Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * GPIO driver for NXP LPC18xx/43xx.
4 *
5 * Copyright (C) 2018 Vladimir Zapolskiy <vz@mleia.com>
6 * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
7 *
8 */
9
10#include <linux/clk.h>
11#include <linux/gpio/driver.h>
12#include <linux/io.h>
13#include <linux/irqdomain.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/of_address.h>
17#include <linux/of_irq.h>
18#include <linux/pinctrl/consumer.h>
19#include <linux/platform_device.h>
20
21/* LPC18xx GPIO register offsets */
22#define LPC18XX_REG_DIR(n) (0x2000 + n * sizeof(u32))
23
24#define LPC18XX_MAX_PORTS 8
25#define LPC18XX_PINS_PER_PORT 32
26
27/* LPC18xx GPIO pin interrupt controller register offsets */
28#define LPC18XX_GPIO_PIN_IC_ISEL 0x00
29#define LPC18XX_GPIO_PIN_IC_IENR 0x04
30#define LPC18XX_GPIO_PIN_IC_SIENR 0x08
31#define LPC18XX_GPIO_PIN_IC_CIENR 0x0c
32#define LPC18XX_GPIO_PIN_IC_IENF 0x10
33#define LPC18XX_GPIO_PIN_IC_SIENF 0x14
34#define LPC18XX_GPIO_PIN_IC_CIENF 0x18
35#define LPC18XX_GPIO_PIN_IC_RISE 0x1c
36#define LPC18XX_GPIO_PIN_IC_FALL 0x20
37#define LPC18XX_GPIO_PIN_IC_IST 0x24
38
39#define NR_LPC18XX_GPIO_PIN_IC_IRQS 8
40
41struct lpc18xx_gpio_pin_ic {
42 void __iomem *base;
43 struct irq_domain *domain;
44 struct raw_spinlock lock;
45};
46
47struct lpc18xx_gpio_chip {
48 struct gpio_chip gpio;
49 void __iomem *base;
50 struct lpc18xx_gpio_pin_ic *pin_ic;
51 spinlock_t lock;
52};
53
54static inline void lpc18xx_gpio_pin_ic_isel(struct lpc18xx_gpio_pin_ic *ic,
55 u32 pin, bool set)
56{
57 u32 val = readl_relaxed(ic->base + LPC18XX_GPIO_PIN_IC_ISEL);
58
59 if (set)
60 val &= ~BIT(pin);
61 else
62 val |= BIT(pin);
63
64 writel_relaxed(val, ic->base + LPC18XX_GPIO_PIN_IC_ISEL);
65}
66
67static inline void lpc18xx_gpio_pin_ic_set(struct lpc18xx_gpio_pin_ic *ic,
68 u32 pin, u32 reg)
69{
70 writel_relaxed(BIT(pin), ic->base + reg);
71}
72
73static void lpc18xx_gpio_pin_ic_mask(struct irq_data *d)
74{
75 struct lpc18xx_gpio_pin_ic *ic = d->chip_data;
76 u32 type = irqd_get_trigger_type(d);
77
78 raw_spin_lock(&ic->lock);
79
80 if (type & IRQ_TYPE_LEVEL_MASK || type & IRQ_TYPE_EDGE_RISING)
81 lpc18xx_gpio_pin_ic_set(ic, d->hwirq,
82 LPC18XX_GPIO_PIN_IC_CIENR);
83
84 if (type & IRQ_TYPE_EDGE_FALLING)
85 lpc18xx_gpio_pin_ic_set(ic, d->hwirq,
86 LPC18XX_GPIO_PIN_IC_CIENF);
87
88 raw_spin_unlock(&ic->lock);
89
90 irq_chip_mask_parent(d);
91}
92
93static void lpc18xx_gpio_pin_ic_unmask(struct irq_data *d)
94{
95 struct lpc18xx_gpio_pin_ic *ic = d->chip_data;
96 u32 type = irqd_get_trigger_type(d);
97
98 raw_spin_lock(&ic->lock);
99
100 if (type & IRQ_TYPE_LEVEL_MASK || type & IRQ_TYPE_EDGE_RISING)
101 lpc18xx_gpio_pin_ic_set(ic, d->hwirq,
102 LPC18XX_GPIO_PIN_IC_SIENR);
103
