRL_CH1_EN_BIT;
237 env_bit = NPCM7XX_PWM_CTRL_CH1_INV_BIT;
238 break;
239 case 2:
240 ctrl_en_bit = NPCM7XX_PWM_CTRL_CH2_EN_BIT;
241 env_bit = NPCM7XX_PWM_CTRL_CH2_INV_BIT;
242 break;
243 case 3:
244 ctrl_en_bit = NPCM7XX_PWM_CTRL_CH3_EN_BIT;
245 env_bit = NPCM7XX_PWM_CTRL_CH3_INV_BIT;
246 break;
247 default:
248 mutex_unlock(&data->pwm_lock[module]);
249 return -ENODEV;
250 }
251
252 if (val == 0) {
253 /* Disable PWM */
254 tmp_buf &= ~ctrl_en_bit;
255 tmp_buf |= env_bit;
256 } else {
257 /* Enable PWM */
258 tmp_buf |= ctrl_en_bit;
259 tmp_buf &= ~env_bit;
260 }
261
262 iowrite32(tmp_buf, NPCM7XX_PWM_REG_CR(data->pwm_base, module));
263 mutex_unlock(&data->pwm_lock[module]);
264
265 return 0;
266}
267
268static inline void npcm7xx_fan_start_capture(struct npcm7xx_pwm_fan_data *data,
269 u8 fan, u8 cmp)
270{
271 u8 fan_id;
272 u8 reg_mode;
273 u8 reg_int;
274 unsigned long flags;
275
276 fan_id = NPCM7XX_FAN_INPUT(fan, cmp);
277
278 /* to check whether any fan tach is enable */
279 if (data->fan_dev[fan_id].fan_st_flg != FAN_DISABLE) {
280 /* reset status */
281 spin_lock_irqsave(&data->fan_lock[fan], flags);
282
283 data->fan_dev[fan_id].fan_st_flg = FAN_INIT;
284 reg_int = ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
285
286 /*
287 * the interrupt enable bits do not need to be cleared before
288 * it sets, the interrupt enable bits are cleared only on reset.
289 * the clock unit control register is behaving in the same
290 * manner that the interrupt enable register behave.
291 */
292 if (cmp == NPCM7XX_FAN_CMPA) {
293 /* enable interrupt */
294 iowrite8(reg_int | (NPCM7XX_FAN_TIEN_TAIEN |
295 NPCM7XX_FAN_TIEN_TEIEN),
296 NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
297
298 reg_mode = NPCM7XX_FAN_TCKC_CLK1_APB
299 | ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base,
300 fan));
301
302 /* start to Capture */
303 iowrite8(reg_mode, NPCM7XX_FAN_REG_TCKC(data->fan_base,
304 fan));
305 } else {
306 /* enable interrupt */
307 iowrite8(reg_int | (NPCM7XX_FAN_TIEN_TBIEN |
308 NPCM7XX_FAN_TIEN_TFIEN),
309 NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
310
311 reg_mode =
312 NPCM7XX_FAN_TCKC_CLK2_APB
313 | ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base,
314 fan));
315
316 /* start to Capture */
317 iowrite8(reg_mode,
318 NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
319 }
320
321 spin_unlock_irqrestore(&data->fan_lock[fan], flags);
322 }
323}
324
325/*
326 * Enable a background timer to poll fan tach value, (200ms * 4)
327 * to polling all fan
328 */
329static void npcm7xx_fan_polling(struct timer_list *t)
330{
331 struct npcm7xx_pwm_fan_data *data;
332 int i;
333
334 data = from_timer(data, t, fan_timer);
335
336 /*
337 * Polling two module per one round,
338 * FAN01 & FAN89 / FAN23 & FAN1011 / FAN45 & FAN1213 / FAN67 & FAN1415
339 */
340 for (i = data->fan_select; i < NPCM7XX_FAN_MAX_MODULE;
341 i = i + 4) {
