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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Freescale vf610 GPIO support through PORT and GPIO
4 *
5 * Copyright (c) 2014 Toradex AG.
6 *
7 * Author: Stefan Agner <stefan@agner.ch>.
8 */
9#include <linux/bitops.h>
10#include <linux/clk.h>
11#include <linux/err.h>
12#include <linux/gpio/driver.h>
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/io.h>
16#include <linux/ioport.h>
17#include <linux/irq.h>
18#include <linux/platform_device.h>
19#include <linux/of.h>
20#include <linux/of_device.h>
21#include <linux/of_irq.h>
22
23#define VF610_GPIO_PER_PORT 32
24
25struct fsl_gpio_soc_data {
26 /* SoCs has a Port Data Direction Register (PDDR) */
27 bool have_paddr;
28};
29
30struct vf610_gpio_port {
31 struct gpio_chip gc;
32 struct irq_chip ic;
33 void __iomem *base;
34 void __iomem *gpio_base;
35 const struct fsl_gpio_soc_data *sdata;
36 u8 irqc[VF610_GPIO_PER_PORT];
37 struct clk *clk_port;
38 struct clk *clk_gpio;
39 int irq;
40};
41
42#define GPIO_PDOR 0x00
43#define GPIO_PSOR 0x04
44#define GPIO_PCOR 0x08
45#define GPIO_PTOR 0x0c
46#define GPIO_PDIR 0x10
47#define GPIO_PDDR 0x14
48
49#define PORT_PCR(n) ((n) * 0x4)
50#define PORT_PCR_IRQC_OFFSET 16
51
52#define PORT_ISFR 0xa0
53#define PORT_DFER 0xc0
54#define PORT_DFCR 0xc4
55#define PORT_DFWR 0xc8
56
57#define PORT_INT_OFF 0x0
58#define PORT_INT_LOGIC_ZERO 0x8
59#define PORT_INT_RISING_EDGE 0x9
60#define PORT_INT_FALLING_EDGE 0xa
61#define PORT_INT_EITHER_EDGE 0xb
62#define PORT_INT_LOGIC_ONE 0xc
63
64static const struct fsl_gpio_soc_data imx_data = {
65 .have_paddr = true,
66};
67
68static const struct of_device_id vf610_gpio_dt_ids[] = {
69 { .compatible = "fsl,vf610-gpio", .data = NULL, },
70 { .compatible = "fsl,imx7ulp-gpio", .data = &imx_data, },
71 { /* sentinel */ }
72};
73
74static inline void vf610_gpio_writel(u32 val, void __iomem *reg)
75{
76 writel_relaxed(val, reg);
77}
78
79static inline u32 vf610_gpio_readl(void __iomem *reg)
80{
81 return readl_relaxed(reg);
82}
83
84static int vf610_gpio_get(struct gpio_chip *gc, unsigned int gpio)
85{
86 struct vf610_gpio_port *port = gpiochip_get_data(gc);
87 unsigned long mask = BIT(gpio);
88 unsigned long offset = GPIO_PDIR;
89
90 if (port->sdata && port->sdata->have_paddr) {
91 mask &= vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
92 if (mask)
93 offset = GPIO_PDOR;
94 }
95
96 return !!(vf610_gpio_readl(port->gpio_base + offset) & BIT(gpio));
97}
98
99static void vf610_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
100{
101 struct vf610_gpio_port *port = gpiochip_get_data(gc);
102 unsigned long mask = BIT(gpio);
103 unsigned long offset = val ? GPIO_PSOR : GPIO_PCOR;
104
105 vf610_gpio_writel(mask, port->gpio_base + offset);
106}
107
108static int vf610_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
109{
110 struct vf610_gpio_port *port = gpiochip_get_data(chip);
111 unsigned long mask = BIT(gpio);
112 u32 val;
113
114 if (port->sdata && port->sdata->have_paddr) {
115 val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
116 val &= ~mask;
117 vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR);
118 }
