Commit | Line | Data |
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3d9edf09 VB |
1 | /* |
2 | * TI DaVinci GPIO Support | |
3 | * | |
dce1115b | 4 | * Copyright (c) 2006-2007 David Brownell |
3d9edf09 VB |
5 | * Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com> |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | */ | |
2f8163ba | 12 | #include <linux/gpio.h> |
3d9edf09 VB |
13 | #include <linux/errno.h> |
14 | #include <linux/kernel.h> | |
3d9edf09 VB |
15 | #include <linux/clk.h> |
16 | #include <linux/err.h> | |
17 | #include <linux/io.h> | |
118150f2 | 18 | #include <linux/irq.h> |
9211ff31 | 19 | #include <linux/irqdomain.h> |
c770844c KS |
20 | #include <linux/module.h> |
21 | #include <linux/of.h> | |
22 | #include <linux/of_device.h> | |
118150f2 KS |
23 | #include <linux/platform_device.h> |
24 | #include <linux/platform_data/gpio-davinci.h> | |
0d978eb7 | 25 | #include <linux/irqchip/chained_irq.h> |
3d9edf09 | 26 | |
c12f415a CC |
27 | struct davinci_gpio_regs { |
28 | u32 dir; | |
29 | u32 out_data; | |
30 | u32 set_data; | |
31 | u32 clr_data; | |
32 | u32 in_data; | |
33 | u32 set_rising; | |
34 | u32 clr_rising; | |
35 | u32 set_falling; | |
36 | u32 clr_falling; | |
37 | u32 intstat; | |
38 | }; | |
39 | ||
0c6feb07 GS |
40 | typedef struct irq_chip *(*gpio_get_irq_chip_cb_t)(unsigned int irq); |
41 | ||
131a10a3 PA |
42 | #define BINTEN 0x8 /* GPIO Interrupt Per-Bank Enable Register */ |
43 | ||
ba4a984e | 44 | #define chip2controller(chip) \ |
99e9e52d | 45 | container_of(chip, struct davinci_gpio_controller, chip) |
ba4a984e | 46 | |
b8d44293 | 47 | static void __iomem *gpio_base; |
3d9edf09 | 48 | |
118150f2 | 49 | static struct davinci_gpio_regs __iomem *gpio2regs(unsigned gpio) |
3d9edf09 | 50 | { |
c12f415a | 51 | void __iomem *ptr; |
c12f415a CC |
52 | |
53 | if (gpio < 32 * 1) | |
b8d44293 | 54 | ptr = gpio_base + 0x10; |
c12f415a | 55 | else if (gpio < 32 * 2) |
b8d44293 | 56 | ptr = gpio_base + 0x38; |
c12f415a | 57 | else if (gpio < 32 * 3) |
b8d44293 | 58 | ptr = gpio_base + 0x60; |
c12f415a | 59 | else if (gpio < 32 * 4) |
b8d44293 | 60 | ptr = gpio_base + 0x88; |
c12f415a | 61 | else if (gpio < 32 * 5) |
b8d44293 | 62 | ptr = gpio_base + 0xb0; |
c12f415a CC |
63 | else |
64 | ptr = NULL; | |
65 | return ptr; | |
3d9edf09 VB |
66 | } |
67 | ||
99e9e52d | 68 | static inline struct davinci_gpio_regs __iomem *irq2regs(int irq) |
21ce873d | 69 | { |
99e9e52d | 70 | struct davinci_gpio_regs __iomem *g; |
21ce873d | 71 | |
6845664a | 72 | g = (__force struct davinci_gpio_regs __iomem *)irq_get_chip_data(irq); |
21ce873d KH |
73 | |
74 | return g; | |
75 | } | |
76 | ||
118150f2 | 77 | static int davinci_gpio_irq_setup(struct platform_device *pdev); |
dce1115b DB |
78 | |
79 | /*--------------------------------------------------------------------------*/ | |
80 | ||
5b3a05ca | 81 | /* board setup code *MUST* setup pinmux and enable the GPIO clock. */ |
ba4a984e CC |
82 | static inline int __davinci_direction(struct gpio_chip *chip, |
83 | unsigned offset, bool out, int value) | |
