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 24 #define PCH_EDGE_FALLING 0 25 #define PCH_EDGE_RISING BIT(0) 26 #define PCH_LEVEL_L BIT(1) 27 #define PCH_LEVEL_H (BIT(0) | BIT(1)) 28 #define PCH_EDGE_BOTH BIT(2) 29 #define PCH_IM_MASK (BIT(0) | BIT(1) | BIT(2)) 30 31 #define PCH_IRQ_BASE 24 32 33 struct pch_regs { 34 u32 ien; 35 u32 istatus; 36 u32 idisp; 37 u32 iclr; 38 u32 imask; 39 u32 imaskclr; 40 u32 po; 41 u32 pi; 42 u32 pm; 43 u32 im0; 44 u32 im1; 45 u32 reserved[3]; 46 u32 gpio_use_sel; 47 u32 reset; 48 }; 49 50 enum pch_type_t { 51 INTEL_EG20T_PCH, 52 OKISEMI_ML7223m_IOH, /* LAPIS Semiconductor ML7223 IOH PCIe Bus-m */ 53 OKISEMI_ML7223n_IOH /* LAPIS Semiconductor ML7223 IOH PCIe Bus-n */ 54 }; 55 56 /* Specifies number of GPIO PINS */ 57 static int gpio_pins[] = { 58 [INTEL_EG20T_PCH] = 12, 59 [OKISEMI_ML7223m_IOH] = 8, 60 [OKISEMI_ML7223n_IOH] = 8, 61 }; 62 63 /** 64 * struct pch_gpio_reg_data - The register store data. 65 * @ien_reg: To store contents of IEN register. 66 * @imask_reg: To store contents of IMASK register. 67 * @po_reg: To store contents of PO register. 68 * @pm_reg: To store contents of PM register. 69 * @im0_reg: To store contents of IM0 register. 70 * @im1_reg: To store contents of IM1 register. 71 * @gpio_use_sel_reg : To store contents of GPIO_USE_SEL register. 72 * (Only ML7223 Bus-n) 73 */ 74 struct pch_gpio_reg_data { 75 u32 ien_reg; 76 u32 imask_reg; 77 u32 po_reg; 78 u32 pm_reg; 79 u32 im0_reg; 80 u32 im1_reg; 81 u32 gpio_use_sel_reg; 82 }; 83 84 /** 85 * struct pch_gpio - GPIO private data structure. 86 * @base: PCI base address of Memory mapped I/O register. 87 * @reg: Memory mapped PCH GPIO register list. 88 * @dev: Pointer to device structure. 89 * @gpio: Data for GPIO infrastructure. 90 * @pch_gpio_reg: Memory mapped Register data is saved here 91 * when suspend. 92 * @lock: Used for register access protection 93 * @irq_base: Save base of IRQ number for interrupt 94 * @ioh: IOH ID 95 * @spinlock: Used for register access protection in 96 * interrupt context pch_irq_mask, 97 * pch_irq_unmask and pch_irq_type; 98 */ 99 struct pch_gpio { 100 void __iomem *base; 101 struct pch_regs __iomem *reg; 102 struct device *dev; 103 struct gpio_chip gpio; 104 struct pch_gpio_reg_data pch_gpio_reg; 105 struct mutex lock; 106 int irq_base; 107 enum pch_type_t ioh; 108 spinlock_t spinlock; 109 }; 110 111 static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val) 112 { 113 u32 reg_val; 114 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); 115 116 mutex_lock(&chip->lock); 117 reg_val = ioread32(&chip->reg->po); 118 if (val) 119 reg_val |= (1 << nr); 120 else 121 reg_val &= ~(1 << nr); 122 123 iowrite32(reg_val, &chip->reg->po); 124 mutex_unlock(&chip->lock); 125 } 126 127 static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr) 128 { 129 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); 130 131 return ioread32(&chip->reg->pi) & (1 << nr); 132 } 133 134 static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr, 135 int val) 136 { 137 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); 138 u32 pm; 139 u32 reg_val; 140 141 mutex_lock(&chip->lock); 142 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1); 143 pm |= (1 << nr); 144 iowrite32(pm, &chip->reg->pm); 145 146 reg_val = ioread32(&chip->reg->po); 147 if (val) 148 reg_val |= (1 << nr); 149 else 150 reg_val &= ~(1 << nr); 151 iowrite32(reg_val, &chip->reg->po); 152 153 mutex_unlock(&chip->lock); 154 155 return 0; 156 } 157 158 static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr) 159 { 160 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); 161 u32 pm; 162 163 mutex_lock(&chip->lock); 164 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1); 165 pm &= ~(1 << nr); 166 iowrite32(pm, &chip->reg->pm); 167 mutex_unlock(&chip->lock); 168 169 return 0; 170 } 171 172 /* 173 * Save register configuration and disable interrupts. 