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 gpio_chip_to_bank(chip) \ 207 container_of(chip, struct st_gpio_bank, gpio_chip) 208 209 210 enum st_retime_style { 211 st_retime_style_none, 212 st_retime_style_packed, 213 st_retime_style_dedicated, 214 }; 215 216 struct st_retime_dedicated { 217 struct regmap_field *rt[ST_GPIO_PINS_PER_BANK]; 218 }; 219 220 struct st_retime_packed { 221 struct regmap_field *clk1notclk0; 222 struct regmap_field *delay_0; 223 struct regmap_field *delay_1; 224 struct regmap_field *invertclk; 225 struct regmap_field *retime; 226 struct regmap_field *clknotdata; 227 struct regmap_field *double_edge; 228 }; 229 230 struct st_pio_control { 231 u32 rt_pin_mask; 232 struct regmap_field *alt, *oe, *pu, *od; 233 /* retiming */ 234 union { 235 struct st_retime_packed rt_p; 236 struct st_retime_dedicated rt_d; 237 } rt; 238 }; 239 240 struct st_pctl_data { 241 const enum st_retime_style rt_style; 242 const unsigned int *input_delays; 243 const int ninput_delays; 244 const unsigned int *output_delays; 245 const int noutput_delays; 246 /* register offset information */ 247 const int alt, oe, pu, od, rt; 248 }; 249 250 struct st_pinconf { 251 int pin; 252 const char *name; 253 unsigned long config; 254 int altfunc; 255 }; 256 257 struct st_pmx_func { 258 const char *name; 259 const char **groups; 260 unsigned ngroups; 261 }; 262 263 struct st_pctl_group { 264 const char *name; 265 unsigned int *pins; 266 unsigned npins; 267 struct st_pinconf *pin_conf; 268 }; 269 270 /* 271 * Edge triggers are not supported at hardware level, it is supported by 272 * software by exploiting the level trigger support in hardware. 273 * Software uses a virtual register (EDGE_CONF) for edge trigger configuration 274 * of each gpio pin in a GPIO bank. 275 * 276 * Each bank has a 32 bit EDGE_CONF register which is divided in to 8 parts of 277 * 4-bits. Each 4-bit space is allocated for each pin in a gpio bank. 278 * 279 * bit allocation per pin is: 280 * Bits: [0 - 3] | [4 - 7] [8 - 11] ... ... ... ... [ 28 - 31] 281 * -------------------------------------------------------- 282 * | pin-0 | pin-2 | pin-3 | ... ... ... ... | pin -7 | 283 * -------------------------------------------------------- 284 * 285 * A pin can have one of following the values in its edge configuration field. 286 * 287 * ------- ---------------------------- 288 * [0-3] - Description 289 * ------- ---------------------------- 290 * 0000 - No edge IRQ. 291 * 0001 - Falling edge IRQ. 292 * 0010 - Rising edge IRQ. 293 * 0011 - Rising and Falling edge IRQ. 294 * ------- ---------------------------- 295 */ 296 297 #define ST_IRQ_EDGE_CONF_BITS_PER_PIN 4 298 #define ST_IRQ_EDGE_MASK 0xf 299 #define ST_IRQ_EDGE_FALLING BIT(0) 300 #define ST_IRQ_EDGE_RISING BIT(1) 301 #define ST_IRQ_EDGE_BOTH (BIT(0) | BIT(1)) 302 303 #define ST_IRQ_RISING_EDGE_CONF(pin) \ 304 (ST_IRQ_EDGE_RISING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN)) 305 306 #define ST_IRQ_FALLING_EDGE_CONF(pin) \ 307 (ST_IRQ_EDGE_FALLING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN)) 308 309 #define ST_IRQ_BOTH_EDGE_CONF(pin) \ 310 (ST_IRQ_EDGE_BOTH << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN)) 311 312 #define ST_IRQ_EDGE_CONF(conf, pin) \ 313 (conf >> (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN) & ST_IRQ_EDGE_MASK) 314 315 struct st_gpio_bank { 316 struct gpio_chip gpio_chip; 317 struct pinctrl_gpio_range range; 318 void __iomem *base; 319 struct st_pio_control pc; 320 unsigned long irq_edge_conf; 321 spinlock_t lock; 322 }; 323 324 struct st_pinctrl { 325 struct device *dev; 326 struct pinctrl_dev *pctl; 327 struct st_gpio_bank *banks; 328 int nbanks; 329 struct st_pmx_func *functions; 330 int nfunctions; 331 struct st_pctl_group *groups; 332 int ngroups; 333 struct regmap *regmap; 334 const struct st_pctl_data *data; 335 void __iomem *irqmux_base; 336 }; 337 338 /* SOC specific data */ 339 /* STiH415 data */ 340 static const unsigned int stih415_input_delays[] = {0, 500, 1000, 1500}; 341 static const unsigned int stih415_output_delays[] = {0, 1000, 2000, 3000}; 342 343 #define STIH415_PCTRL_COMMON_DATA \ 344 .rt_style = st_retime_style_packed, \ 345 .input_delays = stih415_input_delays, \ 346 .ninput_delays = ARRAY_SIZE(stih415_input_delays), \ 347 .output_delays = stih415_output_delays, \ 348 .noutput_delays = ARRAY_SIZE(stih415_output_delays) 349 350 static const struct st_pctl_data stih415_sbc_data = { 351 STIH415_PCTRL_COMMON_DATA, 352 .alt = 0, .oe = 5, .pu = 7, .od = 9, .rt = 16, 353 }; 354 355 static const struct st_pctl_data stih415_front_data = { 356 STIH415_PCTRL_COMMON_DATA, 357 .alt = 0, .oe = 8, .pu = 10, .od = 12, .rt = 16, 358 }; 359 360 static const struct st_pctl_data stih415_rear_data = { 361 STIH415_PCTRL_COMMON_DATA, 362 .alt = 0, .oe = 6, .pu = 8, .od = 10, .rt = 38, 363 }; 364 365 static const struct st_pctl_data stih415_left_data = { 366 STIH415_PCTRL_COMMON_DATA, 367 .alt = 0, .oe = 3, .pu = 4, .od = 5, .rt = 6, 368 }; 369 370 static const struct st_pctl_data stih415_right_data = { 371 STIH415_PCTRL_COMMON_DATA, 372 .alt = 0, .oe = 5, .pu = 7, .od = 9, .rt = 11, 373 }; 374 375 /* STiH416 data */ 376 static const unsigned int stih416_delays[] = {0, 300, 500, 750, 1000, 1250, 377 1500, 1750, 2000, 2250, 2500, 2750, 3000, 3250 }; 378 379 static const struct st_pctl_data stih416_data = { 380 .rt_style = st_retime_style_dedicated, 381 .input_delays = stih416_delays, 382 .ninput_delays = ARRAY_SIZE(stih416_delays), 383 .output_delays = stih416_delays, 384 .noutput_delays = ARRAY_SIZE(stih416_delays), 385 .alt = 0, .oe = 40, .pu = 50, .od = 60, .rt = 100, 386 }; 387 388 static const struct st_pctl_data stih407_flashdata = { 389 .rt_style = st_retime_style_none, 390 .input_delays = stih416_delays, 391 .ninput_delays = ARRAY_SIZE(stih416_delays), 392 .output_delays = stih416_delays, 393 .noutput_delays = ARRAY_SIZE(stih416_delays), 394 .alt = 0, 395 .oe = -1, /* Not Available */ 396 .pu = -1, /* Not Available */ 397 .od = 60, 398 .rt = 100, 399 }; 400 401 /* Low level functions.. */ 402 static inline int st_gpio_bank(int gpio) 403 { 404 return gpio/ST_GPIO_PINS_PER_BANK; 405 } 406 407 static inline int st_gpio_pin(int gpio) 408 { 409 return gpio%ST_GPIO_PINS_PER_BANK; 410 } 411 412 static void st_pinconf_set_config(struct st_pio_control *pc, 413 int pin, unsigned long config) 414 { 415 struct regmap_field *output_enable = pc->oe; 416 struct regmap_field *pull_up = pc->pu; 417 struct regmap_field *open_drain = pc->od; 418 unsigned int oe_value, pu_value, od_value; 419 unsigned long mask = BIT(pin); 420 421 if (output_enable) { 422 regmap_field_read(output_enable, &oe_value); 423 oe_value &= ~mask; 424 if (config & ST_PINCONF_OE) 425 oe_value |= mask; 426 regmap_field_write(output_enable, oe_value); 427 } 428 429 if (pull_up) { 430 regmap_field_read(pull_up, &pu_value); 431 pu_value &= ~mask; 432 if (config & ST_PINCONF_PU) 433 pu_value |= mask; 434 regmap_field_write(pull_up, pu_value); 435 } 436 437 if (open_drain) { 438 regmap_field_read(open_drain, &od_value); 439 od_value &= ~mask; 440 if (config & ST_PINCONF_OD) 441 od_value |= mask; 442 regmap_field_write(open_drain, od_value); 443 } 444 } 445 446 static void st_pctl_set_function(struct st_pio_control *pc, 447 int pin_id, int function) 448 { 449 struct regmap_field *alt = pc->alt; 450 unsigned int val; 451 int pin = st_gpio_pin(pin_id); 452 int offset = pin * 4; 453 454 if (!alt) 455 return; 456 457 regmap_field_read(alt, &val); 458 val &= ~(0xf << offset); 459 val |= function << offset; 460 regmap_field_write(alt, val); 461 } 462 463 static unsigned long st_pinconf_delay_to_bit(unsigned int delay, 464 const struct st_pctl_data *data, unsigned long config) 465 { 466 const unsigned int *delay_times; 467 int num_delay_times, i, closest_index = -1; 468 unsigned int closest_divergence = UINT_MAX; 469 470 if (ST_PINCONF_UNPACK_OE(config)) { 471 delay_times = data->output_delays; 472 num_delay_times = data->noutput_delays; 473 } else { 474 delay_times = data->input_delays; 475 num_delay_times = data->ninput_delays; 476 } 477 478 for (i = 0; i < num_delay_times; i++) { 479 unsigned int divergence = abs(delay - delay_times[i]); 480 481 if (divergence == 0) 482 return i; 483 484 if (divergence < closest_divergence) { 485 closest_divergence = divergence; 486 closest_index = i; 487 } 488 } 489 490 pr_warn("Attempt to set delay %d, closest available %d\n", 491 delay, delay_times[closest_index]); 492 493 return closest_index; 494 } 495 496 static unsigned long st_pinconf_bit_to_delay(unsigned int index, 497 const struct st_pctl_data *data, unsigned long output) 498 { 499 const unsigned int *delay_times; 500 int num_delay_times; 501 502 if (output) { 503 delay_times = data->output_delays; 504 num_delay_times = data->noutput_delays; 505 } else { 506 delay_times = data->input_delays; 507 num_delay_times = data->ninput_delays; 508 } 509 510 if (index < num_delay_times) { 511 return delay_times[index]; 512 } else { 513 pr_warn("Delay not found in/out delay list\n"); 514 return 0; 515 } 516 } 517 518 static void st_regmap_field_bit_set_clear_pin(struct regmap_field *field, 519 int enable, int pin) 520 { 521 unsigned int val = 0; 522 523 regmap_field_read(field, &val); 524 if (enable) 525 val |= BIT(pin); 526 else 527 val &= ~BIT(pin); 528 regmap_field_write(field, val); 529 } 530 531 static void st_pinconf_set_retime_packed(struct st_pinctrl *info, 532 struct st_pio_control *pc, unsigned long config, int pin) 533 { 534 const struct st_pctl_data *data = info->data; 535 struct st_retime_packed *rt_p = &pc->rt.rt_p; 536 unsigned int delay; 537 538 st_regmap_field_bit_set_clear_pin(rt_p->clk1notclk0, 539 ST_PINCONF_UNPACK_RT_CLK(config), pin); 540 541 st_regmap_field_bit_set_clear_pin(rt_p->clknotdata, 542 ST_PINCONF_UNPACK_RT_CLKNOTDATA(config), pin); 543 544 st_regmap_field_bit_set_clear_pin(rt_p->double_edge, 545 ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config), pin); 546 547 st_regmap_field_bit_set_clear_pin(rt_p->invertclk, 548 ST_PINCONF_UNPACK_RT_INVERTCLK(config), pin); 549 550 st_regmap_field_bit_set_clear_pin(rt_p->retime, 551 ST_PINCONF_UNPACK_RT(config), pin); 552 553 delay = st_pinconf_delay_to_bit(ST_PINCONF_UNPACK_RT_DELAY(config), 554 data, config); 555 /* 2 bit delay, lsb */ 556 st_regmap_field_bit_set_clear_pin(rt_p->delay_0, delay & 0x1, pin); 557 /* 2 bit delay, msb */ 558 st_regmap_field_bit_set_clear_pin(rt_p->delay_1, delay & 0x2, pin); 559 560 } 561 562 static void st_pinconf_set_retime_dedicated(struct st_pinctrl *info, 563 struct st_pio_control *pc, unsigned long config, int pin) 564 { 565 int input = ST_PINCONF_UNPACK_OE(config) ? 