1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2013 STMicroelectronics (R&D) Limited. 4 * Authors: 5 * Srinivas Kandagatla <srinivas.kandagatla@st.com> 6 */ 7 8 #include <linux/err.h> 9 #include <linux/gpio/driver.h> 10 #include <linux/init.h> 11 #include <linux/io.h> 12 #include <linux/mfd/syscon.h> 13 #include <linux/module.h> 14 #include <linux/of.h> 15 #include <linux/of_address.h> 16 #include <linux/of_irq.h> 17 #include <linux/platform_device.h> 18 #include <linux/regmap.h> 19 #include <linux/seq_file.h> 20 #include <linux/slab.h> 21 #include <linux/string_helpers.h> 22 23 #include <linux/pinctrl/consumer.h> 24 #include <linux/pinctrl/pinconf.h> 25 #include <linux/pinctrl/pinctrl.h> 26 #include <linux/pinctrl/pinmux.h> 27 28 #include "core.h" 29 30 /* PIO Block registers */ 31 /* PIO output */ 32 #define REG_PIO_POUT 0x00 33 /* Set bits of POUT */ 34 #define REG_PIO_SET_POUT 0x04 35 /* Clear bits of POUT */ 36 #define REG_PIO_CLR_POUT 0x08 37 /* PIO input */ 38 #define REG_PIO_PIN 0x10 39 /* PIO configuration */ 40 #define REG_PIO_PC(n) (0x20 + (n) * 0x10) 41 /* Set bits of PC[2:0] */ 42 #define REG_PIO_SET_PC(n) (0x24 + (n) * 0x10) 43 /* Clear bits of PC[2:0] */ 44 #define REG_PIO_CLR_PC(n) (0x28 + (n) * 0x10) 45 /* PIO input comparison */ 46 #define REG_PIO_PCOMP 0x50 47 /* Set bits of PCOMP */ 48 #define REG_PIO_SET_PCOMP 0x54 49 /* Clear bits of PCOMP */ 50 #define REG_PIO_CLR_PCOMP 0x58 51 /* PIO input comparison mask */ 52 #define REG_PIO_PMASK 0x60 53 /* Set bits of PMASK */ 54 #define REG_PIO_SET_PMASK 0x64 55 /* Clear bits of PMASK */ 56 #define REG_PIO_CLR_PMASK 0x68 57 58 #define ST_GPIO_DIRECTION_BIDIR 0x1 59 #define ST_GPIO_DIRECTION_OUT 0x2 60 #define ST_GPIO_DIRECTION_IN 0x4 61 62 /* 63 * Packed style retime configuration. 64 * There are two registers cfg0 and cfg1 in this style for each bank. 65 * Each field in this register is 8 bit corresponding to 8 pins in the bank. 66 */ 67 #define RT_P_CFGS_PER_BANK 2 68 #define RT_P_CFG0_CLK1NOTCLK0_FIELD(reg) REG_FIELD(reg, 0, 7) 69 #define RT_P_CFG0_DELAY_0_FIELD(reg) REG_FIELD(reg, 16, 23) 70 #define RT_P_CFG0_DELAY_1_FIELD(reg) REG_FIELD(reg, 24, 31) 71 #define RT_P_CFG1_INVERTCLK_FIELD(reg) REG_FIELD(reg, 0, 7) 72 #define RT_P_CFG1_RETIME_FIELD(reg) REG_FIELD(reg, 8, 15) 73 #define RT_P_CFG1_CLKNOTDATA_FIELD(reg) REG_FIELD(reg, 16, 23) 74 #define RT_P_CFG1_DOUBLE_EDGE_FIELD(reg) REG_FIELD(reg, 24, 31) 75 76 /* 77 * Dedicated style retime Configuration register 78 * each register is dedicated per pin. 79 */ 80 #define RT_D_CFGS_PER_BANK 8 81 #define RT_D_CFG_CLK_SHIFT 0 82 #define RT_D_CFG_CLK_MASK (0x3 << 0) 83 #define RT_D_CFG_CLKNOTDATA_SHIFT 2 84 #define RT_D_CFG_CLKNOTDATA_MASK BIT(2) 85 #define RT_D_CFG_DELAY_SHIFT 3 86 #define RT_D_CFG_DELAY_MASK (0xf << 3) 87 #define RT_D_CFG_DELAY_INNOTOUT_SHIFT 7 88 #define RT_D_CFG_DELAY_INNOTOUT_MASK BIT(7) 89 #define RT_D_CFG_DOUBLE_EDGE_SHIFT 8 90 #define RT_D_CFG_DOUBLE_EDGE_MASK BIT(8) 91 #define RT_D_CFG_INVERTCLK_SHIFT 9 92 #define RT_D_CFG_INVERTCLK_MASK BIT(9) 93 #define RT_D_CFG_RETIME_SHIFT 10 94 #define RT_D_CFG_RETIME_MASK BIT(10) 95 96 /* 97 * Pinconf is represented in an opaque unsigned long variable. 98 * Below is the bit allocation details for each possible configuration. 99 * All the bit fields can be encapsulated into four variables 100 * (direction, retime-type, retime-clk, retime-delay) 101 * 102 * +----------------+ 103 *[31:28]| reserved-3 | 104 * +----------------+------------- 105 *[27] | oe | | 106 * +----------------+ v 107 *[26] | pu | [Direction ] 108 * +----------------+ ^ 109 *[25] | od | | 110 * +----------------+------------- 111 *[24] | reserved-2 | 112 * +----------------+------------- 113 *[23] | retime | | 114 * +----------------+ | 115 *[22] | retime-invclk | | 116 * +----------------+ v 117 *[21] |retime-clknotdat| [Retime-type ] 118 * +----------------+ ^ 119 *[20] | retime-de | | 120 * +----------------+------------- 121 *[19:18]| retime-clk |------>[Retime-Clk ] 122 * +----------------+ 123 *[17:16]| reserved-1 | 124 * +----------------+ 125 *[15..0]| retime-delay |------>[Retime Delay] 126 * +----------------+ 127 */ 128 129 #define ST_PINCONF_UNPACK(conf, param)\ 130 ((conf >> ST_PINCONF_ ##param ##_SHIFT) \ 131 & ST_PINCONF_ ##param ##_MASK) 132 133 #define ST_PINCONF_PACK(conf, val, param) (conf |=\ 134 ((val & ST_PINCONF_ ##param ##_MASK) << \ 135 ST_PINCONF_ ##param ##_SHIFT)) 136 137 /* Output enable */ 138 #define ST_PINCONF_OE_MASK 0x1 139 #define ST_PINCONF_OE_SHIFT 27 140 #define ST_PINCONF_OE BIT(27) 141 #define ST_PINCONF_UNPACK_OE(conf) ST_PINCONF_UNPACK(conf, OE) 142 #define ST_PINCONF_PACK_OE(conf) ST_PINCONF_PACK(conf, 1, OE) 143 144 /* Pull Up */ 145 #define ST_PINCONF_PU_MASK 0x1 146 #define ST_PINCONF_PU_SHIFT 26 147 #define ST_PINCONF_PU BIT(26) 148 #define ST_PINCONF_UNPACK_PU(conf) ST_PINCONF_UNPACK(conf, PU) 149 #define ST_PINCONF_PACK_PU(conf) ST_PINCONF_PACK(conf, 1, PU) 150 151 /* Open Drain */ 152 #define ST_PINCONF_OD_MASK 0x1 153 #define ST_PINCONF_OD_SHIFT 25 154 #define ST_PINCONF_OD BIT(25) 155 #define ST_PINCONF_UNPACK_OD(conf) ST_PINCONF_UNPACK(conf, OD) 156 #define ST_PINCONF_PACK_OD(conf) ST_PINCONF_PACK(conf, 1, OD) 157 158 #define ST_PINCONF_RT_MASK 0x1 159 #define ST_PINCONF_RT_SHIFT 23 160 #define ST_PINCONF_RT BIT(23) 161 #define ST_PINCONF_UNPACK_RT(conf) ST_PINCONF_UNPACK(conf, RT) 162 #define ST_PINCONF_PACK_RT(conf) ST_PINCONF_PACK(conf, 1, RT) 163 164 #define ST_PINCONF_RT_INVERTCLK_MASK 0x1 165 #define ST_PINCONF_RT_INVERTCLK_SHIFT 22 166 #define ST_PINCONF_RT_INVERTCLK BIT(22) 167 #define ST_PINCONF_UNPACK_RT_INVERTCLK(conf) \ 168 ST_PINCONF_UNPACK(conf, RT_INVERTCLK) 169 #define ST_PINCONF_PACK_RT_INVERTCLK(conf) \ 170 ST_PINCONF_PACK(conf, 1, RT_INVERTCLK) 171 172 #define ST_PINCONF_RT_CLKNOTDATA_MASK 0x1 173 #define ST_PINCONF_RT_CLKNOTDATA_SHIFT 21 174 #define ST_PINCONF_RT_CLKNOTDATA BIT(21) 175 #define ST_PINCONF_UNPACK_RT_CLKNOTDATA(conf) \ 176 ST_PINCONF_UNPACK(conf, RT_CLKNOTDATA) 177 #define ST_PINCONF_PACK_RT_CLKNOTDATA(conf) \ 178 ST_PINCONF_PACK(conf, 1, RT_CLKNOTDATA) 179 180 #define ST_PINCONF_RT_DOUBLE_EDGE_MASK 0x1 181 #define ST_PINCONF_RT_DOUBLE_EDGE_SHIFT 20 182 #define ST_PINCONF_RT_DOUBLE_EDGE BIT(20) 183 #define ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(conf) \ 184 ST_PINCONF_UNPACK(conf, RT_DOUBLE_EDGE) 185 #define ST_PINCONF_PACK_RT_DOUBLE_EDGE(conf) \ 186 ST_PINCONF_PACK(conf, 1, RT_DOUBLE_EDGE) 187 188 #define ST_PINCONF_RT_CLK_MASK 0x3 189 #define ST_PINCONF_RT_CLK_SHIFT 18 190 #define ST_PINCONF_RT_CLK BIT(18) 191 #define ST_PINCONF_UNPACK_RT_CLK(conf) ST_PINCONF_UNPACK(conf, RT_CLK) 192 #define ST_PINCONF_PACK_RT_CLK(conf, val) ST_PINCONF_PACK(conf, val, RT_CLK) 193 194 /* RETIME_DELAY in Pico Secs */ 195 #define ST_PINCONF_RT_DELAY_MASK 0xffff 196 #define ST_PINCONF_RT_DELAY_SHIFT 