2 * Intel MID GPIO driver
4 * Copyright (c) 2008-2014 Intel Corporation.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
17 * Moorestown platform Langwell chip.
18 * Medfield platform Penwell chip.
19 * Clovertrail platform Cloverview chip.
20 * Merrifield platform Tangier chip.
23 #include <linux/module.h>
24 #include <linux/pci.h>
25 #include <linux/platform_device.h>
26 #include <linux/kernel.h>
27 #include <linux/delay.h>
28 #include <linux/stddef.h>
29 #include <linux/interrupt.h>
30 #include <linux/init.h>
31 #include <linux/irq.h>
33 #include <linux/gpio.h>
34 #include <linux/slab.h>
35 #include <linux/pm_runtime.h>
36 #include <linux/irqdomain.h>
38 #define INTEL_MID_IRQ_TYPE_EDGE (1 << 0)
39 #define INTEL_MID_IRQ_TYPE_LEVEL (1 << 1)
42 * Langwell chip has 64 pins and thus there are 2 32bit registers to control
43 * each feature, while Penwell chip has 96 pins for each block, and need 3 32bit
44 * registers to control them, so we only define the order here instead of a
45 * structure, to get a bit offset for a pin (use GPDR as an example):
50 * reg_addr = reg_base + GPDR * nreg * 4 + reg * 4;
52 * so the bit of reg_addr is to control pin offset's GPDR feature
56 GPLR = 0, /* pin level read-only */
57 GPDR, /* pin direction */
60 GRER, /* rising edge detect */
61 GFER, /* falling edge detect */
62 GEDR, /* edge detect result */
63 GAFR, /* alt function */
66 /* intel_mid gpio driver data */
67 struct intel_mid_gpio_ddata {
68 u16 ngpio; /* number of gpio pins */
69 u32 gplr_offset; /* offset of first GPLR register from base */
70 u32 flis_base; /* base address of FLIS registers */
71 u32 flis_len; /* length of FLIS registers */
72 u32 (*get_flis_offset)(int gpio);
73 u32 chip_irq_type; /* chip interrupt type */
76 struct intel_mid_gpio {
77 struct gpio_chip chip;
78 void __iomem *reg_base;
81 struct irq_domain *domain;
84 #define to_intel_gpio_priv(chip) container_of(chip, struct intel_mid_gpio, chip)
86 static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset,
87 enum GPIO_REG reg_type)
89 struct intel_mid_gpio *priv = to_intel_gpio_priv(chip);
90 unsigned nreg = chip->ngpio / 32;
93 return priv->reg_base + reg_type * nreg * 4 + reg * 4;
96 static void __iomem *gpio_reg_2bit(struct gpio_chip *chip, unsigned offset,
97 enum GPIO_REG reg_type)
99 struct intel_mid_gpio *priv = to_intel_gpio_priv(chip);
100 unsigned nreg = chip->ngpio / 32;
101 u8 reg = offset / 16;
103 return priv->reg_base + reg_type * nreg * 4 + reg * 4;
106 static int intel_gpio_request(struct gpio_chip *chip, unsigned offset)
108 void __iomem *gafr = gpio_reg_2bit(chip, offset, GAFR);
109 u32 value = readl(gafr);
110 int shift = (offset % 16) << 1, af = (value >> shift) & 3;
113 value &= ~(3 << shift);
119 static int intel_gpio_get(struct gpio_chip *chip, unsigned offset)
121 void __iomem *gplr = gpio_reg(chip, offset, GPLR);
123 return readl(gplr) & BIT(offset % 32);
126 static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
128 void __iomem *gpsr, *gpcr;
131 gpsr = gpio_reg(chip, offset, GPSR);
132 writel(BIT(offset % 32), gpsr);
134 gpcr = gpio_reg(chip, offset, GPCR);
135 writel(BIT(offset % 32), gpcr);
139 static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
141 struct intel_mid_gpio *priv = to_intel_gpio_priv(chip);
142 void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
147 pm_runtime_get(&priv->pdev->dev);
149 spin_lock_irqsave(&priv->lock, flags);
151 value &= ~BIT(offset % 32);
153 spin_unlock_irqrestore(&priv->lock, flags);
156 pm_runtime_put(&priv->pdev->dev);
161 static int intel_gpio_direction_output(struct gpio_chip *chip,
162 unsigned offset, int value)
164 struct intel_mid_gpio *priv = to_intel_gpio_priv(chip);