342 /* clear the flag and reset the counter (TCNT) */
343 iowrite8(NPCM7XX_FAN_TICLR_CLEAR_ALL,
344 NPCM7XX_FAN_REG_TICLR(data->fan_base, i));
345
346 if (data->fan_present[i * 2]) {
347 iowrite16(NPCM7XX_FAN_TCNT,
348 NPCM7XX_FAN_REG_TCNT1(data->fan_base, i));
349 npcm7xx_fan_start_capture(data, i, NPCM7XX_FAN_CMPA);
350 }
351 if (data->fan_present[(i * 2) + 1]) {
352 iowrite16(NPCM7XX_FAN_TCNT,
353 NPCM7XX_FAN_REG_TCNT2(data->fan_base, i));
354 npcm7xx_fan_start_capture(data, i, NPCM7XX_FAN_CMPB);
355 }
356 }
357
358 data->fan_select++;
359 data->fan_select &= 0x3;
360
361 /* reset the timer interval */
362 data->fan_timer.expires = jiffies +
363 msecs_to_jiffies(NPCM7XX_FAN_POLL_TIMER_200MS);
364 add_timer(&data->fan_timer);
365}
366
367static inline void npcm7xx_fan_compute(struct npcm7xx_pwm_fan_data *data,
368 u8 fan, u8 cmp, u8 fan_id, u8 flag_int,
369 u8 flag_mode, u8 flag_clear)
370{
371 u8 reg_int;
372 u8 reg_mode;
373 u16 fan_cap;
374
375 if (cmp == NPCM7XX_FAN_CMPA)
376 fan_cap = ioread16(NPCM7XX_FAN_REG_TCRA(data->fan_base, fan));
377 else
378 fan_cap = ioread16(NPCM7XX_FAN_REG_TCRB(data->fan_base, fan));
379
380 /* clear capature flag, H/W will auto reset the NPCM7XX_FAN_TCNTx */
381 iowrite8(flag_clear, NPCM7XX_FAN_REG_TICLR(data->fan_base, fan));
382
383 if (data->fan_dev[fan_id].fan_st_flg == FAN_INIT) {
384 /* First capture, drop it */
385 data->fan_dev[fan_id].fan_st_flg =
386 FAN_PREPARE_TO_GET_FIRST_CAPTURE;
387
388 /* reset counter */
389 data->fan_dev[fan_id].fan_cnt_tmp = 0;
390 } else if (data->fan_dev[fan_id].fan_st_flg < FAN_ENOUGH_SAMPLE) {
391 /*
392 * collect the enough sample,
393 * (ex: 2 pulse fan need to get 2 sample)
394 */
395 data->fan_dev[fan_id].fan_cnt_tmp +=
396 (NPCM7XX_FAN_TCNT - fan_cap);
397
398 data->fan_dev[fan_id].fan_st_flg++;
399 } else {
400 /* get enough sample or fan disable */
401 if (data->fan_dev[fan_id].fan_st_flg == FAN_ENOUGH_SAMPLE) {
402 data->fan_dev[fan_id].fan_cnt_tmp +=
403 (NPCM7XX_FAN_TCNT - fan_cap);
404
405 /* compute finial average cnt per pulse */
406 data->fan_dev[fan_id].fan_cnt =
407 data->fan_dev[fan_id].fan_cnt_tmp /
408 FAN_ENOUGH_SAMPLE;
409
410 data->fan_dev[fan_id].fan_st_flg = FAN_INIT;
411 }
412
413 reg_int = ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
414
415 /* disable interrupt */
416 iowrite8((reg_int & ~flag_int),
417 NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
418 reg_mode = ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
419
420 /* stop capturing */
421 iowrite8((reg_mode & ~flag_mode),
422 NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
423 }
424}
425
426static inline void npcm7xx_check_cmp(struct npcm7xx_pwm_fan_data *data,
427 u8 fan, u8 cmp, u8 flag)
428{
429 u8 reg_int;
430 u8 reg_mode;
431 u8 flag_timeout;
432 u8 flag_cap;
433 u8 flag_clear;
434 u8 flag_int;
435 u8 flag_mode;
436 u8 fan_id;
437
438 fan_id = NPCM7XX_FAN_INPUT(fan, cmp);
