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a07e103e MD |
1 | /* |
2 | * Emma Mobile GPIO Support - GIO | |
3 | * | |
4 | * Copyright (C) 2012 Magnus Damm | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/ioport.h> | |
25 | #include <linux/io.h> | |
26 | #include <linux/irq.h> | |
27 | #include <linux/irqdomain.h> | |
28 | #include <linux/bitops.h> | |
29 | #include <linux/err.h> | |
30 | #include <linux/gpio.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/platform_data/gpio-em.h> | |
34 | ||
35 | struct em_gio_priv { | |
36 | void __iomem *base0; | |
37 | void __iomem *base1; | |
38 | unsigned int irq_base; | |
39 | spinlock_t sense_lock; | |
40 | struct platform_device *pdev; | |
41 | struct gpio_chip gpio_chip; | |
42 | struct irq_chip irq_chip; | |
43 | struct irq_domain *irq_domain; | |
44 | }; | |
45 | ||
46 | #define GIO_E1 0x00 | |
47 | #define GIO_E0 0x04 | |
48 | #define GIO_EM 0x04 | |
49 | #define GIO_OL 0x08 | |
50 | #define GIO_OH 0x0c | |
51 | #define GIO_I 0x10 | |
52 | #define GIO_IIA 0x14 | |
53 | #define GIO_IEN 0x18 | |
54 | #define GIO_IDS 0x1c | |
55 | #define GIO_IIM 0x1c | |
56 | #define GIO_RAW 0x20 | |
57 | #define GIO_MST 0x24 | |
58 | #define GIO_IIR 0x28 | |
59 | ||
60 | #define GIO_IDT0 0x40 | |
61 | #define GIO_IDT1 0x44 | |
62 | #define GIO_IDT2 0x48 | |
63 | #define GIO_IDT3 0x4c | |
64 | #define GIO_RAWBL 0x50 | |
65 | #define GIO_RAWBH 0x54 | |
66 | #define GIO_IRBL 0x58 | |
67 | #define GIO_IRBH 0x5c | |
68 | ||
69 | #define GIO_IDT(n) (GIO_IDT0 + ((n) * 4)) | |
70 | ||
71 | static inline unsigned long em_gio_read(struct em_gio_priv *p, int offs) | |
72 | { | |
73 | if (offs < GIO_IDT0) | |
74 | return ioread32(p->base0 + offs); | |
75 | else | |
76 | return ioread32(p->base1 + (offs - GIO_IDT0)); | |
77 | } | |
78 | ||
79 | static inline void em_gio_write(struct em_gio_priv *p, int offs, | |
80 | unsigned long value) | |
81 | { | |
82 | if (offs < GIO_IDT0) | |
83 | iowrite32(value, p->base0 + offs); | |
84 | else | |
85 | iowrite32(value, p->base1 + (offs - GIO_IDT0)); | |
86 | } | |
87 | ||
a07e103e MD |
88 | static void em_gio_irq_disable(struct irq_data *d) |
89 | { | |
a9f77c93 | 90 | struct em_gio_priv *p = irq_data_get_irq_chip_data(d); |
a07e103e MD |
91 | |
92 | em_gio_write(p, GIO_IDS, BIT(irqd_to_hwirq(d))); | |
93 | } | |
94 | ||
95 | static void em_gio_irq_enable(struct irq_data *d) | |
96 | { | |
a9f77c93 | 97 | struct em_gio_priv *p = irq_data_get_irq_chip_data(d); |
a07e103e MD |
98 | |
99 | em_gio_write(p, GIO_IEN, BIT(irqd_to_hwirq(d))); | |
100 | } | |
101 | ||
102 | #define GIO_ASYNC(x) (x + 8) | |
103 | ||
104 | static unsigned char em_gio_sense_table[IRQ_TYPE_SENSE_MASK + 1] = { | |
105 | [IRQ_TYPE_EDGE_RISING] = GIO_ASYNC(0x00), | |
106 | [IRQ_TYPE_EDGE_FALLING] = GIO_ASYNC(0x01), | |
107 | [IRQ_TYPE_LEVEL_HIGH] = GIO_ASYNC(0x02), | |
108 | [IRQ_TYPE_LEVEL_LOW] = GIO_ASYNC(0x03), | |
109 | [IRQ_TYPE_EDGE_BOTH] = GIO_ASYNC(0x04), | |
110 | }; | |
111 | ||
112 | static int em_gio_irq_set_type(struct irq_data *d, unsigned int type) | |
113 | { | |
114 | unsigned char value = em_gio_sense_table[type & IRQ_TYPE_SENSE_MASK]; | |
a9f77c93 | 115 | struct em_gio_priv *p = irq_data_get_irq_chip_data(d); |
a07e103e MD |
116 | unsigned int reg, offset, shift; |
117 | unsigned long flags; | |
118 | unsigned long tmp; | |
119 | ||
