Commit | Line | Data |
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339e7730 FE |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | // | |
b0d47318 | 3 | // MXS GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de> |
339e7730 FE |
4 | // Copyright 2008 Juergen Beisert, kernel@pengutronix.de |
5 | // | |
6 | // Based on code from Freescale, | |
7 | // Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved. | |
fba311fc | 8 | |
641d0342 | 9 | #include <linux/err.h> |
fba311fc SG |
10 | #include <linux/init.h> |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/irq.h> | |
0b76c541 | 14 | #include <linux/irqdomain.h> |
4052d45e SG |
15 | #include <linux/of.h> |
16 | #include <linux/of_address.h> | |
8d7cf837 SG |
17 | #include <linux/platform_device.h> |
18 | #include <linux/slab.h> | |
0f4630f3 | 19 | #include <linux/gpio/driver.h> |
bb207ef1 | 20 | #include <linux/module.h> |
fba311fc | 21 | |
8d7cf837 SG |
22 | #define MXS_SET 0x4 |
23 | #define MXS_CLR 0x8 | |
fba311fc | 24 | |
164387d2 SG |
25 | #define PINCTRL_DOUT(p) ((is_imx23_gpio(p) ? 0x0500 : 0x0700) + (p->id) * 0x10) |
26 | #define PINCTRL_DIN(p) ((is_imx23_gpio(p) ? 0x0600 : 0x0900) + (p->id) * 0x10) | |
27 | #define PINCTRL_DOE(p) ((is_imx23_gpio(p) ? 0x0700 : 0x0b00) + (p->id) * 0x10) | |
28 | #define PINCTRL_PIN2IRQ(p) ((is_imx23_gpio(p) ? 0x0800 : 0x1000) + (p->id) * 0x10) | |
29 | #define PINCTRL_IRQEN(p) ((is_imx23_gpio(p) ? 0x0900 : 0x1100) + (p->id) * 0x10) | |
30 | #define PINCTRL_IRQLEV(p) ((is_imx23_gpio(p) ? 0x0a00 : 0x1200) + (p->id) * 0x10) | |
31 | #define PINCTRL_IRQPOL(p) ((is_imx23_gpio(p) ? 0x0b00 : 0x1300) + (p->id) * 0x10) | |
32 | #define PINCTRL_IRQSTAT(p) ((is_imx23_gpio(p) ? 0x0c00 : 0x1400) + (p->id) * 0x10) | |
fba311fc SG |
33 | |
34 | #define GPIO_INT_FALL_EDGE 0x0 | |
35 | #define GPIO_INT_LOW_LEV 0x1 | |
36 | #define GPIO_INT_RISE_EDGE 0x2 | |
37 | #define GPIO_INT_HIGH_LEV 0x3 | |
38 | #define GPIO_INT_LEV_MASK (1 << 0) | |
39 | #define GPIO_INT_POL_MASK (1 << 1) | |
40 | ||
164387d2 SG |
41 | enum mxs_gpio_id { |
42 | IMX23_GPIO, | |
43 | IMX28_GPIO, | |
44 | }; | |
45 | ||
7b2fa570 GL |
46 | struct mxs_gpio_port { |
47 | void __iomem *base; | |
48 | int id; | |
49 | int irq; | |
0b76c541 | 50 | struct irq_domain *domain; |
0f4630f3 | 51 | struct gpio_chip gc; |
5751d3dc | 52 | struct device *dev; |
164387d2 | 53 | enum mxs_gpio_id devid; |
66d7990e | 54 | u32 both_edges; |
7b2fa570 GL |
55 | }; |
56 | ||
164387d2 SG |
57 | static inline int is_imx23_gpio(struct mxs_gpio_port *port) |
58 | { | |
59 | return port->devid == IMX23_GPIO; | |
60 | } | |
61 | ||
fba311fc SG |
62 | /* Note: This driver assumes 32 GPIOs are handled in one register */ |
63 | ||
bf0c1118 | 64 | static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type) |
fba311fc | 65 | { |
66d7990e | 66 | u32 val; |
0b76c541 | 67 | u32 pin_mask = 1 << d->hwirq; |
498c17cf | 68 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); |