104 if (type & IRQ_TYPE_EDGE_FALLING)
105 lpc18xx_gpio_pin_ic_set(ic, d->hwirq,
106 LPC18XX_GPIO_PIN_IC_SIENF);
107
108 raw_spin_unlock(&ic->lock);
109
110 irq_chip_unmask_parent(d);
111}
112
113static void lpc18xx_gpio_pin_ic_eoi(struct irq_data *d)
114{
115 struct lpc18xx_gpio_pin_ic *ic = d->chip_data;
116 u32 type = irqd_get_trigger_type(d);
117
118 raw_spin_lock(&ic->lock);
119
120 if (type & IRQ_TYPE_EDGE_BOTH)
121 lpc18xx_gpio_pin_ic_set(ic, d->hwirq,
122 LPC18XX_GPIO_PIN_IC_IST);
123
124 raw_spin_unlock(&ic->lock);
125
126 irq_chip_eoi_parent(d);
127}
128
129static int lpc18xx_gpio_pin_ic_set_type(struct irq_data *d, unsigned int type)
130{
131 struct lpc18xx_gpio_pin_ic *ic = d->chip_data;
132
133 raw_spin_lock(&ic->lock);
134
135 if (type & IRQ_TYPE_LEVEL_HIGH) {
136 lpc18xx_gpio_pin_ic_isel(ic, d->hwirq, true);
137 lpc18xx_gpio_pin_ic_set(ic, d->hwirq,
138 LPC18XX_GPIO_PIN_IC_SIENF);
139 } else if (type & IRQ_TYPE_LEVEL_LOW) {
140 lpc18xx_gpio_pin_ic_isel(ic, d->hwirq, true);
141 lpc18xx_gpio_pin_ic_set(ic, d->hwirq,
142 LPC18XX_GPIO_PIN_IC_CIENF);
143 } else {
144 lpc18xx_gpio_pin_ic_isel(ic, d->hwirq, false);
145 }
146
147 raw_spin_unlock(&ic->lock);
148
149 return 0;
150}
151
152static struct irq_chip lpc18xx_gpio_pin_ic = {
153 .name = "LPC18xx GPIO pin",
154 .irq_mask = lpc18xx_gpio_pin_ic_mask,
155 .irq_unmask = lpc18xx_gpio_pin_ic_unmask,
156 .irq_eoi = lpc18xx_gpio_pin_ic_eoi,
157 .irq_set_type = lpc18xx_gpio_pin_ic_set_type,
158 .flags = IRQCHIP_SET_TYPE_MASKED,
159};
160
161static int lpc18xx_gpio_pin_ic_domain_alloc(struct irq_domain *domain,
162 unsigned int virq,
163 unsigned int nr_irqs, void *data)
164{
165 struct irq_fwspec parent_fwspec, *fwspec = data;
166 struct lpc18xx_gpio_pin_ic *ic = domain->host_data;
167 irq_hw_number_t hwirq;
168 int ret;
169
170 if (nr_irqs != 1)
171 return -EINVAL;
172
173 hwirq = fwspec->param[0];
174 if (hwirq >= NR_LPC18XX_GPIO_PIN_IC_IRQS)
175 return -EINVAL;
176
177 /*
178 * All LPC18xx/LPC43xx GPIO pin hardware interrupts are translated
179 * into edge interrupts 32...39 on parent Cortex-M3/M4 NVIC
180 */
181 parent_fwspec.fwnode = domain->parent->fwnode;
182 parent_fwspec.param_count = 1;
183 parent_fwspec.param[0] = hwirq + 32;
184
185 ret = irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec);
186 if (ret < 0) {
187 pr_err("failed to allocate parent irq %u: %d\n",
188 parent_fwspec.param[0], ret);
189 return ret;
190 }
191
192 return irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
193 &lpc18xx_gpio_pin_ic, ic);
194}
195
196static const struct irq_domain_ops lpc18xx_gpio_pin_ic_domain_ops = {
197 .alloc = lpc18xx_gpio_pin_ic_domain_alloc,
198 .xlate = irq_domain_xlate_twocell,
199 .free = irq_domain_free_irqs_common,
200};
201
