1 From 61ac7d9b4228de8c332900902c2b93189b042eab Mon Sep 17 00:00:00 2001
2 From: John Crispin <blogic@openwrt.org>
3 Date: Sun, 27 Jul 2014 11:00:32 +0100
4 Subject: [PATCH 28/53] GPIO: ralink: add mt7621 gpio controller
6 Signed-off-by: John Crispin <blogic@openwrt.org>
8 arch/mips/Kconfig | 3 +
9 drivers/gpio/Kconfig | 6 +
10 drivers/gpio/Makefile | 1 +
11 drivers/gpio/gpio-mt7621.c | 354 ++++++++++++++++++++++++++++++++++++++++++++
12 4 files changed, 364 insertions(+)
13 create mode 100644 drivers/gpio/gpio-mt7621.c
15 diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
16 index 0098bff..94ea345 100644
17 --- a/arch/mips/Kconfig
18 +++ b/arch/mips/Kconfig
19 @@ -559,6 +559,9 @@ config RALINK
20 select RESET_CONTROLLER
23 + select ARCH_HAS_RESET_CONTROLLER
24 + select RESET_CONTROLLER
25 + select ARCH_REQUIRE_GPIOLIB
28 bool "SGI IP22 (Indy/Indigo2)"
29 diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
30 index 4a3e7df..13f860c 100644
31 --- a/drivers/gpio/Kconfig
32 +++ b/drivers/gpio/Kconfig
33 @@ -269,6 +269,12 @@ config GPIO_MB86S7X
35 Say yes here to support the GPIO controller in Fujitsu MB86S70 SoCs.
38 + bool "Mediatek GPIO Support"
39 + depends on SOC_MT7620 || SOC_MT7621
41 + Say yes here to support the Mediatek SoC GPIO device
44 bool "Lantiq Memory mapped GPIOs"
45 depends on LANTIQ && SOC_XWAY
46 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
47 index 13448d78..5563d6e 100644
48 --- a/drivers/gpio/Makefile
49 +++ b/drivers/gpio/Makefile
50 @@ -119,3 +119,4 @@ obj-$(CONFIG_GPIO_XTENSA) += gpio-xtensa.o
51 obj-$(CONFIG_GPIO_ZEVIO) += gpio-zevio.o
52 obj-$(CONFIG_GPIO_ZYNQ) += gpio-zynq.o
53 obj-$(CONFIG_GPIO_ZX) += gpio-zx.o
54 +obj-$(CONFIG_GPIO_MT7621) += gpio-mt7621.o
55 diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c
57 index 0000000..7a98b94
59 +++ b/drivers/gpio/gpio-mt7621.c
62 + * This program is free software; you can redistribute it and/or modify it
63 + * under the terms of the GNU General Public License version 2 as published
64 + * by the Free Software Foundation.
66 + * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
67 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
70 +#include <linux/io.h>
71 +#include <linux/err.h>
72 +#include <linux/gpio.h>
73 +#include <linux/module.h>
74 +#include <linux/of_irq.h>
75 +#include <linux/spinlock.h>
76 +#include <linux/irqdomain.h>
77 +#include <linux/interrupt.h>
78 +#include <linux/platform_device.h>
80 +#define MTK_MAX_BANK 3
81 +#define MTK_BANK_WIDTH 32
83 +enum mediatek_gpio_reg {
97 +static void __iomem *mediatek_gpio_membase;
98 +static int mediatek_gpio_irq;
99 +static struct irq_domain *mediatek_gpio_irq_domain;
100 +static atomic_t irq_refcount = ATOMIC_INIT(0);
103 + struct gpio_chip chip;
108 +} *gc_map[MTK_MAX_BANK];
110 +static inline struct mtk_gc
111 +*to_mediatek_gpio(struct gpio_chip *chip)
113 + struct mtk_gc *mgc;
115 + mgc = container_of(chip, struct mtk_gc, chip);
121 +mtk_gpio_w32(struct mtk_gc *rg, u8 reg, u32 val)
123 + iowrite32(val, mediatek_gpio_membase + (reg * 0x10) + (rg->bank * 0x4));
127 +mtk_gpio_r32(struct mtk_gc *rg, u8 reg)
129 + return ioread32(mediatek_gpio_membase + (reg * 0x10) + (rg->bank * 0x4));
133 +mediatek_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
135 + struct mtk_gc *rg = to_mediatek_gpio(chip);