120 | if (!value) | |
121 | return -EINVAL; | |
122 | ||
123 | offset = irqd_to_hwirq(d); | |
124 | ||
125 | pr_debug("gio: sense irq = %d, mode = %d\n", offset, value); | |
126 | ||
127 | /* 8 x 4 bit fields in 4 IDT registers */ | |
128 | reg = GIO_IDT(offset >> 3); | |
129 | shift = (offset & 0x07) << 4; | |
130 | ||
131 | spin_lock_irqsave(&p->sense_lock, flags); | |
132 | ||
133 | /* disable the interrupt in IIA */ | |
134 | tmp = em_gio_read(p, GIO_IIA); | |
135 | tmp &= ~BIT(offset); | |
136 | em_gio_write(p, GIO_IIA, tmp); | |
137 | ||
138 | /* change the sense setting in IDT */ | |
139 | tmp = em_gio_read(p, reg); | |
140 | tmp &= ~(0xf << shift); | |
141 | tmp |= value << shift; | |
142 | em_gio_write(p, reg, tmp); | |
143 | ||
144 | /* clear pending interrupts */ | |
145 | em_gio_write(p, GIO_IIR, BIT(offset)); | |
146 | ||
147 | /* enable the interrupt in IIA */ | |
148 | tmp = em_gio_read(p, GIO_IIA); | |
149 | tmp |= BIT(offset); | |
150 | em_gio_write(p, GIO_IIA, tmp); | |
151 | ||
152 | spin_unlock_irqrestore(&p->sense_lock, flags); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static irqreturn_t em_gio_irq_handler(int irq, void *dev_id) | |
158 | { | |
159 | struct em_gio_priv *p = dev_id; | |
160 | unsigned long pending; | |
161 | unsigned int offset, irqs_handled = 0; | |
162 | ||
163 | while ((pending = em_gio_read(p, GIO_MST))) { | |
164 | offset = __ffs(pending); | |
165 | em_gio_write(p, GIO_IIR, BIT(offset)); | |
166 | generic_handle_irq(irq_find_mapping(p->irq_domain, offset)); | |
167 | irqs_handled++; | |
168 | } | |
169 | ||
170 | return irqs_handled ? IRQ_HANDLED : IRQ_NONE; | |
171 | } | |
172 | ||
173 | static inline struct em_gio_priv *gpio_to_priv(struct gpio_chip *chip) | |
174 | { | |
175 | return container_of(chip, struct em_gio_priv, gpio_chip); | |
176 | } | |
177 | ||
178 | static int em_gio_direction_input(struct gpio_chip *chip, unsigned offset) | |
179 | { | |
180 | em_gio_write(gpio_to_priv(chip), GIO_E0, BIT(offset)); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static int em_gio_get(struct gpio_chip *chip, unsigned offset) | |
185 | { | |
186 | return (int)(em_gio_read(gpio_to_priv(chip), GIO_I) & BIT(offset)); | |
187 | } | |
188 | ||
189 | static void __em_gio_set(struct gpio_chip *chip, unsigned int reg, | |
190 | unsigned shift, int value) | |
191 | { | |
192 | /* upper 16 bits contains mask and lower 16 actual value */ | |
193 | em_gio_write(gpio_to_priv(chip), reg, | |
194 | (1 << (shift + 16)) | (value << shift)); | |
195 | } | |
196 | ||
197 | static void em_gio_set(struct gpio_chip *chip, unsigned offset, int value) | |
198 | { | |
199 | /* output is split into two registers */ | |
200 | if (offset < 16) | |
201 | __em_gio_set(chip, GIO_OL, offset, value); | |
202 | else | |
203 | __em_gio_set(chip, GIO_OH, offset - 16, value); | |
204 | } | |
205 | ||
206 | static int em_gio_direction_output(struct gpio_chip *chip, unsigned offset, | |
207 | int value) | |
208 | { | |
209 | /* write GPIO value to output before selecting output mode of pin */ | |
210 | em_gio_set(chip, offset, value); | |
211 | em_gio_write(gpio_to_priv(chip), GIO_E1, BIT(offset)); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | static int em_gio_to_irq(struct gpio_chip *chip, unsigned offset) | |
216 | { | |
217 | return irq_find_mapping(gpio_to_priv(chip)->irq_domain, offset); | |
