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Peter Korsgaard1e16dfc2008-09-23 17:35:38 +02001/*
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +02002 * GPIOs on MPC512x/8349/8572/8610 and compatible
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +02003 *
4 * Copyright (C) 2008 Peter Korsgaard <jacmet@sunsite.dk>
5 *
6 * This file is licensed under the terms of the GNU General Public License
7 * version 2. This program is licensed "as is" without any warranty of any
8 * kind, whether express or implied.
9 */
10
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/spinlock.h>
14#include <linux/io.h>
15#include <linux/of.h>
16#include <linux/of_gpio.h>
17#include <linux/gpio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Peter Korsgaard345e5c82010-01-07 17:57:46 +010019#include <linux/irq.h>
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +020020
21#define MPC8XXX_GPIO_PINS 32
22
23#define GPIO_DIR 0x00
24#define GPIO_ODR 0x04
25#define GPIO_DAT 0x08
26#define GPIO_IER 0x0c
27#define GPIO_IMR 0x10
28#define GPIO_ICR 0x14
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +020029#define GPIO_ICR2 0x18
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +020030
31struct mpc8xxx_gpio_chip {
32 struct of_mm_gpio_chip mm_gc;
33 spinlock_t lock;
34
35 /*
36 * shadowed data register to be able to clear/set output pins in
37 * open drain mode safely
38 */
39 u32 data;
Grant Likelybae1d8f2012-02-14 14:06:50 -070040 struct irq_domain *irq;
Uwe Kleine-König01a04dd2012-05-21 21:57:39 +020041 const void *of_dev_id_data;
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +020042};
43
44static inline u32 mpc8xxx_gpio2mask(unsigned int gpio)
45{
46 return 1u << (MPC8XXX_GPIO_PINS - 1 - gpio);
47}
48
49static inline struct mpc8xxx_gpio_chip *
50to_mpc8xxx_gpio_chip(struct of_mm_gpio_chip *mm)
51{
52 return container_of(mm, struct mpc8xxx_gpio_chip, mm_gc);
53}
54
55static void mpc8xxx_gpio_save_regs(struct of_mm_gpio_chip *mm)
56{
57 struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
58
59 mpc8xxx_gc->data = in_be32(mm->regs + GPIO_DAT);
60}
61
Felix Radenskyc1a676d2009-08-12 08:57:39 +030062/* Workaround GPIO 1 errata on MPC8572/MPC8536. The status of GPIOs
63 * defined as output cannot be determined by reading GPDAT register,
64 * so we use shadow data register instead. The status of input pins
65 * is determined by reading GPDAT register.
66 */
67static int mpc8572_gpio_get(struct gpio_chip *gc, unsigned int gpio)
68{
69 u32 val;
70 struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
71 struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
72
73 val = in_be32(mm->regs + GPIO_DAT) & ~in_be32(mm->regs + GPIO_DIR);
74
75 return (val | mpc8xxx_gc->data) & mpc8xxx_gpio2mask(gpio);
76}
77
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +020078static int mpc8xxx_gpio_get(struct gpio_chip *gc, unsigned int gpio)
79{
80 struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
81
82 return in_be32(mm->regs + GPIO_DAT) & mpc8xxx_gpio2mask(gpio);
83}
84
85static void mpc8xxx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
86{
87 struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
88 struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
89 unsigned long flags;
90
91 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
92
93 if (val)
94 mpc8xxx_gc->data |= mpc8xxx_gpio2mask(gpio);
95 else
96 mpc8xxx_gc->data &= ~mpc8xxx_gpio2mask(gpio);
97
98 out_be32(mm->regs + GPIO_DAT, mpc8xxx_gc->data);
99
100 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
101}
102
103static int mpc8xxx_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
104{
105 struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
106 struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
107 unsigned long flags;
108
109 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
110
111 clrbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio));
112
113 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
114
115 return 0;
116}
117
118static int mpc8xxx_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
119{
120 struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
121 struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
122 unsigned long flags;
123
124 mpc8xxx_gpio_set(gc, gpio, val);
125
126 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
127
128 setbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio));
129
130 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
131
132 return 0;
133}
134
Wolfram Sang28538df2011-12-13 10:12:48 +0100135static int mpc5121_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
136{
137 /* GPIO 28..31 are input only on MPC5121 */
138 if (gpio >= 28)
139 return -EINVAL;
140
141 return mpc8xxx_gpio_dir_out(gc, gpio, val);
142}
143
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100144static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
145{
146 struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
147 struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
148
149 if (mpc8xxx_gc->irq && offset < MPC8XXX_GPIO_PINS)
150 return irq_create_mapping(mpc8xxx_gc->irq, offset);
151 else
152 return -ENXIO;
153}
154
