1 /* 2 * Driver for the Axis ARTPEC-6 pin controller 3 * 4 * Author: Chris Paterson <chris.paterson@linux.pieboy.co.uk> 5 * 6 * This file is licensed under the terms of the GNU General Public 7 * License version 2. This program is licensed "as is" without any 8 * warranty of any kind, whether express or implied. 9 */ 10 11 #include <linux/device.h> 12 #include <linux/err.h> 13 #include <linux/init.h> 14 #include <linux/io.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/pinctrl/pinctrl.h> 18 #include <linux/pinctrl/pinconf-generic.h> 19 #include <linux/pinctrl/pinconf.h> 20 #include <linux/pinctrl/pinmux.h> 21 #include <linux/slab.h> 22 #include "core.h" 23 #include "pinconf.h" 24 #include "pinctrl-utils.h" 25 26 #define ARTPEC6_LAST_PIN 97 /* 97 pins in pinmux */ 27 #define ARTPEC6_MAX_MUXABLE 35 /* Last pin with muxable function */ 28 29 /* Pinmux control register bit definitions */ 30 #define ARTPEC6_PINMUX_UDC0_MASK 0x00000001 31 #define ARTPEC6_PINMUX_UDC0_SHIFT 0 32 #define ARTPEC6_PINMUX_UDC1_MASK 0x00000002 33 #define ARTPEC6_PINMUX_UDC1_SHIFT 1 34 #define ARTPEC6_PINMUX_DRV_MASK 0x00000060 35 #define ARTPEC6_PINMUX_DRV_SHIFT 5 36 #define ARTPEC6_PINMUX_SEL_MASK 0x00003000 37 #define ARTPEC6_PINMUX_SEL_SHIFT 12 38 39 /* Pinmux configurations */ 40 #define ARTPEC6_CONFIG_0 0 41 #define ARTPEC6_CONFIG_1 1 42 #define ARTPEC6_CONFIG_2 2 43 #define ARTPEC6_CONFIG_3 3 44 45 /* Pin drive strength options */ 46 #define ARTPEC6_DRIVE_4mA 4 47 #define ARTPEC6_DRIVE_4mA_SET 0 48 #define ARTPEC6_DRIVE_6mA 6 49 #define ARTPEC6_DRIVE_6mA_SET 1 50 #define ARTPEC6_DRIVE_8mA 8 51 #define ARTPEC6_DRIVE_8mA_SET 2 52 #define ARTPEC6_DRIVE_9mA 9 53 #define ARTPEC6_DRIVE_9mA_SET 3 54 55 struct artpec6_pmx { 56 struct device *dev; 57 struct pinctrl_dev *pctl; 58 void __iomem *base; 59 struct pinctrl_pin_desc *pins; 60 unsigned int num_pins; 61 const struct artpec6_pin_group *pin_groups; 62 unsigned int num_pin_groups; 63 const struct artpec6_pmx_func *functions; 64 unsigned int num_functions; 65 }; 66 67 struct artpec6_pin_group { 68 const char *name; 69 const unsigned int *pins; 70 const unsigned int num_pins; 71 unsigned char config; 72 }; 73 74 struct artpec6_pmx_func { 75 const char *name; 76 const char * const *groups; 77 const unsigned int num_groups; 78 }; 79 80 /* pins */ 81 static struct pinctrl_pin_desc artpec6_pins[] = { 82 PINCTRL_PIN(0, "GPIO0"), 83 PINCTRL_PIN(1, "GPIO1"), 84 PINCTRL_PIN(2, "GPIO2"), 85 PINCTRL_PIN(3, "GPIO3"), 86 PINCTRL_PIN(4, "GPIO4"), 87 PINCTRL_PIN(5, "GPIO5"), 88 PINCTRL_PIN(6, "GPIO6"), 89 PINCTRL_PIN(7, "GPIO7"), 90 PINCTRL_PIN(8, "GPIO8"), 91 PINCTRL_PIN(9, "GPIO9"), 92 PINCTRL_PIN(10, "GPIO10"), 93 PINCTRL_PIN(11, "GPIO11"), 94 PINCTRL_PIN(12, "GPIO12"), 95 PINCTRL_PIN(13, "GPIO13"), 96 PINCTRL_PIN(14, "GPIO14"), 97 PINCTRL_PIN(15, "GPIO15"), 98 PINCTRL_PIN(16, "GPIO16"), 99 PINCTRL_PIN(17, "GPIO17"), 100 PINCTRL_PIN(18, "GPIO18"), 101 PINCTRL_PIN(19, "GPIO19"), 102 PINCTRL_PIN(20, "GPIO20"), 103 PINCTRL_PIN(21, "GPIO21"), 104 PINCTRL_PIN(22, "GPIO22"), 105 PINCTRL_PIN(23, "GPIO23"), 106 PINCTRL_PIN(24, "GPIO24"), 107 PINCTRL_PIN(25, "GPIO25"), 108 PINCTRL_PIN(26, "GPIO26"), 109 PINCTRL_PIN(27, "GPIO27"), 110 PINCTRL_PIN(28, "GPIO28"), 111 PINCTRL_PIN(29, "GPIO29"), 112 PINCTRL_PIN(30, "GPIO30"), 113 PINCTRL_PIN(31, "GPIO31"), 114 PINCTRL_PIN(32, "UART3_TXD"), 115 PINCTRL_PIN(33, "UART3_RXD"), 116 PINCTRL_PIN(34, "UART3_RTS"), 117 PINCTRL_PIN(35, "UART3_CTS"), 118 PINCTRL_PIN(36, "NF_ALE"), 119 