3d9edf09 | 84 | { |
99e9e52d CC |
85 | struct davinci_gpio_controller *d = chip2controller(chip); |
86 | struct davinci_gpio_regs __iomem *g = d->regs; | |
b27b6d03 | 87 | unsigned long flags; |
dce1115b | 88 | u32 temp; |
ba4a984e | 89 | u32 mask = 1 << offset; |
3d9edf09 | 90 | |
b27b6d03 | 91 | spin_lock_irqsave(&d->lock, flags); |
388291c3 | 92 | temp = readl_relaxed(&g->dir); |
ba4a984e CC |
93 | if (out) { |
94 | temp &= ~mask; | |
388291c3 | 95 | writel_relaxed(mask, value ? &g->set_data : &g->clr_data); |
ba4a984e CC |
96 | } else { |
97 | temp |= mask; | |
98 | } | |
388291c3 | 99 | writel_relaxed(temp, &g->dir); |
b27b6d03 | 100 | spin_unlock_irqrestore(&d->lock, flags); |
3d9edf09 | 101 | |
dce1115b DB |
102 | return 0; |
103 | } | |
3d9edf09 | 104 | |
ba4a984e CC |
105 | static int davinci_direction_in(struct gpio_chip *chip, unsigned offset) |
106 | { | |
107 | return __davinci_direction(chip, offset, false, 0); | |
108 | } | |
109 | ||
110 | static int | |
111 | davinci_direction_out(struct gpio_chip *chip, unsigned offset, int value) | |
112 | { | |
113 | return __davinci_direction(chip, offset, true, value); | |
114 | } | |
115 | ||
3d9edf09 VB |
116 | /* |
117 | * Read the pin's value (works even if it's set up as output); | |
118 | * returns zero/nonzero. | |
119 | * | |
120 | * Note that changes are synched to the GPIO clock, so reading values back | |
121 | * right after you've set them may give old values. | |
122 | */ | |
dce1115b | 123 | static int davinci_gpio_get(struct gpio_chip *chip, unsigned offset) |
3d9edf09 | 124 | { |
99e9e52d CC |
125 | struct davinci_gpio_controller *d = chip2controller(chip); |
126 | struct davinci_gpio_regs __iomem *g = d->regs; | |
3d9edf09 | 127 | |
388291c3 | 128 | return (1 << offset) & readl_relaxed(&g->in_data); |
3d9edf09 | 129 | } |
3d9edf09 | 130 | |
dce1115b DB |
131 | /* |
132 | * Assuming the pin is muxed as a gpio output, set its output value. | |
133 | */ | |
134 | static void | |
135 | davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
3d9edf09 | 136 | { |
99e9e52d CC |
137 | struct davinci_gpio_controller *d = chip2controller(chip); |
138 | struct davinci_gpio_regs __iomem *g = d->regs; | |
3d9edf09 | 139 | |
388291c3 | 140 | writel_relaxed((1 << offset), value ? &g->set_data : &g->clr_data); |
dce1115b DB |
141 | } |
142 | ||
c770844c KS |
143 | static struct davinci_gpio_platform_data * |
144 | davinci_gpio_get_pdata(struct platform_device *pdev) | |
145 | { | |
146 | struct device_node *dn = pdev->dev.of_node; | |
147 | struct davinci_gpio_platform_data *pdata; | |
148 | int ret; | |
149 | u32 val; | |
150 | ||
151 | if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node) | |
152 | return pdev->dev.platform_data; | |
153 | ||
154 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
155 | if (!pdata) | |
156 | return NULL; | |
157 | ||
158 | ret = of_property_read_u32(dn, "ti,ngpio", &val); | |
159 | if (ret) | |
160 | goto of_err; | |
161 | ||
162 | pdata->ngpio = val; | |
163 | ||
164 | ret = of_property_read_u32(dn, "ti,davinci-gpio-unbanked", &val); | |