439
440 if (cmp == NPCM7XX_FAN_CMPA) {
441 flag_cap = NPCM7XX_FAN_TICTRL_TAPND;
442 flag_timeout = NPCM7XX_FAN_TICTRL_TEPND;
443 flag_int = NPCM7XX_FAN_TIEN_TAIEN | NPCM7XX_FAN_TIEN_TEIEN;
444 flag_mode = NPCM7XX_FAN_TCKC_CLK1_APB;
445 flag_clear = NPCM7XX_FAN_TICLR_TACLR | NPCM7XX_FAN_TICLR_TECLR;
446 } else {
447 flag_cap = NPCM7XX_FAN_TICTRL_TBPND;
448 flag_timeout = NPCM7XX_FAN_TICTRL_TFPND;
449 flag_int = NPCM7XX_FAN_TIEN_TBIEN | NPCM7XX_FAN_TIEN_TFIEN;
450 flag_mode = NPCM7XX_FAN_TCKC_CLK2_APB;
451 flag_clear = NPCM7XX_FAN_TICLR_TBCLR | NPCM7XX_FAN_TICLR_TFCLR;
452 }
453
454 if (flag & flag_timeout) {
455 reg_int = ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
456
457 /* disable interrupt */
458 iowrite8((reg_int & ~flag_int),
459 NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
460
461 /* clear interrupt flag */
462 iowrite8(flag_clear,
463 NPCM7XX_FAN_REG_TICLR(data->fan_base, fan));
464
465 reg_mode = ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
466
467 /* stop capturing */
468 iowrite8((reg_mode & ~flag_mode),
469 NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
470
471 /*
472 * If timeout occurs (NPCM7XX_FAN_TIMEOUT), the fan doesn't
473 * connect or speed is lower than 10.6Hz (320RPM/pulse2).
474 * In these situation, the RPM output should be zero.
475 */
476 data->fan_dev[fan_id].fan_cnt = 0;
477 } else {
478 /* input capture is occurred */
479 if (flag & flag_cap)
480 npcm7xx_fan_compute(data, fan, cmp, fan_id, flag_int,
481 flag_mode, flag_clear);
482 }
483}
484
485static irqreturn_t npcm7xx_fan_isr(int irq, void *dev_id)
486{
487 struct npcm7xx_pwm_fan_data *data = dev_id;
488 unsigned long flags;
489 int module;
490 u8 flag;
491
492 module = irq - data->fan_irq[0];
493 spin_lock_irqsave(&data->fan_lock[module], flags);
494
495 flag = ioread8(NPCM7XX_FAN_REG_TICTRL(data->fan_base, module));
496 if (flag > 0) {
497 npcm7xx_check_cmp(data, module, NPCM7XX_FAN_CMPA, flag);
498 npcm7xx_check_cmp(data, module, NPCM7XX_FAN_CMPB, flag);
499 spin_unlock_irqrestore(&data->fan_lock[module], flags);
500 return IRQ_HANDLED;
501 }
502
503 spin_unlock_irqrestore(&data->fan_lock[module], flags);
504
505 return IRQ_NONE;
506}
507
508static int npcm7xx_read_pwm(struct device *dev, u32 attr, int channel,
509 long *val)
510{
511 struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
512 u32 pmw_ch = (channel % NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
513 u32 module = (channel / NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
514
515 switch (attr) {
516 case hwmon_pwm_input:
517 *val = ioread32
518 (NPCM7XX_PWM_REG_CMRx(data->pwm_base, module, pmw_ch));
519 return 0;
520 default:
521 return -EOPNOTSUPP;
522 }
523}
524
525static int npcm7xx_write_pwm(struct device *dev, u32 attr, int channel,
526 long val)
527{
528 struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
529 int err;
530
531 switch (attr) {