0 : 1; 566 int clk = ST_PINCONF_UNPACK_RT_CLK(config); 567 int clknotdata = ST_PINCONF_UNPACK_RT_CLKNOTDATA(config); 568 int double_edge = ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config); 569 int invertclk = ST_PINCONF_UNPACK_RT_INVERTCLK(config); 570 int retime = ST_PINCONF_UNPACK_RT(config); 571 572 unsigned long delay = st_pinconf_delay_to_bit( 573 ST_PINCONF_UNPACK_RT_DELAY(config), 574 info->data, config); 575 struct st_retime_dedicated *rt_d = &pc->rt.rt_d; 576 577 unsigned long retime_config = 578 ((clk) << RT_D_CFG_CLK_SHIFT) | 579 ((delay) << RT_D_CFG_DELAY_SHIFT) | 580 ((input) << RT_D_CFG_DELAY_INNOTOUT_SHIFT) | 581 ((retime) << RT_D_CFG_RETIME_SHIFT) | 582 ((clknotdata) << RT_D_CFG_CLKNOTDATA_SHIFT) | 583 ((invertclk) << RT_D_CFG_INVERTCLK_SHIFT) | 584 ((double_edge) << RT_D_CFG_DOUBLE_EDGE_SHIFT); 585 586 regmap_field_write(rt_d->rt[pin], retime_config); 587 } 588 589 static void st_pinconf_get_direction(struct st_pio_control *pc, 590 int pin, unsigned long *config) 591 { 592 unsigned int oe_value, pu_value, od_value; 593 594 if (pc->oe) { 595 regmap_field_read(pc->oe, &oe_value); 596 if (oe_value & BIT(pin)) 597 ST_PINCONF_PACK_OE(*config); 598 } 599 600 if (pc->pu) { 601 regmap_field_read(pc->pu, &pu_value); 602 if (pu_value & BIT(pin)) 603 ST_PINCONF_PACK_PU(*config); 604 } 605 606 if (pc->od) { 607 regmap_field_read(pc->od, &od_value); 608 if (od_value & BIT(pin)) 609 ST_PINCONF_PACK_OD(*config); 610 } 611 } 612 613 static int st_pinconf_get_retime_packed(struct st_pinctrl *info, 614 struct st_pio_control *pc, int pin, unsigned long *config) 615 { 616 const struct st_pctl_data *data = info->data; 617 struct st_retime_packed *rt_p = &pc->rt.rt_p; 618 unsigned int delay_bits, delay, delay0, delay1, val; 619 int output = ST_PINCONF_UNPACK_OE(*config); 620 621 if (!regmap_field_read(rt_p->retime, &val) && (val & BIT(pin))) 622 ST_PINCONF_PACK_RT(*config); 623 624 if (!regmap_field_read(rt_p->clk1notclk0, &val) && (val & BIT(pin))) 625 ST_PINCONF_PACK_RT_CLK(*config, 1); 626 627 if (!regmap_field_read(rt_p->clknotdata, &val) && (val & BIT(pin))) 628 ST_PINCONF_PACK_RT_CLKNOTDATA(*config); 629 630 if (!regmap_field_read(rt_p->double_edge, &val) && (val & BIT(pin))) 631 ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config); 632 633 if (!regmap_field_read(rt_p->invertclk, &val) && (val & BIT(pin))) 634 ST_PINCONF_PACK_RT_INVERTCLK(*config); 635 636 regmap_field_read(rt_p->delay_0, &delay0); 637 regmap_field_read(rt_p->delay_1, &delay1); 638 delay_bits = (((delay1 & BIT(pin)) ? 1 : 0) << 1) | 639 (((delay0 & BIT(pin)) ? 1 : 0)); 640 delay = st_pinconf_bit_to_delay(delay_bits, data, output); 641 ST_PINCONF_PACK_RT_DELAY(*config, delay); 642 643 return 0; 644 } 645 646 static int st_pinconf_get_retime_dedicated(struct st_pinctrl *info, 647 struct st_pio_control *pc, int pin, unsigned long *config) 648 { 649 unsigned int value; 650 unsigned long delay_bits, delay, rt_clk; 651 int output = ST_PINCONF_UNPACK_OE(*config); 652 struct st_retime_dedicated *rt_d = &pc->rt.rt_d; 653 654 regmap_field_read(rt_d->rt[pin], &value); 655 656 rt_clk = (value & RT_D_CFG_CLK_MASK) >> RT_D_CFG_CLK_SHIFT; 657 ST_PINCONF_PACK_RT_CLK(*config, rt_clk); 658 659 delay_bits = (value & RT_D_CFG_DELAY_MASK) >> RT_D_CFG_DELAY_SHIFT; 660 delay = st_pinconf_bit_to_delay(delay_bits, info->data, output); 661 ST_PINCONF_PACK_RT_DELAY(*config, delay); 662 663 if (value & RT_D_CFG_CLKNOTDATA_MASK) 664 ST_PINCONF_PACK_RT_CLKNOTDATA(*config); 665 666 if (value & RT_D_CFG_DOUBLE_EDGE_MASK) 667 ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config); 668 669 if (value & RT_D_CFG_INVERTCLK_MASK) 670 ST_PINCONF_PACK_RT_INVERTCLK(*config); 671 672 if (value & RT_D_CFG_RETIME_MASK) 673 ST_PINCONF_PACK_RT(*config); 674 675 return 0; 676 } 677 678 /* GPIO related functions */ 679 680 static inline void __st_gpio_set(struct st_gpio_bank *bank, 681 unsigned offset, int value) 682 { 683 if (value) 684 writel(BIT(offset), bank->base + REG_PIO_SET_POUT); 685 else 686 writel(BIT(offset), bank->base + REG_PIO_CLR_POUT); 687 } 688 689 static void st_gpio_direction(struct st_gpio_bank *bank, 690 unsigned int gpio, unsigned int direction) 691 { 692 int offset = st_gpio_pin(gpio); 693 int i = 0; 694 /** 695 * There are three configuration registers (PIOn_PC0, PIOn_PC1 696 * and PIOn_PC2) for each port. These are used to configure the 697 * PIO port pins. Each pin can be configured as an input, output, 698 * bidirectional, or alternative function pin. Three bits, one bit 699 * from each of the three registers, configure the corresponding bit of 700 * the port. Valid bit settings is: 701 * 702 * PC2 PC1 PC0 Direction. 703 * 0 0 0 [Input Weak pull-up] 704 * 0 0 or 1 1 [Bidirection] 705 * 0 1 0 [Output] 706 * 1 0 0 [Input] 707 * 708 * PIOn_SET_PC and PIOn_CLR_PC registers are used to set and clear bits 709 * individually. 710 */ 711 for (i = 0; i <= 2; i++) { 712 if (direction & BIT(i)) 713 writel(BIT(offset), bank->base + REG_PIO_SET_PC(i)); 714 else 715 writel(BIT(offset), bank->base + REG_PIO_CLR_PC(i)); 716 } 717 } 718 719 static int st_gpio_request(struct gpio_chip *chip, unsigned offset) 720 { 721 return pinctrl_request_gpio(chip->base + offset); 722 } 723 724 static void st_gpio_free(struct gpio_chip *chip, unsigned offset) 725 { 726 pinctrl_free_gpio(chip->base + offset); 727 } 728 729 static int st_gpio_get(struct gpio_chip *chip, unsigned offset) 730 { 731 struct st_gpio_bank *bank = gpio_chip_to_bank(chip); 732 733 return !!(readl(bank->base + REG_PIO_PIN) & BIT(offset)); 734 } 735 736 static void st_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 737 { 738 struct st_gpio_bank *bank = gpio_chip_to_bank(chip); 739 __st_gpio_set(bank, offset, value); 740 } 741 742 static int st_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 743 { 744 pinctrl_gpio_direction_input(chip->base + offset); 745 746 return 0; 747 } 748 749 static int st_gpio_direction_output(struct gpio_chip *chip, 750 unsigned offset, int value) 751 { 752 struct st_gpio_bank *bank = gpio_chip_to_bank(chip); 753 754 __st_gpio_set(bank, offset, value); 755 pinctrl_gpio_direction_output(chip->base + offset); 756 757 return 0; 758 } 759 760 static int st_gpio_xlate(struct gpio_chip *gc, 761 const struct of_phandle_args *gpiospec, u32 *flags) 762 { 763 if (WARN_ON(gc->of_gpio_n_cells < 1)) 764 return -EINVAL; 765 766 if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) 767 return -EINVAL; 768 769 