165 | if (ret) | |
166 | goto of_err; | |
167 | ||
168 | pdata->gpio_unbanked = val; | |
169 | ||
170 | return pdata; | |
171 | ||
172 | of_err: | |
173 | dev_err(&pdev->dev, "Populating pdata from DT failed: err %d\n", ret); | |
174 | return NULL; | |
175 | } | |
176 | ||
758afe42 AH |
177 | #ifdef CONFIG_OF_GPIO |
178 | static int davinci_gpio_of_xlate(struct gpio_chip *gc, | |
179 | const struct of_phandle_args *gpiospec, | |
180 | u32 *flags) | |
181 | { | |
182 | struct davinci_gpio_controller *chips = dev_get_drvdata(gc->dev); | |
183 | struct davinci_gpio_platform_data *pdata = dev_get_platdata(gc->dev); | |
184 | ||
185 | if (gpiospec->args[0] > pdata->ngpio) | |
186 | return -EINVAL; | |
187 | ||
188 | if (gc != &chips[gpiospec->args[0] / 32].chip) | |
189 | return -EINVAL; | |
190 | ||
191 | if (flags) | |
192 | *flags = gpiospec->args[1]; | |
193 | ||
194 | return gpiospec->args[0] % 32; | |
195 | } | |
196 | #endif | |
197 | ||
118150f2 | 198 | static int davinci_gpio_probe(struct platform_device *pdev) |
dce1115b DB |
199 | { |
200 | int i, base; | |
a994955c | 201 | unsigned ngpio; |
118150f2 KS |
202 | struct davinci_gpio_controller *chips; |
203 | struct davinci_gpio_platform_data *pdata; | |
204 | struct davinci_gpio_regs __iomem *regs; | |
205 | struct device *dev = &pdev->dev; | |
206 | struct resource *res; | |
207 | ||
c770844c | 208 | pdata = davinci_gpio_get_pdata(pdev); |
118150f2 KS |
209 | if (!pdata) { |
210 | dev_err(dev, "No platform data found\n"); | |
211 | return -EINVAL; | |
212 | } | |
686b634a | 213 | |
c770844c KS |
214 | dev->platform_data = pdata; |
215 | ||
a994955c MG |
216 | /* |
217 | * The gpio banks conceptually expose a segmented bitmap, | |
474dad54 DB |
218 | * and "ngpio" is one more than the largest zero-based |
219 | * bit index that's valid. | |
220 | */ | |
118150f2 | 221 | ngpio = pdata->ngpio; |
a994955c | 222 | if (ngpio == 0) { |
118150f2 | 223 | dev_err(dev, "How many GPIOs?\n"); |
474dad54 DB |
224 | return -EINVAL; |
225 | } | |
226 | ||
c21d500b GS |
227 | if (WARN_ON(ARCH_NR_GPIOS < ngpio)) |
228 | ngpio = ARCH_NR_GPIOS; | |
474dad54 | 229 | |
118150f2 KS |
230 | chips = devm_kzalloc(dev, |
231 | ngpio * sizeof(struct davinci_gpio_controller), | |
232 | GFP_KERNEL); | |
233 | if (!chips) { | |
234 | dev_err(dev, "Memory allocation failed\n"); | |
b8d44293 | 235 | return -ENOMEM; |
118150f2 KS |
236 | } |
237 | ||
238 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
239 | if (!res) { | |
240 | dev_err(dev, "Invalid memory resource\n"); | |
241 | return -EBUSY; | |
242 | } | |
243 | ||
244 | gpio_base = devm_ioremap_resource(dev, res); | |
245 | if (IS_ERR(gpio_base)) | |
246 | return PTR_ERR(gpio_base); | |
b8d44293 | 247 | |
474dad54 | 248 | for (i = 0, base = 0; base < ngpio; i++, base += 32) { |
dce1115b DB |
249 | chips[i].chip.label = "DaVinci"; |
250 | ||
251 | chips[i].chip.direction_input = davinci_direction_in; | |
252 | chips[i].chip.get = davinci_gpio_get; | |
253 | chips[i].chip.direction_output = davinci_direction_out; | |
