| /* |
| * Copyright (C) 2017 Amlogic, Inc. All rights reserved. |
| * * |
| This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * * |
| This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * * |
| You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| * * |
| Description: |
| */ |
| |
| #include <common.h> |
| #include <dm.h> |
| #include <asm/gpio.h> |
| #include <asm/io.h> |
| #include <asm/errno.h> |
| #include <aml_gpio.h> |
| extern int clear_pinmux(unsigned int pin); |
| /* set GPIO pin 'gpio' as an input */ |
| static int aml_gpio_direction_input(struct udevice *dev, unsigned offset) |
| { |
| struct meson_bank *plat = dev_get_platdata(dev); |
| unsigned int reg = plat->regs[REG_DIR].reg; |
| unsigned int bit = plat->regs[REG_DIR].bit + offset; |
| regmap_update_bits(reg,BIT(bit),BIT(bit)); |
| return 0; |
| } |
| |
| /* set GPIO pin 'gpio' as an output, with polarity 'value' */ |
| static int aml_gpio_direction_output(struct udevice *dev, unsigned offset, |
| int value) |
| { |
| struct meson_bank *plat = dev_get_platdata(dev); |
| unsigned long reg = plat->regs[REG_OUT].reg; |
| unsigned int bit = plat->regs[REG_OUT].bit + offset; |
| regmap_update_bits(reg,BIT(bit),value ? BIT(bit) : 0); |
| reg = plat->regs[REG_DIR].reg; |
| bit = plat->regs[REG_DIR].bit + offset; |
| regmap_update_bits(reg,BIT(bit),0); |
| |
| return 0; |
| } |
| |
| /* read GPIO IN value of pin 'gpio' */ |
| static int aml_gpio_get_value(struct udevice *dev, unsigned offset) |
| { |
| struct meson_bank *plat = dev_get_platdata(dev); |
| unsigned long reg = plat->regs[REG_IN].reg; |
| unsigned int bit = plat->regs[REG_IN].bit + offset; |
| unsigned int val; |
| val = readl(reg); |
| |
| return !!(val & BIT(bit)); |
| } |
| |
| /* write GPIO OUT value to pin 'gpio' */ |
| static int aml_gpio_set_value(struct udevice *dev, unsigned offset, |
| int value) |
| { |
| struct meson_bank *plat = dev_get_platdata(dev); |
| unsigned int reg = plat->regs[REG_OUT].reg; |
| unsigned int bit = plat->regs[REG_OUT].bit + offset; |
| regmap_update_bits(reg,BIT(bit),value ? BIT(bit) : 0); |
| |
| return 0; |
| } |
| |
| static int aml_gpio_get_function(struct udevice *dev, unsigned offset) |
| { |
| |
| struct meson_bank *plat = dev_get_platdata(dev); |
| unsigned long reg = plat->regs[REG_DIR].reg; |
| unsigned int bit = plat->regs[REG_DIR].bit + offset; |
| unsigned int val; |
| val = readl(reg); |
| bool dir = !!(val * BIT(bit)); |
| |
| |
| /* GPIOF_FUNC is not implemented yet */ |
| if (dir) |
| return GPIOF_INPUT; |
| else |
| return GPIOF_OUTPUT; |
| } |
| static int aml_gpio_request(struct udevice *dev, unsigned offset, const char *label) |
| { |
| struct meson_bank *plat = dev_get_platdata(dev); |
| clear_pinmux(plat->first + offset); |
| return 0; |
| } |
| static const struct dm_gpio_ops gpio_aml_ops = { |
| .request = aml_gpio_request, |
| .direction_input = aml_gpio_direction_input, |
| .direction_output = aml_gpio_direction_output, |
| .get_value = aml_gpio_get_value, |
| .set_value = aml_gpio_set_value, |
| .get_function = aml_gpio_get_function, |
| }; |
| |
| static int aml_gpio_probe(struct udevice *dev) |
| { |
| struct meson_bank *plat = dev_get_platdata(dev); |
| struct gpio_dev_priv *uc_priv = dev->uclass_priv; |
| |
| uc_priv->bank_name = plat->name; |
| uc_priv->gpio_base = plat->first; |
| uc_priv->gpio_count = plat->last - plat->first +1; |
| |
| return 0; |
| } |
| |
| U_BOOT_DRIVER(gpio_aml) = { |
| .name = "gpio_aml", |
| .id = UCLASS_GPIO, |
| .ops = &gpio_aml_ops, |
| .probe = aml_gpio_probe, |
| }; |
| |