0 197 #define ST_PINCONF_UNPACK_RT_DELAY(conf) ST_PINCONF_UNPACK(conf, RT_DELAY) 198 #define ST_PINCONF_PACK_RT_DELAY(conf, val) \ 199 ST_PINCONF_PACK(conf, val, RT_DELAY) 200 201 #define ST_GPIO_PINS_PER_BANK (8) 202 #define OF_GPIO_ARGS_MIN (4) 203 #define OF_RT_ARGS_MIN (2) 204 205 #define gpio_range_to_bank(chip) \ 206 container_of(chip, struct st_gpio_bank, range) 207 208 #define pc_to_bank(pc) \ 209 container_of(pc, struct st_gpio_bank, pc) 210 211 enum st_retime_style { 212 st_retime_style_none, 213 st_retime_style_packed, 214 st_retime_style_dedicated, 215 }; 216 217 struct st_retime_dedicated { 218 struct regmap_field *rt[ST_GPIO_PINS_PER_BANK]; 219 }; 220 221 struct st_retime_packed { 222 struct regmap_field *clk1notclk0; 223 struct regmap_field *delay_0; 224 struct regmap_field *delay_1; 225 struct regmap_field *invertclk; 226 struct regmap_field *retime; 227 struct regmap_field *clknotdata; 228 struct regmap_field *double_edge; 229 }; 230 231 struct st_pio_control { 232 u32 rt_pin_mask; 233 struct regmap_field *alt, *oe, *pu, *od; 234 /* retiming */ 235 union { 236 struct st_retime_packed rt_p; 237 struct st_retime_dedicated rt_d; 238 } rt; 239 }; 240 241 struct st_pctl_data { 242 const enum st_retime_style rt_style; 243 const unsigned int *input_delays; 244 const int ninput_delays; 245 const unsigned int *output_delays; 246 const int noutput_delays; 247 /* register offset information */ 248 const int alt, oe, pu, od, rt; 249 }; 250 251 struct st_pinconf { 252 int pin; 253 const char *name; 254 unsigned long config; 255 int altfunc; 256 }; 257 258 struct st_pmx_func { 259 const char *name; 260 const char **groups; 261 unsigned ngroups; 262 }; 263 264 struct st_pctl_group { 265 const char *name; 266 unsigned int *pins; 267 unsigned npins; 268 struct st_pinconf *pin_conf; 269 }; 270 271 /* 272 * Edge triggers are not supported at hardware level, it is supported by 273 * software by exploiting the level trigger support in hardware. 274 * Software uses a virtual register (EDGE_CONF) for edge trigger configuration 275 * of each gpio pin in a GPIO bank. 276 * 277 * Each bank has a 32 bit EDGE_CONF register which is divided in to 8 parts of 278 * 4-bits. Each 4-bit space is allocated for each pin in a gpio bank. 279 * 280 * bit allocation per pin is: 281 * Bits: [0 - 3] | [4 - 7] [8 - 11] ... ... ... ... [ 28 - 31] 282 * -------------------------------------------------------- 283 * | pin-0 | pin-2 | pin-3 | ... ... ... ... | pin -7 | 284 * -------------------------------------------------------- 285 * 286 * A pin can have one of following the values in its edge configuration field. 287 * 288 * ------- ---------------------------- 289 * [0-3] - Description 290 * ------- ---------------------------- 291 * 0000 - No edge IRQ. 292 * 0001 - Falling edge IRQ. 293 * 0010 - Rising edge IRQ. 294 * 0011 - Rising and Falling edge IRQ. 295 * ------- ---------------------------- 296 */ 297 298 #define ST_IRQ_EDGE_CONF_BITS_PER_PIN 4 299 #define ST_IRQ_EDGE_MASK 0xf 300 #define ST_IRQ_EDGE_FALLING BIT(0) 301 #define ST_IRQ_EDGE_RISING BIT(1) 302 #define ST_IRQ_EDGE_BOTH (BIT(0) | BIT(1)) 303 304 #define ST_IRQ_RISING_EDGE_CONF(pin) \ 305 (ST_IRQ_EDGE_RISING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN)) 306 307 #define ST_IRQ_FALLING_EDGE_CONF(pin) \ 308 (ST_IRQ_EDGE_FALLING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN)) 309 310 #define ST_IRQ_BOTH_EDGE_CONF(pin) \ 311 (ST_IRQ_EDGE_BOTH << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN)) 312 313 #define ST_IRQ_EDGE_CONF(conf, pin) \ 314 (conf >> (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN) & ST_IRQ_EDGE_MASK) 315 316 struct st_gpio_bank { 317 struct gpio_chip gpio_chip; 318 struct pinctrl_gpio_range range; 319 void __iomem *base; 320 struct st_pio_control pc; 321 unsigned long irq_edge_conf; 322 spinlock_t lock; 323 }; 324 325 struct st_pinctrl { 326 struct device *dev; 327 struct pinctrl_dev *pctl; 328 struct st_gpio_bank *banks; 329 int nbanks; 330 struct st_pmx_func *functions; 331 int nfunctions; 332 struct st_pctl_group *groups; 333 int ngroups; 334 struct regmap *regmap; 335 const struct st_pctl_data *data; 336 void __iomem *irqmux_base; 337 }; 338 339 /* SOC specific data */ 340 341 static const unsigned int stih407_delays[] = {0, 300, 500, 750, 1000, 1250, 342 1500, 1750, 2000, 2250, 2500, 2750, 3000, 3250 }; 343 344 static const struct st_pctl_data stih407_data = { 345 .rt_style = st_retime_style_dedicated, 346 .input_delays = stih407_delays, 347 .ninput_delays = ARRAY_SIZE(stih407_delays), 348 .output_delays = stih407_delays, 349 .noutput_delays = ARRAY_SIZE(stih407_delays), 350 .alt = 0, .oe = 40, .pu = 50, .od = 60, .rt = 100, 351 }; 352 353 static const struct st_pctl_data stih407_flashdata = { 354 .rt_style = st_retime_style_none, 355 .input_delays = stih407_delays, 356 .ninput_delays = ARRAY_SIZE(stih407_delays), 357 .output_delays = stih407_delays, 358 .noutput_delays = ARRAY_SIZE(stih407_delays), 359 .alt = 0, 360 .oe = -1, /* Not Available */ 361 .pu = -1, /* Not Available */ 362 .od = 60, 363 .rt = 100, 364 }; 365 366 static struct st_pio_control *st_get_pio_control( 367 struct pinctrl_dev *pctldev, int pin) 368 { 369 struct pinctrl_gpio_range *range = 370 pinctrl_find_gpio_range_from_pin(pctldev, pin); 371 struct st_gpio_bank *bank = gpio_range_to_bank(range); 372 373 return &bank->pc; 374 } 375 376 /* Low level functions.. */ 377 static inline int st_gpio_bank(int gpio) 378 { 379 return gpio/ST_GPIO_PINS_PER_BANK; 380 } 381 382 static inline int st_gpio_pin(int gpio) 383 { 384 return gpio%ST_GPIO_PINS_PER_BANK; 385 } 386 387 static void st_pinconf_set_config(struct st_pio_control *pc, 388 int pin, unsigned long config) 389 { 390 struct regmap_field *output_enable = pc->oe; 391 struct regmap_field *pull_up = pc->pu; 392 struct regmap_field *open_drain = pc->od; 393 unsigned int oe_value, pu_value, od_value; 394 unsigned long mask = BIT(pin); 395 396 if (output_enable) { 397 regmap_field_read(output_enable, &oe_value); 398 oe_value &= ~mask; 399 if (config & ST_PINCONF_OE) 400 oe_value |= mask; 401 regmap_field_write(output_enable, oe_value); 402 } 403 404 if (pull_up) { 405 regmap_field_read(pull_up, &pu_value); 406 pu_value &= ~mask; 407 if (config & ST_PINCONF_PU) 408 pu_value |= mask; 409 regmap_field_write(pull_up, pu_value); 410 } 411 412 if (open_drain) { 413 regmap_field_read(open_drain, &od_value); 414 od_value &= ~mask; 415 if (config & ST_PINCONF_OD) 416 od_value |= mask; 417 regmap_field_write(open_drain, od_value); 418 } 419 } 420 421 static void st_pctl_set_function(struct st_pio_control *pc, 422 int pin_id, int function) 423 { 424 struct regmap_field *alt = pc->alt; 425 unsigned int val; 426 int pin = st_gpio_pin(pin_id); 427 int offset = pin * 4; 428 429 if (!alt) 430 return; 431 432 regmap_field_read(alt, &val); 