1 /* 2 * Qualcomm GPIO driver 3 * 4 * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <dm.h> 11 #include <errno.h> 12 #include <asm/gpio.h> 13 #include <asm/io.h> 14 15 DECLARE_GLOBAL_DATA_PTR; 16 17 /* Register offsets */ 18 #define GPIO_CONFIG_OFF(no) ((no) * 0x1000) 19 #define GPIO_IN_OUT_OFF(no) ((no) * 0x1000 + 0x4) 20 21 /* OE */ 22 #define GPIO_OE_DISABLE (0x0 << 9) 23 #define GPIO_OE_ENABLE (0x1 << 9) 24 #define GPIO_OE_MASK (0x1 << 9) 25 26 /* GPIO_IN_OUT register shifts. */ 27 #define GPIO_IN 0 28 #define GPIO_OUT 1 29 30 struct msm_gpio_bank { 31 phys_addr_t base; 32 }; 33 34 static int msm_gpio_direction_input(struct udevice *dev, unsigned int gpio) 35 { 36 struct msm_gpio_bank *priv = dev_get_priv(dev); 37 phys_addr_t reg = priv->base + GPIO_CONFIG_OFF(gpio); 38 39 /* Disable OE bit */ 40 clrsetbits_le32(reg, GPIO_OE_MASK, GPIO_OE_DISABLE); 41 42 return 0; 43 } 44 45 static int msm_gpio_set_value(struct udevice *dev, unsigned gpio, int value) 46 { 47 struct msm_gpio_bank *priv = dev_get_priv(dev); 48 49 value = !!value; 50 /* set value */ 51 writel(value << GPIO_OUT, priv->base + GPIO_IN_OUT_OFF(gpio)); 52 53 return 0; 54 } 55 56 static int msm_gpio_direction_output(struct udevice *dev, unsigned gpio, 57 int value) 58 { 59 struct msm_gpio_bank *priv = dev_get_priv(dev); 60 phys_addr_t reg = priv->base + GPIO_CONFIG_OFF(gpio); 61 62 value = !!value; 63 /* set value */ 64 writel(value << GPIO_OUT, priv->base + GPIO_IN_OUT_OFF(gpio)); 65 /* switch direction */ 66 clrsetbits_le32(reg, GPIO_OE_MASK, GPIO_OE_ENABLE); 67 68 return 0; 69 } 70 71 static int msm_gpio_get_value(struct udevice *dev, unsigned gpio) 72 { 73 struct msm_gpio_bank *priv = dev_get_priv(dev); 74 75 return !!(readl(priv->base + GPIO_IN_OUT_OFF(gpio)) >> GPIO_IN); 76 } 77 78 static int msm_gpio_get_function(struct udevice *dev, unsigned offset) 79 { 80 struct msm_gpio_bank *priv = dev_get_priv(dev); 81 82 if (readl(priv->base + GPIO_CONFIG_OFF(offset)) & GPIO_OE_ENABLE) 83 return GPIOF_OUTPUT; 84 85 return GPIOF_INPUT; 86 } 87 88 static const struct dm_gpio_ops gpio_msm_ops = { 89 .direction_input = msm_gpio_direction_input, 90 .direction_output = msm_gpio_direction_output, 91 .get_value = msm_gpio_get_value, 92 .set_value = msm_gpio_set_value, 93 .get_function = msm_gpio_get_function, 94 }; 95 96 static int msm_gpio_probe(struct udevice *dev) 97 { 98 struct msm_gpio_bank *priv = dev_get_priv(dev); 99 100 priv->base = devfdt_get_addr(dev); 101 102 return priv->base == FDT_ADDR_T_NONE ? -EINVAL : 0; 103 } 104 105 static int msm_gpio_ofdata_to_platdata(struct udevice *dev) 106 { 107 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); 108 109 uc_priv->gpio_count = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), 110 "gpio-count", 0); 111 uc_priv->bank_name = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), 112 "gpio-bank-name", NULL); 113 if (uc_priv->bank_name == NULL) 114 uc_priv->bank_name = "soc"; 115 116 return 0; 117 } 118 119 static const struct udevice_id msm_gpio_ids[] = { 120 { .compatible = "qcom,msm8916-pinctrl" }, 121 { .compatible = "qcom,apq8016-pinctrl" }, 122 { } 123 }; 124 125 U_BOOT_DRIVER(gpio_msm) = { 126 .name = "gpio_msm", 127 .id = UCLASS_GPIO, 128 .of_match = msm_gpio_ids, 129 .ofdata_to_platdata = msm_gpio_ofdata_to_platdata, 130 .probe = msm_gpio_probe, 131 .ops = &gpio_msm_ops, 132 .priv_auto_alloc_size = sizeof(struct msm_gpio_bank), 133 }; 134