1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2015 Marek Vasut <marex (at) denx.de> 4 * 5 * DesignWare APB GPIO driver 6 */ 7 8 #include <common.h> 9 #include <malloc.h> 10 #include <asm/arch/gpio.h> 11 #include <asm/gpio.h> 12 #include <asm/io.h> 13 #include <dm.h> 14 #include <dm/device-internal.h> 15 #include <dm/lists.h> 16 #include <dm/root.h> 17 #include <errno.h> 18 19 DECLARE_GLOBAL_DATA_PTR; 20 21 #define GPIO_SWPORT_DR(p) (0x00 + (p) * 0xc) 22 #define GPIO_SWPORT_DDR(p) (0x04 + (p) * 0xc) 23 #define GPIO_INTEN 0x30 24 #define GPIO_INTMASK 0x34 25 #define GPIO_INTTYPE_LEVEL 0x38 26 #define GPIO_INT_POLARITY 0x3c 27 #define GPIO_INTSTATUS 0x40 28 #define GPIO_PORTA_DEBOUNCE 0x48 29 #define GPIO_PORTA_EOI 0x4c 30 #define GPIO_EXT_PORT(p) (0x50 + (p) * 4) 31 32 struct gpio_dwapb_platdata { 33 const char *name; 34 int bank; 35 int pins; 36 fdt_addr_t base; 37 }; 38 39 static int dwapb_gpio_direction_input(struct udevice *dev, unsigned pin) 40 { 41 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev); 42 43 clrbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin); 44 return 0; 45 } 46 47 static int dwapb_gpio_direction_output(struct udevice *dev, unsigned pin, 48 int val) 49 { 50 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev); 51 52 setbits_le32(plat->base + GPIO_SWPORT_DDR(plat->bank), 1 << pin); 53 54 if (val) 55 setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin); 56 else 57 clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin); 58 59 return 0; 60 } 61 62 static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin) 63 { 64 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev); 65 return !!(readl(plat->base + GPIO_EXT_PORT(plat->bank)) & (1 << pin)); 66 } 67 68 69 static int dwapb_gpio_set_value(struct udevice *dev, unsigned pin, int val) 70 { 71 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev); 72 73 if (val) 74 setbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin); 75 else 76 clrbits_le32(plat->base + GPIO_SWPORT_DR(plat->bank), 1 << pin); 77 78 return 0; 79 } 80 81 static const struct dm_gpio_ops gpio_dwapb_ops = { 82 .direction_input = dwapb_gpio_direction_input, 83 .direction_output = dwapb_gpio_direction_output, 84 .get_value = dwapb_gpio_get_value, 85 .set_value = dwapb_gpio_set_value, 86 }; 87 88 static int gpio_dwapb_probe(struct udevice *dev) 89 { 90 struct gpio_dev_priv *priv = dev_get_uclass_priv(dev); 91 struct gpio_dwapb_platdata *plat = dev->platdata; 92 93 if (!plat) 94 return 0; 95 96 priv->gpio_count = plat->pins; 97 priv->bank_name = plat->name; 98 99 return 0; 100 } 101 102 static int gpio_dwapb_bind(struct udevice *dev) 103 { 104 struct gpio_dwapb_platdata *plat = dev_get_platdata(dev); 105 const void *blob = gd->fdt_blob; 106 struct udevice *subdev; 107 fdt_addr_t base; 108 int ret, node, bank = 0; 109 110 /* If this is a child device, there is nothing to do here */ 111 if (plat) 112 return 0; 113 114 base = fdtdec_get_addr(blob, dev_of_offset(dev), "reg"); 115 if (base == FDT_ADDR_T_NONE) { 116 debug("Can't get the GPIO register base address\n"); 117 return -ENXIO; 118 } 119 120 for (node = fdt_first_subnode(blob, dev_of_offset(dev)); 121 node > 0; 122 node = fdt_next_subnode(blob, node)) { 123 if (!fdtdec_get_bool(blob, node, "gpio-controller")) 124 continue; 125 126 plat = NULL; 127 plat = calloc(1, sizeof(*plat)); 128 if (!plat) 129 return -ENOMEM; 130 131 plat->base = base; 132 plat->bank = bank; 133 plat->pins = fdtdec_get_int(blob, node, "snps,nr-gpios", 0); 134 plat->name = fdt_stringlist_get(blob, node, "bank-name", 0, 135 NULL); 136 if (ret) 137 goto err; 138 139 ret = device_bind(dev, dev->driver, plat->name, 140 plat, -1, &subdev); 141 if (ret) 142 goto err; 143 144 dev_set_of_offset(subdev, node); 145 bank++; 146 } 147 148 return 0; 149 150 err: 151 free(plat); 152 return ret; 153 } 154 155 static const struct udevice_id gpio_dwapb_ids[] = { 156 { .compatible = "snps,dw-apb-gpio" }, 157 { } 158 }; 159 160 U_BOOT_DRIVER(gpio_dwapb) = { 161 .name = "gpio-dwapb", 162 .id = UCLASS_GPIO, 163 .of_match = gpio_dwapb_ids, 164 .ops = &gpio_dwapb_ops, 165 .bind = gpio_dwapb_bind, 166 .probe = gpio_dwapb_probe, 167 }; 168
