Commit | Line | Data |
---|---|---|
07bd1a6c JB |
1 | /* |
2 | * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de> | |
3 | * Copyright 2008 Juergen Beisert, kernel@pengutronix.de | |
4 | * | |
2c8d6c86 PG |
5 | * Based on code from Freescale Semiconductor, |
6 | * Authors: Daniel Mack, Juergen Beisert. | |
e24798e6 | 7 | * Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved. |
07bd1a6c JB |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version 2 | |
12 | * of the License, or (at your option) any later version. | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
21 | */ | |
22 | ||
2808801a | 23 | #include <linux/clk.h> |
18f92b19 | 24 | #include <linux/err.h> |
07bd1a6c | 25 | #include <linux/init.h> |
a3484ffd | 26 | #include <linux/interrupt.h> |
07bd1a6c JB |
27 | #include <linux/io.h> |
28 | #include <linux/irq.h> | |
1ab7ef15 | 29 | #include <linux/irqdomain.h> |
de88cbb7 | 30 | #include <linux/irqchip/chained_irq.h> |
b78d8e59 SG |
31 | #include <linux/platform_device.h> |
32 | #include <linux/slab.h> | |
0f4630f3 | 33 | #include <linux/gpio/driver.h> |
8937cb60 SG |
34 | #include <linux/of.h> |
35 | #include <linux/of_device.h> | |
16c3bd35 | 36 | #include <linux/bug.h> |
07bd1a6c | 37 | |
e7fc6ae7 SG |
38 | enum mxc_gpio_hwtype { |
39 | IMX1_GPIO, /* runs on i.mx1 */ | |
40 | IMX21_GPIO, /* runs on i.mx21 and i.mx27 */ | |
aeb27748 BT |
41 | IMX31_GPIO, /* runs on i.mx31 */ |
42 | IMX35_GPIO, /* runs on all other i.mx */ | |
e7fc6ae7 SG |
43 | }; |
44 | ||
45 | /* device type dependent stuff */ | |
46 | struct mxc_gpio_hwdata { | |
47 | unsigned dr_reg; | |
48 | unsigned gdir_reg; | |
49 | unsigned psr_reg; | |
50 | unsigned icr1_reg; | |
51 | unsigned icr2_reg; | |
52 | unsigned imr_reg; | |
53 | unsigned isr_reg; | |
aeb27748 | 54 | int edge_sel_reg; |
e7fc6ae7 SG |
55 | unsigned low_level; |
56 | unsigned high_level; | |
57 | unsigned rise_edge; | |
58 | unsigned fall_edge; | |
59 | }; | |
60 | ||
b78d8e59 SG |
61 | struct mxc_gpio_port { |
62 | struct list_head node; | |
63 | void __iomem *base; | |
2808801a | 64 | struct clk *clk; |
b78d8e59 SG |
65 | int irq; |
66 | int irq_high; | |
1ab7ef15 | 67 | struct irq_domain *domain; |
0f4630f3 | 68 | struct gpio_chip gc; |
db5270ac | 69 | struct device *dev; |
b78d8e59 | 70 | u32 both_edges; |
b78d8e59 SG |
71 | }; |
72 | ||
e7fc6ae7 SG |
73 | static struct mxc_gpio_hwdata imx1_imx21_gpio_hwdata = { |
74 | .dr_reg = 0x1c, | |
75 | .gdir_reg = 0x00, | |
76 | .psr_reg = 0x24, | |
77 | .icr1_reg = 0x28, | |
78 | .icr2_reg = 0x2c, | |
79 | .imr_reg = 0x30, | |
80 | .isr_reg = 0x34, | |
aeb27748 | 81 | .edge_sel_reg = -EINVAL, |
e7fc6ae7 SG |
82 | .low_level = 0x03, |
83 | .high_level = 0x02, | |
84 | .rise_edge = 0x00, | |
85 | .fall_edge = 0x01, | |
86 | }; | |
87 | ||
88 | static struct mxc_gpio_hwdata imx31_gpio_hwdata = { | |
89 | .dr_reg = 0x00, | |
90 | .gdir_reg = 0x04, | |
91 | .psr_reg = 0x08, | |
