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https://github.com/AsahiLinux/u-boot
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d100d3e18e
Add Faraday Technology's FTGPIO010 controller driver. Signed-off-by: Sergei Antonov <saproj@gmail.com>
111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Faraday Technology's FTGPIO010 controller.
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*/
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#include <common.h>
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#include <dm.h>
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#include <asm/io.h>
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#include <asm/gpio.h>
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struct ftgpio010_regs {
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u32 out;
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u32 in;
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u32 direction; // 1 - output
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u32 reserved;
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u32 set;
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u32 clear;
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};
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struct ftgpio010_plat {
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struct ftgpio010_regs __iomem *regs;
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};
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static int ftgpio010_direction_input(struct udevice *dev, unsigned int pin)
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{
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struct ftgpio010_plat *plat = dev_get_plat(dev);
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struct ftgpio010_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 ftgpio010_direction_output(struct udevice *dev, unsigned int pin,
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int val)
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{
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struct ftgpio010_plat *plat = dev_get_plat(dev);
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struct ftgpio010_regs *const regs = plat->regs;
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/* change the data first, then the direction. to avoid glitch */
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out_le32(val ? ®s->set : ®s->clear, 1 << pin);
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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 ftgpio010_get_value(struct udevice *dev, unsigned int pin)
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{
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struct ftgpio010_plat *plat = dev_get_plat(dev);
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struct ftgpio010_regs *const regs = plat->regs;
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return in_le32(®s->in) >> pin & 1;
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}
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static int ftgpio010_set_value(struct udevice *dev, unsigned int pin, int val)
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{
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struct ftgpio010_plat *plat = dev_get_plat(dev);
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struct ftgpio010_regs *const regs = plat->regs;
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out_le32(val ? ®s->set : ®s->clear, 1 << pin);
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return 0;
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}
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static int ftgpio010_get_function(struct udevice *dev, unsigned int pin)
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{
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struct ftgpio010_plat *plat = dev_get_plat(dev);
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struct ftgpio010_regs *const regs = plat->regs;
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if (in_le32(®s->direction) >> pin & 1)
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return GPIOF_OUTPUT;
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return GPIOF_INPUT;
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}
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static int ftgpio010_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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uc_priv->gpio_count = ofnode_read_u32_default(dev_ofnode(dev),
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"nr-gpios", 32);
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return 0;
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}
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static int ftgpio010_of_to_plat(struct udevice *dev)
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{
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struct ftgpio010_plat *plat = dev_get_plat(dev);
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plat->regs = dev_read_addr_ptr(dev);
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return 0;
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}
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static const struct dm_gpio_ops ftgpio010_ops = {
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.direction_input = ftgpio010_direction_input,
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.direction_output = ftgpio010_direction_output,
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.get_value = ftgpio010_get_value,
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.set_value = ftgpio010_set_value,
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.get_function = ftgpio010_get_function,
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};
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static const struct udevice_id ftgpio010_ids[] = {
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{ .compatible = "faraday,ftgpio010" },
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{ }
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};
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U_BOOT_DRIVER(ftgpio010) = {
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.name = "ftgpio010",
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.id = UCLASS_GPIO,
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.of_match = ftgpio010_ids,
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.ops = &ftgpio010_ops,
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.of_to_plat = ftgpio010_of_to_plat,
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.plat_auto = sizeof(struct ftgpio010_plat),
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.probe = ftgpio010_probe,
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};
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