1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/gpio/gpio-mb86s7x.c 4 * 5 * Copyright (C) 2015 Fujitsu Semiconductor Limited 6 * Copyright (C) 2015 Linaro Ltd. 7 */ 8 9 #include <linux/acpi.h> 10 #include <linux/io.h> 11 #include <linux/init.h> 12 #include <linux/clk.h> 13 #include <linux/module.h> 14 #include <linux/err.h> 15 #include <linux/errno.h> 16 #include <linux/ioport.h> 17 #include <linux/gpio/driver.h> 18 #include <linux/platform_device.h> 19 #include <linux/spinlock.h> 20 #include <linux/slab.h> 21 22 #include "gpiolib-acpi.h" 23 24 /* 25 * Only first 8bits of a register correspond to each pin, 26 * so there are 4 registers for 32 pins. 27 */ 28 #define PDR(x) (0x0 + x / 8 * 4) 29 #define DDR(x) (0x10 + x / 8 * 4) 30 #define PFR(x) (0x20 + x / 8 * 4) 31 32 #define OFFSET(x) BIT((x) % 8) 33 34 struct mb86s70_gpio_chip { 35 struct gpio_chip gc; 36 void __iomem *base; 37 spinlock_t lock; 38 }; 39 40 static int mb86s70_gpio_request(struct gpio_chip *gc, unsigned gpio) 41 { 42 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 43 unsigned long flags; 44 u32 val; 45 46 spin_lock_irqsave(&gchip->lock, flags); 47 48 val = readl(gchip->base + PFR(gpio)); 49 val &= ~OFFSET(gpio); 50 writel(val, gchip->base + PFR(gpio)); 51 52 spin_unlock_irqrestore(&gchip->lock, flags); 53 54 return 0; 55 } 56 57 static void mb86s70_gpio_free(struct gpio_chip *gc, unsigned gpio) 58 { 59 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 60 unsigned long flags; 61 u32 val; 62 63 spin_lock_irqsave(&gchip->lock, flags); 64 65 val = readl(gchip->base + PFR(gpio)); 66 val |= OFFSET(gpio); 67 writel(val, gchip->base + PFR(gpio)); 68 69 spin_unlock_irqrestore(&gchip->lock, flags); 70 } 71 72 static int mb86s70_gpio_direction_input(struct gpio_chip *gc, unsigned gpio) 73 { 74 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 75 unsigned long flags; 76 unsigned char val; 77 78 spin_lock_irqsave(&gchip->lock, flags); 79 80 val = readl(gchip->base + DDR(gpio)); 81 val &= ~OFFSET(gpio); 82 writel(val, gchip->base + DDR(gpio)); 83 84 spin_unlock_irqrestore(&gchip->lock, flags); 85 86 return 0; 87 } 88 89 static int mb86s70_gpio_direction_output(struct gpio_chip *gc, 90 unsigned gpio, int value) 91 { 92 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 93 unsigned long flags; 94 unsigned char val; 95 96 spin_lock_irqsave(&gchip->lock, flags); 97 98 val = readl(gchip->base + PDR(gpio)); 99 if (value) 100 val |= OFFSET(gpio); 101 else 102 val &= ~OFFSET(gpio); 103 writel(val, gchip->base + PDR(gpio)); 104 105 val = readl(gchip->base + DDR(gpio)); 106 val |= OFFSET(gpio); 107 writel(val, gchip->base + DDR(gpio)); 108 109 spin_unlock_irqrestore(&gchip->lock, flags); 110 111 return 0; 112 } 113 114 static int mb86s70_gpio_get(struct gpio_chip *gc, unsigned gpio) 115 { 116 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 117 118 return !!