202static int lpc18xx_gpio_pin_ic_probe(struct lpc18xx_gpio_chip *gc)
203{
204 struct device *dev = gc->gpio.parent;
205 struct irq_domain *parent_domain;
206 struct device_node *parent_node;
207 struct lpc18xx_gpio_pin_ic *ic;
208 struct resource res;
209 int ret, index;
210
211 parent_node = of_irq_find_parent(dev->of_node);
212 if (!parent_node)
213 return -ENXIO;
214
215 parent_domain = irq_find_host(parent_node);
216 of_node_put(parent_node);
217 if (!parent_domain)
218 return -ENXIO;
219
220 ic = devm_kzalloc(dev, sizeof(*ic), GFP_KERNEL);
221 if (!ic)
222 return -ENOMEM;
223
224 index = of_property_match_string(dev->of_node, "reg-names",
225 "gpio-pin-ic");
226 if (index < 0) {
227 ret = -ENODEV;
228 goto free_ic;
229 }
230
231 ret = of_address_to_resource(dev->of_node, index, &res);
232 if (ret < 0)
233 goto free_ic;
234
235 ic->base = devm_ioremap_resource(dev, &res);
236 if (IS_ERR(ic->base)) {
237 ret = PTR_ERR(ic->base);
238 goto free_ic;
239 }
240
241 raw_spin_lock_init(&ic->lock);
242
243 ic->domain = irq_domain_add_hierarchy(parent_domain, 0,
244 NR_LPC18XX_GPIO_PIN_IC_IRQS,
245 dev->of_node,
246 &lpc18xx_gpio_pin_ic_domain_ops,
247 ic);
248 if (!ic->domain) {
249 pr_err("unable to add irq domain\n");
250 ret = -ENODEV;
251 goto free_iomap;
252 }
253
254 gc->pin_ic = ic;
255
256 return 0;
257
258free_iomap:
259 devm_iounmap(dev, ic->base);
260free_ic:
261 devm_kfree(dev, ic);
262
263 return ret;
264}
265
266static void lpc18xx_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
267{
268 struct lpc18xx_gpio_chip *gc = gpiochip_get_data(chip);
269 writeb(value ? 1 : 0, gc->base + offset);
270}
271
272static int lpc18xx_gpio_get(struct gpio_chip *chip, unsigned offset)
273{
274 struct lpc18xx_gpio_chip *gc = gpiochip_get_data(chip);
275 return !!readb(gc->base + offset);
276}
277
278static int lpc18xx_gpio_direction(struct gpio_chip *chip, unsigned offset,
279 bool out)
280{
281 struct lpc18xx_gpio_chip *gc = gpiochip_get_data(chip);
282 unsigned long flags;
283 u32 port, pin, dir;
284
285 port = offset / LPC18XX_PINS_PER_PORT;
286 pin = offset % LPC18XX_PINS_PER_PORT;
287
288 spin_lock_irqsave(&gc->lock, flags);
289 dir = readl(gc->base + LPC18XX_REG_DIR(port));
290 if (out)
291 dir |= BIT(pin);
292 else
293 dir &= ~BIT(pin);
294 writel(dir, gc->base + LPC18XX_REG_DIR(port));
295 spin_unlock_irqrestore(&gc->lock, flags);
296
297 return 0;
298}
299
300static int lpc18xx_gpio_direction_input(struct gpio_chip *chip,
301 unsigned offset)
302{
303 return lpc18xx_gpio_direction(chip, offset, false);
304}
305
306static int lpc18xx_gpio_direction_output(struct gpio_chip *chip,
307 unsigned offset, int value)
308{
309 lpc18xx_gpio_set(chip, offset, value);
310 return lpc18xx_gpio_direction(chip, offset, true);
