Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / gpio / gpio-intel-mid.c
blob86a10c808ef658c84a1218ccbd7b11e3712197fb
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Intel MID GPIO driver
5 * Copyright (c) 2008-2014,2016 Intel Corporation.
6 */
8 /* Supports:
9 * Moorestown platform Langwell chip.
10 * Medfield platform Penwell chip.
11 * Clovertrail platform Cloverview chip.
14 #include <linux/delay.h>
15 #include <linux/gpio/driver.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/io.h>
19 #include <linux/kernel.h>
20 #include <linux/pci.h>
21 #include <linux/platform_device.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/slab.h>
24 #include <linux/stddef.h>
26 #define INTEL_MID_IRQ_TYPE_EDGE (1 << 0)
27 #define INTEL_MID_IRQ_TYPE_LEVEL (1 << 1)
30 * Langwell chip has 64 pins and thus there are 2 32bit registers to control
31 * each feature, while Penwell chip has 96 pins for each block, and need 3 32bit
32 * registers to control them, so we only define the order here instead of a
33 * structure, to get a bit offset for a pin (use GPDR as an example):
35 * nreg = ngpio / 32;
36 * reg = offset / 32;
37 * bit = offset % 32;
38 * reg_addr = reg_base + GPDR * nreg * 4 + reg * 4;
40 * so the bit of reg_addr is to control pin offset's GPDR feature
43 enum GPIO_REG {
44 GPLR = 0, /* pin level read-only */
45 GPDR, /* pin direction */
46 GPSR, /* pin set */
47 GPCR, /* pin clear */
48 GRER, /* rising edge detect */
49 GFER, /* falling edge detect */
50 GEDR, /* edge detect result */
51 GAFR, /* alt function */
54 /* intel_mid gpio driver data */
55 struct intel_mid_gpio_ddata {
56 u16 ngpio; /* number of gpio pins */
57 u32 chip_irq_type; /* chip interrupt type */
60 struct intel_mid_gpio {
61 struct gpio_chip chip;
62 void __iomem *reg_base;
63 spinlock_t lock;
64 struct pci_dev *pdev;
67 static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset,
68 enum GPIO_REG reg_type)
70 struct intel_mid_gpio *priv = gpiochip_get_data(chip);
71 unsigned nreg = chip->ngpio / 32;
72 u8 reg = offset / 32;
74 return priv->reg_base + reg_type * nreg * 4 + reg * 4;
77 static void __iomem *gpio_reg_2bit(struct gpio_chip *chip, unsigned offset,
78 enum GPIO_REG reg_type)
80 struct intel_mid_gpio *priv = gpiochip_get_data(chip);
81 unsigned nreg = chip->ngpio / 32;
82 u8 reg = offset / 16;
84 return priv->reg_base + reg_type * nreg * 4 + reg * 4;
87 static int intel_gpio_request(struct gpio_chip *chip, unsigned offset)
89 void __iomem *gafr = gpio_reg_2bit(chip, offset, GAFR);
90 u32 value = readl(gafr);
91 int shift = (offset % 16) << 1, af = (value >> shift) & 3;
93 if (af) {
94 value &= ~(3 << shift);
95 writel(value, gafr);
97 return 0;
100 static int intel_gpio_get(struct gpio_chip *chip, unsigned offset)
102 void __iomem *gplr = gpio_reg(chip, offset, GPLR);
104 return !!(readl(gplr) & BIT(offset % 32));
107 static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
109 void __iomem *gpsr, *gpcr;
111 if (value) {
112 gpsr = gpio_reg(chip, offset, GPSR);
113 writel(BIT(offset % 32), gpsr);
114 } else {
115 gpcr = gpio_reg(chip, offset, GPCR);
116 writel(BIT(offset % 32), gpcr);
120 static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
122 struct intel_mid_gpio *priv = gpiochip_get_data(chip);
123 void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
124 u32 value;
125 unsigned long flags;
127 if (priv->pdev)
128 pm_runtime_get(&priv->pdev->dev);
130 spin_lock_irqsave(&priv->lock, flags);
131 value = readl(gpdr);
132 value &= ~BIT(offset % 32);
133 writel(value, gpdr);
134 spin_unlock_irqrestore(&priv->lock, flags);
136 if (priv->pdev)
137 pm_runtime_put(&priv->pdev->dev);
139 return 0;