433 val &= ~(0xf << offset); 434 val |= function << offset; 435 regmap_field_write(alt, val); 436 } 437 438 static unsigned int st_pctl_get_pin_function(struct st_pio_control *pc, int pin) 439 { 440 struct regmap_field *alt = pc->alt; 441 unsigned int val; 442 int offset = pin * 4; 443 444 if (!alt) 445 return 0; 446 447 regmap_field_read(alt, &val); 448 449 return (val >> offset) & 0xf; 450 } 451 452 static unsigned long st_pinconf_delay_to_bit(unsigned int delay, 453 const struct st_pctl_data *data, unsigned long config) 454 { 455 const unsigned int *delay_times; 456 int num_delay_times, i, closest_index = -1; 457 unsigned int closest_divergence = UINT_MAX; 458 459 if (ST_PINCONF_UNPACK_OE(config)) { 460 delay_times = data->output_delays; 461 num_delay_times = data->noutput_delays; 462 } else { 463 delay_times = data->input_delays; 464 num_delay_times = data->ninput_delays; 465 } 466 467 for (i = 0; i < num_delay_times; i++) { 468 unsigned int divergence = abs(delay - delay_times[i]); 469 470 if (divergence == 0) 471 return i; 472 473 if (divergence < closest_divergence) { 474 closest_divergence = divergence; 475 closest_index = i; 476 } 477 } 478 479 pr_warn("Attempt to set delay %d, closest available %d\n", 480 delay, delay_times[closest_index]); 481 482 return closest_index; 483 } 484 485 static unsigned long st_pinconf_bit_to_delay(unsigned int index, 486 const struct st_pctl_data *data, unsigned long output) 487 { 488 const unsigned int *delay_times; 489 int num_delay_times; 490 491 if (output) { 492 delay_times = data->output_delays; 493 num_delay_times = data->noutput_delays; 494 } else { 495 delay_times = data->input_delays; 496 num_delay_times = data->ninput_delays; 497 } 498 499 if (index < num_delay_times) { 500 return delay_times[index]; 501 } else { 502 pr_warn("Delay not found in/out delay list\n"); 503 return 0; 504 } 505 } 506 507 static void st_regmap_field_bit_set_clear_pin(struct regmap_field *field, 508 int enable, int pin) 509 { 510 unsigned int val = 0; 511 512 regmap_field_read(field, &val); 513 if (enable) 514 val |= BIT(pin); 515 else 516 val &= ~BIT(pin); 517 regmap_field_write(field, val); 518 } 519 520 static void st_pinconf_set_retime_packed(struct st_pinctrl *info, 521 struct st_pio_control *pc, unsigned long config, int pin) 522 { 523 const struct st_pctl_data *data = info->data; 524 struct st_retime_packed *rt_p = &pc->rt.rt_p; 525 unsigned int delay; 526 527 st_regmap_field_bit_set_clear_pin(rt_p->clk1notclk0, 528 ST_PINCONF_UNPACK_RT_CLK(config), pin); 529 530 st_regmap_field_bit_set_clear_pin(rt_p->clknotdata, 531 ST_PINCONF_UNPACK_RT_CLKNOTDATA(config), pin); 532 533 st_regmap_field_bit_set_clear_pin(rt_p->double_edge, 534 ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config), pin); 535 536 st_regmap_field_bit_set_clear_pin(rt_p->invertclk, 537 ST_PINCONF_UNPACK_RT_INVERTCLK(config), pin); 538 539 st_regmap_field_bit_set_clear_pin(rt_p->retime, 540 ST_PINCONF_UNPACK_RT(config), pin); 541 542 delay = st_pinconf_delay_to_bit(ST_PINCONF_UNPACK_RT_DELAY(config), 543 data, config); 544 /* 2 bit delay, lsb */ 545 st_regmap_field_bit_set_clear_pin(rt_p->delay_0, delay & 0x1, pin); 546 /* 2 bit delay, msb */ 547 st_regmap_field_bit_set_clear_pin(rt_p->delay_1, delay & 0x2, pin); 548 } 549 550 static void st_pinconf_set_retime_dedicated(struct st_pinctrl *info, 551 struct st_pio_control *pc, unsigned long config, int pin) 552 { 553 int input = ST_PINCONF_UNPACK_OE(config) ? 0 : 1; 554 int clk = ST_PINCONF_UNPACK_RT_CLK(config); 555 int clknotdata = ST_PINCONF_UNPACK_RT_CLKNOTDATA(config); 556 int double_edge = ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config); 557 int invertclk = ST_PINCONF_UNPACK_RT_INVERTCLK(config); 558 int retime = ST_PINCONF_UNPACK_RT(config); 559 560 unsigned long delay = st_pinconf_delay_to_bit( 561 ST_PINCONF_UNPACK_RT_DELAY(config), 562 info->data, config); 563 struct st_retime_dedicated *rt_d = &pc->rt.rt_d; 564 565 unsigned long retime_config = 566 ((clk) << RT_D_CFG_CLK_SHIFT) | 567 ((delay) << RT_D_CFG_DELAY_SHIFT) | 568 ((input) << RT_D_CFG_DELAY_INNOTOUT_SHIFT) | 569 ((retime) << RT_D_CFG_RETIME_SHIFT) | 570 ((clknotdata) << RT_D_CFG_CLKNOTDATA_SHIFT) | 571 ((invertclk) << RT_D_CFG_INVERTCLK_SHIFT) | 572 ((double_edge) << RT_D_CFG_DOUBLE_EDGE_SHIFT); 573 574 regmap_field_write(rt_d->rt[pin], retime_config); 575 } 576 577 static void st_pinconf_get_direction(struct st_pio_control *pc, 578 int pin, unsigned long *config) 579 { 580 unsigned int oe_value, pu_value, od_value; 581 582 if (pc->oe) { 583 regmap_field_read(pc->oe, &oe_value); 584 if (oe_value & BIT(pin)) 585 ST_PINCONF_PACK_OE(*config); 586 } 587 588 if (pc->pu) { 589 regmap_field_read(pc->pu, &pu_value); 590 if (pu_value & BIT(pin)) 591 ST_PINCONF_PACK_PU(*config); 592 } 593 594 if (pc->od) { 595 regmap_field_read(pc->od, &od_value); 596 if (od_value & BIT(pin)) 597 ST_PINCONF_PACK_OD(*config); 598 } 599 } 600 601 static int st_pinconf_get_retime_packed(struct st_pinctrl *info, 602 struct st_pio_control *pc, int pin, unsigned long *config) 603 { 604 const struct st_pctl_data *data = info->data; 605 struct st_retime_packed *rt_p = &pc->rt.rt_p; 606 unsigned int delay_bits, delay, delay0, delay1, val; 607 int output = ST_PINCONF_UNPACK_OE(*config); 608 609 if (!regmap_field_read(rt_p->retime, &val) && (val & BIT(pin))) 610 ST_PINCONF_PACK_RT(*config); 611 612 if (!regmap_field_read(rt_p->clk1notclk0, &val) && (val & BIT(pin))) 613 ST_PINCONF_PACK_RT_CLK(*config, 1); 614 615 if (!regmap_field_read(rt_p->clknotdata, &val) && (val & BIT(pin))) 616 ST_PINCONF_PACK_RT_CLKNOTDATA(*config); 617 618 if (!regmap_field_read(rt_p->double_edge, &val) && (val & BIT(pin))) 619 ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config); 620 621 if (!regmap_field_read(rt_p->invertclk, &val) && (val & BIT(pin))) 622 ST_PINCONF_PACK_RT_INVERTCLK(*config); 623 624 regmap_field_read(rt_p->delay_0, &delay0); 625 regmap_field_read(rt_p->delay_1, &delay1); 626 delay_bits = (((delay1 & BIT(pin)) ? 1 : 0) << 1) | 627 (((delay0 & BIT(pin)) ? 