311}
312
313static const struct gpio_chip lpc18xx_chip = {
314 .label = "lpc18xx/43xx-gpio",
315 .request = gpiochip_generic_request,
316 .free = gpiochip_generic_free,
317 .direction_input = lpc18xx_gpio_direction_input,
318 .direction_output = lpc18xx_gpio_direction_output,
319 .set = lpc18xx_gpio_set,
320 .get = lpc18xx_gpio_get,
321 .ngpio = LPC18XX_MAX_PORTS * LPC18XX_PINS_PER_PORT,
322 .owner = THIS_MODULE,
323};
324
325static int lpc18xx_gpio_probe(struct platform_device *pdev)
326{
327 struct device *dev = &pdev->dev;
328 struct lpc18xx_gpio_chip *gc;
329 int index, ret;
330 struct clk *clk;
331
332 gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
333 if (!gc)
334 return -ENOMEM;
335
336 gc->gpio = lpc18xx_chip;
337 platform_set_drvdata(pdev, gc);
338
339 index = of_property_match_string(dev->of_node, "reg-names", "gpio");
340 if (index < 0) {
341 /* To support backward compatibility take the first resource */
342 gc->base = devm_platform_ioremap_resource(pdev, 0);
343 } else {
344 struct resource res;
345
346 ret = of_address_to_resource(dev->of_node, index, &res);
347 if (ret < 0)
348 return ret;
349
350 gc->base = devm_ioremap_resource(dev, &res);
351 }
352 if (IS_ERR(gc->base))
353 return PTR_ERR(gc->base);
354
355 clk = devm_clk_get_enabled(dev, NULL);
356 if (IS_ERR(clk)) {
357 dev_err(dev, "input clock not found\n");
358 return PTR_ERR(clk);
359 }
360
361 spin_lock_init(&gc->lock);
362
363 gc->gpio.parent = dev;
364
365 ret = devm_gpiochip_add_data(dev, &gc->gpio, gc);
366 if (ret)
367 return dev_err_probe(dev, ret, "failed to add gpio chip\n");
368
369 /* On error GPIO pin interrupt controller just won't be registered */
370 lpc18xx_gpio_pin_ic_probe(gc);
371
372 return 0;
373}
374
375static void lpc18xx_gpio_remove(struct platform_device *pdev)
376{
377 struct lpc18xx_gpio_chip *gc = platform_get_drvdata(pdev);
378
379 if (gc->pin_ic)
380 irq_domain_remove(gc->pin_ic->domain);
381}
382
383static const struct of_device_id lpc18xx_gpio_match[] = {
384 { .compatible = "nxp,lpc1850-gpio" },
385 { }
386};
387MODULE_DEVICE_TABLE(of, lpc18xx_gpio_match);
388
389static struct platform_driver lpc18xx_gpio_driver = {
390 .probe = lpc18xx_gpio_probe,
391 .remove = lpc18xx_gpio_remove,
392 .driver = {
393 .name = "lpc18xx-gpio",
394 .of_match_table = lpc18xx_gpio_match,
395 },
396};
397module_platform_driver(lpc18xx_gpio_driver);
398
399MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
400MODULE_AUTHOR("Vladimir Zapolskiy <vz@mleia.com>");
401MODULE_DESCRIPTION("GPIO driver for LPC18xx/43xx");
402MODULE_LICENSE("GPL v2");
1/*
2 * GPIO driver for NXP LPC18xx/43xx.
3 *
4 * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
5 *
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.