137 + mtk_gpio_w32(rg, (value) ? GPIO_REG_DSET : GPIO_REG_DCLR, BIT(offset));
141 +mediatek_gpio_get(struct gpio_chip *chip, unsigned offset)
143 + struct mtk_gc *rg = to_mediatek_gpio(chip);
145 + return !!(mtk_gpio_r32(rg, GPIO_REG_DATA) & BIT(offset));
149 +mediatek_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
151 + struct mtk_gc *rg = to_mediatek_gpio(chip);
152 + unsigned long flags;
155 + spin_lock_irqsave(&rg->lock, flags);
156 + t = mtk_gpio_r32(rg, GPIO_REG_CTRL);
158 + mtk_gpio_w32(rg, GPIO_REG_CTRL, t);
159 + spin_unlock_irqrestore(&rg->lock, flags);
165 +mediatek_gpio_direction_output(struct gpio_chip *chip,
166 + unsigned offset, int value)
168 + struct mtk_gc *rg = to_mediatek_gpio(chip);
169 + unsigned long flags;
172 + spin_lock_irqsave(&rg->lock, flags);
173 + t = mtk_gpio_r32(rg, GPIO_REG_CTRL);
175 + mtk_gpio_w32(rg, GPIO_REG_CTRL, t);
176 + mediatek_gpio_set(chip, offset, value);
177 + spin_unlock_irqrestore(&rg->lock, flags);
183 +mediatek_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
185 + struct mtk_gc *rg = to_mediatek_gpio(chip);
186 + unsigned long flags;
189 + spin_lock_irqsave(&rg->lock, flags);
190 + t = mtk_gpio_r32(rg, GPIO_REG_CTRL);
191 + spin_unlock_irqrestore(&rg->lock, flags);
193 + if (t & BIT(offset))
200 +mediatek_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
202 + struct mtk_gc *rg = to_mediatek_gpio(chip);
204 + return irq_create_mapping(mediatek_gpio_irq_domain, pin + (rg->bank * MTK_BANK_WIDTH));
208 +mediatek_gpio_bank_probe(struct platform_device *pdev, struct device_node *bank)
210 + const __be32 *id = of_get_property(bank, "reg", NULL);
211 + struct mtk_gc *rg = devm_kzalloc(&pdev->dev,
212 + sizeof(struct mtk_gc), GFP_KERNEL);
214 + if (!rg || !id || be32_to_cpu(*id) > MTK_MAX_BANK)
217 + gc_map[be32_to_cpu(*id)] = rg;
219 + memset(rg, 0, sizeof(struct mtk_gc));
221 + spin_lock_init(&rg->lock);
223 + rg->chip.dev = &pdev->dev;
224 + rg->chip.label = dev_name(&pdev->dev);
225 + rg->chip.of_node = bank;
226 + rg->chip.base = MTK_BANK_WIDTH * be32_to_cpu(*id);
227 + rg->chip.ngpio = MTK_BANK_WIDTH;
228 + rg->chip.direction_input = mediatek_gpio_direction_input;
229 + rg->chip.direction_output = mediatek_gpio_direction_output;
230 + rg->chip.get_direction = mediatek_gpio_get_direction;
231 + rg->chip.get = mediatek_gpio_get;
232 + rg->chip.set = mediatek_gpio_set;
233 + if (mediatek_gpio_irq_domain)
234 + rg->chip.to_irq = mediatek_gpio_to_irq;
235 + rg->bank = be32_to_cpu(*id);
237 + /* set polarity to low for all gpios */
238 + mtk_gpio_w32(rg, GPIO_REG_POL, 0);
240 + dev_info(&pdev->dev, "registering %d gpios\n", rg->chip.ngpio);
242 + return gpiochip_add(&rg->chip);
246 +mediatek_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
250 + for (i = 0; i < MTK_MAX_BANK; i++) {
251 + struct mtk_gc *rg = gc_map[i];
252 + unsigned long pending;
258 + pending = mtk_gpio_r32(rg, GPIO_REG_STAT);
260 + for_each_set_bit(bit, &pending, MTK_BANK_WIDTH) {
261 + u32 map = irq_find_mapping(mediatek_gpio_irq_domain, (MTK_BANK_WIDTH * i) + bit);
263 + generic_handle_irq(map);
264 + mtk_gpio_w32(rg, GPIO_REG_STAT, BIT(bit));
270 +mediatek_gpio_irq_unmask(struct irq_data *d)
272 + int pin = d->hwirq;
273 + int bank = pin / 32;
274 + struct mtk_gc *rg = gc_map[bank];
275 + unsigned long flags;
281 + rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
