1// SPDX-License-Identifier: GPL-2.0 2// Copyright (C) 2022 Microchip Technology Inc. 3// pci1xxxx gpio driver 4 5#include <linux/module.h> 6#include <linux/spinlock.h> 7#include <linux/gpio/driver.h> 8#include <linux/bio.h> 9#include <linux/mutex.h> 10#include <linux/kthread.h> 11#include <linux/interrupt.h> 12 13#include "mchp_pci1xxxx_gp.h" 14 15#define PCI1XXXX_NR_PINS 93 16#define PERI_GEN_RESET 0 17#define OUT_EN_OFFSET(x) ((((x) / 32) * 4) + 0x400) 18#define INP_EN_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x10) 19#define OUT_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x20) 20#define INP_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x30) 21#define PULLUP_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x40) 22#define PULLDOWN_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x50) 23#define OPENDRAIN_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x60) 24#define WAKEMASK_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x70) 25#define MODE_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x80) 26#define INTR_LO_TO_HI_EDGE_CONFIG(x) ((((x) / 32) * 4) + 0x400 + 0x90) 27#define INTR_HI_TO_LO_EDGE_CONFIG(x) ((((x) / 32) * 4) + 0x400 + 0xA0) 28#define INTR_LEVEL_CONFIG_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xB0) 29#define INTR_LEVEL_MASK_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xC0) 30#define INTR_STAT_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xD0) 31#define DEBOUNCE_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xE0) 32#define PIO_GLOBAL_CONFIG_OFFSET (0x400 + 0xF0) 33#define PIO_PCI_CTRL_REG_OFFSET (0x400 + 0xF4) 34#define INTR_MASK_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x100) 35#define INTR_STATUS_OFFSET(x) (((x) * 4) + 0x400 + 0xD0) 36 37struct pci1xxxx_gpio { 38 struct auxiliary_device *aux_dev; 39 void __iomem *reg_base; 40 struct gpio_chip gpio; 41 spinlock_t lock; 42 int irq_base; 43}; 44 45static int pci1xxxx_gpio_get_direction(struct gpio_chip *gpio, unsigned int nr) 46{ 47 struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio); 48 u32 data; 49 int ret = -EINVAL; 50 51 data = readl(priv->reg_base + INP_EN_OFFSET(nr)); 52 if (data & BIT(nr % 32)) { 53 ret = 1; 54 } else { 55 data = readl(priv->reg_base + OUT_EN_OFFSET(nr)); 56 if (data & BIT(nr % 32)) 57 ret = 0; 58 } 59 60 return ret; 61} 62 63static inline void pci1xxx_assign_bit(void __iomem *base_addr, unsigned int reg_offset, 64 unsigned int bitpos, bool set) 65{ 66 u32 data; 67 68 data = readl(base_addr + reg_offset); 69 if (set) 70 data |= BIT(bitpos); 71 else 72 data &= ~BIT(bitpos); 73 writel(data, base_addr + reg_offset); 74} 75 76static int pci1xxxx_gpio_direction_input(struct gpio_chip *gpio, unsigned int nr) 77{ 78 struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio); 79 unsigned long flags; 80 81 spin_lock_irqsave(&priv->lock, flags); 82 pci1xxx_assign_bit(priv->reg_base, INP_EN_OFFSET(nr), (nr % 32), true); 83 pci1xxx_assign_bit(priv->reg_base, OUT_EN_OFFSET(nr), (nr % 32), false); 84 spin_unlock_irqrestore(&priv->lock, flags); 85 86 return 0; 87} 88 89static int pci1xxxx_gpio_get(struct gpio_chip *gpio, unsigned int nr) 90{ 91 struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio); 92 93 return (readl(priv->reg_base + INP_OFFSET(nr)) >> (nr % 32)) & 1; 94} 95 96static int pci1xxxx_gpio_direction_output(struct gpio_chip *gpio, 97 unsigned int nr, int val) 98{ 99 struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio); 100 unsigned long flags; 101 u32 data; 102 103 spin_lock_irqsave(&priv->lock, flags); 104 