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 96 */ 97 struct pch_gpio { 98 void __iomem *base; 99 struct pch_regs __iomem *reg; 100 struct device *dev; 101 struct gpio_chip gpio; 102 struct pch_gpio_reg_data pch_gpio_reg; 103 int irq_base; 104 enum pch_type_t ioh; 105 spinlock_t spinlock; 106 }; 107 108 static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val) 109 { 110 u32 reg_val; 111 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); 112 unsigned long flags; 113 114 spin_lock_irqsave(&chip->spinlock, flags); 115 reg_val = ioread32(&chip->reg->po); 116 if (val) 117 reg_val |= (1 << nr); 118 else 119 reg_val &= ~(1 << nr); 120 121 iowrite32(reg_val, &chip->reg->po); 122 spin_unlock_irqrestore(&chip->spinlock, flags); 123 } 124 125 static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr) 126 { 127 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); 128 129 return ioread32(&chip->reg->pi) & (1 << nr); 130 } 131 132 static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr, 133 int val) 134 { 135 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); 136 u32 pm; 137 u32 reg_val; 138 unsigned long flags; 139 140 spin_lock_irqsave(&chip->spinlock, flags); 141 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1); 142 pm |= (1 << nr); 143 iowrite32(pm, &chip->reg->pm); 144 145 reg_val = ioread32(&chip->reg->po); 146 if (val) 147 reg_val |= (1 << nr); 148 else 149 reg_val &= ~(1 << nr); 150 iowrite32(reg_val, &chip->reg->po); 151 spin_unlock_irqrestore(&chip->spinlock, flags); 152 153 return 0; 154 } 155 156 static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr) 157 { 158 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); 159 u32 pm; 160 unsigned long flags; 161 162 spin_lock_irqsave(&chip->spinlock, flags); 163 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1); 164 pm &= ~(1 << nr); 165 iowrite32(pm, &chip->reg->pm); 166 spin_unlock_irqrestore(&chip->spinlock, flags); 167 168 return 0; 169 } 170 171 /* 172 * Save register configuration and disable interrupts. 173 */ 174 static void pch_gpio_save_reg_conf(struct pch_gpio *chip) 175 { 176 chip->pch_gpio_reg.ien_reg = ioread32(&chip->reg->ien); 177 chip->pch_gpio_reg.imask_reg = ioread32(&chip->reg->imask); 178 chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po); 179 chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm); 180 chip->pch_gpio_reg.im0_reg = ioread32(&chip->reg->im0); 181 if (chip->ioh == INTEL_EG20T_PCH) 182 chip->pch_gpio_reg.im1_reg = ioread32(&chip->reg->im1); 183 if (chip->ioh == OKISEMI_ML7223n_IOH) 184 chip->pch_gpio_reg.gpio_use_sel_reg =\ 185 ioread32(&chip->reg->gpio_use_sel); 186 } 187 188 /* 189 * This function restores the register configuration of the GPIO device. 190 */ 191 static void pch_gpio_restore_reg_conf(struct pch_gpio *chip) 192 { 193 iowrite32(chip->pch_gpio_reg.ien_reg, &chip->reg->ien); 194 iowrite32(chip->pch_gpio_reg.imask_reg, &chip->reg->imask); 195 /* to store contents of PO register */ 196 iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po); 197 /* to store contents of PM register */ 198 iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm); 199 iowrite32(chip->pch_gpio_reg.im0_reg, &chip->reg->im0); 200 if (chip->ioh == INTEL_EG20T_PCH) 201 iowrite32(chip->pch_gpio_reg.im1_reg, &chip->reg->im1); 202 if (chip->ioh == OKISEMI_ML7223n_IOH) 203 iowrite32(chip->pch_gpio_reg.gpio_use_sel_reg, 204 &chip->reg->gpio_use_sel); 205 } 206 207 static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned offset) 208 { 209 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio); 210 return chip->irq_base + offset; 211 } 212 213 static void pch_gpio_setup(struct pch_gpio *chip) 214 { 215 struct gpio_chip *gpio = &chip->gpio; 216 217 gpio->label = dev_name(chip->dev); 218 gpio->dev = 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 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 234 struct pch_gpio *chip = gc->private; 235 u32 im, im_pos, val; 236 u32 __iomem *im_reg; 237 unsigned long flags; 238 int ch, irq = d->irq; 239 240 ch = irq - chip->irq_base; 