282 + fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
284 + spin_lock_irqsave(&rg->lock, flags);
285 + mtk_gpio_w32(rg, GPIO_REG_REDGE, rise | (BIT(d->hwirq) & rg->rising));
286 + mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall | (BIT(d->hwirq) & rg->falling));
287 + spin_unlock_irqrestore(&rg->lock, flags);
291 +mediatek_gpio_irq_mask(struct irq_data *d)
293 + int pin = d->hwirq;
294 + int bank = pin / 32;
295 + struct mtk_gc *rg = gc_map[bank];
296 + unsigned long flags;
302 + rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
303 + fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
305 + spin_lock_irqsave(&rg->lock, flags);
306 + mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall & ~BIT(d->hwirq));
307 + mtk_gpio_w32(rg, GPIO_REG_REDGE, rise & ~BIT(d->hwirq));
308 + spin_unlock_irqrestore(&rg->lock, flags);
312 +mediatek_gpio_irq_type(struct irq_data *d, unsigned int type)
314 + int pin = d->hwirq;
315 + int bank = pin / 32;
316 + struct mtk_gc *rg = gc_map[bank];
317 + u32 mask = BIT(d->hwirq);
322 + if (type == IRQ_TYPE_PROBE) {
323 + if ((rg->rising | rg->falling) & mask)
326 + type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
329 + if (type & IRQ_TYPE_EDGE_RISING)
330 + rg->rising |= mask;
332 + rg->rising &= ~mask;
334 + if (type & IRQ_TYPE_EDGE_FALLING)
335 + rg->falling |= mask;
337 + rg->falling &= ~mask;
342 +static struct irq_chip mediatek_gpio_irq_chip = {
344 + .irq_unmask = mediatek_gpio_irq_unmask,
345 + .irq_mask = mediatek_gpio_irq_mask,
346 + .irq_mask_ack = mediatek_gpio_irq_mask,
347 + .irq_set_type = mediatek_gpio_irq_type,
351 +mediatek_gpio_gpio_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
353 + irq_set_chip_and_handler(irq, &mediatek_gpio_irq_chip, handle_level_irq);
354 + irq_set_handler_data(irq, d);
359 +static const struct irq_domain_ops irq_domain_ops = {
360 + .xlate = irq_domain_xlate_onecell,
361 + .map = mediatek_gpio_gpio_map,
365 +mediatek_gpio_probe(struct platform_device *pdev)
367 + struct device_node *bank, *np = pdev->dev.of_node;
368 + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
370 + mediatek_gpio_membase = devm_ioremap_resource(&pdev->dev, res);
371 + if (IS_ERR(mediatek_gpio_membase))
372 + return PTR_ERR(mediatek_gpio_membase);
374 + mediatek_gpio_irq = irq_of_parse_and_map(np, 0);
375 + if (mediatek_gpio_irq) {
376 + mediatek_gpio_irq_domain = irq_domain_add_linear(np,
377 + MTK_MAX_BANK * MTK_BANK_WIDTH,
378 + &irq_domain_ops, NULL);
379 + if (!mediatek_gpio_irq_domain)
380 + dev_err(&pdev->dev, "irq_domain_add_linear failed\n");
383 + for_each_child_of_node(np, bank)
384 + if (of_device_is_compatible(bank, "mtk,mt7621-gpio-bank"))
385 + mediatek_gpio_bank_probe(pdev, bank);
387 + if (mediatek_gpio_irq_domain)
388 + irq_set_chained_handler(mediatek_gpio_irq, mediatek_gpio_irq_handler);
393 +static const struct of_device_id mediatek_gpio_match[] = {
394 + { .compatible = "mtk,mt7621-gpio" },
397 +MODULE_DEVICE_TABLE(of, mediatek_gpio_match);
399 +static struct platform_driver mediatek_gpio_driver = {
400 + .probe = mediatek_gpio_probe,
402 + .name = "mt7621_gpio",
403 + .owner = THIS_MODULE,
404 + .of_match_table = mediatek_gpio_match,
409 +mediatek_gpio_init(void)
411 + return platform_driver_register(&mediatek_gpio_driver);
414 +subsys_initcall(mediatek_gpio_init);