2 * Copyright (C) 2012 Vikram Narayananan
3 * <vikram186@gmail.com>
5 * SPDX-License-Identifier: GPL-2.0+
14 struct bcm2835_gpios
{
15 struct bcm2835_gpio_regs
*reg
;
18 static int bcm2835_gpio_direction_input(struct udevice
*dev
, unsigned gpio
)
20 struct bcm2835_gpios
*gpios
= dev_get_priv(dev
);
23 val
= readl(&gpios
->reg
->gpfsel
[BCM2835_GPIO_FSEL_BANK(gpio
)]);
24 val
&= ~(BCM2835_GPIO_FSEL_MASK
<< BCM2835_GPIO_FSEL_SHIFT(gpio
));
25 val
|= (BCM2835_GPIO_INPUT
<< BCM2835_GPIO_FSEL_SHIFT(gpio
));
26 writel(val
, &gpios
->reg
->gpfsel
[BCM2835_GPIO_FSEL_BANK(gpio
)]);
31 static int bcm2835_gpio_direction_output(struct udevice
*dev
, unsigned gpio
,
34 struct bcm2835_gpios
*gpios
= dev_get_priv(dev
);
37 gpio_set_value(gpio
, value
);
39 val
= readl(&gpios
->reg
->gpfsel
[BCM2835_GPIO_FSEL_BANK(gpio
)]);
40 val
&= ~(BCM2835_GPIO_FSEL_MASK
<< BCM2835_GPIO_FSEL_SHIFT(gpio
));
41 val
|= (BCM2835_GPIO_OUTPUT
<< BCM2835_GPIO_FSEL_SHIFT(gpio
));
42 writel(val
, &gpios
->reg
->gpfsel
[BCM2835_GPIO_FSEL_BANK(gpio
)]);
47 static int bcm2835_get_value(const struct bcm2835_gpios
*gpios
, unsigned gpio
)
51 val
= readl(&gpios
->reg
->gplev
[BCM2835_GPIO_COMMON_BANK(gpio
)]);
53 return (val
>> BCM2835_GPIO_COMMON_SHIFT(gpio
)) & 0x1;
56 static int bcm2835_gpio_get_value(struct udevice
*dev
, unsigned gpio
)
58 const struct bcm2835_gpios
*gpios
= dev_get_priv(dev
);
60 return bcm2835_get_value(gpios
, gpio
);
63 static int bcm2835_gpio_set_value(struct udevice
*dev
, unsigned gpio
,
66 struct bcm2835_gpios
*gpios
= dev_get_priv(dev
);
67 u32
*output_reg
= value
? gpios
->reg
->gpset
: gpios
->reg
->gpclr
;
69 writel(1 << BCM2835_GPIO_COMMON_SHIFT(gpio
),
70 &output_reg
[BCM2835_GPIO_COMMON_BANK(gpio
)]);
75 int bcm2835_gpio_get_func_id(struct udevice
*dev
, unsigned gpio
)
77 struct bcm2835_gpios
*gpios
= dev_get_priv(dev
);
80 val
= readl(&gpios
->reg
->gpfsel
[BCM2835_GPIO_FSEL_BANK(gpio
)]);
82 return (val
>> BCM2835_GPIO_FSEL_SHIFT(gpio
) & BCM2835_GPIO_FSEL_MASK
);
85 static int bcm2835_gpio_get_function(struct udevice
*dev
, unsigned offset
)
87 int funcid
= bcm2835_gpio_get_func_id(dev
, offset
);
90 case BCM2835_GPIO_OUTPUT
:
92 case BCM2835_GPIO_INPUT
:
100 static const struct dm_gpio_ops gpio_bcm2835_ops
= {
101 .direction_input
= bcm2835_gpio_direction_input
,
102 .direction_output
= bcm2835_gpio_direction_output
,
103 .get_value
= bcm2835_gpio_get_value
,
104 .set_value
= bcm2835_gpio_set_value
,
105 .get_function
= bcm2835_gpio_get_function
,
108 static int bcm2835_gpio_probe(struct udevice
*dev
)
110 struct bcm2835_gpios
*gpios
= dev_get_priv(dev
);
111 struct bcm2835_gpio_platdata
*plat
= dev_get_platdata(dev
);
112 struct gpio_dev_priv
*uc_priv
= dev_get_uclass_priv(dev
);
114 uc_priv
->bank_name
= "GPIO";
115 uc_priv
->gpio_count
= BCM2835_GPIO_COUNT
;
116 gpios
->reg
= (struct bcm2835_gpio_regs
*)plat
->base
;
121 U_BOOT_DRIVER(gpio_bcm2835
) = {
122 .name
= "gpio_bcm2835",
124 .ops
= &gpio_bcm2835_ops
,
125 .probe
= bcm2835_gpio_probe
,
126 .flags
= DM_FLAG_PRE_RELOC
,
127 .priv_auto_alloc_size
= sizeof(struct bcm2835_gpios
),