532 case hwmon_pwm_input:
533 if (val < 0 || val > NPCM7XX_PWM_CMR_MAX)
534 return -EINVAL;
535 err = npcm7xx_pwm_config_set(data, channel, (u16)val);
536 break;
537 default:
538 err = -EOPNOTSUPP;
539 break;
540 }
541
542 return err;
543}
544
545static umode_t npcm7xx_pwm_is_visible(const void *_data, u32 attr, int channel)
546{
547 const struct npcm7xx_pwm_fan_data *data = _data;
548
549 if (!data->pwm_present[channel] || channel >= data->info->pwm_max_channel)
550 return 0;
551
552 switch (attr) {
553 case hwmon_pwm_input:
554 return 0644;
555 default:
556 return 0;
557 }
558}
559
560static int npcm7xx_read_fan(struct device *dev, u32 attr, int channel,
561 long *val)
562{
563 struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
564
565 switch (attr) {
566 case hwmon_fan_input:
567 *val = 0;
568 if (data->fan_dev[channel].fan_cnt <= 0)
569 return data->fan_dev[channel].fan_cnt;
570
571 /* Convert the raw reading to RPM */
572 if (data->fan_dev[channel].fan_cnt > 0 &&
573 data->fan_dev[channel].fan_pls_per_rev > 0)
574 *val = ((data->input_clk_freq * 60) /
575 (data->fan_dev[channel].fan_cnt *
576 data->fan_dev[channel].fan_pls_per_rev));
577 return 0;
578 default:
579 return -EOPNOTSUPP;
580 }
581}
582
583static umode_t npcm7xx_fan_is_visible(const void *_data, u32 attr, int channel)
584{
585 const struct npcm7xx_pwm_fan_data *data = _data;
586
587 if (!data->fan_present[channel])
588 return 0;
589
590 switch (attr) {
591 case hwmon_fan_input:
592 return 0444;
593 default:
594 return 0;
595 }
596}
597
598static int npcm7xx_read(struct device *dev, enum hwmon_sensor_types type,
599 u32 attr, int channel, long *val)
600{
601 switch (type) {
602 case hwmon_pwm:
603 return npcm7xx_read_pwm(dev, attr, channel, val);
604 case hwmon_fan:
605 return npcm7xx_read_fan(dev, attr, channel, val);
606 default:
607 return -EOPNOTSUPP;
608 }
609}
610
611static int npcm7xx_write(struct device *dev, enum hwmon_sensor_types type,
612 u32 attr, int channel, long val)
613{
614 switch (type) {
615 case hwmon_pwm:
616 return npcm7xx_write_pwm(dev, attr, channel, val);
617 default:
618 return -EOPNOTSUPP;
619 }
620}
621
622static umode_t npcm7xx_is_visible(const void *data,
623 enum hwmon_sensor_types type,
624 u32 attr, int channel)
625{
626 switch (type) {
627 case hwmon_pwm:
628 return npcm7xx_pwm_is_visible(data, attr, channel);
629 case hwmon_fan:
630 return npcm7xx_fan_is_visible(data, attr, channel);
631 default:
632 return 0;
633 }
634}
635
636static const struct hwmon_channel_info * const npcm7xx_info[] = {
637 HWMON_CHANNEL_INFO(pwm,
638 HWMON_PWM_INPUT,
639 HWMON_PWM_INPUT,
640 HWMON_PWM_INPUT,
641 HWMON_PWM_INPUT,
642 HWMON_PWM_INPUT,
643 HWMON_PWM_INPUT,
644 HWMON_PWM_INPUT,
645 HWMON_PWM_INPUT,
646 HWMON_PWM_INPUT,
647 HWMON_PWM_INPUT,
648 HWMON_PWM_INPUT,
649 HWMON_PWM_INPUT),
650 HWMON_CHANNEL_INFO(fan,
651 HWMON_F_INPUT,
652 HWMON_F_INPUT,
653 HWMON_F_INPUT,