PINCTRL_PIN(37, "NF_CE0_N"), 120 PINCTRL_PIN(38, "NF_CE1_N"), 121 PINCTRL_PIN(39, "NF_CLE"), 122 PINCTRL_PIN(40, "NF_RE_N"), 123 PINCTRL_PIN(41, "NF_WE_N"), 124 PINCTRL_PIN(42, "NF_WP0_N"), 125 PINCTRL_PIN(43, "NF_WP1_N"), 126 PINCTRL_PIN(44, "NF_IO0"), 127 PINCTRL_PIN(45, "NF_IO1"), 128 PINCTRL_PIN(46, "NF_IO2"), 129 PINCTRL_PIN(47, "NF_IO3"), 130 PINCTRL_PIN(48, "NF_IO4"), 131 PINCTRL_PIN(49, "NF_IO5"), 132 PINCTRL_PIN(50, "NF_IO6"), 133 PINCTRL_PIN(51, "NF_IO7"), 134 PINCTRL_PIN(52, "NF_RB0_N"), 135 PINCTRL_PIN(53, "SDIO0_CLK"), 136 PINCTRL_PIN(54, "SDIO0_CMD"), 137 PINCTRL_PIN(55, "SDIO0_DAT0"), 138 PINCTRL_PIN(56, "SDIO0_DAT1"), 139 PINCTRL_PIN(57, "SDIO0_DAT2"), 140 PINCTRL_PIN(58, "SDIO0_DAT3"), 141 PINCTRL_PIN(59, "SDI0_CD"), 142 PINCTRL_PIN(60, "SDI0_WP"), 143 PINCTRL_PIN(61, "SDIO1_CLK"), 144 PINCTRL_PIN(62, "SDIO1_CMD"), 145 PINCTRL_PIN(63, "SDIO1_DAT0"), 146 PINCTRL_PIN(64, "SDIO1_DAT1"), 147 PINCTRL_PIN(65, "SDIO1_DAT2"), 148 PINCTRL_PIN(66, "SDIO1_DAT3"), 149 PINCTRL_PIN(67, "SDIO1_CD"), 150 PINCTRL_PIN(68, "SDIO1_WP"), 151 PINCTRL_PIN(69, "GBE_REFCLk"), 152 PINCTRL_PIN(70, "GBE_GTX_CLK"), 153 PINCTRL_PIN(71, "GBE_TX_CLK"), 154 PINCTRL_PIN(72, "GBE_TX_EN"), 155 PINCTRL_PIN(73, "GBE_TX_ER"), 156 PINCTRL_PIN(74, "GBE_TXD0"), 157 PINCTRL_PIN(75, "GBE_TXD1"), 158 PINCTRL_PIN(76, "GBE_TXD2"), 159 PINCTRL_PIN(77, "GBE_TXD3"), 160 PINCTRL_PIN(78, "GBE_TXD4"), 161 PINCTRL_PIN(79, "GBE_TXD5"), 162 PINCTRL_PIN(80, "GBE_TXD6"), 163 PINCTRL_PIN(81, "GBE_TXD7"), 164 PINCTRL_PIN(82, "GBE_RX_CLK"), 165 PINCTRL_PIN(83, "GBE_RX_DV"), 166 PINCTRL_PIN(84, "GBE_RX_ER"), 167 PINCTRL_PIN(85, "GBE_RXD0"), 168 PINCTRL_PIN(86, "GBE_RXD1"), 169 PINCTRL_PIN(87, "GBE_RXD2"), 170 PINCTRL_PIN(88, "GBE_RXD3"), 171 PINCTRL_PIN(89, "GBE_RXD4"), 172 PINCTRL_PIN(90, "GBE_RXD5"), 173 PINCTRL_PIN(91, "GBE_RXD6"), 174 PINCTRL_PIN(92, "GBE_RXD7"), 175 PINCTRL_PIN(93, "GBE_CRS"), 176 PINCTRL_PIN(94, "GBE_COL"), 177 PINCTRL_PIN(95, "GBE_MDC"), 178 PINCTRL_PIN(96, "GBE_MDIO"), 179 }; 180 181 static const unsigned int cpuclkout_pins0[] = { 0 }; 182 static const unsigned int udlclkout_pins0[] = { 1 }; 183 static const unsigned int i2c1_pins0[] = { 2, 3 }; 184 static const unsigned int i2c2_pins0[] = { 4, 5 }; 185 static const unsigned int i2c3_pins0[] = { 6, 7 }; 186 static const unsigned int i2s0_pins0[] = { 8, 9, 10, 11 }; 187 static const unsigned int i2s1_pins0[] = { 12, 13, 14, 15 }; 188 static const unsigned int i2srefclk_pins0[] = { 19 }; 189 static const unsigned int spi0_pins0[] = { 12, 13, 14, 15 }; 190 static const unsigned int spi1_pins0[] = { 16, 17, 18, 19 }; 191 static const unsigned int pciedebug_pins0[] = { 12, 13, 14, 15 }; 192 static const unsigned int uart0_pins0[] = { 16, 17, 18, 19, 20, 193 21, 22, 23, 24, 25 }; 194 static const unsigned int uart0_pins1[] = { 20, 21, 22, 23 }; 195 static const unsigned int uart1_pins0[] = { 24, 25, 26, 27 }; 196 static const unsigned int uart2_pins0[] = { 26, 27, 28, 29, 30, 197 31, 32, 33, 34, 35 }; 198 static const unsigned int uart2_pins1[] = { 28, 29, 30, 31 }; 199 static const unsigned int uart3_pins0[] = { 32, 33, 34, 35 }; 200 static const unsigned int uart4_pins0[] = { 20, 21, 22, 23 }; 201 static const unsigned int uart5_pins0[] = { 28, 29, 30, 31 }; 202 static const unsigned int nand_pins0[] = { 36, 37, 38, 39, 40, 41, 203 42, 43, 44, 45, 46, 47, 204 48, 49, 50, 51, 52 }; 205 static const unsigned int sdio0_pins0[] = { 53, 54, 55, 56, 57, 58, 59, 60 }; 206 static const unsigned int sdio1_pins0[] = { 61, 62, 