if (gpiospec->args[0] > gc->ngpio) 770 return -EINVAL; 771 772 return gpiospec->args[0]; 773 } 774 775 /* Pinctrl Groups */ 776 static int st_pctl_get_groups_count(struct pinctrl_dev *pctldev) 777 { 778 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 779 780 return info->ngroups; 781 } 782 783 static const char *st_pctl_get_group_name(struct pinctrl_dev *pctldev, 784 unsigned selector) 785 { 786 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 787 788 return info->groups[selector].name; 789 } 790 791 static int st_pctl_get_group_pins(struct pinctrl_dev *pctldev, 792 unsigned selector, const unsigned **pins, unsigned *npins) 793 { 794 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 795 796 if (selector >= info->ngroups) 797 return -EINVAL; 798 799 *pins = info->groups[selector].pins; 800 *npins = info->groups[selector].npins; 801 802 return 0; 803 } 804 805 static const inline struct st_pctl_group *st_pctl_find_group_by_name( 806 const struct st_pinctrl *info, const char *name) 807 { 808 int i; 809 810 for (i = 0; i < info->ngroups; i++) { 811 if (!strcmp(info->groups[i].name, name)) 812 return &info->groups[i]; 813 } 814 815 return NULL; 816 } 817 818 static int st_pctl_dt_node_to_map(struct pinctrl_dev *pctldev, 819 struct device_node *np, struct pinctrl_map **map, unsigned *num_maps) 820 { 821 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 822 const struct st_pctl_group *grp; 823 struct pinctrl_map *new_map; 824 struct device_node *parent; 825 int map_num, i; 826 827 grp = st_pctl_find_group_by_name(info, np->name); 828 if (!grp) { 829 dev_err(info->dev, "unable to find group for node %s\n", 830 np->name); 831 return -EINVAL; 832 } 833 834 map_num = grp->npins + 1; 835 new_map = devm_kzalloc(pctldev->dev, 836 sizeof(*new_map) * map_num, GFP_KERNEL); 837 if (!new_map) 838 return -ENOMEM; 839 840 parent = of_get_parent(np); 841 if (!parent) { 842 devm_kfree(pctldev->dev, new_map); 843 return -EINVAL; 844 } 845 846 *map = new_map; 847 *num_maps = map_num; 848 new_map[0].type = PIN_MAP_TYPE_MUX_GROUP; 849 new_map[0].data.mux.function = parent->name; 850 new_map[0].data.mux.group = np->name; 851 of_node_put(parent); 852 853 /* create config map per pin */ 854 new_map++; 855 for (i = 0; i < grp->npins; i++) { 856 new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN; 857 new_map[i].data.configs.group_or_pin = 858 pin_get_name(pctldev, grp->pins[i]); 859 new_map[i].data.configs.configs = &grp->pin_conf[i].config; 860 new_map[i].data.configs.num_configs = 1; 861 } 862 dev_info(pctldev->dev, "maps: function %s group %s num %d\n", 863 (*map)->data.mux.function, grp->name, map_num); 864 865 return 0; 866 } 867 868 static void st_pctl_dt_free_map(struct pinctrl_dev *pctldev, 869 struct pinctrl_map *map, unsigned num_maps) 870 { 871 } 872 873 static struct pinctrl_ops st_pctlops = { 874 .get_groups_count = st_pctl_get_groups_count, 875 .get_group_pins = st_pctl_get_group_pins, 876 .get_group_name = st_pctl_get_group_name, 877 .dt_node_to_map = st_pctl_dt_node_to_map, 878 .dt_free_map = st_pctl_dt_free_map, 879 }; 880 881 /* Pinmux */ 882 static int st_pmx_get_funcs_count(struct pinctrl_dev *pctldev) 883 { 884 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 885 886 return info->nfunctions; 887 } 888 889 static const char *st_pmx_get_fname(struct pinctrl_dev *pctldev, 890 unsigned selector) 891 { 892 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 893 894 return info->functions[selector].name; 895 } 896 897 static int st_pmx_get_groups(struct pinctrl_dev *pctldev, 898 unsigned selector, const char * const **grps, unsigned * const ngrps) 899 { 900 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 901 *grps = info->functions[selector].groups; 902 *ngrps = info->functions[selector].ngroups; 903 904 return 0; 905 } 906 907 static struct st_pio_control *st_get_pio_control( 908 struct pinctrl_dev *pctldev, int pin) 909 { 910 struct pinctrl_gpio_range *range = 911 pinctrl_find_gpio_range_from_pin(pctldev, pin); 912 struct st_gpio_bank *bank = gpio_range_to_bank(range); 913 914 return &bank->pc; 915 } 916 917 static int st_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned fselector, 918 unsigned group) 919 { 920 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 921 struct st_pinconf *conf = info->groups[group].pin_conf; 922 struct st_pio_control *pc; 923 int i; 924 925 for (i = 0; i < info->groups[group].npins; i++) { 926 pc = st_get_pio_control(pctldev, conf[i].pin); 927 st_pctl_set_function(pc, conf[i].pin, conf[i].altfunc); 928 } 929 930 return 0; 931 } 932 933 static int st_pmx_set_gpio_direction(struct pinctrl_dev *pctldev, 934 struct pinctrl_gpio_range *range, unsigned gpio, 935 bool input) 936 { 937 struct st_gpio_bank *bank = gpio_range_to_bank(range); 938 /* 939 * When a PIO bank is used in its primary function mode (altfunc = 0) 940 * Output Enable (OE), Open Drain(OD), and Pull Up (PU) 941 * for the primary PIO functions are driven by the related PIO block 942 */ 943 st_pctl_set_function(&bank->pc, gpio, 0); 944 st_gpio_direction(bank, gpio, input ? 