1 : 0)); 628 delay = st_pinconf_bit_to_delay(delay_bits, data, output); 629 ST_PINCONF_PACK_RT_DELAY(*config, delay); 630 631 return 0; 632 } 633 634 static int st_pinconf_get_retime_dedicated(struct st_pinctrl *info, 635 struct st_pio_control *pc, int pin, unsigned long *config) 636 { 637 unsigned int value; 638 unsigned long delay_bits, delay, rt_clk; 639 int output = ST_PINCONF_UNPACK_OE(*config); 640 struct st_retime_dedicated *rt_d = &pc->rt.rt_d; 641 642 regmap_field_read(rt_d->rt[pin], &value); 643 644 rt_clk = (value & RT_D_CFG_CLK_MASK) >> RT_D_CFG_CLK_SHIFT; 645 ST_PINCONF_PACK_RT_CLK(*config, rt_clk); 646 647 delay_bits = (value & RT_D_CFG_DELAY_MASK) >> RT_D_CFG_DELAY_SHIFT; 648 delay = st_pinconf_bit_to_delay(delay_bits, info->data, output); 649 ST_PINCONF_PACK_RT_DELAY(*config, delay); 650 651 if (value & RT_D_CFG_CLKNOTDATA_MASK) 652 ST_PINCONF_PACK_RT_CLKNOTDATA(*config); 653 654 if (value & RT_D_CFG_DOUBLE_EDGE_MASK) 655 ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config); 656 657 if (value & RT_D_CFG_INVERTCLK_MASK) 658 ST_PINCONF_PACK_RT_INVERTCLK(*config); 659 660 if (value & RT_D_CFG_RETIME_MASK) 661 ST_PINCONF_PACK_RT(*config); 662 663 return 0; 664 } 665 666 /* GPIO related functions */ 667 668 static inline void __st_gpio_set(struct st_gpio_bank *bank, 669 unsigned offset, int value) 670 { 671 if (value) 672 writel(BIT(offset), bank->base + REG_PIO_SET_POUT); 673 else 674 writel(BIT(offset), bank->base + REG_PIO_CLR_POUT); 675 } 676 677 static void st_gpio_direction(struct st_gpio_bank *bank, 678 unsigned int gpio, unsigned int direction) 679 { 680 int offset = st_gpio_pin(gpio); 681 int i = 0; 682 /** 683 * There are three configuration registers (PIOn_PC0, PIOn_PC1 684 * and PIOn_PC2) for each port. These are used to configure the 685 * PIO port pins. Each pin can be configured as an input, output, 686 * bidirectional, or alternative function pin. Three bits, one bit 687 * from each of the three registers, configure the corresponding bit of 688 * the port. Valid bit settings is: 689 * 690 * PC2 PC1 PC0 Direction. 691 * 0 0 0 [Input Weak pull-up] 692 * 0 0 or 1 1 [Bidirection] 693 * 0 1 0 [Output] 694 * 1 0 0 [Input] 695 * 696 * PIOn_SET_PC and PIOn_CLR_PC registers are used to set and clear bits 697 * individually. 698 */ 699 for (i = 0; i <= 2; i++) { 700 if (direction & BIT(i)) 701 writel(BIT(offset), bank->base + REG_PIO_SET_PC(i)); 702 else 703 writel(BIT(offset), bank->base + REG_PIO_CLR_PC(i)); 704 } 705 } 706 707 static int st_gpio_get(struct gpio_chip *chip, unsigned offset) 708 { 709 struct st_gpio_bank *bank = gpiochip_get_data(chip); 710 711 return !!(readl(bank->base + REG_PIO_PIN) & BIT(offset)); 712 } 713 714 static void st_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 715 { 716 struct st_gpio_bank *bank = gpiochip_get_data(chip); 717 __st_gpio_set(bank, offset, value); 718 } 719 720 static int st_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 721 { 722 pinctrl_gpio_direction_input(chip->base + offset); 723 724 return 0; 725 } 726 727 static int st_gpio_direction_output(struct gpio_chip *chip, 728 unsigned offset, int value) 729 { 730 struct st_gpio_bank *bank = gpiochip_get_data(chip); 731 732 __st_gpio_set(bank, offset, value); 733 pinctrl_gpio_direction_output(chip->base + offset); 734 735 return 0; 736 } 737 738 static int st_gpio_get_direction(struct gpio_chip *chip, unsigned offset) 739 { 740 struct st_gpio_bank *bank = gpiochip_get_data(chip); 741 struct st_pio_control pc = bank->pc; 742 unsigned long config; 743 unsigned int direction = 0; 744 unsigned int function; 745 unsigned int value; 746 int i = 0; 747 748 /* Alternate function direction is handled by Pinctrl */ 749 function = st_pctl_get_pin_function(&pc, offset); 750 if (function) { 751 st_pinconf_get_direction(&pc, offset, &config); 752 if (ST_PINCONF_UNPACK_OE(config)) 753 return GPIO_LINE_DIRECTION_OUT; 754 755 return GPIO_LINE_DIRECTION_IN; 756 } 757 758 /* 759 * GPIO direction is handled differently 760 * - See st_gpio_direction() above for an explanation 761 */ 762 for (i = 0; i <= 2; i++) { 763 value = readl(bank->base + REG_PIO_PC(i)); 764 direction |= ((value >> offset) & 0x1) << i; 765 } 766 767 if (direction == ST_GPIO_DIRECTION_IN) 768 return GPIO_LINE_DIRECTION_IN; 769 770 return GPIO_LINE_DIRECTION_OUT; 771 } 772 773 /* Pinctrl Groups */ 774 static int st_pctl_get_groups_count(struct pinctrl_dev *pctldev) 775 { 776 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 777 778 return info->ngroups; 779 } 780 781 static const char *st_pctl_get_group_name(struct pinctrl_dev *pctldev, 782 unsigned selector) 783 { 784 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 785 786 return info->groups[selector].name; 787 } 788 789 static int st_pctl_get_group_pins(struct pinctrl_dev *pctldev, 790 unsigned selector, const unsigned **pins, unsigned *npins) 791 { 792 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 793 794 if (selector >= info->ngroups) 795 return -EINVAL; 796 797 *pins = info->groups[selector].pins; 798 *npins = info->groups[selector].npins; 799 800 return 0; 801 } 802 803 static inline const struct st_pctl_group *st_pctl_find_group_by_name( 804 const struct st_pinctrl *info, const char *name) 805 { 806 int i; 807 808 for (i = 0; i < info->ngroups; i++) { 809 if (!strcmp(info->groups[i].name, name)) 810 return &info->groups[i]; 811 } 812 813 return NULL; 814 } 815 816 static int st_pctl_dt_node_to_map(struct pinctrl_dev *pctldev, 817 struct device_node *np, struct pinctrl_map **map, unsigned *num_maps) 818 { 819 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 820 const struct st_pctl_group *grp; 821 struct device *dev = info->dev; 822 struct pinctrl_map *new_map; 823 struct device_node *parent; 824 int map_num, i; 825 826 grp = st_pctl_find_group_by_name(info, np->name); 827 if (!grp) { 828 dev_err(dev, "unable to find group for node %pOFn\n", np); 829 return -EINVAL; 830 } 831 832 map_num = grp->npins + 1; 833 new_map = devm_kcalloc(dev, map_num, sizeof(*new_map), GFP_KERNEL); 834 if (!new_map) 835 return -ENOMEM; 836 837 parent = of_get_parent(np); 838 if (!parent) { 839 devm_kfree(dev, new_map); 840 return -EINVAL; 841 } 842 843 *map = new_map; 844 *num_maps = map_num; 845 new_map[0].type = PIN_MAP_TYPE_MUX_GROUP; 846 new_map[0].data.mux.function = parent->name; 847 new_map[0].data.mux.group = np->name; 848 of_node_put(parent); 849 850 /* create config map per pin */ 851 new_map++; 852 for (i = 0; i < grp->npins; i++) { 853 new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN; 854 new_map[i].data.configs.group_or_pin = 855 pin_get_name(pctldev, grp->pins[i]); 856 new_map[i].data.configs.configs = &grp->pin_conf[i].config; 857 new_map[i].data.configs.num_configs = 1; 858 } 859 dev_info(dev, "maps: function %s group %s num %d\n", 860 (*map)->data.mux.function, grp->name, map_num); 861 862 return 0; 863 } 864 865 static void st_pctl_dt_free_map(struct pinctrl_dev *pctldev, 866 struct pinctrl_map *map, unsigned num_maps) 867 { 868 } 869 870 static const struct pinctrl_ops st_pctlops = { 871 .get_groups_count = st_pctl_get_groups_count, 872 .get_group_pins = st_pctl_get_group_pins, 873 .get_group_name = st_pctl_get_group_name, 874 .dt_node_to_map = st_pctl_dt_node_to_map, 875 .dt_free_map = st_pctl_dt_free_map, 876 }; 877 878 /* Pinmux */ 879 static int st_pmx_get_funcs_count(struct pinctrl_dev *pctldev) 880 { 881 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 882 883 return info->nfunctions; 884 } 885 886 static const char *st_pmx_get_fname(struct pinctrl_dev *pctldev, 887 unsigned selector) 888 { 889 