254 | chips[i].chip.set = davinci_gpio_set; | |
255 | ||
256 | chips[i].chip.base = base; | |
474dad54 | 257 | chips[i].chip.ngpio = ngpio - base; |
dce1115b DB |
258 | if (chips[i].chip.ngpio > 32) |
259 | chips[i].chip.ngpio = 32; | |
260 | ||
c770844c | 261 | #ifdef CONFIG_OF_GPIO |
758afe42 AH |
262 | chips[i].chip.of_gpio_n_cells = 2; |
263 | chips[i].chip.of_xlate = davinci_gpio_of_xlate; | |
264 | chips[i].chip.dev = dev; | |
c770844c KS |
265 | chips[i].chip.of_node = dev->of_node; |
266 | #endif | |
b27b6d03 CC |
267 | spin_lock_init(&chips[i].lock); |
268 | ||
c12f415a CC |
269 | regs = gpio2regs(base); |
270 | chips[i].regs = regs; | |
271 | chips[i].set_data = ®s->set_data; | |
272 | chips[i].clr_data = ®s->clr_data; | |
273 | chips[i].in_data = ®s->in_data; | |
dce1115b DB |
274 | |
275 | gpiochip_add(&chips[i].chip); | |
276 | } | |
3d9edf09 | 277 | |
118150f2 KS |
278 | platform_set_drvdata(pdev, chips); |
279 | davinci_gpio_irq_setup(pdev); | |
3d9edf09 VB |
280 | return 0; |
281 | } | |
3d9edf09 | 282 | |
dce1115b | 283 | /*--------------------------------------------------------------------------*/ |
3d9edf09 VB |
284 | /* |
285 | * We expect irqs will normally be set up as input pins, but they can also be | |
286 | * used as output pins ... which is convenient for testing. | |
287 | * | |
474dad54 | 288 | * NOTE: The first few GPIOs also have direct INTC hookups in addition |
7a36071e | 289 | * to their GPIOBNK0 irq, with a bit less overhead. |
3d9edf09 | 290 | * |
474dad54 | 291 | * All those INTC hookups (direct, plus several IRQ banks) can also |
3d9edf09 VB |
292 | * serve as EDMA event triggers. |
293 | */ | |
294 | ||
23265442 | 295 | static void gpio_irq_disable(struct irq_data *d) |
3d9edf09 | 296 | { |
23265442 | 297 | struct davinci_gpio_regs __iomem *g = irq2regs(d->irq); |
6845664a | 298 | u32 mask = (u32) irq_data_get_irq_handler_data(d); |
3d9edf09 | 299 | |
388291c3 LP |
300 | writel_relaxed(mask, &g->clr_falling); |
301 | writel_relaxed(mask, &g->clr_rising); | |
3d9edf09 VB |
302 | } |
303 | ||
23265442 | 304 | static void gpio_irq_enable(struct irq_data *d) |
3d9edf09 | 305 | { |
23265442 | 306 | struct davinci_gpio_regs __iomem *g = irq2regs(d->irq); |
6845664a | 307 | u32 mask = (u32) irq_data_get_irq_handler_data(d); |
5093aec8 | 308 | unsigned status = irqd_get_trigger_type(d); |
3d9edf09 | 309 | |
df4aab46 DB |
310 | status &= IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING; |
311 | if (!status) | |
312 | status = IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING; | |
313 | ||
314 | if (status & IRQ_TYPE_EDGE_FALLING) | |
388291c3 | 315 | writel_relaxed(mask, &g->set_falling); |
df4aab46 | 316 | if (status & IRQ_TYPE_EDGE_RISING) |
388291c3 | 317 | writel_relaxed(mask, &g->set_rising); |
3d9edf09 VB |
318 | } |
319 | ||
23265442 | 320 | static int gpio_irq_type(struct irq_data *d, unsigned trigger) |
3d9edf09 | 321 | { |
3d9edf09 VB |
322 | if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) |
323 | return -EINVAL; | |
324 | ||
3d9edf09 VB |
325 | return 0; |
