Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 1 | /* |
| 2 | * R-Car Gen3 THS thermal sensor driver |
| 3 | * Based on rcar_thermal.c and work from Hien Dang and Khiem Nguyen. |
| 4 | * |
| 5 | * Copyright (C) 2016 Renesas Electronics Corporation. |
| 6 | * Copyright (C) 2016 Sang Engineering |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; version 2 of the License. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, but |
| 13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * General Public License for more details. |
| 16 | * |
| 17 | */ |
| 18 | #include <linux/delay.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/io.h> |
| 22 | #include <linux/module.h> |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 23 | #include <linux/of_device.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/pm_runtime.h> |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 26 | #include <linux/spinlock.h> |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 27 | #include <linux/thermal.h> |
| 28 | |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 29 | #include "thermal_core.h" |
| 30 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 31 | /* Register offsets */ |
| 32 | #define REG_GEN3_IRQSTR 0x04 |
| 33 | #define REG_GEN3_IRQMSK 0x08 |
| 34 | #define REG_GEN3_IRQCTL 0x0C |
| 35 | #define REG_GEN3_IRQEN 0x10 |
| 36 | #define REG_GEN3_IRQTEMP1 0x14 |
| 37 | #define REG_GEN3_IRQTEMP2 0x18 |
| 38 | #define REG_GEN3_IRQTEMP3 0x1C |
| 39 | #define REG_GEN3_CTSR 0x20 |
| 40 | #define REG_GEN3_THCTR 0x20 |
| 41 | #define REG_GEN3_TEMP 0x28 |
| 42 | #define REG_GEN3_THCODE1 0x50 |
| 43 | #define REG_GEN3_THCODE2 0x54 |
| 44 | #define REG_GEN3_THCODE3 0x58 |
| 45 | |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 46 | /* IRQ{STR,MSK,EN} bits */ |
| 47 | #define IRQ_TEMP1 BIT(0) |
| 48 | #define IRQ_TEMP2 BIT(1) |
| 49 | #define IRQ_TEMP3 BIT(2) |
| 50 | #define IRQ_TEMPD1 BIT(3) |
| 51 | #define IRQ_TEMPD2 BIT(4) |
| 52 | #define IRQ_TEMPD3 BIT(5) |
| 53 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 54 | /* CTSR bits */ |
| 55 | #define CTSR_PONM BIT(8) |
| 56 | #define CTSR_AOUT BIT(7) |
| 57 | #define CTSR_THBGR BIT(5) |
| 58 | #define CTSR_VMEN BIT(4) |
| 59 | #define CTSR_VMST BIT(1) |
| 60 | #define CTSR_THSST BIT(0) |
| 61 | |
| 62 | /* THCTR bits */ |
| 63 | #define THCTR_PONM BIT(6) |
| 64 | #define THCTR_THSST BIT(0) |
| 65 | |
| 66 | #define CTEMP_MASK 0xFFF |
| 67 | |
| 68 | #define MCELSIUS(temp) ((temp) * 1000) |
| 69 | #define GEN3_FUSE_MASK 0xFFF |
| 70 | |
| 71 | #define TSC_MAX_NUM 3 |
| 72 | |
| 73 | /* Structure for thermal temperature calculation */ |
| 74 | struct equation_coefs { |
| 75 | int a1; |
| 76 | int b1; |
| 77 | int a2; |
| 78 | int b2; |
| 79 | }; |
| 80 | |
| 81 | struct rcar_gen3_thermal_tsc { |
| 82 | void __iomem *base; |
| 83 | struct thermal_zone_device *zone; |
| 84 | struct equation_coefs coef; |
Niklas Söderlund | 75f78d6 | 2017-03-29 20:43:56 +0200 | [diff] [blame] | 85 | int low; |
| 86 | int high; |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 87 | }; |
| 88 | |
| 89 | struct rcar_gen3_thermal_priv { |
| 90 | struct rcar_gen3_thermal_tsc *tscs[TSC_MAX_NUM]; |
Niklas Söderlund | 97dad1f | 2017-03-29 20:43:53 +0200 | [diff] [blame] | 91 | unsigned int num_tscs; |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 92 | spinlock_t lock; /* Protect interrupts on and off */ |