63, 64, 65, 66, 67, 68 }; 207 static const unsigned int ethernet_pins0[] = { 69, 70, 71, 72, 73, 74, 75, 208 76, 77, 78, 79, 80, 81, 82, 209 83, 84, 85, 86, 87, 88, 89, 210 90, 91, 92, 93, 94, 95, 96 }; 211 212 static const struct artpec6_pin_group artpec6_pin_groups[] = { 213 { 214 .name = "cpuclkoutgrp0", 215 .pins = cpuclkout_pins0, 216 .num_pins = ARRAY_SIZE(cpuclkout_pins0), 217 .config = ARTPEC6_CONFIG_1, 218 }, 219 { 220 .name = "udlclkoutgrp0", 221 .pins = udlclkout_pins0, 222 .num_pins = ARRAY_SIZE(udlclkout_pins0), 223 .config = ARTPEC6_CONFIG_1, 224 }, 225 { 226 .name = "i2c1grp0", 227 .pins = i2c1_pins0, 228 .num_pins = ARRAY_SIZE(i2c1_pins0), 229 .config = ARTPEC6_CONFIG_1, 230 }, 231 { 232 .name = "i2c2grp0", 233 .pins = i2c2_pins0, 234 .num_pins = ARRAY_SIZE(i2c2_pins0), 235 .config = ARTPEC6_CONFIG_1, 236 }, 237 { 238 .name = "i2c3grp0", 239 .pins = i2c3_pins0, 240 .num_pins = ARRAY_SIZE(i2c3_pins0), 241 .config = ARTPEC6_CONFIG_1, 242 }, 243 { 244 .name = "i2s0grp0", 245 .pins = i2s0_pins0, 246 .num_pins = ARRAY_SIZE(i2s0_pins0), 247 .config = ARTPEC6_CONFIG_1, 248 }, 249 { 250 .name = "i2s1grp0", 251 .pins = i2s1_pins0, 252 .num_pins = ARRAY_SIZE(i2s1_pins0), 253 .config = ARTPEC6_CONFIG_1, 254 }, 255 { 256 .name = "i2srefclkgrp0", 257 .pins = i2srefclk_pins0, 258 .num_pins = ARRAY_SIZE(i2srefclk_pins0), 259 .config = ARTPEC6_CONFIG_3, 260 }, 261 { 262 .name = "spi0grp0", 263 .pins = spi0_pins0, 264 .num_pins = ARRAY_SIZE(spi0_pins0), 265 .config = ARTPEC6_CONFIG_2, 266 }, 267 { 268 .name = "spi1grp0", 269 .pins = spi1_pins0, 270 .num_pins = ARRAY_SIZE(spi1_pins0), 271 .config = ARTPEC6_CONFIG_2, 272 }, 273 { 274 .name = "pciedebuggrp0", 275 .pins = pciedebug_pins0, 276 .num_pins = ARRAY_SIZE(pciedebug_pins0), 277 .config = ARTPEC6_CONFIG_3, 278 }, 279 { 280 .name = "uart0grp0", 281 .pins = uart0_pins0, 282 .num_pins = ARRAY_SIZE(uart0_pins0), 283 .config = ARTPEC6_CONFIG_1, 284 }, 285 { 286 .name = "uart0grp1", 287 .pins = uart0_pins1, 288 .num_pins = ARRAY_SIZE(uart0_pins1), 289 .config = ARTPEC6_CONFIG_1, 290 }, 291 { 292 .name = "uart1grp0", 293 .pins = uart1_pins0, 294 .num_pins = ARRAY_SIZE(uart1_pins0), 295 .config = ARTPEC6_CONFIG_2, 296 }, 297 { 298 .name = "uart2grp0", 299 .pins = uart2_pins0, 300 .num_pins = ARRAY_SIZE(uart2_pins0), 301 .config = ARTPEC6_CONFIG_1, 302 }, 303 { 304 .name = "uart2grp1", 305 .pins = uart2_pins1, 306 .num_pins = ARRAY_SIZE(uart2_pins1), 307 .config = ARTPEC6_CONFIG_1, 308 }, 309 { 310 .name = "uart3grp0", 311 .pins = uart3_pins0, 312 .num_pins = ARRAY_SIZE(uart3_pins0), 313 .config = ARTPEC6_CONFIG_0, 314 }, 315 { 316 .name = "uart4grp0", 317 .pins = uart4_pins0, 318 .num_pins = ARRAY_SIZE(uart4_pins0), 319 .config = ARTPEC6_CONFIG_2, 320 }, 321 { 322 .name = "uart5grp0", 323 .pins = uart5_pins0, 324 .num_pins = ARRAY_SIZE(uart5_pins0), 325 .config = ARTPEC6_CONFIG_2, 326 }, 327 { 328 .name = "uart5nocts", 329 .pins = uart5_pins0, 330 .num_pins = ARRAY_SIZE(uart5_pins0) - 1, 331 .config = ARTPEC6_CONFIG_2, 332 }, 333 { 334 .name = "nandgrp0", 335 .pins = nand_pins0, 336 .num_pins = ARRAY_SIZE(nand_pins0), 337 .config = ARTPEC6_CONFIG_0, 338 }, 339 { 340 .name = "sdio0grp0", 341 .pins = sdio0_pins0, 342 .num_pins = ARRAY_SIZE(sdio0_pins0), 343 .config = ARTPEC6_CONFIG_0, 344 }, 345 { 346 .name = "sdio1grp0", 347 .pins = sdio1_pins0, 348 .num_pins = ARRAY_SIZE(sdio1_pins0), 349 .config = ARTPEC6_CONFIG_0, 350 }, 351 { 352 .name = "ethernetgrp0", 353 .pins = ethernet_pins0, 354 .num_pins = ARRAY_SIZE(ethernet_pins0), 355 .config = ARTPEC6_CONFIG_0, 356 }, 357 }; 358 359 struct pin_register { 360 unsigned int start; 361 unsigned int end; 362 unsigned int reg_base; 363 }; 364 365 /* 366 * The register map has two holes where the pin number 367 * no longer fits directly with the register offset. 