(readl(gchip->base + PDR(gpio)) & OFFSET(gpio)); 119 } 120 121 static int mb86s70_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 122 { 123 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 124 unsigned long flags; 125 unsigned char val; 126 127 spin_lock_irqsave(&gchip->lock, flags); 128 129 val = readl(gchip->base + PDR(gpio)); 130 if (value) 131 val |= OFFSET(gpio); 132 else 133 val &= ~OFFSET(gpio); 134 writel(val, gchip->base + PDR(gpio)); 135 136 spin_unlock_irqrestore(&gchip->lock, flags); 137 138 return 0; 139 } 140 141 static int mb86s70_gpio_to_irq(struct gpio_chip *gc, unsigned int offset) 142 { 143 int irq, index; 144 145 for (index = 0;; index++) { 146 irq = platform_get_irq(to_platform_device(gc->parent), index); 147 if (irq < 0) 148 return irq; 149 if (irq_get_irq_data(irq)->hwirq == offset) 150 return irq; 151 } 152 return -EINVAL; 153 } 154 155 static int mb86s70_gpio_probe(struct platform_device *pdev) 156 { 157 struct mb86s70_gpio_chip *gchip; 158 struct clk *clk; 159 int ret; 160 161 gchip = devm_kzalloc(&pdev->dev, sizeof(*gchip), GFP_KERNEL); 162 if (gchip == NULL) 163 return -ENOMEM; 164 165 platform_set_drvdata(pdev, gchip); 166 167 gchip->base = devm_platform_ioremap_resource(pdev, 0); 168 if (IS_ERR(gchip->base)) 169 return PTR_ERR(gchip->base); 170 171 clk = devm_clk_get_optional_enabled(&pdev->dev, NULL); 172 if (IS_ERR(clk)) 173 return PTR_ERR(clk); 174 175 spin_lock_init(&gchip->lock); 176 177 gchip->gc.direction_output = mb86s70_gpio_direction_output; 178 gchip->gc.direction_input = mb86s70_gpio_direction_input; 179 gchip->gc.request = mb86s70_gpio_request; 180 gchip->gc.free = mb86s70_gpio_free; 181 gchip->gc.get = mb86s70_gpio_get; 182 gchip->gc.set = mb86s70_gpio_set; 183 gchip->gc.to_irq = mb86s70_gpio_to_irq; 184 gchip->gc.label = dev_name(&pdev->dev); 185 gchip->gc.ngpio = 32; 186 gchip->gc.owner = THIS_MODULE; 187 gchip->gc.parent = &pdev->dev; 188 gchip->gc.base = -1; 189 190 ret = gpiochip_add_data(&gchip->gc, gchip); 191 if (ret) 192 return dev_err_probe(&pdev->dev, ret, 193 "couldn't register gpio driver\n"); 194 195 acpi_gpiochip_request_interrupts(&gchip->gc); 196 197 return 0; 198 } 199 200 static void mb86s70_gpio_remove(struct platform_device *pdev) 201 { 202 struct mb86s70_gpio_chip *gchip = platform_get_drvdata(pdev); 203 204 acpi_gpiochip_free_interrupts(&gchip->gc); 205 gpiochip_remove(&gchip->gc); 206 } 207 208 static const struct of_device_id mb86s70_gpio_dt_ids[] = { 209 { .compatible = "fujitsu,mb86s70-gpio" }, 210 { /* sentinel */ } 211 }; 212 MODULE_DEVICE_TABLE(of, mb86s70_gpio_dt_ids); 213 214 #ifdef CONFIG_ACPI 215 static const struct acpi_device_id mb86s70_gpio_acpi_ids[] = { 216 { "SCX0007" }, 217 { /* sentinel */ } 218 }; 219 MODULE_DEVICE_TABLE(acpi, mb86s70_gpio_acpi_ids); 220 #endif 221 222 static struct platform_driver mb86s70_gpio_driver = { 223 .driver = { 224 .name = "mb86s70-gpio", 225 .of_match_table = mb86s70_gpio_dt_ids, 226 .acpi_match_table = ACPI_PTR(mb86s70_gpio_acpi_ids), 227 }, 228 .probe = mb86s70_gpio_probe, 229 .remove = mb86s70_gpio_remove, 230 }; 231 module_platform_driver(mb86s70_gpio_driver); 232 233 MODULE_DESCRIPTION("MB86S7x GPIO Driver"); 234 MODULE_ALIAS("platform:mb86s70-gpio"); 235 MODULE_LICENSE("GPL"); 236