165 void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
168 intel_gpio_set(chip, offset, value);
171 pm_runtime_get(&priv->pdev->dev);
173 spin_lock_irqsave(&priv->lock, flags);
175 value |= BIT(offset % 32);
177 spin_unlock_irqrestore(&priv->lock, flags);
180 pm_runtime_put(&priv->pdev->dev);
185 static int intel_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
187 struct intel_mid_gpio *priv = to_intel_gpio_priv(chip);
188 return irq_create_mapping(priv->domain, offset);
191 static int intel_mid_irq_type(struct irq_data *d, unsigned type)
193 struct intel_mid_gpio *priv = irq_data_get_irq_chip_data(d);
194 u32 gpio = irqd_to_hwirq(d);
197 void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER);
198 void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER);
200 if (gpio >= priv->chip.ngpio)
204 pm_runtime_get(&priv->pdev->dev);
206 spin_lock_irqsave(&priv->lock, flags);
207 if (type & IRQ_TYPE_EDGE_RISING)
208 value = readl(grer) | BIT(gpio % 32);
210 value = readl(grer) & (~BIT(gpio % 32));
213 if (type & IRQ_TYPE_EDGE_FALLING)
214 value = readl(gfer) | BIT(gpio % 32);
216 value = readl(gfer) & (~BIT(gpio % 32));
218 spin_unlock_irqrestore(&priv->lock, flags);
221 pm_runtime_put(&priv->pdev->dev);
226 static void intel_mid_irq_unmask(struct irq_data *d)
230 static void intel_mid_irq_mask(struct irq_data *d)
234 static int intel_mid_irq_reqres(struct irq_data *d)
236 struct intel_mid_gpio *priv = irq_data_get_irq_chip_data(d);
238 if (gpio_lock_as_irq(&priv->chip, irqd_to_hwirq(d))) {
239 dev_err(priv->chip.dev,
240 "unable to lock HW IRQ %lu for IRQ\n",
247 static void intel_mid_irq_relres(struct irq_data *d)
249 struct intel_mid_gpio *priv = irq_data_get_irq_chip_data(d);
251 gpio_unlock_as_irq(&priv->chip, irqd_to_hwirq(d));
254 static struct irq_chip intel_mid_irqchip = {
255 .name = "INTEL_MID-GPIO",
256 .irq_mask = intel_mid_irq_mask,
257 .irq_unmask = intel_mid_irq_unmask,
258 .irq_set_type = intel_mid_irq_type,
259 .irq_request_resources = intel_mid_irq_reqres,
260 .irq_release_resources = intel_mid_irq_relres,
263 static const struct intel_mid_gpio_ddata gpio_lincroft = {
267 static const struct intel_mid_gpio_ddata gpio_penwell_aon = {
269 .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
272 static const struct intel_mid_gpio_ddata gpio_penwell_core = {
274 .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
277 static const struct intel_mid_gpio_ddata gpio_cloverview_aon = {
279 .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE | INTEL_MID_IRQ_TYPE_LEVEL,
282 static const struct intel_mid_gpio_ddata gpio_cloverview_core = {
284 .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
287 static const struct intel_mid_gpio_ddata gpio_tangier = {
290 .flis_base = 0xff0c0000,
292 .get_flis_offset = NULL,
293 .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
296 static const struct pci_device_id intel_gpio_ids[] = {
299 PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f),
300 .driver_data = (kernel_ulong_t)&gpio_lincroft,
304 PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081f),
305 .driver_data = (kernel_ulong_t)&gpio_penwell_aon,
309 PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081a),
310 .driver_data = (kernel_ulong_t)&gpio_penwell_core,
314 PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08eb),
315 .driver_data = (kernel_ulong_t)&gpio_cloverview_aon,
318 /* Cloverview Core */
319 PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08f7),
320 .driver_data = (kernel_ulong_t)&gpio_cloverview_core,
324 PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x1199),
325 .driver_data = (kernel_ulong_t)&gpio_tangier,
329 MODULE_DEVICE_TABLE(pci, intel_gpio_ids);
331 static void intel_mid_irq_handler(unsigned irq, struct irq_desc *desc)