92 | .icr1_reg = 0x0c, | |
93 | .icr2_reg = 0x10, | |
94 | .imr_reg = 0x14, | |
95 | .isr_reg = 0x18, | |
aeb27748 BT |
96 | .edge_sel_reg = -EINVAL, |
97 | .low_level = 0x00, | |
98 | .high_level = 0x01, | |
99 | .rise_edge = 0x02, | |
100 | .fall_edge = 0x03, | |
101 | }; | |
102 | ||
103 | static struct mxc_gpio_hwdata imx35_gpio_hwdata = { | |
104 | .dr_reg = 0x00, | |
105 | .gdir_reg = 0x04, | |
106 | .psr_reg = 0x08, | |
107 | .icr1_reg = 0x0c, | |
108 | .icr2_reg = 0x10, | |
109 | .imr_reg = 0x14, | |
110 | .isr_reg = 0x18, | |
111 | .edge_sel_reg = 0x1c, | |
e7fc6ae7 SG |
112 | .low_level = 0x00, |
113 | .high_level = 0x01, | |
114 | .rise_edge = 0x02, | |
115 | .fall_edge = 0x03, | |
116 | }; | |
117 | ||
118 | static enum mxc_gpio_hwtype mxc_gpio_hwtype; | |
119 | static struct mxc_gpio_hwdata *mxc_gpio_hwdata; | |
120 | ||
121 | #define GPIO_DR (mxc_gpio_hwdata->dr_reg) | |
122 | #define GPIO_GDIR (mxc_gpio_hwdata->gdir_reg) | |
123 | #define GPIO_PSR (mxc_gpio_hwdata->psr_reg) | |
124 | #define GPIO_ICR1 (mxc_gpio_hwdata->icr1_reg) | |
125 | #define GPIO_ICR2 (mxc_gpio_hwdata->icr2_reg) | |
126 | #define GPIO_IMR (mxc_gpio_hwdata->imr_reg) | |
127 | #define GPIO_ISR (mxc_gpio_hwdata->isr_reg) | |
aeb27748 | 128 | #define GPIO_EDGE_SEL (mxc_gpio_hwdata->edge_sel_reg) |
e7fc6ae7 SG |
129 | |
130 | #define GPIO_INT_LOW_LEV (mxc_gpio_hwdata->low_level) | |
131 | #define GPIO_INT_HIGH_LEV (mxc_gpio_hwdata->high_level) | |
132 | #define GPIO_INT_RISE_EDGE (mxc_gpio_hwdata->rise_edge) | |
133 | #define GPIO_INT_FALL_EDGE (mxc_gpio_hwdata->fall_edge) | |
aeb27748 | 134 | #define GPIO_INT_BOTH_EDGES 0x4 |
e7fc6ae7 | 135 | |
f4f79d40 | 136 | static const struct platform_device_id mxc_gpio_devtype[] = { |
e7fc6ae7 SG |
137 | { |
138 | .name = "imx1-gpio", | |
139 | .driver_data = IMX1_GPIO, | |
140 | }, { | |
141 | .name = "imx21-gpio", | |
142 | .driver_data = IMX21_GPIO, | |
143 | }, { | |
144 | .name = "imx31-gpio", | |
145 | .driver_data = IMX31_GPIO, | |
aeb27748 BT |
146 | }, { |
147 | .name = "imx35-gpio", | |
148 | .driver_data = IMX35_GPIO, | |
e7fc6ae7 SG |
149 | }, { |
150 | /* sentinel */ | |
151 | } | |
152 | }; | |
153 | ||
8937cb60 SG |
154 | static const struct of_device_id mxc_gpio_dt_ids[] = { |
155 | { .compatible = "fsl,imx1-gpio", .data = &mxc_gpio_devtype[IMX1_GPIO], }, | |
156 | { .compatible = "fsl,imx21-gpio", .data = &mxc_gpio_devtype[IMX21_GPIO], }, | |
157 | { .compatible = "fsl,imx31-gpio", .data = &mxc_gpio_devtype[IMX31_GPIO], }, | |
aeb27748 | 158 | { .compatible = "fsl,imx35-gpio", .data = &mxc_gpio_devtype[IMX35_GPIO], }, |
8937cb60 SG |
159 | { /* sentinel */ } |
160 | }; | |
161 | ||
b78d8e59 SG |
162 | /* |
163 | * MX2 has one interrupt *for all* gpio ports. The list is used | |
164 | * to save the references to all ports, so that mx2_gpio_irq_handler | |
165 | * can walk through all interrupt status registers. | |