368 * This table allows us to map this easily. 369 */ 370 static const struct pin_register pin_register[] = { 371 { 0, 35, 0x0 }, /* 0x0 - 0x8c */ 372 { 36, 52, 0x100 }, /* 0x100 - 0x140 */ 373 { 53, 96, 0x180 }, /* 0x180 - 0x22c */ 374 }; 375 376 static unsigned int artpec6_pmx_reg_offset(unsigned int pin) 377 { 378 int i; 379 380 for (i = 0; i < ARRAY_SIZE(pin_register); i++) { 381 if (pin <= pin_register[i].end) { 382 return (pin - pin_register[i].start) * 4 + 383 pin_register[i].reg_base; 384 } 385 } 386 /* 387 * Anything we return here is wrong, but we can only 388 * get here if pin is outside registered range. 389 */ 390 pr_err("%s: Impossible pin %d\n", __func__, pin); 391 return 0; 392 } 393 394 static int artpec6_get_groups_count(struct pinctrl_dev *pctldev) 395 { 396 return ARRAY_SIZE(artpec6_pin_groups); 397 } 398 399 static const char *artpec6_get_group_name(struct pinctrl_dev *pctldev, 400 unsigned int group) 401 { 402 return artpec6_pin_groups[group].name; 403 } 404 405 static int artpec6_get_group_pins(struct pinctrl_dev *pctldev, 406 unsigned int group, 407 const unsigned int **pins, 408 unsigned int *num_pins) 409 { 410 *pins = (unsigned int *)artpec6_pin_groups[group].pins; 411 *num_pins = artpec6_pin_groups[group].num_pins; 412 return 0; 413 } 414 415 static int artpec6_pconf_drive_mA_to_field(unsigned int mA) 416 { 417 switch (mA) { 418 case ARTPEC6_DRIVE_4mA: 419 return ARTPEC6_DRIVE_4mA_SET; 420 case ARTPEC6_DRIVE_6mA: 421 return ARTPEC6_DRIVE_6mA_SET; 422 case ARTPEC6_DRIVE_8mA: 423 return ARTPEC6_DRIVE_8mA_SET; 424 case ARTPEC6_DRIVE_9mA: 425 return ARTPEC6_DRIVE_9mA_SET; 426 default: 427 return -EINVAL; 428 } 429 } 430 431 static unsigned int artpec6_pconf_drive_field_to_mA(int field) 432 { 433 switch (field) { 434 case ARTPEC6_DRIVE_4mA_SET: 435 return ARTPEC6_DRIVE_4mA; 436 case ARTPEC6_DRIVE_6mA_SET: 437 return ARTPEC6_DRIVE_6mA; 438 case ARTPEC6_DRIVE_8mA_SET: 439 return ARTPEC6_DRIVE_8mA; 440 case ARTPEC6_DRIVE_9mA_SET: 441 return ARTPEC6_DRIVE_9mA; 442 default: 443 /* Shouldn't happen */ 444 return 0; 445 } 446 } 447 448 static struct pinctrl_ops artpec6_pctrl_ops = { 449 .get_group_pins = artpec6_get_group_pins, 450 .get_groups_count = artpec6_get_groups_count, 451 .get_group_name = artpec6_get_group_name, 452 .dt_node_to_map = pinconf_generic_dt_node_to_map_all, 453 .dt_free_map = pinctrl_utils_free_map, 454 }; 455 456 static const char * const gpiogrps[] = { 457 "cpuclkoutgrp0", "udlclkoutgrp0", "i2c1grp0", "i2c2grp0", 458 "i2c3grp0", "i2s0grp0", "i2s1grp0", "i2srefclkgrp0", 459 "spi0grp0", "spi1grp0", "pciedebuggrp0", "uart0grp0", 460 "uart0grp1", "uart1grp0", "uart2grp0", "uart2grp1", 461 "uart4grp0", "uart5grp0", 462 }; 463 static const char * const cpuclkoutgrps[] = { "cpuclkoutgrp0" }; 464 static const char * const udlclkoutgrps[] = { "udlclkoutgrp0" }; 465 static const char * const i2c1grps[] = { "i2c1grp0" }; 466 static const char * const i2c2grps[] = { "i2c2grp0" }; 467 static const char * const i2c3grps[] = { "i2c3grp0" }; 468 static const char * const i2s0grps[] = { "i2s0grp0" }; 469 static const char * const i2s1grps[] = { "i2s1grp0" }; 470 static const char * const