Niklas Söderlund | cc4d072 | 2017-03-29 20:43:55 +0200 | [diff] [blame] | 93 | const struct rcar_gen3_thermal_data *data; |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 94 | }; |
| 95 | |
| 96 | struct rcar_gen3_thermal_data { |
| 97 | void (*thermal_init)(struct rcar_gen3_thermal_tsc *tsc); |
| 98 | }; |
| 99 | |
| 100 | static inline u32 rcar_gen3_thermal_read(struct rcar_gen3_thermal_tsc *tsc, |
| 101 | u32 reg) |
| 102 | { |
| 103 | return ioread32(tsc->base + reg); |
| 104 | } |
| 105 | |
| 106 | static inline void rcar_gen3_thermal_write(struct rcar_gen3_thermal_tsc *tsc, |
| 107 | u32 reg, u32 data) |
| 108 | { |
| 109 | iowrite32(data, tsc->base + reg); |
| 110 | } |
| 111 | |
| 112 | /* |
| 113 | * Linear approximation for temperature |
| 114 | * |
| 115 | * [reg] = [temp] * a + b => [temp] = ([reg] - b) / a |
| 116 | * |
| 117 | * The constants a and b are calculated using two triplets of int values PTAT |
| 118 | * and THCODE. PTAT and THCODE can either be read from hardware or use hard |
| 119 | * coded values from driver. The formula to calculate a and b are taken from |
| 120 | * BSP and sparsely documented and understood. |
| 121 | * |
| 122 | * Examining the linear formula and the formula used to calculate constants a |
| 123 | * and b while knowing that the span for PTAT and THCODE values are between |
| 124 | * 0x000 and 0xfff the largest integer possible is 0xfff * 0xfff == 0xffe001. |
| 125 | * Integer also needs to be signed so that leaves 7 bits for binary |
| 126 | * fixed point scaling. |
| 127 | */ |
| 128 | |
| 129 | #define FIXPT_SHIFT 7 |
| 130 | #define FIXPT_INT(_x) ((_x) << FIXPT_SHIFT) |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 131 | #define INT_FIXPT(_x) ((_x) >> FIXPT_SHIFT) |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 132 | #define FIXPT_DIV(_a, _b) DIV_ROUND_CLOSEST(((_a) << FIXPT_SHIFT), (_b)) |
| 133 | #define FIXPT_TO_MCELSIUS(_x) ((_x) * 1000 >> FIXPT_SHIFT) |
| 134 | |
| 135 | #define RCAR3_THERMAL_GRAN 500 /* mili Celsius */ |
| 136 | |
| 137 | /* no idea where these constants come from */ |
| 138 | #define TJ_1 96 |
| 139 | #define TJ_3 -41 |
| 140 | |
| 141 | static void rcar_gen3_thermal_calc_coefs(struct equation_coefs *coef, |
| 142 | int *ptat, int *thcode) |
| 143 | { |
| 144 | int tj_2; |
| 145 | |
| 146 | /* TODO: Find documentation and document constant calculation formula */ |
| 147 | |
| 148 | /* |
| 149 | * Division is not scaled in BSP and if scaled it might overflow |
| 150 | * the dividend (4095 * 4095 << 14 > INT_MAX) so keep it unscaled |
| 151 | */ |
| 152 | tj_2 = (FIXPT_INT((ptat[1] - ptat[2]) * 137) |
| 153 | / (ptat[0] - ptat[2])) - FIXPT_INT(41); |
| 154 | |
| 155 | coef->a1 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[2]), |
| 156 | tj_2 - FIXPT_INT(TJ_3)); |
| 157 | coef->b1 = FIXPT_INT(thcode[2]) - coef->a1 * TJ_3; |
| 158 | |
| 159 | coef->a2 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[0]), |
| 160 | tj_2 - FIXPT_INT(TJ_1)); |
| 161 | coef->b2 = FIXPT_INT(thcode[0]) - coef->a2 * TJ_1; |
| 162 | } |
| 163 | |
| 164 | static int rcar_gen3_thermal_round(int temp) |
| 165 | { |
| 166 | int result, round_offs; |
| 167 | |
| 168 | round_offs = temp >= 0 ? RCAR3_THERMAL_GRAN / 2 : |
| 169 | -RCAR3_THERMAL_GRAN / 2; |
| 170 | result = (temp + round_offs) / RCAR3_THERMAL_GRAN; |
| 171 | return result * RCAR3_THERMAL_GRAN; |
