2 * GPIOs on MPC512x/8349/8572/8610 and compatible
4 * Copyright (C) 2008 Peter Korsgaard <jacmet@sunsite.dk>
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.
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/spinlock.h>
16 #include <linux/of_gpio.h>
17 #include <linux/gpio.h>
18 #include <linux/slab.h>
19 #include <linux/irq.h>
21 #define MPC8XXX_GPIO_PINS 32
29 #define GPIO_ICR2 0x18
31 struct mpc8xxx_gpio_chip {
32 struct of_mm_gpio_chip mm_gc;
36 * shadowed data register to be able to clear/set output pins in
37 * open drain mode safely
40 struct irq_domain *irq;
41 const void *of_dev_id_data;
44 static inline u32 mpc8xxx_gpio2mask(unsigned int gpio)
46 return 1u << (MPC8XXX_GPIO_PINS - 1 - gpio);
49 static inline struct mpc8xxx_gpio_chip *
50 to_mpc8xxx_gpio_chip(struct of_mm_gpio_chip *mm)
52 return container_of(mm, struct mpc8xxx_gpio_chip, mm_gc);
55 static void mpc8xxx_gpio_save_regs(struct of_mm_gpio_chip *mm)
57 struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
59 mpc8xxx_gc->data = in_be32(mm->regs + GPIO_DAT);
62 /* 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.
67 static int mpc8572_gpio_get(struct gpio_chip *gc, unsigned int gpio)
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);
73 val = in_be32(mm->regs + GPIO_DAT) & ~in_be32(mm->regs + GPIO_DIR);
75 return (val | mpc8xxx_gc->data) & mpc8xxx_gpio2mask(gpio);
78 static int mpc8xxx_gpio_get(struct gpio_chip *gc, unsigned int gpio)
80 struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
82 return in_be32(mm->regs + GPIO_DAT) & mpc8xxx_gpio2mask(gpio);
85 static void mpc8xxx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
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);
91 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
94 mpc8xxx_gc->data |= mpc8xxx_gpio2mask(gpio);
96 mpc8xxx_gc->data &= ~mpc8xxx_gpio2mask(gpio);
98 out_be32(mm->regs + GPIO_DAT, mpc8xxx_gc->data);
100 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
103 static int mpc8xxx_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
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);
109 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
111 clrbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio));
113 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
118 static int mpc8xxx_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
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);
124 mpc8xxx_gpio_set(gc, gpio, val);
126 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
128 setbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio));
130 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
135 static int mpc5121_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
137 /* GPIO 28..31 are input only on MPC5121 */
141 return mpc8xxx_gpio_dir_out(gc, gpio, val);
144 static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
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);
149 if (mpc8xxx_gc->irq && offset < MPC8XXX_GPIO_PINS)
150 return irq_create_mapping(mpc8xxx_gc->irq, offset);
155 static void mpc8xxx_gpio_irq_cascade(unsigned int irq, struct irq_desc *desc)
157 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_desc_get_handler_data(desc);
158 struct irq_chip *chip = irq_desc_get_chip(desc);
159 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
162 mask = in_be32(mm->regs + GPIO_IER) & in_be32(mm->regs + GPIO_IMR);
164 generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq,
167 chip->irq_eoi(&desc->irq_data);
170 static void mpc8xxx_irq_unmask(struct irq_data *d)
172 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
173 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
176 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
178 setbits32(mm->regs + GPIO_IMR, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
180 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
183 static void mpc8xxx_irq_mask(struct irq_data *d)
185 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
186 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
189 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