i2srefclkgrps[] = { "i2srefclkgrp0" }; 471 static const char * const spi0grps[] = { "spi0grp0" }; 472 static const char * const spi1grps[] = { "spi1grp0" }; 473 static const char * const pciedebuggrps[] = { "pciedebuggrp0" }; 474 static const char * const uart0grps[] = { "uart0grp0", "uart0grp1" }; 475 static const char * const uart1grps[] = { "uart1grp0" }; 476 static const char * const uart2grps[] = { "uart2grp0", "uart2grp1" }; 477 static const char * const uart3grps[] = { "uart3grp0" }; 478 static const char * const uart4grps[] = { "uart4grp0" }; 479 static const char * const uart5grps[] = { "uart5grp0", "uart5nocts" }; 480 static const char * const nandgrps[] = { "nandgrp0" }; 481 static const char * const sdio0grps[] = { "sdio0grp0" }; 482 static const char * const sdio1grps[] = { "sdio1grp0" }; 483 static const char * const ethernetgrps[] = { "ethernetgrp0" }; 484 485 static const struct artpec6_pmx_func artpec6_pmx_functions[] = { 486 { 487 .name = "gpio", 488 .groups = gpiogrps, 489 .num_groups = ARRAY_SIZE(gpiogrps), 490 }, 491 { 492 .name = "cpuclkout", 493 .groups = cpuclkoutgrps, 494 .num_groups = ARRAY_SIZE(cpuclkoutgrps), 495 }, 496 { 497 .name = "udlclkout", 498 .groups = udlclkoutgrps, 499 .num_groups = ARRAY_SIZE(udlclkoutgrps), 500 }, 501 { 502 .name = "i2c1", 503 .groups = i2c1grps, 504 .num_groups = ARRAY_SIZE(i2c1grps), 505 }, 506 { 507 .name = "i2c2", 508 .groups = i2c2grps, 509 .num_groups = ARRAY_SIZE(i2c2grps), 510 }, 511 { 512 .name = "i2c3", 513 .groups = i2c3grps, 514 .num_groups = ARRAY_SIZE(i2c3grps), 515 }, 516 { 517 .name = "i2s0", 518 .groups = i2s0grps, 519 .num_groups = ARRAY_SIZE(i2s0grps), 520 }, 521 { 522 .name = "i2s1", 523 .groups = i2s1grps, 524 .num_groups = ARRAY_SIZE(i2s1grps), 525 }, 526 { 527 .name = "i2srefclk", 528 .groups = i2srefclkgrps, 529 .num_groups = ARRAY_SIZE(i2srefclkgrps), 530 }, 531 { 532 .name = "spi0", 533 .groups = spi0grps, 534 .num_groups = ARRAY_SIZE(spi0grps), 535 }, 536 { 537 .name = "spi1", 538 .groups = spi1grps, 539 .num_groups = ARRAY_SIZE(spi1grps), 540 }, 541 { 542 .name = "pciedebug", 543 .groups = pciedebuggrps, 544 .num_groups = ARRAY_SIZE(pciedebuggrps), 545 }, 546 { 547 .name = "uart0", 548 .groups = uart0grps, 549 .num_groups = ARRAY_SIZE(uart0grps), 550 }, 551 { 552 .name = "uart1", 553 .groups = uart1grps, 554 .num_groups = ARRAY_SIZE(uart1grps), 555 }, 556 { 557 .name = "uart2", 558 .groups = uart2grps, 559 .num_groups = ARRAY_SIZE(uart2grps), 560 }, 561 { 562 .name = "uart3", 563 .groups = uart3grps, 564 .num_groups = ARRAY_SIZE(uart3grps), 565 }, 566 { 567 .name = "uart4", 568 .groups = uart4grps, 569 .num_groups = ARRAY_SIZE(uart4grps), 570 }, 571 { 572 .name = "uart5", 573 .groups = uart5grps, 574 .num_groups = ARRAY_SIZE(uart5grps), 575 }, 576 { 577 .name = "nand", 578 .groups = nandgrps, 579 .num_groups = ARRAY_SIZE(nandgrps), 580 }, 581 { 582 .name = "sdio0", 583 .groups = sdio0grps, 584 .num_groups = ARRAY_SIZE(sdio0grps), 585 }, 586 { 587 .name = "sdio1", 588 .groups = sdio1grps, 589 .num_groups = ARRAY_SIZE(sdio1grps), 590 }, 591 { 592 .name = "ethernet", 593 .groups = ethernetgrps, 594 .num_groups = ARRAY_SIZE(ethernetgrps), 595 }, 596 }; 597 598 static int artpec6_pmx_get_functions_count(struct pinctrl_dev *pctldev) 599 { 600 return ARRAY_SIZE(artpec6_pmx_functions); 601 } 602 603 static const char *artpec6_pmx_get_fname(struct pinctrl_dev *pctldev, 604 unsigned int function) 605 { 606 return artpec6_pmx_functions[function].name; 607 } 608 609 static