f08ea3cc | 69 | struct irq_chip_type *ct = irq_data_get_chip_type(d); |
498c17cf | 70 | struct mxs_gpio_port *port = gc->private; |
fba311fc SG |
71 | void __iomem *pin_addr; |
72 | int edge; | |
73 | ||
f08ea3cc SH |
74 | if (!(ct->type & type)) |
75 | if (irq_setup_alt_chip(d, type)) | |
76 | return -EINVAL; | |
77 | ||
66d7990e | 78 | port->both_edges &= ~pin_mask; |
fba311fc | 79 | switch (type) { |
66d7990e | 80 | case IRQ_TYPE_EDGE_BOTH: |
f0df462f | 81 | val = readl(port->base + PINCTRL_DIN(port)) & pin_mask; |
66d7990e GGM |
82 | if (val) |
83 | edge = GPIO_INT_FALL_EDGE; | |
84 | else | |
85 | edge = GPIO_INT_RISE_EDGE; | |
86 | port->both_edges |= pin_mask; | |
87 | break; | |
fba311fc SG |
88 | case IRQ_TYPE_EDGE_RISING: |
89 | edge = GPIO_INT_RISE_EDGE; | |
90 | break; | |
91 | case IRQ_TYPE_EDGE_FALLING: | |
92 | edge = GPIO_INT_FALL_EDGE; | |
93 | break; | |
94 | case IRQ_TYPE_LEVEL_LOW: | |
95 | edge = GPIO_INT_LOW_LEV; | |
96 | break; | |
97 | case IRQ_TYPE_LEVEL_HIGH: | |
98 | edge = GPIO_INT_HIGH_LEV; | |
99 | break; | |
100 | default: | |
101 | return -EINVAL; | |
102 | } | |
103 | ||
104 | /* set level or edge */ | |
164387d2 | 105 | pin_addr = port->base + PINCTRL_IRQLEV(port); |
f08ea3cc | 106 | if (edge & GPIO_INT_LEV_MASK) { |
8d7cf837 | 107 | writel(pin_mask, pin_addr + MXS_SET); |
f08ea3cc SH |
108 | writel(pin_mask, port->base + PINCTRL_IRQEN(port) + MXS_SET); |
109 | } else { | |
8d7cf837 | 110 | writel(pin_mask, pin_addr + MXS_CLR); |
f08ea3cc SH |
111 | writel(pin_mask, port->base + PINCTRL_PIN2IRQ(port) + MXS_SET); |
112 | } | |
fba311fc SG |
113 | |
114 | /* set polarity */ | |
164387d2 | 115 | pin_addr = port->base + PINCTRL_IRQPOL(port); |
fba311fc | 116 | if (edge & GPIO_INT_POL_MASK) |
8d7cf837 | 117 | writel(pin_mask, pin_addr + MXS_SET); |
fba311fc | 118 | else |
8d7cf837 | 119 | writel(pin_mask, pin_addr + MXS_CLR); |
fba311fc | 120 | |
2bee9e06 | 121 | writel(pin_mask, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR); |
fba311fc SG |
122 | |
123 | return 0; | |
124 | } | |
125 | ||
66d7990e GGM |
126 | static void mxs_flip_edge(struct mxs_gpio_port *port, u32 gpio) |
127 | { | |
128 | u32 bit, val, edge; | |
129 | void __iomem *pin_addr; | |
130 | ||
131 | bit = 1 << gpio; | |
132 | ||
133 | pin_addr = port->base + PINCTRL_IRQPOL(port); | |
134 | val = readl(pin_addr); | |
135 | edge = val & bit; | |
136 | ||
137 | if (edge) | |
138 | writel(bit, pin_addr + MXS_CLR); | |
139 | else | |
140 | writel(bit, pin_addr + MXS_SET); | |
141 | } | |
142 | ||
fba311fc | 143 | /* MXS has one interrupt *per* gpio port */ |
bd0b9ac4 | 144 | static void mxs_gpio_irq_handler(struct irq_desc *desc) |
fba311fc SG |
145 | { |
146 | u32 irq_stat; | |
476f8b4c | 147 | struct mxs_gpio_port *port = irq_desc_get_handler_data(desc); |
fba311fc | 148 | |
1f6b5dd4 UKK |
149 | desc->irq_data.chip->irq_ack(&desc->irq_data); |
150 | ||
164387d2 SG |