166 | */ | |
167 | static LIST_HEAD(mxc_gpio_ports); | |
07bd1a6c JB |
168 | |
169 | /* Note: This driver assumes 32 GPIOs are handled in one register */ | |
170 | ||
4d93579f | 171 | static int gpio_set_irq_type(struct irq_data *d, u32 type) |
07bd1a6c | 172 | { |
e4ea9333 SG |
173 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); |
174 | struct mxc_gpio_port *port = gc->private; | |
07bd1a6c | 175 | u32 bit, val; |
1ab7ef15 | 176 | u32 gpio_idx = d->hwirq; |
07bd1a6c JB |
177 | int edge; |
178 | void __iomem *reg = port->base; | |
179 | ||
1ab7ef15 | 180 | port->both_edges &= ~(1 << gpio_idx); |
07bd1a6c | 181 | switch (type) { |
6cab4860 | 182 | case IRQ_TYPE_EDGE_RISING: |
07bd1a6c JB |
183 | edge = GPIO_INT_RISE_EDGE; |
184 | break; | |
6cab4860 | 185 | case IRQ_TYPE_EDGE_FALLING: |
07bd1a6c JB |
186 | edge = GPIO_INT_FALL_EDGE; |
187 | break; | |
910862ec | 188 | case IRQ_TYPE_EDGE_BOTH: |
aeb27748 BT |
189 | if (GPIO_EDGE_SEL >= 0) { |
190 | edge = GPIO_INT_BOTH_EDGES; | |
910862ec | 191 | } else { |
8d0bd9a5 | 192 | val = port->gc.get(&port->gc, gpio_idx); |
aeb27748 BT |
193 | if (val) { |
194 | edge = GPIO_INT_LOW_LEV; | |
8d0bd9a5 | 195 | pr_debug("mxc: set GPIO %d to low trigger\n", gpio_idx); |
aeb27748 BT |
196 | } else { |
197 | edge = GPIO_INT_HIGH_LEV; | |
8d0bd9a5 | 198 | pr_debug("mxc: set GPIO %d to high trigger\n", gpio_idx); |
aeb27748 | 199 | } |
f948ad07 | 200 | port->both_edges |= 1 << gpio_idx; |
910862ec | 201 | } |
910862ec | 202 | break; |
6cab4860 | 203 | case IRQ_TYPE_LEVEL_LOW: |
07bd1a6c JB |
204 | edge = GPIO_INT_LOW_LEV; |
205 | break; | |
6cab4860 | 206 | case IRQ_TYPE_LEVEL_HIGH: |
07bd1a6c JB |
207 | edge = GPIO_INT_HIGH_LEV; |
208 | break; | |
910862ec | 209 | default: |
07bd1a6c JB |
210 | return -EINVAL; |
211 | } | |
212 | ||
aeb27748 BT |
213 | if (GPIO_EDGE_SEL >= 0) { |
214 | val = readl(port->base + GPIO_EDGE_SEL); | |
215 | if (edge == GPIO_INT_BOTH_EDGES) | |
f948ad07 | 216 | writel(val | (1 << gpio_idx), |
aeb27748 BT |
217 | port->base + GPIO_EDGE_SEL); |
218 | else | |
f948ad07 | 219 | writel(val & ~(1 << gpio_idx), |
aeb27748 BT |
220 | port->base + GPIO_EDGE_SEL); |
221 | } | |
222 | ||
223 | if (edge != GPIO_INT_BOTH_EDGES) { | |
f948ad07 LT |
224 | reg += GPIO_ICR1 + ((gpio_idx & 0x10) >> 2); /* lower or upper register */ |
225 | bit = gpio_idx & 0xf; | |
aeb27748 BT |
226 | val = readl(reg) & ~(0x3 << (bit << 1)); |
227 | writel(val | (edge << (bit << 1)), reg); | |
228 | } | |
229 | ||
1ab7ef15 | 230 | writel(1 << gpio_idx, port->base + GPIO_ISR); |
07bd1a6c JB |
231 | |
232 | return 0; | |
233 | } | |
234 | ||
910862ec GL |
235 | static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio) |
236 | { | |
237 | void __iomem *reg = port->base; | |
238 | u32 bit, val; | |
239 | int edge; | |
240 | ||
241 | reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */ | |
242 | bit = gpio & 0xf; | |
