1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Pinctrl / GPIO driver for StarFive JH7100 SoC 4 * 5 * Copyright (C) 2020 Shanghai StarFive Technology Co., Ltd. 6 * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk> 7 */ 8 9 #include <linux/bits.h> 10 #include <linux/clk.h> 11 #include <linux/gpio/driver.h> 12 #include <linux/io.h> 13 #include <linux/mod_devicetable.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/reset.h> 18 #include <linux/seq_file.h> 19 #include <linux/spinlock.h> 20 21 #include <linux/pinctrl/consumer.h> 22 #include <linux/pinctrl/pinconf.h> 23 #include <linux/pinctrl/pinctrl.h> 24 #include <linux/pinctrl/pinmux.h> 25 26 #include <dt-bindings/pinctrl/pinctrl-starfive-jh7100.h> 27 28 #include "../core.h" 29 #include "../pinctrl-utils.h" 30 #include "../pinmux.h" 31 #include "../pinconf.h" 32 33 #define DRIVER_NAME "pinctrl-starfive" 34 35 /* 36 * Refer to Section 12. GPIO Registers in the JH7100 data sheet: 37 * https://github.com/starfive-tech/JH7100_Docs 38 */ 39 #define NR_GPIOS 64 40 41 /* 42 * Global enable for GPIO interrupts. If bit 0 is set to 1 the GPIO interrupts 43 * are enabled. If set to 0 the GPIO interrupts are disabled. 44 */ 45 #define GPIOEN 0x000 46 47 /* 48 * The following 32-bit registers come in pairs, but only the offset of the 49 * first register is defined. The first controls (interrupts for) GPIO 0-31 and 50 * the second GPIO 32-63. 51 */ 52 53 /* 54 * Interrupt Type. If set to 1 the interrupt is edge-triggered. If set to 0 the 55 * interrupt is level-triggered. 56 */ 57 #define GPIOIS 0x010 58 59 /* 60 * Edge-Trigger Interrupt Type. If set to 1 the interrupt gets triggered on 61 * both positive and negative edges. If set to 0 the interrupt is triggered by a 62 * single edge. 63 */ 64 #define GPIOIBE 0x018 65 66 /* 67 * Interrupt Trigger Polarity. If set to 1 the interrupt is triggered on a 68 * rising edge (edge-triggered) or high level (level-triggered). If set to 0 the 69 * interrupt is triggered on a falling edge (edge-triggered) or low level 70 * (level-triggered). 71 */ 72 #define GPIOIEV 0x020 73 74 /* 75 * Interrupt Mask. If set to 1 the interrupt is enabled (unmasked). If set to 0 76 * the interrupt is disabled (masked). Note that the current documentation is 77 * wrong and says the exct opposite of this. 78 */ 79 #define GPIOIE 0x028 80 81 /* 82 * Clear Edge-Triggered Interrupts. Write a 1 to clear the edge-triggered 83 * interrupt. 84 */ 85 #define GPIOIC 0x030 86 87 /* 88 * Edge-Triggered Interrupt Status. A 1 means the configured edge was detected. 89 */ 90 #define GPIORIS 0x038 91 92 /* 93 * Interrupt Status after Masking. A 1 means the configured edge or level was 94 * detected and not masked. 95 */ 96 #define GPIOMIS 0x040 97 98 /* 99 * Data Value. Dynamically reflects the value of the GPIO pin. If 1 the pin is 100 * a digital 1 and if 0 the pin is a digital 0. 101 */ 102 #define GPIODIN 0x048 103 104 /* 105 * From the data sheet section 12.2, there are 64 32-bit output data registers 106 * and 64 output enable registers. Output data and output enable registers for 107 * a given GPIO are contiguous. Eg. GPO0_DOUT_CFG is 0x50 and GPO0_DOEN_CFG is 108 * 0x54 while GPO1_DOUT_CFG is 0x58 and GPO1_DOEN_CFG is 0x5c. The stride 109 * between GPIO registers is effectively 8, thus: GPOn_DOUT_CFG is 0x50 + 8n 110 * and GPOn_DOEN_CFG is 0x54 + 8n. 111 */ 112 #define GPON_DOUT_CFG 0x050 113 #define GPON_DOEN_CFG 0x054 114 115 /* 116 * From Section 12.3, there are 75 input signal configuration registers which 117 * are 4 bytes wide starting with GPI_CPU_JTAG_TCK_CFG at 0x250 and ending with 118 * GPI_USB_OVER_CURRENT_CFG 0x378 119 */ 120 #define GPI_CFG_OFFSET 0x250 121 122 /* 123 * Pad Control Bits. There are 16 pad control bits for each pin located in 103 124 * 32-bit registers controlling PAD_GPIO[0] to PAD_GPIO[63] followed by 125 * PAD_FUNC_SHARE[0] to PAD_FUNC_SHARE[141]. Odd numbered pins use the upper 16 126 * bit of each register. 127 */ 128 #define PAD_SLEW_RATE_MASK GENMASK(11, 9) 129 #define PAD_SLEW_RATE_POS 9 130 #define PAD_BIAS_STRONG_PULL_UP BIT(8) 131 #define PAD_INPUT_ENABLE BIT(7) 132 #define PAD_INPUT_SCHMITT_ENABLE BIT(6) 133 #define PAD_BIAS_DISABLE BIT(5) 134 #define PAD_BIAS_PULL_DOWN BIT(4) 135 #define PAD_BIAS_MASK \ 136 (PAD_BIAS_STRONG_PULL_UP | \ 137 PAD_BIAS_DISABLE | \ 138 PAD_BIAS_PULL_DOWN) 139 #define PAD_DRIVE_STRENGTH_MASK GENMASK(3, 0) 140 #define PAD_DRIVE_STRENGTH_POS 0 141 142 /* 143 * From Section 11, the IO_PADSHARE_SEL register can be programmed to select 144 * one of seven pre-defined multiplexed signal groups on PAD_FUNC_SHARE and 145 * PAD_GPIO pads. This is a global setting. 146 */ 147 #define IO_PADSHARE_SEL 0x1a0 148 149 /* 150 * This just needs to be some number such that when 151 * sfp->gpio.pin_base = PAD_INVALID_GPIO then 152 * starfive_pin_to_gpio(sfp, validpin) is never a valid GPIO number. 153 * That is it should underflow and return something >= NR_GPIOS. 