151 | irq_stat = readl(port->base + PINCTRL_IRQSTAT(port)) & |
152 | readl(port->base + PINCTRL_IRQEN(port)); | |
fba311fc SG |
153 | |
154 | while (irq_stat != 0) { | |
155 | int irqoffset = fls(irq_stat) - 1; | |
66d7990e GGM |
156 | if (port->both_edges & (1 << irqoffset)) |
157 | mxs_flip_edge(port, irqoffset); | |
158 | ||
dbd1c54f | 159 | generic_handle_domain_irq(port->domain, irqoffset); |
fba311fc SG |
160 | irq_stat &= ~(1 << irqoffset); |
161 | } | |
162 | } | |
163 | ||
164 | /* | |
165 | * Set interrupt number "irq" in the GPIO as a wake-up source. | |
166 | * While system is running, all registered GPIO interrupts need to have | |
167 | * wake-up enabled. When system is suspended, only selected GPIO interrupts | |
168 | * need to have wake-up enabled. | |
169 | * @param irq interrupt source number | |
170 | * @param enable enable as wake-up if equal to non-zero | |
171 | * @return This function returns 0 on success. | |
172 | */ | |
bf0c1118 | 173 | static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable) |
fba311fc | 174 | { |
498c17cf SG |
175 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); |
176 | struct mxs_gpio_port *port = gc->private; | |
fba311fc | 177 | |
6161715e SG |
178 | if (enable) |
179 | enable_irq_wake(port->irq); | |
180 | else | |
181 | disable_irq_wake(port->irq); | |
fba311fc SG |
182 | |
183 | return 0; | |
184 | } | |
185 | ||
abc8d583 | 186 | static int mxs_gpio_init_gc(struct mxs_gpio_port *port, int irq_base) |
498c17cf SG |
187 | { |
188 | struct irq_chip_generic *gc; | |
189 | struct irq_chip_type *ct; | |
5751d3dc | 190 | int rv; |
498c17cf | 191 | |
5751d3dc BG |
192 | gc = devm_irq_alloc_generic_chip(port->dev, "gpio-mxs", 2, irq_base, |
193 | port->base, handle_level_irq); | |
1bbc557d PF |
194 | if (!gc) |
195 | return -ENOMEM; | |
196 | ||
498c17cf SG |
197 | gc->private = port; |
198 | ||
f08ea3cc SH |
199 | ct = &gc->chip_types[0]; |
200 | ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW; | |
201 | ct->chip.irq_ack = irq_gc_ack_set_bit; | |
202 | ct->chip.irq_mask = irq_gc_mask_disable_reg; | |
203 | ct->chip.irq_unmask = irq_gc_unmask_enable_reg; | |
204 | ct->chip.irq_set_type = mxs_gpio_set_irq_type; | |
205 | ct->chip.irq_set_wake = mxs_gpio_set_wake_irq; | |
206 | ct->chip.flags = IRQCHIP_SET_TYPE_MASKED; | |
207 | ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR; | |
208 | ct->regs.enable = PINCTRL_PIN2IRQ(port) + MXS_SET; | |
209 | ct->regs.disable = PINCTRL_PIN2IRQ(port) + MXS_CLR; | |
210 | ||
211 | ct = &gc->chip_types[1]; | |
212 | ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; | |
591567a5 | 213 | ct->chip.irq_ack = irq_gc_ack_set_bit; |
66a37c3b SH |
214 | ct->chip.irq_mask = irq_gc_mask_disable_reg; |
215 | ct->chip.irq_unmask = irq_gc_unmask_enable_reg; | |
498c17cf | 216 | ct->chip.irq_set_type = mxs_gpio_set_irq_type; |
591567a5 | 217 | ct->chip.irq_set_wake = mxs_gpio_set_wake_irq; |
f08ea3cc | 218 | ct->chip.flags = IRQCHIP_SET_TYPE_MASKED; |