142 static int intel_gpio_direction_output(struct gpio_chip *chip,
143 unsigned offset, int value)
145 struct intel_mid_gpio *priv = gpiochip_get_data(chip);
146 void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
147 unsigned long flags;
149 intel_gpio_set(chip, offset, value);
151 if (priv->pdev)
152 pm_runtime_get(&priv->pdev->dev);
154 spin_lock_irqsave(&priv->lock, flags);
155 value = readl(gpdr);
156 value |= BIT(offset % 32);
157 writel(value, gpdr);
158 spin_unlock_irqrestore(&priv->lock, flags);
160 if (priv->pdev)
161 pm_runtime_put(&priv->pdev->dev);
163 return 0;
166 static int intel_mid_irq_type(struct irq_data *d, unsigned type)
168 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
169 struct intel_mid_gpio *priv = gpiochip_get_data(gc);
170 u32 gpio = irqd_to_hwirq(d);
171 unsigned long flags;
172 u32 value;
173 void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER);
174 void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER);
176 if (gpio >= priv->chip.ngpio)
177 return -EINVAL;
179 if (priv->pdev)
180 pm_runtime_get(&priv->pdev->dev);
182 spin_lock_irqsave(&priv->lock, flags);
183 if (type & IRQ_TYPE_EDGE_RISING)
184 value = readl(grer) | BIT(gpio % 32);
185 else
186 value = readl(grer) & (~BIT(gpio % 32));
187 writel(value, grer);
189 if (type & IRQ_TYPE_EDGE_FALLING)
190 value = readl(gfer) | BIT(gpio % 32);
191 else
192 value = readl(gfer) & (~BIT(gpio % 32));
193 writel(value, gfer);
194 spin_unlock_irqrestore(&priv->lock, flags);
196 if (priv->pdev)
197 pm_runtime_put(&priv->pdev->dev);
199 return 0;
202 static void intel_mid_irq_unmask(struct irq_data *d)
206 static void intel_mid_irq_mask(struct irq_data *d)
210 static struct irq_chip intel_mid_irqchip = {
211 .name = "INTEL_MID-GPIO",
212 .irq_mask = intel_mid_irq_mask,
213 .irq_unmask = intel_mid_irq_unmask,
214 .irq_set_type = intel_mid_irq_type,
217 static const struct intel_mid_gpio_ddata gpio_lincroft = {
218 .ngpio = 64,
221 static const struct intel_mid_gpio_ddata gpio_penwell_aon = {
222 .ngpio = 96,
223 .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
226 static const struct intel_mid_gpio_ddata gpio_penwell_core = {
227 .ngpio = 96,
228 .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
231 static const struct intel_mid_gpio_ddata gpio_cloverview_aon = {
232 .ngpio = 96,
233 .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE | INTEL_MID_IRQ_TYPE_LEVEL,
236 static const struct intel_mid_gpio_ddata gpio_cloverview_core = {
237 .ngpio = 96,
238 .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
241 static const struct pci_device_id intel_gpio_ids[] = {
243 /* Lincroft */
244 PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f),
245 .driver_data = (kernel_ulong_t)&gpio_lincroft,
248 /* Penwell AON */
249 PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081f),
250 .driver_data = (kernel_ulong_t)&gpio_penwell_aon,
253 /* Penwell Core */
254 PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081a),
255 .driver_data = (kernel_ulong_t)&gpio_penwell_core,
258 /* Cloverview Aon */
259 PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08eb),
260 .driver_data = (kernel_ulong_t)&gpio_cloverview_aon,
263 /* Cloverview Core */
264 PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08f7),
265 .driver_data = (kernel_ulong_t)&gpio_cloverview_core,
270 static void intel_mid_irq_handler(struct irq_desc *desc)
272 struct gpio_chip *gc = irq_desc_get_handler_data(desc);
273 struct intel_mid_gpio *priv = gpiochip_get_data(gc);
274 struct irq_data *data = irq_desc_get_irq_data(desc);
275 struct irq_chip *chip = irq_data_get_irq_chip(data);
276 u32 base, gpio, mask;
277 unsigned long pending;
278 void __iomem *gedr;
