1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include <linux/types.h> 4 #include <linux/io.h> 5 #include <linux/bits.h> 6 #include <linux/gpio/driver.h> 7 #include <linux/gpio/generic.h> 8 #include <linux/module.h> 9 #include <linux/platform_device.h> 10 #include <linux/property.h> 11 12 #define AIROHA_GPIO_MAX 32 13 14 /** 15 * struct airoha_gpio_ctrl - Airoha GPIO driver data 16 * @gen_gc: Associated gpio_generic_chip instance. 17 * @data: The data register. 18 * @dir: [0] The direction register for the lower 16 pins. 19 * [1]: The direction register for the higher 16 pins. 20 * @output: The output enable register. 21 */ 22 struct airoha_gpio_ctrl { 23 struct gpio_generic_chip gen_gc; 24 void __iomem *data; 25 void __iomem *dir[2]; 26 void __iomem *output; 27 }; 28 29 static int airoha_dir_set(struct gpio_chip *gc, unsigned int gpio, 30 int val, int out) 31 { 32 struct airoha_gpio_ctrl *ctrl = gpiochip_get_data(gc); 33 u32 dir = ioread32(ctrl->dir[gpio / 16]); 34 u32 output = ioread32(ctrl->output); 35 u32 mask = BIT((gpio % 16) * 2); 36 37 if (out) { 38 dir |= mask; 39 output |= BIT(gpio); 40 } else { 41 dir &= ~mask; 42 output &= ~BIT(gpio); 43 } 44 45 iowrite32(dir, ctrl->dir[gpio / 16]); 46 47 if (out) 48 gpio_generic_chip_set(&ctrl->gen_gc, gpio, val); 49 50 iowrite32(output, ctrl->output); 51 52 return 0; 53 } 54 55 static int airoha_dir_out(struct gpio_chip *gc, unsigned int gpio, 56 int val) 57 { 58 return airoha_dir_set(gc, gpio, val, 1); 59 } 60 61 static int airoha_dir_in(struct gpio_chip *gc, unsigned int gpio) 62 { 63 return airoha_dir_set(gc, gpio, 0, 0); 64 } 65 66 static int airoha_get_dir(struct gpio_chip *gc, unsigned int gpio) 67 { 68 struct airoha_gpio_ctrl *ctrl = gpiochip_get_data(gc); 69 u32 dir = ioread32(ctrl->dir[gpio / 16]); 70 u32 mask = BIT((gpio % 16) * 2); 71 72 return (dir & mask) ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN; 73 } 74 75 static int airoha_gpio_probe(struct platform_device *pdev) 76 { 77 struct gpio_generic_chip_config config = { }; 78 struct device *dev = &pdev->dev; 79 struct airoha_gpio_ctrl *ctrl; 80 int err; 81 82 ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL); 83 if (!ctrl) 84 return -ENOMEM; 85 86 ctrl->data = devm_platform_ioremap_resource(pdev, 0); 87 if (IS_ERR(ctrl->data)) 88 return PTR_ERR(ctrl->data); 89 90 ctrl->dir[0] = devm_platform_ioremap_resource(pdev, 1); 91 if (IS_ERR(ctrl->dir[0])) 92 return PTR_ERR(ctrl->dir[0]); 93 94 ctrl->dir[1] = devm_platform_ioremap_resource(pdev, 2); 95 if (IS_ERR(ctrl->dir[1])) 96 return PTR_ERR(ctrl->dir[1]); 97 98 ctrl->output = devm_platform_ioremap_resource(pdev, 3); 99 if (IS_ERR(ctrl->output)) 100 return PTR_ERR(ctrl->output); 101 102 config.dev = dev; 103 config.sz = 4; 104 config.dat = ctrl->data; 105 106 err = gpio_generic_chip_init(&ctrl->gen_gc, &config); 107 if (err) 108 return dev_err_probe(dev, err, "unable to init generic GPIO"); 109 110 ctrl->gen_gc.gc.ngpio = AIROHA_GPIO_MAX; 111 ctrl->gen_gc.gc.owner = THIS_MODULE; 112 ctrl->gen_gc.gc.direction_output = airoha_dir_out; 113 ctrl->gen_gc.gc.direction_input = airoha_dir_in; 114 ctrl->gen_gc.gc.get_direction = airoha_get_dir; 115 116 return devm_gpiochip_add_data(dev, &ctrl->gen_gc.gc, ctrl); 117 } 118 119 static const struct of_device_id airoha_gpio_of_match[] = { 120 { .compatible = "airoha,en7523-gpio" }, 121 { } 122 }; 123 MODULE_DEVICE_TABLE(of, airoha_gpio_of_match); 124 125 static struct platform_driver airoha_gpio_driver = { 126 .driver = { 127 .name = "airoha-gpio", 128 .of_match_table = airoha_gpio_of_match, 129 }, 130 .probe = airoha_gpio_probe, 131 }; 132 module_platform_driver(airoha_gpio_driver); 133 134 MODULE_DESCRIPTION("Airoha GPIO support"); 135 MODULE_AUTHOR("John Crispin <john@phrozen.org>"); 136 MODULE_LICENSE("GPL v2"); 137