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