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Merge tag 'mfd-fixes-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
[linux-2.6-block.git] / drivers / hwmon / aspeed-pwm-tacho.c
CommitLineData
3a63cbb8 1// SPDX-License-Identifier: GPL-2.0-or-later
2d7a548a
JRN		 2/*
3 * Copyright (c) 2016 Google, Inc
2d7a548a
JRN		 4 */
5
6#include <linux/clk.h>
54b943e6 7#include <linux/delay.h>
7ed1c5e5 8#include <linux/errno.h>
2d7a548a 9#include <linux/gpio/consumer.h>
2d7a548a
JRN		 10#include <linux/hwmon.h>
11#include <linux/hwmon-sysfs.h>
12#include <linux/io.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
2d7a548a 15#include <linux/of_device.h>
54b943e6 16#include <linux/of_platform.h>
2d7a548a 17#include <linux/platform_device.h>
2d7a548a 18#include <linux/regmap.h>
18c514cc 19#include <linux/reset.h>
54b943e6 20#include <linux/sysfs.h>
f198907d 21#include <linux/thermal.h>
2d7a548a
JRN		 22
23/* ASPEED PWM & FAN Tach Register Definition */
24#define ASPEED_PTCR_CTRL 0x00
25#define ASPEED_PTCR_CLK_CTRL 0x04
26#define ASPEED_PTCR_DUTY0_CTRL 0x08
27#define ASPEED_PTCR_DUTY1_CTRL 0x0c
28#define ASPEED_PTCR_TYPEM_CTRL 0x10
29#define ASPEED_PTCR_TYPEM_CTRL1 0x14
30#define ASPEED_PTCR_TYPEN_CTRL 0x18
31#define ASPEED_PTCR_TYPEN_CTRL1 0x1c
32#define ASPEED_PTCR_TACH_SOURCE 0x20
33#define ASPEED_PTCR_TRIGGER 0x28
34#define ASPEED_PTCR_RESULT 0x2c
35#define ASPEED_PTCR_INTR_CTRL 0x30
36#define ASPEED_PTCR_INTR_STS 0x34
37#define ASPEED_PTCR_TYPEM_LIMIT 0x38
38#define ASPEED_PTCR_TYPEN_LIMIT 0x3C
39#define ASPEED_PTCR_CTRL_EXT 0x40
40#define ASPEED_PTCR_CLK_CTRL_EXT 0x44
41#define ASPEED_PTCR_DUTY2_CTRL 0x48
42#define ASPEED_PTCR_DUTY3_CTRL 0x4c
43#define ASPEED_PTCR_TYPEO_CTRL 0x50
44#define ASPEED_PTCR_TYPEO_CTRL1 0x54
45#define ASPEED_PTCR_TACH_SOURCE_EXT 0x60
46#define ASPEED_PTCR_TYPEO_LIMIT 0x78
47
48/* ASPEED_PTCR_CTRL : 0x00 - General Control Register */
49#define ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART1 15
50#define ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART2 6
51#define ASPEED_PTCR_CTRL_SET_PWMD_TYPE_MASK (BIT(7) | BIT(15))
52
53#define ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART1 14
54#define ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART2 5
55#define ASPEED_PTCR_CTRL_SET_PWMC_TYPE_MASK (BIT(6) | BIT(14))
56
57#define ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART1 13
58#define ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART2 4
59#define ASPEED_PTCR_CTRL_SET_PWMB_TYPE_MASK (BIT(5) | BIT(13))
60
61#define ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART1 12
62#define ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART2 3
63#define ASPEED_PTCR_CTRL_SET_PWMA_TYPE_MASK (BIT(4) | BIT(12))
64
65#define ASPEED_PTCR_CTRL_FAN_NUM_EN(x) BIT(16 + (x))
66
67#define ASPEED_PTCR_CTRL_PWMD_EN BIT(11)
68#define ASPEED_PTCR_CTRL_PWMC_EN BIT(10)
69#define ASPEED_PTCR_CTRL_PWMB_EN BIT(9)
70#define ASPEED_PTCR_CTRL_PWMA_EN BIT(8)
71
72#define ASPEED_PTCR_CTRL_CLK_SRC BIT(1)
73#define ASPEED_PTCR_CTRL_CLK_EN BIT(0)
74
75/* ASPEED_PTCR_CLK_CTRL : 0x04 - Clock Control Register */
76/* TYPE N */
77#define ASPEED_PTCR_CLK_CTRL_TYPEN_MASK GENMASK(31, 16)
78#define ASPEED_PTCR_CLK_CTRL_TYPEN_UNIT 24
79#define ASPEED_PTCR_CLK_CTRL_TYPEN_H 20
80#define ASPEED_PTCR_CLK_CTRL_TYPEN_L 16
81/* TYPE M */
82#define ASPEED_PTCR_CLK_CTRL_TYPEM_MASK GENMASK(15, 0)
83#define ASPEED_PTCR_CLK_CTRL_TYPEM_UNIT 8
84#define ASPEED_PTCR_CLK_CTRL_TYPEM_H 4
85#define ASPEED_PTCR_CLK_CTRL_TYPEM_L 0
86
87/*
88 * ASPEED_PTCR_DUTY_CTRL/1/2/3 : 0x08/0x0C/0x48/0x4C - PWM-FAN duty control
89 * 0/1/2/3 register
90 */
91#define DUTY_CTRL_PWM2_FALL_POINT 24
92#define DUTY_CTRL_PWM2_RISE_POINT 16
93#define DUTY_CTRL_PWM2_RISE_FALL_MASK GENMASK(31, 16)
94#define DUTY_CTRL_PWM1_FALL_POINT 8
95#define DUTY_CTRL_PWM1_RISE_POINT 0
96#define DUTY_CTRL_PWM1_RISE_FALL_MASK GENMASK(15, 0)
97
98/* ASPEED_PTCR_TYPEM_CTRL : 0x10/0x18/0x50 - Type M/N/O Ctrl 0 Register */
99#define TYPE_CTRL_FAN_MASK (GENMASK(5, 1) | GENMASK(31, 16))
100#define TYPE_CTRL_FAN1_MASK GENMASK(31, 0)
101#define TYPE_CTRL_FAN_PERIOD 16
102#define TYPE_CTRL_FAN_MODE 4
103#define TYPE_CTRL_FAN_DIVISION 1
104#define TYPE_CTRL_FAN_TYPE_EN 1
105