174 */ 175 static void pch_gpio_save_reg_conf(struct pch_gpio *chip) 176 { 177 chip->pch_gpio_reg.ien_reg = ioread32(&chip->reg->ien); 178 chip->pch_gpio_reg.imask_reg = ioread32(&chip->reg->imask); 179 chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po); 180 chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm); 181 chip->pch_gpio_reg.im0_reg = ioread32(&chip->reg->im0); 182 if (chip->ioh == INTEL_EG20T_PCH) 183 chip->pch_gpio_reg.im1_reg = ioread32(&chip->reg->im1); 184 if (chip->ioh == OKISEMI_ML7223n_IOH) 185 chip->pch_gpio_reg.gpio_use_sel_reg =\ 186 ioread32(&chip->reg->gpio_use_sel); 187 } 188 189 /* 190 * This function restores the register configuration of the GPIO device. 191 */ 192 static void pch_gpio_restore_reg_conf(struct pch_gpio *chip) 193 { 194 iowrite32(chip->pch_gpio_reg.ien_reg, &chip->reg->ien); 195 iowrite32(chip->pch_gpio_reg.imask_reg, &chip->reg->imask); 196 /* to store contents of PO register */ 197 iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po); 198 /* to store contents of PM register */ 199 iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm); 200 iowrite32(chip->pch_gpio_reg.im0_reg, &chip->reg->im0); 201 if (chip->ioh == INTEL_EG20T_PCH) 202 iowrite32(chip->pch_gpio_reg.im1_reg, &chip->reg->im1); 203 if (chip->ioh == OKISEMI_ML7223n_IOH) 204 iowrite32(chip->pch_gpio_reg.gpio_use_sel_reg, 205 &chip->reg->gpio_use_sel); 206 } 207 208 static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned offset) 209 { 210 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); 211 return chip->irq_base + offset; 212 } 213 214 static void pch_gpio_setup(struct pch_gpio *chip) 215 { 216 struct gpio_chip *gpio = &chip->gpio; 217 218 gpio->label = dev_name(chip->dev); 219 gpio->owner = THIS_MODULE; 220 gpio->direction_input = pch_gpio_direction_input; 221 gpio->get = pch_gpio_get; 222 gpio->direction_output = pch_gpio_direction_output; 223 gpio->set = pch_gpio_set; 224 gpio->dbg_show = NULL; 225 gpio->base = -1; 226 gpio->ngpio = gpio_pins[chip->ioh]; 227 gpio->can_sleep = 0; 228 gpio->to_irq = pch_gpio_to_irq; 229 } 230 231 static int pch_irq_type(struct irq_data *d, unsigned int type) 232 { 233 u32 im; 234 u32 __iomem *im_reg; 235 u32 ien; 236 u32 im_pos; 237 int ch; 238 unsigned long flags; 239 u32 val; 240 int irq = d->irq; 241 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 242 struct pch_gpio *chip = gc->private; 243 244 ch = irq - chip->irq_base; 245 if (irq <= chip->irq_base + 7) { 246 im_reg = &chip->reg->im0; 247 im_pos = ch; 248 } else { 249 im_reg = &chip->reg->im1; 250 im_pos = ch - 8; 251 } 252 dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d\n", 253 __func__, irq, type, ch, im_pos); 254 255 spin_lock_irqsave(&chip->spinlock, flags); 256 257 switch (type) { 258 case IRQ_TYPE_EDGE_RISING: 259 val = PCH_EDGE_RISING; 260 break; 261 case IRQ_TYPE_EDGE_FALLING: 262 val = PCH_EDGE_FALLING; 263 break; 264 case IRQ_TYPE_EDGE_BOTH: 265 val = PCH_EDGE_BOTH; 266 break; 267 case IRQ_TYPE_LEVEL_HIGH: 268 val = PCH_LEVEL_H; 269 break; 270 case IRQ_TYPE_LEVEL_LOW: 271 val = PCH_LEVEL_L; 272 break; 273 case IRQ_TYPE_PROBE: 274 goto end; 275 default: 276 dev_warn(chip->dev, "%s: unknown type(%dd)", 277 __func__, type); 278 goto