164387d2 | 219 | ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR; |
66a37c3b SH |
220 | ct->regs.enable = PINCTRL_IRQEN(port) + MXS_SET; |
221 | ct->regs.disable = PINCTRL_IRQEN(port) + MXS_CLR; | |
f08ea3cc | 222 | ct->handler = handle_level_irq; |
498c17cf | 223 | |
5751d3dc BG |
224 | rv = devm_irq_setup_generic_chip(port->dev, gc, IRQ_MSK(32), |
225 | IRQ_GC_INIT_NESTED_LOCK, | |
226 | IRQ_NOREQUEST, 0); | |
1bbc557d | 227 | |
5751d3dc | 228 | return rv; |
498c17cf | 229 | } |
fba311fc | 230 | |
cdee1d62 | 231 | static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned int offset) |
fba311fc | 232 | { |
0f4630f3 | 233 | struct mxs_gpio_port *port = gpiochip_get_data(gc); |
fba311fc | 234 | |
0b76c541 | 235 | return irq_find_mapping(port->domain, offset); |
fba311fc SG |
236 | } |
237 | ||
cdee1d62 | 238 | static int mxs_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) |
c8aaa1bf | 239 | { |
0f4630f3 | 240 | struct mxs_gpio_port *port = gpiochip_get_data(gc); |
c8aaa1bf JU |
241 | u32 mask = 1 << offset; |
242 | u32 dir; | |
243 | ||
244 | dir = readl(port->base + PINCTRL_DOE(port)); | |
e42615ec MV |
245 | if (dir & mask) |
246 | return GPIO_LINE_DIRECTION_OUT; | |
247 | ||
248 | return GPIO_LINE_DIRECTION_IN; | |
c8aaa1bf JU |
249 | } |
250 | ||
4052d45e SG |
251 | static const struct of_device_id mxs_gpio_dt_ids[] = { |
252 | { .compatible = "fsl,imx23-gpio", .data = (void *) IMX23_GPIO, }, | |
253 | { .compatible = "fsl,imx28-gpio", .data = (void *) IMX28_GPIO, }, | |
254 | { /* sentinel */ } | |
255 | }; | |
256 | MODULE_DEVICE_TABLE(of, mxs_gpio_dt_ids); | |
257 | ||
3836309d | 258 | static int mxs_gpio_probe(struct platform_device *pdev) |
fba311fc | 259 | { |
4052d45e SG |
260 | struct device_node *np = pdev->dev.of_node; |
261 | struct device_node *parent; | |
8d7cf837 SG |
262 | static void __iomem *base; |
263 | struct mxs_gpio_port *port; | |
0b76c541 | 264 | int irq_base; |
498c17cf | 265 | int err; |
8d7cf837 | 266 | |
940a4f7b | 267 | port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL); |
8d7cf837 SG |
268 | if (!port) |
269 | return -ENOMEM; | |
270 | ||
99357127 FE |
271 | port->id = of_alias_get_id(np, "gpio"); |
272 | if (port->id < 0) | |
273 | return port->id; | |
b7df0f34 | 274 | port->devid = (uintptr_t)of_device_get_match_data(&pdev->dev); |
5751d3dc | 275 | port->dev = &pdev->dev; |
940a4f7b SG |
276 | port->irq = platform_get_irq(pdev, 0); |
277 | if (port->irq < 0) | |
278 | return port->irq; | |
279 | ||
8d7cf837 SG |
280 | /* |
281 | * map memory region only once, as all the gpio ports | |
282 | * share the same one | |
283 | */ | |
284 | if (!base) { | |
99357127 FE |
285 | parent = of_get_parent(np); |
286 | base = of_iomap(parent, 0); | |
287 | of_node_put(parent); | |
288 | if (!base) | |
289 | return -EADDRNOTAVAIL; | |
8d7cf837 SG |
290 | } |
291 | port->base = base; | |
fba311fc | 292 | |
f08ea3cc SH |
