David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2011, 2012 Cavium Inc. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/platform_device.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/gpio.h> |
| 13 | #include <linux/io.h> |
| 14 | |
| 15 | #include <asm/octeon/octeon.h> |
| 16 | #include <asm/octeon/cvmx-gpio-defs.h> |
| 17 | |
| 18 | #define RX_DAT 0x80 |
| 19 | #define TX_SET 0x88 |
| 20 | #define TX_CLEAR 0x90 |
| 21 | /* |
| 22 | * The address offset of the GPIO configuration register for a given |
| 23 | * line. |
| 24 | */ |
| 25 | static unsigned int bit_cfg_reg(unsigned int offset) |
| 26 | { |
| 27 | /* |
| 28 | * The register stride is 8, with a discontinuity after the |
| 29 | * first 16. |
| 30 | */ |
| 31 | if (offset < 16) |
| 32 | return 8 * offset; |
| 33 | else |
| 34 | return 8 * (offset - 16) + 0x100; |
| 35 | } |
| 36 | |
| 37 | struct octeon_gpio { |
| 38 | struct gpio_chip chip; |
| 39 | u64 register_base; |
| 40 | }; |
| 41 | |
| 42 | static int octeon_gpio_dir_in(struct gpio_chip *chip, unsigned offset) |
| 43 | { |
Linus Walleij | f5cc554 | 2015-12-07 11:13:27 +0100 | [diff] [blame] | 44 | struct octeon_gpio *gpio = gpiochip_get_data(chip); |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 45 | |
| 46 | cvmx_write_csr(gpio->register_base + bit_cfg_reg(offset), 0); |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | static void octeon_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| 51 | { |
Linus Walleij | f5cc554 | 2015-12-07 11:13:27 +0100 | [diff] [blame] | 52 | struct octeon_gpio *gpio = gpiochip_get_data(chip); |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 53 | u64 mask = 1ull << offset; |
| 54 | u64 reg = gpio->register_base + (value ? TX_SET : TX_CLEAR); |
| 55 | cvmx_write_csr(reg, mask); |
| 56 | } |
| 57 | |
| 58 | static int octeon_gpio_dir_out(struct gpio_chip *chip, unsigned offset, |
| 59 | int value) |
| 60 | { |
Linus Walleij | f5cc554 | 2015-12-07 11:13:27 +0100 | [diff] [blame] | 61 | struct octeon_gpio *gpio = gpiochip_get_data(chip); |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 62 | union cvmx_gpio_bit_cfgx cfgx; |
| 63 | |
| 64 | octeon_gpio_set(chip, offset, value); |
| 65 | |
| 66 | cfgx.u64 = 0; |
| 67 | cfgx.s.tx_oe = 1; |
| 68 | |
| 69 | cvmx_write_csr(gpio->register_base + bit_cfg_reg(offset), cfgx.u64); |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static int octeon_gpio_get(struct gpio_chip *chip, unsigned offset) |
| 74 | { |
Linus Walleij | f5cc554 | 2015-12-07 11:13:27 +0100 | [diff] [blame] | 75 | struct octeon_gpio *gpio = gpiochip_get_data(chip); |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 76 | u64 read_bits = cvmx_read_csr(gpio->register_base + RX_DAT); |
| 77 | |
| 78 | return ((1ull << offset) & read_bits) != 0; |
| 79 | } |
| 80 | |
| 81 | static int octeon_gpio_probe(struct platform_device *pdev) |
| 82 | { |
| 83 | struct octeon_gpio *gpio; |
| 84 | struct gpio_chip *chip; |
| 85 | struct resource *res_mem; |
Axel Lin | 592569d | 2016-03-18 21:05:16 +0800 | [diff] [blame^] | 86 | void __iomem *reg_base; |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 87 | int err = 0; |
| 88 | |
| 89 | gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); |
| 90 | if (!gpio) |
| 91 | return -ENOMEM; |
| 92 | chip = &gpio->chip; |
| 93 | |
| 94 | res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Axel Lin | 592569d | 2016-03-18 21:05:16 +0800 | [diff] [blame^] | 95 | reg_base = devm_ioremap_resource(&pdev->dev, res_mem); |
| 96 | if (IS_ERR(reg_base)) |
| 97 | return PTR_ERR(reg_base); |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 98 | |
Axel Lin | 592569d | 2016-03-18 21:05:16 +0800 | [diff] [blame^] | 99 | gpio->register_base = (u64)reg_base; |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 100 | pdev->dev.platform_data = chip; |
| 101 | chip->label = "octeon-gpio"; |
Linus Walleij | 58383c7 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 102 | chip->parent = &pdev->dev; |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 103 | chip->owner = THIS_MODULE; |
| 104 | chip->base = 0; |
Linus Walleij | 9fb1f39 | 2013-12-04 14:42:46 +0100 | [diff] [blame] | 105 | chip->can_sleep = false; |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 106 | chip->ngpio = 20; |
| 107 | chip->direction_input = octeon_gpio_dir_in; |
| 108 | chip->get = octeon_gpio_get; |
| 109 | chip->direction_output = octeon_gpio_dir_out; |
| 110 | chip->set = octeon_gpio_set; |
Laxman Dewangan | 1533d4f | 2016-02-22 17:43:28 +0530 | [diff] [blame] | 111 | err = devm_gpiochip_add_data(&pdev->dev, chip, gpio); |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 112 | if (err) |
Axel Lin | 592569d | 2016-03-18 21:05:16 +0800 | [diff] [blame^] | 113 | return err; |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 114 | |
| 115 | dev_info(&pdev->dev, "OCTEON GPIO driver probed.\n"); |
Axel Lin | 592569d | 2016-03-18 21:05:16 +0800 | [diff] [blame^] | 116 | return 0; |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 117 | } |
| 118 | |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 119 | static struct of_device_id octeon_gpio_match[] = { |
| 120 | { |
| 121 | .compatible = "cavium,octeon-3860-gpio", |
| 122 | }, |
| 123 | {}, |
| 124 | }; |
| 125 | MODULE_DEVICE_TABLE(of, octeon_gpio_match); |
| 126 | |
| 127 | static struct platform_driver octeon_gpio_driver = { |
| 128 | .driver = { |
| 129 | .name = "octeon_gpio", |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 130 | .of_match_table = octeon_gpio_match, |
| 131 | }, |
| 132 | .probe = octeon_gpio_probe, |
David Daney | aca58a6 | 2013-07-29 14:29:10 -0700 | [diff] [blame] | 133 | }; |
| 134 | |
| 135 | module_platform_driver(octeon_gpio_driver); |
| 136 | |
| 137 | MODULE_DESCRIPTION("Cavium Inc. OCTEON GPIO Driver"); |
| 138 | MODULE_AUTHOR("David Daney"); |
| 139 | MODULE_LICENSE("GPL"); |