b78d8e59 | 243 | val = readl(reg); |
910862ec GL |
244 | edge = (val >> (bit << 1)) & 3; |
245 | val &= ~(0x3 << (bit << 1)); | |
3d40f7fe | 246 | if (edge == GPIO_INT_HIGH_LEV) { |
910862ec GL |
247 | edge = GPIO_INT_LOW_LEV; |
248 | pr_debug("mxc: switch GPIO %d to low trigger\n", gpio); | |
3d40f7fe | 249 | } else if (edge == GPIO_INT_LOW_LEV) { |
910862ec GL |
250 | edge = GPIO_INT_HIGH_LEV; |
251 | pr_debug("mxc: switch GPIO %d to high trigger\n", gpio); | |
3d40f7fe | 252 | } else { |
910862ec GL |
253 | pr_err("mxc: invalid configuration for GPIO %d: %x\n", |
254 | gpio, edge); | |
255 | return; | |
256 | } | |
b78d8e59 | 257 | writel(val | (edge << (bit << 1)), reg); |
910862ec GL |
258 | } |
259 | ||
3621f188 | 260 | /* handle 32 interrupts in one status register */ |
07bd1a6c JB |
261 | static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat) |
262 | { | |
3621f188 UKK |
263 | while (irq_stat != 0) { |
264 | int irqoffset = fls(irq_stat) - 1; | |
07bd1a6c | 265 | |
3621f188 UKK |
266 | if (port->both_edges & (1 << irqoffset)) |
267 | mxc_flip_edge(port, irqoffset); | |
910862ec | 268 | |
1ab7ef15 | 269 | generic_handle_irq(irq_find_mapping(port->domain, irqoffset)); |
910862ec | 270 | |
3621f188 | 271 | irq_stat &= ~(1 << irqoffset); |
07bd1a6c JB |
272 | } |
273 | } | |
274 | ||
cfca8b53 | 275 | /* MX1 and MX3 has one interrupt *per* gpio port */ |
bd0b9ac4 | 276 | static void mx3_gpio_irq_handler(struct irq_desc *desc) |
07bd1a6c JB |
277 | { |
278 | u32 irq_stat; | |
476f8b4c JL |
279 | struct mxc_gpio_port *port = irq_desc_get_handler_data(desc); |
280 | struct irq_chip *chip = irq_desc_get_chip(desc); | |
0e44b6ec SG |
281 | |
282 | chained_irq_enter(chip, desc); | |
07bd1a6c | 283 | |
b78d8e59 | 284 | irq_stat = readl(port->base + GPIO_ISR) & readl(port->base + GPIO_IMR); |
e2c97e7f | 285 | |
07bd1a6c | 286 | mxc_gpio_irq_handler(port, irq_stat); |
0e44b6ec SG |
287 | |
288 | chained_irq_exit(chip, desc); | |
07bd1a6c | 289 | } |
07bd1a6c | 290 | |
07bd1a6c | 291 | /* MX2 has one interrupt *for all* gpio ports */ |
bd0b9ac4 | 292 | static void mx2_gpio_irq_handler(struct irq_desc *desc) |
07bd1a6c | 293 | { |
07bd1a6c | 294 | u32 irq_msk, irq_stat; |
b78d8e59 | 295 | struct mxc_gpio_port *port; |
476f8b4c | 296 | struct irq_chip *chip = irq_desc_get_chip(desc); |
c0e811d9 UKK |
297 | |
298 | chained_irq_enter(chip, desc); | |
07bd1a6c JB |
299 | |
300 | /* walk through all interrupt status registers */ | |
b78d8e59 SG |
301 | list_for_each_entry(port, &mxc_gpio_ports, node) { |
302 | irq_msk = readl(port->base + GPIO_IMR); | |
07bd1a6c JB |
303 | if (!irq_msk) |
304 | continue; | |
305 | ||
b78d8e59 | 306 | irq_stat = readl(port->base + GPIO_ISR) & irq_msk; |
07bd1a6c | 307 | if (irq_stat) |
b78d8e59 | 308 | mxc_gpio_irq_handler(port, irq_stat); |
07bd1a6c | 309 | } |
c0e811d9 | 310 | chained_irq_exit(chip, desc); |
07bd1a6c | 311 | } |
07bd1a6c | 312 | |