280 /* check GPIO controller to check which pin triggered the interrupt */
281 for (base = 0; base < priv->chip.ngpio; base += 32) {
282 gedr = gpio_reg(&priv->chip, base, GEDR);
283 while ((pending = readl(gedr))) {
284 gpio = __ffs(pending);
285 mask = BIT(gpio);
286 /* Clear before handling so we can't lose an edge */
287 writel(mask, gedr);
288 generic_handle_irq(irq_find_mapping(gc->irq.domain,
289 base + gpio));
293 chip->irq_eoi(data);
296 static int intel_mid_irq_init_hw(struct gpio_chip *chip)
298 struct intel_mid_gpio *priv = gpiochip_get_data(chip);
299 void __iomem *reg;
300 unsigned base;
302 for (base = 0; base < priv->chip.ngpio; base += 32) {
303 /* Clear the rising-edge detect register */
304 reg = gpio_reg(&priv->chip, base, GRER);
305 writel(0, reg);
306 /* Clear the falling-edge detect register */
307 reg = gpio_reg(&priv->chip, base, GFER);
308 writel(0, reg);
309 /* Clear the edge detect status register */
310 reg = gpio_reg(&priv->chip, base, GEDR);
311 writel(~0, reg);
314 return 0;
317 static int __maybe_unused intel_gpio_runtime_idle(struct device *dev)
319 int err = pm_schedule_suspend(dev, 500);
320 return err ?: -EBUSY;
323 static const struct dev_pm_ops intel_gpio_pm_ops = {
324 SET_RUNTIME_PM_OPS(NULL, NULL, intel_gpio_runtime_idle)
327 static int intel_gpio_probe(struct pci_dev *pdev,
328 const struct pci_device_id *id)
330 void __iomem *base;
331 struct intel_mid_gpio *priv;
332 u32 gpio_base;
333 u32 irq_base;
334 int retval;
335 struct gpio_irq_chip *girq;
336 struct intel_mid_gpio_ddata *ddata =
337 (struct intel_mid_gpio_ddata *)id->driver_data;
339 retval = pcim_enable_device(pdev);
340 if (retval)
341 return retval;
343 retval = pcim_iomap_regions(pdev, 1 << 0 | 1 << 1, pci_name(pdev));
344 if (retval) {
345 dev_err(&pdev->dev, "I/O memory mapping error\n");
346 return retval;
349 base = pcim_iomap_table(pdev)[1];
351 irq_base = readl(base);
352 gpio_base = readl(sizeof(u32) + base);
354 /* release the IO mapping, since we already get the info from bar1 */
355 pcim_iounmap_regions(pdev, 1 << 1);
357 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
358 if (!priv)
359 return -ENOMEM;
361 priv->reg_base = pcim_iomap_table(pdev)[0];
362 priv->chip.label = dev_name(&pdev->dev);
363 priv->chip.parent = &pdev->dev;
364 priv->chip.request = intel_gpio_request;
365 priv->chip.direction_input = intel_gpio_direction_input;
366 priv->chip.direction_output = intel_gpio_direction_output;
367 priv->chip.get = intel_gpio_get;
368 priv->chip.set = intel_gpio_set;
369 priv->chip.base = gpio_base;
370 priv->chip.ngpio = ddata->ngpio;
371 priv->chip.can_sleep = false;
372 priv->pdev = pdev;
374 spin_lock_init(&priv->lock);
376 girq = &priv->chip.irq;
377 girq->chip = &intel_mid_irqchip;
378 girq->init_hw = intel_mid_irq_init_hw;
379 girq->parent_handler = intel_mid_irq_handler;
380 girq->num_parents = 1;
381 girq->parents = devm_kcalloc(&pdev->dev, girq->num_parents,
382 sizeof(*girq->parents),
383 GFP_KERNEL);
384 if (!girq->parents)
385 return -ENOMEM;
386 girq->parents[0] = pdev->irq;
387 girq->first = irq_base;
388 girq->default_type = IRQ_TYPE_NONE;
389 girq->handler = handle_simple_irq;
391 pci_set_drvdata(pdev, priv);
393 retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv);
394 if (retval) {
395 dev_err(&pdev->dev, "gpiochip_add error %d\n", retval);
396 return retval;
399 pm_runtime_put_noidle(&pdev->dev);
400 pm_runtime_allow(&pdev->dev);
402 return 0;
405 static struct pci_driver intel_gpio_driver = {
406 .name = "intel_mid_gpio",
407 .id_table = intel_gpio_ids,
408 .probe = intel_gpio_probe,
409 .driver = {
410 .pm = &intel_gpio_pm_ops,
414 builtin_pci_driver(intel_gpio_driver);