| 172 | } |
| 173 | |
| 174 | static int rcar_gen3_thermal_get_temp(void *devdata, int *temp) |
| 175 | { |
| 176 | struct rcar_gen3_thermal_tsc *tsc = devdata; |
| 177 | int mcelsius, val1, val2; |
| 178 | u32 reg; |
| 179 | |
| 180 | /* Read register and convert to mili Celsius */ |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 181 | reg = rcar_gen3_thermal_read(tsc, REG_GEN3_TEMP) & CTEMP_MASK; |
| 182 | |
| 183 | val1 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b1, tsc->coef.a1); |
| 184 | val2 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b2, tsc->coef.a2); |
| 185 | mcelsius = FIXPT_TO_MCELSIUS((val1 + val2) / 2); |
| 186 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 187 | /* Make sure we are inside specifications */ |
| 188 | if ((mcelsius < MCELSIUS(-40)) || (mcelsius > MCELSIUS(125))) |
| 189 | return -EIO; |
| 190 | |
| 191 | /* Round value to device granularity setting */ |
| 192 | *temp = rcar_gen3_thermal_round(mcelsius); |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 197 | static int rcar_gen3_thermal_mcelsius_to_temp(struct rcar_gen3_thermal_tsc *tsc, |
| 198 | int mcelsius) |
| 199 | { |
| 200 | int celsius, val1, val2; |
| 201 | |
| 202 | celsius = DIV_ROUND_CLOSEST(mcelsius, 1000); |
| 203 | val1 = celsius * tsc->coef.a1 + tsc->coef.b1; |
| 204 | val2 = celsius * tsc->coef.a2 + tsc->coef.b2; |
| 205 | |
| 206 | return INT_FIXPT((val1 + val2) / 2); |
| 207 | } |
| 208 | |
| 209 | static int rcar_gen3_thermal_set_trips(void *devdata, int low, int high) |
| 210 | { |
| 211 | struct rcar_gen3_thermal_tsc *tsc = devdata; |
| 212 | |
| 213 | low = clamp_val(low, -40000, 125000); |
| 214 | high = clamp_val(high, -40000, 125000); |
| 215 | |
| 216 | rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP1, |
| 217 | rcar_gen3_thermal_mcelsius_to_temp(tsc, low)); |
| 218 | |
| 219 | rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP2, |
| 220 | rcar_gen3_thermal_mcelsius_to_temp(tsc, high)); |
| 221 | |
Niklas Söderlund | 75f78d6 | 2017-03-29 20:43:56 +0200 | [diff] [blame] | 222 | tsc->low = low; |
| 223 | tsc->high = high; |
| 224 | |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 225 | return 0; |
| 226 | } |
| 227 | |
Julia Lawall | a0def10 | 2017-08-08 17:08:57 +0200 | [diff] [blame] | 228 | static const struct thermal_zone_of_device_ops rcar_gen3_tz_of_ops = { |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 229 | .get_temp = rcar_gen3_thermal_get_temp, |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 230 | .set_trips = rcar_gen3_thermal_set_trips, |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 231 | }; |
| 232 | |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 233 | static void rcar_thermal_irq_set(struct rcar_gen3_thermal_priv *priv, bool on) |
| 234 | { |
| 235 | unsigned int i; |
| 236 | u32 val = on ? IRQ_TEMPD1 | IRQ_TEMP2 : 0; |
| 237 | |
| 238 | for (i = 0; i < priv->num_tscs; i++) |
| 239 | rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQMSK, val); |
| 240 | } |
| 241 | |
| 242 | static irqreturn_t rcar_gen3_thermal_irq(int irq, void *data) |
| 243 | { |
| 244 | struct rcar_gen3_thermal_priv *priv = data; |
| 245 | u32 status; |
| 246 | int i, ret = IRQ_HANDLED; |
| 247 | |
| 248 | spin_lock(&priv->lock); |
| 249 | for (i = 0; i < priv->num_tscs; i++) { |
| 250 | status = rcar_gen3_thermal_read(priv->tscs[i], REG_GEN3_IRQSTR); |