int artpec6_pmx_get_fgroups(struct pinctrl_dev *pctldev, 610 unsigned int function, 611 const char * const **groups, 612 unsigned int * const num_groups) 613 { 614 *groups = artpec6_pmx_functions[function].groups; 615 *num_groups = artpec6_pmx_functions[function].num_groups; 616 return 0; 617 } 618 619 static void artpec6_pmx_select_func(struct pinctrl_dev *pctldev, 620 unsigned int function, unsigned int group, 621 bool enable) 622 { 623 unsigned int regval, val; 624 unsigned int reg; 625 int i; 626 struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); 627 628 for (i = 0; i < artpec6_pin_groups[group].num_pins; i++) { 629 /* 630 * Registers for pins above a ARTPEC6_MAX_MUXABLE 631 * do not have a SEL field and are always selected. 632 */ 633 if (artpec6_pin_groups[group].pins[i] > ARTPEC6_MAX_MUXABLE) 634 continue; 635 636 if (!strcmp(artpec6_pmx_get_fname(pctldev, function), "gpio")) { 637 /* GPIO is always config 0 */ 638 val = ARTPEC6_CONFIG_0 << ARTPEC6_PINMUX_SEL_SHIFT; 639 } else { 640 if (enable) 641 val = artpec6_pin_groups[group].config 642 << ARTPEC6_PINMUX_SEL_SHIFT; 643 else 644 val = ARTPEC6_CONFIG_0 645 << ARTPEC6_PINMUX_SEL_SHIFT; 646 } 647 648 reg = artpec6_pmx_reg_offset(artpec6_pin_groups[group].pins[i]); 649 650 regval = readl(pmx->base + reg); 651 regval &= ~ARTPEC6_PINMUX_SEL_MASK; 652 regval |= val; 653 writel(regval, pmx->base + reg); 654 } 655 } 656 657 int artpec6_pmx_enable(struct pinctrl_dev *pctldev, unsigned int function, 658 unsigned int group) 659 { 660 struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); 661 662 dev_dbg(pmx->dev, "enabling %s function for pin group %s\n", 663 artpec6_pmx_get_fname(pctldev, function), 664 artpec6_get_group_name(pctldev, group)); 665 666 artpec6_pmx_select_func(pctldev, function, group, true); 667 668 return 0; 669 } 670 671 void artpec6_pmx_disable(struct pinctrl_dev *pctldev, unsigned int function, 672 unsigned int group) 673 { 674 struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); 675 676 dev_dbg(pmx->dev, "disabling %s function for pin group %s\n", 677 artpec6_pmx_get_fname(pctldev, function), 678 artpec6_get_group_name(pctldev, group)); 679 680 artpec6_pmx_select_func(pctldev, function, group, false); 681 } 682 683 static int artpec6_pmx_request_gpio(struct pinctrl_dev *pctldev, 684 struct pinctrl_gpio_range *range, 685 unsigned int pin) 686 { 687 struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); 688 unsigned int reg = artpec6_pmx_reg_offset(pin); 689 u32 val; 690 691 if (pin >= 32) 692 return -EINVAL; 693 694 val = readl_relaxed(pmx->base + reg); 695 val &= ~ARTPEC6_PINMUX_SEL_MASK; 696 val |= ARTPEC6_CONFIG_0 << ARTPEC6_PINMUX_SEL_SHIFT; 697 writel_relaxed(val, pmx->base + reg); 698 699 return 0; 700 } 701 702 static const struct pinmux_ops artpec6_pmx_ops = { 703 .get_functions_count = artpec6_pmx_get_functions_count, 704 .get_function_name = artpec6_pmx_get_fname, 705 .get_function_groups = artpec6_pmx_get_fgroups, 706 .set_mux = artpec6_pmx_enable, 707 .gpio_request_enable = artpec6_pmx_request_gpio, 708 }; 709 710 static int artpec6_pconf_get(struct pinctrl_dev *pctldev, unsigned int pin, 711 unsigned long *config) 712 { 713 struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); 714 enum pin_config_param param = pinconf_to_config_param(*config); 715 unsigned int regval; 716 717 /* Check for valid pin */ 718 if (pin >= pmx->num_pins) { 719 dev_dbg(pmx->dev, "pinconf is not supported for pin %s\n", 720 pmx->pins[pin].name); 721 return -ENOTSUPP; 722 } 723 724 dev_dbg(pmx->dev, "getting configuration for pin %s\n", 725 pmx->pins[pin].name); 726 727 /* Read pin register values */ 728 regval = readl(pmx->base + artpec6_pmx_reg_offset(pin)); 729 730 /* If valid, get configuration for parameter */ 731 switch (param) { 732 case PIN_CONFIG_BIAS_DISABLE: 733 if (!