1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2019 DEIF A/S
4 *
5 * GPIO driver to set/clear SPISEL_BOOT pin on mpc83xx.
6 */
7
8 #include <log.h>
9 #include <dm.h>
10 #include <mapmem.h>
11 #include <asm/gpio.h>
12
13 struct mpc83xx_spisel_boot {
14 u32 __iomem *spi_cs;
15 ulong addr;
16 uint gpio_count;
17 ulong type;
18 };
19
gpio_mask(uint gpio)20 static u32 gpio_mask(uint gpio)
21 {
22 return (1U << (31 - (gpio)));
23 }
24
mpc83xx_spisel_boot_direction_input(struct udevice * dev,uint gpio)25 static int mpc83xx_spisel_boot_direction_input(struct udevice *dev, uint gpio)
26 {
27 return -EINVAL;
28 }
29
mpc83xx_spisel_boot_set_value(struct udevice * dev,uint gpio,int value)30 static int mpc83xx_spisel_boot_set_value(struct udevice *dev, uint gpio, int value)
31 {
32 struct mpc83xx_spisel_boot *data = dev_get_priv(dev);
33
34 debug("%s: gpio=%d, value=%u, gpio_mask=0x%08x\n", __func__,
35 gpio, value, gpio_mask(gpio));
36
37 if (value)
38 setbits_be32(data->spi_cs, gpio_mask(gpio));
39 else
40 clrbits_be32(data->spi_cs, gpio_mask(gpio));
41
42 return 0;
43 }
44
mpc83xx_spisel_boot_direction_output(struct udevice * dev,uint gpio,int value)45 static int mpc83xx_spisel_boot_direction_output(struct udevice *dev, uint gpio, int value)
46 {
47 return 0;
48 }
49
mpc83xx_spisel_boot_get_value(struct udevice * dev,uint gpio)50 static int mpc83xx_spisel_boot_get_value(struct udevice *dev, uint gpio)
51 {
52 struct mpc83xx_spisel_boot *data = dev_get_priv(dev);
53
54 return !!(in_be32(data->spi_cs) & gpio_mask(gpio));
55 }
56
mpc83xx_spisel_boot_get_function(struct udevice * dev,uint gpio)57 static int mpc83xx_spisel_boot_get_function(struct udevice *dev, uint gpio)
58 {
59 return GPIOF_OUTPUT;
60 }
61
62 #if CONFIG_IS_ENABLED(OF_CONTROL)
mpc83xx_spisel_boot_of_to_plat(struct udevice * dev)63 static int mpc83xx_spisel_boot_of_to_plat(struct udevice *dev)
64 {
65 struct mpc8xxx_gpio_plat *plat = dev_get_plat(dev);
66 fdt_addr_t addr;
67 u32 reg[2];
68
69 dev_read_u32_array(dev, "reg", reg, 2);
70 addr = dev_translate_address(dev, reg);
71
72 plat->addr = addr;
73 plat->size = reg[1];
74 plat->ngpios = dev_read_u32_default(dev, "ngpios", 1);
75
76 return 0;
77 }
78 #endif
79
mpc83xx_spisel_boot_plat_to_priv(struct udevice * dev)80 static int mpc83xx_spisel_boot_plat_to_priv(struct udevice *dev)
81 {
82 struct mpc83xx_spisel_boot *priv = dev_get_priv(dev);
83 struct mpc8xxx_gpio_plat *plat = dev_get_plat(dev);
84 unsigned long size = plat->size;
85 ulong driver_data = dev_get_driver_data(dev);
86
87 if (size == 0)
88 size = 0x04;
89
90 priv->addr = plat->addr;
91 priv->spi_cs = map_sysmem(plat->addr, size);
92
93 if (!priv->spi_cs)
94 return -ENOMEM;
95
96 priv->gpio_count = plat->ngpios;
97
98 priv->type = driver_data;
99
100 return 0;
101 }
102
mpc83xx_spisel_boot_probe(struct udevice * dev)103 static int mpc83xx_spisel_boot_probe(struct udevice *dev)
104 {
105 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
106 struct mpc83xx_spisel_boot *data = dev_get_priv(dev);
107 char name[32], *str;
108
109 mpc83xx_spisel_boot_plat_to_priv(dev);
110
111 snprintf(name, sizeof(name), "MPC@%lx_", data->addr);
112 str = strdup(name);
113
114 if (!str)
115 return -ENOMEM;
116
117 uc_priv->bank_name = str;
118 uc_priv->gpio_count = data->gpio_count;
119
120 return 0;
121 }
122
123 static const struct dm_gpio_ops mpc83xx_spisel_boot_ops = {
124 .direction_input = mpc83xx_spisel_boot_direction_input,
125 .direction_output = mpc83xx_spisel_boot_direction_output,
126 .get_value = mpc83xx_spisel_boot_get_value,
127 .set_value = mpc83xx_spisel_boot_set_value,
128 .get_function = mpc83xx_spisel_boot_get_function,
129 };
130
131 static const struct udevice_id mpc83xx_spisel_boot_ids[] = {
132 { .compatible = "fsl,mpc8309-spisel-boot" },
133 { .compatible = "fsl,mpc83xx-spisel-boot" },
134 { /* sentinel */ }
135 };
136
137 U_BOOT_DRIVER(spisel_boot_mpc83xx) = {
138 .name = "spisel_boot_mpc83xx",
139 .id = UCLASS_GPIO,
140 .ops = &mpc83xx_spisel_boot_ops,
141 #if CONFIG_IS_ENABLED(OF_CONTROL)
142 .of_to_plat = mpc83xx_spisel_boot_of_to_plat,
143 .plat_auto = sizeof(struct mpc8xxx_gpio_plat),
144 .of_match = mpc83xx_spisel_boot_ids,
145 #endif
146 .probe = mpc83xx_spisel_boot_probe,
147 .priv_auto = sizeof(struct mpc83xx_spisel_boot),
148 };
149