191 clrbits32(mm->regs + GPIO_IMR, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
193 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
196 static void mpc8xxx_irq_ack(struct irq_data *d)
198 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
199 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
201 out_be32(mm->regs + GPIO_IER, mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
204 static int mpc8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
206 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
207 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
211 case IRQ_TYPE_EDGE_FALLING:
212 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
213 setbits32(mm->regs + GPIO_ICR,
214 mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
215 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
218 case IRQ_TYPE_EDGE_BOTH:
219 spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
220 clrbits32(mm->regs + GPIO_ICR,
221 mpc8xxx_gpio2mask(irqd_to_hwirq(d)));
222 spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
232 static int mpc512x_irq_set_type(struct irq_data *d, unsigned int flow_type)
234 struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
235 struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc;
236 unsigned long gpio = irqd_to_hwirq(d);
242 reg = mm->regs + GPIO_ICR;
243 shift = (15 - gpio) * 2;
245 reg = mm->regs + GPIO_ICR2;
246 shift = (15 - (gpio % 16)) * 2;
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);
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);
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);
277 static struct irq_chip mpc8xxx_irq_chip = {
278 .name = "mpc8xxx-gpio",
279 .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,
285 static int mpc8xxx_gpio_irq_map(struct irq_domain *h, unsigned int virq,
288 struct mpc8xxx_gpio_chip *mpc8xxx_gc = h->host_data;
290 if (mpc8xxx_gc->of_dev_id_data)
291 mpc8xxx_irq_chip.irq_set_type = mpc8xxx_gc->of_dev_id_data;
293 irq_set_chip_data(virq, h->host_data);
294 irq_set_chip_and_handler(virq, &mpc8xxx_irq_chip, handle_level_irq);
295 irq_set_irq_type(virq, IRQ_TYPE_NONE);
300 static struct irq_domain_ops mpc8xxx_gpio_irq_ops = {
301 .map = mpc8xxx_gpio_irq_map,
302 .xlate = irq_domain_xlate_twocell,
305 static struct of_device_id mpc8xxx_gpio_ids[] __initdata = {
306 { .compatible = "fsl,mpc8349-gpio", },
307 { .compatible = "fsl,mpc8572-gpio", },
308 { .compatible = "fsl,mpc8610-gpio", },
309 { .compatible = "fsl,mpc5121-gpio", .data = mpc512x_irq_set_type, },
310 { .compatible = "fsl,pq3-gpio", },
311 { .compatible = "fsl,qoriq-gpio", },
315 static void __init mpc8xxx_add_controller(struct device_node *np)
317 struct mpc8xxx_gpio_chip *mpc8xxx_gc;
318 struct of_mm_gpio_chip *mm_gc;
319 struct gpio_chip *gc;
320 const struct of_device_id *id;
324 mpc8xxx_gc = kzalloc(sizeof(*mpc8xxx_gc), GFP_KERNEL);
330 spin_lock_init(&mpc8xxx_gc->lock);
332 mm_gc = &mpc8xxx_gc->mm_gc;
335 mm_gc->save_regs = mpc8xxx_gpio_save_regs;
336 gc->ngpio = MPC8XXX_GPIO_PINS;
337 gc->direction_input = mpc8xxx_gpio_dir_in;
338 gc->direction_output = of_device_is_compatible(np, "fsl,mpc5121-gpio") ?
339 mpc5121_gpio_dir_out : mpc8xxx_gpio_dir_out;
340 gc->get = of_device_is_compatible(np, "fsl,mpc8572-gpio") ?
341 mpc8572_gpio_get : mpc8xxx_gpio_get;
342 gc->set = mpc8xxx_gpio_set;
343 gc->to_irq = mpc8xxx_gpio_to_irq;
345 ret = of_mm_gpiochip_add(np, mm_gc);
349 hwirq = irq_of_parse_and_map(np, 0);
353 mpc8xxx_gc->irq = irq_domain_add_linear(np, MPC8XXX_GPIO_PINS,
354 &mpc8xxx_gpio_irq_ops, mpc8xxx_gc);
355 if (!mpc8xxx_gc->irq)
358 id = of_match_node(mpc8xxx_gpio_ids, np);
360 mpc8xxx_gc->of_dev_id_data = id->data;
362 /* ack and mask all irqs */
363 out_be32(mm_gc->regs + GPIO_IER, 0xffffffff);
364 out_be32(mm_gc->regs + GPIO_IMR, 0);
366 irq_set_handler_data(hwirq, mpc8xxx_gc);
367 irq_set_chained_handler(hwirq, mpc8xxx_gpio_irq_cascade);
373 pr_err("%s: registration failed with status %d\n",
380 static int __init mpc8xxx_add_gpiochips(void)
382 struct device_node *np;
384 for_each_matching_node(np, mpc8xxx_gpio_ids)
385 mpc8xxx_add_controller(np);
389 arch_initcall(mpc8xxx_add_gpiochips);