1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23#include <linux/init.h>
24#include <linux/interrupt.h>
25#include <linux/io.h>
26#include <linux/irq.h>
27#include <linux/gpio.h>
28#include <linux/of.h>
29#include <linux/of_address.h>
30#include <linux/of_device.h>
31#include <linux/platform_device.h>
32#include <linux/slab.h>
33#include <linux/basic_mmio_gpio.h>
34#include <linux/module.h>
35
36#define MXS_SET 0x4
37#define MXS_CLR 0x8
38
39#define PINCTRL_DOUT(p) ((is_imx23_gpio(p) ? 0x0500 : 0x0700) + (p->id) * 0x10)
40#define PINCTRL_DIN(p) ((is_imx23_gpio(p) ? 0x0600 : 0x0900) + (p->id) * 0x10)
41#define PINCTRL_DOE(p) ((is_imx23_gpio(p) ? 0x0700 : 0x0b00) + (p->id) * 0x10)
42#define PINCTRL_PIN2IRQ(p) ((is_imx23_gpio(p) ? 0x0800 : 0x1000) + (p->id) * 0x10)
43#define PINCTRL_IRQEN(p) ((is_imx23_gpio(p) ? 0x0900 : 0x1100) + (p->id) * 0x10)
44#define PINCTRL_IRQLEV(p) ((is_imx23_gpio(p) ? 0x0a00 : 0x1200) + (p->id) * 0x10)
45#define PINCTRL_IRQPOL(p) ((is_imx23_gpio(p) ? 0x0b00 : 0x1300) + (p->id) * 0x10)
46#define PINCTRL_IRQSTAT(p) ((is_imx23_gpio(p) ? 0x0c00 : 0x1400) + (p->id) * 0x10)
47
48#define GPIO_INT_FALL_EDGE 0x0
49#define GPIO_INT_LOW_LEV 0x1
50#define GPIO_INT_RISE_EDGE 0x2
51#define GPIO_INT_HIGH_LEV 0x3
52#define GPIO_INT_LEV_MASK (1 << 0)
53#define GPIO_INT_POL_MASK (1 << 1)
54
55#define irq_to_gpio(irq) ((irq) - MXS_GPIO_IRQ_START)
56
57enum mxs_gpio_id {
58 IMX23_GPIO,
59 IMX28_GPIO,
60};
61
62struct mxs_gpio_port {
63 void __iomem *base;
64 int id;
65 int irq;
66 int virtual_irq_start;
67 struct bgpio_chip bgc;
68 enum mxs_gpio_id devid;
69};
70
71static inline int is_imx23_gpio(struct mxs_gpio_port *port)
72{
73 return port->devid == IMX23_GPIO;
74}
75
76static inline int is_imx28_gpio(struct mxs_gpio_port *port)
77{
78 return port->devid == IMX28_GPIO;
79}
80
81
82
83static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
84{
85 u32 gpio = irq_to_gpio(d->irq);
86 u32 pin_mask = 1 << (gpio & 31);
87 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
88 struct mxs_gpio_port *port = gc->private;
89 void __iomem *pin_addr;
90 int edge;
91
92 switch (type) {
93 case IRQ_TYPE_EDGE_RISING:
94 edge = GPIO_INT_RISE_EDGE;
95 break;
96 case IRQ_TYPE_EDGE_FALLING:
97 edge = GPIO_INT_FALL_EDGE;
98 break;
99 case IRQ_TYPE_LEVEL_LOW:
100 edge = GPIO_INT_LOW_LEV;
101 break;
102 case IRQ_TYPE_LEVEL_HIGH:
103 edge = GPIO_INT_HIGH_LEV;
104 break;
105 default:
106 return -EINVAL;
107 }
108
109
110 pin_addr = port->base + PINCTRL_IRQLEV(port);
111 if (edge & GPIO_INT_LEV_MASK)
112 writel(pin_mask, pin_addr + MXS_SET);
113 else
114 writel(pin_mask, pin_addr + MXS_CLR);
115
116
117 pin_addr = port->base + PINCTRL_IRQPOL(port);
118 if (edge & GPIO_INT_POL_MASK)
119 writel(pin_mask, pin_addr + MXS_SET);
120 else
121 writel(pin_mask, pin_addr + MXS_CLR);
122
123 writel(1 << (gpio & 0x1f),
124 port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
125
126 return 0;
127}
128
129
130static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
131{
132 u32 irq_stat;
133 struct mxs_gpio_port *port = irq_get_handler_data(irq);
134 u32 gpio_irq_no_base = port->virtual_irq_start;
135
136 desc->irq_data.chip->irq_ack(&desc->irq_data);
137
138 irq_stat = readl(port->base + PINCTRL_IRQSTAT(port)) &
139 readl(port->base + PINCTRL_IRQEN(port));
140
141 while (irq_stat != 0) {
142 int irqoffset = fls(irq_stat) - 1;
143 generic_handle_irq(gpio_irq_no_base + irqoffset);
144 irq_stat &= ~(1 << irqoffset);
145 }
146}
147
148
149
150
151
152
153
154
155
156
157static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
158{
159 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
160 struct mxs_gpio_port *port = gc->private;
161
162 if (enable)
163 enable_irq_wake(port->irq);
164 else
165 disable_irq_wake(port->irq);
166
167 return 0;
168}
169
170static void __init mxs_gpio_init_gc(struct mxs_gpio_port *port)
171{
172 struct irq_chip_generic *gc;
173 struct irq_chip_type *ct;