293 | /* initially disable the interrupts */ |
294 | writel(0, port->base + PINCTRL_PIN2IRQ(port)); | |
164387d2 | 295 | writel(0, port->base + PINCTRL_IRQEN(port)); |
fba311fc | 296 | |
8d7cf837 | 297 | /* clear address has to be used to clear IRQSTAT bits */ |
164387d2 | 298 | writel(~0U, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR); |
fba311fc | 299 | |
8514b543 | 300 | irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, 32, numa_node_id()); |
44df0819 AY |
301 | if (irq_base < 0) { |
302 | err = irq_base; | |
303 | goto out_iounmap; | |
304 | } | |
0b76c541 SG |
305 | |
306 | port->domain = irq_domain_add_legacy(np, 32, irq_base, 0, | |
307 | &irq_domain_simple_ops, NULL); | |
308 | if (!port->domain) { | |
309 | err = -ENODEV; | |
8514b543 | 310 | goto out_iounmap; |
0b76c541 SG |
311 | } |
312 | ||
498c17cf | 313 | /* gpio-mxs can be a generic irq chip */ |
1bbc557d PF |
314 | err = mxs_gpio_init_gc(port, irq_base); |
315 | if (err < 0) | |
316 | goto out_irqdomain_remove; | |
fba311fc | 317 | |
8d7cf837 | 318 | /* setup one handler for each entry */ |
a44735f4 RK |
319 | irq_set_chained_handler_and_data(port->irq, mxs_gpio_irq_handler, |
320 | port); | |
fba311fc | 321 | |
0f4630f3 | 322 | err = bgpio_init(&port->gc, &pdev->dev, 4, |
164387d2 | 323 | port->base + PINCTRL_DIN(port), |
90dae4eb MR |
324 | port->base + PINCTRL_DOUT(port) + MXS_SET, |
325 | port->base + PINCTRL_DOUT(port) + MXS_CLR, | |
84a442b9 | 326 | port->base + PINCTRL_DOE(port), NULL, 0); |
8d7cf837 | 327 | if (err) |
0f4630f3 | 328 | goto out_irqdomain_remove; |
fba311fc | 329 | |
0f4630f3 LW |
330 | port->gc.to_irq = mxs_gpio_to_irq; |
331 | port->gc.get_direction = mxs_gpio_get_direction; | |
332 | port->gc.base = port->id * 32; | |
06f88a8a | 333 | |
0f4630f3 | 334 | err = gpiochip_add_data(&port->gc, port); |
0b76c541 | 335 | if (err) |
0f4630f3 | 336 | goto out_irqdomain_remove; |
06f88a8a | 337 | |
8d7cf837 | 338 | return 0; |
0b76c541 | 339 | |
1bbc557d PF |
340 | out_irqdomain_remove: |
341 | irq_domain_remove(port->domain); | |
44df0819 AY |
342 | out_iounmap: |
343 | iounmap(port->base); | |
0b76c541 | 344 | return err; |
ef19660b | 345 | } |
8d7cf837 SG |
346 | |
347 | static struct platform_driver mxs_gpio_driver = { | |
348 | .driver = { | |
349 | .name = "gpio-mxs", | |
4052d45e | 350 | .of_match_table = mxs_gpio_dt_ids, |
60909ec9 | 351 | .suppress_bind_attrs = true, |
8d7cf837 SG |
352 | }, |
353 | .probe = mxs_gpio_probe, | |
fba311fc | 354 | }; |
ef19660b | 355 | |
8d7cf837 | 356 | static int __init mxs_gpio_init(void) |
ef19660b | 357 | { |
8d7cf837 | 358 | return platform_driver_register(&mxs_gpio_driver); |
ef19660b | 359 | } |
8d7cf837 SG |
360 | postcore_initcall(mxs_gpio_init); |
361 | ||
362 | MODULE_AUTHOR("Freescale Semiconductor, " | |
363 | "Daniel Mack <danielncaiaq.de>, " | |
364 | "Juergen Beisert <kernel@pengutronix.de>"); | |
365 | MODULE_DESCRIPTION("Freescale MXS GPIO"); |