a3484ffd DN |
313 | /* |
314 | * Set interrupt number "irq" in the GPIO as a wake-up source. | |
315 | * While system is running, all registered GPIO interrupts need to have | |
316 | * wake-up enabled. When system is suspended, only selected GPIO interrupts | |
317 | * need to have wake-up enabled. | |
318 | * @param irq interrupt source number | |
319 | * @param enable enable as wake-up if equal to non-zero | |
320 | * @return This function returns 0 on success. | |
321 | */ | |
4d93579f | 322 | static int gpio_set_wake_irq(struct irq_data *d, u32 enable) |
a3484ffd | 323 | { |
e4ea9333 SG |
324 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); |
325 | struct mxc_gpio_port *port = gc->private; | |
1ab7ef15 | 326 | u32 gpio_idx = d->hwirq; |
77a4d757 | 327 | int ret; |
a3484ffd DN |
328 | |
329 | if (enable) { | |
330 | if (port->irq_high && (gpio_idx >= 16)) | |
77a4d757 | 331 | ret = enable_irq_wake(port->irq_high); |
a3484ffd | 332 | else |
77a4d757 | 333 | ret = enable_irq_wake(port->irq); |
a3484ffd DN |
334 | } else { |
335 | if (port->irq_high && (gpio_idx >= 16)) | |
77a4d757 | 336 | ret = disable_irq_wake(port->irq_high); |
a3484ffd | 337 | else |
77a4d757 | 338 | ret = disable_irq_wake(port->irq); |
a3484ffd DN |
339 | } |
340 | ||
77a4d757 | 341 | return ret; |
a3484ffd DN |
342 | } |
343 | ||
9e26b0b1 | 344 | static int mxc_gpio_init_gc(struct mxc_gpio_port *port, int irq_base) |
e4ea9333 SG |
345 | { |
346 | struct irq_chip_generic *gc; | |
347 | struct irq_chip_type *ct; | |
db5270ac | 348 | int rv; |
e4ea9333 | 349 | |
db5270ac BG |
350 | gc = devm_irq_alloc_generic_chip(port->dev, "gpio-mxc", 1, irq_base, |
351 | port->base, handle_level_irq); | |
9e26b0b1 PF |
352 | if (!gc) |
353 | return -ENOMEM; | |
e4ea9333 SG |
354 | gc->private = port; |
355 | ||
356 | ct = gc->chip_types; | |
591567a5 | 357 | ct->chip.irq_ack = irq_gc_ack_set_bit; |
e4ea9333 SG |
358 | ct->chip.irq_mask = irq_gc_mask_clr_bit; |
359 | ct->chip.irq_unmask = irq_gc_mask_set_bit; | |
360 | ct->chip.irq_set_type = gpio_set_irq_type; | |
591567a5 | 361 | ct->chip.irq_set_wake = gpio_set_wake_irq; |
952cfbd3 | 362 | ct->chip.flags = IRQCHIP_MASK_ON_SUSPEND; |
e4ea9333 SG |
363 | ct->regs.ack = GPIO_ISR; |
364 | ct->regs.mask = GPIO_IMR; | |
365 | ||
db5270ac BG |
366 | rv = devm_irq_setup_generic_chip(port->dev, gc, IRQ_MSK(32), |
367 | IRQ_GC_INIT_NESTED_LOCK, | |
368 | IRQ_NOREQUEST, 0); | |
9e26b0b1 | 369 | |
db5270ac | 370 | return rv; |
e4ea9333 | 371 | } |
b5eee2fd | 372 | |
3836309d | 373 | static void mxc_gpio_get_hw(struct platform_device *pdev) |
e7fc6ae7 | 374 | { |
8937cb60 SG |
375 | const struct of_device_id *of_id = |
376 | of_match_device(mxc_gpio_dt_ids, &pdev->dev); | |
377 | enum mxc_gpio_hwtype hwtype; | |
378 | ||
379 | if (of_id) | |
380 | pdev->id_entry = of_id->data; | |
381 | hwtype = pdev->id_entry->driver_data; | |
e7fc6ae7 SG |
382 | |
