1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2018 Spreadtrum Communications Inc. 4 * Copyright (C) 2018 Linaro Ltd. 5 */ 6 7 #include <linux/bitops.h> 8 #include <linux/gpio/driver.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/of_device.h> 12 #include <linux/platform_device.h> 13 #include <linux/spinlock.h> 14 15 /* GPIO registers definition */ 16 #define SPRD_GPIO_DATA 0x0 17 #define SPRD_GPIO_DMSK 0x4 18 #define SPRD_GPIO_DIR 0x8 19 #define SPRD_GPIO_IS 0xc 20 #define SPRD_GPIO_IBE 0x10 21 #define SPRD_GPIO_IEV 0x14 22 #define SPRD_GPIO_IE 0x18 23 #define SPRD_GPIO_RIS 0x1c 24 #define SPRD_GPIO_MIS 0x20 25 #define SPRD_GPIO_IC 0x24 26 #define SPRD_GPIO_INEN 0x28 27 28 /* We have 16 banks GPIOs and each bank contain 16 GPIOs */ 29 #define SPRD_GPIO_BANK_NR 16 30 #define SPRD_GPIO_NR 256 31 #define SPRD_GPIO_BANK_SIZE 0x80 32 #define SPRD_GPIO_BANK_MASK GENMASK(15, 0) 33 #define SPRD_GPIO_BIT(x) ((x) & (SPRD_GPIO_BANK_NR - 1)) 34 35 struct sprd_gpio { 36 struct gpio_chip chip; 37 void __iomem *base; 38 spinlock_t lock; 39 int irq; 40 }; 41 42 static inline void __iomem *sprd_gpio_bank_base(struct sprd_gpio *sprd_gpio, 43 unsigned int bank) 44 { 45 return sprd_gpio->base + SPRD_GPIO_BANK_SIZE * bank; 46 } 47 48 static void sprd_gpio_update(struct gpio_chip *chip, unsigned int offset, 49 u16 reg, int val) 50 { 51 struct sprd_gpio *sprd_gpio = gpiochip_get_data(chip); 52 void __iomem *base = sprd_gpio_bank_base(sprd_gpio, 53 offset / SPRD_GPIO_BANK_NR); 54 unsigned long flags; 55 u32 tmp; 56 57 spin_lock_irqsave(&sprd_gpio->lock, flags); 58 tmp = readl_relaxed(base + reg); 59 60 if (val) 61 tmp |= BIT(SPRD_GPIO_BIT(offset)); 62 else 63 tmp &= ~BIT(SPRD_GPIO_BIT(offset)); 64 65 writel_relaxed(tmp, base + reg); 66 spin_unlock_irqrestore(&sprd_gpio->lock, flags); 67 } 68 69 static int sprd_gpio_read(struct gpio_chip *chip, unsigned int offset, u16 reg) 70 { 71 struct sprd_gpio *sprd_gpio = gpiochip_get_data(chip); 72 void __iomem *base = sprd_gpio_bank_base(sprd_gpio, 73 offset / SPRD_GPIO_BANK_NR); 74 75 return !!(readl_relaxed(base + reg) & BIT(SPRD_GPIO_BIT(offset))); 76 } 77 78 static int sprd_gpio_request(struct gpio_chip *chip, unsigned int offset) 79 { 80 sprd_gpio_update(chip, offset, SPRD_GPIO_DMSK, 1); 81 return 0; 82 } 83 84 static void sprd_gpio_free(struct gpio_chip *chip, unsigned int offset) 85 { 86 sprd_gpio_update(chip, offset, SPRD_GPIO_DMSK, 0); 87 } 88 89 static int sprd_gpio_direction_input(struct gpio_chip *chip, 90 unsigned int offset) 91 { 92 sprd_gpio_update(chip, offset, SPRD_GPIO_DIR, 0); 93 sprd_gpio_update(chip, offset, SPRD_GPIO_INEN, 1); 94 return 0; 95 } 96 97 static int sprd_gpio_direction_output(struct gpio_chip *chip, 98 unsigned int offset, int value) 99 { 100 sprd_gpio_update(chip, offset, SPRD_GPIO_DIR, 1); 101 sprd_gpio_update(chip, offset, SPRD_GPIO_INEN, 0); 102 sprd_gpio_update(chip, offset, SPRD_GPIO_DATA, value); 103 return 0; 104 } 105 106 static int sprd_gpio_get(struct gpio_chip *chip, unsigned int offset) 107 { 108 return sprd_gpio_read(chip, offset, SPRD_GPIO_DATA); 109 } 110 111 static void sprd_gpio_set(struct gpio_chip *chip, unsigned int offset, 112 int value) 113 { 114 sprd_gpio_update(chip, offset, SPRD_GPIO_DATA, value); 115 } 116 117 static void sprd_gpio_irq_mask(struct irq_data *data) 118 { 119 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 120 u32 offset = irqd_to_hwirq(data); 121 122 sprd_gpio_update(chip, offset, SPRD_GPIO_IE, 0); 123 } 124 125 static void sprd_gpio_irq_ack(struct irq_data *data) 126 { 127 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 128 u32 offset = irqd_to_hwirq(data); 129 130 sprd_gpio_update(chip, offset, SPRD_GPIO_IC, 1); 131 } 132 133 static void sprd_gpio_irq_unmask(struct irq_data *data) 134 { 135 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 136 u32 offset = irqd_to_hwirq(data); 137 138 sprd_gpio_update(chip, offset, SPRD_GPIO_IE, 1); 139 } 140 141 static int sprd_gpio_irq_set_type(struct irq_data *data, 142 unsigned int flow_type) 143 { 144 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 145 u32 offset = irqd_to_hwirq(data); 146 147 switch (flow_type) { 148 case IRQ_TYPE_EDGE_RISING: 149 sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0); 150 sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0); 151 sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 1); 152 irq_set_handler_locked(data, handle_edge_irq); 