945 ST_GPIO_DIRECTION_IN : ST_GPIO_DIRECTION_OUT); 946 947 return 0; 948 } 949 950 static struct pinmux_ops st_pmxops = { 951 .get_functions_count = st_pmx_get_funcs_count, 952 .get_function_name = st_pmx_get_fname, 953 .get_function_groups = st_pmx_get_groups, 954 .set_mux = st_pmx_set_mux, 955 .gpio_set_direction = st_pmx_set_gpio_direction, 956 }; 957 958 /* Pinconf */ 959 static void st_pinconf_get_retime(struct st_pinctrl *info, 960 struct st_pio_control *pc, int pin, unsigned long *config) 961 { 962 if (info->data->rt_style == st_retime_style_packed) 963 st_pinconf_get_retime_packed(info, pc, pin, config); 964 else if (info->data->rt_style == st_retime_style_dedicated) 965 if ((BIT(pin) & pc->rt_pin_mask)) 966 st_pinconf_get_retime_dedicated(info, pc, 967 pin, config); 968 } 969 970 static void st_pinconf_set_retime(struct st_pinctrl *info, 971 struct st_pio_control *pc, int pin, unsigned long config) 972 { 973 if (info->data->rt_style == st_retime_style_packed) 974 st_pinconf_set_retime_packed(info, pc, config, pin); 975 else if (info->data->rt_style == st_retime_style_dedicated) 976 if ((BIT(pin) & pc->rt_pin_mask)) 977 st_pinconf_set_retime_dedicated(info, pc, 978 config, pin); 979 } 980 981 static int st_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin_id, 982 unsigned long *configs, unsigned num_configs) 983 { 984 int pin = st_gpio_pin(pin_id); 985 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 986 struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id); 987 int i; 988 989 for (i = 0; i < num_configs; i++) { 990 st_pinconf_set_config(pc, pin, configs[i]); 991 st_pinconf_set_retime(info, pc, pin, configs[i]); 992 } /* for each config */ 993 994 return 0; 995 } 996 997 static int st_pinconf_get(struct pinctrl_dev *pctldev, 998 unsigned pin_id, unsigned long *config) 999 { 1000 int pin = st_gpio_pin(pin_id); 1001 struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 1002 struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id); 1003 1004 *config = 0; 1005 st_pinconf_get_direction(pc, pin, config); 1006 st_pinconf_get_retime(info, pc, pin, config); 1007 1008 return 0; 1009 } 1010 1011 static void st_pinconf_dbg_show(struct pinctrl_dev *pctldev, 1012 struct seq_file *s, unsigned pin_id) 1013 { 1014 unsigned long config; 1015 st_pinconf_get(pctldev, pin_id, &config); 1016 1017 seq_printf(s, "[OE:%ld,PU:%ld,OD:%ld]\n" 1018 "\t\t[retime:%ld,invclk:%ld,clknotdat:%ld," 1019 "de:%ld,rt-clk:%ld,rt-delay:%ld]", 1020 ST_PINCONF_UNPACK_OE(config), 1021 ST_PINCONF_UNPACK_PU(config), 1022 ST_PINCONF_UNPACK_OD(config), 1023 ST_PINCONF_UNPACK_RT(config), 1024 ST_PINCONF_UNPACK_RT_INVERTCLK(config), 1025 ST_PINCONF_UNPACK_RT_CLKNOTDATA(config), 1026 ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config), 1027 ST_PINCONF_UNPACK_RT_CLK(config), 1028 ST_PINCONF_UNPACK_RT_DELAY(config)); 1029 } 1030 1031 static struct pinconf_ops st_confops = { 1032 .pin_config_get = st_pinconf_get, 1033 .pin_config_set = st_pinconf_set, 1034 .pin_config_dbg_show = st_pinconf_dbg_show, 1035 }; 1036 1037 static void st_pctl_dt_child_count(struct st_pinctrl *info, 1038 struct device_node *np) 1039 { 1040 struct device_node *child; 1041 for_each_child_of_node(np, child) { 1042 if (of_property_read_bool(child, "gpio-controller")) { 1043 info->nbanks++; 1044 } else { 1045 info->nfunctions++; 1046 info->ngroups += of_get_child_count(child); 1047 } 1048 } 1049 } 1050 1051 static int st_pctl_dt_setup_retime_packed(struct st_pinctrl *info, 1052 int bank, struct st_pio_control *pc) 1053 { 1054 struct device *dev = info->dev; 1055 struct regmap *rm = info->regmap; 1056 const struct st_pctl_data *data = info->data; 1057 /* 2 registers per bank */ 1058 int reg = (data->rt + bank * RT_P_CFGS_PER_BANK) * 4; 1059 struct st_retime_packed *rt_p = &pc->rt.rt_p; 1060 /* cfg0 */ 1061 struct reg_field clk1notclk0 = RT_P_CFG0_CLK1NOTCLK0_FIELD(reg); 1062 struct reg_field delay_0 = RT_P_CFG0_DELAY_0_FIELD(reg); 1063 struct reg_field delay_1 = RT_P_CFG0_DELAY_1_FIELD(reg); 1064 /* cfg1 */ 1065 struct reg_field invertclk = RT_P_CFG1_INVERTCLK_FIELD(reg + 4); 1066 struct reg_field retime = RT_P_CFG1_RETIME_FIELD(reg + 4); 1067 struct reg_field clknotdata = RT_P_CFG1_CLKNOTDATA_FIELD(reg + 4); 1068 struct reg_field double_edge = RT_P_CFG1_DOUBLE_EDGE_FIELD(reg + 4); 1069 1070 rt_p->clk1notclk0 = devm_regmap_field_alloc(dev, rm, clk1notclk0); 1071 rt_p->delay_0 = devm_regmap_field_alloc(dev, rm, delay_0); 1072 rt_p->delay_1 = devm_regmap_field_alloc(dev, rm, delay_1); 1073 rt_p->invertclk = devm_regmap_field_alloc(dev, rm, invertclk); 1074 rt_p->retime = devm_regmap_field_alloc(dev, rm, retime); 1075 rt_p->clknotdata = devm_regmap_field_alloc(dev, rm, clknotdata); 1076 rt_p->double_edge = devm_regmap_field_alloc(dev, rm, double_edge); 1077 1078 if (IS_ERR(rt_p->clk1notclk0) || IS_ERR(rt_p->delay_0) || 1079 IS_ERR(rt_p->delay_1) || IS_ERR(rt_p->invertclk) || 1080 IS_ERR(rt_p->retime) || IS_ERR(rt_p->clknotdata) || 1081 IS_ERR(rt_p->double_edge)) 1082 return -EINVAL; 1083 1084 return 0; 1085 } 1086 1087 static int st_pctl_dt_setup_retime_dedicated(struct st_pinctrl *info, 1088 int bank, struct st_pio_control *pc) 1089 { 1090 struct device *dev = info->dev; 1091 struct regmap *rm = info->regmap; 1092 const struct st_pctl_data *data = info->data; 1093 /* 8 registers per bank */ 1094 int reg_offset = (data->rt + bank * RT_D_CFGS_PER_BANK) * 4; 1095 struct st_retime_dedicated *rt_d = &pc->rt.rt_d; 1096 unsigned int j; 1097 u32 pin_mask = pc->rt_pin_mask; 1098 1099 for (j = 0; j < RT_D_CFGS_PER_BANK; j++) { 1100 if (BIT(j) & pin_mask) { 1101 struct reg_field reg = REG_FIELD(reg_offset, 0, 31); 1102 rt_d->rt[j] = devm_regmap_field_alloc(dev, rm, reg); 1103 if (IS_ERR(rt_d->rt[j])) 1104 return -EINVAL; 1105 reg_offset += 4; 1106 } 1107 } 1108 return 0; 1109 } 1110 1111 static int st_pctl_dt_setup_retime(struct st_pinctrl *info, 1112 int bank, struct st_pio_control *pc) 1113 { 1114 const struct st_pctl_data *data = info->data; 1115 if (data->rt_style == st_retime_style_packed) 1116 return st_pctl_dt_setup_retime_packed(info, bank, pc); 1117 else if (data->rt_style == st_retime_style_dedicated) 1118 return st_pctl_dt_setup_retime_dedicated(info, bank, pc); 1119 1120 return -EINVAL; 1121 } 1122 1123 1124 static struct regmap_field *st_pc_get_value(struct device *dev, 1125 struct regmap *regmap, int bank, 1126 int data, int lsb, int msb) 1127 { 1128 struct reg_field reg = REG_FIELD((data + bank) * 4, lsb, msb); 1129 1130 if (data < 0) 1131 return NULL; 1132 1133 return devm_regmap_field_alloc(dev, regmap, reg); 1134 } 1135 1136 static void st_parse_syscfgs(struct st_pinctrl *info, int bank, 1137 struct device_node *np) 1138 { 1139 const struct st_pctl_data *data = info->data; 1140 /** 1141 * For a given shared register like OE/PU/OD, there are 8 bits per bank 1142 * 0:7 belongs to bank0, 8:15 belongs to bank1 ... 