2 * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
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.
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.
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.
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>
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))
32 #define PCH_IRQ_BASE 24
53 OKISEMI_ML7223m_IOH, /* LAPIS Semiconductor ML7223 IOH PCIe Bus-m */
54 OKISEMI_ML7223n_IOH /* LAPIS Semiconductor ML7223 IOH PCIe Bus-n */
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,
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.
75 struct pch_gpio_reg_data {
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
93 * @lock: Used for register access protection
94 * @irq_base: Save base of IRQ number for interrupt
96 * @spinlock: Used for register access protection
100 struct pch_regs __iomem *reg;
102 struct gpio_chip gpio;
103 struct pch_gpio_reg_data pch_gpio_reg;
109 static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
112 struct pch_gpio *chip = gpiochip_get_data(gpio);
115 spin_lock_irqsave(&chip->spinlock, flags);
116 reg_val = ioread32(&chip->reg->po);
118 reg_val |= (1 << nr);
120 reg_val &= ~(1 << nr);
122 iowrite32(reg_val, &chip->reg->po);
123 spin_unlock_irqrestore(&chip->spinlock, flags);
126 static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
128 struct pch_gpio *chip = gpiochip_get_data(gpio);
130 return (ioread32(&chip->reg->pi) >> nr) & 1;
133 static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
136 struct pch_gpio *chip = gpiochip_get_data(gpio);
141 spin_lock_irqsave(&chip->spinlock, flags);
143 reg_val = ioread32(&chip->reg->po);
145 reg_val |= (1 << nr);
147 reg_val &= ~(1 << nr);
148 iowrite32(reg_val, &chip->reg->po);
150 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
152 iowrite32(pm, &chip->reg->pm);
154 spin_unlock_irqrestore(&chip->spinlock, flags);
159 static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
161 struct pch_gpio *chip = gpiochip_get_data(gpio);
165 spin_lock_irqsave(&chip->spinlock, flags);
166 pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
168 iowrite32(pm, &chip->reg->pm);
169 spin_unlock_irqrestore(&chip->spinlock, flags);
176 * Save register configuration and disable interrupts.
178 static void pch_gpio_save_reg_conf(struct pch_gpio *chip)
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);
193 * This function restores the register configuration of the GPIO device.
195 static void pch_gpio_restore_reg_conf(struct pch_gpio *chip)
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);
212 static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
214 struct pch_gpio *chip = gpiochip_get_data(gpio);
215 return chip->irq_base + offset;
218 static void pch_gpio_setup(struct pch_gpio *chip)
220 struct gpio_chip *gpio = &chip->gpio;
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;
231 gpio->ngpio = gpio_pins[chip->ioh];
232 gpio->can_sleep = false;
233 gpio->to_irq = pch_gpio_to_irq;
236 static int pch_irq_type(struct irq_data *d, unsigned int type)
238 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
239 struct pch_gpio *chip = gc->private;
243 int ch, irq = d->irq;
245 ch = irq - chip->irq_base;
246 if (irq <= chip->irq_base + 7) {
247 im_reg = &chip->reg->im0;
250 im_reg = &chip->reg->im1;
253 dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d\n",
254 __func__, irq, type, ch, im_pos);
256 spin_lock_irqsave(&chip->spinlock, flags);
259 case IRQ_TYPE_EDGE_RISING:
260 val = PCH_EDGE_RISING;
262 case IRQ_TYPE_EDGE_FALLING:
263 val = PCH_EDGE_FALLING;
265 case IRQ_TYPE_EDGE_BOTH:
268 case IRQ_TYPE_LEVEL_HIGH:
271 case IRQ_TYPE_LEVEL_LOW:
278 /* Set interrupt mode */
279 im = ioread32(im_reg) & ~(PCH_IM_MASK << (im_pos * 4));
280 iowrite32(im | (val << (im_pos * 4)), im_reg);
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);
289 spin_unlock_irqrestore(&chip->spinlock, flags);
293 static void pch_irq_unmask(struct irq_data *d)
295 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
296 struct pch_gpio *chip = gc->private;
298 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imaskclr);