654 HWMON_F_INPUT,
655 HWMON_F_INPUT,
656 HWMON_F_INPUT,
657 HWMON_F_INPUT,
658 HWMON_F_INPUT,
659 HWMON_F_INPUT,
660 HWMON_F_INPUT,
661 HWMON_F_INPUT,
662 HWMON_F_INPUT,
663 HWMON_F_INPUT,
664 HWMON_F_INPUT,
665 HWMON_F_INPUT,
666 HWMON_F_INPUT),
667 NULL
668};
669
670static const struct hwmon_ops npcm7xx_hwmon_ops = {
671 .is_visible = npcm7xx_is_visible,
672 .read = npcm7xx_read,
673 .write = npcm7xx_write,
674};
675
676static const struct hwmon_chip_info npcm7xx_chip_info = {
677 .ops = &npcm7xx_hwmon_ops,
678 .info = npcm7xx_info,
679};
680
681static const struct npcm_hwmon_info npxm7xx_hwmon_info = {
682 .pwm_max_channel = 8,
683};
684
685static const struct npcm_hwmon_info npxm8xx_hwmon_info = {
686 .pwm_max_channel = 12,
687};
688
689static u32 npcm7xx_pwm_init(struct npcm7xx_pwm_fan_data *data)
690{
691 int m, ch;
692 u32 prescale_val, output_freq;
693 unsigned long pwm_clk_freq;
694
695 pwm_clk_freq = clk_get_rate(data->pwm_clk);
696
697 /* Adjust NPCM7xx PWMs output frequency to ~25Khz */
698 output_freq = pwm_clk_freq / PWN_CNT_DEFAULT;
699 prescale_val = DIV_ROUND_CLOSEST(output_freq, PWM_OUTPUT_FREQ_25KHZ);
700
701 /* If prescale_val = 0, then the prescale output clock is stopped */
702 if (prescale_val < MIN_PRESCALE1)
703 prescale_val = MIN_PRESCALE1;
704 /*
705 * prescale_val need to decrement in one because in the PWM Prescale
706 * register the Prescale value increment by one
707 */
708 prescale_val--;
709
710 /* Setting PWM Prescale Register value register to both modules */
711 prescale_val |= (prescale_val << NPCM7XX_PWM_PRESCALE_SHIFT_CH01);
712
713 for (m = 0; m < data->pwm_modules; m++) {
714 iowrite32(prescale_val, NPCM7XX_PWM_REG_PR(data->pwm_base, m));
715 iowrite32(NPCM7XX_PWM_PRESCALE2_DEFAULT,
716 NPCM7XX_PWM_REG_CSR(data->pwm_base, m));
717 iowrite32(NPCM7XX_PWM_CTRL_MODE_DEFAULT,
718 NPCM7XX_PWM_REG_CR(data->pwm_base, m));
719
720 for (ch = 0; ch < NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE; ch++) {
721 iowrite32(NPCM7XX_PWM_COUNTER_DEFAULT_NUM,
722 NPCM7XX_PWM_REG_CNRx(data->pwm_base, m, ch));
723 }
724 }
725
726 return output_freq / ((prescale_val & 0xf) + 1);
727}
728
729static void npcm7xx_fan_init(struct npcm7xx_pwm_fan_data *data)
730{
731 int md;
732 int ch;
733 int i;
734 u32 apb_clk_freq;
735
736 for (md = 0; md < NPCM7XX_FAN_MAX_MODULE; md++) {
737 /* stop FAN0~7 clock */
738 iowrite8(NPCM7XX_FAN_TCKC_CLKX_NONE,
739 NPCM7XX_FAN_REG_TCKC(data->fan_base, md));
740
741 /* disable all interrupt */
742 iowrite8(0x00, NPCM7XX_FAN_REG_TIEN(data->fan_base, md));
743
744 /* clear all interrupt */
745 iowrite8(NPCM7XX_FAN_TICLR_CLEAR_ALL,
746 NPCM7XX_FAN_REG_TICLR(data->fan_base, md));
747
748 /* set FAN0~7 clock prescaler */
749 iowrite8(NPCM7XX_FAN_CLK_PRESCALE,
750 NPCM7XX_FAN_REG_TPRSC(data->fan_base, md));
751
752 /* set FAN0~7 mode (high-to-low transition) */
753 iowrite8((NPCM7XX_FAN_TMCTRL_MODE_5 | NPCM7XX_FAN_TMCTRL_TBEN |