154 */ 155 #define PAD_INVALID_GPIO 0x10000 156 157 /* 158 * The packed pinmux values from the device tree look like this: 159 * 160 * | 31 - 24 | 23 - 16 | 15 - 8 | 7 | 6 | 5 - 0 | 161 * | dout | doen | din | dout rev | doen rev | gpio nr | 162 * 163 * ..but the GPOn_DOUT_CFG and GPOn_DOEN_CFG registers look like this: 164 * 165 * | 31 | 30 - 8 | 7 - 0 | 166 * | dout/doen rev | unused | dout/doen | 167 */ 168 static unsigned int starfive_pinmux_to_gpio(u32 v) 169 { 170 return v & (NR_GPIOS - 1); 171 } 172 173 static u32 starfive_pinmux_to_dout(u32 v) 174 { 175 return ((v & BIT(7)) << (31 - 7)) | ((v >> 24) & GENMASK(7, 0)); 176 } 177 178 static u32 starfive_pinmux_to_doen(u32 v) 179 { 180 return ((v & BIT(6)) << (31 - 6)) | ((v >> 16) & GENMASK(7, 0)); 181 } 182 183 static u32 starfive_pinmux_to_din(u32 v) 184 { 185 return (v >> 8) & GENMASK(7, 0); 186 } 187 188 /* 189 * The maximum GPIO output current depends on the chosen drive strength: 190 * 191 * DS: 0 1 2 3 4 5 6 7 192 * mA: 14.2 21.2 28.2 35.2 42.2 49.1 56.0 62.8 193 * 194 * After rounding that is 7*DS + 14 mA 195 */ 196 static u32 starfive_drive_strength_to_max_mA(u16 ds) 197 { 198 return 7 * ds + 14; 199 } 200 201 static u16 starfive_drive_strength_from_max_mA(u32 i) 202 { 203 return (clamp(i, 14U, 63U) - 14) / 7; 204 } 205 206 struct starfive_pinctrl { 207 struct gpio_chip gc; 208 struct pinctrl_gpio_range gpios; 209 raw_spinlock_t lock; 210 void __iomem *base; 211 void __iomem *padctl; 212 struct pinctrl_dev *pctl; 213 struct mutex mutex; /* serialize adding groups and functions */ 214 }; 215 216 static inline unsigned int starfive_pin_to_gpio(const struct starfive_pinctrl *sfp, 217 unsigned int pin) 218 { 219 return pin - sfp->gpios.pin_base; 220 } 221 222 static inline unsigned int starfive_gpio_to_pin(const struct starfive_pinctrl *sfp, 223 unsigned int gpio) 224 { 225 return sfp->gpios.pin_base + gpio; 226 } 227 228 static struct starfive_pinctrl *starfive_from_irq_data(struct irq_data *d) 229 { 230 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 231 232 return container_of(gc, struct starfive_pinctrl, gc); 233 } 234 235 static struct starfive_pinctrl *starfive_from_irq_desc(struct irq_desc *desc) 236 { 237 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 238 239 return container_of(gc, struct starfive_pinctrl, gc); 240 } 241 242 static const struct pinctrl_pin_desc starfive_pins[] = { 243 PINCTRL_PIN(PAD_GPIO(0), "GPIO[0]"), 244 PINCTRL_PIN(PAD_GPIO(1), "GPIO[1]"), 245 PINCTRL_PIN(PAD_GPIO(2), "GPIO[2]"), 246 PINCTRL_PIN(PAD_GPIO(3), "GPIO[3]"), 247 PINCTRL_PIN(PAD_GPIO(4), "GPIO[4]"), 248 PINCTRL_PIN(PAD_GPIO(5), "GPIO[5]"), 249 PINCTRL_PIN(PAD_GPIO(6), "GPIO[6]"), 250 PINCTRL_PIN(PAD_GPIO(7), "GPIO[7]"), 251 PINCTRL_PIN(PAD_GPIO(8), "GPIO[8]"), 252 PINCTRL_PIN(PAD_GPIO(9), "GPIO[9]"), 253 PINCTRL_PIN(PAD_GPIO(10), "GPIO[10]"), 254 PINCTRL_PIN(PAD_GPIO(11), "GPIO[11]"), 255 PINCTRL_PIN(PAD_GPIO(12), "GPIO[12]"), 256 PINCTRL_PIN(PAD_GPIO(13), "GPIO[13]"), 257 PINCTRL_PIN(PAD_GPIO(14), "GPIO[14]"), 258 PINCTRL_PIN(PAD_GPIO(15), "GPIO[15]"), 259 PINCTRL_PIN(PAD_GPIO(16), "GPIO[16]"), 260 PINCTRL_PIN(PAD_GPIO(17), "GPIO[17]"), 261 PINCTRL_PIN(PAD_GPIO(18), "GPIO[18]"), 262 PINCTRL_PIN(PAD_GPIO(19), "GPIO[19]"), 263 PINCTRL_PIN(PAD_GPIO(20), "GPIO[20]"), 264 PINCTRL_PIN(PAD_GPIO(21), "GPIO[21]"), 265 PINCTRL_PIN(PAD_GPIO(22), "GPIO[22]"), 266 PINCTRL_PIN(PAD_GPIO(23), "GPIO[23]"), 267 PINCTRL_PIN(PAD_GPIO(24), "GPIO[24]"), 268 PINCTRL_PIN(PAD_GPIO(25), "GPIO[25]"), 269 PINCTRL_PIN(PAD_GPIO(26), "GPIO[26]"), 270 PINCTRL_PIN(PAD_GPIO(27), "GPIO[27]"), 271 PINCTRL_PIN(PAD_GPIO(28), "GPIO[28]"), 272 PINCTRL_PIN(PAD_GPIO(29), "GPIO[29]"), 273 PINCTRL_PIN(PAD_GPIO(30), "GPIO[30]"), 274 PINCTRL_PIN(PAD_GPIO(31), "GPIO[31]"), 275 PINCTRL_PIN(PAD_GPIO(32), "GPIO[32]"), 276 PINCTRL_PIN(PAD_GPIO(33), "GPIO[33]"), 277 PINCTRL_PIN(PAD_GPIO(34), "GPIO[34]"), 278 PINCTRL_PIN(PAD_GPIO(35), "GPIO[35]"), 279 PINCTRL_PIN(PAD_GPIO(36), "GPIO[36]"), 280 PINCTRL_PIN(PAD_GPIO(37), "GPIO[37]"), 281 PINCTRL_PIN(PAD_GPIO(38), "GPIO[38]"), 282 PINCTRL_PIN(PAD_GPIO(39), "GPIO[39]"), 283 PINCTRL_PIN(PAD_GPIO(40), "GPIO[40]"), 284 PINCTRL_PIN(PAD_GPIO(41), "GPIO[41]"), 285 PINCTRL_PIN(PAD_GPIO(42), "GPIO[42]"), 286 PINCTRL_PIN(PAD_GPIO(43), "GPIO[43]"), 287 PINCTRL_PIN(PAD_GPIO(44), "GPIO[44]"), 288 PINCTRL_PIN(PAD_GPIO(45), "GPIO[45]"), 289 PINCTRL_PIN(PAD_GPIO(46), "GPIO[46]"), 290 PINCTRL_PIN(PAD_GPIO(47), "GPIO[47]"), 291 PINCTRL_PIN(PAD_GPIO(48), "GPIO[48]"), 292 PINCTRL_PIN(PAD_GPIO(49), "GPIO[49]"), 293 PINCTRL_PIN(PAD_GPIO(50), "GPIO[50]"), 294 PINCTRL_PIN(PAD_GPIO(51), "GPIO[51]"), 295 PINCTRL_PIN(PAD_GPIO(52), "GPIO[52]"), 296 PINCTRL_PIN(PAD_GPIO(53), "GPIO[53]"), 297 PINCTRL_PIN(PAD_GPIO(54), "GPIO[54]"), 298 PINCTRL_PIN(PAD_GPIO(55), "GPIO[55]"), 299 PINCTRL_PIN(PAD_GPIO(56), "GPIO[56]"), 300 PINCTRL_PIN(PAD_GPIO(57), "GPIO[57]"), 301 PINCTRL_PIN(PAD_GPIO(58), "GPIO[58]"), 302 PINCTRL_PIN(PAD_GPIO(59), "GPIO[59]"), 303 PINCTRL_PIN(PAD_GPIO(60), "GPIO[60]"), 304 PINCTRL_PIN(PAD_GPIO(61), "GPIO[61]"), 305 PINCTRL_PIN(PAD_GPIO(62), "GPIO[62]"), 306 PINCTRL_PIN(PAD_GPIO(63), "GPIO[63]"), 307 PINCTRL_PIN(PAD_FUNC_SHARE(0), "FUNC_SHARE[0]"), 308 PINCTRL_PIN(PAD_FUNC_SHARE(1), "FUNC_SHARE[1]"), 309 PINCTRL_PIN(PAD_FUNC_SHARE(2), "FUNC_SHARE[2]"), 310 PINCTRL_PIN(PAD_FUNC_SHARE(3), "FUNC_SHARE[3]"), 311 PINCTRL_PIN(PAD_FUNC_SHARE(4), "FUNC_SHARE[4]"), 312 PINCTRL_PIN(PAD_FUNC_SHARE(5), "FUNC_SHARE[5]"), 313 PINCTRL_PIN(PAD_FUNC_SHARE(6), "FUNC_SHARE[6]"), 314 PINCTRL_PIN(PAD_FUNC_SHARE(7), "FUNC_SHARE[7]"), 315 PINCTRL_PIN(PAD_FUNC_SHARE(8), "FUNC_SHARE[8]"), 316 PINCTRL_PIN(PAD_FUNC_SHARE(9), "FUNC_SHARE[9]"), 317 PINCTRL_PIN(PAD_FUNC_SHARE(10), "FUNC_SHARE[10]"), 318 PINCTRL_PIN(PAD_FUNC_SHARE(11), "FUNC_SHARE[11]"), 319 PINCTRL_PIN(PAD_FUNC_SHARE(12), "FUNC_SHARE[12]"), 320 PINCTRL_PIN(PAD_FUNC_SHARE(13), "FUNC_SHARE[13]"), 321 PINCTRL_PIN(PAD_FUNC_SHARE(14), "FUNC_SHARE[14]"), 322 PINCTRL_PIN(PAD_FUNC_SHARE(15), "FUNC_SHARE[15]"), 323 PINCTRL_PIN(PAD_FUNC_SHARE(16), "FUNC_SHARE[16]"), 324 PINCTRL_PIN(PAD_FUNC_SHARE(17), "FUNC_SHARE[17]"), 325 PINCTRL_PIN(PAD_FUNC_SHARE(18), "FUNC_SHARE[18]"), 326 PINCTRL_PIN(PAD_FUNC_SHARE(19), "FUNC_SHARE[19]"), 327 PINCTRL_PIN(PAD_FUNC_SHARE(20), "FUNC_SHARE[20]"), 328 PINCTRL_PIN(PAD_FUNC_SHARE(21), "FUNC_SHARE[21]"), 329 PINCTRL_PIN(PAD_FUNC_SHARE(22), "FUNC_SHARE[22]"), 330 PINCTRL_PIN(PAD_FUNC_SHARE(23), "FUNC_SHARE[23]"), 