241 if (irq <= chip->irq_base + 7) { 242 im_reg = &chip->reg->im0; 243 im_pos = ch; 244 } else { 245 im_reg = &chip->reg->im1; 246 im_pos = ch - 8; 247 } 248 dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d\n", 249 __func__, irq, type, ch, im_pos); 250 251 spin_lock_irqsave(&chip->spinlock, flags); 252 253 switch (type) { 254 case IRQ_TYPE_EDGE_RISING: 255 val = PCH_EDGE_RISING; 256 break; 257 case IRQ_TYPE_EDGE_FALLING: 258 val = PCH_EDGE_FALLING; 259 break; 260 case IRQ_TYPE_EDGE_BOTH: 261 val = PCH_EDGE_BOTH; 262 break; 263 case IRQ_TYPE_LEVEL_HIGH: 264 val = PCH_LEVEL_H; 265 break; 266 case IRQ_TYPE_LEVEL_LOW: 267 val = PCH_LEVEL_L; 268 break; 269 default: 270 goto unlock; 271 } 272 273 /* Set interrupt mode */ 274 im = ioread32(im_reg) & ~(PCH_IM_MASK << (im_pos * 4)); 275 iowrite32(im | (val << (im_pos * 4)), im_reg); 276 277 /* And the handler */ 278 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) 279 __irq_set_handler_locked(d->irq, handle_level_irq); 280 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) 281 __irq_set_handler_locked(d->irq, handle_edge_irq); 282 283 unlock: 284 spin_unlock_irqrestore(&chip->spinlock, flags); 285 return 0; 286 } 287 288 static void pch_irq_unmask(struct irq_data *d) 289 { 290 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 291 struct pch_gpio *chip = gc->private; 292 293 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imaskclr); 294 } 295 296 static void pch_irq_mask(struct irq_data *d) 297 { 298 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 299 struct pch_gpio *chip = gc->private; 300 301 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imask); 302 } 303 304 static void pch_irq_ack(struct irq_data *d) 305 { 306 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 307 struct pch_gpio *chip = gc->private; 308 309 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->iclr); 310 } 311 312 static irqreturn_t pch_gpio_handler(int irq, void *dev_id) 313 { 314 struct pch_gpio *chip = dev_id; 315 u32 reg_val = ioread32(&chip->reg->istatus); 316 int i, ret = IRQ_NONE; 317 318 for (i = 0; i < gpio_pins[chip->ioh]; i++) { 319 if (reg_val & BIT(i)) { 320 dev_dbg(chip->dev, "%s:[%d]:irq=%d status=0x%x\n", 321 __func__, i, irq, reg_val); 322 generic_handle_irq(chip->irq_base + i); 323 ret = IRQ_HANDLED; 324 } 325 } 326 return ret; 327 } 328 329 static void pch_gpio_alloc_generic_chip(struct pch_gpio *chip, 330 unsigned int irq_start, unsigned int num) 331 { 332 struct irq_chip_generic *gc; 333 struct irq_chip_type *ct; 334 335 gc = irq_alloc_generic_chip("pch_gpio", 1, irq_start, chip->base, 336 handle_simple_irq); 337 gc->private = chip; 338 ct = gc->chip_types; 339 340 ct->chip.irq_ack = pch_irq_ack; 341 ct->chip.irq_mask = pch_irq_mask; 342 ct->chip.irq_unmask = pch_irq_unmask; 343 ct->chip.irq_set_type = pch_irq_type; 344 345 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, 346 IRQ_NOREQUEST | IRQ_NOPROBE, 0); 347 } 348 349 static int pch_gpio_probe(struct pci_dev *pdev, 350 const struct pci_device_id *id) 351 { 352 s32 ret; 353 struct pch_gpio *chip; 354 int irq_base; 355 u32 msk; 356 357 chip = kzalloc(sizeof(*chip), GFP_KERNEL); 358 if (chip == NULL) 359 return -ENOMEM; 360 361 chip->dev = &pdev->dev; 362 ret = pci_enable_device(pdev); 363 if (ret) { 364 dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__); 365 goto err_pci_enable; 366 } 367 368 ret = pci_request_regions(pdev, KBUILD_MODNAME); 369 if (ret) { 370 dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret); 371 goto err_request_regions; 372 } 373 374 chip->base = pci_iomap(pdev, 1, 0); 375 if (!chip->base) { 376 dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__); 377 ret = -ENOMEM; 378 goto err_iomap; 379 } 380 381 if (pdev->device == 0x8803) 382 chip->ioh = INTEL_EG20T_PCH; 383 else if (pdev->device == 0x8014) 384 chip->ioh = OKISEMI_ML7223m_IOH; 385 else if (pdev->device == 0x8043) 386 chip->ioh = OKISEMI_ML7223n_IOH; 387 388 chip->reg = chip->base; 389 pci_set_drvdata(pdev, chip); 390 spin_lock_init(&chip->spinlock); 391 pch_gpio_setup(chip); 