1 /* 2 * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; version 2 of the License. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. 16 */ 17 #include <linux/module.h> 18 #include <linux/kernel.h> 19 #include <linux/pci.h> 20 #include <linux/gpio.h> 21 #include <linux/interrupt.h> 22 #include <linux/irq.h> 23 #include <linux/slab.h> 24 25 #define PCH_EDGE_FALLING 0 26 #define PCH_EDGE_RISING BIT(0) 27 #define PCH_LEVEL_L BIT(1) 28 #define PCH_LEVEL_H (BIT(0) | BIT(1)) 29 #define PCH_EDGE_BOTH BIT(2) 30 #define PCH_IM_MASK (BIT(0) | BIT(1) | BIT(2)) 31 32 #define PCH_IRQ_BASE 24 33 34 struct pch_regs { 35 u32 ien; 36 u32 istatus; 37 u32 idisp; 38 u32 iclr; 39 u32 imask; 40 u32 imaskclr; 41 u32 po; 42 u32 pi; 43 u32 pm; 44 u32 im0; 45 u32 im1; 46 u32 reserved[3]; 47 u32 gpio_use_sel; 48 u32 reset; 49 }; 50 51 enum pch_type_t { 52 INTEL_EG20T_PCH, 53 OKISEMI_ML7223m_IOH, /* LAPIS Semiconductor ML7223 IOH PCIe Bus-m */ 54 OKISEMI_ML7223n_IOH /* LAPIS Semiconductor ML7223 IOH PCIe Bus-n */ 55 }; 56 57 /* Specifies number of GPIO PINS */ 58 static int gpio_pins[] = { 59 [INTEL_EG20T_PCH] = 12, 60 [OKISEMI_ML7223m_IOH] = 8, 61 [OKISEMI_ML7223n_IOH] = 8, 62 }; 63 64 /** 65 * struct pch_gpio_reg_data - The register store data. 66 * @ien_reg: To store contents of IEN register. 67 * @imask_reg: To store contents of IMASK register. 68 * @po_reg: To store contents of PO register. 69 * @pm_reg: To store contents of PM register. 70 * @im0_reg: To store contents of IM0 register. 71 * @im1_reg: To store contents of IM1 register. 72 * @gpio_use_sel_reg : To store contents of GPIO_USE_SEL register. 73 * (Only ML7223 Bus-n) 74 */ 75 struct pch_gpio_reg_data { 76 u32 ien_reg; 77 u32 imask_reg; 78 u32 po_reg; 79 u32 pm_reg; 80 u32 im0_reg; 81 u32 im1_reg; 82 u32 gpio_use_sel_reg; 83 }; 84 85 /** 86 * struct pch_gpio - GPIO private data structure. 87 * @base: PCI base address of Memory mapped I/O register. 88 * @reg: Memory mapped PCH GPIO register list. 89 * @dev: Pointer to device structure. 90 * @gpio: Data for GPIO infrastructure. 91 * @pch_gpio_reg: Memory mapped Register data is saved here 92 * when suspend. 93 * @lock: Used for register access protection 94 * @irq_base: Save base of IRQ number for interrupt 95 * @ioh: IOH ID 96 * @spinlock: Used for register access protection 97 */ 98 struct pch_gpio { 99 void __iomem *base; 100 struct pch_regs __iomem *reg; 101 struct device *dev; 102 struct gpio_chip gpio; 103 struct pch_gpio_reg_data pch_gpio_reg; 104 int irq_base; 105 enum pch_type_t ioh; 106 spinlock_t spinlock; 107 }; 108 109 static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val) 110 { 111 u32 reg_val; 112 struct pch_gpio *chip = gpiochip_get_data(gpio); 113 unsigned long flags; 114 115 spin_lock_irqsave(&chip->spinlock, flags); 116 reg_val = ioread32(&chip->reg->po); 117 if (val) 118 reg_val |= (1 << nr); 119 else 120 reg_val &= ~(1 << nr); 121 122 iowrite32(reg_val, &chip->reg->po); 123 spin_unlock_irqrestore(&chip->spinlock, flags); 124 } 125 126 static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr) 127 { 128 struct pch_gpio *chip = gpiochip_get_data(gpio); 129 130 return (ioread32(&chip->reg->pi) >> nr) & 1; 131 } 132 133 static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr, 134 int val) 135 { 136 struct pch_gpio *chip = gpiochip_get_data(gpio); 137 u32 pm; 138 u32 reg_val; 139 unsigned long flags; 140 141 spin_lock_irqsave(&chip->spinlock, flags); 142 143 reg_val = ioread32(&chip->reg->po); 144 if (val) 145 reg_val |= (1 << nr); 146 else 147 reg_val &= ~(1 << nr); 148 iowrite32(reg_val, &chip->reg->po); 149 150 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1); 151 pm |= (1 << nr); 152 