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 890 891 return info->functions[selector].name; 892 } 893 894 static int st_pmx_get_groups(struct pinctrl_dev *pctldev, 895 unsigned selector, const char * const **grps, unsigned * const ngrps) 896 { 897 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 898 *grps = info->functions[selector].groups; 899 *ngrps = info->functions[selector].ngroups; 900 901 return 0; 902 } 903 904 static int st_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned fselector, 905 unsigned group) 906 { 907 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 908 struct st_pinconf *conf = info->groups[group].pin_conf; 909 struct st_pio_control *pc; 910 int i; 911 912 for (i = 0; i < info->groups[group].npins; i++) { 913 pc = st_get_pio_control(pctldev, conf[i].pin); 914 st_pctl_set_function(pc, conf[i].pin, conf[i].altfunc); 915 } 916 917 return 0; 918 } 919 920 static int st_pmx_set_gpio_direction(struct pinctrl_dev *pctldev, 921 struct pinctrl_gpio_range *range, unsigned gpio, 922 bool input) 923 { 924 struct st_gpio_bank *bank = gpio_range_to_bank(range); 925 /* 926 * When a PIO bank is used in its primary function mode (altfunc = 0) 927 * Output Enable (OE), Open Drain(OD), and Pull Up (PU) 928 * for the primary PIO functions are driven by the related PIO block 929 */ 930 st_pctl_set_function(&bank->pc, gpio, 0); 931 st_gpio_direction(bank, gpio, input ? 932 ST_GPIO_DIRECTION_IN : ST_GPIO_DIRECTION_OUT); 933 934 return 0; 935 } 936 937 static const struct pinmux_ops st_pmxops = { 938 .get_functions_count = st_pmx_get_funcs_count, 939 .get_function_name = st_pmx_get_fname, 940 .get_function_groups = st_pmx_get_groups, 941 .set_mux = st_pmx_set_mux, 942 .gpio_set_direction = st_pmx_set_gpio_direction, 943 .strict = true, 944 }; 945 946 /* Pinconf */ 947 static void st_pinconf_get_retime(struct st_pinctrl *info, 948 struct st_pio_control *pc, int pin, unsigned long *config) 949 { 950 if (info->data->rt_style == st_retime_style_packed) 951 st_pinconf_get_retime_packed(info, pc, pin, config); 952 else if (info->data->rt_style == st_retime_style_dedicated) 953 if ((BIT(pin) & pc->rt_pin_mask)) 954 st_pinconf_get_retime_dedicated(info, pc, 955 pin, config); 956 } 957 958 static void st_pinconf_set_retime(struct st_pinctrl *info, 959 struct st_pio_control *pc, int pin, unsigned long config) 960 { 961 if (info->data->rt_style == st_retime_style_packed) 962 st_pinconf_set_retime_packed(info, pc, config, pin); 963 else if (info->data->rt_style == st_retime_style_dedicated) 964 if ((BIT(pin) & pc->rt_pin_mask)) 965 st_pinconf_set_retime_dedicated(info, pc, 966 config, pin); 967 } 968 969 static int st_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin_id, 970 unsigned long *configs, unsigned num_configs) 971 { 972 int pin = st_gpio_pin(pin_id); 973 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 974 struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id); 975 int i; 976 977 for (i = 0; i < num_configs; i++) { 978 st_pinconf_set_config(pc, pin, configs[i]); 979 st_pinconf_set_retime(info, pc, pin, configs[i]); 980 } /* for each config */ 981 982 return 0; 983 } 984 985 static int st_pinconf_get(struct pinctrl_dev *pctldev, 986 unsigned pin_id, unsigned long *config) 987 { 988 int pin = st_gpio_pin(pin_id); 989 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 990 struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id); 991 992 *config = 0; 993 st_pinconf_get_direction(pc, pin, config); 994 st_pinconf_get_retime(info, pc, pin, config); 995 996 return 0; 997 } 998 999 static void st_pinconf_dbg_show(struct pinctrl_dev *pctldev, 1000 struct seq_file *s, unsigned pin_id) 1001 { 1002 struct st_pio_control *pc; 1003 unsigned long config; 1004 unsigned int function; 1005 int offset = st_gpio_pin(pin_id); 1006 char f[16]; 1007 int oe; 1008 1009 mutex_unlock(&pctldev->mutex); 1010 pc = st_get_pio_control(pctldev, pin_id); 1011 st_pinconf_get(pctldev, pin_id, &config); 1012 mutex_lock(&pctldev->mutex); 1013 1014 function = st_pctl_get_pin_function(pc, offset); 1015 if (function) 1016 snprintf(f, 10, "Alt Fn %u", function); 1017 else 1018 snprintf(f, 5, "GPIO"); 1019 1020 oe = st_gpio_get_direction(&pc_to_bank(pc)->gpio_chip, offset); 1021 seq_printf(s, "[OE:%d,PU:%ld,OD:%ld]\t%s\n" 1022 "\t\t[retime:%ld,invclk:%ld,clknotdat:%ld," 1023 "de:%ld,rt-clk:%ld,rt-delay:%ld]", 1024 (oe == GPIO_LINE_DIRECTION_OUT), 1025 ST_PINCONF_UNPACK_PU(config), 1026 ST_PINCONF_UNPACK_OD(config), 1027 f, 1028 ST_PINCONF_UNPACK_RT(config), 1029 ST_PINCONF_UNPACK_RT_INVERTCLK(config), 1030 ST_PINCONF_UNPACK_RT_CLKNOTDATA(config), 1031 ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config), 1032 ST_PINCONF_UNPACK_RT_CLK(config), 1033 ST_PINCONF_UNPACK_RT_DELAY(config)); 1034 } 1035 1036 static const struct pinconf_ops st_confops = { 1037 .pin_config_get = st_pinconf_get, 1038 .pin_config_set = st_pinconf_set, 1039 .pin_config_dbg_show = st_pinconf_dbg_show, 1040 }; 1041 1042 static void st_pctl_dt_child_count(struct st_pinctrl *info, 1043 struct device_node *np) 1044 { 1045 struct device_node *child; 1046 for_each_child_of_node(np, child) { 1047 if (of_property_read_bool(child, "gpio-controller")) { 1048 info->nbanks++; 1049 } else { 1050 info->nfunctions++; 1051 info->ngroups += of_get_child_count(child); 1052 } 1053 } 1054 } 1055 1056 static int st_pctl_dt_setup_retime_packed(struct st_pinctrl *info, 1057 int bank, struct st_pio_control *pc) 1058 { 1059 struct device *dev = info->dev; 1060 struct regmap *rm = info->regmap; 1061 const struct st_pctl_data *data = info->data; 1062 /* 2 registers per bank */ 1063 int reg = (data->rt + bank * RT_P_CFGS_PER_BANK) * 4; 1064 struct st_retime_packed *rt_p = &pc->rt.rt_p; 1065 /* cfg0 */ 1066 struct reg_field clk1notclk0 = RT_P_CFG0_CLK1NOTCLK0_FIELD(reg); 1067 struct reg_field delay_0 = RT_P_CFG0_DELAY_0_FIELD(reg); 1068 struct reg_field delay_1 = RT_P_CFG0_DELAY_1_FIELD(reg); 1069 /* cfg1 */ 1070 struct reg_field invertclk = RT_P_CFG1_INVERTCLK_FIELD(reg + 4); 1071 struct reg_field retime = RT_P_CFG1_RETIME_FIELD(reg + 4); 1072 struct reg_field clknotdata = RT_P_CFG1_CLKNOTDATA_FIELD(reg + 4); 1073 struct reg_field double_edge = RT_P_CFG1_DOUBLE_EDGE_FIELD(reg + 4); 1074 1075 rt_p->clk1notclk0 = devm_regmap_field_alloc(dev, rm, clk1notclk0); 1076 rt_p->delay_0 = devm_regmap_field_alloc(dev, rm, delay_0); 1077 rt_p->delay_1 = devm_regmap_field_alloc(dev, rm, delay_1); 1078 rt_p->invertclk = devm_regmap_field_alloc(dev, rm, invertclk); 1079 rt_p->retime = devm_regmap_field_alloc(dev, rm, retime); 1080 rt_p->clknotdata = devm_regmap_field_alloc(dev, rm, clknotdata); 1081 rt_p->double_edge = devm_regmap_field_alloc(dev, rm, double_edge); 1082 1083 if (IS_ERR(rt_p->clk1notclk0) || IS_ERR(rt_p->delay_0) || 1084 IS_ERR(rt_p->delay_1) || IS_ERR(rt_p->invertclk) || 1085 