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