2 * Freescale vf610 GPIO support through PORT and GPIO
4 * Copyright (c) 2014 Toradex AG.
6 * Author: Stefan Agner <stefan@agner.ch>.
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
18 #include <linux/bitops.h>
19 #include <linux/err.h>
20 #include <linux/gpio.h>
21 #include <linux/init.h>
22 #include <linux/interrupt.h>
24 #include <linux/ioport.h>
25 #include <linux/irq.h>
26 #include <linux/platform_device.h>
28 #include <linux/of_device.h>
29 #include <linux/of_irq.h>
31 #define VF610_GPIO_PER_PORT 32
33 struct fsl_gpio_soc_data {
34 /* SoCs has a Port Data Direction Register (PDDR) */
38 struct vf610_gpio_port {
41 void __iomem *gpio_base;
42 const struct fsl_gpio_soc_data *sdata;
43 u8 irqc[VF610_GPIO_PER_PORT];
47 #define GPIO_PDOR 0x00
48 #define GPIO_PSOR 0x04
49 #define GPIO_PCOR 0x08
50 #define GPIO_PTOR 0x0c
51 #define GPIO_PDIR 0x10
52 #define GPIO_PDDR 0x14
54 #define PORT_PCR(n) ((n) * 0x4)
55 #define PORT_PCR_IRQC_OFFSET 16
57 #define PORT_ISFR 0xa0
58 #define PORT_DFER 0xc0
59 #define PORT_DFCR 0xc4
60 #define PORT_DFWR 0xc8
62 #define PORT_INT_OFF 0x0
63 #define PORT_INT_LOGIC_ZERO 0x8
64 #define PORT_INT_RISING_EDGE 0x9
65 #define PORT_INT_FALLING_EDGE 0xa
66 #define PORT_INT_EITHER_EDGE 0xb
67 #define PORT_INT_LOGIC_ONE 0xc
69 static struct irq_chip vf610_gpio_irq_chip;
71 static const struct fsl_gpio_soc_data imx_data = {
75 static const struct of_device_id vf610_gpio_dt_ids[] = {
76 { .compatible = "fsl,vf610-gpio", .data = NULL, },
77 { .compatible = "fsl,imx7ulp-gpio", .data = &imx_data, },
81 static inline void vf610_gpio_writel(u32 val, void __iomem *reg)
83 writel_relaxed(val, reg);
86 static inline u32 vf610_gpio_readl(void __iomem *reg)
88 return readl_relaxed(reg);
91 static int vf610_gpio_get(struct gpio_chip *gc, unsigned int gpio)
93 struct vf610_gpio_port *port = gpiochip_get_data(gc);
94 unsigned long mask = BIT(gpio);
97 if (port->sdata && port->sdata->have_paddr) {
98 mask &= vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
99 addr = mask ? port->gpio_base + GPIO_PDOR :
100 port->gpio_base + GPIO_PDIR;
101 return !!(vf610_gpio_readl(addr) & BIT(gpio));
103 return !!(vf610_gpio_readl(port->gpio_base + GPIO_PDIR)
108 static void vf610_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
110 struct vf610_gpio_port *port = gpiochip_get_data(gc);
111 unsigned long mask = BIT(gpio);
114 vf610_gpio_writel(mask, port->gpio_base + GPIO_PSOR);
116 vf610_gpio_writel(mask, port->gpio_base + GPIO_PCOR);
119 static int vf610_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
121 struct vf610_gpio_port *port = gpiochip_get_data(chip);
122 unsigned long mask = BIT(gpio);
125 if (port->sdata && port->sdata->have_paddr) {
126 val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
128 vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR);
131 return pinctrl_gpio_direction_input(chip->base + gpio);
134 static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
137 struct vf610_gpio_port *port = gpiochip_get_data(chip);
138 unsigned long mask = BIT(gpio);
140 if (port->sdata && port->sdata->have_paddr)
141 vf610_gpio_writel(mask, port->gpio_base + GPIO_PDDR);
143 vf610_gpio_set(chip, gpio, value);
145 return pinctrl_gpio_direction_output(chip->base + gpio);
148 static void vf610_gpio_irq_handler(struct irq_desc *desc)
150 struct vf610_gpio_port *port =
151 gpiochip_get_data(irq_desc_get_handler_data(desc));
152 struct irq_chip *chip = irq_desc_get_chip(desc);
154 unsigned long irq_isfr;
156 chained_irq_enter(chip, desc);
158 irq_isfr = vf610_gpio_readl(port->base + PORT_ISFR);
160 for_each_set_bit(pin, &irq_isfr, VF610_GPIO_PER_PORT) {
161 vf610_gpio_writel(BIT(pin), port->base + PORT_ISFR);