IS_ERR(rt_p->retime) || IS_ERR(rt_p->clknotdata) || 1086 IS_ERR(rt_p->double_edge)) 1087 return -EINVAL; 1088 1089 return 0; 1090 } 1091 1092 static int st_pctl_dt_setup_retime_dedicated(struct st_pinctrl *info, 1093 int bank, struct st_pio_control *pc) 1094 { 1095 struct device *dev = info->dev; 1096 struct regmap *rm = info->regmap; 1097 const struct st_pctl_data *data = info->data; 1098 /* 8 registers per bank */ 1099 int reg_offset = (data->rt + bank * RT_D_CFGS_PER_BANK) * 4; 1100 struct st_retime_dedicated *rt_d = &pc->rt.rt_d; 1101 unsigned int j; 1102 u32 pin_mask = pc->rt_pin_mask; 1103 1104 for (j = 0; j < RT_D_CFGS_PER_BANK; j++) { 1105 if (BIT(j) & pin_mask) { 1106 struct reg_field reg = REG_FIELD(reg_offset, 0, 31); 1107 rt_d->rt[j] = devm_regmap_field_alloc(dev, rm, reg); 1108 if (IS_ERR(rt_d->rt[j])) 1109 return -EINVAL; 1110 reg_offset += 4; 1111 } 1112 } 1113 return 0; 1114 } 1115 1116 static int st_pctl_dt_setup_retime(struct st_pinctrl *info, 1117 int bank, struct st_pio_control *pc) 1118 { 1119 const struct st_pctl_data *data = info->data; 1120 if (data->rt_style == st_retime_style_packed) 1121 return st_pctl_dt_setup_retime_packed(info, bank, pc); 1122 else if (data->rt_style == st_retime_style_dedicated) 1123 return st_pctl_dt_setup_retime_dedicated(info, bank, pc); 1124 1125 return -EINVAL; 1126 } 1127 1128 1129 static struct regmap_field *st_pc_get_value(struct device *dev, 1130 struct regmap *regmap, int bank, 1131 int data, int lsb, int msb) 1132 { 1133 struct reg_field reg = REG_FIELD((data + bank) * 4, lsb, msb); 1134 1135 if (data < 0) 1136 return NULL; 1137 1138 return devm_regmap_field_alloc(dev, regmap, reg); 1139 } 1140 1141 static void st_parse_syscfgs(struct st_pinctrl *info, int bank, 1142 struct device_node *np) 1143 { 1144 const struct st_pctl_data *data = info->data; 1145 /** 1146 * For a given shared register like OE/PU/OD, there are 8 bits per bank 1147 * 0:7 belongs to bank0, 8:15 belongs to bank1 ... 1148 * So each register is shared across 4 banks. 1149 */ 1150 int lsb = (bank%4) * ST_GPIO_PINS_PER_BANK; 1151 int msb = lsb + ST_GPIO_PINS_PER_BANK - 1; 1152 struct st_pio_control *pc = &info->banks[bank].pc; 1153 struct device *dev = info->dev; 1154 struct regmap *regmap = info->regmap; 1155 1156 pc->alt = st_pc_get_value(dev, regmap, bank, data->alt, 0, 31); 1157 pc->oe = st_pc_get_value(dev, regmap, bank/4, data->oe, lsb, msb); 1158 pc->pu = st_pc_get_value(dev, regmap, bank/4, data->pu, lsb, msb); 1159 pc->od = st_pc_get_value(dev, regmap, bank/4, data->od, lsb, msb); 1160 1161 /* retime avaiable for all pins by default */ 1162 pc->rt_pin_mask = 0xff; 1163 of_property_read_u32(np, "st,retime-pin-mask", &pc->rt_pin_mask); 1164 st_pctl_dt_setup_retime(info, bank, pc); 1165 1166 return; 1167 } 1168 1169 static int st_pctl_dt_calculate_pin(struct st_pinctrl *info, 1170 phandle bank, unsigned int offset) 1171 { 1172 struct device_node *np; 1173 struct gpio_chip *chip; 1174 int retval = -EINVAL; 1175 int i; 1176 1177 np = of_find_node_by_phandle(bank); 1178 if (!np) 1179 return -EINVAL; 1180 1181 for (i = 0; i < info->nbanks; i++) { 1182 chip = &info->banks[i].gpio_chip; 1183 if (chip->fwnode == of_fwnode_handle(np)) { 1184 if (offset < chip->ngpio) 1185 retval = chip->base + offset; 1186 break; 1187 } 1188 } 1189 1190 of_node_put(np); 1191 return retval; 1192 } 1193 1194 /* 1195 * Each pin is represented in of the below forms. 1196 * <bank offset mux direction rt_type rt_delay rt_clk> 1197 */ 1198 static int st_pctl_dt_parse_groups(struct device_node *np, 1199 struct st_pctl_group *grp, struct st_pinctrl *info, int idx) 1200 { 1201 /* bank pad direction val altfunction */ 1202 const __be32 *list; 1203 struct property *pp; 1204 struct device *dev = info->dev; 1205 struct st_pinconf *conf; 1206 struct device_node *pins; 1207 phandle bank; 1208 unsigned int offset; 1209 int i = 0, npins = 0, nr_props, ret = 0; 1210 1211 pins = of_get_child_by_name(np, "st,pins"); 1212 if (!pins) 1213 return -ENODATA; 1214 1215 for_each_property_of_node(pins, pp) { 1216 /* Skip those we do not want to proceed */ 1217 if (!strcmp(pp->name, "name")) 1218 continue; 1219 1220 if (pp->length / sizeof(__be32) >= OF_GPIO_ARGS_MIN) { 1221 npins++; 1222 } else { 1223 pr_warn("Invalid st,pins in %pOFn node\n", np); 1224 ret = -EINVAL; 1225 goto out_put_node; 1226 } 1227 } 1228 1229 grp->npins = npins; 1230 grp->name = np->name; 1231 grp->pins = devm_kcalloc(dev, npins, sizeof(*grp->pins), GFP_KERNEL); 1232 grp->pin_conf = devm_kcalloc(dev, npins, sizeof(*grp->pin_conf), GFP_KERNEL); 1233 1234 if (!grp->pins || !grp->pin_conf) { 1235 ret = -ENOMEM; 1236 goto out_put_node; 1237 } 1238 1239 /* <bank offset mux direction rt_type rt_delay rt_clk> */ 1240 for_each_property_of_node(pins, pp) { 1241 if (!strcmp(pp->name, "name")) 1242 continue; 1243 nr_props = pp->length/sizeof(u32); 1244 list = pp->value; 1245 conf = &grp->pin_conf[i]; 1246 1247 /* bank & offset */ 1248 bank = be32_to_cpup(list++); 1249 offset = be32_to_cpup(list++); 1250 conf->pin = st_pctl_dt_calculate_pin(info, bank, offset); 1251 conf->name = pp->name; 1252 grp->pins[i] = conf->pin; 1253 /* mux */ 1254 conf->altfunc = be32_to_cpup(list++); 1255 conf->config = 0; 1256 /* direction */ 1257 conf->config |= be32_to_cpup(list++); 1258 /* rt_type rt_delay rt_clk */ 1259 if (nr_props >= OF_GPIO_ARGS_MIN + OF_RT_ARGS_MIN) { 1260 /* rt_type */ 1261 conf->config |= be32_to_cpup(list++); 1262 /* rt_delay */ 1263 conf->config |= be32_to_cpup(list++); 1264 /* rt_clk */ 1265 if (nr_props > OF_GPIO_ARGS_MIN + OF_RT_ARGS_MIN) 1266 conf->config |= be32_to_cpup(list++); 1267 } 1268 i++; 1269 } 1270 1271 out_put_node: 1272 of_node_put(pins); 1273 1274 return ret; 1275 } 1276 1277 static int st_pctl_parse_functions(struct device_node *np, 1278 struct st_pinctrl *info, u32 index, int *grp_index) 1279 { 1280 struct device *dev = info->dev; 1281 struct device_node *child; 1282 struct st_pmx_func *func; 1283 struct st_pctl_group *grp; 1284 int ret, i; 1285 1286 func = &info->functions[index]; 1287 func->name = np->name; 1288 func->ngroups = of_get_child_count(np); 1289 if (func->ngroups == 0) 1290 return dev_err_probe(dev, -EINVAL, "No groups defined\n"); 1291 func->groups = devm_kcalloc(dev, func->ngroups, sizeof(*func->groups), GFP_KERNEL); 1292 if (!func->groups) 1293 return -ENOMEM; 1294 1295 i = 0; 1296 for_each_child_of_node(np, child) { 1297 func->groups[i] = child->name; 1298 grp = &info->groups[*grp_index]; 1299 *grp_index += 1; 1300 ret = st_pctl_dt_parse_groups(child, grp, info, i++); 1301 if (ret) { 1302 of_node_put(child); 1303 return ret; 1304 } 1305 } 1306 dev_info(dev, "Function[%d\t name:%s,\tgroups:%d]\n", index, func->name, func->ngroups); 1307 1308 return 0; 1309 } 1310 1311 static void st_gpio_irq_mask(struct irq_data *d) 1312 { 1313 