383 | if (mxc_gpio_hwtype) { | |
384 | /* | |
385 | * The driver works with a reasonable presupposition, | |
386 | * that is all gpio ports must be the same type when | |
387 | * running on one soc. | |
388 | */ | |
389 | BUG_ON(mxc_gpio_hwtype != hwtype); | |
390 | return; | |
391 | } | |
392 | ||
aeb27748 BT |
393 | if (hwtype == IMX35_GPIO) |
394 | mxc_gpio_hwdata = &imx35_gpio_hwdata; | |
395 | else if (hwtype == IMX31_GPIO) | |
e7fc6ae7 SG |
396 | mxc_gpio_hwdata = &imx31_gpio_hwdata; |
397 | else | |
398 | mxc_gpio_hwdata = &imx1_imx21_gpio_hwdata; | |
399 | ||
400 | mxc_gpio_hwtype = hwtype; | |
401 | } | |
402 | ||
09ad8039 SG |
403 | static int mxc_gpio_to_irq(struct gpio_chip *gc, unsigned offset) |
404 | { | |
0f4630f3 | 405 | struct mxc_gpio_port *port = gpiochip_get_data(gc); |
09ad8039 | 406 | |
1ab7ef15 | 407 | return irq_find_mapping(port->domain, offset); |
09ad8039 SG |
408 | } |
409 | ||
3836309d | 410 | static int mxc_gpio_probe(struct platform_device *pdev) |
07bd1a6c | 411 | { |
8937cb60 | 412 | struct device_node *np = pdev->dev.of_node; |
b78d8e59 SG |
413 | struct mxc_gpio_port *port; |
414 | struct resource *iores; | |
1ab7ef15 | 415 | int irq_base; |
e4ea9333 | 416 | int err; |
b78d8e59 | 417 | |
e7fc6ae7 SG |
418 | mxc_gpio_get_hw(pdev); |
419 | ||
8cd73e4e | 420 | port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL); |
b78d8e59 SG |
421 | if (!port) |
422 | return -ENOMEM; | |
07bd1a6c | 423 | |
db5270ac BG |
424 | port->dev = &pdev->dev; |
425 | ||
b78d8e59 | 426 | iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
8cd73e4e FE |
427 | port->base = devm_ioremap_resource(&pdev->dev, iores); |
428 | if (IS_ERR(port->base)) | |
429 | return PTR_ERR(port->base); | |
b78d8e59 SG |
430 | |
431 | port->irq_high = platform_get_irq(pdev, 1); | |
cc9269f8 PR |
432 | if (port->irq_high < 0) |
433 | port->irq_high = 0; | |
434 | ||
b78d8e59 | 435 | port->irq = platform_get_irq(pdev, 0); |
8cd73e4e | 436 | if (port->irq < 0) |
5ea80e49 | 437 | return port->irq; |
b78d8e59 | 438 | |
2808801a AH |
439 | /* the controller clock is optional */ |
440 | port->clk = devm_clk_get(&pdev->dev, NULL); | |
441 | if (IS_ERR(port->clk)) | |
442 | port->clk = NULL; | |
443 | ||
444 | err = clk_prepare_enable(port->clk); | |
445 | if (err) { | |
446 | dev_err(&pdev->dev, "Unable to enable clock.\n"); | |
447 | return err; | |
448 | } | |
449 | ||
b78d8e59 SG |
450 | /* disable the interrupt and clear the status */ |
451 | writel(0, port->base + GPIO_IMR); | |
452 | writel(~0, port->base + GPIO_ISR); | |
453 | ||
e7fc6ae7 | 454 | if (mxc_gpio_hwtype == IMX21_GPIO) { |
33a4e985 UKK |
455 | /* |
456 | * Setup one handler for all GPIO interrupts. Actually setting | |
457 | * the handler is needed only once, but doing it for every port | |
458 | * is more robust and easier. | |
459 | */ | |
460 | irq_set_chained_handler(port->irq, mx2_gpio_irq_handler); | |
b78d8e59 SG |