| 251 | rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQSTR, 0); |
| 252 | if (status) |
| 253 | ret = IRQ_WAKE_THREAD; |
| 254 | } |
| 255 | |
| 256 | if (ret == IRQ_WAKE_THREAD) |
| 257 | rcar_thermal_irq_set(priv, false); |
| 258 | |
| 259 | spin_unlock(&priv->lock); |
| 260 | |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | static irqreturn_t rcar_gen3_thermal_irq_thread(int irq, void *data) |
| 265 | { |
| 266 | struct rcar_gen3_thermal_priv *priv = data; |
| 267 | unsigned long flags; |
| 268 | int i; |
| 269 | |
| 270 | for (i = 0; i < priv->num_tscs; i++) |
| 271 | thermal_zone_device_update(priv->tscs[i]->zone, |
| 272 | THERMAL_EVENT_UNSPECIFIED); |
| 273 | |
| 274 | spin_lock_irqsave(&priv->lock, flags); |
| 275 | rcar_thermal_irq_set(priv, true); |
| 276 | spin_unlock_irqrestore(&priv->lock, flags); |
| 277 | |
| 278 | return IRQ_HANDLED; |
| 279 | } |
| 280 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 281 | static void r8a7795_thermal_init(struct rcar_gen3_thermal_tsc *tsc) |
| 282 | { |
| 283 | rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_THBGR); |
| 284 | rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, 0x0); |
| 285 | |
| 286 | usleep_range(1000, 2000); |
| 287 | |
| 288 | rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_PONM); |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 289 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 290 | rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F); |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 291 | rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0); |
| 292 | rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN, IRQ_TEMPD1 | IRQ_TEMP2); |
| 293 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 294 | rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, |
| 295 | CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN); |
| 296 | |
| 297 | usleep_range(100, 200); |
| 298 | |
| 299 | rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, |
| 300 | CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN | |
| 301 | CTSR_VMST | CTSR_THSST); |
| 302 | |
| 303 | usleep_range(1000, 2000); |
| 304 | } |
| 305 | |
| 306 | static void r8a7796_thermal_init(struct rcar_gen3_thermal_tsc *tsc) |
| 307 | { |
| 308 | u32 reg_val; |
| 309 | |
| 310 | reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR); |
| 311 | reg_val &= ~THCTR_PONM; |
| 312 | rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val); |
| 313 | |
| 314 | usleep_range(1000, 2000); |
| 315 | |
| 316 | rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F); |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 317 | rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0); |
| 318 | rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN, IRQ_TEMPD1 | IRQ_TEMP2); |
| 319 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 320 | reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR); |
| 321 | reg_val |= THCTR_THSST; |
| 322 | rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val); |
Niklas Söderlund | 78aefd2 | 2017-03-29 20:43:50 +0200 | [diff] [blame] | 323 | |
| 324 | usleep_range(1000, 2000); |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | static const struct rcar_gen3_thermal_data r8a7795_data = { |
| 328 | .thermal_init = r8a7795_thermal_init, |
| 329 | }; |
| 330 | |
| 331 | static const struct rcar_gen3_thermal_data r8a7796_data = { |