1143 * So each register is shared across 4 banks. 1144 */ 1145 int lsb = (bank%4) * ST_GPIO_PINS_PER_BANK; 1146 int msb = lsb + ST_GPIO_PINS_PER_BANK - 1; 1147 struct st_pio_control *pc = &info->banks[bank].pc; 1148 struct device *dev = info->dev; 1149 struct regmap *regmap = info->regmap; 1150 1151 pc->alt = st_pc_get_value(dev, regmap, bank, data->alt, 0, 31); 1152 pc->oe = st_pc_get_value(dev, regmap, bank/4, data->oe, lsb, msb); 1153 pc->pu = st_pc_get_value(dev, regmap, bank/4, data->pu, lsb, msb); 1154 pc->od = st_pc_get_value(dev, regmap, bank/4, data->od, lsb, msb); 1155 1156 /* retime avaiable for all pins by default */ 1157 pc->rt_pin_mask = 0xff; 1158 of_property_read_u32(np, "st,retime-pin-mask", &pc->rt_pin_mask); 1159 st_pctl_dt_setup_retime(info, bank, pc); 1160 1161 return; 1162 } 1163 1164 /* 1165 * Each pin is represented in of the below forms. 1166 * <bank offset mux direction rt_type rt_delay rt_clk> 1167 */ 1168 static int st_pctl_dt_parse_groups(struct device_node *np, 1169 struct st_pctl_group *grp, struct st_pinctrl *info, int idx) 1170 { 1171 /* bank pad direction val altfunction */ 1172 const __be32 *list; 1173 struct property *pp; 1174 struct st_pinconf *conf; 1175 struct device_node *pins; 1176 int i = 0, npins = 0, nr_props; 1177 1178 pins = of_get_child_by_name(np, "st,pins"); 1179 if (!pins) 1180 return -ENODATA; 1181 1182 for_each_property_of_node(pins, pp) { 1183 /* Skip those we do not want to proceed */ 1184 if (!strcmp(pp->name, "name")) 1185 continue; 1186 1187 if (pp && (pp->length/sizeof(__be32)) >= OF_GPIO_ARGS_MIN) { 1188 npins++; 1189 } else { 1190 pr_warn("Invalid st,pins in %s node\n", np->name); 1191 return -EINVAL; 1192 } 1193 } 1194 1195 grp->npins = npins; 1196 grp->name = np->name; 1197 grp->pins = devm_kzalloc(info->dev, npins * sizeof(u32), GFP_KERNEL); 1198 grp->pin_conf = devm_kzalloc(info->dev, 1199 npins * sizeof(*conf), GFP_KERNEL); 1200 1201 if (!grp->pins || !grp->pin_conf) 1202 return -ENOMEM; 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 of_node_put(pins); 1236 1237 return 0; 1238 } 1239 1240 static int st_pctl_parse_functions(struct device_node *np, 1241 struct st_pinctrl *info, u32 index, int *grp_index) 1242 { 1243 struct device_node *child; 1244 struct st_pmx_func *func; 1245 struct st_pctl_group *grp; 1246 int ret, i; 1247 1248 func = &info->functions[index]; 1249 func->name = np->name; 1250 func->ngroups = of_get_child_count(np); 1251 if (func->ngroups == 0) { 1252 dev_err(info->dev, "No groups defined\n"); 1253 return -EINVAL; 1254 } 1255 func->groups = devm_kzalloc(info->dev, 1256 func->ngroups * sizeof(char *), GFP_KERNEL); 1257 if (!func->groups) 1258 return -ENOMEM; 1259 1260 i = 0; 1261 for_each_child_of_node(np, child) { 1262 func->groups[i] = child->name; 1263 grp = &info->groups[*grp_index]; 1264 *grp_index += 1; 1265 ret = st_pctl_dt_parse_groups(child, grp, info, i++); 1266 if (ret) 1267 return ret; 1268 } 1269 dev_info(info->dev, "Function[%d\t name:%s,\tgroups:%d]\n", 1270 index, func->name, func->ngroups); 1271 1272 return 0; 1273 } 1274 1275 static void st_gpio_irq_mask(struct irq_data *d) 1276 { 1277 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1278 struct st_gpio_bank *bank = gpio_chip_to_bank(gc); 1279 1280 writel(BIT(d->hwirq), bank->base + REG_PIO_CLR_PMASK); 1281 } 1282 1283 static void st_gpio_irq_unmask(struct irq_data *d) 1284 { 1285 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1286 struct st_gpio_bank *bank = gpio_chip_to_bank(gc); 1287 1288 writel(BIT(d->hwirq), bank->base + REG_PIO_SET_PMASK); 1289 } 1290 1291 static int st_gpio_irq_set_type(struct irq_data *d, unsigned type) 1292 { 1293 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1294 struct st_gpio_bank *bank = gpio_chip_to_bank(gc); 1295 unsigned long flags; 1296 int comp, pin = d->hwirq; 1297 u32 val; 1298 u32 pin_edge_conf = 0; 1299 1300 switch (type) { 1301 case IRQ_TYPE_LEVEL_HIGH: 1302 comp = 0; 1303 break; 1304 case IRQ_TYPE_EDGE_FALLING: 1305 comp = 0; 1306 pin_edge_conf = ST_IRQ_FALLING_EDGE_CONF(pin); 1307 break; 1308 case IRQ_TYPE_LEVEL_LOW: 1309 comp = 1; 1310 break; 1311 case IRQ_TYPE_EDGE_RISING: 1312 comp = 1; 1313 pin_edge_conf = ST_IRQ_RISING_EDGE_CONF(pin); 1314 break; 1315 case IRQ_TYPE_EDGE_BOTH: 1316 comp = st_gpio_get(&bank->gpio_chip, pin); 1317 pin_edge_conf = ST_IRQ_BOTH_EDGE_CONF(pin); 1318 break; 1319 default: 1320 return -EINVAL; 1321 } 1322 1323 spin_lock_irqsave(&bank->lock, flags); 1324 bank->irq_edge_conf &= ~(ST_IRQ_EDGE_MASK << ( 1325 pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN)); 1326 bank->irq_edge_conf |= pin_edge_conf; 1327 spin_unlock_irqrestore(&bank->lock, flags); 1328 1329 val = readl(bank->base + REG_PIO_PCOMP); 1330 val &= ~BIT(pin); 1331 val |= (comp << pin); 1332 writel(val, bank->base + REG_PIO_PCOMP); 1333 1334 return 0; 1335 } 1336 1337 /* 1338 * As edge triggers are not supported at hardware level, it is supported by 1339 * software by exploiting the level trigger support in hardware. 1340 * 1341 * Steps for detection raising edge interrupt in software. 1342 * 1343 * Step 1: CONFIGURE pin to detect level LOW interrupts. 