461 | } else { |
462 | /* setup one handler for each entry */ | |
e65eea54 RK |
463 | irq_set_chained_handler_and_data(port->irq, |
464 | mx3_gpio_irq_handler, port); | |
465 | if (port->irq_high > 0) | |
b78d8e59 | 466 | /* setup handler for GPIO 16 to 31 */ |
e65eea54 RK |
467 | irq_set_chained_handler_and_data(port->irq_high, |
468 | mx3_gpio_irq_handler, | |
469 | port); | |
07bd1a6c JB |
470 | } |
471 | ||
0f4630f3 | 472 | err = bgpio_init(&port->gc, &pdev->dev, 4, |
2ce420da SG |
473 | port->base + GPIO_PSR, |
474 | port->base + GPIO_DR, NULL, | |
442b2494 VZ |
475 | port->base + GPIO_GDIR, NULL, |
476 | BGPIOF_READ_OUTPUT_REG_SET); | |
2ce420da | 477 | if (err) |
8cd73e4e | 478 | goto out_bgio; |
b78d8e59 | 479 | |
4c806c98 VZ |
480 | if (of_property_read_bool(np, "gpio-ranges")) { |
481 | port->gc.request = gpiochip_generic_request; | |
482 | port->gc.free = gpiochip_generic_free; | |
483 | } | |
484 | ||
0f4630f3 LW |
485 | port->gc.to_irq = mxc_gpio_to_irq; |
486 | port->gc.base = (pdev->id < 0) ? of_alias_get_id(np, "gpio") * 32 : | |
7e6086d9 | 487 | pdev->id * 32; |
b78d8e59 | 488 | |
ffc56630 | 489 | err = devm_gpiochip_add_data(&pdev->dev, &port->gc, port); |
b78d8e59 | 490 | if (err) |
0f4630f3 | 491 | goto out_bgio; |
b78d8e59 | 492 | |
c553c3c4 | 493 | irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, 32, numa_node_id()); |
1ab7ef15 SG |
494 | if (irq_base < 0) { |
495 | err = irq_base; | |
ffc56630 | 496 | goto out_bgio; |
1ab7ef15 SG |
497 | } |
498 | ||
499 | port->domain = irq_domain_add_legacy(np, 32, irq_base, 0, | |
500 | &irq_domain_simple_ops, NULL); | |
501 | if (!port->domain) { | |
502 | err = -ENODEV; | |
c553c3c4 | 503 | goto out_bgio; |
1ab7ef15 | 504 | } |
8937cb60 SG |
505 | |
506 | /* gpio-mxc can be a generic irq chip */ | |
9e26b0b1 PF |
507 | err = mxc_gpio_init_gc(port, irq_base); |
508 | if (err < 0) | |
509 | goto out_irqdomain_remove; | |
8937cb60 | 510 | |
b78d8e59 SG |
511 | list_add_tail(&port->node, &mxc_gpio_ports); |
512 | ||
07bd1a6c | 513 | return 0; |
b78d8e59 | 514 | |
9e26b0b1 PF |
515 | out_irqdomain_remove: |
516 | irq_domain_remove(port->domain); | |
8cd73e4e | 517 | out_bgio: |
2808801a | 518 | clk_disable_unprepare(port->clk); |
b78d8e59 SG |
519 | dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err); |
520 | return err; | |
07bd1a6c | 521 | } |
b78d8e59 SG |
522 | |
523 | static struct platform_driver mxc_gpio_driver = { | |
524 | .driver = { | |
525 | .name = "gpio-mxc", | |
8937cb60 | 526 | .of_match_table = mxc_gpio_dt_ids, |
90e1fc4c | 527 | .suppress_bind_attrs = true, |
b78d8e59 SG |
528 | }, |
529 | .probe = mxc_gpio_probe, | |
e7fc6ae7 | 530 | .id_table = mxc_gpio_devtype, |
b78d8e59 SG |
531 | }; |
532 | ||
533 | static int __init gpio_mxc_init(void) | |
534 | { | |
535 | return platform_driver_register(&mxc_gpio_driver); | |
536 | } | |
e188cbf7 | 537 | subsys_initcall(gpio_mxc_init); |