| 332 | .thermal_init = r8a7796_thermal_init, |
| 333 | }; |
| 334 | |
| 335 | static const struct of_device_id rcar_gen3_thermal_dt_ids[] = { |
| 336 | { .compatible = "renesas,r8a7795-thermal", .data = &r8a7795_data}, |
| 337 | { .compatible = "renesas,r8a7796-thermal", .data = &r8a7796_data}, |
| 338 | {}, |
| 339 | }; |
| 340 | MODULE_DEVICE_TABLE(of, rcar_gen3_thermal_dt_ids); |
| 341 | |
| 342 | static int rcar_gen3_thermal_remove(struct platform_device *pdev) |
| 343 | { |
| 344 | struct device *dev = &pdev->dev; |
| 345 | |
| 346 | pm_runtime_put(dev); |
| 347 | pm_runtime_disable(dev); |
| 348 | |
| 349 | return 0; |
| 350 | } |
| 351 | |
| 352 | static int rcar_gen3_thermal_probe(struct platform_device *pdev) |
| 353 | { |
| 354 | struct rcar_gen3_thermal_priv *priv; |
| 355 | struct device *dev = &pdev->dev; |
| 356 | struct resource *res; |
| 357 | struct thermal_zone_device *zone; |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 358 | int ret, irq, i; |
| 359 | char *irqname; |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 360 | |
| 361 | /* default values if FUSEs are missing */ |
| 362 | /* TODO: Read values from hardware on supported platforms */ |
| 363 | int ptat[3] = { 2351, 1509, 435 }; |
| 364 | int thcode[TSC_MAX_NUM][3] = { |
| 365 | { 3248, 2800, 2221 }, |
| 366 | { 3245, 2795, 2216 }, |
| 367 | { 3250, 2805, 2237 }, |
| 368 | }; |
| 369 | |
| 370 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
| 371 | if (!priv) |
| 372 | return -ENOMEM; |
| 373 | |
Niklas Söderlund | cc4d072 | 2017-03-29 20:43:55 +0200 | [diff] [blame] | 374 | priv->data = of_device_get_match_data(dev); |
| 375 | |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 376 | spin_lock_init(&priv->lock); |
| 377 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 378 | platform_set_drvdata(pdev, priv); |
| 379 | |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 380 | /* |
| 381 | * Request 2 (of the 3 possible) IRQs, the driver only needs to |
| 382 | * to trigger on the low and high trip points of the current |
| 383 | * temp window at this point. |
| 384 | */ |
| 385 | for (i = 0; i < 2; i++) { |
| 386 | irq = platform_get_irq(pdev, i); |
| 387 | if (irq < 0) |
| 388 | return irq; |
| 389 | |
| 390 | irqname = devm_kasprintf(dev, GFP_KERNEL, "%s:ch%d", |
| 391 | dev_name(dev), i); |
| 392 | if (!irqname) |
| 393 | return -ENOMEM; |
| 394 | |
| 395 | ret = devm_request_threaded_irq(dev, irq, rcar_gen3_thermal_irq, |
| 396 | rcar_gen3_thermal_irq_thread, |
| 397 | IRQF_SHARED, irqname, priv); |
| 398 | if (ret) |
| 399 | return ret; |
| 400 | } |
| 401 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 402 | pm_runtime_enable(dev); |
| 403 | pm_runtime_get_sync(dev); |
| 404 | |
| 405 | for (i = 0; i < TSC_MAX_NUM; i++) { |
| 406 | struct rcar_gen3_thermal_tsc *tsc; |
| 407 | |
Niklas Söderlund | d51546c | 2017-03-29 20:43:52 +0200 | [diff] [blame] | 408 | res = platform_get_resource(pdev, IORESOURCE_MEM, i); |
| 409 | if (!res) |
| 410 | break; |
| 411 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 412 | tsc = devm_kzalloc(dev, sizeof(*tsc), GFP_KERNEL); |
| 413 | if (!tsc) { |
| 414 | ret = -ENOMEM; |
| 415 | goto error_unregister; |
| 416 | } |
| 417 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 418 | tsc->base = devm_ioremap_resource(dev, res); |
| 419 | if (IS_ERR(tsc->base)) { |