326 | } | |
327 | ||
328 | static struct irq_chip gpio_irqchip = { | |
329 | .name = "GPIO", | |
23265442 LB |
330 | .irq_enable = gpio_irq_enable, |
331 | .irq_disable = gpio_irq_disable, | |
332 | .irq_set_type = gpio_irq_type, | |
5093aec8 | 333 | .flags = IRQCHIP_SET_TYPE_MASKED, |
3d9edf09 VB |
334 | }; |
335 | ||
336 | static void | |
337 | gpio_irq_handler(unsigned irq, struct irq_desc *desc) | |
338 | { | |
74164016 | 339 | struct davinci_gpio_regs __iomem *g; |
3d9edf09 | 340 | u32 mask = 0xffff; |
f299bb95 | 341 | struct davinci_gpio_controller *d; |
3d9edf09 | 342 | |
f299bb95 IY |
343 | d = (struct davinci_gpio_controller *)irq_desc_get_handler_data(desc); |
344 | g = (struct davinci_gpio_regs __iomem *)d->regs; | |
74164016 | 345 | |
3d9edf09 VB |
346 | /* we only care about one bank */ |
347 | if (irq & 1) | |
348 | mask <<= 16; | |
349 | ||
350 | /* temporarily mask (level sensitive) parent IRQ */ | |
0d978eb7 | 351 | chained_irq_enter(irq_desc_get_chip(desc), desc); |
3d9edf09 VB |
352 | while (1) { |
353 | u32 status; | |
9211ff31 | 354 | int bit; |
3d9edf09 VB |
355 | |
356 | /* ack any irqs */ | |
388291c3 | 357 | status = readl_relaxed(&g->intstat) & mask; |
3d9edf09 VB |
358 | if (!status) |
359 | break; | |
388291c3 | 360 | writel_relaxed(status, &g->intstat); |
3d9edf09 VB |
361 | |
362 | /* now demux them to the right lowlevel handler */ | |
f299bb95 | 363 | |
3d9edf09 | 364 | while (status) { |
9211ff31 LP |
365 | bit = __ffs(status); |
366 | status &= ~BIT(bit); | |
367 | generic_handle_irq( | |
368 | irq_find_mapping(d->irq_domain, | |
369 | d->chip.base + bit)); | |
3d9edf09 VB |
370 | } |
371 | } | |
0d978eb7 | 372 | chained_irq_exit(irq_desc_get_chip(desc), desc); |
3d9edf09 VB |
373 | /* now it may re-trigger */ |
374 | } | |
375 | ||
7a36071e DB |
376 | static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset) |
377 | { | |
99e9e52d | 378 | struct davinci_gpio_controller *d = chip2controller(chip); |
7a36071e | 379 | |
6075a8b2 GS |
380 | if (d->irq_domain) |
381 | return irq_create_mapping(d->irq_domain, d->chip.base + offset); | |
382 | else | |
383 | return -ENXIO; | |
7a36071e DB |
384 | } |
385 | ||
386 | static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset) | |
387 | { | |
118150f2 | 388 | struct davinci_gpio_controller *d = chip2controller(chip); |
7a36071e | 389 | |
131a10a3 PA |
390 | /* |
391 | * NOTE: we assume for now that only irqs in the first gpio_chip | |
7a36071e DB |
392 | * can provide direct-mapped IRQs to AINTC (up to 32 GPIOs). |
393 | */ | |
34af1ab4 | 394 | if (offset < d->gpio_unbanked) |
118150f2 | 395 | return d->gpio_irq + offset; |
7a36071e DB |
396 | else |
397 | return -ENODEV; | |
398 | } | |
399 | ||
ab2dde99 | 400 | static int gpio_irq_type_unbanked(struct irq_data *data, unsigned trigger) |
7a36071e | 401 | { |
ab2dde99 SN |
402 | struct davinci_gpio_controller *d; |
403 | struct davinci_gpio_regs __iomem *g; | |
ab2dde99 SN |
404 | u32 mask; |
405 | ||
406 | d = (struct davinci_gpio_controller *)data->handler_data; | |