9 *
10 */
11
12#include <linux/clk.h>
13#include <linux/gpio/driver.h>
14#include <linux/io.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/of_gpio.h>
18#include <linux/pinctrl/consumer.h>
19#include <linux/platform_device.h>
20
21/* LPC18xx GPIO register offsets */
22#define LPC18XX_REG_DIR(n) (0x2000 + n * sizeof(u32))
23
24#define LPC18XX_MAX_PORTS 8
25#define LPC18XX_PINS_PER_PORT 32
26
27struct lpc18xx_gpio_chip {
28 struct gpio_chip gpio;
29 void __iomem *base;
30 struct clk *clk;
31 spinlock_t lock;
32};
33
34static void lpc18xx_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
35{
36 struct lpc18xx_gpio_chip *gc = gpiochip_get_data(chip);
37 writeb(value ? 1 : 0, gc->base + offset);
38}
39
40static int lpc18xx_gpio_get(struct gpio_chip *chip, unsigned offset)
41{
42 struct lpc18xx_gpio_chip *gc = gpiochip_get_data(chip);
43 return !!readb(gc->base + offset);
44}
45
46static int lpc18xx_gpio_direction(struct gpio_chip *chip, unsigned offset,
47 bool out)
48{
49 struct lpc18xx_gpio_chip *gc = gpiochip_get_data(chip);
50 unsigned long flags;
51 u32 port, pin, dir;
52
53 port = offset / LPC18XX_PINS_PER_PORT;
54 pin = offset % LPC18XX_PINS_PER_PORT;
55
56 spin_lock_irqsave(&gc->lock, flags);
57 dir = readl(gc->base + LPC18XX_REG_DIR(port));
58 if (out)
59 dir |= BIT(pin);
60 else
61 dir &= ~BIT(pin);
62 writel(dir, gc->base + LPC18XX_REG_DIR(port));
63 spin_unlock_irqrestore(&gc->lock, flags);
64
65 return 0;
66}
67
68static int lpc18xx_gpio_direction_input(struct gpio_chip *chip,
69 unsigned offset)
70{
71 return lpc18xx_gpio_direction(chip, offset, false);
72}
73
74static int lpc18xx_gpio_direction_output(struct gpio_chip *chip,
75 unsigned offset, int value)
76{
77 lpc18xx_gpio_set(chip, offset, value);
78 return lpc18xx_gpio_direction(chip, offset, true);
79}
80
81static struct gpio_chip lpc18xx_chip = {
82 .label = "lpc18xx/43xx-gpio",
83 .request = gpiochip_generic_request,
84 .free = gpiochip_generic_free,
85 .direction_input = lpc18xx_gpio_direction_input,
86 .direction_output = lpc18xx_gpio_direction_output,
87 .set = lpc18xx_gpio_set,
88 .get = lpc18xx_gpio_get,
89 .ngpio = LPC18XX_MAX_PORTS * LPC18XX_PINS_PER_PORT,
90 .owner = THIS_MODULE,
91};
92
93static int lpc18xx_gpio_probe(struct platform_device *pdev)
94{
95 struct lpc18xx_gpio_chip *gc;
96 struct resource *res;
97 int ret;
98
99 gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
100 if (!gc)
101 return -ENOMEM;
102
103 gc->gpio = lpc18xx_chip;
104 platform_set_drvdata(pdev, gc);
105
106 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
107 gc->base = devm_ioremap_resource(&pdev->dev, res);
108 if (IS_ERR(gc->base))
109 return PTR_ERR(gc->base);
110
111 gc->clk = devm_clk_get(&pdev->dev, NULL);
112 if (IS_ERR(gc->clk)) {
113 dev_err(&pdev->dev, "input clock not found\n");
114 return PTR_ERR(gc->clk);
115 }
116
117 ret = clk_prepare_enable(gc->clk);
118 if (ret) {
119 dev_err(&pdev->dev, "unable to enable clock\n");
120 return ret;
121 }
122
123 spin_lock_init(&gc->lock);
124
125 gc->gpio.parent = &pdev->dev;
126
127 ret = gpiochip_add_data(&gc->gpio, gc);
128 if (ret) {
129 dev_err(&pdev->dev, "failed to add gpio chip\n");
130 clk_disable_unprepare(gc->clk);
131 return ret;
132 }
133
134 return 0;
135}
136
137static int lpc18xx_gpio_remove(struct platform_device *pdev)
138{
139 struct lpc18xx_gpio_chip *gc = platform_get_drvdata(pdev);
140
141 gpiochip_remove(&gc->gpio);
142 clk_disable_unprepare(gc->clk);
143
144 return 0;
145}
146
147static const struct of_device_id lpc18xx_gpio_match[] = {
148 { .compatible = "nxp,lpc1850-gpio" },
149 { }
150};
151MODULE_DEVICE_TABLE(of, lpc18xx_gpio_match);
152
153static struct platform_driver lpc18xx_gpio_driver = {
154 .probe = lpc18xx_gpio_probe,
155 .remove = lpc18xx_gpio_remove,
156 .driver = {
157 .name = "lpc18xx-gpio",
158 .of_match_table = lpc18xx_gpio_match,
159 },
160};
161module_platform_driver(lpc18xx_gpio_driver);
162
163MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
164MODULE_DESCRIPTION("GPIO driver for LPC18xx/43xx");
165MODULE_LICENSE("GPL v2");