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/mod_devicetable.h> 14 #include <linux/module.h> 15 #include <linux/err.h> 16 #include <linux/errno.h> 17 #include <linux/ioport.h> 18 #include <linux/gpio/driver.h> 19 #include <linux/platform_device.h> 20 #include <linux/spinlock.h> 21 #include <linux/slab.h> 22 23 #include "gpiolib-acpi.h" 24 25 /* 26 * Only first 8bits of a register correspond to each pin, 27 * so there are 4 registers for 32 pins. 28 */ 29 #define PDR(x) (0x0 + x / 8 * 4) 30 #define DDR(x) (0x10 + x / 8 * 4) 31 #define PFR(x) (0x20 + x / 8 * 4) 32 33 #define OFFSET(x) BIT((x) % 8) 34 35 struct mb86s70_gpio_chip { 36 struct gpio_chip gc; 37 void __iomem *base; 38 struct clk *clk; 39 spinlock_t lock; 40 }; 41 42 static int mb86s70_gpio_request(struct gpio_chip *gc, unsigned gpio) 43 { 44 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 45 unsigned long flags; 46 u32 val; 47 48 spin_lock_irqsave(&gchip->lock, flags); 49 50 val = readl(gchip->base + PFR(gpio)); 51 val &= ~OFFSET(gpio); 52 writel(val, gchip->base + PFR(gpio)); 53 54 spin_unlock_irqrestore(&gchip->lock, flags); 55 56 return 0; 57 } 58 59 static void mb86s70_gpio_free(struct gpio_chip *gc, unsigned gpio) 60 { 61 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 62 unsigned long flags; 63 u32 val; 64 65 spin_lock_irqsave(&gchip->lock, flags); 66 67 val = readl(gchip->base + PFR(gpio)); 68 val |= OFFSET(gpio); 69 writel(val, gchip->base + PFR(gpio)); 70 71 spin_unlock_irqrestore(&gchip->lock, flags); 72 } 73 74 static int mb86s70_gpio_direction_input(struct gpio_chip *gc, unsigned gpio) 75 { 76 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 77 unsigned long flags; 78 unsigned char val; 79 80 spin_lock_irqsave(&gchip->lock, flags); 81 82 val = readl(gchip->base + DDR(gpio)); 83 val &= ~OFFSET(gpio); 84 writel(val, gchip->base + DDR(gpio)); 85 86 spin_unlock_irqrestore(&gchip->lock, flags); 87 88 return 0; 89 } 90 91 static int mb86s70_gpio_direction_output(struct gpio_chip *gc, 92 unsigned gpio, int value) 93 { 94 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 95 unsigned long flags; 96 unsigned char val; 97 98 spin_lock_irqsave(&gchip->lock, flags); 99 100 val = readl(gchip->base + PDR(gpio)); 101 if (value) 102 val |= OFFSET(gpio); 103 else 104 val &= ~OFFSET(gpio); 105 writel(val, gchip->base + PDR(gpio)); 106 107 val = readl(gchip->base + DDR(gpio)); 108 val |= OFFSET(gpio); 109 writel(val, gchip->base + DDR(gpio)); 110 111 spin_unlock_irqrestore(&gchip->lock, flags); 112 113 return 0; 114 } 115 116 static int mb86s70_gpio_get(struct gpio_chip *gc, unsigned gpio) 117 { 118 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 119 120 return !!