106/* ASPEED_PTCR_TACH_SOURCE : 0x20/0x60 - Tach Source Register */
107/* bit [0,1] at 0x20, bit [2] at 0x60 */
108#define TACH_PWM_SOURCE_BIT01(x) ((x) * 2)
109#define TACH_PWM_SOURCE_BIT2(x) ((x) * 2)
110#define TACH_PWM_SOURCE_MASK_BIT01(x) (0x3 << ((x) * 2))
111#define TACH_PWM_SOURCE_MASK_BIT2(x) BIT((x) * 2)
112
113/* ASPEED_PTCR_RESULT : 0x2c - Result Register */
114#define RESULT_STATUS_MASK BIT(31)
115#define RESULT_VALUE_MASK 0xfffff
116
117/* ASPEED_PTCR_CTRL_EXT : 0x40 - General Control Extension #1 Register */
118#define ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART1 15
119#define ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART2 6
120#define ASPEED_PTCR_CTRL_SET_PWMH_TYPE_MASK (BIT(7) | BIT(15))
121
122#define ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART1 14
123#define ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART2 5
124#define ASPEED_PTCR_CTRL_SET_PWMG_TYPE_MASK (BIT(6) | BIT(14))
125
126#define ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART1 13
127#define ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART2 4
128#define ASPEED_PTCR_CTRL_SET_PWMF_TYPE_MASK (BIT(5) | BIT(13))
129
130#define ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART1 12
131#define ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART2 3
132#define ASPEED_PTCR_CTRL_SET_PWME_TYPE_MASK (BIT(4) | BIT(12))
133
134#define ASPEED_PTCR_CTRL_PWMH_EN BIT(11)
135#define ASPEED_PTCR_CTRL_PWMG_EN BIT(10)
136#define ASPEED_PTCR_CTRL_PWMF_EN BIT(9)
137#define ASPEED_PTCR_CTRL_PWME_EN BIT(8)
138
139/* ASPEED_PTCR_CLK_EXT_CTRL : 0x44 - Clock Control Extension #1 Register */
140/* TYPE O */
141#define ASPEED_PTCR_CLK_CTRL_TYPEO_MASK GENMASK(15, 0)
142#define ASPEED_PTCR_CLK_CTRL_TYPEO_UNIT 8
143#define ASPEED_PTCR_CLK_CTRL_TYPEO_H 4
144#define ASPEED_PTCR_CLK_CTRL_TYPEO_L 0
145
146#define PWM_MAX 255
147
1e276292
PV		 148#define BOTH_EDGES 0x02 /* 10b */
149
2d7a548a
JRN		 150#define M_PWM_DIV_H 0x00
151#define M_PWM_DIV_L 0x05
152#define M_PWM_PERIOD 0x5F
153#define M_TACH_CLK_DIV 0x00
1e276292
PV		 154/*
155 * 5:4 Type N fan tach mode selection bit:
156 * 00: falling
157 * 01: rising
158 * 10: both
159 * 11: reserved.
160 */
161#define M_TACH_MODE 0x02 /* 10b */
762b1e88 162#define M_TACH_UNIT 0x0210
2d7a548a
JRN		 163#define INIT_FAN_CTRL 0xFF
164
44b41366
PV		 165/* How long we sleep in us while waiting for an RPM result. */
166#define ASPEED_RPM_STATUS_SLEEP_USEC 500
167
f198907d
MK		 168#define MAX_CDEV_NAME_LEN 16
169
170struct aspeed_cooling_device {
171 char name[16];
172 struct aspeed_pwm_tacho_data *priv;
173 struct thermal_cooling_device *tcdev;
174 int pwm_port;
175 u8 *cooling_levels;
176 u8 max_state;
177 u8 cur_state;
178};
179
2d7a548a
JRN		 180struct aspeed_pwm_tacho_data {
181 struct regmap *regmap;
18c514cc 182 struct reset_control *rst;
2d7a548a
JRN		 183 unsigned long clk_freq;
184 bool pwm_present[8];
185 bool fan_tach_present[16];
186 u8 type_pwm_clock_unit[3];
187 u8 type_pwm_clock_division_h[3];
188 u8 type_pwm_clock_division_l[3];
189 u8 type_fan_tach_clock_division[3];
1e276292 190 u8 type_fan_tach_mode[3];
2d7a548a
JRN		 191 u16 type_fan_tach_unit[3];
192 u8 pwm_port_type[8];
193 u8 pwm_port_fan_ctrl[8];
194 u8 fan_tach_ch_source[16];
f198907d 195 struct aspeed_cooling_device *cdev[8];
2d7a548a
JRN		 196 const struct attribute_group *groups[3];
197};
198
199enum type { TYPEM, TYPEN, TYPEO };
200
201struct type_params {
202 u32 l_value;
203 u32 h_value;
204 u32 unit_value;
205 u32 clk_ctrl_mask;
206 u32 clk_ctrl_reg;
207 u32 ctrl_reg;
208 u32 ctrl_reg1;
209};
210
211static const struct type_params type_params[] = {
212 [TYPEM] = {
213 .l_value = ASPEED_PTCR_CLK_CTRL_TYPEM_L,
214 .h_value = ASPEED_PTCR_CLK_CTRL_TYPEM_H,
215 .unit_value = ASPEED_PTCR_CLK_CTRL_TYPEM_UNIT,
216 .clk_ctrl_mask = ASPEED_PTCR_CLK_CTRL_TYPEM_MASK,
217 .clk_ctrl_reg = ASPEED_PTCR_CLK_CTRL,
218 .ctrl_reg = ASPEED_PTCR_TYPEM_CTRL,
219 .ctrl_reg1 = ASPEED_PTCR_TYPEM_CTRL1,
220 },
221 [TYPEN] = {
222 .l_value = ASPEED_PTCR_CLK_CTRL_TYPEN_L,
223 .h_value = ASPEED_PTCR_CLK_CTRL_TYPEN_H,
224 .unit_value = ASPEED_PTCR_CLK_CTRL_TYPEN_UNIT,
225 .clk_ctrl_mask = ASPEED_PTCR_CLK_CTRL_TYPEN_MASK,
226 .clk_ctrl_reg = ASPEED_PTCR_CLK_CTRL,