pci1xxx_assign_bit(priv->reg_base, INP_EN_OFFSET(nr), (nr % 32), false); 105 pci1xxx_assign_bit(priv->reg_base, OUT_EN_OFFSET(nr), (nr % 32), true); 106 data = readl(priv->reg_base + OUT_OFFSET(nr)); 107 if (val) 108 data |= (1 << (nr % 32)); 109 else 110 data &= ~(1 << (nr % 32)); 111 writel(data, priv->reg_base + OUT_OFFSET(nr)); 112 spin_unlock_irqrestore(&priv->lock, flags); 113 114 return 0; 115} 116 117static void pci1xxxx_gpio_set(struct gpio_chip *gpio, 118 unsigned int nr, int val) 119{ 120 struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio); 121 unsigned long flags; 122 123 spin_lock_irqsave(&priv->lock, flags); 124 pci1xxx_assign_bit(priv->reg_base, OUT_OFFSET(nr), (nr % 32), val); 125 spin_unlock_irqrestore(&priv->lock, flags); 126} 127 128static int pci1xxxx_gpio_set_config(struct gpio_chip *gpio, unsigned int offset, 129 unsigned long config) 130{ 131 struct pci1xxxx_gpio *priv = gpiochip_get_data(gpio); 132 unsigned long flags; 133 int ret = 0; 134 135 spin_lock_irqsave(&priv->lock, flags); 136 switch (pinconf_to_config_param(config)) { 137 case PIN_CONFIG_BIAS_PULL_UP: 138 pci1xxx_assign_bit(priv->reg_base, PULLUP_OFFSET(offset), (offset % 32), true); 139 break; 140 case PIN_CONFIG_BIAS_PULL_DOWN: 141 pci1xxx_assign_bit(priv->reg_base, PULLDOWN_OFFSET(offset), (offset % 32), true); 142 break; 143 case PIN_CONFIG_BIAS_DISABLE: 144 pci1xxx_assign_bit(priv->reg_base, PULLUP_OFFSET(offset), (offset % 32), false); 145 pci1xxx_assign_bit(priv->reg_base, PULLDOWN_OFFSET(offset), (offset % 32), false); 146 break; 147 case PIN_CONFIG_DRIVE_OPEN_DRAIN: 148 pci1xxx_assign_bit(priv->reg_base, OPENDRAIN_OFFSET(offset), (offset % 32), true); 149 break; 150 default: 151 ret = -EOPNOTSUPP; 152 break; 153 } 154 spin_unlock_irqrestore(&priv->lock, flags); 155 156 return ret; 157} 158 159static void pci1xxxx_gpio_irq_ack(struct irq_data *data) 160{ 161 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 162 struct pci1xxxx_gpio *priv = gpiochip_get_data(chip); 163 unsigned int gpio = irqd_to_hwirq(data); 164 unsigned long flags; 165 166 spin_lock_irqsave(&priv->lock, flags); 167 pci1xxx_assign_bit(priv->reg_base, INTR_STAT_OFFSET(gpio), (gpio % 32), true); 168 spin_unlock_irqrestore(&priv->lock, flags); 169} 170 171static void pci1xxxx_gpio_irq_set_mask(struct irq_data *data, bool set) 172{ 173 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 174 struct pci1xxxx_gpio *priv = gpiochip_get_data(chip); 175 unsigned int gpio = irqd_to_hwirq(data); 176 unsigned long flags; 177 178 if (!set) 179 gpiochip_enable_irq(chip, gpio); 180 spin_lock_irqsave(&priv->lock, flags); 181 pci1xxx_assign_bit(priv->reg_base, INTR_MASK_OFFSET(gpio), (gpio % 32), set); 182 spin_unlock_irqrestore(&priv->lock, flags); 183 if (set) 184 gpiochip_disable_irq(chip, gpio); 185} 186 187static void pci1xxxx_gpio_irq_mask(struct irq_data *data) 188{ 189 pci1xxxx_gpio_irq_set_mask(data, true); 190} 191 192static void pci1xxxx_gpio_irq_unmask(struct irq_data *data) 193{ 194 pci1xxxx_gpio_irq_set_mask(data, false); 195} 196 197static int pci1xxxx_gpio_set_type(struct irq_data *data, unsigned int trigger_type) 198{ 199 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 200 struct pci1xxxx_gpio *priv = gpiochip_get_data(chip); 201 unsigned int gpio = irqd_to_hwirq(data); 202 unsigned int bitpos = gpio % 32; 203 204 if (trigger_type & IRQ_TYPE_EDGE_FALLING) { 205 pci1xxx_assign_bit(priv->reg_base, INTR_HI_TO_LO_EDGE_CONFIG(gpio), 206 bitpos, false); 207 pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio), 208 bitpos, false); 209 irq_set_handler_locked(data, handle_edge_irq); 210 } else { 211 pci1xxx_assign_bit(priv->reg_base, INTR_HI_TO_LO_EDGE_CONFIG(gpio), 212 bitpos, true); 213 } 214 215 if (trigger_type & IRQ_TYPE_EDGE_RISING) { 216 pci1xxx_assign_bit(priv->reg_base, INTR_LO_TO_HI_EDGE_CONFIG(gpio), 217 bitpos, false); 218 pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio), bitpos, 219 false); 220 irq_set_handler_locked(data, handle_edge_irq); 221 } else { 222 pci1xxx_assign_bit(priv->reg_base, INTR_LO_TO_HI_EDGE_CONFIG(gpio), 223 bitpos, true); 224 } 225 226 if (trigger_type & IRQ_TYPE_LEVEL_LOW) { 227 pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_CONFIG_OFFSET(gpio), 228 bitpos, true); 229 pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_MASK_OFFSET(gpio), 230 bitpos, false); 231 pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio), bitpos, 232 true); 233 irq_set_handler_locked(data, handle_edge_irq); 234 } 235 236 if (trigger_type & IRQ_TYPE_LEVEL_HIGH) { 237 pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_CONFIG_OFFSET(gpio), 238 bitpos, false); 239 pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_MASK_OFFSET(gpio), 240 bitpos, false); 241 pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio), bitpos, 242 true); 243 irq_set_handler_locked(data, handle_edge_irq); 244 } 245 246 if ((!(trigger_type & IRQ_TYPE_LEVEL_LOW)) && (!(trigger_type & IRQ_TYPE_LEVEL_HIGH))) 247 pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_MASK_OFFSET(gpio), bitpos, true); 248 249 return true; 250} 251 252static irqreturn_t pci1xxxx_gpio_irq_handler(int irq, void *dev_id) 253{ 254 struct pci1xxxx_gpio *priv = dev_id; 255 struct gpio_chip *gc = &priv->gpio; 256 unsigned long int_status = 0; 257 unsigned long flags; 258 u8 pincount; 259 int bit; 260 u8 gpiobank; 261 262 spin_lock_irqsave(&priv->lock, flags); 263 pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET, 16, true); 264 spin_unlock_irqrestore(&priv->lock, flags); 265 for (gpiobank = 0; gpiobank < 3; gpiobank++) { 266 spin_lock_irqsave(&priv->lock, flags); 267 int_status = readl(priv->reg_base + INTR_STATUS_OFFSET(gpiobank)); 268 spin_unlock_irqrestore(&priv->lock, flags); 269 if (gpiobank == 2) 270 pincount = 29; 271 else 272 pincount = 32; 273 for_each_set_bit(bit, &int_status, pincount) { 274 unsigned int irq; 275 276 spin_lock_irqsave(&priv->lock, flags); 277 writel(BIT(bit), priv->reg_base + INTR_STATUS_OFFSET(gpiobank)); 278 spin_unlock_irqrestore(&priv->lock, flags); 279 irq = irq_find_mapping(gc->irq.domain, (bit + (gpiobank * 32))); 280 generic_handle_irq(irq); 281 } 282 } 283 spin_lock_irqsave(&priv->lock, flags); 284 pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET, 16, false); 285 spin_unlock_irqrestore(&priv->lock, flags); 286 287 return IRQ_HANDLED; 288} 289 290static const struct irq_chip pci1xxxx_gpio_irqchip = { 291 .name = "pci1xxxx_gpio", 292 .irq_ack = pci1xxxx_gpio_irq_ack, 293 .irq_mask = pci1xxxx_gpio_irq_mask, 294 .irq_unmask = pci1xxxx_gpio_irq_unmask, 295 .irq_set_type = pci1xxxx_gpio_set_type, 296 .flags = IRQCHIP_IMMUTABLE, 297 GPIOCHIP_IRQ_RESOURCE_HELPERS, 298}; 299 300static int pci1xxxx_gpio_suspend(struct device *dev) 301{ 302 struct pci1xxxx_gpio *priv = dev_get_drvdata(dev); 303 unsigned long flags; 304 305 spin_lock_irqsave(&priv->lock, flags); 306 pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET, 307 16, true); 308 pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET, 309 17, false); 310 pci1xxx_assign_bit(priv->reg_base, PERI_GEN_RESET, 16, true); 311 spin_unlock_irqrestore(&priv->lock, flags); 312 313 return 0; 314} 315 316static int pci1xxxx_gpio_resume(struct