331 PINCTRL_PIN(PAD_FUNC_SHARE(24), "FUNC_SHARE[24]"), 332 PINCTRL_PIN(PAD_FUNC_SHARE(25), "FUNC_SHARE[25]"), 333 PINCTRL_PIN(PAD_FUNC_SHARE(26), "FUNC_SHARE[26]"), 334 PINCTRL_PIN(PAD_FUNC_SHARE(27), "FUNC_SHARE[27]"), 335 PINCTRL_PIN(PAD_FUNC_SHARE(28), "FUNC_SHARE[28]"), 336 PINCTRL_PIN(PAD_FUNC_SHARE(29), "FUNC_SHARE[29]"), 337 PINCTRL_PIN(PAD_FUNC_SHARE(30), "FUNC_SHARE[30]"), 338 PINCTRL_PIN(PAD_FUNC_SHARE(31), "FUNC_SHARE[31]"), 339 PINCTRL_PIN(PAD_FUNC_SHARE(32), "FUNC_SHARE[32]"), 340 PINCTRL_PIN(PAD_FUNC_SHARE(33), "FUNC_SHARE[33]"), 341 PINCTRL_PIN(PAD_FUNC_SHARE(34), "FUNC_SHARE[34]"), 342 PINCTRL_PIN(PAD_FUNC_SHARE(35), "FUNC_SHARE[35]"), 343 PINCTRL_PIN(PAD_FUNC_SHARE(36), "FUNC_SHARE[36]"), 344 PINCTRL_PIN(PAD_FUNC_SHARE(37), "FUNC_SHARE[37]"), 345 PINCTRL_PIN(PAD_FUNC_SHARE(38), "FUNC_SHARE[38]"), 346 PINCTRL_PIN(PAD_FUNC_SHARE(39), "FUNC_SHARE[39]"), 347 PINCTRL_PIN(PAD_FUNC_SHARE(40), "FUNC_SHARE[40]"), 348 PINCTRL_PIN(PAD_FUNC_SHARE(41), "FUNC_SHARE[41]"), 349 PINCTRL_PIN(PAD_FUNC_SHARE(42), "FUNC_SHARE[42]"), 350 PINCTRL_PIN(PAD_FUNC_SHARE(43), "FUNC_SHARE[43]"), 351 PINCTRL_PIN(PAD_FUNC_SHARE(44), "FUNC_SHARE[44]"), 352 PINCTRL_PIN(PAD_FUNC_SHARE(45), "FUNC_SHARE[45]"), 353 PINCTRL_PIN(PAD_FUNC_SHARE(46), "FUNC_SHARE[46]"), 354 PINCTRL_PIN(PAD_FUNC_SHARE(47), "FUNC_SHARE[47]"), 355 PINCTRL_PIN(PAD_FUNC_SHARE(48), "FUNC_SHARE[48]"), 356 PINCTRL_PIN(PAD_FUNC_SHARE(49), "FUNC_SHARE[49]"), 357 PINCTRL_PIN(PAD_FUNC_SHARE(50), "FUNC_SHARE[50]"), 358 PINCTRL_PIN(PAD_FUNC_SHARE(51), "FUNC_SHARE[51]"), 359 PINCTRL_PIN(PAD_FUNC_SHARE(52), "FUNC_SHARE[52]"), 360 PINCTRL_PIN(PAD_FUNC_SHARE(53), "FUNC_SHARE[53]"), 361 PINCTRL_PIN(PAD_FUNC_SHARE(54), "FUNC_SHARE[54]"), 362 PINCTRL_PIN(PAD_FUNC_SHARE(55), "FUNC_SHARE[55]"), 363 PINCTRL_PIN(PAD_FUNC_SHARE(56), "FUNC_SHARE[56]"), 364 PINCTRL_PIN(PAD_FUNC_SHARE(57), "FUNC_SHARE[57]"), 365 PINCTRL_PIN(PAD_FUNC_SHARE(58), "FUNC_SHARE[58]"), 366 PINCTRL_PIN(PAD_FUNC_SHARE(59), "FUNC_SHARE[59]"), 367 PINCTRL_PIN(PAD_FUNC_SHARE(60), "FUNC_SHARE[60]"), 368 PINCTRL_PIN(PAD_FUNC_SHARE(61), "FUNC_SHARE[61]"), 369 PINCTRL_PIN(PAD_FUNC_SHARE(62), "FUNC_SHARE[62]"), 370 PINCTRL_PIN(PAD_FUNC_SHARE(63), "FUNC_SHARE[63]"), 371 PINCTRL_PIN(PAD_FUNC_SHARE(64), "FUNC_SHARE[64]"), 372 PINCTRL_PIN(PAD_FUNC_SHARE(65), "FUNC_SHARE[65]"), 373 PINCTRL_PIN(PAD_FUNC_SHARE(66), "FUNC_SHARE[66]"), 374 PINCTRL_PIN(PAD_FUNC_SHARE(67), "FUNC_SHARE[67]"), 375 PINCTRL_PIN(PAD_FUNC_SHARE(68), "FUNC_SHARE[68]"), 376 PINCTRL_PIN(PAD_FUNC_SHARE(69), "FUNC_SHARE[69]"), 377 PINCTRL_PIN(PAD_FUNC_SHARE(70), "FUNC_SHARE[70]"), 378 PINCTRL_PIN(PAD_FUNC_SHARE(71), "FUNC_SHARE[71]"), 379 PINCTRL_PIN(PAD_FUNC_SHARE(72), "FUNC_SHARE[72]"), 380 PINCTRL_PIN(PAD_FUNC_SHARE(73), "FUNC_SHARE[73]"), 381 PINCTRL_PIN(PAD_FUNC_SHARE(74), "FUNC_SHARE[74]"), 382 PINCTRL_PIN(PAD_FUNC_SHARE(75), "FUNC_SHARE[75]"), 383 PINCTRL_PIN(PAD_FUNC_SHARE(76), "FUNC_SHARE[76]"), 384 PINCTRL_PIN(PAD_FUNC_SHARE(77), "FUNC_SHARE[77]"), 385 PINCTRL_PIN(PAD_FUNC_SHARE(78), "FUNC_SHARE[78]"), 386 PINCTRL_PIN(PAD_FUNC_SHARE(79), "FUNC_SHARE[79]"), 387 PINCTRL_PIN(PAD_FUNC_SHARE(80), "FUNC_SHARE[80]"), 388 PINCTRL_PIN(PAD_FUNC_SHARE(81), "FUNC_SHARE[81]"), 389 PINCTRL_PIN(PAD_FUNC_SHARE(82), "FUNC_SHARE[82]"), 390 PINCTRL_PIN(PAD_FUNC_SHARE(83), "FUNC_SHARE[83]"), 391 PINCTRL_PIN(PAD_FUNC_SHARE(84), "FUNC_SHARE[84]"), 392 PINCTRL_PIN(PAD_FUNC_SHARE(85), "FUNC_SHARE[85]"), 393 PINCTRL_PIN(PAD_FUNC_SHARE(86), "FUNC_SHARE[86]"), 394 PINCTRL_PIN(PAD_FUNC_SHARE(87), "FUNC_SHARE[87]"), 395 PINCTRL_PIN(PAD_FUNC_SHARE(88), "FUNC_SHARE[88]"), 396 PINCTRL_PIN(PAD_FUNC_SHARE(89), "FUNC_SHARE[89]"), 397 PINCTRL_PIN(PAD_FUNC_SHARE(90), "FUNC_SHARE[90]"), 398 PINCTRL_PIN(PAD_FUNC_SHARE(91), "FUNC_SHARE[91]"), 399 PINCTRL_PIN(PAD_FUNC_SHARE(92), "FUNC_SHARE[92]"), 400 PINCTRL_PIN(PAD_FUNC_SHARE(93), "FUNC_SHARE[93]"), 401 PINCTRL_PIN(PAD_FUNC_SHARE(94), "FUNC_SHARE[94]"), 402 PINCTRL_PIN(PAD_FUNC_SHARE(95), "FUNC_SHARE[95]"), 403 PINCTRL_PIN(PAD_FUNC_SHARE(96), "FUNC_SHARE[96]"), 404 PINCTRL_PIN(PAD_FUNC_SHARE(97), "FUNC_SHARE[97]"), 405 PINCTRL_PIN(PAD_FUNC_SHARE(98), "FUNC_SHARE[98]"), 406 PINCTRL_PIN(PAD_FUNC_SHARE(99), "FUNC_SHARE[99]"), 407 PINCTRL_PIN(PAD_FUNC_SHARE(100), "FUNC_SHARE[100]"), 408 PINCTRL_PIN(PAD_FUNC_SHARE(101), "FUNC_SHARE[101]"), 409 PINCTRL_PIN(PAD_FUNC_SHARE(102), "FUNC_SHARE[102]"), 410 PINCTRL_PIN(PAD_FUNC_SHARE(103), "FUNC_SHARE[103]"), 411 PINCTRL_PIN(PAD_FUNC_SHARE(104), "FUNC_SHARE[104]"), 412 PINCTRL_PIN(PAD_FUNC_SHARE(105), "FUNC_SHARE[105]"), 413 PINCTRL_PIN(PAD_FUNC_SHARE(106), "FUNC_SHARE[106]"), 414 PINCTRL_PIN(PAD_FUNC_SHARE(107), "FUNC_SHARE[107]"), 415 PINCTRL_PIN(PAD_FUNC_SHARE(108), "FUNC_SHARE[108]"), 416 PINCTRL_PIN(PAD_FUNC_SHARE(109), "FUNC_SHARE[109]"), 417 PINCTRL_PIN(PAD_FUNC_SHARE(110), "FUNC_SHARE[110]"), 418 PINCTRL_PIN(PAD_FUNC_SHARE(111), "FUNC_SHARE[111]"), 419 PINCTRL_PIN(PAD_FUNC_SHARE(112), "FUNC_SHARE[112]"), 420 PINCTRL_PIN(PAD_FUNC_SHARE(113), "FUNC_SHARE[113]"), 421 PINCTRL_PIN(PAD_FUNC_SHARE(114), "FUNC_SHARE[114]"), 422 PINCTRL_PIN(PAD_FUNC_SHARE(115), "FUNC_SHARE[115]"), 423 PINCTRL_PIN(PAD_FUNC_SHARE(116), "FUNC_SHARE[116]"), 424 PINCTRL_PIN(PAD_FUNC_SHARE(117), "FUNC_SHARE[117]"), 425 PINCTRL_PIN(PAD_FUNC_SHARE(118), "FUNC_SHARE[118]"), 426 PINCTRL_PIN(PAD_FUNC_SHARE(119), "FUNC_SHARE[119]"), 427 PINCTRL_PIN(PAD_FUNC_SHARE(120), "FUNC_SHARE[120]"), 428 PINCTRL_PIN(PAD_FUNC_SHARE(121), "FUNC_SHARE[121]"), 429 PINCTRL_PIN(PAD_FUNC_SHARE(122), "FUNC_SHARE[122]"), 430 PINCTRL_PIN(PAD_FUNC_SHARE(123), "FUNC_SHARE[123]"), 431 PINCTRL_PIN(PAD_FUNC_SHARE(124), "FUNC_SHARE[124]"), 432 PINCTRL_PIN(PAD_FUNC_SHARE(125), "FUNC_SHARE[125]"), 433 