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/of_device.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.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 break; 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 int ret; 159 160 gchip = devm_kzalloc(&pdev->dev, sizeof(*gchip), GFP_KERNEL); 161 if (gchip == NULL) 162 return -ENOMEM; 163 164 platform_set_drvdata(pdev, gchip); 165 166 gchip->base = devm_platform_ioremap_resource(pdev, 0); 167 if (IS_ERR(gchip->base)) 168 return PTR_ERR(gchip->base); 169 170 if (!has_acpi_companion(&pdev->dev)) { 171 gchip->clk = devm_clk_get(&pdev->dev, NULL); 172 if (IS_ERR(gchip->clk)) 173 return PTR_ERR(gchip->clk); 174 175 ret = clk_prepare_enable(gchip->clk); 176 if (ret) 177 return ret; 178 } 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.label = dev_name(&pdev->dev); 189 gchip->gc.ngpio = 32; 190 gchip->gc.owner = THIS_MODULE; 191 gchip->gc.parent = &pdev->dev; 192 gchip->gc.base = -1; 193 194 if (has_acpi_companion(&pdev->dev)) 195 gchip->gc.to_irq = mb86s70_gpio_to_irq; 196 197 ret = gpiochip_add_data(&gchip->gc, gchip); 198 if (ret) { 199 dev_err(&pdev->dev, "couldn't register gpio driver\n"); 200 clk_disable_unprepare(gchip->clk); 201 return ret; 202 } 203 204 if (has_acpi_companion(&pdev->dev)) 205 acpi_gpiochip_request_interrupts(&gchip->gc); 206 207 return 0; 208 } 209 210 static int mb86s70_gpio_remove(struct platform_device *pdev) 211 { 212 struct mb86s70_gpio_chip *gchip = platform_get_drvdata(pdev); 213 214 if (has_acpi_companion(&pdev->dev)) 215 acpi_gpiochip_free_interrupts(&gchip->gc); 216 gpiochip_remove(&gchip->gc); 217 clk_disable_unprepare(gchip->clk); 218 219 return 0; 220 } 221 222 static const struct of_device_id mb86s70_gpio_dt_ids[] = { 223 { .compatible = "fujitsu,mb86s70-gpio" }, 224 { /* sentinel */ } 225 }; 226 MODULE_DEVICE_TABLE(of, mb86s70_gpio_dt_ids); 227 228 #ifdef CONFIG_ACPI 229 static const struct acpi_device_id mb86s70_gpio_acpi_ids[] = { 230 { "SCX0007" }, 231 { /* sentinel */ } 232 }; 233 MODULE_DEVICE_TABLE(acpi, mb86s70_gpio_acpi_ids); 234 #endif 235 236 static struct platform_driver mb86s70_gpio_driver = { 237 .driver = { 238 .name = "mb86s70-gpio", 239 .of_match_table = mb86s70_gpio_dt_ids, 240 .acpi_match_table = ACPI_PTR(mb86s70_gpio_acpi_ids), 241 }, 242 .probe = mb86s70_gpio_probe, 243 .remove = mb86s70_gpio_remove, 244 }; 245 module_platform_driver(mb86s70_gpio_driver); 246 247 MODULE_DESCRIPTION("MB86S7x GPIO Driver"); 248 MODULE_ALIAS("platform:mb86s70-gpio"); 249 MODULE_LICENSE("GPL"); 250