754 NPCM7XX_FAN_TMCTRL_TAEN),
755 NPCM7XX_FAN_REG_TMCTRL(data->fan_base, md));
756
757 /* set FAN0~7 Initial Count/Cap */
758 iowrite16(NPCM7XX_FAN_TCNT,
759 NPCM7XX_FAN_REG_TCNT1(data->fan_base, md));
760 iowrite16(NPCM7XX_FAN_TCNT,
761 NPCM7XX_FAN_REG_TCNT2(data->fan_base, md));
762
763 /* set FAN0~7 compare (equal to count) */
764 iowrite8((NPCM7XX_FAN_TCPCFG_EQAEN | NPCM7XX_FAN_TCPCFG_EQBEN),
765 NPCM7XX_FAN_REG_TCPCFG(data->fan_base, md));
766
767 /* set FAN0~7 compare value */
768 iowrite16(NPCM7XX_FAN_TCPA,
769 NPCM7XX_FAN_REG_TCPA(data->fan_base, md));
770 iowrite16(NPCM7XX_FAN_TCPB,
771 NPCM7XX_FAN_REG_TCPB(data->fan_base, md));
772
773 /* set FAN0~7 fan input FANIN 0~15 */
774 iowrite8(NPCM7XX_FAN_TINASEL_FANIN_DEFAULT,
775 NPCM7XX_FAN_REG_TINASEL(data->fan_base, md));
776 iowrite8(NPCM7XX_FAN_TINASEL_FANIN_DEFAULT,
777 NPCM7XX_FAN_REG_TINBSEL(data->fan_base, md));
778
779 for (i = 0; i < NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE; i++) {
780 ch = md * NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE + i;
781 data->fan_dev[ch].fan_st_flg = FAN_DISABLE;
782 data->fan_dev[ch].fan_pls_per_rev =
783 NPCM7XX_FAN_DEFAULT_PULSE_PER_REVOLUTION;
784 data->fan_dev[ch].fan_cnt = 0;
785 }
786 }
787
788 apb_clk_freq = clk_get_rate(data->fan_clk);
789
790 /* Fan tach input clock = APB clock / prescalar, default is 255. */
791 data->input_clk_freq = apb_clk_freq / (NPCM7XX_FAN_CLK_PRESCALE + 1);
792}
793
794static int
795npcm7xx_pwm_cz_get_max_state(struct thermal_cooling_device *tcdev,
796 unsigned long *state)
797{
798 struct npcm7xx_cooling_device *cdev = tcdev->devdata;
799
800 *state = cdev->max_state;
801
802 return 0;
803}
804
805static int
806npcm7xx_pwm_cz_get_cur_state(struct thermal_cooling_device *tcdev,
807 unsigned long *state)
808{
809 struct npcm7xx_cooling_device *cdev = tcdev->devdata;
810
811 *state = cdev->cur_state;
812
813 return 0;
814}
815
816static int
817npcm7xx_pwm_cz_set_cur_state(struct thermal_cooling_device *tcdev,
818 unsigned long state)
819{
820 struct npcm7xx_cooling_device *cdev = tcdev->devdata;
821 int ret;
822
823 if (state > cdev->max_state)
824 return -EINVAL;
825
826 cdev->cur_state = state;
827 ret = npcm7xx_pwm_config_set(cdev->data, cdev->pwm_port,
828 cdev->cooling_levels[cdev->cur_state]);
829
830 return ret;
831}
832
833static const struct thermal_cooling_device_ops npcm7xx_pwm_cool_ops = {
834 .get_max_state = npcm7xx_pwm_cz_get_max_state,
835 .get_cur_state = npcm7xx_pwm_cz_get_cur_state,
836 .set_cur_state = npcm7xx_pwm_cz_set_cur_state,
837};
838
839static int npcm7xx_create_pwm_cooling(struct device *dev,
840 struct device_node *child,
841 struct npcm7xx_pwm_fan_data *data,
842 u32 pwm_port, u8 num_levels)
843{
844 int ret;
845 struct npcm7xx_cooling_device *cdev;
846
847 cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
848 if (!cdev)
849 return -ENOMEM;
850