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1314 struct st_gpio_bank *bank = gpiochip_get_data(gc); 1315 1316 writel(BIT(irqd_to_hwirq(d)), bank->base + REG_PIO_CLR_PMASK); 1317 gpiochip_disable_irq(gc, irqd_to_hwirq(d)); 1318 } 1319 1320 static void st_gpio_irq_unmask(struct irq_data *d) 1321 { 1322 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1323 struct st_gpio_bank *bank = gpiochip_get_data(gc); 1324 1325 gpiochip_enable_irq(gc, irqd_to_hwirq(d)); 1326 writel(BIT(irqd_to_hwirq(d)), bank->base + REG_PIO_SET_PMASK); 1327 } 1328 1329 static int st_gpio_irq_request_resources(struct irq_data *d) 1330 { 1331 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1332 1333 st_gpio_direction_input(gc, d->hwirq); 1334 1335 return gpiochip_reqres_irq(gc, d->hwirq); 1336 } 1337 1338 static void st_gpio_irq_release_resources(struct irq_data *d) 1339 { 1340 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1341 1342 gpiochip_relres_irq(gc, d->hwirq); 1343 } 1344 1345 static int st_gpio_irq_set_type(struct irq_data *d, unsigned type) 1346 { 1347 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1348 struct st_gpio_bank *bank = gpiochip_get_data(gc); 1349 unsigned long flags; 1350 int comp, pin = d->hwirq; 1351 u32 val; 1352 u32 pin_edge_conf = 0; 1353 1354 switch (type) { 1355 case IRQ_TYPE_LEVEL_HIGH: 1356 comp = 0; 1357 break; 1358 case IRQ_TYPE_EDGE_FALLING: 1359 comp = 0; 1360 pin_edge_conf = ST_IRQ_FALLING_EDGE_CONF(pin); 1361 break; 1362 case IRQ_TYPE_LEVEL_LOW: 1363 comp = 1; 1364 break; 1365 case IRQ_TYPE_EDGE_RISING: 1366 comp = 1; 1367 pin_edge_conf = ST_IRQ_RISING_EDGE_CONF(pin); 1368 break; 1369 case IRQ_TYPE_EDGE_BOTH: 1370 comp = st_gpio_get(&bank->gpio_chip, pin); 1371 pin_edge_conf = ST_IRQ_BOTH_EDGE_CONF(pin); 1372 break; 1373 default: 1374 return -EINVAL; 1375 } 1376 1377 spin_lock_irqsave(&bank->lock, flags); 1378 bank->irq_edge_conf &= ~(ST_IRQ_EDGE_MASK << ( 1379 pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN)); 1380 bank->irq_edge_conf |= pin_edge_conf; 1381 spin_unlock_irqrestore(&bank->lock, flags); 1382 1383 val = readl(bank->base + REG_PIO_PCOMP); 1384 val &= ~BIT(pin); 1385 val |= (comp << pin); 1386 writel(val, bank->base + REG_PIO_PCOMP); 1387 1388 return 0; 1389 } 1390 1391 /* 1392 * As edge triggers are not supported at hardware level, it is supported by 1393 * software by exploiting the level trigger support in hardware. 1394 * 1395 * Steps for detection raising edge interrupt in software. 1396 * 1397 * Step 1: CONFIGURE pin to detect level LOW interrupts. 1398 * 1399 * Step 2: DETECT level LOW interrupt and in irqmux/gpio bank interrupt handler, 1400 * if the value of pin is low, then CONFIGURE pin for level HIGH interrupt. 1401 * IGNORE calling the actual interrupt handler for the pin at this stage. 1402 * 1403 * Step 3: DETECT level HIGH interrupt and in irqmux/gpio-bank interrupt handler 1404 * if the value of pin is HIGH, CONFIGURE pin for level LOW interrupt and then 1405 * DISPATCH the interrupt to the interrupt handler of the pin. 1406 * 1407 * step-1 ________ __________ 1408 * | | step - 3 1409 * | | 1410 * step -2 |_____| 1411 * 1412 * falling edge is also detected int the same way. 1413 * 1414 */ 1415 static void __gpio_irq_handler(struct st_gpio_bank *bank) 1416 { 1417 unsigned long port_in, port_mask, port_comp, active_irqs; 1418 unsigned long bank_edge_mask, flags; 1419 int n, val, ecfg; 1420 1421 spin_lock_irqsave(&bank->lock, flags); 1422 bank_edge_mask = bank->irq_edge_conf; 1423 spin_unlock_irqrestore(&bank->lock, flags); 1424 1425 for (;;) { 1426 port_in = readl(bank->base + REG_PIO_PIN); 1427 port_comp = readl(bank->base + REG_PIO_PCOMP); 1428 port_mask = readl(bank->base + REG_PIO_PMASK); 1429 1430 active_irqs = (port_in ^ port_comp) & port_mask; 1431 1432 if (active_irqs == 0) 1433 break; 1434 1435 for_each_set_bit(n, &active_irqs, BITS_PER_LONG) { 1436 /* check if we are detecting fake edges ... */ 1437 ecfg = ST_IRQ_EDGE_CONF(bank_edge_mask, n); 1438 1439 if (ecfg) { 1440 /* edge detection. */ 1441 val = st_gpio_get(&bank->gpio_chip, n); 1442 1443 writel(BIT(n), 1444 val ? bank->base + REG_PIO_SET_PCOMP : 1445 bank->base + REG_PIO_CLR_PCOMP); 1446 1447 if (ecfg != ST_IRQ_EDGE_BOTH && 1448 !((ecfg & ST_IRQ_EDGE_FALLING) ^ val)) 1449 continue; 1450 } 1451 1452 generic_handle_domain_irq(bank->gpio_chip.irq.domain, n); 1453 } 1454 } 1455 } 1456 1457 static void st_gpio_irq_handler(struct irq_desc *desc) 1458 { 1459 /* interrupt dedicated per bank */ 1460 struct irq_chip *chip = irq_desc_get_chip(desc); 1461 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 1462 struct st_gpio_bank *bank = gpiochip_get_data(gc); 1463 1464 chained_irq_enter(chip, desc); 1465 __gpio_irq_handler(bank); 1466 chained_irq_exit(chip, desc); 1467 } 1468 1469 static void st_gpio_irqmux_handler(struct irq_desc *desc) 1470 { 1471 struct irq_chip *chip = irq_desc_get_chip(desc); 1472 struct st_pinctrl *info = irq_desc_get_handler_data(desc); 1473 unsigned long status; 1474 int n; 1475 1476 chained_irq_enter(chip, desc); 1477 1478 status = readl(info->irqmux_base); 1479 1480 for_each_set_bit(n, &status, info->nbanks) 1481 __gpio_irq_handler(&info->banks[n]); 1482 1483 chained_irq_exit(chip, desc); 1484 } 1485 1486 static const struct gpio_chip st_gpio_template = { 1487 .request = gpiochip_generic_request, 1488 .free = gpiochip_generic_free, 1489 .get = st_gpio_get, 1490 .set = st_gpio_set, 1491 .direction_input = st_gpio_direction_input, 1492 .direction_output = st_gpio_direction_output, 1493 .get_direction = st_gpio_get_direction, 1494 .ngpio = ST_GPIO_PINS_PER_BANK, 1495 }; 1496 1497 static const struct irq_chip st_gpio_irqchip = { 1498 .name = "GPIO", 1499 .irq_request_resources = st_gpio_irq_request_resources, 1500 .irq_release_resources = st_gpio_irq_release_resources, 1501 .irq_disable = st_gpio_irq_mask, 1502 .irq_mask = st_gpio_irq_mask, 1503 .irq_unmask = st_gpio_irq_unmask, 1504 .irq_set_type = st_gpio_irq_set_type, 1505 .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_IMMUTABLE, 1506 }; 1507 1508 static int st_gpiolib_register_bank(struct st_pinctrl *info, 1509 int bank_nr, struct device_node *np) 1510 { 1511 struct st_gpio_bank *bank = &info->banks[bank_nr]; 1512 struct pinctrl_gpio_range *range = &bank->range; 1513 struct device *dev = info->dev; 1514 int bank_num = of_alias_get_id(np, "gpio"); 1515 struct resource res, irq_res; 1516 int err; 1517 1518 if (of_address_to_resource(np, 0, &res)) 1519 return -ENODEV; 1520 1521 bank->base = devm_ioremap_resource(dev, &res); 1522 if (IS_ERR(bank->base)) 1523 return PTR_ERR(bank->base); 1524 1525 bank->gpio_chip = st_gpio_template; 1526 bank->gpio_chip.base = bank_num * ST_GPIO_PINS_PER_BANK; 1527 bank->gpio_chip.ngpio = ST_GPIO_PINS_PER_BANK; 1528 bank->gpio_chip.fwnode = of_fwnode_handle(np); 1529 bank->gpio_chip.parent = dev; 1530 spin_lock_init(&bank->lock); 1531 1532 of_property_read_string(np, "st,bank-name", &range->name); 1533 bank->gpio_chip.label = range->name; 1534 1535 range->id = bank_num; 1536 range->pin_base = range->base = range->id * ST_GPIO_PINS_PER_BANK; 1537 range->npins = bank->gpio_chip.ngpio; 1538 range->gc = &bank->gpio_chip; 1539 1540 /** 1541 * GPIO bank can have one of the two possible types of 1542 * interrupt-wirings. 