PINCTRL_PIN(PAD_FUNC_SHARE(126), "FUNC_SHARE[126]"), 434 PINCTRL_PIN(PAD_FUNC_SHARE(127), "FUNC_SHARE[127]"), 435 PINCTRL_PIN(PAD_FUNC_SHARE(128), "FUNC_SHARE[128]"), 436 PINCTRL_PIN(PAD_FUNC_SHARE(129), "FUNC_SHARE[129]"), 437 PINCTRL_PIN(PAD_FUNC_SHARE(130), "FUNC_SHARE[130]"), 438 PINCTRL_PIN(PAD_FUNC_SHARE(131), "FUNC_SHARE[131]"), 439 PINCTRL_PIN(PAD_FUNC_SHARE(132), "FUNC_SHARE[132]"), 440 PINCTRL_PIN(PAD_FUNC_SHARE(133), "FUNC_SHARE[133]"), 441 PINCTRL_PIN(PAD_FUNC_SHARE(134), "FUNC_SHARE[134]"), 442 PINCTRL_PIN(PAD_FUNC_SHARE(135), "FUNC_SHARE[135]"), 443 PINCTRL_PIN(PAD_FUNC_SHARE(136), "FUNC_SHARE[136]"), 444 PINCTRL_PIN(PAD_FUNC_SHARE(137), "FUNC_SHARE[137]"), 445 PINCTRL_PIN(PAD_FUNC_SHARE(138), "FUNC_SHARE[138]"), 446 PINCTRL_PIN(PAD_FUNC_SHARE(139), "FUNC_SHARE[139]"), 447 PINCTRL_PIN(PAD_FUNC_SHARE(140), "FUNC_SHARE[140]"), 448 PINCTRL_PIN(PAD_FUNC_SHARE(141), "FUNC_SHARE[141]"), 449 }; 450 451 #ifdef CONFIG_DEBUG_FS 452 static void starfive_pin_dbg_show(struct pinctrl_dev *pctldev, 453 struct seq_file *s, 454 unsigned int pin) 455 { 456 struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); 457 unsigned int gpio = starfive_pin_to_gpio(sfp, pin); 458 void __iomem *reg; 459 u32 dout, doen; 460 461 if (gpio >= NR_GPIOS) 462 return; 463 464 reg = sfp->base + GPON_DOUT_CFG + 8 * gpio; 465 dout = readl_relaxed(reg + 0x000); 466 doen = readl_relaxed(reg + 0x004); 467 468 seq_printf(s, "dout=%lu%s doen=%lu%s", 469 dout & GENMASK(7, 0), (dout & BIT(31)) ? "r" : "", 470 doen & GENMASK(7, 0), (doen & BIT(31)) ? "r" : ""); 471 } 472 #else 473 #define starfive_pin_dbg_show NULL 474 #endif 475 476 static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev, 477 struct device_node *np, 478 struct pinctrl_map **maps, 479 unsigned int *num_maps) 480 { 481 struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); 482 struct device *dev = sfp->gc.parent; 483 struct device_node *child; 484 struct pinctrl_map *map; 485 const char **pgnames; 486 const char *grpname; 487 u32 *pinmux; 488 int ngroups; 489 int *pins; 490 int nmaps; 491 int ret; 492 493 nmaps = 0; 494 ngroups = 0; 495 for_each_available_child_of_node(np, child) { 496 int npinmux = of_property_count_u32_elems(child, "pinmux"); 497 int npins = of_property_count_u32_elems(child, "pins"); 498 499 if (npinmux > 0 && npins > 0) { 500 dev_err(dev, "invalid pinctrl group %pOFn.%pOFn: both pinmux and pins set\n", 501 np, child); 502 of_node_put(child); 503 return -EINVAL; 504 } 505 if (npinmux == 0 && npins == 0) { 506 dev_err(dev, "invalid pinctrl group %pOFn.%pOFn: neither pinmux nor pins set\n", 507 np, child); 508 of_node_put(child); 509 return -EINVAL; 510 } 511 512 if (npinmux > 0) 513 nmaps += 2; 514 else 515 nmaps += 1; 516 ngroups += 1; 517 } 518 519 pgnames = devm_kcalloc(dev, ngroups, sizeof(*pgnames), GFP_KERNEL); 520 if (!pgnames) 521 return -ENOMEM; 522 523 map = kcalloc(nmaps, sizeof(*map), GFP_KERNEL); 524 if (!map) 525 return -ENOMEM; 526 527 nmaps = 0; 528 ngroups = 0; 529 mutex_lock(&sfp->mutex); 530 for_each_available_child_of_node(np, child) { 531 int npins; 532 int i; 533 534 grpname = devm_kasprintf(dev, GFP_KERNEL, "%pOFn.%pOFn", np, child); 535 if (!grpname) { 536 ret = -ENOMEM; 537 goto put_child; 538 } 539 540 pgnames[ngroups++] = grpname; 541 542 if ((npins = of_property_count_u32_elems(child, "pinmux")) > 0) { 543 pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL); 544 if (!pins) { 545 ret = -ENOMEM; 546 goto put_child; 547 } 548 549 pinmux = devm_kcalloc(dev, npins, sizeof(*pinmux), GFP_KERNEL); 550 if (!pinmux) { 551 ret = -ENOMEM; 552 goto put_child; 553 } 554 555 ret = of_property_read_u32_array(child, "pinmux", pinmux, npins); 556 if (ret) 557 goto put_child; 558 559 for (i = 0; i < npins; i++) { 560 unsigned int gpio = starfive_pinmux_to_gpio(pinmux[i]); 561 562 pins[i] = starfive_gpio_to_pin(sfp, gpio); 563 } 564 565 map[nmaps].type = PIN_MAP_TYPE_MUX_GROUP; 566 map[nmaps].data.mux.function = np->name; 567 map[nmaps].data.mux.group = grpname; 568 nmaps += 1; 569 } else if ((npins = of_property_count_u32_elems(child, "pins")) > 0) { 570 pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL); 571 if (!pins) { 572 ret = -ENOMEM; 573 goto put_child; 574 } 575 576 pinmux = NULL; 577 578 for (i = 0; i < npins; i++) { 579 u32 v; 580 581 ret = of_property_read_u32_index(child, "pins", i, &v); 582 if (ret) 583 goto put_child; 584 pins[i] = v; 585 } 586 } else { 587 ret = -EINVAL; 588 goto put_child; 589 } 590 591 ret = pinctrl_generic_add_group(pctldev, grpname, pins, npins, pinmux); 592 if (ret < 0) { 593 dev_err(dev, "error adding group %s: %d\n", grpname, ret); 594 goto put_child; 595 } 596 597 ret = pinconf_generic_parse_dt_config(child, pctldev, 598 &map[nmaps].data.configs.configs, 599 &map[nmaps].data.configs.num_configs); 600 if (ret) { 601 dev_err(dev, "error parsing pin config of group %s: %d\n", 602 grpname, ret); 603 goto put_child; 604 } 605 606 /* don't create a map if there are no pinconf settings */ 607 if (map[nmaps].data.configs.num_configs == 0) 608 continue; 609 610 map[nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP; 611 map[nmaps].data.configs.group_or_pin = grpname; 612 nmaps += 1; 613 } 614 615 ret = pinmux_generic_add_function(pctldev, np->name, pgnames, ngroups, NULL); 616 if (ret < 0) { 617 dev_err(dev, "error adding function %s: %d\n", np->name, ret); 618 goto free_map; 619 } 620 621 *maps = map; 622 *num_maps = nmaps; 623 mutex_unlock(&sfp->mutex); 624 return 0; 625 626 put_child: 627 of_node_put(child); 628 free_map: 629 pinctrl_utils_free_map(pctldev, map, nmaps); 630 mutex_unlock(&sfp->mutex); 631 return ret; 632 } 633 634 static const struct pinctrl_ops starfive_pinctrl_ops = { 635 .get_groups_count = pinctrl_generic_get_group_count, 636 .get_group_name = pinctrl_generic_get_group_name, 637 .get_group_pins = pinctrl_generic_get_group_pins, 638 .pin_dbg_show = starfive_pin_dbg_show, 639 .dt_node_to_map = starfive_dt_node_to_map, 640 .dt_free_map = pinctrl_utils_free_map, 641 }; 642 643 static int starfive_set_mux(struct pinctrl_dev *pctldev, 644 unsigned int fsel, unsigned int gsel) 645 { 646 struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); 647 struct device *dev = sfp->gc.parent; 648 const struct group_desc *group; 649 const u32 *pinmux; 650 unsigned int i; 651 652 group = pinctrl_generic_get_group(pctldev, gsel); 653 if (!group) 654 return -EINVAL; 655 656 pinmux = group->data; 657 for (i = 0; i < group->grp.npins; i++) { 658 u32 v = pinmux[i]; 659 unsigned int gpio = starfive_pinmux_to_gpio(v); 660 u32 dout = starfive_pinmux_to_dout(v); 661 u32 doen = starfive_pinmux_to_doen(v); 662 u32 din = starfive_pinmux_to_din(v); 663 void __iomem *reg_dout; 664 void __iomem *reg_doen; 665 void __iomem *reg_din; 666 unsigned long flags; 667 668 dev_dbg(dev, "GPIO%u: dout=0x%x doen=0x%x din=0x%x\n", 669 gpio, dout, doen, din); 670 671 reg_dout = sfp->base + GPON_DOUT_CFG + 8 * gpio; 672 reg_doen = sfp->base + GPON_DOEN_CFG + 8 * gpio; 673 if (din != GPI_NONE) 674 reg_din = sfp->base + GPI_CFG_OFFSET + 4 * din; 675 else 676 reg_din = NULL; 677 678 raw_spin_lock_irqsave(&sfp->lock, flags); 679 writel_relaxed(dout, reg_dout); 680 writel_relaxed(doen, reg_doen); 681 if (reg_din) 682 writel_relaxed(gpio + 2, reg_din); 683 raw_spin_unlock_irqrestore(&sfp->lock, flags); 684 } 685 686 return 0; 687 } 688 689 static const struct pinmux_ops starfive_pinmux_ops = { 690 .get_functions_count = pinmux_generic_get_function_count, 691 .get_function_name = pinmux_generic_get_function_name, 692 .get_function_groups = pinmux_generic_get_function_groups, 693 .set_mux = starfive_set_mux, 694 .strict = true, 695 }; 696 697 static u16 starfive_padctl_get(struct starfive_pinctrl *sfp, 698 unsigned int pin) 699 { 700 void __iomem *reg = sfp->padctl + 4 * (pin / 2); 701 int shift = 16 * (pin % 2); 702 703 return readl_relaxed(reg) >> shift; 704 } 705 706 static void starfive_padctl_rmw(struct starfive_pinctrl *sfp, 707 unsigned int pin, 708 u16 _mask, u16 _value) 709 { 710 void __iomem *reg = sfp->padctl + 4 * (pin / 2); 711 int shift = 16 * (pin % 2); 712 u32 mask = (u32)_mask << shift; 713 u32 value = (u32)_value << shift; 714 unsigned long flags; 715 716 dev_dbg(sfp->gc.parent, "padctl_rmw(%u, 0x%03x, 0x%03x)\n", pin, _mask, _value); 717 718 raw_spin_lock_irqsave(&sfp->lock, flags); 719 value |= readl_relaxed(reg) & ~mask; 720 writel_relaxed(value, reg); 721 raw_spin_unlock_irqrestore(&sfp->lock, flags); 722 } 723 724 #define PIN_CONFIG_STARFIVE_STRONG_PULL_UP (PIN_CONFIG_END + 1) 725 726 static const struct pinconf_generic_params starfive_pinconf_custom_params[] = { 727 { "starfive,strong-pull-up", PIN_CONFIG_STARFIVE_STRONG_PULL_UP, 1 }, 728 }; 729 730 #ifdef CONFIG_DEBUG_FS 731 static const struct pin_config_item starfive_pinconf_custom_conf_items[] = { 732 PCONFDUMP(PIN_CONFIG_STARFIVE_STRONG_PULL_UP, "input bias strong pull-up", NULL, false), 733 }; 734 735 static_assert(ARRAY_SIZE(starfive_pinconf_custom_conf_items) == 736 ARRAY_SIZE(starfive_pinconf_custom_params)); 737 #else 738 #define starfive_pinconf_custom_conf_items NULL 739 #endif 740 741 static int starfive_pinconf_get(struct pinctrl_dev *pctldev, 742 unsigned int pin, unsigned long *config) 743 { 744 struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); 745 int param = pinconf_to_config_param(*config); 746 u16 value = starfive_padctl_get(sfp, pin); 747 bool enabled; 748 u32 arg; 749 750 switch (param) { 751 case PIN_CONFIG_BIAS_DISABLE: 752 enabled = value & PAD_BIAS_DISABLE; 753 arg = 0; 754 break; 755 case PIN_CONFIG_BIAS_PULL_DOWN: 756 enabled = value & PAD_BIAS_PULL_DOWN; 757 arg = 1; 758 break; 759 case PIN_CONFIG_BIAS_PULL_UP: 760 enabled = !(value & PAD_BIAS_MASK); 761 arg = 1; 762 break; 763 case PIN_CONFIG_DRIVE_STRENGTH: 764 enabled = value & PAD_DRIVE_STRENGTH_MASK; 765 arg = starfive_drive_strength_to_max_mA(value & PAD_DRIVE_STRENGTH_MASK); 766 break; 767 case PIN_CONFIG_INPUT_ENABLE: 768 enabled = value & PAD_INPUT_ENABLE; 769 arg = enabled; 770 break; 771 case PIN_CONFIG_INPUT_SCHMITT_ENABLE: 772 enabled = value & PAD_INPUT_SCHMITT_ENABLE; 773 arg = enabled; 774 break; 775 case PIN_CONFIG_SLEW_RATE: 776 enabled = value & PAD_SLEW_RATE_MASK; 777 arg = (value & PAD_SLEW_RATE_MASK) >> PAD_SLEW_RATE_POS; 778 break; 779 case PIN_CONFIG_STARFIVE_STRONG_PULL_UP: 780 enabled = value & PAD_BIAS_STRONG_PULL_UP; 781 arg = enabled; 782 break; 783 default: 784 return -ENOTSUPP; 785 } 786 787 *config = pinconf_to_config_packed(param, arg); 788 return enabled ? 0 : -EINVAL; 789 } 790 791 static int starfive_pinconf_group_get(struct pinctrl_dev *pctldev, 792 unsigned int gsel, unsigned long *config) 793 { 794 const struct group_desc *group; 795 796 group = pinctrl_generic_get_group(pctldev, gsel); 797 if (!group) 798 return -EINVAL; 799 800 return starfive_pinconf_get(pctldev, group->grp.pins[0], config); 801 } 802 803 static int starfive_pinconf_group_set(struct pinctrl_dev *pctldev, 804 unsigned int gsel, 805 unsigned long *configs, 806 unsigned int num_configs) 807 { 808 struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); 809 const struct group_desc *group; 810 u16 mask, value; 811 int i; 812 813 group = pinctrl_generic_get_group(pctldev, gsel); 814 if (!group) 815 return -EINVAL; 816 817 mask = 0; 818 value = 0; 819 for (i = 0; i < num_configs; i++) { 820 int param = pinconf_to_config_param(configs[i]); 