218 | } | |
219 | ||
220 | static int em_gio_irq_domain_map(struct irq_domain *h, unsigned int virq, | |
221 | irq_hw_number_t hw) | |
222 | { | |
223 | struct em_gio_priv *p = h->host_data; | |
224 | ||
225 | pr_debug("gio: map hw irq = %d, virq = %d\n", (int)hw, virq); | |
226 | ||
227 | irq_set_chip_data(virq, h->host_data); | |
228 | irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq); | |
229 | set_irq_flags(virq, IRQF_VALID); /* kill me now */ | |
230 | return 0; | |
231 | } | |
232 | ||
233 | static struct irq_domain_ops em_gio_irq_domain_ops = { | |
234 | .map = em_gio_irq_domain_map, | |
235 | }; | |
236 | ||
237 | static int __devinit em_gio_irq_domain_init(struct em_gio_priv *p) | |
238 | { | |
239 | struct platform_device *pdev = p->pdev; | |
240 | struct gpio_em_config *pdata = pdev->dev.platform_data; | |
241 | ||
242 | p->irq_base = irq_alloc_descs(pdata->irq_base, 0, | |
243 | pdata->number_of_pins, numa_node_id()); | |
dd291497 | 244 | if (p->irq_base < 0) { |
a07e103e | 245 | dev_err(&pdev->dev, "cannot get irq_desc\n"); |
dd291497 | 246 | return p->irq_base; |
a07e103e MD |
247 | } |
248 | pr_debug("gio: hw base = %d, nr = %d, sw base = %d\n", | |
249 | pdata->gpio_base, pdata->number_of_pins, p->irq_base); | |
250 | ||
251 | p->irq_domain = irq_domain_add_legacy(pdev->dev.of_node, | |
252 | pdata->number_of_pins, | |
253 | p->irq_base, 0, | |
254 | &em_gio_irq_domain_ops, p); | |
255 | if (!p->irq_domain) { | |
256 | irq_free_descs(p->irq_base, pdata->number_of_pins); | |
257 | return -ENXIO; | |
258 | } | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
38eaed32 | 263 | static void em_gio_irq_domain_cleanup(struct em_gio_priv *p) |
a07e103e MD |
264 | { |
265 | struct gpio_em_config *pdata = p->pdev->dev.platform_data; | |
266 | ||
267 | irq_free_descs(p->irq_base, pdata->number_of_pins); | |
268 | /* FIXME: irq domain wants to be freed! */ | |
269 | } | |
270 | ||
271 | static int __devinit em_gio_probe(struct platform_device *pdev) | |
272 | { | |
273 | struct gpio_em_config *pdata = pdev->dev.platform_data; | |
274 | struct em_gio_priv *p; | |
275 | struct resource *io[2], *irq[2]; | |
276 | struct gpio_chip *gpio_chip; | |
277 | struct irq_chip *irq_chip; | |
278 | const char *name = dev_name(&pdev->dev); | |
279 | int ret; | |
280 | ||
281 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
282 | if (!p) { | |
283 | dev_err(&pdev->dev, "failed to allocate driver data\n"); | |
284 | ret = -ENOMEM; | |
285 | goto err0; | |
286 | } | |
287 | ||
288 | p->pdev = pdev; | |
289 | platform_set_drvdata(pdev, p); | |
290 | spin_lock_init(&p->sense_lock); | |
291 | ||
292 | io[0] = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
293 | io[1] = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
294 | irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
295 | irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1); | |
296 | ||
297 | if (!io[0] || !io[1] || !irq[0] || !irq[1] || !pdata) { | |
298 | dev_err(&pdev->dev, "missing IRQ, IOMEM or configuration\n"); | |
299 | ret = -EINVAL; | |
300 | goto err1; | |
301 | } | |
302 | ||
303 | p->base0 = ioremap_nocache(io[0]->start, resource_size(io[0])); | |
304 | if (!p->base0) { | |
305 | dev_err(&pdev->dev, "failed to remap low I/O memory\n"); | |
306 | ret = -ENXIO; | |
307 | goto err1; | |
308 | } | |