407 | g = (struct davinci_gpio_regs __iomem *)d->regs; | |
118150f2 | 408 | mask = __gpio_mask(data->irq - d->gpio_irq); |
7a36071e DB |
409 | |
410 | if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) | |
411 | return -EINVAL; | |
412 | ||
388291c3 | 413 | writel_relaxed(mask, (trigger & IRQ_TYPE_EDGE_FALLING) |
7a36071e | 414 | ? &g->set_falling : &g->clr_falling); |
388291c3 | 415 | writel_relaxed(mask, (trigger & IRQ_TYPE_EDGE_RISING) |
7a36071e DB |
416 | ? &g->set_rising : &g->clr_rising); |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
9211ff31 LP |
421 | static int |
422 | davinci_gpio_irq_map(struct irq_domain *d, unsigned int irq, | |
423 | irq_hw_number_t hw) | |
424 | { | |
425 | struct davinci_gpio_regs __iomem *g = gpio2regs(hw); | |
426 | ||
427 | irq_set_chip_and_handler_name(irq, &gpio_irqchip, handle_simple_irq, | |
428 | "davinci_gpio"); | |
429 | irq_set_irq_type(irq, IRQ_TYPE_NONE); | |
430 | irq_set_chip_data(irq, (__force void *)g); | |
431 | irq_set_handler_data(irq, (void *)__gpio_mask(hw)); | |
432 | set_irq_flags(irq, IRQF_VALID); | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | static const struct irq_domain_ops davinci_gpio_irq_ops = { | |
438 | .map = davinci_gpio_irq_map, | |
439 | .xlate = irq_domain_xlate_onetwocell, | |
440 | }; | |
441 | ||
0c6feb07 GS |
442 | static struct irq_chip *davinci_gpio_get_irq_chip(unsigned int irq) |
443 | { | |
444 | static struct irq_chip_type gpio_unbanked; | |
445 | ||
446 | gpio_unbanked = *container_of(irq_get_chip(irq), | |
447 | struct irq_chip_type, chip); | |
448 | ||
449 | return &gpio_unbanked.chip; | |
450 | }; | |
451 | ||
452 | static struct irq_chip *keystone_gpio_get_irq_chip(unsigned int irq) | |
453 | { | |
454 | static struct irq_chip gpio_unbanked; | |
455 | ||
456 | gpio_unbanked = *irq_get_chip(irq); | |
457 | return &gpio_unbanked; | |
458 | }; | |
459 | ||
460 | static const struct of_device_id davinci_gpio_ids[]; | |
461 | ||
3d9edf09 | 462 | /* |
474dad54 DB |
463 | * NOTE: for suspend/resume, probably best to make a platform_device with |
464 | * suspend_late/resume_resume calls hooking into results of the set_wake() | |
3d9edf09 VB |
465 | * calls ... so if no gpios are wakeup events the clock can be disabled, |
466 | * with outputs left at previously set levels, and so that VDD3P3V.IOPWDN0 | |
474dad54 | 467 | * (dm6446) can be set appropriately for GPIOV33 pins. |
3d9edf09 VB |
468 | */ |
469 | ||
118150f2 | 470 | static int davinci_gpio_irq_setup(struct platform_device *pdev) |
3d9edf09 | 471 | { |
58c0f5aa AS |
472 | unsigned gpio, bank; |
473 | int irq; | |
3d9edf09 | 474 | struct clk *clk; |
474dad54 | 475 | u32 binten = 0; |
a994955c | 476 | unsigned ngpio, bank_irq; |
118150f2 KS |
477 | struct device *dev = &pdev->dev; |
478 | struct resource *res; | |
479 | struct davinci_gpio_controller *chips = platform_get_drvdata(pdev); | |
480 | struct davinci_gpio_platform_data *pdata = dev->platform_data; | |
481 | struct davinci_gpio_regs __iomem *g; | |
6075a8b2 | 482 | struct irq_domain *irq_domain = NULL; |
0c6feb07 GS |