227 .ctrl_reg = ASPEED_PTCR_TYPEN_CTRL,
228 .ctrl_reg1 = ASPEED_PTCR_TYPEN_CTRL1,
229 },
230 [TYPEO] = {
231 .l_value = ASPEED_PTCR_CLK_CTRL_TYPEO_L,
232 .h_value = ASPEED_PTCR_CLK_CTRL_TYPEO_H,
233 .unit_value = ASPEED_PTCR_CLK_CTRL_TYPEO_UNIT,
234 .clk_ctrl_mask = ASPEED_PTCR_CLK_CTRL_TYPEO_MASK,
235 .clk_ctrl_reg = ASPEED_PTCR_CLK_CTRL_EXT,
236 .ctrl_reg = ASPEED_PTCR_TYPEO_CTRL,
237 .ctrl_reg1 = ASPEED_PTCR_TYPEO_CTRL1,
238 }
239};
240
241enum pwm_port { PWMA, PWMB, PWMC, PWMD, PWME, PWMF, PWMG, PWMH };
242
243struct pwm_port_params {
244 u32 pwm_en;
245 u32 ctrl_reg;
246 u32 type_part1;
247 u32 type_part2;
248 u32 type_mask;
249 u32 duty_ctrl_rise_point;
250 u32 duty_ctrl_fall_point;
251 u32 duty_ctrl_reg;
252 u32 duty_ctrl_rise_fall_mask;
253};
254
255static const struct pwm_port_params pwm_port_params[] = {
256 [PWMA] = {
257 .pwm_en = ASPEED_PTCR_CTRL_PWMA_EN,
258 .ctrl_reg = ASPEED_PTCR_CTRL,
259 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART1,
260 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMA_TYPE_PART2,
261 .type_mask = ASPEED_PTCR_CTRL_SET_PWMA_TYPE_MASK,
262 .duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
263 .duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
264 .duty_ctrl_reg = ASPEED_PTCR_DUTY0_CTRL,
265 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
266 },
267 [PWMB] = {
268 .pwm_en = ASPEED_PTCR_CTRL_PWMB_EN,
269 .ctrl_reg = ASPEED_PTCR_CTRL,
270 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART1,
271 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMB_TYPE_PART2,
272 .type_mask = ASPEED_PTCR_CTRL_SET_PWMB_TYPE_MASK,
273 .duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
274 .duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
275 .duty_ctrl_reg = ASPEED_PTCR_DUTY0_CTRL,
276 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
277 },
278 [PWMC] = {
279 .pwm_en = ASPEED_PTCR_CTRL_PWMC_EN,
280 .ctrl_reg = ASPEED_PTCR_CTRL,
281 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART1,
282 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMC_TYPE_PART2,
283 .type_mask = ASPEED_PTCR_CTRL_SET_PWMC_TYPE_MASK,
284 .duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
285 .duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
286 .duty_ctrl_reg = ASPEED_PTCR_DUTY1_CTRL,
287 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
288 },
289 [PWMD] = {
290 .pwm_en = ASPEED_PTCR_CTRL_PWMD_EN,
291 .ctrl_reg = ASPEED_PTCR_CTRL,
292 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART1,
293 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMD_TYPE_PART2,
294 .type_mask = ASPEED_PTCR_CTRL_SET_PWMD_TYPE_MASK,
295 .duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
296 .duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
297 .duty_ctrl_reg = ASPEED_PTCR_DUTY1_CTRL,
298 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
299 },
300 [PWME] = {
301 .pwm_en = ASPEED_PTCR_CTRL_PWME_EN,
302 .ctrl_reg = ASPEED_PTCR_CTRL_EXT,
303 .type_part1 = ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART1,
304 .type_part2 = ASPEED_PTCR_CTRL_SET_PWME_TYPE_PART2,
305 .type_mask = ASPEED_PTCR_CTRL_SET_PWME_TYPE_MASK,
306 .duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
307 .duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
308 .duty_ctrl_reg = ASPEED_PTCR_DUTY2_CTRL,
309 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
310 },
311 [PWMF] = {
312 .pwm_en = ASPEED_PTCR_CTRL_PWMF_EN,
313 .ctrl_reg = ASPEED_PTCR_CTRL_EXT,
314 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART1,
315 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMF_TYPE_PART2,
316 .type_mask = ASPEED_PTCR_CTRL_SET_PWMF_TYPE_MASK,
317 .duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
318 .duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
319 .duty_ctrl_reg = ASPEED_PTCR_DUTY2_CTRL,
320 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
321 },
322 [PWMG] = {
323 .pwm_en = ASPEED_PTCR_CTRL_PWMG_EN,
324 .ctrl_reg = ASPEED_PTCR_CTRL_EXT,
325 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART1,
326 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMG_TYPE_PART2,
327 .type_mask = ASPEED_PTCR_CTRL_SET_PWMG_TYPE_MASK,
328 .duty_ctrl_rise_point = DUTY_CTRL_PWM1_RISE_POINT,