174
175 gc = irq_alloc_generic_chip("gpio-mxs", 1, port->virtual_irq_start,
176 port->base, handle_level_irq);
177 gc->private = port;
178
179 ct = gc->chip_types;
180 ct->chip.irq_ack = irq_gc_ack_set_bit;
181 ct->chip.irq_mask = irq_gc_mask_clr_bit;
182 ct->chip.irq_unmask = irq_gc_mask_set_bit;
183 ct->chip.irq_set_type = mxs_gpio_set_irq_type;
184 ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
185 ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR;
186 ct->regs.mask = PINCTRL_IRQEN(port);
187
188 irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
189}
190
191static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
192{
193 struct bgpio_chip *bgc = to_bgpio_chip(gc);
194 struct mxs_gpio_port *port =
195 container_of(bgc, struct mxs_gpio_port, bgc);
196
197 return port->virtual_irq_start + offset;
198}
199
200static struct platform_device_id mxs_gpio_ids[] = {
201 {
202 .name = "imx23-gpio",
203 .driver_data = IMX23_GPIO,
204 }, {
205 .name = "imx28-gpio",
206 .driver_data = IMX28_GPIO,
207 }, {
208
209 }
210};
211MODULE_DEVICE_TABLE(platform, mxs_gpio_ids);
212
213static const struct of_device_id mxs_gpio_dt_ids[] = {
214 { .compatible = "fsl,imx23-gpio", .data = (void *) IMX23_GPIO, },
215 { .compatible = "fsl,imx28-gpio", .data = (void *) IMX28_GPIO, },
216 { }
217};
218MODULE_DEVICE_TABLE(of, mxs_gpio_dt_ids);
219
220static int __devinit mxs_gpio_probe(struct platform_device *pdev)
221{
222 const struct of_device_id *of_id =
223 of_match_device(mxs_gpio_dt_ids, &pdev->dev);
224 struct device_node *np = pdev->dev.of_node;
225 struct device_node *parent;
226 static void __iomem *base;
227 struct mxs_gpio_port *port;
228 struct resource *iores = NULL;
229 int err;
230
231 port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
232 if (!port)
233 return -ENOMEM;
234
235 if (np) {
236 port->id = of_alias_get_id(np, "gpio");
237 if (port->id < 0)
238 return port->id;
239 port->devid = (enum mxs_gpio_id) of_id->data;
240 } else {
241 port->id = pdev->id;
242 port->devid = pdev->id_entry->driver_data;
243 }
244 port->virtual_irq_start = MXS_GPIO_IRQ_START + port->id * 32;
245
246 port->irq = platform_get_irq(pdev, 0);
247 if (port->irq < 0)
248 return port->irq;
249
250
251
252
253
254 if (!base) {
255 if (np) {
256 parent = of_get_parent(np);
257 base = of_iomap(parent, 0);
258 of_node_put(parent);
259 } else {
260 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
261 base = devm_request_and_ioremap(&pdev->dev, iores);
262 }
263 if (!base)
264 return -EADDRNOTAVAIL;
265 }
266 port->base = base;
267
268
269
270
271
272 writel(~0U, port->base + PINCTRL_PIN2IRQ(port));
273 writel(0, port->base + PINCTRL_IRQEN(port));
274
275
276 writel(~0U, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
277
278
279 mxs_gpio_init_gc(port);
280
281
282 irq_set_chained_handler(port->irq, mxs_gpio_irq_handler);
283 irq_set_handler_data(port->irq, port);
284
285 err = bgpio_init(&port->bgc, &pdev->dev, 4,
286 port->base + PINCTRL_DIN(port),
287 port->base + PINCTRL_DOUT(port), NULL,
288 port->base + PINCTRL_DOE(port), NULL, 0);
289 if (err)
290 return err;
291
292 port->bgc.gc.to_irq = mxs_gpio_to_irq;
293 port->bgc.gc.base = port->id * 32;
294
295 err = gpiochip_add(&port->bgc.gc);
296 if (err) {
297 bgpio_remove(&port->bgc);
298 return err;
299 }
300
301 return 0;
302}
303
304static struct platform_driver mxs_gpio_driver = {
305 .driver = {
306 .name = "gpio-mxs",
307 .owner = THIS_MODULE,
308 .of_match_table = mxs_gpio_dt_ids,
309 },
310 .probe = mxs_gpio_probe,
311 .id_table = mxs_gpio_ids,
312};
313
314static int __init mxs_gpio_init(void)
315{
316 return platform_driver_register(&mxs_gpio_driver);
317}
318postcore_initcall(mxs_gpio_init);
319
320MODULE_AUTHOR("Freescale Semiconductor, "
321 "Daniel Mack <danielncaiaq.de>, "
322 "Juergen Beisert <kernel@pengutronix.de>");
323MODULE_DESCRIPTION("Freescale MXS GPIO");
324MODULE_LICENSE("GPL");
325