(readl(gchip->base + PDR(gpio)) & OFFSET(gpio)); 121 } 122 123 static void mb86s70_gpio_set(struct gpio_chip *gc, unsigned gpio, int value) 124 { 125 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); 126 unsigned long flags; 127 unsigned char val; 128 129 spin_lock_irqsave(&gchip->lock, flags); 130 131 val = readl(gchip->base + PDR(gpio)); 132 if (value) 133 val |= OFFSET(gpio); 134 else 135 val &= ~OFFSET(gpio); 136 writel(val, gchip->base + PDR(gpio)); 137 138 spin_unlock_irqrestore(&gchip->lock, flags); 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 == 0) 150 break; 151 if (irq_get_irq_data(irq)->hwirq == offset) 152 return irq; 153 } 154 return -EINVAL; 155 } 156 157 static int mb86s70_gpio_probe(struct platform_device *pdev) 158 { 159 struct mb86s70_gpio_chip *gchip; 160 int ret; 161 162 gchip = devm_kzalloc(&pdev->dev, sizeof(*gchip), GFP_KERNEL); 163 if (gchip == NULL) 164 return -ENOMEM; 165 166 platform_set_drvdata(pdev, gchip); 167 168 gchip->base = devm_platform_ioremap_resource(pdev, 0); 169 if (IS_ERR(gchip->base)) 170 return PTR_ERR(gchip->base); 171 172 gchip->clk = devm_clk_get_optional(&pdev->dev, NULL); 173 if (IS_ERR(gchip->clk)) 174 return PTR_ERR(gchip->clk); 175 176 ret = clk_prepare_enable(gchip->clk); 177 if (ret) 178 return ret; 179 180 spin_lock_init(&gchip->lock); 181 182 gchip->gc.direction_output = mb86s70_gpio_direction_output; 183 gchip->gc.direction_input = mb86s70_gpio_direction_input; 184 gchip->gc.request = mb86s70_gpio_request; 185 gchip->gc.free = mb86s70_gpio_free; 186 gchip->gc.get = mb86s70_gpio_get; 187 gchip->gc.set = mb86s70_gpio_set; 188 gchip->gc.to_irq = mb86s70_gpio_to_irq; 189 gchip->gc.label = dev_name(&pdev->dev); 190 gchip->gc.ngpio = 32; 191 gchip->gc.owner = THIS_MODULE; 192 gchip->gc.parent = &pdev->dev; 193 gchip->gc.base = -1; 194 195 ret = gpiochip_add_data(&gchip->gc, gchip); 196 if (ret) { 197 dev_err(&pdev->dev, "couldn't register gpio driver\n"); 198 clk_disable_unprepare(gchip->clk); 199 return ret; 200 } 201 202 acpi_gpiochip_request_interrupts(&gchip->gc); 203 204 return 0; 205 } 206 207 static void mb86s70_gpio_remove(struct platform_device *pdev) 208 { 209 struct mb86s70_gpio_chip *gchip = platform_get_drvdata(pdev); 210 211 acpi_gpiochip_free_interrupts(&gchip->gc); 212 gpiochip_remove(&gchip->gc); 213 clk_disable_unprepare(gchip->clk); 214 } 215 216 static const struct of_device_id mb86s70_gpio_dt_ids[] = { 217 { .compatible = "fujitsu,mb86s70-gpio" }, 218 { /* sentinel */ } 219 }; 220 MODULE_DEVICE_TABLE(of, mb86s70_gpio_dt_ids); 221 222 #ifdef CONFIG_ACPI 223 static const struct acpi_device_id mb86s70_gpio_acpi_ids[] = { 224 { "SCX0007" }, 225 { /* sentinel */ } 226 }; 227 MODULE_DEVICE_TABLE(acpi, mb86s70_gpio_acpi_ids); 228 #endif 229 230 static struct platform_driver mb86s70_gpio_driver = { 231 .driver = { 232 .name = "mb86s70-gpio", 233 .of_match_table = mb86s70_gpio_dt_ids, 234 .acpi_match_table = ACPI_PTR(mb86s70_gpio_acpi_ids), 235 }, 236 .probe = mb86s70_gpio_probe, 237 .remove_new = mb86s70_gpio_remove, 238 }; 239 module_platform_driver(mb86s70_gpio_driver); 240 241 MODULE_DESCRIPTION("MB86S7x GPIO Driver"); 242 MODULE_ALIAS("platform:mb86s70-gpio"); 243 MODULE_LICENSE("GPL"); 244