329 .duty_ctrl_fall_point = DUTY_CTRL_PWM1_FALL_POINT,
330 .duty_ctrl_reg = ASPEED_PTCR_DUTY3_CTRL,
331 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM1_RISE_FALL_MASK,
332 },
333 [PWMH] = {
334 .pwm_en = ASPEED_PTCR_CTRL_PWMH_EN,
335 .ctrl_reg = ASPEED_PTCR_CTRL_EXT,
336 .type_part1 = ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART1,
337 .type_part2 = ASPEED_PTCR_CTRL_SET_PWMH_TYPE_PART2,
338 .type_mask = ASPEED_PTCR_CTRL_SET_PWMH_TYPE_MASK,
339 .duty_ctrl_rise_point = DUTY_CTRL_PWM2_RISE_POINT,
340 .duty_ctrl_fall_point = DUTY_CTRL_PWM2_FALL_POINT,
341 .duty_ctrl_reg = ASPEED_PTCR_DUTY3_CTRL,
342 .duty_ctrl_rise_fall_mask = DUTY_CTRL_PWM2_RISE_FALL_MASK,
343 }
344};
345
346static int regmap_aspeed_pwm_tacho_reg_write(void *context, unsigned int reg,
347 unsigned int val)
348{
349 void __iomem *regs = (void __iomem *)context;
350
351 writel(val, regs + reg);
352 return 0;
353}
354
355static int regmap_aspeed_pwm_tacho_reg_read(void *context, unsigned int reg,
356 unsigned int *val)
357{
358 void __iomem *regs = (void __iomem *)context;
359
360 *val = readl(regs + reg);
361 return 0;
362}
363
364static const struct regmap_config aspeed_pwm_tacho_regmap_config = {
365 .reg_bits = 32,
366 .val_bits = 32,
367 .reg_stride = 4,
368 .max_register = ASPEED_PTCR_TYPEO_LIMIT,
369 .reg_write = regmap_aspeed_pwm_tacho_reg_write,
370 .reg_read = regmap_aspeed_pwm_tacho_reg_read,
371 .fast_io = true,
372};
373
374static void aspeed_set_clock_enable(struct regmap *regmap, bool val)
375{
376 regmap_update_bits(regmap, ASPEED_PTCR_CTRL,
377 ASPEED_PTCR_CTRL_CLK_EN,
378 val ? ASPEED_PTCR_CTRL_CLK_EN : 0);
379}
380
381static void aspeed_set_clock_source(struct regmap *regmap, int val)
382{
383 regmap_update_bits(regmap, ASPEED_PTCR_CTRL,
384 ASPEED_PTCR_CTRL_CLK_SRC,
385 val ? ASPEED_PTCR_CTRL_CLK_SRC : 0);
386}
387
388static void aspeed_set_pwm_clock_values(struct regmap *regmap, u8 type,
389 u8 div_high, u8 div_low, u8 unit)
390{
391 u32 reg_value = ((div_high << type_params[type].h_value) |
392 (div_low << type_params[type].l_value) |
393 (unit << type_params[type].unit_value));
394
395 regmap_update_bits(regmap, type_params[type].clk_ctrl_reg,
396 type_params[type].clk_ctrl_mask, reg_value);
397}
398
399static void aspeed_set_pwm_port_enable(struct regmap *regmap, u8 pwm_port,
400 bool enable)
401{
402 regmap_update_bits(regmap, pwm_port_params[pwm_port].ctrl_reg,
403 pwm_port_params[pwm_port].pwm_en,
404 enable ? pwm_port_params[pwm_port].pwm_en : 0);
405}
406
407static void aspeed_set_pwm_port_type(struct regmap *regmap,
408 u8 pwm_port, u8 type)
409{
410 u32 reg_value = (type & 0x1) << pwm_port_params[pwm_port].type_part1;
411
412 reg_value |= (type & 0x2) << pwm_port_params[pwm_port].type_part2;
413
414 regmap_update_bits(regmap, pwm_port_params[pwm_port].ctrl_reg,
415 pwm_port_params[pwm_port].type_mask, reg_value);
416}
417
418static void aspeed_set_pwm_port_duty_rising_falling(struct regmap *regmap,
419 u8 pwm_port, u8 rising,
420 u8 falling)
421{
422 u32 reg_value = (rising <<
423 pwm_port_params[pwm_port].duty_ctrl_rise_point);
424 reg_value |= (falling <<
425 pwm_port_params[pwm_port].duty_ctrl_fall_point);
426
427 regmap_update_bits(regmap, pwm_port_params[pwm_port].duty_ctrl_reg,
428 pwm_port_params[pwm_port].duty_ctrl_rise_fall_mask,
429 reg_value);
430}
431
432static void aspeed_set_tacho_type_enable(struct regmap *regmap, u8 type,
433 bool enable)
434{
435 regmap_update_bits(regmap, type_params[type].ctrl_reg,
436 TYPE_CTRL_FAN_TYPE_EN,
437 enable ? TYPE_CTRL_FAN_TYPE_EN : 0);
438}
439
440static void aspeed_set_tacho_type_values(struct regmap *regmap, u8 type,
441 u8 mode, u16 unit, u8 division)
442{
443 u32 reg_value = ((mode << TYPE_CTRL_FAN_MODE) |
444 (unit << TYPE_CTRL_FAN_PERIOD) |
445 (division << TYPE_CTRL_FAN_DIVISION));
446
447 regmap_update_bits(regmap, type_params[type].ctrl_reg,
448 TYPE_CTRL_FAN_MASK, reg_value);
449 regmap_update_bits(regmap, type_params[type].ctrl_reg1,
450 TYPE_CTRL_FAN1_MASK, unit << 16);
451}
452
453static void aspeed_set_fan_tach_ch_enable(struct regmap *regmap, u8 fan_tach_ch,
454 bool enable)
455{
456 regmap_update_bits(regmap, ASPEED_PTCR_CTRL,
457 ASPEED_PTCR_CTRL_FAN_NUM_EN(fan_tach_ch),
458 enable ?