1344 * 1345 * Step 2: DETECT level LOW interrupt and in irqmux/gpio bank interrupt handler, 1346 * if the value of pin is low, then CONFIGURE pin for level HIGH interrupt. 1347 * IGNORE calling the actual interrupt handler for the pin at this stage. 1348 * 1349 * Step 3: DETECT level HIGH interrupt and in irqmux/gpio-bank interrupt handler 1350 * if the value of pin is HIGH, CONFIGURE pin for level LOW interrupt and then 1351 * DISPATCH the interrupt to the interrupt handler of the pin. 1352 * 1353 * step-1 ________ __________ 1354 * | | step - 3 1355 * | | 1356 * step -2 |_____| 1357 * 1358 * falling edge is also detected int the same way. 1359 * 1360 */ 1361 static void __gpio_irq_handler(struct st_gpio_bank *bank) 1362 { 1363 unsigned long port_in, port_mask, port_comp, active_irqs; 1364 unsigned long bank_edge_mask, flags; 1365 int n, val, ecfg; 1366 1367 spin_lock_irqsave(&bank->lock, flags); 1368 bank_edge_mask = bank->irq_edge_conf; 1369 spin_unlock_irqrestore(&bank->lock, flags); 1370 1371 for (;;) { 1372 port_in = readl(bank->base + REG_PIO_PIN); 1373 port_comp = readl(bank->base + REG_PIO_PCOMP); 1374 port_mask = readl(bank->base + REG_PIO_PMASK); 1375 1376 active_irqs = (port_in ^ port_comp) & port_mask; 1377 1378 if (active_irqs == 0) 1379 break; 1380 1381 for_each_set_bit(n, &active_irqs, BITS_PER_LONG) { 1382 /* check if we are detecting fake edges ... */ 1383 ecfg = ST_IRQ_EDGE_CONF(bank_edge_mask, n); 1384 1385 if (ecfg) { 1386 /* edge detection. */ 1387 val = st_gpio_get(&bank->gpio_chip, n); 1388 1389 writel(BIT(n), 1390 val ? bank->base + REG_PIO_SET_PCOMP : 1391 bank->base + REG_PIO_CLR_PCOMP); 1392 1393 if (ecfg != ST_IRQ_EDGE_BOTH && 1394 !((ecfg & ST_IRQ_EDGE_FALLING) ^ val)) 1395 continue; 1396 } 1397 1398 generic_handle_irq(irq_find_mapping(bank->gpio_chip.irqdomain, n)); 1399 } 1400 } 1401 } 1402 1403 static void st_gpio_irq_handler(unsigned irq, struct irq_desc *desc) 1404 { 1405 /* interrupt dedicated per bank */ 1406 struct irq_chip *chip = irq_get_chip(irq); 1407 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 1408 struct st_gpio_bank *bank = gpio_chip_to_bank(gc); 1409 1410 chained_irq_enter(chip, desc); 1411 __gpio_irq_handler(bank); 1412 chained_irq_exit(chip, desc); 1413 } 1414 1415 static void st_gpio_irqmux_handler(unsigned irq, struct irq_desc *desc) 1416 { 1417 struct irq_chip *chip = irq_get_chip(irq); 1418 struct st_pinctrl *info = irq_get_handler_data(irq); 1419 unsigned long status; 1420 int n; 1421 1422 chained_irq_enter(chip, desc); 1423 1424 status = readl(info->irqmux_base); 1425 1426 for_each_set_bit(n, &status, info->nbanks) 1427 __gpio_irq_handler(&info->banks[n]); 1428 1429 chained_irq_exit(chip, desc); 1430 } 1431 1432 static struct gpio_chip st_gpio_template = { 1433 .request = st_gpio_request, 1434 .free = st_gpio_free, 1435 .get = st_gpio_get, 1436 .set = st_gpio_set, 1437 .direction_input = st_gpio_direction_input, 1438 .direction_output = st_gpio_direction_output, 1439 .ngpio = ST_GPIO_PINS_PER_BANK, 1440 .of_gpio_n_cells = 1, 1441 .of_xlate = st_gpio_xlate, 1442 }; 1443 1444 static struct irq_chip st_gpio_irqchip = { 1445 .name = "GPIO", 1446 .irq_mask = st_gpio_irq_mask, 1447 .irq_unmask = st_gpio_irq_unmask, 1448 .irq_set_type = st_gpio_irq_set_type, 1449 .flags = IRQCHIP_SKIP_SET_WAKE, 1450 }; 1451 1452 static int st_gpiolib_register_bank(struct st_pinctrl *info, 1453 int bank_nr, struct device_node *np) 1454 { 1455 struct st_gpio_bank *bank = &info->banks[bank_nr]; 1456 struct pinctrl_gpio_range *range = &bank->range; 1457 struct device *dev = info->dev; 1458 int bank_num = of_alias_get_id(np, "gpio"); 1459 struct resource res, irq_res; 1460 int gpio_irq = 0, err; 1461 1462 if (of_address_to_resource(np, 0, &res)) 1463 return -ENODEV; 1464 1465 bank->base = devm_ioremap_resource(dev, &res); 1466 if (IS_ERR(bank->base)) 1467 return PTR_ERR(bank->base); 1468 1469 bank->gpio_chip = st_gpio_template; 1470 bank->gpio_chip.base = bank_num * ST_GPIO_PINS_PER_BANK; 1471 bank->gpio_chip.ngpio = ST_GPIO_PINS_PER_BANK; 1472 bank->gpio_chip.of_node = np; 1473 bank->gpio_chip.dev = dev; 1474 spin_lock_init(&bank->lock); 1475 1476 of_property_read_string(np, "st,bank-name", &range->name); 1477 bank->gpio_chip.label = range->name; 1478 1479 range->id = bank_num; 1480 range->pin_base = range->base = range->id * ST_GPIO_PINS_PER_BANK; 1481 range->npins = bank->gpio_chip.ngpio; 1482 range->gc = &bank->gpio_chip; 1483 err = gpiochip_add(&bank->gpio_chip); 1484 if (err) { 1485 dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_num); 1486 return err; 1487 } 1488 dev_info(dev, "%s bank added.\n", range->name); 1489 1490 /** 1491 * GPIO bank can have one of the two possible types of 1492 * interrupt-wirings. 1493 * 1494 * First type is via irqmux, single interrupt is used by multiple 1495 * gpio banks. This reduces number of overall interrupts numbers 1496 * required. All these banks belong to a single pincontroller. 