(regval & ARTPEC6_PINMUX_UDC1_MASK)) 734 return -EINVAL; 735 break; 736 737 case PIN_CONFIG_BIAS_PULL_UP: 738 case PIN_CONFIG_BIAS_PULL_DOWN: 739 if (regval & ARTPEC6_PINMUX_UDC1_MASK) 740 return -EINVAL; 741 742 regval = regval & ARTPEC6_PINMUX_UDC0_MASK; 743 if ((param == PIN_CONFIG_BIAS_PULL_UP && !regval) || 744 (param == PIN_CONFIG_BIAS_PULL_DOWN && regval)) 745 return -EINVAL; 746 break; 747 case PIN_CONFIG_DRIVE_STRENGTH: 748 regval = (regval & ARTPEC6_PINMUX_DRV_MASK) 749 >> ARTPEC6_PINMUX_DRV_SHIFT; 750 regval = artpec6_pconf_drive_field_to_mA(regval); 751 *config = pinconf_to_config_packed(param, regval); 752 break; 753 default: 754 return -ENOTSUPP; 755 } 756 757 return 0; 758 } 759 760 /* 761 * Valid combinations of param and arg: 762 * 763 * param arg 764 * PIN_CONFIG_BIAS_DISABLE: x (disable bias) 765 * PIN_CONFIG_BIAS_PULL_UP: 1 (pull up bias + enable) 766 * PIN_CONFIG_BIAS_PULL_DOWN: 1 (pull down bias + enable) 767 * PIN_CONFIG_DRIVE_STRENGTH: x (4mA, 6mA, 8mA, 9mA) 768 * 769 * All other args are invalid. All other params are not supported. 770 */ 771 static int artpec6_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin, 772 unsigned long *configs, unsigned int num_configs) 773 { 774 struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); 775 enum pin_config_param param; 776 unsigned int arg; 777 unsigned int regval; 778 unsigned int *reg; 779 int i; 780 781 /* Check for valid pin */ 782 if (pin >= pmx->num_pins) { 783 dev_dbg(pmx->dev, "pinconf is not supported for pin %s\n", 784 pmx->pins[pin].name); 785 return -ENOTSUPP; 786 } 787 788 dev_dbg(pmx->dev, "setting configuration for pin %s\n", 789 pmx->pins[pin].name); 790 791 reg = pmx->base + artpec6_pmx_reg_offset(pin); 792 793 /* For each config */ 794 for (i = 0; i < num_configs; i++) { 795 int drive; 796 797 param = pinconf_to_config_param(configs[i]); 798 arg = pinconf_to_config_argument(configs[i]); 799 800 switch (param) { 801 case PIN_CONFIG_BIAS_DISABLE: 802 regval = readl(reg); 803 regval |= (1 << ARTPEC6_PINMUX_UDC1_SHIFT); 804 writel(regval, reg); 805 break; 806 807 case PIN_CONFIG_BIAS_PULL_UP: 808 if (arg != 1) { 809 dev_dbg(pctldev->dev, "%s: arg %u out of range\n", 810 __func__, arg); 811 return -EINVAL; 812 } 813 814 regval = readl(reg); 815 regval |= (arg << ARTPEC6_PINMUX_UDC0_SHIFT); 816 regval &= ~ARTPEC6_PINMUX_UDC1_MASK; /* Enable */ 817 writel(regval, reg); 818 break; 819 820 case PIN_CONFIG_BIAS_PULL_DOWN: 821 if (arg != 1) { 822 dev_dbg(pctldev->dev, "%s: arg %u out of range\n", 823 __func__, arg); 824 return -EINVAL; 825 } 826 827 regval = readl(reg); 828 regval &= ~(arg << ARTPEC6_PINMUX_UDC0_SHIFT); 829 regval &= ~ARTPEC6_PINMUX_UDC1_MASK; /* Enable */ 830 writel(regval, reg); 831 break; 832 833 case PIN_CONFIG_DRIVE_STRENGTH: 834 drive = artpec6_pconf_drive_mA_to_field(arg); 835 if (drive < 0) { 836 dev_dbg(pctldev->dev, "%s: arg %u out of range\n", 837 __func__, arg); 838 return -EINVAL; 839 } 840 841 regval = readl(reg); 842 regval &= ~ARTPEC6_PINMUX_DRV_MASK; 843 regval |= (drive << ARTPEC6_PINMUX_DRV_SHIFT); 844 writel(regval, reg); 845 break; 846 847 default: 848 dev_dbg(pmx->dev, "parameter not