459 ASPEED_PTCR_CTRL_FAN_NUM_EN(fan_tach_ch) : 0);
460}
461
462static void aspeed_set_fan_tach_ch_source(struct regmap *regmap, u8 fan_tach_ch,
463 u8 fan_tach_ch_source)
464{
465 u32 reg_value1 = ((fan_tach_ch_source & 0x3) <<
466 TACH_PWM_SOURCE_BIT01(fan_tach_ch));
467 u32 reg_value2 = (((fan_tach_ch_source & 0x4) >> 2) <<
468 TACH_PWM_SOURCE_BIT2(fan_tach_ch));
469
470 regmap_update_bits(regmap, ASPEED_PTCR_TACH_SOURCE,
471 TACH_PWM_SOURCE_MASK_BIT01(fan_tach_ch),
472 reg_value1);
473
474 regmap_update_bits(regmap, ASPEED_PTCR_TACH_SOURCE_EXT,
475 TACH_PWM_SOURCE_MASK_BIT2(fan_tach_ch),
476 reg_value2);
477}
478
479static void aspeed_set_pwm_port_fan_ctrl(struct aspeed_pwm_tacho_data *priv,
480 u8 index, u8 fan_ctrl)
481{
482 u16 period, dc_time_on;
483
484 period = priv->type_pwm_clock_unit[priv->pwm_port_type[index]];
485 period += 1;
486 dc_time_on = (fan_ctrl * period) / PWM_MAX;
487
488 if (dc_time_on == 0) {
489 aspeed_set_pwm_port_enable(priv->regmap, index, false);
490 } else {
491 if (dc_time_on == period)
492 dc_time_on = 0;
493
494 aspeed_set_pwm_port_duty_rising_falling(priv->regmap, index, 0,
495 dc_time_on);
496 aspeed_set_pwm_port_enable(priv->regmap, index, true);
497 }
498}
499
500static u32 aspeed_get_fan_tach_ch_measure_period(struct aspeed_pwm_tacho_data
501 *priv, u8 type)
502{
503 u32 clk;
504 u16 tacho_unit;
505 u8 clk_unit, div_h, div_l, tacho_div;
506
507 clk = priv->clk_freq;
508 clk_unit = priv->type_pwm_clock_unit[type];
509 div_h = priv->type_pwm_clock_division_h[type];
510 div_h = 0x1 << div_h;
511 div_l = priv->type_pwm_clock_division_l[type];
512 if (div_l == 0)
513 div_l = 1;
514 else
515 div_l = div_l * 2;
516
517 tacho_unit = priv->type_fan_tach_unit[type];
518 tacho_div = priv->type_fan_tach_clock_division[type];
519
520 tacho_div = 0x4 << (tacho_div * 2);
521 return clk / (clk_unit * div_h * div_l * tacho_div * tacho_unit);
522}
523
7ed1c5e5 524static int aspeed_get_fan_tach_ch_rpm(struct aspeed_pwm_tacho_data *priv,
2d7a548a
JRN		 525 u8 fan_tach_ch)
526{
44b41366 527 u32 raw_data, tach_div, clk_source, msec, usec, val;
1e276292 528 u8 fan_tach_ch_source, type, mode, both;
44b41366 529 int ret;
2d7a548a
JRN		 530
531 regmap_write(priv->regmap, ASPEED_PTCR_TRIGGER, 0);
532 regmap_write(priv->regmap, ASPEED_PTCR_TRIGGER, 0x1 << fan_tach_ch);
533
534 fan_tach_ch_source = priv->fan_tach_ch_source[fan_tach_ch];
535 type = priv->pwm_port_type[fan_tach_ch_source];
536
44b41366
PV		 537 msec = (1000 / aspeed_get_fan_tach_ch_measure_period(priv, type));
538 usec = msec * 1000;
539
540 ret = regmap_read_poll_timeout(
541 priv->regmap,
542 ASPEED_PTCR_RESULT,
543 val,
544 (val & RESULT_STATUS_MASK),
545 ASPEED_RPM_STATUS_SLEEP_USEC,
546 usec);
2d7a548a 547
44b41366
PV		 548 /* return -ETIMEDOUT if we didn't get an answer. */
549 if (ret)
550 return ret;
7ed1c5e5 551
2d7a548a
JRN		 552 raw_data = val & RESULT_VALUE_MASK;
553 tach_div = priv->type_fan_tach_clock_division[type];
1e276292
PV		 554 /*
555 * We need the mode to determine if the raw_data is double (from
556 * counting both edges).
