projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 0299b77b JJ |
1 | /* |
| 2 | * MOXA ART SoCs GPIO driver. | |
| 3 | * | |
| 4 | * Copyright (C) 2013 Jonas Jensen | |
| 5 | * | |
| 6 | * Jonas Jensen <jonas.jensen@gmail.com> | |
| 7 | * | |
| 8 | * This file is licensed under the terms of the GNU General Public | |
| 9 | * License version 2. This program is licensed "as is" without any | |
| 10 | * warranty of any kind, whether express or implied. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/err.h> | |
| 14 | #include <linux/init.h> | |
| 15 | #include <linux/irq.h> | |
| 16 | #include <linux/io.h> | |
| 17 | #include <linux/gpio.h> | |
| 18 | #include <linux/platform_device.h> | |
| 19 | #include <linux/module.h> | |
| 20 | #include <linux/of_address.h> | |
| 21 | #include <linux/of_gpio.h> | |
| 22 | #include <linux/pinctrl/consumer.h> | |
| 23 | #include <linux/delay.h> | |
| 24 | #include <linux/timer.h> | |
| 25 | #include <linux/bitops.h> | |
| 3c01b9a8 | 26 | #include <linux/basic_mmio_gpio.h> |
| 0299b77b JJ |
27 | |
| 28 | #define GPIO_DATA_OUT 0x00 | |
| 29 | #define GPIO_DATA_IN 0x04 | |
| 30 | #define GPIO_PIN_DIRECTION 0x08 | |
| 31 | ||
| 0299b77b JJ |
32 | static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset) |
| 33 | { | |
| 34 | return pinctrl_request_gpio(offset); | |
| 35 | } | |
| 36 | ||
| 37 | static void moxart_gpio_free(struct gpio_chip *chip, unsigned offset) | |
| 38 | { | |
| 39 | pinctrl_free_gpio(offset); | |
| 40 | } | |
| 41 | ||
| 0299b77b JJ |
42 | static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset) |
| 43 | { | |
| 3c01b9a8 KP |
44 | struct bgpio_chip *bgc = to_bgpio_chip(chip); |
| 45 | u32 ret = bgc->read_reg(bgc->reg_dir); | |
| 0299b77b JJ |
46 | |
| 47 | if (ret & BIT(offset)) | |
| 3c01b9a8 | 48 | return !!(bgc->read_reg(bgc->reg_set) & BIT(offset)); |
| 0299b77b | 49 | else |
| 3c01b9a8 | 50 | return !!(bgc->read_reg(bgc->reg_dat) & BIT(offset)); |
| c9e8dbad AL |
51 | } |
| 52 | ||
| 0299b77b JJ |
53 | static int moxart_gpio_probe(struct platform_device *pdev) |
| 54 | { | |
| 55 | struct device *dev = &pdev->dev; | |
| 56 | struct resource *res; | |
| 3c01b9a8 KP |
57 | struct bgpio_chip *bgc; |
| 58 | void __iomem *base; | |
| 0299b77b JJ |
59 | int ret; |
| 60 | ||
| 3c01b9a8 KP |
61 | bgc = devm_kzalloc(dev, sizeof(*bgc), GFP_KERNEL); |
| 62 | if (!bgc) | |
| 0299b77b | 63 | return -ENOMEM; |
| 0299b77b JJ |
64 | |
| 65 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 3c01b9a8 KP |
66 | base = devm_ioremap_resource(dev, res); |
| 67 | if (IS_ERR(base)) | |
| 68 | return PTR_ERR(base); | |
| 0299b77b | 69 | |
| 3c01b9a8 KP |
70 | ret = bgpio_init(bgc, dev, 4, base + GPIO_DATA_IN, |
| 71 | base + GPIO_DATA_OUT, NULL, | |
| 72 | base + GPIO_PIN_DIRECTION, NULL, 0); | |
| 73 | if (ret) { | |
| 74 | dev_err(&pdev->dev, "bgpio_init failed\n"); | |
| 75 | return ret; | |
| 76 | } | |
| 0299b77b | 77 | |
| 3c01b9a8 KP |
78 | bgc->gc.label = "moxart-gpio"; |
| 79 | bgc->gc.request = moxart_gpio_request; | |
| 80 | bgc->gc.free = moxart_gpio_free; | |
| 81 | bgc->gc.get = moxart_gpio_get; | |
| 82 | bgc->data = bgc->read_reg(bgc->reg_set); | |
| 83 | bgc->gc.base = 0; | |
| 84 | bgc->gc.ngpio = 32; | |
| 85 | bgc->gc.dev = dev; | |
| 86 | bgc->gc.owner = THIS_MODULE; | |
| 87 | ||
| 88 | ret = gpiochip_add(&bgc->gc); | |
| 0299b77b JJ |
89 | if (ret) { |
| 90 | dev_err(dev, "%s: gpiochip_add failed\n", | |
| 91 | dev->of_node->full_name); | |
| 92 | return ret; | |
| 93 | } | |
| 94 | ||
| 3c01b9a8 | 95 | return ret; |
| 0299b77b JJ |
96 | } |
| 97 | ||
| 98 | static const struct of_device_id moxart_gpio_match[] = { | |
| 99 | { .compatible = "moxa,moxart-gpio" }, | |
| 100 | { } | |
| 101 | }; | |
| 102 | ||
| 103 | static struct platform_driver moxart_gpio_driver = { | |
| 104 | .driver = { | |
| 105 | .name = "moxart-gpio", | |
| 0299b77b JJ |
106 | .of_match_table = moxart_gpio_match, |
| 107 | }, | |
| 108 | .probe = moxart_gpio_probe, | |
| 109 | }; | |
| 110 | module_platform_driver(moxart_gpio_driver); | |
| 111 | ||
| 112 | MODULE_DESCRIPTION("MOXART GPIO chip driver"); | |
| 113 | MODULE_LICENSE("GPL"); | |
| 114 | MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>"); |