483 | const struct of_device_id *match; |
484 | struct irq_chip *irq_chip; | |
485 | gpio_get_irq_chip_cb_t gpio_get_irq_chip; | |
486 | ||
487 | /* | |
488 | * Use davinci_gpio_get_irq_chip by default to handle non DT cases | |
489 | */ | |
490 | gpio_get_irq_chip = davinci_gpio_get_irq_chip; | |
491 | match = of_match_device(of_match_ptr(davinci_gpio_ids), | |
492 | dev); | |
493 | if (match) | |
494 | gpio_get_irq_chip = (gpio_get_irq_chip_cb_t)match->data; | |
a994955c | 495 | |
118150f2 KS |
496 | ngpio = pdata->ngpio; |
497 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
498 | if (!res) { | |
499 | dev_err(dev, "Invalid IRQ resource\n"); | |
500 | return -EBUSY; | |
501 | } | |
474dad54 | 502 | |
118150f2 KS |
503 | bank_irq = res->start; |
504 | ||
505 | if (!bank_irq) { | |
506 | dev_err(dev, "Invalid IRQ resource\n"); | |
507 | return -ENODEV; | |
474dad54 | 508 | } |
3d9edf09 | 509 | |
118150f2 | 510 | clk = devm_clk_get(dev, "gpio"); |
3d9edf09 VB |
511 | if (IS_ERR(clk)) { |
512 | printk(KERN_ERR "Error %ld getting gpio clock?\n", | |
513 | PTR_ERR(clk)); | |
474dad54 | 514 | return PTR_ERR(clk); |
3d9edf09 | 515 | } |
ce6b658d | 516 | clk_prepare_enable(clk); |
3d9edf09 | 517 | |
6075a8b2 GS |
518 | if (!pdata->gpio_unbanked) { |
519 | irq = irq_alloc_descs(-1, 0, ngpio, 0); | |
520 | if (irq < 0) { | |
521 | dev_err(dev, "Couldn't allocate IRQ numbers\n"); | |
522 | return irq; | |
523 | } | |
9211ff31 | 524 | |
6075a8b2 GS |
525 | irq_domain = irq_domain_add_legacy(NULL, ngpio, irq, 0, |
526 | &davinci_gpio_irq_ops, | |
527 | chips); | |
528 | if (!irq_domain) { | |
529 | dev_err(dev, "Couldn't register an IRQ domain\n"); | |
530 | return -ENODEV; | |
531 | } | |
9211ff31 LP |
532 | } |
533 | ||
131a10a3 PA |
534 | /* |
535 | * Arrange gpio_to_irq() support, handling either direct IRQs or | |
7a36071e DB |
536 | * banked IRQs. Having GPIOs in the first GPIO bank use direct |
537 | * IRQs, while the others use banked IRQs, would need some setup | |
538 | * tweaks to recognize hardware which can do that. | |
539 | */ | |
540 | for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 32) { | |
541 | chips[bank].chip.to_irq = gpio_to_irq_banked; | |
6075a8b2 | 542 | chips[bank].irq_domain = irq_domain; |
7a36071e DB |
543 | } |
544 | ||
545 | /* | |
546 | * AINTC can handle direct/unbanked IRQs for GPIOs, with the GPIO | |
547 | * controller only handling trigger modes. We currently assume no | |
548 | * IRQ mux conflicts; gpio_irq_type_unbanked() is only for GPIOs. | |
549 | */ | |
118150f2 | 550 | if (pdata->gpio_unbanked) { |
7a36071e DB |
551 | /* pass "bank 0" GPIO IRQs to AINTC */ |
552 | chips[0].chip.to_irq = gpio_to_irq_unbanked; | |
34af1ab4 LP |
553 | chips[0].gpio_irq = bank_irq; |
554 | chips[0].gpio_unbanked = pdata->gpio_unbanked; | |
7a36071e DB |
555 | binten = BIT(0); |
556 | ||
557 | /* AINTC handles mask/unmask; GPIO handles triggering */ | |
558 | irq = bank_irq; | |
0c6feb07 GS |
559 | irq_chip = gpio_get_irq_chip(irq); |
560 | irq_chip->name = "GPIO-AINTC"; | |
561 | irq_chip->irq_set_type = gpio_irq_type_unbanked; | |