851 cdev->cooling_levels = devm_kzalloc(dev, num_levels, GFP_KERNEL);
852 if (!cdev->cooling_levels)
853 return -ENOMEM;
854
855 cdev->max_state = num_levels - 1;
856 ret = of_property_read_u8_array(child, "cooling-levels",
857 cdev->cooling_levels,
858 num_levels);
859 if (ret) {
860 dev_err(dev, "Property 'cooling-levels' cannot be read.\n");
861 return ret;
862 }
863 snprintf(cdev->name, THERMAL_NAME_LENGTH, "%pOFn%d", child,
864 pwm_port);
865
866 cdev->tcdev = devm_thermal_of_cooling_device_register(dev, child,
867 cdev->name, cdev, &npcm7xx_pwm_cool_ops);
868 if (IS_ERR(cdev->tcdev))
869 return PTR_ERR(cdev->tcdev);
870
871 cdev->data = data;
872 cdev->pwm_port = pwm_port;
873
874 data->cdev[pwm_port] = cdev;
875
876 return 0;
877}
878
879static int npcm7xx_en_pwm_fan(struct device *dev,
880 struct device_node *child,
881 struct npcm7xx_pwm_fan_data *data)
882{
883 u8 *fan_ch;
884 u32 pwm_port;
885 int ret, fan_cnt;
886 u8 index, ch;
887
888 ret = of_property_read_u32(child, "reg", &pwm_port);
889 if (ret)
890 return ret;
891
892 data->pwm_present[pwm_port] = true;
893 ret = npcm7xx_pwm_config_set(data, pwm_port,
894 NPCM7XX_PWM_CMR_DEFAULT_NUM);
895 if (ret)
896 return ret;
897
898 ret = of_property_count_u8_elems(child, "cooling-levels");
899 if (ret > 0) {
900 ret = npcm7xx_create_pwm_cooling(dev, child, data, pwm_port,
901 ret);
902 if (ret)
903 return ret;
904 }
905
906 fan_cnt = of_property_count_u8_elems(child, "fan-tach-ch");
907 if (fan_cnt < 1)
908 return -EINVAL;
909
910 fan_ch = devm_kcalloc(dev, fan_cnt, sizeof(*fan_ch), GFP_KERNEL);
911 if (!fan_ch)
912 return -ENOMEM;
913
914 ret = of_property_read_u8_array(child, "fan-tach-ch", fan_ch, fan_cnt);
915 if (ret)
916 return ret;
917
918 for (ch = 0; ch < fan_cnt; ch++) {
919 index = fan_ch[ch];
920 data->fan_present[index] = true;
921 data->fan_dev[index].fan_st_flg = FAN_INIT;
922 }
923
924 return 0;
925}
926
927static int npcm7xx_pwm_fan_probe(struct platform_device *pdev)
928{
929 struct device *dev = &pdev->dev;
930 struct device_node *np;
931 struct npcm7xx_pwm_fan_data *data;
932 struct resource *res;
933 struct device *hwmon;
934 char name[20];
935 int ret, cnt;
936 u32 output_freq;
937 u32 i;
938
939 np = dev->of_node;
940
941 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
942 if (!data)
943 return -ENOMEM;
944
945 data->info = device_get_match_data(dev);
946 if (!data->info)
947 return -EINVAL;
948
949 data->pwm_modules = data->info->pwm_max_channel / NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE;
950
951 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm");
952 if (!res) {
953 dev_err(dev, "pwm resource not found\n");
954 return -ENODEV;
955 }
956
957 data->pwm_base = devm_ioremap_resource(dev, res);
958 dev_dbg(dev, "pwm base resource is %pR\n", res);
959 if (IS_ERR(data->pwm_base))
960 return PTR_ERR(data->pwm_base);
961
962 data->pwm_clk = devm_clk_get(dev, "pwm");
