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/mod_devicetable.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 * @gc: Associated gpio_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_chip gc; 24 void __iomem *data; 25 void __iomem *dir[2]; 26 void __iomem *output; 27 }; 28 29 static struct airoha_gpio_ctrl *gc_to_ctrl(struct gpio_chip *gc) 30 { 31 return container_of(gc, struct airoha_gpio_ctrl, gc); 32 } 33 34 static int airoha_dir_set(struct gpio_chip *gc, unsigned int gpio, 35 int val, int out) 36 { 37 struct airoha_gpio_ctrl *ctrl = gc_to_ctrl(gc); 38 u32 dir = ioread32(ctrl->dir[gpio / 16]); 39 u32 output = ioread32(ctrl->output); 40 u32 mask = BIT((gpio % 16) * 2); 41 42 if (out) { 43 dir |= mask; 44 output |= BIT(gpio); 45 } else { 46 dir &= ~mask; 47 output &= ~BIT(gpio); 48 } 49 50 iowrite32(dir, ctrl->dir[gpio / 16]); 51 52 if (out) 53 gc->set(gc, gpio, val); 54 55 iowrite32(output, ctrl->output); 56 57 return 0; 58 } 59 60 static int airoha_dir_out(struct gpio_chip *gc, unsigned int gpio, 61 int val) 62 { 63 return airoha_dir_set(gc, gpio, val, 1); 64 } 65 66 static int airoha_dir_in(struct gpio_chip *gc, unsigned int gpio) 67 { 68 return airoha_dir_set(gc, gpio, 0, 0); 69 } 70 71 static int airoha_get_dir(struct gpio_chip *gc, unsigned int gpio) 72 { 73 struct airoha_gpio_ctrl *ctrl = gc_to_ctrl(gc); 74 u32 dir = ioread32(ctrl->dir[gpio / 16]); 75 u32 mask = BIT((gpio % 16) * 2); 76 77 return (dir & mask) ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN; 78 } 79 80 static int airoha_gpio_probe(struct platform_device *pdev) 81 { 82 struct device *dev = &pdev->dev; 83 struct airoha_gpio_ctrl *ctrl; 84 int err; 85 86 ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL); 87 if (!ctrl) 88 return -ENOMEM; 89 90 ctrl->data = devm_platform_ioremap_resource(pdev, 0); 91 if (IS_ERR(ctrl->data)) 92 return PTR_ERR(ctrl->data); 93 94 ctrl->dir[0] = devm_platform_ioremap_resource(pdev, 1); 95 if (IS_ERR(ctrl->dir[0])) 96 return PTR_ERR(ctrl->dir[0]); 97 98 ctrl->dir[1] = devm_platform_ioremap_resource(pdev, 2); 99 if (IS_ERR(ctrl->dir[1])) 100 return PTR_ERR(ctrl->dir[1]); 101 102 ctrl->output = devm_platform_ioremap_resource(pdev, 3); 103 if (IS_ERR(ctrl->output)) 104 return PTR_ERR(ctrl->output); 105 106 err = bgpio_init(&ctrl->gc, dev, 4, ctrl->data, NULL, 107 NULL, NULL, NULL, 0); 108 if (err) 109 return dev_err_probe(dev, err, "unable to init generic GPIO"); 110 111 ctrl->gc.ngpio = AIROHA_GPIO_MAX; 112 ctrl->gc.owner = THIS_MODULE; 113 ctrl->gc.direction_output = airoha_dir_out; 114 ctrl->gc.direction_input = airoha_dir_in; 115 ctrl->gc.get_direction = airoha_get_dir; 116 117 return devm_gpiochip_add_data(dev, &ctrl->gc, ctrl); 118 } 119 120 static const struct of_device_id airoha_gpio_of_match[] = { 121 { .compatible = "airoha,en7523-gpio" }, 122 { } 123 }; 124 MODULE_DEVICE_TABLE(of, airoha_gpio_of_match); 125 126 static struct platform_driver airoha_gpio_driver = { 127 .driver = { 128 .name = "airoha-gpio", 129 .of_match_table = airoha_gpio_of_match, 130 }, 131 .probe = airoha_gpio_probe, 132 }; 133 module_platform_driver(airoha_gpio_driver); 134 135 MODULE_DESCRIPTION("Airoha GPIO support"); 136 MODULE_AUTHOR("John Crispin <john@phrozen.org>"); 137 MODULE_LICENSE("GPL v2"); 138