iowrite32(pm, &chip->reg->pm); 153 154 spin_unlock_irqrestore(&chip->spinlock, flags); 155 156 return 0; 157 } 158 159 static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr) 160 { 161 struct pch_gpio *chip = gpiochip_get_data(gpio); 162 u32 pm; 163 unsigned long flags; 164 165 spin_lock_irqsave(&chip->spinlock, flags); 166 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1); 167 pm &= ~(1 << nr); 168 iowrite32(pm, &chip->reg->pm); 169 spin_unlock_irqrestore(&chip->spinlock, flags); 170 171 return 0; 172 } 173 174 #ifdef CONFIG_PM 175 /* 176 * Save register configuration and disable interrupts. 177 */ 178 static void pch_gpio_save_reg_conf(struct pch_gpio *chip) 179 { 180 chip->pch_gpio_reg.ien_reg = ioread32(&chip->reg->ien); 181 chip->pch_gpio_reg.imask_reg = ioread32(&chip->reg->imask); 182 chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po); 183 chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm); 184 chip->pch_gpio_reg.im0_reg = ioread32(&chip->reg->im0); 185 if (chip->ioh == INTEL_EG20T_PCH) 186 chip->pch_gpio_reg.im1_reg = ioread32(&chip->reg->im1); 187 if (chip->ioh == OKISEMI_ML7223n_IOH) 188 chip->pch_gpio_reg.gpio_use_sel_reg =\ 189 ioread32(&chip->reg->gpio_use_sel); 190 } 191 192 /* 193 * This function restores the register configuration of the GPIO device. 194 */ 195 static void pch_gpio_restore_reg_conf(struct pch_gpio *chip) 196 { 197 iowrite32(chip->pch_gpio_reg.ien_reg, &chip->reg->ien); 198 iowrite32(chip->pch_gpio_reg.imask_reg, &chip->reg->imask); 199 /* to store contents of PO register */ 200 iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po); 201 /* to store contents of PM register */ 202 iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm); 203 iowrite32(chip->pch_gpio_reg.im0_reg, &chip->reg->im0); 204 if (chip->ioh == INTEL_EG20T_PCH) 205 iowrite32(chip->pch_gpio_reg.im1_reg, &chip->reg->im1); 206 if (chip->ioh == OKISEMI_ML7223n_IOH) 207 iowrite32(chip->pch_gpio_reg.gpio_use_sel_reg, 208 &chip->reg->gpio_use_sel); 209 } 210 #endif 211 212 static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned offset) 213 { 214 struct pch_gpio *chip = gpiochip_get_data(gpio); 215 return chip->irq_base + offset; 216 } 217 218 static void pch_gpio_setup(struct pch_gpio *chip) 219 { 220 struct gpio_chip *gpio = &chip->gpio; 221 222 gpio->label = dev_name(chip->dev); 223 gpio->parent = chip->dev; 224 gpio->owner = THIS_MODULE; 225 gpio->direction_input = pch_gpio_direction_input; 226 gpio->get = pch_gpio_get; 227 gpio->direction_output = pch_gpio_direction_output; 228 gpio->set = pch_gpio_set; 229 gpio->dbg_show = NULL; 230 gpio->base = -1; 231 gpio->ngpio = gpio_pins[chip->ioh]; 232 gpio->can_sleep = false; 233 gpio->to_irq = pch_gpio_to_irq; 234 } 235 236 static int pch_irq_type(struct irq_data *d, unsigned int type) 237 { 238 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 239 struct pch_gpio *chip = gc->private; 240 u32 im, im_pos, val; 241 u32 __iomem *im_reg; 242 unsigned long flags; 243 int ch, irq = d->irq; 244 245 ch = irq - chip->irq_base; 246 if (irq <= chip->irq_base + 7) { 247 im_reg = &chip->reg->im0; 248 im_pos = ch; 249 } else { 250 im_reg = &chip->reg->im1; 251 im_pos = ch - 8; 252 } 253 dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d\n", 254 __func__, irq, type, ch, im_pos); 255 256 spin_lock_irqsave(&chip->spinlock, flags); 257 258 switch (type) { 259 case IRQ_TYPE_EDGE_RISING: 260 val = PCH_EDGE_RISING; 261 break; 262 case IRQ_TYPE_EDGE_FALLING: 263 val = PCH_EDGE_FALLING; 264 break; 265 case IRQ_TYPE_EDGE_BOTH: 266 val = PCH_EDGE_BOTH; 267 break; 268 case IRQ_TYPE_LEVEL_HIGH: 269 val = PCH_LEVEL_H; 270 break; 271 case IRQ_TYPE_LEVEL_LOW: 272 val = PCH_LEVEL_L; 273 