309 | ||
310 | p->base1 = ioremap_nocache(io[1]->start, resource_size(io[1])); | |
311 | if (!p->base1) { | |
312 | dev_err(&pdev->dev, "failed to remap high I/O memory\n"); | |
313 | ret = -ENXIO; | |
314 | goto err2; | |
315 | } | |
316 | ||
317 | gpio_chip = &p->gpio_chip; | |
318 | gpio_chip->direction_input = em_gio_direction_input; | |
319 | gpio_chip->get = em_gio_get; | |
320 | gpio_chip->direction_output = em_gio_direction_output; | |
321 | gpio_chip->set = em_gio_set; | |
322 | gpio_chip->to_irq = em_gio_to_irq; | |
323 | gpio_chip->label = name; | |
324 | gpio_chip->owner = THIS_MODULE; | |
325 | gpio_chip->base = pdata->gpio_base; | |
326 | gpio_chip->ngpio = pdata->number_of_pins; | |
327 | ||
328 | irq_chip = &p->irq_chip; | |
329 | irq_chip->name = name; | |
330 | irq_chip->irq_mask = em_gio_irq_disable; | |
331 | irq_chip->irq_unmask = em_gio_irq_enable; | |
332 | irq_chip->irq_enable = em_gio_irq_enable; | |
333 | irq_chip->irq_disable = em_gio_irq_disable; | |
334 | irq_chip->irq_set_type = em_gio_irq_set_type; | |
335 | irq_chip->flags = IRQCHIP_SKIP_SET_WAKE; | |
336 | ||
337 | ret = em_gio_irq_domain_init(p); | |
338 | if (ret) { | |
339 | dev_err(&pdev->dev, "cannot initialize irq domain\n"); | |
340 | goto err3; | |
341 | } | |
342 | ||
343 | if (request_irq(irq[0]->start, em_gio_irq_handler, 0, name, p)) { | |
344 | dev_err(&pdev->dev, "failed to request low IRQ\n"); | |
345 | ret = -ENOENT; | |
346 | goto err4; | |
347 | } | |
348 | ||
349 | if (request_irq(irq[1]->start, em_gio_irq_handler, 0, name, p)) { | |
350 | dev_err(&pdev->dev, "failed to request high IRQ\n"); | |
351 | ret = -ENOENT; | |
352 | goto err5; | |
353 | } | |
354 | ||
355 | ret = gpiochip_add(gpio_chip); | |
356 | if (ret) { | |
357 | dev_err(&pdev->dev, "failed to add GPIO controller\n"); | |
358 | goto err6; | |
359 | } | |
360 | return 0; | |
361 | ||
362 | err6: | |
363 | free_irq(irq[1]->start, pdev); | |
364 | err5: | |
365 | free_irq(irq[0]->start, pdev); | |
366 | err4: | |
367 | em_gio_irq_domain_cleanup(p); | |
368 | err3: | |
369 | iounmap(p->base1); | |
370 | err2: | |
371 | iounmap(p->base0); | |
372 | err1: | |
373 | kfree(p); | |
374 | err0: | |
375 | return ret; | |
376 | } | |
377 | ||
378 | static int __devexit em_gio_remove(struct platform_device *pdev) | |
379 | { | |
380 | struct em_gio_priv *p = platform_get_drvdata(pdev); | |
381 | struct resource *irq[2]; | |
382 | int ret; | |
383 | ||
384 | ret = gpiochip_remove(&p->gpio_chip); | |
385 | if (ret) | |
386 | return ret; | |
387 | ||
388 | irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
389 | irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1); | |
390 | ||
391 | free_irq(irq[1]->start, pdev); | |
392 | free_irq(irq[0]->start, pdev); | |
393 | em_gio_irq_domain_cleanup(p); | |
394 | iounmap(p->base1); | |
395 | iounmap(p->base0); | |
396 | kfree(p); | |
397 | return 0; | |
398 | } | |
399 | ||
400 | static struct platform_driver em_gio_device_driver = { | |
401 | .probe = em_gio_probe, | |
402 | .remove = __devexit_p(em_gio_remove), | |
403 | .driver = { | |
404 | .name = "em_gio", | |
405 | } | |
406 | }; | |
407 | ||
408 | module_platform_driver(em_gio_device_driver); | |
409 | ||
410 | MODULE_AUTHOR("Magnus Damm"); | |
411 | MODULE_DESCRIPTION("Renesas Emma Mobile GIO Driver"); | |
412 | MODULE_LICENSE("GPL v2"); |