| 420 | ret = PTR_ERR(tsc->base); |
| 421 | goto error_unregister; |
| 422 | } |
| 423 | |
| 424 | priv->tscs[i] = tsc; |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 425 | |
Niklas Söderlund | cc4d072 | 2017-03-29 20:43:55 +0200 | [diff] [blame] | 426 | priv->data->thermal_init(tsc); |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 427 | rcar_gen3_thermal_calc_coefs(&tsc->coef, ptat, thcode[i]); |
| 428 | |
| 429 | zone = devm_thermal_zone_of_sensor_register(dev, i, tsc, |
| 430 | &rcar_gen3_tz_of_ops); |
| 431 | if (IS_ERR(zone)) { |
| 432 | dev_err(dev, "Can't register thermal zone\n"); |
| 433 | ret = PTR_ERR(zone); |
| 434 | goto error_unregister; |
| 435 | } |
| 436 | tsc->zone = zone; |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 437 | |
| 438 | ret = of_thermal_get_ntrips(tsc->zone); |
| 439 | if (ret < 0) |
| 440 | goto error_unregister; |
| 441 | |
| 442 | dev_info(dev, "TSC%d: Loaded %d trip points\n", i, ret); |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 443 | } |
| 444 | |
Niklas Söderlund | 97dad1f | 2017-03-29 20:43:53 +0200 | [diff] [blame] | 445 | priv->num_tscs = i; |
| 446 | |
| 447 | if (!priv->num_tscs) { |
| 448 | ret = -ENODEV; |
| 449 | goto error_unregister; |
| 450 | } |
| 451 | |
Niklas Söderlund | 7d4b269 | 2017-03-29 20:43:54 +0200 | [diff] [blame] | 452 | rcar_thermal_irq_set(priv, true); |
| 453 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 454 | return 0; |
| 455 | |
| 456 | error_unregister: |
| 457 | rcar_gen3_thermal_remove(pdev); |
| 458 | |
| 459 | return ret; |
| 460 | } |
| 461 | |
Niklas Söderlund | 75f78d6 | 2017-03-29 20:43:56 +0200 | [diff] [blame] | 462 | static int __maybe_unused rcar_gen3_thermal_suspend(struct device *dev) |
| 463 | { |
| 464 | struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev); |
| 465 | |
| 466 | rcar_thermal_irq_set(priv, false); |
| 467 | |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | static int __maybe_unused rcar_gen3_thermal_resume(struct device *dev) |
| 472 | { |
| 473 | struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev); |
| 474 | unsigned int i; |
| 475 | |
| 476 | for (i = 0; i < priv->num_tscs; i++) { |
| 477 | struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i]; |
| 478 | |
| 479 | priv->data->thermal_init(tsc); |
| 480 | rcar_gen3_thermal_set_trips(tsc, tsc->low, tsc->high); |
| 481 | } |
| 482 | |
| 483 | rcar_thermal_irq_set(priv, true); |
| 484 | |
| 485 | return 0; |
| 486 | } |
| 487 | |
| 488 | static SIMPLE_DEV_PM_OPS(rcar_gen3_thermal_pm_ops, rcar_gen3_thermal_suspend, |
| 489 | rcar_gen3_thermal_resume); |
| 490 | |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 491 | static struct platform_driver rcar_gen3_thermal_driver = { |
| 492 | .driver = { |
| 493 | .name = "rcar_gen3_thermal", |
Niklas Söderlund | 75f78d6 | 2017-03-29 20:43:56 +0200 | [diff] [blame] | 494 | .pm = &rcar_gen3_thermal_pm_ops, |
Wolfram Sang | 564e73d | 2016-12-22 11:38:21 +0100 | [diff] [blame] | 495 | .of_match_table = rcar_gen3_thermal_dt_ids, |
| 496 | }, |
| 497 | .probe = rcar_gen3_thermal_probe, |
| 498 | .remove = rcar_gen3_thermal_remove, |
| 499 | }; |
| 500 | module_platform_driver(rcar_gen3_thermal_driver); |
| 501 | |
| 502 | MODULE_LICENSE("GPL v2"); |
| 503 | MODULE_DESCRIPTION("R-Car Gen3 THS thermal sensor driver"); |
| 504 | MODULE_AUTHOR("Wolfram Sang <wsa+renesas@sang-engineering.com>"); |