155static void mpc8xxx_gpio_irq_cascade(unsigned int irq, struct irq_desc *desc)
156{
Thomas Gleixnerec775d02011-03-25 16:45:20 +0100157 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_desc_get_handler_data(desc);
Felix Radenskycfadd832011-10-11 10:24:21 +0200158 struct irq_chip *chip = irq_desc_get_chip(desc);
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100159 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
160 unsigned int mask;
161
162 mask = in_be32(mm->regs + GPIO_IER) & in_be32(mm->regs + GPIO_IMR);
163 if (mask)
164 generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq,
165 32 - ffs(mask)));
Thomas Gleixnerd6de85e2012-05-03 12:22:06 +0200166 if (chip->irq_eoi)
167 chip->irq_eoi(&desc->irq_data);
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100168}
169
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000170static void mpc8xxx_irq_unmask(struct irq_data *d)
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100171{
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000172 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100173 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
174 unsigned long flags;
175
176 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
177
Grant Likely476eb492011-05-04 15:02:15 +1000178 setbits32(mm->regs + GPIO_IMR, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100179
180 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
181}
182
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000183static void mpc8xxx_irq_mask(struct irq_data *d)
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100184{
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000185 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100186 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
187 unsigned long flags;
188
189 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
190
Grant Likely476eb492011-05-04 15:02:15 +1000191 clrbits32(mm->regs + GPIO_IMR, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100192
193 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
194}
195
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000196static void mpc8xxx_irq_ack(struct irq_data *d)
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100197{
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000198 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100199 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
200
Grant Likely476eb492011-05-04 15:02:15 +1000201 out_be32(mm->regs + GPIO_IER, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100202}
203
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000204static int mpc8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100205{
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000206 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100207 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
208 unsigned long flags;
209
210 switch (flow_type) {
211 case IRQ_TYPE_EDGE_FALLING:
212 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
213 setbits32(mm->regs + GPIO_ICR,
Grant Likely476eb492011-05-04 15:02:15 +1000214 mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100215 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
216 break;
217
218 case IRQ_TYPE_EDGE_BOTH:
219 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
220 clrbits32(mm->regs + GPIO_ICR,
Grant Likely476eb492011-05-04 15:02:15 +1000221 mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100222 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
223 break;
224
225 default:
226 return -EINVAL;
227 }
228
229 return 0;
230}
231
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000232static int mpc512x_irq_set_type(struct irq_data *d, unsigned int flow_type)
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +0200233{
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000234 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +0200235 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
Grant Likely476eb492011-05-04 15:02:15 +1000236 unsigned long gpio = irqd_to_hwirq(d);
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +0200237 void __iomem *reg;
238 unsigned int shift;
239 unsigned long flags;
240
241 if (gpio < 16) {
242 reg = mm->regs + GPIO_ICR;
243 shift = (15 - gpio) * 2;
244 } else {
245 reg = mm->regs + GPIO_ICR2;
246 shift = (15 - (gpio % 16)) * 2;
247 }
248
249 switch (flow_type) {
250 case IRQ_TYPE_EDGE_FALLING:
251 case IRQ_TYPE_LEVEL_LOW:
252 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
253 clrsetbits_be32(reg, 3 << shift, 2 << shift);
254 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
255 break;
256
257 case IRQ_TYPE_EDGE_RISING:
258 case IRQ_TYPE_LEVEL_HIGH:
259 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
260 clrsetbits_be32(reg, 3 << shift, 1 << shift);
261 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
262 break;
263
264 case IRQ_TYPE_EDGE_BOTH:
265 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
266 clrbits32(reg, 3 << shift);
267 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
268 break;
269
270 default:
271 return -EINVAL;
272 }
273
274 return 0;
275}
276
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100277static struct irq_chip mpc8xxx_irq_chip = {