557 */
558 mode = priv->type_fan_tach_mode[type];
559 both = (mode & BOTH_EDGES) ? 1 : 0;
560
561 tach_div = (0x4 << both) << (tach_div * 2);
2d7a548a
JRN		 562 clk_source = priv->clk_freq;
563
564 if (raw_data == 0)
565 return 0;
566
567 return (clk_source * 60) / (2 * raw_data * tach_div);
568}
569
e98dd538
GR		 570static ssize_t pwm_store(struct device *dev, struct device_attribute *attr,
571 const char *buf, size_t count)
2d7a548a
JRN		 572{
573 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
574 int index = sensor_attr->index;
575 int ret;
576 struct aspeed_pwm_tacho_data *priv = dev_get_drvdata(dev);
577 long fan_ctrl;
578
579 ret = kstrtol(buf, 10, &fan_ctrl);
580 if (ret != 0)
581 return ret;
582
583 if (fan_ctrl < 0 || fan_ctrl > PWM_MAX)
584 return -EINVAL;
585
586 if (priv->pwm_port_fan_ctrl[index] == fan_ctrl)
587 return count;
588
589 priv->pwm_port_fan_ctrl[index] = fan_ctrl;
590 aspeed_set_pwm_port_fan_ctrl(priv, index, fan_ctrl);
591
592 return count;
593}
594
e98dd538 595static ssize_t pwm_show(struct device *dev, struct device_attribute *attr,
2d7a548a
JRN		 596 char *buf)
597{
598 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
599 int index = sensor_attr->index;
600 struct aspeed_pwm_tacho_data *priv = dev_get_drvdata(dev);
601
602 return sprintf(buf, "%u\n", priv->pwm_port_fan_ctrl[index]);
603}
604
e98dd538 605static ssize_t rpm_show(struct device *dev, struct device_attribute *attr,
2d7a548a
JRN		 606 char *buf)
607{
608 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
609 int index = sensor_attr->index;
7ed1c5e5 610 int rpm;
2d7a548a
JRN		 611 struct aspeed_pwm_tacho_data *priv = dev_get_drvdata(dev);
612
613 rpm = aspeed_get_fan_tach_ch_rpm(priv, index);
7ed1c5e5
PV		 614 if (rpm < 0)
615 return rpm;
2d7a548a 616
7ed1c5e5 617 return sprintf(buf, "%d\n", rpm);
2d7a548a
JRN		 618}
619
620static umode_t pwm_is_visible(struct kobject *kobj,
621 struct attribute *a, int index)
622{
623 struct device *dev = container_of(kobj, struct device, kobj);
624 struct aspeed_pwm_tacho_data *priv = dev_get_drvdata(dev);
625
626 if (!priv->pwm_present[index])
627 return 0;
628 return a->mode;
629}
630
631static umode_t fan_dev_is_visible(struct kobject *kobj,
632 struct attribute *a, int index)
633{
634 struct device *dev = container_of(kobj, struct device, kobj);
635 struct aspeed_pwm_tacho_data *priv = dev_get_drvdata(dev);
636
637 if (!priv->fan_tach_present[index])
638 return 0;
639 return a->mode;
640}
641
e98dd538
GR		 642static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
643static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
644static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, 2);
645static SENSOR_DEVICE_ATTR_RW(pwm4, pwm, 3);
646static SENSOR_DEVICE_ATTR_RW(pwm5, pwm, 4);
647static SENSOR_DEVICE_ATTR_RW(pwm6, pwm, 5);
648static SENSOR_DEVICE_ATTR_RW(pwm7, pwm, 6);
649static SENSOR_DEVICE_ATTR_RW(pwm8, pwm, 7);
2d7a548a 650static struct attribute *pwm_dev_attrs[] = {
2d7a548a
JRN		 651 &sensor_dev_attr_pwm1.dev_attr.attr,
652 &sensor_dev_attr_pwm2.dev_attr.attr,
653 &sensor_dev_attr_pwm3.dev_attr.attr,
654 &sensor_dev_attr_pwm4.dev_attr.attr,
655 &sensor_dev_attr_pwm5.dev_attr.attr,
656 &sensor_dev_attr_pwm6.dev_attr.attr,
657 &sensor_dev_attr_pwm7.dev_attr.attr,
5f348fa3 658 &sensor_dev_attr_pwm8.dev_attr.attr,
2d7a548a
JRN		 659 NULL,
660};
661
662static const struct attribute_group pwm_dev_group = {
663 .attrs = pwm_dev_attrs,
664 .is_visible = pwm_is_visible,
665};
666
e98dd538
GR		 667static SENSOR_DEVICE_ATTR_RO(fan1_input, rpm, 0);
668static SENSOR_DEVICE_ATTR_RO(fan2_input, rpm, 1);
669static SENSOR_DEVICE_ATTR_RO(fan3_input, rpm, 2);
670static SENSOR_DEVICE_ATTR_RO(fan4_input, rpm, 3);
671static SENSOR_DEVICE_ATTR_RO(fan5_input, rpm, 4);
672static SENSOR_DEVICE_ATTR_RO(fan6_input, rpm, 5);
673static SENSOR_DEVICE_ATTR_RO(fan7_input, rpm, 6);
674static SENSOR_DEVICE_ATTR_RO(fan8_input, rpm, 7);
675static SENSOR_DEVICE_ATTR_RO(fan9_input, rpm, 8);
676static SENSOR_DEVICE_ATTR_RO(fan10_input, rpm, 9);
677static SENSOR_DEVICE_ATTR_RO(fan11_input, rpm, 10);
678static SENSOR_DEVICE_ATTR_RO(fan12_input, rpm, 11);
679static SENSOR_DEVICE_ATTR_RO(fan13_input, rpm, 12);
680static SENSOR_DEVICE_ATTR_RO(fan14_input, rpm, 13);
681static SENSOR_DEVICE_ATTR_RO(fan15_input, rpm, 14);
682static SENSOR_DEVICE_ATTR_RO(fan16_input, rpm, 15);
2d7a548a 683static struct attribute *fan_dev_attrs[] = {
2d7a548a
JRN		 684 &sensor_dev_attr_fan1_input.dev_attr.attr,