963 if (IS_ERR(data->pwm_clk)) {
964 dev_err(dev, "couldn't get pwm clock\n");
965 return PTR_ERR(data->pwm_clk);
966 }
967
968 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fan");
969 if (!res) {
970 dev_err(dev, "fan resource not found\n");
971 return -ENODEV;
972 }
973
974 data->fan_base = devm_ioremap_resource(dev, res);
975 dev_dbg(dev, "fan base resource is %pR\n", res);
976 if (IS_ERR(data->fan_base))
977 return PTR_ERR(data->fan_base);
978
979 data->fan_clk = devm_clk_get(dev, "fan");
980 if (IS_ERR(data->fan_clk)) {
981 dev_err(dev, "couldn't get fan clock\n");
982 return PTR_ERR(data->fan_clk);
983 }
984
985 output_freq = npcm7xx_pwm_init(data);
986 npcm7xx_fan_init(data);
987
988 for (cnt = 0; cnt < data->pwm_modules; cnt++)
989 mutex_init(&data->pwm_lock[cnt]);
990
991 for (i = 0; i < NPCM7XX_FAN_MAX_MODULE; i++) {
992 spin_lock_init(&data->fan_lock[i]);
993
994 data->fan_irq[i] = platform_get_irq(pdev, i);
995 if (data->fan_irq[i] < 0)
996 return data->fan_irq[i];
997
998 sprintf(name, "NPCM7XX-FAN-MD%d", i);
999 ret = devm_request_irq(dev, data->fan_irq[i], npcm7xx_fan_isr,
1000 0, name, (void *)data);
1001 if (ret) {
1002 dev_err(dev, "register IRQ fan%d failed\n", i);
1003 return ret;
1004 }
1005 }
1006
1007 for_each_child_of_node_scoped(np, child) {
1008 ret = npcm7xx_en_pwm_fan(dev, child, data);
1009 if (ret) {
1010 dev_err(dev, "enable pwm and fan failed\n");
1011 return ret;
1012 }
1013 }
1014
1015 hwmon = devm_hwmon_device_register_with_info(dev, "npcm7xx_pwm_fan",
1016 data, &npcm7xx_chip_info,
1017 NULL);
1018 if (IS_ERR(hwmon)) {
1019 dev_err(dev, "unable to register hwmon device\n");
1020 return PTR_ERR(hwmon);
1021 }
1022
1023 for (i = 0; i < NPCM7XX_FAN_MAX_CHN_NUM; i++) {
1024 if (data->fan_present[i]) {
1025 /* fan timer initialization */
1026 data->fan_timer.expires = jiffies +
1027 msecs_to_jiffies(NPCM7XX_FAN_POLL_TIMER_200MS);
1028 timer_setup(&data->fan_timer,
1029 npcm7xx_fan_polling, 0);
1030 add_timer(&data->fan_timer);
1031 break;
1032 }
1033 }
1034
1035 pr_info("NPCM7XX PWM-FAN Driver probed, output Freq %dHz[PWM], input Freq %dHz[FAN]\n",
1036 output_freq, data->input_clk_freq);
1037
1038 return 0;
1039}
1040
1041static const struct of_device_id of_pwm_fan_match_table[] = {
1042 { .compatible = "nuvoton,npcm750-pwm-fan", .data = &npxm7xx_hwmon_info},
1043 { .compatible = "nuvoton,npcm845-pwm-fan", .data = &npxm8xx_hwmon_info},
1044 {},
1045};
1046MODULE_DEVICE_TABLE(of, of_pwm_fan_match_table);
1047
1048static struct platform_driver npcm7xx_pwm_fan_driver = {
1049 .probe = npcm7xx_pwm_fan_probe,
1050 .driver = {
1051 .name = "npcm7xx_pwm_fan",
1052 .of_match_table = of_pwm_fan_match_table,
1053 },
1054};
1055
1056module_platform_driver(npcm7xx_pwm_fan_driver);
1057
1058MODULE_DESCRIPTION("Nuvoton NPCM7XX PWM and Fan Tacho driver");
1059MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
1060MODULE_LICENSE("GPL v2");