1497 * _________ 1498 * | |----> [gpio-bank (n) ] 1499 * | |----> [gpio-bank (n + 1)] 1500 * [irqN]-- | irq-mux |----> [gpio-bank (n + 2)] 1501 * | |----> [gpio-bank (... )] 1502 * |_________|----> [gpio-bank (n + 7)] 1503 * 1504 * Second type has a dedicated interrupt per each gpio bank. 1505 * 1506 * [irqN]----> [gpio-bank (n)] 1507 */ 1508 1509 if (of_irq_to_resource(np, 0, &irq_res)) { 1510 gpio_irq = irq_res.start; 1511 gpiochip_set_chained_irqchip(&bank->gpio_chip, &st_gpio_irqchip, 1512 gpio_irq, st_gpio_irq_handler); 1513 } 1514 1515 if (info->irqmux_base > 0 || gpio_irq > 0) { 1516 err = gpiochip_irqchip_add(&bank->gpio_chip, &st_gpio_irqchip, 1517 0, handle_simple_irq, 1518 IRQ_TYPE_LEVEL_LOW); 1519 if (err) { 1520 gpiochip_remove(&bank->gpio_chip); 1521 dev_info(dev, "could not add irqchip\n"); 1522 return err; 1523 } 1524 } else { 1525 dev_info(dev, "No IRQ support for %s bank\n", np->full_name); 1526 } 1527 1528 return 0; 1529 } 1530 1531 static struct of_device_id st_pctl_of_match[] = { 1532 { .compatible = "st,stih415-sbc-pinctrl", .data = &stih415_sbc_data }, 1533 { .compatible = "st,stih415-rear-pinctrl", .data = &stih415_rear_data }, 1534 { .compatible = "st,stih415-left-pinctrl", .data = &stih415_left_data }, 1535 { .compatible = "st,stih415-right-pinctrl", 1536 .data = &stih415_right_data }, 1537 { .compatible = "st,stih415-front-pinctrl", 1538 .data = &stih415_front_data }, 1539 { .compatible = "st,stih416-sbc-pinctrl", .data = &stih416_data}, 1540 { .compatible = "st,stih416-front-pinctrl", .data = &stih416_data}, 1541 { .compatible = "st,stih416-rear-pinctrl", .data = &stih416_data}, 1542 { .compatible = "st,stih416-fvdp-fe-pinctrl", .data = &stih416_data}, 1543 { .compatible = "st,stih416-fvdp-lite-pinctrl", .data = &stih416_data}, 1544 { .compatible = "st,stih407-sbc-pinctrl", .data = &stih416_data}, 1545 { .compatible = "st,stih407-front-pinctrl", .data = &stih416_data}, 1546 { .compatible = "st,stih407-rear-pinctrl", .data = &stih416_data}, 1547 { .compatible = "st,stih407-flash-pinctrl", .data = &stih407_flashdata}, 1548 { /* sentinel */ } 1549 }; 1550 1551 static int st_pctl_probe_dt(struct platform_device *pdev, 1552 struct pinctrl_desc *pctl_desc, struct st_pinctrl *info) 1553 { 1554 int ret = 0; 1555 int i = 0, j = 0, k = 0, bank; 1556 struct pinctrl_pin_desc *pdesc; 1557 struct device_node *np = pdev->dev.of_node; 1558 struct device_node *child; 1559 int grp_index = 0; 1560 int irq = 0; 1561 struct resource *res; 1562 1563 st_pctl_dt_child_count(info, np); 1564 if (!info->nbanks) { 1565 dev_err(&pdev->dev, "you need atleast one gpio bank\n"); 1566 return -EINVAL; 1567 } 1568 1569 dev_info(&pdev->dev, "nbanks = %d\n", info->nbanks); 1570 dev_info(&pdev->dev, "nfunctions = %d\n", info->nfunctions); 1571 dev_info(&pdev->dev, "ngroups = %d\n", info->ngroups); 1572 1573 info->functions = devm_kzalloc(&pdev->dev, 1574 info->nfunctions * sizeof(*info->functions), GFP_KERNEL); 1575 1576 info->groups = devm_kzalloc(&pdev->dev, 1577 info->ngroups * sizeof(*info->groups) , GFP_KERNEL); 1578 1579 info->banks = devm_kzalloc(&pdev->dev, 1580 info->nbanks * sizeof(*info->banks), GFP_KERNEL); 1581 1582 if (!info->functions || !info->groups || !info->banks) 1583 return -ENOMEM; 1584 1585 info->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); 1586 if (IS_ERR(info->regmap)) { 1587 dev_err(info->dev, "No syscfg phandle specified\n"); 1588 return PTR_ERR(info->regmap); 1589 } 1590 info->data = of_match_node(st_pctl_of_match, np)->data; 1591 1592 irq = platform_get_irq(pdev, 0); 1593 1594 if (irq > 0) { 1595 res = platform_get_resource_byname(pdev, 1596 IORESOURCE_MEM, "irqmux"); 1597 info->irqmux_base = devm_ioremap_resource(&pdev->dev, res); 1598 1599 if (IS_ERR(info->irqmux_base)) 1600 return PTR_ERR(info->irqmux_base); 1601 1602 irq_set_chained_handler(irq, st_gpio_irqmux_handler); 1603 irq_set_handler_data(irq, info); 1604 1605 } 1606 1607 pctl_desc->npins = info->nbanks * ST_GPIO_PINS_PER_BANK; 1608 pdesc = devm_kzalloc(&pdev->dev, 1609 sizeof(*pdesc) * pctl_desc->npins, GFP_KERNEL); 1610 if (!pdesc) 1611 return -ENOMEM; 1612 1613 pctl_desc->pins = pdesc; 1614 1615 bank = 0; 1616 for_each_child_of_node(np, child) { 1617 if (of_property_read_bool(child, "gpio-controller")) { 1618 const char *bank_name = NULL; 1619 ret = st_gpiolib_register_bank(info, bank, child); 1620 if (ret) 1621 return ret; 1622 1623 k = info->banks[bank].range.pin_base; 1624 bank_name = info->banks[bank].range.name; 1625 for (j = 0; j < ST_GPIO_PINS_PER_BANK; j++, k++) { 1626 pdesc->number = k; 1627 pdesc->name = kasprintf(GFP_KERNEL, "%s[%d]", 1628 bank_name, j); 1629 pdesc++; 1630 } 1631 st_parse_syscfgs(info, bank, child); 1632 bank++; 1633 } else { 1634 ret = st_pctl_parse_functions(child, info, 1635 i++, &grp_index); 1636 if (ret) { 1637 dev_err(&pdev->dev, "No functions found.\n"); 1638 return ret; 1639 } 1640 } 1641 } 1642 1643 return 0; 1644 } 1645 1646 static int st_pctl_probe(struct platform_device *pdev) 1647 { 1648 struct st_pinctrl *info; 1649 struct pinctrl_desc *pctl_desc; 1650 int ret, i; 1651 1652 if (!pdev->dev.of_node) { 1653 dev_err(&pdev->dev, "device node not found.\n"); 1654 return -EINVAL; 1655 } 1656 1657 pctl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctl_desc), GFP_KERNEL); 1658 if (!pctl_desc) 1659 return -ENOMEM; 1660 1661 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 1662 if (!info) 1663 return -ENOMEM; 1664 1665 info->dev = &pdev->dev; 1666 platform_set_drvdata(pdev, info); 1667 ret = st_pctl_probe_dt(pdev, pctl_desc, info); 1668 if (ret) 1669 return ret; 1670 1671 pctl_desc->owner = THIS_MODULE; 1672 pctl_desc->pctlops = &st_pctlops; 1673 pctl_desc->pmxops = &st_pmxops; 1674 pctl_desc->confops = &st_confops; 1675 pctl_desc->name = dev_name(&pdev->dev); 1676 1677 info->pctl = pinctrl_register(pctl_desc, &pdev->dev, info); 1678 if (!info->pctl) { 1679 dev_err(&pdev->dev, "Failed pinctrl registration\n"); 1680 return -EINVAL; 1681 } 1682 1683 for (i = 0; i < info->nbanks; i++) 1684 pinctrl_add_gpio_range(info->pctl, &info->banks[i].range); 1685 1686 return 0; 1687 } 1688 1689 static struct platform_driver st_pctl_driver = { 1690 .driver = { 1691 .name = "st-pinctrl", 1692 .owner = THIS_MODULE, 1693 .of_match_table = st_pctl_of_match, 1694 }, 1695 .probe = st_pctl_probe, 1696 }; 1697 1698 static int __init st_pctl_init(void) 1699 { 1700 return platform_driver_register(&st_pctl_driver); 1701 } 1702 arch_initcall(st_pctl_init); 1703