392 ret = gpiochip_add(&chip->gpio); 393 if (ret) { 394 dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n"); 395 goto err_gpiochip_add; 396 } 397 398 irq_base = irq_alloc_descs(-1, 0, gpio_pins[chip->ioh], NUMA_NO_NODE); 399 if (irq_base < 0) { 400 dev_warn(&pdev->dev, "PCH gpio: Failed to get IRQ base num\n"); 401 chip->irq_base = -1; 402 goto end; 403 } 404 chip->irq_base = irq_base; 405 406 /* Mask all interrupts, but enable them */ 407 msk = (1 << gpio_pins[chip->ioh]) - 1; 408 iowrite32(msk, &chip->reg->imask); 409 iowrite32(msk, &chip->reg->ien); 410 411 ret = request_irq(pdev->irq, pch_gpio_handler, 412 IRQF_SHARED, KBUILD_MODNAME, chip); 413 if (ret != 0) { 414 dev_err(&pdev->dev, 415 "%s request_irq failed\n", __func__); 416 goto err_request_irq; 417 } 418 419 pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]); 420 421 end: 422 return 0; 423 424 err_request_irq: 425 irq_free_descs(irq_base, gpio_pins[chip->ioh]); 426 427 if (gpiochip_remove(&chip->gpio)) 428 dev_err(&pdev->dev, "%s gpiochip_remove failed\n", __func__); 429 430 err_gpiochip_add: 431 pci_iounmap(pdev, chip->base); 432 433 err_iomap: 434 pci_release_regions(pdev); 435 436 err_request_regions: 437 pci_disable_device(pdev); 438 439 err_pci_enable: 440 kfree(chip); 441 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret); 442 return ret; 443 } 444 445 static void pch_gpio_remove(struct pci_dev *pdev) 446 { 447 int err; 448 struct pch_gpio *chip = pci_get_drvdata(pdev); 449 450 if (chip->irq_base != -1) { 451 free_irq(pdev->irq, chip); 452 453 irq_free_descs(chip->irq_base, gpio_pins[chip->ioh]); 454 } 455 456 err = gpiochip_remove(&chip->gpio); 457 if (err) 458 dev_err(&pdev->dev, "Failed gpiochip_remove\n"); 459 460 pci_iounmap(pdev, chip->base); 461 pci_release_regions(pdev); 462 pci_disable_device(pdev); 463 kfree(chip); 464 } 465 466 #ifdef CONFIG_PM 467 static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state) 468 { 469 s32 ret; 470 struct pch_gpio *chip = pci_get_drvdata(pdev); 471 unsigned long flags; 472 473 spin_lock_irqsave(&chip->spinlock, flags); 474 pch_gpio_save_reg_conf(chip); 475 spin_unlock_irqrestore(&chip->spinlock, flags); 476 477 ret = pci_save_state(pdev); 478 if (ret) { 479 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret); 480 return ret; 481 } 482 pci_disable_device(pdev); 483 pci_set_power_state(pdev, PCI_D0); 484 ret = pci_enable_wake(pdev, PCI_D0, 1); 485 if (ret) 486 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret); 487 488 return 0; 489 } 490 491 static int pch_gpio_resume(struct pci_dev *pdev) 492 { 493 s32 ret; 494 struct pch_gpio *chip = pci_get_drvdata(pdev); 495 unsigned long flags; 496 497 ret = pci_enable_wake(pdev, PCI_D0, 0); 498 499 pci_set_power_state(pdev, PCI_D0); 500 ret = pci_enable_device(pdev); 501 if (ret) { 502 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret); 503 return ret; 504 } 505 pci_restore_state(pdev); 506 507 spin_lock_irqsave(&chip->spinlock, flags); 508 iowrite32(0x01, &chip->reg->reset); 509 iowrite32(0x00, &chip->reg->reset); 510 pch_gpio_restore_reg_conf(chip); 511 spin_unlock_irqrestore(&chip->spinlock, flags); 512 513 return 0; 514 } 515 #else 516 #define pch_gpio_suspend NULL 517 #define pch_gpio_resume NULL 518 #endif 519 520 #define PCI_VENDOR_ID_ROHM 0x10DB 521 static DEFINE_PCI_DEVICE_TABLE(pch_gpio_pcidev_id) = { 522 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) }, 523 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8014) }, 524 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8043) }, 525 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8803) }, 526 { 0, } 527 }; 528 MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id); 529 530 static struct pci_driver pch_gpio_driver = { 531 .name = "pch_gpio", 532 .id_table = pch_gpio_pcidev_id, 533 .probe = pch_gpio_probe, 534 .remove = pch_gpio_remove, 535 .suspend = pch_gpio_suspend, 536 .resume = pch_gpio_resume 537 }; 538 539 module_pci_driver(pch_gpio_driver); 540 541 MODULE_DESCRIPTION("PCH GPIO PCI Driver"); 542 MODULE_LICENSE("GPL"); 543