1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015
4 * Bhuvanchandra DV, Toradex, Inc.
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <errno.h>
10 #include <fdtdec.h>
11 #include <asm/global_data.h>
12 #include <asm/gpio.h>
13 #include <asm/mach-imx/iomux-v3.h>
14 #include <asm/io.h>
15 #include <malloc.h>
16
17 DECLARE_GLOBAL_DATA_PTR;
18
19 struct vybrid_gpios {
20 unsigned int chip;
21 struct vybrid_gpio_regs *reg;
22 };
23
vybrid_gpio_direction_input(struct udevice * dev,unsigned gpio)24 static int vybrid_gpio_direction_input(struct udevice *dev, unsigned gpio)
25 {
26 const struct vybrid_gpios *gpios = dev_get_priv(dev);
27
28 gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
29 imx_iomux_gpio_set_direction(gpio, VF610_GPIO_DIRECTION_IN);
30
31 return 0;
32 }
33
vybrid_gpio_direction_output(struct udevice * dev,unsigned gpio,int value)34 static int vybrid_gpio_direction_output(struct udevice *dev, unsigned gpio,
35 int value)
36 {
37 const struct vybrid_gpios *gpios = dev_get_priv(dev);
38
39 gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
40 gpio_set_value(gpio, value);
41 imx_iomux_gpio_set_direction(gpio, VF610_GPIO_DIRECTION_OUT);
42
43 return 0;
44 }
45
vybrid_gpio_get_value(struct udevice * dev,unsigned gpio)46 static int vybrid_gpio_get_value(struct udevice *dev, unsigned gpio)
47 {
48 const struct vybrid_gpios *gpios = dev_get_priv(dev);
49
50 return ((readl(&gpios->reg->gpio_pdir) & (1 << gpio))) ? 1 : 0;
51 }
52
vybrid_gpio_set_value(struct udevice * dev,unsigned gpio,int value)53 static int vybrid_gpio_set_value(struct udevice *dev, unsigned gpio,
54 int value)
55 {
56 const struct vybrid_gpios *gpios = dev_get_priv(dev);
57 if (value)
58 writel((1 << gpio), &gpios->reg->gpio_psor);
59 else
60 writel((1 << gpio), &gpios->reg->gpio_pcor);
61
62 return 0;
63 }
64
vybrid_gpio_get_function(struct udevice * dev,unsigned gpio)65 static int vybrid_gpio_get_function(struct udevice *dev, unsigned gpio)
66 {
67 const struct vybrid_gpios *gpios = dev_get_priv(dev);
68 u32 g_state = 0;
69
70 gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
71
72 imx_iomux_gpio_get_function(gpio, &g_state);
73
74 if (((g_state & (0x07 << PAD_MUX_MODE_SHIFT)) >> PAD_MUX_MODE_SHIFT) > 0)
75 return GPIOF_FUNC;
76 if (g_state & PAD_CTL_OBE_ENABLE)
77 return GPIOF_OUTPUT;
78 if (g_state & PAD_CTL_IBE_ENABLE)
79 return GPIOF_INPUT;
80 if (!(g_state & PAD_CTL_OBE_IBE_ENABLE))
81 return GPIOF_UNUSED;
82
83 return GPIOF_UNKNOWN;
84 }
85
86 static const struct dm_gpio_ops gpio_vybrid_ops = {
87 .direction_input = vybrid_gpio_direction_input,
88 .direction_output = vybrid_gpio_direction_output,
89 .get_value = vybrid_gpio_get_value,
90 .set_value = vybrid_gpio_set_value,
91 .get_function = vybrid_gpio_get_function,
92 };
93
vybrid_gpio_probe(struct udevice * dev)94 static int vybrid_gpio_probe(struct udevice *dev)
95 {
96 struct vybrid_gpios *gpios = dev_get_priv(dev);
97 struct vybrid_gpio_plat *plat = dev_get_plat(dev);
98 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
99
100 uc_priv->bank_name = plat->port_name;
101 uc_priv->gpio_count = VYBRID_GPIO_COUNT;
102 gpios->reg = (struct vybrid_gpio_regs *)plat->base;
103 gpios->chip = plat->chip;
104
105 return 0;
106 }
107
vybrid_gpio_odata_to_plat(struct udevice * dev)108 static int vybrid_gpio_odata_to_plat(struct udevice *dev)
109 {
110 struct vybrid_gpio_plat *plat = dev_get_plat(dev);
111 fdt_addr_t base_addr;
112
113 base_addr = dev_read_addr(dev);
114 if (base_addr == FDT_ADDR_T_NONE)
115 return -EINVAL;
116
117 plat->base = base_addr;
118 plat->chip = dev_seq(dev);
119 plat->port_name = fdt_get_name(gd->fdt_blob, dev_of_offset(dev), NULL);
120
121 return 0;
122 }
123
124 static const struct udevice_id vybrid_gpio_ids[] = {
125 { .compatible = "fsl,vf610-gpio" },
126 { }
127 };
128
129 U_BOOT_DRIVER(gpio_vybrid) = {
130 .name = "gpio_vybrid",
131 .id = UCLASS_GPIO,
132 .ops = &gpio_vybrid_ops,
133 .of_match = vybrid_gpio_ids,
134 .of_to_plat = vybrid_gpio_odata_to_plat,
135 .probe = vybrid_gpio_probe,
136 .priv_auto = sizeof(struct vybrid_gpios),
137 .plat_auto = sizeof(struct vybrid_gpio_plat),
138 };
139