end; 279 } 280 281 /* Set interrupt mode */ 282 im = ioread32(im_reg) & ~(PCH_IM_MASK << (im_pos * 4)); 283 iowrite32(im | (val << (im_pos * 4)), im_reg); 284 285 /* iclr */ 286 iowrite32(BIT(ch), &chip->reg->iclr); 287 288 /* IMASKCLR */ 289 iowrite32(BIT(ch), &chip->reg->imaskclr); 290 291 /* Enable interrupt */ 292 ien = ioread32(&chip->reg->ien); 293 iowrite32(ien | BIT(ch), &chip->reg->ien); 294 end: 295 spin_unlock_irqrestore(&chip->spinlock, flags); 296 297 return 0; 298 } 299 300 static void pch_irq_unmask(struct irq_data *d) 301 { 302 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 303 struct pch_gpio *chip = gc->private; 304 305 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imaskclr); 306 } 307 308 static void pch_irq_mask(struct irq_data *d) 309 { 310 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 311 struct pch_gpio *chip = gc->private; 312 313 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imask); 314 } 315 316 static irqreturn_t pch_gpio_handler(int irq, void *dev_id) 317 { 318 struct pch_gpio *chip = dev_id; 319 u32 reg_val = ioread32(&chip->reg->istatus); 320 int i; 321 int 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 iowrite32(BIT(i), &chip->reg->iclr); 328 generic_handle_irq(chip->irq_base + i); 329 ret = IRQ_HANDLED; 330 } 331 } 332 return ret; 333 } 334 335 static __devinit void pch_gpio_alloc_generic_chip(struct pch_gpio *chip, 336 unsigned int irq_start, 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 gc->private = chip; 344 ct = gc->chip_types; 345 346 ct->chip.irq_mask = pch_irq_mask; 347 ct->chip.irq_unmask = pch_irq_unmask; 348 ct->chip.irq_set_type = pch_irq_type; 349 350 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, 351 IRQ_NOREQUEST | IRQ_NOPROBE, 0); 352 } 353 354 static int __devinit pch_gpio_probe(struct pci_dev *pdev, 355 const struct pci_device_id *id) 356 { 357 s32 ret; 358 struct pch_gpio *chip; 359 int irq_base; 360 361 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 362 if (chip == NULL) 363 return -ENOMEM; 364 365 chip->dev = &pdev->dev; 366 ret = pci_enable_device(pdev); 367 if (ret) { 368 dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__); 369 goto err_pci_enable; 370 } 371 372 ret = pci_request_regions(pdev, KBUILD_MODNAME); 373 if (ret) { 374 dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret); 375 goto err_request_regions; 376 } 377 378 chip->base = pci_iomap(pdev, 1, 0); 379 if (!chip->base) { 380 dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__); 381 ret = -ENOMEM; 382 goto err_iomap; 383 } 384 385 if (pdev->device == 0x8803) 386 chip->ioh = INTEL_EG20T_PCH; 387 else if (pdev->device == 0x8014) 388 chip->ioh = OKISEMI_ML7223m_IOH; 389 else if (pdev->device == 0x8043) 390 chip->ioh = OKISEMI_ML7223n_IOH; 391 392 chip->reg = chip->base; 393 pci_set_drvdata(pdev, chip); 394 mutex_init(&chip->lock); 395 pch_gpio_setup(chip); 396 ret = gpiochip_add(&chip->gpio); 397 if (ret) { 398 dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n"); 399 goto err_gpiochip_add; 400 } 401 402 irq_base = irq_alloc_descs(-1, 0, gpio_pins[chip->ioh], NUMA_NO_NODE); 403 if (irq_base < 0) { 404 dev_warn(&pdev->dev, "PCH gpio: Failed to get IRQ base num\n"); 405 chip->irq_base = -1; 406 goto end; 407 } 408 chip->irq_base = irq_base; 409 410 ret = request_irq(pdev->irq, pch_gpio_handler, 411 IRQF_SHARED, KBUILD_MODNAME, chip); 412 if (ret != 0) { 413 dev_err(&pdev->dev, 414 "%s request_irq failed\n", __func__); 415 goto err_request_irq; 416 } 417 418 pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]); 419 420 /* Initialize interrupt ien register */ 421 iowrite32(0, &chip->reg->ien); 422 end: 423 return 0; 424 425 err_request_irq: 426 irq_free_descs(irq_base, gpio_pins[chip->ioh]); 427 428 ret = gpiochip_remove(&chip->gpio); 429 if (ret) 430 dev_err(&pdev->dev, "%s gpiochip_remove failed\n", __func__); 431 432 err_gpiochip_add: 433 pci_iounmap(pdev, chip->base); 434 435 err_iomap: 436 pci_release_regions(pdev); 437 438 err_request_regions: 439 pci_disable_device(pdev); 440 441 err_pci_enable: 442 kfree(chip); 443 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret); 444 return ret; 445 } 446 447 static void __devexit pch_gpio_remove(struct pci_dev *pdev) 448 { 449 int err; 450 struct pch_gpio *chip = pci_get_drvdata(pdev); 451 452 if (chip->irq_base != -1) { 453 free_irq(pdev->irq, chip); 454 455 irq_free_descs(chip->irq_base, gpio_pins[chip->ioh]); 456 } 457 458 err = gpiochip_remove(&chip->gpio); 459 if (err) 460 dev_err(&pdev->dev, "Failed gpiochip_remove\n"); 461 462 pci_iounmap(pdev, chip->base); 463 pci_release_regions(pdev); 464 pci_disable_device(pdev); 465 kfree(chip); 466 } 467 468 #ifdef CONFIG_PM 469 static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state) 470 { 471 s32 ret; 472 struct pch_gpio *chip = pci_get_drvdata(pdev); 473 unsigned long flags; 474 475 spin_lock_irqsave(&chip->spinlock, flags); 476 pch_gpio_save_reg_conf(chip); 477 spin_unlock_irqrestore(&chip->spinlock, flags); 478 479 ret = pci_save_state(pdev); 480 if (ret) { 481 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret); 482 return ret; 483 } 484 pci_disable_device(pdev); 485 pci_set_power_state(pdev, PCI_D0); 486 ret = pci_enable_wake(pdev, PCI_D0, 1); 487 if (ret) 488 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret); 489 490 return 0; 491 } 492 493 static int pch_gpio_resume(struct pci_dev *pdev) 494 { 495 s32 ret; 496 struct pch_gpio *chip = pci_get_drvdata(pdev); 497 unsigned long flags; 498 499 ret = pci_enable_wake(pdev, PCI_D0, 0); 500 501 pci_set_power_state(pdev, PCI_D0); 502 ret = pci_enable_device(pdev); 503 if (ret) { 504 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret); 505 return ret; 506 } 507 pci_restore_state(pdev); 508 509 spin_lock_irqsave(&chip->spinlock, flags); 510 iowrite32(0x01, &chip->reg->reset); 511 iowrite32(0x00, &chip->reg->reset); 512 pch_gpio_restore_reg_conf(chip); 513 spin_unlock_irqrestore(&chip->spinlock, flags); 514 515 return 0; 516 } 517 #else 518 #define pch_gpio_suspend NULL 519 #define pch_gpio_resume NULL 520 #endif 521 522 #define PCI_VENDOR_ID_ROHM 0x10DB 523 static DEFINE_PCI_DEVICE_TABLE(pch_gpio_pcidev_id) = { 524 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) }, 525 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8014) }, 526 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8043) }, 527 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8803) }, 528 { 0, } 529 }; 530 MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id); 531 532 static struct pci_driver pch_gpio_driver = { 533 .name = "pch_gpio", 534 .id_table = pch_gpio_pcidev_id, 535 .probe = pch_gpio_probe, 536 .remove = __devexit_p(pch_gpio_remove), 537 .suspend = pch_gpio_suspend, 538 .resume = pch_gpio_resume 539 }; 540 541 static int __init pch_gpio_pci_init(void) 542 { 543 return pci_register_driver(&pch_gpio_driver); 544 } 545 module_init(pch_gpio_pci_init); 546 547 static void __exit pch_gpio_pci_exit(void) 548 { 549 pci_unregister_driver(&pch_gpio_driver); 550 } 551 module_exit(pch_gpio_pci_exit); 552 553 MODULE_DESCRIPTION("PCH GPIO PCI Driver"); 554 MODULE_LICENSE("GPL"); 555