u-boot/drivers/gpio/pic32_gpio.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

164 lines
3.6 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2015 Microchip Technology Inc
* Purna Chandra Mandal <purna.mandal@microchip.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <linux/compat.h>
#include <mach/pic32.h>
DECLARE_GLOBAL_DATA_PTR;
/* Peripheral Pin Control */
struct pic32_reg_port {
struct pic32_reg_atomic ansel;
struct pic32_reg_atomic tris;
struct pic32_reg_atomic port;
struct pic32_reg_atomic lat;
struct pic32_reg_atomic open_drain;
struct pic32_reg_atomic cnpu;
struct pic32_reg_atomic cnpd;
struct pic32_reg_atomic cncon;
};
enum {
MICROCHIP_GPIO_DIR_OUT,
MICROCHIP_GPIO_DIR_IN,
MICROCHIP_GPIOS_PER_BANK = 16,
};
struct pic32_gpio_priv {
struct pic32_reg_port *regs;
char name[2];
};
static int pic32_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct pic32_gpio_priv *priv = dev_get_priv(dev);
return !!(readl(&priv->regs->port.raw) & BIT(offset));
}
static int pic32_gpio_set_value(struct udevice *dev, unsigned offset,
int value)
{
struct pic32_gpio_priv *priv = dev_get_priv(dev);
int mask = BIT(offset);
if (value)
writel(mask, &priv->regs->port.set);
else
writel(mask, &priv->regs->port.clr);
return 0;
}
static int pic32_gpio_direction(struct udevice *dev, unsigned offset)
{
struct pic32_gpio_priv *priv = dev_get_priv(dev);
/* pin in analog mode ? */
if (readl(&priv->regs->ansel.raw) & BIT(offset))
return -EPERM;
if (readl(&priv->regs->tris.raw) & BIT(offset))
return MICROCHIP_GPIO_DIR_IN;
else
return MICROCHIP_GPIO_DIR_OUT;
}
static int pic32_gpio_direction_input(struct udevice *dev, unsigned offset)
{
struct pic32_gpio_priv *priv = dev_get_priv(dev);
int mask = BIT(offset);
writel(mask, &priv->regs->ansel.clr);
writel(mask, &priv->regs->tris.set);
return 0;
}
static int pic32_gpio_direction_output(struct udevice *dev,
unsigned offset, int value)
{
struct pic32_gpio_priv *priv = dev_get_priv(dev);
int mask = BIT(offset);
writel(mask, &priv->regs->ansel.clr);
writel(mask, &priv->regs->tris.clr);
pic32_gpio_set_value(dev, offset, value);
return 0;
}
static int pic32_gpio_get_function(struct udevice *dev, unsigned offset)
{
int ret = GPIOF_UNUSED;
switch (pic32_gpio_direction(dev, offset)) {
case MICROCHIP_GPIO_DIR_OUT:
ret = GPIOF_OUTPUT;
break;
case MICROCHIP_GPIO_DIR_IN:
ret = GPIOF_INPUT;
break;
default:
ret = GPIOF_UNUSED;
break;
}
return ret;
}
static const struct dm_gpio_ops gpio_pic32_ops = {
.direction_input = pic32_gpio_direction_input,
.direction_output = pic32_gpio_direction_output,
.get_value = pic32_gpio_get_value,
.set_value = pic32_gpio_set_value,
.get_function = pic32_gpio_get_function,
};
static int pic32_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct pic32_gpio_priv *priv = dev_get_priv(dev);
fdt_addr_t addr;
fdt_size_t size;
char *end;
int bank;
addr = fdtdec_get_addr_size(gd->fdt_blob, dev_of_offset(dev), "reg",
&size);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->regs = ioremap(addr, size);
uc_priv->gpio_count = MICROCHIP_GPIOS_PER_BANK;
/* extract bank name */
end = strrchr(dev->name, '@');
bank = trailing_strtoln(dev->name, end);
priv->name[0] = 'A' + bank;
uc_priv->bank_name = priv->name;
return 0;
}
static const struct udevice_id pic32_gpio_ids[] = {
{ .compatible = "microchip,pic32mzda-gpio" },
{ }
};
U_BOOT_DRIVER(gpio_pic32) = {
.name = "gpio_pic32",
.id = UCLASS_GPIO,
.of_match = pic32_gpio_ids,
.ops = &gpio_pic32_ops,
.probe = pic32_gpio_probe,
.priv_auto_alloc_size = sizeof(struct pic32_gpio_priv),
};