supported\n"); 849 return -ENOTSUPP; 850 } 851 } 852 853 return 0; 854 } 855 856 static int artpec6_pconf_group_set(struct pinctrl_dev *pctldev, 857 unsigned int group, unsigned long *configs, 858 unsigned int num_configs) 859 { 860 unsigned int num_pins, current_pin; 861 int ret; 862 863 dev_dbg(pctldev->dev, "setting group %s configuration\n", 864 artpec6_get_group_name(pctldev, group)); 865 866 num_pins = artpec6_pin_groups[group].num_pins; 867 868 for (current_pin = 0; current_pin < num_pins; current_pin++) { 869 ret = artpec6_pconf_set(pctldev, 870 artpec6_pin_groups[group].pins[current_pin], 871 configs, num_configs); 872 873 if (ret < 0) 874 return ret; 875 } 876 877 return 0; 878 } 879 880 static const struct pinconf_ops artpec6_pconf_ops = { 881 .is_generic = true, 882 .pin_config_get = artpec6_pconf_get, 883 .pin_config_set = artpec6_pconf_set, 884 .pin_config_group_set = artpec6_pconf_group_set, 885 }; 886 887 static struct pinctrl_desc artpec6_desc = { 888 .name = "artpec6-pinctrl", 889 .owner = THIS_MODULE, 890 .pins = artpec6_pins, 891 .npins = ARRAY_SIZE(artpec6_pins), 892 .pctlops = &artpec6_pctrl_ops, 893 .pmxops = &artpec6_pmx_ops, 894 .confops = &artpec6_pconf_ops, 895 }; 896 897 /* The reset values say 4mA, but we want 8mA as default. */ 898 static void artpec6_pmx_reset(struct artpec6_pmx *pmx) 899 { 900 void __iomem *base = pmx->base; 901 int i; 902 903 for (i = 0; i < ARTPEC6_LAST_PIN; i++) { 904 u32 val; 905 906 val = readl_relaxed(base + artpec6_pmx_reg_offset(i)); 907 val &= ~ARTPEC6_PINMUX_DRV_MASK; 908 val |= ARTPEC6_DRIVE_8mA_SET << ARTPEC6_PINMUX_DRV_SHIFT; 909 writel_relaxed(val, base + artpec6_pmx_reg_offset(i)); 910 } 911 } 912 913 static int artpec6_pmx_probe(struct platform_device *pdev) 914 { 915 struct artpec6_pmx *pmx; 916 struct resource *res; 917 918 pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL); 919 if (!pmx) 920 return -ENOMEM; 921 922 pmx->dev = &pdev->dev; 923 924 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 925 pmx->base = devm_ioremap_resource(&pdev->dev, res); 926 927 if (IS_ERR(pmx->base)) 928 return PTR_ERR(pmx->base); 929 930 artpec6_pmx_reset(pmx); 931 932 pmx->pins = artpec6_pins; 933 pmx->num_pins = ARRAY_SIZE(artpec6_pins); 934 pmx->functions = artpec6_pmx_functions; 935 pmx->num_functions = ARRAY_SIZE(artpec6_pmx_functions); 936 pmx->pin_groups = artpec6_pin_groups; 937 pmx->num_pin_groups = ARRAY_SIZE(artpec6_pin_groups); 938 pmx->pctl = pinctrl_register(&artpec6_desc, &pdev->dev, pmx); 939 940 if (IS_ERR(pmx->pctl)) { 941 dev_err(&pdev->dev, "could not register pinctrl driver\n"); 942 return PTR_ERR(pmx->pctl); 943 } 944 945 platform_set_drvdata(pdev, pmx); 946 947 dev_info(&pdev->dev, "initialised Axis ARTPEC-6 pinctrl driver\n"); 948 949 return 0; 950 } 951 952 static int artpec6_pmx_remove(struct platform_device *pdev) 953 { 954 struct artpec6_pmx *pmx = platform_get_drvdata(pdev); 955 956 pinctrl_unregister(pmx->pctl); 957 958 return 0; 959 } 960 961 static const struct of_device_id artpec6_pinctrl_match[] = { 962 { .compatible = "axis,artpec6-pinctrl" }, 963 {}, 964 }; 965 966 static struct platform_driver artpec6_pmx_driver = { 967 .driver = { 968 .name = "artpec6-pinctrl", 969 .of_match_table = artpec6_pinctrl_match, 970 }, 971 .probe = artpec6_pmx_probe, 972 .remove = artpec6_pmx_remove, 973 }; 974 975 static int __init artpec6_pmx_init(void) 976 { 977 return platform_driver_register(&artpec6_pmx_driver); 978 } 979 arch_initcall(artpec6_pmx_init); 980