278 .name = "mpc8xxx-gpio",
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000279 .irq_unmask = mpc8xxx_irq_unmask,
280 .irq_mask = mpc8xxx_irq_mask,
281 .irq_ack = mpc8xxx_irq_ack,
282 .irq_set_type = mpc8xxx_irq_set_type,
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100283};
284
Grant Likelybae1d8f2012-02-14 14:06:50 -0700285static int mpc8xxx_gpio_irq_map(struct irq_domain *h, unsigned int virq,
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100286 irq_hw_number_t hw)
287{
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +0200288 struct mpc8xxx_gpio_chip *mpc8xxx_gc = h->host_data;
289
290 if (mpc8xxx_gc->of_dev_id_data)
Lennert Buytenhek94347cb2011-03-08 22:26:58 +0000291 mpc8xxx_irq_chip.irq_set_type = mpc8xxx_gc->of_dev_id_data;
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +0200292
Thomas Gleixnerec775d02011-03-25 16:45:20 +0100293 irq_set_chip_data(virq, h->host_data);
294 irq_set_chip_and_handler(virq, &mpc8xxx_irq_chip, handle_level_irq);
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100295
296 return 0;
297}
298
Grant Likelybae1d8f2012-02-14 14:06:50 -0700299static struct irq_domain_ops mpc8xxx_gpio_irq_ops = {
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100300 .map = mpc8xxx_gpio_irq_map,
Grant Likelyff8c3ab2012-01-24 17:09:13 -0700301 .xlate = irq_domain_xlate_twocell,
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100302};
303
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +0200304static struct of_device_id mpc8xxx_gpio_ids[] __initdata = {
305 { .compatible = "fsl,mpc8349-gpio", },
306 { .compatible = "fsl,mpc8572-gpio", },
307 { .compatible = "fsl,mpc8610-gpio", },
308 { .compatible = "fsl,mpc5121-gpio", .data = mpc512x_irq_set_type, },
Kumar Gala15a51482011-10-22 16:20:42 -0500309 { .compatible = "fsl,pq3-gpio", },
Anatolij Gustschind1dcfbb2011-01-08 16:51:16 +0100310 { .compatible = "fsl,qoriq-gpio", },
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +0200311 {}
312};
313
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +0200314static void __init mpc8xxx_add_controller(struct device_node *np)
315{
316 struct mpc8xxx_gpio_chip *mpc8xxx_gc;
317 struct of_mm_gpio_chip *mm_gc;
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +0200318 struct gpio_chip *gc;
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +0200319 const struct of_device_id *id;
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100320 unsigned hwirq;
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +0200321 int ret;
322
323 mpc8xxx_gc = kzalloc(sizeof(*mpc8xxx_gc), GFP_KERNEL);
324 if (!mpc8xxx_gc) {
325 ret = -ENOMEM;
326 goto err;
327 }
328
329 spin_lock_init(&mpc8xxx_gc->lock);
330
331 mm_gc = &mpc8xxx_gc->mm_gc;
Anton Vorontsova19e3da2010-06-08 07:48:16 -0600332 gc = &mm_gc->gc;
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +0200333
334 mm_gc->save_regs = mpc8xxx_gpio_save_regs;
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +0200335 gc->ngpio = MPC8XXX_GPIO_PINS;
336 gc->direction_input = mpc8xxx_gpio_dir_in;
Wolfram Sang28538df2011-12-13 10:12:48 +0100337 gc->direction_output = of_device_is_compatible(np, "fsl,mpc5121-gpio") ?
338 mpc5121_gpio_dir_out : mpc8xxx_gpio_dir_out;
339 gc->get = of_device_is_compatible(np, "fsl,mpc8572-gpio") ?
340 mpc8572_gpio_get : mpc8xxx_gpio_get;
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +0200341 gc->set = mpc8xxx_gpio_set;
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100342 gc->to_irq = mpc8xxx_gpio_to_irq;
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +0200343
344 ret = of_mm_gpiochip_add(np, mm_gc);
345 if (ret)
346 goto err;
347
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100348 hwirq = irq_of_parse_and_map(np, 0);
349 if (hwirq == NO_IRQ)
350 goto skip_irq;
351
Grant Likelya8db8cf2012-02-14 14:06:54 -0700352 mpc8xxx_gc->irq = irq_domain_add_linear(np, MPC8XXX_GPIO_PINS,
353 &mpc8xxx_gpio_irq_ops, mpc8xxx_gc);
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100354 if (!mpc8xxx_gc->irq)
355 goto skip_irq;
356
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +0200357 id = of_match_node(mpc8xxx_gpio_ids, np);
358 if (id)
359 mpc8xxx_gc->of_dev_id_data = id->data;
360
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100361 /* ack and mask all irqs */
362 out_be32(mm_gc->regs + GPIO_IER, 0xffffffff);
363 out_be32(mm_gc->regs + GPIO_IMR, 0);
364
Thomas Gleixnerec775d02011-03-25 16:45:20 +0100365 irq_set_handler_data(hwirq, mpc8xxx_gc);
366 irq_set_chained_handler(hwirq, mpc8xxx_gpio_irq_cascade);
Peter Korsgaard345e5c82010-01-07 17:57:46 +0100367
368skip_irq:
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +0200369 return;
370
371err:
372 pr_err("%s: registration failed with status %d\n",
373 np->full_name, ret);
374 kfree(mpc8xxx_gc);
375
376 return;
377}
378
379static int __init mpc8xxx_add_gpiochips(void)
380{
381 struct device_node *np;
382
Anatolij Gustschine39d5ef2010-08-09 07:58:48 +0200383 for_each_matching_node(np, mpc8xxx_gpio_ids)
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +0200384 mpc8xxx_add_controller(np);
385
Peter Korsgaard1e16dfc2008-09-23 17:35:38 +0200386 return 0;
387}
388arch_initcall(mpc8xxx_add_gpiochips);