333 struct irq_data *data = irq_desc_get_irq_data(desc);
334 struct intel_mid_gpio *priv = irq_data_get_irq_handler_data(data);
335 struct irq_chip *chip = irq_data_get_irq_chip(data);
336 u32 base, gpio, mask;
337 unsigned long pending;
340 /* check GPIO controller to check which pin triggered the interrupt */
341 for (base = 0; base < priv->chip.ngpio; base += 32) {
342 gedr = gpio_reg(&priv->chip, base, GEDR);
343 while ((pending = readl(gedr))) {
344 gpio = __ffs(pending);
346 /* Clear before handling so we can't lose an edge */
348 generic_handle_irq(irq_find_mapping(priv->domain,
356 static void intel_mid_irq_init_hw(struct intel_mid_gpio *priv)
361 for (base = 0; base < priv->chip.ngpio; base += 32) {
362 /* Clear the rising-edge detect register */
363 reg = gpio_reg(&priv->chip, base, GRER);
365 /* Clear the falling-edge detect register */
366 reg = gpio_reg(&priv->chip, base, GFER);
368 /* Clear the edge detect status register */
369 reg = gpio_reg(&priv->chip, base, GEDR);
374 static int intel_gpio_irq_map(struct irq_domain *d, unsigned int irq,
375 irq_hw_number_t hwirq)
377 struct intel_mid_gpio *priv = d->host_data;
379 irq_set_chip_and_handler(irq, &intel_mid_irqchip, handle_simple_irq);
380 irq_set_chip_data(irq, priv);
381 irq_set_irq_type(irq, IRQ_TYPE_NONE);
386 static const struct irq_domain_ops intel_gpio_irq_ops = {
387 .map = intel_gpio_irq_map,
388 .xlate = irq_domain_xlate_twocell,
391 static int intel_gpio_runtime_idle(struct device *dev)
393 int err = pm_schedule_suspend(dev, 500);
394 return err ?: -EBUSY;
397 static const struct dev_pm_ops intel_gpio_pm_ops = {
398 SET_RUNTIME_PM_OPS(NULL, NULL, intel_gpio_runtime_idle)
401 static int intel_gpio_probe(struct pci_dev *pdev,
402 const struct pci_device_id *id)
405 struct intel_mid_gpio *priv;
409 struct intel_mid_gpio_ddata *ddata =
410 (struct intel_mid_gpio_ddata *)id->driver_data;
412 retval = pcim_enable_device(pdev);
416 retval = pcim_iomap_regions(pdev, 1 << 0 | 1 << 1, pci_name(pdev));
418 dev_err(&pdev->dev, "I/O memory mapping error\n");
422 base = pcim_iomap_table(pdev)[1];
424 irq_base = readl(base);
425 gpio_base = readl(sizeof(u32) + base);
427 /* release the IO mapping, since we already get the info from bar1 */
428 pcim_iounmap_regions(pdev, 1 << 1);
430 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
432 dev_err(&pdev->dev, "can't allocate chip data\n");
436 priv->reg_base = pcim_iomap_table(pdev)[0];
437 priv->chip.label = dev_name(&pdev->dev);
438 priv->chip.dev = &pdev->dev;
439 priv->chip.request = intel_gpio_request;
440 priv->chip.direction_input = intel_gpio_direction_input;
441 priv->chip.direction_output = intel_gpio_direction_output;
442 priv->chip.get = intel_gpio_get;
443 priv->chip.set = intel_gpio_set;
444 priv->chip.to_irq = intel_gpio_to_irq;
445 priv->chip.base = gpio_base;
446 priv->chip.ngpio = ddata->ngpio;
447 priv->chip.can_sleep = false;
450 spin_lock_init(&priv->lock);
452 priv->domain = irq_domain_add_simple(pdev->dev.of_node, ddata->ngpio,
453 irq_base, &intel_gpio_irq_ops, priv);
457 pci_set_drvdata(pdev, priv);
458 retval = gpiochip_add(&priv->chip);
460 dev_err(&pdev->dev, "gpiochip_add error %d\n", retval);
464 intel_mid_irq_init_hw(priv);
466 irq_set_handler_data(pdev->irq, priv);
467 irq_set_chained_handler(pdev->irq, intel_mid_irq_handler);
469 pm_runtime_put_noidle(&pdev->dev);
470 pm_runtime_allow(&pdev->dev);
475 static struct pci_driver intel_gpio_driver = {
476 .name = "intel_mid_gpio",
477 .id_table = intel_gpio_ids,
478 .probe = intel_gpio_probe,
480 .pm = &intel_gpio_pm_ops,
484 static int __init intel_gpio_init(void)
486 return pci_register_driver(&intel_gpio_driver);
489 device_initcall(intel_gpio_init);