7a36071e DB |
562 | |
563 | /* default trigger: both edges */ | |
99e9e52d | 564 | g = gpio2regs(0); |
388291c3 LP |
565 | writel_relaxed(~0, &g->set_falling); |
566 | writel_relaxed(~0, &g->set_rising); | |
7a36071e DB |
567 | |
568 | /* set the direct IRQs up to use that irqchip */ | |
118150f2 | 569 | for (gpio = 0; gpio < pdata->gpio_unbanked; gpio++, irq++) { |
0c6feb07 | 570 | irq_set_chip(irq, irq_chip); |
ab2dde99 | 571 | irq_set_handler_data(irq, &chips[gpio / 32]); |
5093aec8 | 572 | irq_set_status_flags(irq, IRQ_TYPE_EDGE_BOTH); |
7a36071e DB |
573 | } |
574 | ||
575 | goto done; | |
576 | } | |
577 | ||
578 | /* | |
579 | * Or, AINTC can handle IRQs for banks of 16 GPIO IRQs, which we | |
580 | * then chain through our own handler. | |
581 | */ | |
9211ff31 | 582 | for (gpio = 0, bank = 0; gpio < ngpio; bank++, bank_irq++, gpio += 16) { |
7a36071e | 583 | /* disabled by default, enabled only as needed */ |
99e9e52d | 584 | g = gpio2regs(gpio); |
388291c3 LP |
585 | writel_relaxed(~0, &g->clr_falling); |
586 | writel_relaxed(~0, &g->clr_rising); | |
3d9edf09 VB |
587 | |
588 | /* set up all irqs in this bank */ | |
6845664a | 589 | irq_set_chained_handler(bank_irq, gpio_irq_handler); |
f299bb95 IY |
590 | |
591 | /* | |
592 | * Each chip handles 32 gpios, and each irq bank consists of 16 | |
593 | * gpio irqs. Pass the irq bank's corresponding controller to | |
594 | * the chained irq handler. | |
595 | */ | |
596 | irq_set_handler_data(bank_irq, &chips[gpio / 32]); | |
3d9edf09 | 597 | |
474dad54 | 598 | binten |= BIT(bank); |
3d9edf09 VB |
599 | } |
600 | ||
7a36071e | 601 | done: |
131a10a3 PA |
602 | /* |
603 | * BINTEN -- per-bank interrupt enable. genirq would also let these | |
3d9edf09 VB |
604 | * bits be set/cleared dynamically. |
605 | */ | |
388291c3 | 606 | writel_relaxed(binten, gpio_base + BINTEN); |
3d9edf09 | 607 | |
3d9edf09 VB |
608 | return 0; |
609 | } | |
118150f2 | 610 | |
c770844c KS |
611 | #if IS_ENABLED(CONFIG_OF) |
612 | static const struct of_device_id davinci_gpio_ids[] = { | |
0c6feb07 GS |
613 | { .compatible = "ti,keystone-gpio", keystone_gpio_get_irq_chip}, |
614 | { .compatible = "ti,dm6441-gpio", davinci_gpio_get_irq_chip}, | |
c770844c KS |
615 | { /* sentinel */ }, |
616 | }; | |
617 | MODULE_DEVICE_TABLE(of, davinci_gpio_ids); | |
618 | #endif | |
619 | ||
118150f2 KS |
620 | static struct platform_driver davinci_gpio_driver = { |
621 | .probe = davinci_gpio_probe, | |
622 | .driver = { | |
c770844c KS |
623 | .name = "davinci_gpio", |
624 | .owner = THIS_MODULE, | |
625 | .of_match_table = of_match_ptr(davinci_gpio_ids), | |
118150f2 KS |
626 | }, |
627 | }; | |
628 | ||
629 | /** | |
630 | * GPIO driver registration needs to be done before machine_init functions | |
631 | * access GPIO. Hence davinci_gpio_drv_reg() is a postcore_initcall. | |
632 | */ | |
633 | static int __init davinci_gpio_drv_reg(void) | |
634 | { | |
635 | return platform_driver_register(&davinci_gpio_driver); | |
636 | } | |
637 | postcore_initcall(davinci_gpio_drv_reg); |