break; 274 default: 275 goto unlock; 276 } 277 278 /* Set interrupt mode */ 279 im = ioread32(im_reg) & ~(PCH_IM_MASK << (im_pos * 4)); 280 iowrite32(im | (val << (im_pos * 4)), im_reg); 281 282 /* And the handler */ 283 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) 284 irq_set_handler_locked(d, handle_level_irq); 285 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) 286 irq_set_handler_locked(d, handle_edge_irq); 287 288 unlock: 289 spin_unlock_irqrestore(&chip->spinlock, flags); 290 return 0; 291 } 292 293 static void pch_irq_unmask(struct irq_data *d) 294 { 295 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 296 struct pch_gpio *chip = gc->private; 297 298 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imaskclr); 299 } 300 301 static void pch_irq_mask(struct irq_data *d) 302 { 303 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 304 struct pch_gpio *chip = gc->private; 305 306 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imask); 307 } 308 309 static void pch_irq_ack(struct irq_data *d) 310 { 311 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 312 struct pch_gpio *chip = gc->private; 313 314 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->iclr); 315 } 316 317 static irqreturn_t pch_gpio_handler(int irq, void *dev_id) 318 { 319 struct pch_gpio *chip = dev_id; 320 u32 reg_val = ioread32(&chip->reg->istatus); 321 int i, ret = IRQ_NONE; 322 323 for (i = 0; i < gpio_pins[chip->ioh]; i++) { 324 if (reg_val & BIT(i)) { 325 dev_dbg(chip->dev, "%s:[%d]:irq=%d status=0x%x\n", 326 __func__, i, irq, reg_val); 327 generic_handle_irq(chip->irq_base + i); 328 ret = IRQ_HANDLED; 329 } 330 } 331 return ret; 332 } 333 334 static int pch_gpio_alloc_generic_chip(struct pch_gpio *chip, 335 unsigned int irq_start, 336 unsigned int num) 337 { 338 struct irq_chip_generic *gc; 339 struct irq_chip_type *ct; 340 341 gc = irq_alloc_generic_chip("pch_gpio", 1, irq_start, chip->base, 342 handle_simple_irq); 343 if (!gc) 344 return -ENOMEM; 345 346 gc->private = chip; 347 ct = gc->chip_types; 348 349 ct->chip.irq_ack = pch_irq_ack; 350 ct->chip.irq_mask = pch_irq_mask; 351 ct->chip.irq_unmask = pch_irq_unmask; 352 ct->chip.irq_set_type = pch_irq_type; 353 354 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, 355 IRQ_NOREQUEST | IRQ_NOPROBE, 0); 356 357 return 0; 358 } 359 360 static int pch_gpio_probe(struct pci_dev *pdev, 361 const struct pci_device_id *id) 362 { 363 s32 ret; 364 struct pch_gpio *chip; 365 int irq_base; 366 u32 msk; 367 368 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 369 if (chip == NULL) 370 return -ENOMEM; 371 372 chip->dev = &pdev->dev; 373 ret = pci_enable_device(pdev); 374 if (ret) { 375 dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__); 376 goto err_pci_enable; 377 } 378 379 ret = pci_request_regions(pdev, KBUILD_MODNAME); 380 if (ret) { 381 dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret); 382 goto err_request_regions; 383 } 384 385 chip->base = pci_iomap(pdev, 1, 0); 386 if (!chip->base) { 387 dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__); 388 ret = -ENOMEM; 389 goto err_iomap; 390 } 391 392 if (pdev->device == 0x8803) 393 chip->ioh = INTEL_EG20T_PCH; 394 else if (pdev->device == 0x8014) 395 chip->ioh = OKISEMI_ML7223m_IOH; 396 else if (pdev->device == 0x8043) 397 chip->ioh = OKISEMI_ML7223n_IOH; 398 399 chip->reg = chip->base; 400 pci_set_drvdata(pdev, chip); 401 spin_lock_init(&chip->spinlock); 402 pch_gpio_setup(chip); 403 #ifdef CONFIG_OF_GPIO 404 chip->gpio.of_node = pdev->dev.of_node; 405 #endif 406 ret = gpiochip_add_data(&chip->gpio, chip); 407 if (ret) { 408 dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n"); 409 goto