124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
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* Copyright (C) 2011 Missing Link Electronics
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* Joachim Foerster <joachim@missinglinkelectronics.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <malloc.h>
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#include <fdtdec.h>
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#include <asm/global_data.h>
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#include <asm/io.h>
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#include <asm/gpio.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct altera_pio_regs {
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u32 data; /* Data register */
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u32 direction; /* Direction register */
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};
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struct altera_pio_plat {
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struct altera_pio_regs *regs;
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int gpio_count;
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const char *bank_name;
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};
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static int altera_pio_direction_input(struct udevice *dev, unsigned pin)
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{
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struct altera_pio_plat *plat = dev_get_plat(dev);
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struct altera_pio_regs *const regs = plat->regs;
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clrbits_le32(®s->direction, 1 << pin);
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return 0;
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}
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static int altera_pio_direction_output(struct udevice *dev, unsigned pin,
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int val)
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{
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struct altera_pio_plat *plat = dev_get_plat(dev);
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struct altera_pio_regs *const regs = plat->regs;
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if (val)
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setbits_le32(®s->data, 1 << pin);
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else
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clrbits_le32(®s->data, 1 << pin);
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/* change the data first, then the direction. to avoid glitch */
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setbits_le32(®s->direction, 1 << pin);
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return 0;
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}
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static int altera_pio_get_value(struct udevice *dev, unsigned pin)
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{
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struct altera_pio_plat *plat = dev_get_plat(dev);
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struct altera_pio_regs *const regs = plat->regs;
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return !!(readl(®s->data) & (1 << pin));
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}
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static int altera_pio_set_value(struct udevice *dev, unsigned pin, int val)
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{
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struct altera_pio_plat *plat = dev_get_plat(dev);
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struct altera_pio_regs *const regs = plat->regs;
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if (val)
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setbits_le32(®s->data, 1 << pin);
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else
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clrbits_le32(®s->data, 1 << pin);
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return 0;
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}
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static int altera_pio_probe(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct altera_pio_plat *plat = dev_get_plat(dev);
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uc_priv->gpio_count = plat->gpio_count;
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uc_priv->bank_name = plat->bank_name;
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return 0;
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}
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static int altera_pio_of_to_plat(struct udevice *dev)
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{
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struct altera_pio_plat *plat = dev_get_plat(dev);
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plat->regs = map_physmem(dev_read_addr(dev),
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sizeof(struct altera_pio_regs),
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MAP_NOCACHE);
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plat->gpio_count = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
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"altr,gpio-bank-width", 32);
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plat->bank_name = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
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"gpio-bank-name", NULL);
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return 0;
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}
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static const struct dm_gpio_ops altera_pio_ops = {
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.direction_input = altera_pio_direction_input,
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.direction_output = altera_pio_direction_output,
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.get_value = altera_pio_get_value,
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.set_value = altera_pio_set_value,
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};
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static const struct udevice_id altera_pio_ids[] = {
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{ .compatible = "altr,pio-1.0" },
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{ }
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};
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U_BOOT_DRIVER(altera_pio) = {
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.name = "altera_pio",
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.id = UCLASS_GPIO,
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.of_match = altera_pio_ids,
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.ops = &altera_pio_ops,
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.of_to_plat = altera_pio_of_to_plat,
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.plat_auto = sizeof(struct altera_pio_plat),
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.probe = altera_pio_probe,
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};
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