821 u32 arg = pinconf_to_config_argument(configs[i]); 822 823 switch (param) { 824 case PIN_CONFIG_BIAS_DISABLE: 825 mask |= PAD_BIAS_MASK; 826 value = (value & ~PAD_BIAS_MASK) | PAD_BIAS_DISABLE; 827 break; 828 case PIN_CONFIG_BIAS_PULL_DOWN: 829 if (arg == 0) 830 return -ENOTSUPP; 831 mask |= PAD_BIAS_MASK; 832 value = (value & ~PAD_BIAS_MASK) | PAD_BIAS_PULL_DOWN; 833 break; 834 case PIN_CONFIG_BIAS_PULL_UP: 835 if (arg == 0) 836 return -ENOTSUPP; 837 mask |= PAD_BIAS_MASK; 838 value = value & ~PAD_BIAS_MASK; 839 break; 840 case PIN_CONFIG_DRIVE_STRENGTH: 841 mask |= PAD_DRIVE_STRENGTH_MASK; 842 value = (value & ~PAD_DRIVE_STRENGTH_MASK) | 843 starfive_drive_strength_from_max_mA(arg); 844 break; 845 case PIN_CONFIG_INPUT_ENABLE: 846 mask |= PAD_INPUT_ENABLE; 847 if (arg) 848 value |= PAD_INPUT_ENABLE; 849 else 850 value &= ~PAD_INPUT_ENABLE; 851 break; 852 case PIN_CONFIG_INPUT_SCHMITT_ENABLE: 853 mask |= PAD_INPUT_SCHMITT_ENABLE; 854 if (arg) 855 value |= PAD_INPUT_SCHMITT_ENABLE; 856 else 857 value &= ~PAD_INPUT_SCHMITT_ENABLE; 858 break; 859 case PIN_CONFIG_SLEW_RATE: 860 mask |= PAD_SLEW_RATE_MASK; 861 value = (value & ~PAD_SLEW_RATE_MASK) | 862 ((arg << PAD_SLEW_RATE_POS) & PAD_SLEW_RATE_MASK); 863 break; 864 case PIN_CONFIG_STARFIVE_STRONG_PULL_UP: 865 if (arg) { 866 mask |= PAD_BIAS_MASK; 867 value = (value & ~PAD_BIAS_MASK) | 868 PAD_BIAS_STRONG_PULL_UP; 869 } else { 870 mask |= PAD_BIAS_STRONG_PULL_UP; 871 value = value & ~PAD_BIAS_STRONG_PULL_UP; 872 } 873 break; 874 default: 875 return -ENOTSUPP; 876 } 877 } 878 879 for (i = 0; i < group->grp.npins; i++) 880 starfive_padctl_rmw(sfp, group->grp.pins[i], mask, value); 881 882 return 0; 883 } 884 885 #ifdef CONFIG_DEBUG_FS 886 static void starfive_pinconf_dbg_show(struct pinctrl_dev *pctldev, 887 struct seq_file *s, unsigned int pin) 888 { 889 struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); 890 u16 value = starfive_padctl_get(sfp, pin); 891 892 seq_printf(s, " (0x%03x)", value); 893 } 894 #else 895 #define starfive_pinconf_dbg_show NULL 896 #endif 897 898 static const struct pinconf_ops starfive_pinconf_ops = { 899 .pin_config_get = starfive_pinconf_get, 900 .pin_config_group_get = starfive_pinconf_group_get, 901 .pin_config_group_set = starfive_pinconf_group_set, 902 .pin_config_dbg_show = starfive_pinconf_dbg_show, 903 .is_generic = true, 904 }; 905 906 static struct pinctrl_desc starfive_desc = { 907 .name = DRIVER_NAME, 908 .pins = starfive_pins, 909 .npins = ARRAY_SIZE(starfive_pins), 910 .pctlops = &starfive_pinctrl_ops, 911 .pmxops = &starfive_pinmux_ops, 912 .confops = &starfive_pinconf_ops, 913 .owner = THIS_MODULE, 914 .num_custom_params = ARRAY_SIZE(starfive_pinconf_custom_params), 915 .custom_params = starfive_pinconf_custom_params, 916 .custom_conf_items = starfive_pinconf_custom_conf_items, 917 }; 918 919 static int starfive_gpio_get_direction(struct gpio_chip *gc, unsigned int gpio) 920 { 921 struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc); 922 void __iomem *doen = sfp->base + GPON_DOEN_CFG + 8 * gpio; 923 924 if (readl_relaxed(doen) == GPO_ENABLE) 925 return GPIO_LINE_DIRECTION_OUT; 926 927 return GPIO_LINE_DIRECTION_IN; 928 } 929 930 static int starfive_gpio_direction_input(struct gpio_chip *gc, 931 unsigned int gpio) 932 { 933 struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc); 934 void __iomem *doen = sfp->base + GPON_DOEN_CFG + 8 * gpio; 935 unsigned long flags; 936 937 /* enable input and schmitt trigger */ 938 starfive_padctl_rmw(sfp, starfive_gpio_to_pin(sfp, gpio), 939 PAD_INPUT_ENABLE | PAD_INPUT_SCHMITT_ENABLE, 940 PAD_INPUT_ENABLE | PAD_INPUT_SCHMITT_ENABLE); 941 942 raw_spin_lock_irqsave(&sfp->lock, flags); 943 writel_relaxed(GPO_DISABLE, doen); 944 raw_spin_unlock_irqrestore(&sfp->lock, flags); 945 return 0; 946 } 947 948 static int starfive_gpio_direction_output(struct gpio_chip *gc, 949 unsigned int gpio, int value) 950 { 951 struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc); 952 void __iomem *dout = sfp->base + GPON_DOUT_CFG + 8 * gpio; 953 void __iomem *doen = sfp->base + GPON_DOEN_CFG + 8 * gpio; 954 unsigned long flags; 955 956 raw_spin_lock_irqsave(&sfp->lock, flags); 957 writel_relaxed(value, dout); 958 writel_relaxed(GPO_ENABLE, doen); 959 raw_spin_unlock_irqrestore(&sfp->lock, flags); 960 961 /* disable input, schmitt trigger and bias */ 962 starfive_padctl_rmw(sfp, starfive_gpio_to_pin(sfp, gpio), 963 PAD_BIAS_MASK | PAD_INPUT_ENABLE | PAD_INPUT_SCHMITT_ENABLE, 964 PAD_BIAS_DISABLE); 965 966 return 0; 967 } 968 969 static int starfive_gpio_get(struct gpio_chip *gc, unsigned int gpio) 970 { 971 struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc); 972 void __iomem *din = sfp->base + GPIODIN + 4 * (gpio / 32); 973 974 return !!(readl_relaxed(din) & BIT(gpio % 32)); 975 } 976 977 static void starfive_gpio_set(struct gpio_chip *gc, unsigned int gpio, 978 int value) 979 { 980 struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc); 981 void __iomem *dout = sfp->base + GPON_DOUT_CFG + 8 * gpio; 982 unsigned long flags; 983 984 raw_spin_lock_irqsave(&sfp->lock, flags); 985 writel_relaxed(value, dout); 986 raw_spin_unlock_irqrestore(&sfp->lock, flags); 987 } 988 989 static int starfive_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 990 unsigned long config) 991 { 992 struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc); 993 u32 arg = pinconf_to_config_argument(config); 994 u16 value; 995 u16 mask; 996 997 switch (pinconf_to_config_param(config)) { 998 case PIN_CONFIG_BIAS_DISABLE: 999 mask = PAD_BIAS_MASK; 1000 value = PAD_BIAS_DISABLE; 1001 break; 1002 case PIN_CONFIG_BIAS_PULL_DOWN: 1003 if (arg == 0) 1004 return -ENOTSUPP; 1005 mask = PAD_BIAS_MASK; 1006 value = PAD_BIAS_PULL_DOWN; 1007 break; 1008 case PIN_CONFIG_BIAS_PULL_UP: 1009 if (arg == 0) 1010 return -ENOTSUPP; 1011 mask = PAD_BIAS_MASK; 1012 value = 0; 1013 break; 1014 case PIN_CONFIG_DRIVE_PUSH_PULL: 1015 return 0; 1016 case PIN_CONFIG_INPUT_ENABLE: 1017 mask = PAD_INPUT_ENABLE; 1018 value = arg ? PAD_INPUT_ENABLE : 0; 1019 break; 1020 case PIN_CONFIG_INPUT_SCHMITT_ENABLE: 1021 mask = PAD_INPUT_SCHMITT_ENABLE; 1022 value = arg ? PAD_INPUT_SCHMITT_ENABLE : 0; 1023 break; 1024 default: 1025 return -ENOTSUPP; 1026 } 1027 1028 starfive_padctl_rmw(sfp, starfive_gpio_to_pin(sfp, gpio), mask, value); 1029 return 0; 1030 } 1031 1032 static int starfive_gpio_add_pin_ranges(struct gpio_chip *gc) 1033 { 1034 struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc); 1035 1036 sfp->gpios.name = sfp->gc.label; 1037 sfp->gpios.base = sfp->gc.base; 1038 /* 1039 * sfp->gpios.pin_base depends on the chosen signal group 1040 * and is set in starfive_probe() 1041 */ 1042 sfp->gpios.npins = NR_GPIOS; 1043 sfp->gpios.gc = &sfp->gc; 1044 pinctrl_add_gpio_range(sfp->pctl, &sfp->gpios); 1045 return 0; 1046 } 1047 1048 static void starfive_irq_ack(struct irq_data *d) 1049 { 1050 struct starfive_pinctrl *sfp = starfive_from_irq_data(d); 1051 irq_hw_number_t gpio = irqd_to_hwirq(d); 1052 void __iomem *ic = sfp->base + GPIOIC + 4 * (gpio / 32); 1053 u32 mask = BIT(gpio % 32); 1054 unsigned long flags; 1055 1056 raw_spin_lock_irqsave(&sfp->lock, flags); 1057 writel_relaxed(mask, ic); 1058 raw_spin_unlock_irqrestore(&sfp->lock, flags); 1059 } 1060 1061 static void starfive_irq_mask(struct irq_data *d) 1062 { 1063 struct starfive_pinctrl *sfp = starfive_from_irq_data(d); 1064 irq_hw_number_t gpio = irqd_to_hwirq(d); 1065 void __iomem *ie = sfp->base + GPIOIE + 4 * (gpio / 32); 1066 u32 mask = BIT(gpio % 32); 1067 unsigned long flags; 1068 u32 value; 1069 1070 raw_spin_lock_irqsave(&sfp->lock, flags); 1071 value = readl_relaxed(ie) & ~mask; 1072 writel_relaxed(value, ie); 1073 raw_spin_unlock_irqrestore(&sfp->lock, flags); 1074 1075 gpiochip_disable_irq(&sfp->gc, gpio); 1076 } 1077 1078 static void starfive_irq_mask_ack(struct irq_data *d) 1079 { 1080 struct starfive_pinctrl *sfp = starfive_from_irq_data(d); 1081 irq_hw_number_t gpio = irqd_to_hwirq(d); 1082 void __iomem *ie = sfp->base + GPIOIE + 4 * (gpio / 32); 1083 void __iomem *ic = sfp->base + GPIOIC + 4 * (gpio / 32); 1084 u32 mask = BIT(gpio % 32); 1085 unsigned long flags; 1086 u32 value; 1087 1088 raw_spin_lock_irqsave(&sfp->lock, flags); 1089 value = readl_relaxed(ie) & ~mask; 1090 writel_relaxed(value, ie); 1091 writel_relaxed(mask, ic); 1092 raw_spin_unlock_irqrestore(&sfp->lock, flags); 1093 } 1094 1095 static void starfive_irq_unmask(struct irq_data *d) 1096 { 1097 struct starfive_pinctrl *sfp = starfive_from_irq_data(d); 1098 irq_hw_number_t gpio = irqd_to_hwirq(d); 1099 void __iomem *ie = sfp->base + GPIOIE + 4 * (gpio / 32); 1100 u32 mask = BIT(gpio % 32); 1101 unsigned long flags; 1102 u32 value; 1103 1104 gpiochip_enable_irq(&sfp->gc, gpio); 1105 1106 raw_spin_lock_irqsave(&sfp->lock, flags); 1107 value = readl_relaxed(ie) | mask; 1108 writel_relaxed(value, ie); 1109 raw_spin_unlock_irqrestore(&sfp->lock, flags); 1110 } 1111 1112 static int starfive_irq_set_type(struct irq_data *d, unsigned int trigger) 1113 { 1114 struct starfive_pinctrl *sfp = starfive_from_irq_data(d); 1115 irq_hw_number_t gpio = irqd_to_hwirq(d); 1116 void __iomem *base = sfp->base + 4 * (gpio / 32); 1117 u32 mask = BIT(gpio % 32); 1118 u32 irq_type, edge_both, polarity; 1119 unsigned long flags; 1120 1121 switch (trigger) { 1122 case IRQ_TYPE_EDGE_RISING: 1123 irq_type = mask; /* 1: edge triggered */ 1124 edge_both = 0; /* 0: single edge */ 1125 polarity = mask; /* 1: rising edge */ 1126 break; 1127 case IRQ_TYPE_EDGE_FALLING: 1128 irq_type = mask; /* 1: edge triggered */ 1129 edge_both = 0; /* 0: single edge */ 1130 polarity = 0; /* 0: falling edge */ 1131 break; 1132 case IRQ_TYPE_EDGE_BOTH: 1133 irq_type = mask; /* 1: edge triggered */ 1134 edge_both = mask; /* 1: both edges */ 1135 polarity = 0; /* 0: ignored */ 1136 break; 1137 case IRQ_TYPE_LEVEL_HIGH: 1138 irq_type = 0; /* 0: level triggered */ 1139 edge_both = 0; /* 0: ignored */ 1140 polarity = mask; /* 1: high level */ 1141 break; 1142 case IRQ_TYPE_LEVEL_LOW: 1143 irq_type = 0; /* 0: level triggered */ 1144 edge_both = 0; /* 0: ignored */ 1145 polarity = 0; /* 0: low level */ 1146 break; 1147 default: 1148 return -EINVAL; 1149 } 1150 1151 if (trigger & IRQ_TYPE_EDGE_BOTH) 1152 irq_set_handler_locked(d, handle_edge_irq); 1153 else 1154 irq_set_handler_locked(d, handle_level_irq); 1155 1156 raw_spin_lock_irqsave(&sfp->lock, flags); 1157 irq_type |= readl_relaxed(base + GPIOIS) & ~mask; 1158 writel_relaxed(irq_type, base + GPIOIS); 1159 edge_both |= readl_relaxed(base + GPIOIBE) & ~mask; 1160 writel_relaxed(edge_both, base + GPIOIBE); 1161 polarity |= readl_relaxed(base + GPIOIEV) & ~mask; 1162 writel_relaxed(polarity, base + GPIOIEV); 1163 raw_spin_unlock_irqrestore(&sfp->lock, flags); 1164 return 0; 1165 } 1166 1167 static const struct irq_chip starfive_irq_chip = { 1168 .name = "StarFive GPIO", 1169 .irq_ack = starfive_irq_ack, 1170 .irq_mask = starfive_irq_mask, 1171 .irq_mask_ack = starfive_irq_mask_ack, 1172 .irq_unmask = starfive_irq_unmask, 1173 .irq_set_type = starfive_irq_set_type, 1174 .flags = IRQCHIP_IMMUTABLE | IRQCHIP_SET_TYPE_MASKED, 1175 GPIOCHIP_IRQ_RESOURCE_HELPERS, 1176 }; 1177 1178 static void starfive_gpio_irq_handler(struct irq_desc *desc) 1179 { 1180 struct starfive_pinctrl *sfp = starfive_from_irq_desc(desc); 1181 struct irq_chip *chip = irq_desc_get_chip(desc); 1182 unsigned long mis; 1183 unsigned int pin; 1184 1185 chained_irq_enter(chip, desc); 1186 1187 mis = readl_relaxed(sfp->base + GPIOMIS + 0); 1188 for_each_set_bit(pin, &mis, 32) 1189 generic_handle_domain_irq(sfp->gc.irq.domain, pin); 1190 1191 mis = readl_relaxed(sfp->base + GPIOMIS + 4); 1192 for_each_set_bit(pin, &mis, 32) 1193 generic_handle_domain_irq(sfp->gc.irq.domain, pin + 32); 1194 1195 chained_irq_exit(chip, desc); 1196 } 1197 1198 static int starfive_gpio_init_hw(struct gpio_chip *gc) 1199 { 1200 struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc); 1201 1202 /* mask all GPIO interrupts */ 1203 writel(0, sfp->base + GPIOIE + 0); 1204 writel(0, sfp->base + GPIOIE + 4); 1205 /* clear edge interrupt flags */ 1206 writel(~0U, sfp->base + GPIOIC + 0); 1207 writel(~0U, sfp->base + GPIOIC + 4); 1208 /* enable GPIO interrupts */ 1209 writel(1, sfp->base + GPIOEN); 1210 return 0; 1211 } 1212 1213 static void starfive_disable_clock(void *data) 1214 { 1215 clk_disable_unprepare(data); 1216 } 1217 1218 static int starfive_probe(struct platform_device *pdev) 1219 { 1220 struct device *dev = &pdev->dev; 1221 struct starfive_pinctrl *sfp; 1222 struct reset_control *rst; 1223 struct clk *clk; 1224 u32 value; 1225 int ret; 1226 1227 sfp = devm_kzalloc(dev, sizeof(*sfp), GFP_KERNEL); 1228 if (!sfp) 1229 return -ENOMEM; 1230 1231 sfp->base = devm_platform_ioremap_resource_byname(pdev, "gpio"); 1232 if (IS_ERR(sfp->base)) 1233 return PTR_ERR(sfp->base); 1234 1235 sfp->padctl = devm_platform_ioremap_resource_byname(pdev, "padctl"); 1236 if (IS_ERR(sfp->padctl)) 1237 return PTR_ERR(sfp->padctl); 1238 1239 clk = devm_clk_get(dev, NULL); 1240 if (IS_ERR(clk)) 1241 return dev_err_probe(dev, PTR_ERR(clk), "could not get clock\n"); 1242 1243 rst = devm_reset_control_get_exclusive(dev, NULL); 1244 if (IS_ERR(rst)) 1245 return dev_err_probe(dev, PTR_ERR(rst), "could not get reset\n"); 1246 1247 ret = clk_prepare_enable(clk); 1248 if (ret) 1249 return dev_err_probe(dev, ret, "could not enable clock\n"); 1250 1251 ret = devm_add_action_or_reset(dev, starfive_disable_clock, clk); 1252 if (ret) 1253 return ret; 1254 1255 /* 1256 * We don't want to assert reset and risk undoing pin muxing for the 1257 * early boot serial console, but let's make sure the reset line is 1258 * deasserted in case someone runs a really minimal bootloader. 1259 */ 1260 ret = reset_control_deassert(rst); 1261 if (ret) 1262 return dev_err_probe(dev, ret, "could not deassert reset\n"); 1263 1264 platform_set_drvdata(pdev, sfp); 1265 sfp->gc.parent = dev; 1266 raw_spin_lock_init(&sfp->lock); 1267 mutex_init(&sfp->mutex); 1268 1269 ret = devm_pinctrl_register_and_init(dev, &starfive_desc, sfp, &sfp->pctl); 1270 if (ret) 1271 return dev_err_probe(dev, ret, "could not register pinctrl driver\n"); 1272 1273 if (!of_property_read_u32(dev->of_node, "starfive,signal-group", &value)) { 1274 if (value > 6) 1275 return dev_err_probe(dev, -EINVAL, "invalid signal group %u\n", value); 1276 writel(value, sfp->padctl + IO_PADSHARE_SEL); 1277 } 1278 1279 value = readl(sfp->padctl + IO_PADSHARE_SEL); 1280 switch (value) { 1281 case 0: 1282 sfp->gpios.pin_base = PAD_INVALID_GPIO; 1283 goto out_pinctrl_enable; 1284 case 1: 1285 sfp->gpios.pin_base = PAD_GPIO(0); 1286 break; 1287 case 2: 1288 sfp->gpios.pin_base = PAD_FUNC_SHARE(72); 1289 break; 1290 case 3: 1291 sfp->gpios.pin_base = PAD_FUNC_SHARE(70); 1292 break; 1293 case 4: case 5: case 6: 1294 sfp->gpios.pin_base = PAD_FUNC_SHARE(0); 1295 break; 1296 default: 1297 return dev_err_probe(dev, -EINVAL, "invalid signal group %u\n", value); 1298 } 1299 1300 sfp->gc.label = dev_name(dev); 1301 sfp->gc.owner = THIS_MODULE; 1302 sfp->gc.request = pinctrl_gpio_request; 1303 sfp->gc.free = pinctrl_gpio_free; 1304 sfp->gc.get_direction = starfive_gpio_get_direction; 1305 sfp->gc.direction_input = starfive_gpio_direction_input; 1306 sfp->gc.direction_output = starfive_gpio_direction_output; 1307 sfp->gc.get = starfive_gpio_get; 1308 sfp->gc.set = starfive_gpio_set; 1309 sfp->gc.set_config = starfive_gpio_set_config; 1310 sfp->gc.add_pin_ranges = starfive_gpio_add_pin_ranges; 1311 sfp->gc.base = -1; 1312 sfp->gc.ngpio = NR_GPIOS; 1313 1314 gpio_irq_chip_set_chip(&sfp->gc.irq, &starfive_irq_chip); 1315 sfp->gc.irq.parent_handler = starfive_gpio_irq_handler; 1316 sfp->gc.irq.num_parents = 1; 1317 sfp->gc.irq.parents = devm_kcalloc(dev, sfp->gc.irq.num_parents, 1318 sizeof(*sfp->gc.irq.parents), GFP_KERNEL); 1319 if (!sfp->gc.irq.parents) 1320 return -ENOMEM; 1321 sfp->gc.irq.default_type = IRQ_TYPE_NONE; 1322 sfp->gc.irq.handler = handle_bad_irq; 1323 sfp->gc.irq.init_hw = starfive_gpio_init_hw; 1324 1325 ret = platform_get_irq(pdev, 0); 1326 if (ret < 0) 1327 return ret; 1328 sfp->gc.irq.parents[0] = ret; 1329 1330 ret = devm_gpiochip_add_data(dev, &sfp->gc, sfp); 1331 if (ret) 1332 return dev_err_probe(dev, ret, "could not register gpiochip\n"); 1333 1334 irq_domain_set_pm_device(sfp->gc.irq.domain, dev); 1335 1336 out_pinctrl_enable: 1337 return pinctrl_enable(sfp->pctl); 1338 } 1339 1340 static const struct of_device_id starfive_of_match[] = { 1341 { .compatible = "starfive,jh7100-pinctrl" }, 1342 { /* sentinel */ } 1343 }; 1344 MODULE_DEVICE_TABLE(of, starfive_of_match); 1345 1346 static struct platform_driver starfive_pinctrl_driver = { 1347 .probe = starfive_probe, 1348 .driver = { 1349 .name = DRIVER_NAME, 1350 .of_match_table = starfive_of_match, 1351 }, 1352 }; 1353 module_platform_driver(starfive_pinctrl_driver); 1354 1355 MODULE_DESCRIPTION("Pinctrl driver for StarFive SoCs"); 1356 MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>"); 1357 MODULE_LICENSE("GPL v2"); 1358