685 &sensor_dev_attr_fan2_input.dev_attr.attr,
686 &sensor_dev_attr_fan3_input.dev_attr.attr,
687 &sensor_dev_attr_fan4_input.dev_attr.attr,
688 &sensor_dev_attr_fan5_input.dev_attr.attr,
689 &sensor_dev_attr_fan6_input.dev_attr.attr,
690 &sensor_dev_attr_fan7_input.dev_attr.attr,
691 &sensor_dev_attr_fan8_input.dev_attr.attr,
692 &sensor_dev_attr_fan9_input.dev_attr.attr,
693 &sensor_dev_attr_fan10_input.dev_attr.attr,
694 &sensor_dev_attr_fan11_input.dev_attr.attr,
695 &sensor_dev_attr_fan12_input.dev_attr.attr,
696 &sensor_dev_attr_fan13_input.dev_attr.attr,
697 &sensor_dev_attr_fan14_input.dev_attr.attr,
698 &sensor_dev_attr_fan15_input.dev_attr.attr,
5f348fa3 699 &sensor_dev_attr_fan16_input.dev_attr.attr,
2d7a548a
JRN		 700 NULL
701};
702
703static const struct attribute_group fan_dev_group = {
704 .attrs = fan_dev_attrs,
705 .is_visible = fan_dev_is_visible,
706};
707
708/*
709 * The clock type is type M :
710 * The PWM frequency = 24MHz / (type M clock division L bit *
711 * type M clock division H bit * (type M PWM period bit + 1))
712 */
713static void aspeed_create_type(struct aspeed_pwm_tacho_data *priv)
714{
715 priv->type_pwm_clock_division_h[TYPEM] = M_PWM_DIV_H;
716 priv->type_pwm_clock_division_l[TYPEM] = M_PWM_DIV_L;
717 priv->type_pwm_clock_unit[TYPEM] = M_PWM_PERIOD;
718 aspeed_set_pwm_clock_values(priv->regmap, TYPEM, M_PWM_DIV_H,
719 M_PWM_DIV_L, M_PWM_PERIOD);
720 aspeed_set_tacho_type_enable(priv->regmap, TYPEM, true);
721 priv->type_fan_tach_clock_division[TYPEM] = M_TACH_CLK_DIV;
722 priv->type_fan_tach_unit[TYPEM] = M_TACH_UNIT;
1e276292 723 priv->type_fan_tach_mode[TYPEM] = M_TACH_MODE;
2d7a548a
JRN		 724 aspeed_set_tacho_type_values(priv->regmap, TYPEM, M_TACH_MODE,
725 M_TACH_UNIT, M_TACH_CLK_DIV);
726}
727
728static void aspeed_create_pwm_port(struct aspeed_pwm_tacho_data *priv,
729 u8 pwm_port)
730{
731 aspeed_set_pwm_port_enable(priv->regmap, pwm_port, true);
732 priv->pwm_present[pwm_port] = true;
733
734 priv->pwm_port_type[pwm_port] = TYPEM;
735 aspeed_set_pwm_port_type(priv->regmap, pwm_port, TYPEM);
736
737 priv->pwm_port_fan_ctrl[pwm_port] = INIT_FAN_CTRL;
738 aspeed_set_pwm_port_fan_ctrl(priv, pwm_port, INIT_FAN_CTRL);
739}
740
741static void aspeed_create_fan_tach_channel(struct aspeed_pwm_tacho_data *priv,
742 u8 *fan_tach_ch,
743 int count,
744 u8 pwm_source)
745{
746 u8 val, index;
747
748 for (val = 0; val < count; val++) {
749 index = fan_tach_ch[val];
750 aspeed_set_fan_tach_ch_enable(priv->regmap, index, true);
751 priv->fan_tach_present[index] = true;
752 priv->fan_tach_ch_source[index] = pwm_source;
753 aspeed_set_fan_tach_ch_source(priv->regmap, index, pwm_source);
754 }
755}
756
f198907d
MK		 757static int
758aspeed_pwm_cz_get_max_state(struct thermal_cooling_device *tcdev,
759 unsigned long *state)
760{
761 struct aspeed_cooling_device *cdev = tcdev->devdata;
762
763 *state = cdev->max_state;
764
765 return 0;
766}
767
768static int
769aspeed_pwm_cz_get_cur_state(struct thermal_cooling_device *tcdev,
770 unsigned long *state)
771{
772 struct aspeed_cooling_device *cdev = tcdev->devdata;
773
774 *state = cdev->cur_state;
775
776 return 0;
777}
778
779static int
780aspeed_pwm_cz_set_cur_state(struct thermal_cooling_device *tcdev,
781 unsigned long state)
782{
783 struct aspeed_cooling_device *cdev = tcdev->devdata;
784
785 if (state > cdev->max_state)
786 return -EINVAL;
787
788 cdev->cur_state = state;
789 cdev->priv->pwm_port_fan_ctrl[cdev->pwm_port] =
790 cdev->cooling_levels[cdev->cur_state];
791 aspeed_set_pwm_port_fan_ctrl(cdev->priv, cdev->pwm_port,
792 cdev->cooling_levels[cdev->cur_state]);
793
794 return 0;
795}
796
797static const struct thermal_cooling_device_ops aspeed_pwm_cool_ops = {
798 .get_max_state = aspeed_pwm_cz_get_max_state,
799 .get_cur_state = aspeed_pwm_cz_get_cur_state,
800 .set_cur_state = aspeed_pwm_cz_set_cur_state,
801};
802
803static int aspeed_create_pwm_cooling(struct device *dev,
804 struct device_node *child,
805 struct aspeed_pwm_tacho_data *priv,
806 u32 pwm_port, u8 num_levels)
807{
808 int ret;
809 struct aspeed_cooling_device *cdev;
810
811 cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
812
813 if (!cdev)
814 return -ENOMEM;
815
816 cdev->cooling_levels = devm_kzalloc(dev, num_levels, GFP_KERNEL);
817 if (!cdev->cooling_levels)
818 return -ENOMEM;
819
820 cdev->max_state = num_levels - 1;
821 ret = of_property_read_u8_array(child, "cooling-levels",
822 cdev->cooling_levels,