1543 * 1544 * First type is via irqmux, single interrupt is used by multiple 1545 * gpio banks. This reduces number of overall interrupts numbers 1546 * required. All these banks belong to a single pincontroller. 1547 * _________ 1548 * | |----> [gpio-bank (n) ] 1549 * | |----> [gpio-bank (n + 1)] 1550 * [irqN]-- | irq-mux |----> [gpio-bank (n + 2)] 1551 * | |----> [gpio-bank (... )] 1552 * |_________|----> [gpio-bank (n + 7)] 1553 * 1554 * Second type has a dedicated interrupt per each gpio bank. 1555 * 1556 * [irqN]----> [gpio-bank (n)] 1557 */ 1558 1559 if (of_irq_to_resource(np, 0, &irq_res) > 0) { 1560 struct gpio_irq_chip *girq; 1561 int gpio_irq = irq_res.start; 1562 1563 /* This is not a valid IRQ */ 1564 if (gpio_irq <= 0) { 1565 dev_err(dev, "invalid IRQ for %pOF bank\n", np); 1566 goto skip_irq; 1567 } 1568 /* We need to have a mux as well */ 1569 if (!info->irqmux_base) { 1570 dev_err(dev, "no irqmux for %pOF bank\n", np); 1571 goto skip_irq; 1572 } 1573 1574 girq = &bank->gpio_chip.irq; 1575 gpio_irq_chip_set_chip(girq, &st_gpio_irqchip); 1576 girq->parent_handler = st_gpio_irq_handler; 1577 girq->num_parents = 1; 1578 girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents), 1579 GFP_KERNEL); 1580 if (!girq->parents) 1581 return -ENOMEM; 1582 girq->parents[0] = gpio_irq; 1583 girq->default_type = IRQ_TYPE_NONE; 1584 girq->handler = handle_simple_irq; 1585 } 1586 1587 skip_irq: 1588 err = gpiochip_add_data(&bank->gpio_chip, bank); 1589 if (err) 1590 return dev_err_probe(dev, err, "Failed to add gpiochip(%d)!\n", bank_num); 1591 dev_info(dev, "%s bank added.\n", range->name); 1592 1593 return 0; 1594 } 1595 1596 static const struct of_device_id st_pctl_of_match[] = { 1597 { .compatible = "st,stih407-sbc-pinctrl", .data = &stih407_data}, 1598 { .compatible = "st,stih407-front-pinctrl", .data = &stih407_data}, 1599 { .compatible = "st,stih407-rear-pinctrl", .data = &stih407_data}, 1600 { .compatible = "st,stih407-flash-pinctrl", .data = &stih407_flashdata}, 1601 { /* sentinel */ } 1602 }; 1603 1604 static int st_pctl_probe_dt(struct platform_device *pdev, 1605 struct pinctrl_desc *pctl_desc, struct st_pinctrl *info) 1606 { 1607 struct device *dev = &pdev->dev; 1608 int ret = 0; 1609 int i = 0, j = 0, k = 0, bank; 1610 struct pinctrl_pin_desc *pdesc; 1611 struct device_node *np = dev->of_node; 1612 struct device_node *child; 1613 int grp_index = 0; 1614 int irq = 0; 1615 1616 st_pctl_dt_child_count(info, np); 1617 if (!info->nbanks) 1618 return dev_err_probe(dev, -EINVAL, "you need at least one gpio bank\n"); 1619 1620 dev_info(dev, "nbanks = %d\n", info->nbanks); 1621 dev_info(dev, "nfunctions = %d\n", info->nfunctions); 1622 dev_info(dev, "ngroups = %d\n", info->ngroups); 1623 1624 info->functions = devm_kcalloc(dev, info->nfunctions, sizeof(*info->functions), GFP_KERNEL); 1625 1626 info->groups = devm_kcalloc(dev, info->ngroups, sizeof(*info->groups), GFP_KERNEL); 1627 1628 info->banks = devm_kcalloc(dev, info->nbanks, sizeof(*info->banks), GFP_KERNEL); 1629 1630 if (!info->functions || !info->groups || !info->banks) 1631 return -ENOMEM; 1632 1633 info->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); 1634 if (IS_ERR(info->regmap)) 1635 return dev_err_probe(dev, PTR_ERR(info->regmap), "No syscfg phandle specified\n"); 1636 info->data = of_match_node(st_pctl_of_match, np)->data; 1637 1638 irq = platform_get_irq(pdev, 0); 1639 1640 if (irq > 0) { 1641 info->irqmux_base = devm_platform_ioremap_resource_byname(pdev, "irqmux"); 1642 if (IS_ERR(info->irqmux_base)) 1643 return PTR_ERR(info->irqmux_base); 1644 1645 irq_set_chained_handler_and_data(irq, st_gpio_irqmux_handler, 1646 info); 1647 } 1648 1649 pctl_desc->npins = info->nbanks * ST_GPIO_PINS_PER_BANK; 1650 pdesc = devm_kcalloc(dev, pctl_desc->npins, sizeof(*pdesc), GFP_KERNEL); 1651 if (!pdesc) 1652 return -ENOMEM; 1653 1654 pctl_desc->pins = pdesc; 1655 1656 bank = 0; 1657 for_each_child_of_node(np, child) { 1658 if (of_property_read_bool(child, "gpio-controller")) { 1659 const char *bank_name = NULL; 1660 char **pin_names; 1661 1662 ret = st_gpiolib_register_bank(info, bank, child); 1663 if (ret) { 1664 of_node_put(child); 1665 return ret; 1666 } 1667 1668 k = info->banks[bank].range.pin_base; 1669 bank_name = info->banks[bank].range.name; 1670 1671 pin_names = devm_kasprintf_strarray(dev, bank_name, ST_GPIO_PINS_PER_BANK); 1672 if (IS_ERR(pin_names)) { 1673 of_node_put(child); 1674 return PTR_ERR(pin_names); 1675 } 1676 1677 for (j = 0; j < ST_GPIO_PINS_PER_BANK; j++, k++) { 1678 pdesc->number = k; 1679 pdesc->name = pin_names[j]; 1680 pdesc++; 1681 } 1682 st_parse_syscfgs(info, bank, child); 1683 bank++; 1684 } else { 1685 ret = st_pctl_parse_functions(child, info, 1686 i++, &grp_index); 1687 if (ret) { 1688 dev_err(dev, "No functions found.\n"); 1689 of_node_put(child); 1690 return ret; 1691 } 1692 } 1693 } 1694 1695 return 0; 1696 } 1697 1698 static int st_pctl_probe(struct platform_device *pdev) 1699 { 1700 struct device *dev = &pdev->dev; 1701 struct st_pinctrl *info; 1702 struct pinctrl_desc *pctl_desc; 1703 int ret, i; 1704 1705 if (!dev->of_node) { 1706 dev_err(dev, "device node not found.\n"); 1707 return -EINVAL; 1708 } 1709 1710 pctl_desc = devm_kzalloc(dev, sizeof(*pctl_desc), GFP_KERNEL); 1711 if (!pctl_desc) 1712 return -ENOMEM; 1713 1714 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); 1715 if (!info) 1716 return -ENOMEM; 1717 1718 info->dev = dev; 1719 platform_set_drvdata(pdev, info); 1720 ret = st_pctl_probe_dt(pdev, pctl_desc, info); 1721 if (ret) 1722 return ret; 1723 1724 pctl_desc->owner = THIS_MODULE; 1725 pctl_desc->pctlops = &st_pctlops; 1726 pctl_desc->pmxops = &st_pmxops; 1727 pctl_desc->confops = &st_confops; 1728 pctl_desc->name = dev_name(dev); 1729 1730 info->pctl = devm_pinctrl_register(dev, pctl_desc, info); 1731 if (IS_ERR(info->pctl)) 1732 return dev_err_probe(dev, PTR_ERR(info->pctl), "Failed pinctrl registration\n"); 1733 1734 for (i = 0; i < info->nbanks; i++) 1735 pinctrl_add_gpio_range(info->pctl, &info->banks[i].range); 1736 1737 return 0; 1738 } 1739 1740 static struct platform_driver st_pctl_driver = { 1741 .driver = { 1742 .name = "st-pinctrl", 1743 .of_match_table = st_pctl_of_match, 1744 }, 1745 .probe = st_pctl_probe, 1746 }; 1747 1748 static int __init st_pctl_init(void) 1749 { 1750 return platform_driver_register(&st_pctl_driver); 1751 } 1752 arch_initcall(st_pctl_init); 1753