301 static void pch_irq_mask(struct irq_data *d)
303 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
304 struct pch_gpio *chip = gc->private;
306 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imask);
309 static void pch_irq_ack(struct irq_data *d)
311 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
312 struct pch_gpio *chip = gc->private;
314 iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->iclr);
317 static irqreturn_t pch_gpio_handler(int irq, void *dev_id)
319 struct pch_gpio *chip = dev_id;
320 u32 reg_val = ioread32(&chip->reg->istatus);
321 int i, ret = IRQ_NONE;
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);
334 static int pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
335 unsigned int irq_start,
338 struct irq_chip_generic *gc;
339 struct irq_chip_type *ct;
341 gc = irq_alloc_generic_chip("pch_gpio", 1, irq_start, chip->base,
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;
354 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
355 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
360 static int pch_gpio_probe(struct pci_dev *pdev,
361 const struct pci_device_id *id)
364 struct pch_gpio *chip;
368 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
372 chip->dev = &pdev->dev;
373 ret = pci_enable_device(pdev);
375 dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__);
379 ret = pci_request_regions(pdev, KBUILD_MODNAME);
381 dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
382 goto err_request_regions;
385 chip->base = pci_iomap(pdev, 1, 0);
387 dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__);
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;
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;
406 ret = gpiochip_add_data(&chip->gpio, chip);
408 dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
409 goto err_gpiochip_add;
412 irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0,
413 gpio_pins[chip->ioh], NUMA_NO_NODE);
415 dev_warn(&pdev->dev, "PCH gpio: Failed to get IRQ base num\n");
419 chip->irq_base = irq_base;
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);
426 ret = devm_request_irq(&pdev->dev, pdev->irq, pch_gpio_handler,
427 IRQF_SHARED, KBUILD_MODNAME, chip);
430 "%s request_irq failed\n", __func__);
431 goto err_request_irq;
434 ret = pch_gpio_alloc_generic_chip(chip, irq_base,
435 gpio_pins[chip->ioh]);
437 goto err_request_irq;
443 gpiochip_remove(&chip->gpio);
446 pci_iounmap(pdev, chip->base);
449 pci_release_regions(pdev);
452 pci_disable_device(pdev);
456 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
460 static void pch_gpio_remove(struct pci_dev *pdev)
462 struct pch_gpio *chip = pci_get_drvdata(pdev);
464 gpiochip_remove(&chip->gpio);
465 pci_iounmap(pdev, chip->base);
466 pci_release_regions(pdev);
467 pci_disable_device(pdev);
472 static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
475 struct pch_gpio *chip = pci_get_drvdata(pdev);
478 spin_lock_irqsave(&chip->spinlock, flags);
479 pch_gpio_save_reg_conf(chip);
480 spin_unlock_irqrestore(&chip->spinlock, flags);
482 ret = pci_save_state(pdev);
484 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
487 pci_disable_device(pdev);
488 pci_set_power_state(pdev, PCI_D0);
489 ret = pci_enable_wake(pdev, PCI_D0, 1);
491 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
496 static int pch_gpio_resume(struct pci_dev *pdev)
499 struct pch_gpio *chip = pci_get_drvdata(pdev);
502 ret = pci_enable_wake(pdev, PCI_D0, 0);
504 pci_set_power_state(pdev, PCI_D0);
505 ret = pci_enable_device(pdev);
507 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
510 pci_restore_state(pdev);
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);
521 #define pch_gpio_suspend NULL
522 #define pch_gpio_resume NULL
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) },
533 MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id);
535 static struct pci_driver pch_gpio_driver = {
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
544 module_pci_driver(pch_gpio_driver);
546 MODULE_DESCRIPTION("PCH GPIO PCI Driver");
547 MODULE_LICENSE("GPL");