119
120 return pinctrl_gpio_direction_input(chip->base + gpio);
121}
122
123static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
124 int value)
125{
126 struct vf610_gpio_port *port = gpiochip_get_data(chip);
127 unsigned long mask = BIT(gpio);
128
129 if (port->sdata && port->sdata->have_paddr)
130 vf610_gpio_writel(mask, port->gpio_base + GPIO_PDDR);
131
132 vf610_gpio_set(chip, gpio, value);
133
134 return pinctrl_gpio_direction_output(chip->base + gpio);
135}
136
137static void vf610_gpio_irq_handler(struct irq_desc *desc)
138{
139 struct vf610_gpio_port *port =
140 gpiochip_get_data(irq_desc_get_handler_data(desc));
141 struct irq_chip *chip = irq_desc_get_chip(desc);
142 int pin;
143 unsigned long irq_isfr;
144
145 chained_irq_enter(chip, desc);
146
147 irq_isfr = vf610_gpio_readl(port->base + PORT_ISFR);
148
149 for_each_set_bit(pin, &irq_isfr, VF610_GPIO_PER_PORT) {
150 vf610_gpio_writel(BIT(pin), port->base + PORT_ISFR);
151
152 generic_handle_irq(irq_find_mapping(port->gc.irq.domain, pin));
153 }
154
155 chained_irq_exit(chip, desc);
156}
157
158static void vf610_gpio_irq_ack(struct irq_data *d)
159{
160 struct vf610_gpio_port *port =
161 gpiochip_get_data(irq_data_get_irq_chip_data(d));
162 int gpio = d->hwirq;
163
164 vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR);
165}
166
167static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type)
168{
169 struct vf610_gpio_port *port =
170 gpiochip_get_data(irq_data_get_irq_chip_data(d));
171 u8 irqc;
172
173 switch (type) {
174 case IRQ_TYPE_EDGE_RISING:
175 irqc = PORT_INT_RISING_EDGE;
176 break;
177 case IRQ_TYPE_EDGE_FALLING:
178 irqc = PORT_INT_FALLING_EDGE;
179 break;
180 case IRQ_TYPE_EDGE_BOTH:
181 irqc = PORT_INT_EITHER_EDGE;
182 break;
183 case IRQ_TYPE_LEVEL_LOW:
184 irqc = PORT_INT_LOGIC_ZERO;
185 break;
186 case IRQ_TYPE_LEVEL_HIGH:
187 irqc = PORT_INT_LOGIC_ONE;
188 break;
189 default:
190 return -EINVAL;
191 }
192
193 port->irqc[d->hwirq] = irqc;
194
195 if (type & IRQ_TYPE_LEVEL_MASK)
196 irq_set_handler_locked(d, handle_level_irq);
197 else
198 irq_set_handler_locked(d, handle_edge_irq);
199
200 return 0;
201}
202
203static void vf610_gpio_irq_mask(struct irq_data *d)
204{
205 struct vf610_gpio_port *port =
206 gpiochip_get_data(irq_data_get_irq_chip_data(d));
207 void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
208
209 vf610_gpio_writel(0, pcr_base);
210}
211
212static void vf610_gpio_irq_unmask(struct irq_data *d)
213{
214 struct vf610_gpio_port *port =
215 gpiochip_get_data(irq_data_get_irq_chip_data(d));
216 void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
217
218 vf610_gpio_writel(port->irqc[d->hwirq] << PORT_PCR_IRQC_OFFSET,
219 pcr_base);
220}
221
222static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable)
223{
224 struct vf610_gpio_port *port =
225 gpiochip_get_data(irq_data_get_irq_chip_data(d));
226
227 if (enable)
228 enable_irq_wake(port->irq);
229 else
230 disable_irq_wake(port->irq);
231
232 return 0;
233}
234
235static void vf610_gpio_disable_clk(void *data)
236{
237 clk_disable_unprepare(data);
238}
239
240static int vf610_gpio_probe(struct platform_device *pdev)
241{