163 generic_handle_irq(irq_find_mapping(port->gc.irq.domain, pin));
166 chained_irq_exit(chip, desc);
169 static void vf610_gpio_irq_ack(struct irq_data *d)
171 struct vf610_gpio_port *port =
172 gpiochip_get_data(irq_data_get_irq_chip_data(d));
175 vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR);
178 static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type)
180 struct vf610_gpio_port *port =
181 gpiochip_get_data(irq_data_get_irq_chip_data(d));
185 case IRQ_TYPE_EDGE_RISING:
186 irqc = PORT_INT_RISING_EDGE;
188 case IRQ_TYPE_EDGE_FALLING:
189 irqc = PORT_INT_FALLING_EDGE;
191 case IRQ_TYPE_EDGE_BOTH:
192 irqc = PORT_INT_EITHER_EDGE;
194 case IRQ_TYPE_LEVEL_LOW:
195 irqc = PORT_INT_LOGIC_ZERO;
197 case IRQ_TYPE_LEVEL_HIGH:
198 irqc = PORT_INT_LOGIC_ONE;
204 port->irqc[d->hwirq] = irqc;
206 if (type & IRQ_TYPE_LEVEL_MASK)
207 irq_set_handler_locked(d, handle_level_irq);
209 irq_set_handler_locked(d, handle_edge_irq);
214 static void vf610_gpio_irq_mask(struct irq_data *d)
216 struct vf610_gpio_port *port =
217 gpiochip_get_data(irq_data_get_irq_chip_data(d));
218 void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
220 vf610_gpio_writel(0, pcr_base);
223 static void vf610_gpio_irq_unmask(struct irq_data *d)
225 struct vf610_gpio_port *port =
226 gpiochip_get_data(irq_data_get_irq_chip_data(d));
227 void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
229 vf610_gpio_writel(port->irqc[d->hwirq] << PORT_PCR_IRQC_OFFSET,
233 static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable)
235 struct vf610_gpio_port *port =
236 gpiochip_get_data(irq_data_get_irq_chip_data(d));
239 enable_irq_wake(port->irq);
241 disable_irq_wake(port->irq);
246 static struct irq_chip vf610_gpio_irq_chip = {
247 .name = "gpio-vf610",
248 .irq_ack = vf610_gpio_irq_ack,
249 .irq_mask = vf610_gpio_irq_mask,
250 .irq_unmask = vf610_gpio_irq_unmask,
251 .irq_set_type = vf610_gpio_irq_set_type,
252 .irq_set_wake = vf610_gpio_irq_set_wake,
255 static int vf610_gpio_probe(struct platform_device *pdev)
257 const struct of_device_id *of_id = of_match_device(vf610_gpio_dt_ids,
259 struct device *dev = &pdev->dev;
260 struct device_node *np = dev->of_node;
261 struct vf610_gpio_port *port;
262 struct resource *iores;
263 struct gpio_chip *gc;
266 port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
270 port->sdata = of_id->data;
271 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
272 port->base = devm_ioremap_resource(dev, iores);
273 if (IS_ERR(port->base))
274 return PTR_ERR(port->base);
276 iores = platform_get_resource(pdev, IORESOURCE_MEM, 1);
277 port->gpio_base = devm_ioremap_resource(dev, iores);
278 if (IS_ERR(port->gpio_base))
279 return PTR_ERR(port->gpio_base);
281 port->irq = platform_get_irq(pdev, 0);
288 gc->label = "vf610-gpio";
289 gc->ngpio = VF610_GPIO_PER_PORT;
290 gc->base = of_alias_get_id(np, "gpio") * VF610_GPIO_PER_PORT;
292 gc->request = gpiochip_generic_request;
293 gc->free = gpiochip_generic_free;
294 gc->direction_input = vf610_gpio_direction_input;
295 gc->get = vf610_gpio_get;
296 gc->direction_output = vf610_gpio_direction_output;
297 gc->set = vf610_gpio_set;
299 ret = gpiochip_add_data(gc, port);
303 /* Clear the interrupt status register for all GPIO's */
304 vf610_gpio_writel(~0, port->base + PORT_ISFR);
306 ret = gpiochip_irqchip_add(gc, &vf610_gpio_irq_chip, 0,
307 handle_edge_irq, IRQ_TYPE_NONE);
309 dev_err(dev, "failed to add irqchip\n");
313 gpiochip_set_chained_irqchip(gc, &vf610_gpio_irq_chip, port->irq,
314 vf610_gpio_irq_handler);
319 static struct platform_driver vf610_gpio_driver = {
321 .name = "gpio-vf610",
322 .of_match_table = vf610_gpio_dt_ids,
324 .probe = vf610_gpio_probe,
327 builtin_platform_driver(vf610_gpio_driver);