823 num_levels);
824 if (ret) {
825 dev_err(dev, "Property 'cooling-levels' cannot be read.\n");
826 return ret;
827 }
0debe4d0 828 snprintf(cdev->name, MAX_CDEV_NAME_LEN, "%pOFn%d", child, pwm_port);
f198907d 829
389c0ad1
GR		 830 cdev->tcdev = devm_thermal_of_cooling_device_register(dev, child,
831 cdev->name, cdev, &aspeed_pwm_cool_ops);
f198907d
MK		 832 if (IS_ERR(cdev->tcdev))
833 return PTR_ERR(cdev->tcdev);
834
835 cdev->priv = priv;
836 cdev->pwm_port = pwm_port;
837
838 priv->cdev[pwm_port] = cdev;
839
840 return 0;
841}
842
2d7a548a
JRN		 843static int aspeed_create_fan(struct device *dev,
844 struct device_node *child,
845 struct aspeed_pwm_tacho_data *priv)
846{
847 u8 *fan_tach_ch;
848 u32 pwm_port;
849 int ret, count;
850
851 ret = of_property_read_u32(child, "reg", &pwm_port);
852 if (ret)
853 return ret;
854 aspeed_create_pwm_port(priv, (u8)pwm_port);
855
f198907d
MK		 856 ret = of_property_count_u8_elems(child, "cooling-levels");
857
858 if (ret > 0) {
859 ret = aspeed_create_pwm_cooling(dev, child, priv, pwm_port,
860 ret);
861 if (ret)
862 return ret;
863 }
864
2d7a548a
JRN		 865 count = of_property_count_u8_elems(child, "aspeed,fan-tach-ch");
866 if (count < 1)
867 return -EINVAL;
a86854d0 868 fan_tach_ch = devm_kcalloc(dev, count, sizeof(*fan_tach_ch),
2d7a548a
JRN		 869 GFP_KERNEL);
870 if (!fan_tach_ch)
871 return -ENOMEM;
872 ret = of_property_read_u8_array(child, "aspeed,fan-tach-ch",
873 fan_tach_ch, count);
874 if (ret)
875 return ret;
876 aspeed_create_fan_tach_channel(priv, fan_tach_ch, count, pwm_port);
877
878 return 0;
879}
880
18c514cc
J		 881static void aspeed_pwm_tacho_remove(void *data)
882{
883 struct aspeed_pwm_tacho_data *priv = data;
884
885 reset_control_assert(priv->rst);
886}
887
2d7a548a
JRN		 888static int aspeed_pwm_tacho_probe(struct platform_device *pdev)
889{
890 struct device *dev = &pdev->dev;
891 struct device_node *np, *child;
892 struct aspeed_pwm_tacho_data *priv;
893 void __iomem *regs;
894 struct resource *res;
895 struct device *hwmon;
896 struct clk *clk;
897 int ret;
898
899 np = dev->of_node;
900
901 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
902 if (!res)
903 return -ENOENT;
904 regs = devm_ioremap_resource(dev, res);
905 if (IS_ERR(regs))
906 return PTR_ERR(regs);
907 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
908 if (!priv)
909 return -ENOMEM;
910 priv->regmap = devm_regmap_init(dev, NULL, (__force void *)regs,
911 &aspeed_pwm_tacho_regmap_config);
912 if (IS_ERR(priv->regmap))
913 return PTR_ERR(priv->regmap);
18c514cc
J		 914
915 priv->rst = devm_reset_control_get_exclusive(dev, NULL);
916 if (IS_ERR(priv->rst)) {
917 dev_err(dev,
918 "missing or invalid reset controller device tree entry");
919 return PTR_ERR(priv->rst);
920 }
921 reset_control_deassert(priv->rst);
922
923 ret = devm_add_action_or_reset(dev, aspeed_pwm_tacho_remove, priv);
924 if (ret)
925 return ret;
926
2d7a548a
JRN		 927 regmap_write(priv->regmap, ASPEED_PTCR_TACH_SOURCE, 0);
928 regmap_write(priv->regmap, ASPEED_PTCR_TACH_SOURCE_EXT, 0);
929
930 clk = devm_clk_get(dev, NULL);
931 if (IS_ERR(clk))
932 return -ENODEV;
933 priv->clk_freq = clk_get_rate(clk);
934 aspeed_set_clock_enable(priv->regmap, true);
935 aspeed_set_clock_source(priv->regmap, 0);
936
937 aspeed_create_type(priv);
938
939 for_each_child_of_node(np, child) {
940 ret = aspeed_create_fan(dev, child, priv);
f198907d
MK		 941 if (ret) {
942 of_node_put(child);
2d7a548a 943 return ret;
f198907d 944 }
2d7a548a 945 }
2d7a548a
JRN		 946
947 priv->groups[0] = &pwm_dev_group;
948 priv->groups[1] = &fan_dev_group;
949 priv->groups[2] = NULL;
950 hwmon = devm_hwmon_device_register_with_groups(dev,
951 "aspeed_pwm_tacho",
952 priv, priv->groups);
953 return PTR_ERR_OR_ZERO(hwmon);
954}
955
956static const struct of_device_id of_pwm_tacho_match_table[] = {
957 { .compatible = "aspeed,ast2400-pwm-tacho", },
958 { .compatible = "aspeed,ast2500-pwm-tacho", },
959 {},
960};
961MODULE_DEVICE_TABLE(of, of_pwm_tacho_match_table);
962
963static struct platform_driver aspeed_pwm_tacho_driver = {
964 .probe = aspeed_pwm_tacho_probe,
965 .driver = {
966 .name = "aspeed_pwm_tacho",
967 .of_match_table = of_pwm_tacho_match_table,
968 },
969};
970
971module_platform_driver(aspeed_pwm_tacho_driver);
972
973MODULE_AUTHOR("Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>");
974MODULE_DESCRIPTION("ASPEED PWM and Fan Tacho device driver");
975MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)