242 struct device *dev = &pdev->dev;
243 struct device_node *np = dev->of_node;
244 struct vf610_gpio_port *port;
245 struct gpio_chip *gc;
246 struct gpio_irq_chip *girq;
247 struct irq_chip *ic;
248 int i;
249 int ret;
250
251 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
252 if (!port)
253 return -ENOMEM;
254
255 port->sdata = of_device_get_match_data(dev);
256 port->base = devm_platform_ioremap_resource(pdev, 0);
257 if (IS_ERR(port->base))
258 return PTR_ERR(port->base);
259
260 port->gpio_base = devm_platform_ioremap_resource(pdev, 1);
261 if (IS_ERR(port->gpio_base))
262 return PTR_ERR(port->gpio_base);
263
264 port->irq = platform_get_irq(pdev, 0);
265 if (port->irq < 0)
266 return port->irq;
267
268 port->clk_port = devm_clk_get(dev, "port");
269 ret = PTR_ERR_OR_ZERO(port->clk_port);
270 if (!ret) {
271 ret = clk_prepare_enable(port->clk_port);
272 if (ret)
273 return ret;
274 ret = devm_add_action_or_reset(dev, vf610_gpio_disable_clk,
275 port->clk_port);
276 if (ret)
277 return ret;
278 } else if (ret == -EPROBE_DEFER) {
279 /*
280 * Percolate deferrals, for anything else,
281 * just live without the clocking.
282 */
283 return ret;
284 }
285
286 port->clk_gpio = devm_clk_get(dev, "gpio");
287 ret = PTR_ERR_OR_ZERO(port->clk_gpio);
288 if (!ret) {
289 ret = clk_prepare_enable(port->clk_gpio);
290 if (ret)
291 return ret;
292 ret = devm_add_action_or_reset(dev, vf610_gpio_disable_clk,
293 port->clk_gpio);
294 if (ret)
295 return ret;
296 } else if (ret == -EPROBE_DEFER) {
297 return ret;
298 }
299
300 gc = &port->gc;
301 gc->of_node = np;
302 gc->parent = dev;
303 gc->label = "vf610-gpio";
304 gc->ngpio = VF610_GPIO_PER_PORT;
305 gc->base = of_alias_get_id(np, "gpio") * VF610_GPIO_PER_PORT;
306
307 gc->request = gpiochip_generic_request;
308 gc->free = gpiochip_generic_free;
309 gc->direction_input = vf610_gpio_direction_input;
310 gc->get = vf610_gpio_get;
311 gc->direction_output = vf610_gpio_direction_output;
312 gc->set = vf610_gpio_set;
313
314 ic = &port->ic;
315 ic->name = "gpio-vf610";
316 ic->irq_ack = vf610_gpio_irq_ack;
317 ic->irq_mask = vf610_gpio_irq_mask;
318 ic->irq_unmask = vf610_gpio_irq_unmask;
319 ic->irq_set_type = vf610_gpio_irq_set_type;
320 ic->irq_set_wake = vf610_gpio_irq_set_wake;
321
322 /* Mask all GPIO interrupts */
323 for (i = 0; i < gc->ngpio; i++)
324 vf610_gpio_writel(0, port->base + PORT_PCR(i));
325
326 /* Clear the interrupt status register for all GPIO's */
327 vf610_gpio_writel(~0, port->base + PORT_ISFR);
328
329 girq = &gc->irq;
330 girq->chip = ic;
331 girq->parent_handler = vf610_gpio_irq_handler;
332 girq->num_parents = 1;
333 girq->parents = devm_kcalloc(&pdev->dev, 1,
334 sizeof(*girq->parents),
335 GFP_KERNEL);
336 if (!girq->parents)
337 return -ENOMEM;
338 girq->parents[0] = port->irq;
339 girq->default_type = IRQ_TYPE_NONE;
340 girq->handler = handle_edge_irq;
341
342 return devm_gpiochip_add_data(dev, gc, port);
343}
344
345static struct platform_driver vf610_gpio_driver = {
346 .driver = {
347 .name = "gpio-vf610",
348 .of_match_table = vf610_gpio_dt_ids,
349 },
350 .probe = vf610_gpio_probe,
351};
352
353builtin_platform_driver(vf610_gpio_driver);