device *dev) 317{ 318 struct pci1xxxx_gpio *priv = dev_get_drvdata(dev); 319 unsigned long flags; 320 321 spin_lock_irqsave(&priv->lock, flags); 322 pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET, 323 17, true); 324 pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET, 325 16, false); 326 pci1xxx_assign_bit(priv->reg_base, PERI_GEN_RESET, 16, false); 327 spin_unlock_irqrestore(&priv->lock, flags); 328 329 return 0; 330} 331 332static int pci1xxxx_gpio_setup(struct pci1xxxx_gpio *priv, int irq) 333{ 334 struct gpio_chip *gchip = &priv->gpio; 335 struct gpio_irq_chip *girq; 336 int retval; 337 338 gchip->label = dev_name(&priv->aux_dev->dev); 339 gchip->parent = &priv->aux_dev->dev; 340 gchip->owner = THIS_MODULE; 341 gchip->direction_input = pci1xxxx_gpio_direction_input; 342 gchip->direction_output = pci1xxxx_gpio_direction_output; 343 gchip->get_direction = pci1xxxx_gpio_get_direction; 344 gchip->get = pci1xxxx_gpio_get; 345 gchip->set = pci1xxxx_gpio_set; 346 gchip->set_config = pci1xxxx_gpio_set_config; 347 gchip->dbg_show = NULL; 348 gchip->base = -1; 349 gchip->ngpio = PCI1XXXX_NR_PINS; 350 gchip->can_sleep = false; 351 352 retval = devm_request_threaded_irq(&priv->aux_dev->dev, irq, 353 NULL, pci1xxxx_gpio_irq_handler, 354 IRQF_ONESHOT, "PCI1xxxxGPIO", priv); 355 356 if (retval) 357 return retval; 358 359 girq = &priv->gpio.irq; 360 gpio_irq_chip_set_chip(girq, &pci1xxxx_gpio_irqchip); 361 girq->parent_handler = NULL; 362 girq->num_parents = 0; 363 girq->parents = NULL; 364 girq->default_type = IRQ_TYPE_NONE; 365 girq->handler = handle_bad_irq; 366 367 return 0; 368} 369 370static int pci1xxxx_gpio_probe(struct auxiliary_device *aux_dev, 371 const struct auxiliary_device_id *id) 372 373{ 374 struct auxiliary_device_wrapper *aux_dev_wrapper; 375 struct gp_aux_data_type *pdata; 376 struct pci1xxxx_gpio *priv; 377 int retval; 378 379 aux_dev_wrapper = (struct auxiliary_device_wrapper *) 380 container_of(aux_dev, struct auxiliary_device_wrapper, aux_dev); 381 382 pdata = &aux_dev_wrapper->gp_aux_data; 383 384 if (!pdata) 385 return -EINVAL; 386 387 priv = devm_kzalloc(&aux_dev->dev, sizeof(struct pci1xxxx_gpio), GFP_KERNEL); 388 if (!priv) 389 return -ENOMEM; 390 391 spin_lock_init(&priv->lock); 392 priv->aux_dev = aux_dev; 393 394 if (!devm_request_mem_region(&aux_dev->dev, pdata->region_start, 0x800, aux_dev->name)) 395 return -EBUSY; 396 397 priv->reg_base = devm_ioremap(&aux_dev->dev, pdata->region_start, 0x800); 398 if (!priv->reg_base) 399 return -ENOMEM; 400 401 writel(0x0264, (priv->reg_base + 0x400 + 0xF0)); 402 403 retval = pci1xxxx_gpio_setup(priv, pdata->irq_num); 404 405 if (retval < 0) 406 return retval; 407 408 dev_set_drvdata(&aux_dev->dev, priv); 409 410 return devm_gpiochip_add_data(&aux_dev->dev, &priv->gpio, priv); 411} 412 413static DEFINE_SIMPLE_DEV_PM_OPS(pci1xxxx_gpio_pm_ops, pci1xxxx_gpio_suspend, pci1xxxx_gpio_resume); 414 415static const struct auxiliary_device_id pci1xxxx_gpio_auxiliary_id_table[] = { 416 {.name = "mchp_pci1xxxx_gp.gp_gpio"}, 417 {} 418}; 419MODULE_DEVICE_TABLE(auxiliary, pci1xxxx_gpio_auxiliary_id_table); 420 421static struct auxiliary_driver pci1xxxx_gpio_driver = { 422 .driver = { 423 .name = "PCI1xxxxGPIO", 424 .pm = &pci1xxxx_gpio_pm_ops, 425 }, 426 .probe = pci1xxxx_gpio_probe, 427 .id_table = pci1xxxx_gpio_auxiliary_id_table 428}; 429module_auxiliary_driver(pci1xxxx_gpio_driver); 430 431MODULE_DESCRIPTION("Microchip Technology Inc. PCI1xxxx GPIO controller"); 432MODULE_AUTHOR("Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>"); 433MODULE_LICENSE("GPL"); 434