err_gpiochip_add; 410 } 411 412 irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, 413 gpio_pins[chip->ioh], NUMA_NO_NODE); 414 if (irq_base < 0) { 415 dev_warn(&pdev->dev, "PCH gpio: Failed to get IRQ base num\n"); 416 chip->irq_base = -1; 417 goto end; 418 } 419 chip->irq_base = irq_base; 420 421 /* Mask all interrupts, but enable them */ 422 msk = (1 << gpio_pins[chip->ioh]) - 1; 423 iowrite32(msk, &chip->reg->imask); 424 iowrite32(msk, &chip->reg->ien); 425 426 ret = devm_request_irq(&pdev->dev, pdev->irq, pch_gpio_handler, 427 IRQF_SHARED, KBUILD_MODNAME, chip); 428 if (ret != 0) { 429 dev_err(&pdev->dev, 430 "%s request_irq failed\n", __func__); 431 goto err_request_irq; 432 } 433 434 ret = pch_gpio_alloc_generic_chip(chip, irq_base, 435 gpio_pins[chip->ioh]); 436 if (ret) 437 goto err_request_irq; 438 439 end: 440 return 0; 441 442 err_request_irq: 443 gpiochip_remove(&chip->gpio); 444 445 err_gpiochip_add: 446 pci_iounmap(pdev, chip->base); 447 448 err_iomap: 449 pci_release_regions(pdev); 450 451 err_request_regions: 452 pci_disable_device(pdev); 453 454 err_pci_enable: 455 kfree(chip); 456 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret); 457 return ret; 458 } 459 460 static void pch_gpio_remove(struct pci_dev *pdev) 461 { 462 struct pch_gpio *chip = pci_get_drvdata(pdev); 463 464 gpiochip_remove(&chip->gpio); 465 pci_iounmap(pdev, chip->base); 466 pci_release_regions(pdev); 467 pci_disable_device(pdev); 468 kfree(chip); 469 } 470 471 #ifdef CONFIG_PM 472 static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state) 473 { 474 s32 ret; 475 struct pch_gpio *chip = pci_get_drvdata(pdev); 476 unsigned long flags; 477 478 spin_lock_irqsave(&chip->spinlock, flags); 479 pch_gpio_save_reg_conf(chip); 480 spin_unlock_irqrestore(&chip->spinlock, flags); 481 482 ret = pci_save_state(pdev); 483 if (ret) { 484 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret); 485 return ret; 486 } 487 pci_disable_device(pdev); 488 pci_set_power_state(pdev, PCI_D0); 489 ret = pci_enable_wake(pdev, PCI_D0, 1); 490 if (ret) 491 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret); 492 493 return 0; 494 } 495 496 static int pch_gpio_resume(struct pci_dev *pdev) 497 { 498 s32 ret; 499 struct pch_gpio *chip = pci_get_drvdata(pdev); 500 unsigned long flags; 501 502 ret = pci_enable_wake(pdev, PCI_D0, 0); 503 504 pci_set_power_state(pdev, PCI_D0); 505 ret = pci_enable_device(pdev); 506 if (ret) { 507 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret); 508 return ret; 509 } 510 pci_restore_state(pdev); 511 512 spin_lock_irqsave(&chip->spinlock, flags); 513 iowrite32(0x01, &chip->reg->reset); 514 iowrite32(0x00, &chip->reg->reset); 515 pch_gpio_restore_reg_conf(chip); 516 spin_unlock_irqrestore(&chip->spinlock, flags); 517 518 return 0; 519 } 520 #else 521 #define pch_gpio_suspend NULL 522 #define pch_gpio_resume NULL 523 #endif 524 525 #define PCI_VENDOR_ID_ROHM 0x10DB 526 static const struct pci_device_id pch_gpio_pcidev_id[] = { 527 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) }, 528 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8014) }, 529 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8043) }, 530 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8803) }, 531 { 0, } 532 }; 533 MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id); 534 535 static struct pci_driver pch_gpio_driver = { 536 .name = "pch_gpio", 537 .id_table = pch_gpio_pcidev_id, 538 .probe = pch_gpio_probe, 539 .remove = pch_gpio_remove, 540 .suspend = pch_gpio_suspend, 541 .resume = pch_gpio_resume 542 }; 543 544 module_pci_driver(pch_gpio_driver); 545 546 MODULE_DESCRIPTION("PCH GPIO PCI Driver"); 547 MODULE_LICENSE("GPL"); 548