153 break; 154 case IRQ_TYPE_EDGE_FALLING: 155 sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0); 156 sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0); 157 sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 0); 158 irq_set_handler_locked(data, handle_edge_irq); 159 break; 160 case IRQ_TYPE_EDGE_BOTH: 161 sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0); 162 sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 1); 163 irq_set_handler_locked(data, handle_edge_irq); 164 break; 165 case IRQ_TYPE_LEVEL_HIGH: 166 sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 1); 167 sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0); 168 sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 1); 169 irq_set_handler_locked(data, handle_level_irq); 170 break; 171 case IRQ_TYPE_LEVEL_LOW: 172 sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 1); 173 sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0); 174 sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 0); 175 irq_set_handler_locked(data, handle_level_irq); 176 break; 177 default: 178 return -EINVAL; 179 } 180 181 return 0; 182 } 183 184 static void sprd_gpio_irq_handler(struct irq_desc *desc) 185 { 186 struct gpio_chip *chip = irq_desc_get_handler_data(desc); 187 struct irq_chip *ic = irq_desc_get_chip(desc); 188 struct sprd_gpio *sprd_gpio = gpiochip_get_data(chip); 189 u32 bank, n, girq; 190 191 chained_irq_enter(ic, desc); 192 193 for (bank = 0; bank * SPRD_GPIO_BANK_NR < chip->ngpio; bank++) { 194 void __iomem *base = sprd_gpio_bank_base(sprd_gpio, bank); 195 unsigned long reg = readl_relaxed(base + SPRD_GPIO_MIS) & 196 SPRD_GPIO_BANK_MASK; 197 198 for_each_set_bit(n, ®, SPRD_GPIO_BANK_NR) { 199 girq = irq_find_mapping(chip->irq.domain, 200 bank * SPRD_GPIO_BANK_NR + n); 201 202 generic_handle_irq(girq); 203 } 204 205 } 206 chained_irq_exit(ic, desc); 207 } 208 209 static struct irq_chip sprd_gpio_irqchip = { 210 .name = "sprd-gpio", 211 .irq_ack = sprd_gpio_irq_ack, 212 .irq_mask = sprd_gpio_irq_mask, 213 .irq_unmask = sprd_gpio_irq_unmask, 214 .irq_set_type = sprd_gpio_irq_set_type, 215 .flags = IRQCHIP_SKIP_SET_WAKE, 216 }; 217 218 static int sprd_gpio_probe(struct platform_device *pdev) 219 { 220 struct gpio_irq_chip *irq; 221 struct sprd_gpio *sprd_gpio; 222 int ret; 223 224 sprd_gpio = devm_kzalloc(&pdev->dev, sizeof(*sprd_gpio), GFP_KERNEL); 225 if (!sprd_gpio) 226 return -ENOMEM; 227 228 sprd_gpio->irq = platform_get_irq(pdev, 0); 229 if (sprd_gpio->irq < 0) { 230 dev_err(&pdev->dev, "Failed to get GPIO interrupt.\n"); 231 return sprd_gpio->irq; 232 } 233 234 sprd_gpio->base = devm_platform_ioremap_resource(pdev, 0); 235 if (IS_ERR(sprd_gpio->base)) 236 return PTR_ERR(sprd_gpio->base); 237 238 spin_lock_init(&sprd_gpio->lock); 239 240 sprd_gpio->chip.label = dev_name(&pdev->dev); 241 sprd_gpio->chip.ngpio = SPRD_GPIO_NR; 242 sprd_gpio->chip.base = -1; 243 sprd_gpio->chip.parent = &pdev->dev; 244 sprd_gpio->chip.of_node = pdev->dev.of_node; 245 sprd_gpio->chip.request = sprd_gpio_request; 246 sprd_gpio->chip.free = sprd_gpio_free; 247 sprd_gpio->chip.get = sprd_gpio_get; 248 sprd_gpio->chip.set = sprd_gpio_set; 249 sprd_gpio->chip.direction_input = sprd_gpio_direction_input; 250 sprd_gpio->chip.direction_output = sprd_gpio_direction_output; 251 252 irq = &sprd_gpio->chip.irq; 253 irq->chip = &sprd_gpio_irqchip; 254 irq->handler = handle_bad_irq; 255 irq->default_type = IRQ_TYPE_NONE; 256 irq->parent_handler = sprd_gpio_irq_handler; 257 irq->parent_handler_data = sprd_gpio; 258 irq->num_parents = 1; 259 irq->parents = &sprd_gpio->irq; 260 261 ret = devm_gpiochip_add_data(&pdev->dev, &sprd_gpio->chip, sprd_gpio); 262 if (ret < 0) { 263 dev_err(&pdev->dev, "Could not register gpiochip %d\n", ret); 264 return ret; 265 } 266 267 platform_set_drvdata(pdev, sprd_gpio); 268 return 0; 269 } 270 271 static const struct of_device_id sprd_gpio_of_match[] = { 272 { .compatible = "sprd,sc9860-gpio", }, 273 { /* end of list */ } 274 }; 275 MODULE_DEVICE_TABLE(of, sprd_gpio_of_match); 276 277 static struct platform_driver sprd_gpio_driver = { 278 .probe = sprd_gpio_probe, 279 .driver = { 280 .name = "sprd-gpio", 281 .of_match_table = sprd_gpio_of_match, 282 }, 283 }; 284 285 module_platform_driver_probe(sprd_gpio_driver, sprd_gpio_probe); 286 287 MODULE_DESCRIPTION("Spreadtrum GPIO driver"); 288 MODULE_LICENSE("GPL v2"); 289