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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-26 GuEe-GUI first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include <firmware-raspberrypi.h>
#include "dev_pin_dm.h"
#define NUM_GPIO 2
struct brcmvirt_gpio
{
struct rt_device_pin parent;
rt_uint32_t *ts_base;
rt_uint32_t enables_disables[NUM_GPIO];
rt_ubase_t bus_addr;
};
#define raw_to_brcmvirt_gpio(raw) rt_container_of(raw, struct brcmvirt_gpio, parent)
static void brcmvirt_gpio_mode(struct rt_device *device, rt_base_t pin, rt_uint8_t mode)
{
}
static void brcmvirt_gpio_write(struct rt_device *device, rt_base_t pin, rt_uint8_t value)
{
rt_bool_t lit;
rt_uint16_t enables, disables;
struct brcmvirt_gpio *gpio = raw_to_brcmvirt_gpio(device);
enables = gpio->enables_disables[pin] >> 16;
disables = gpio->enables_disables[pin] >> 0;
lit = (rt_int16_t)(enables - disables) > 0;
if ((value && lit) || (!value && !lit))
{
return;
}
if (value)
{
enables++;
}
else
{
disables++;
}
gpio->enables_disables[pin] = (enables << 16) | (disables << 0);
HWREG32(gpio->ts_base + pin) = gpio->enables_disables[pin];
}
static rt_ssize_t brcmvirt_gpio_read(struct rt_device *device, rt_base_t pin)
{
rt_uint32_t value;
struct brcmvirt_gpio *gpio = raw_to_brcmvirt_gpio(device);
value = HWREG32(gpio->ts_base + pin);
return (rt_int16_t)((value >> 16) - value) > 0;
}
static const struct rt_pin_ops brcmvirt_gpio_ops =
{
.pin_mode = brcmvirt_gpio_mode,
.pin_write = brcmvirt_gpio_write,
.pin_read = brcmvirt_gpio_read,
};
static rt_err_t brcmvirt_gpio_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
void *ts_base;
rt_uint32_t virtbuf;
struct rpi_firmware *rpi_fw = RT_NULL;
struct rt_device *dev = &pdev->parent;
struct rt_ofw_node *np = dev->ofw_node, *fw_np;
struct brcmvirt_gpio *gpio = rt_calloc(1, sizeof(*gpio));
if (!gpio)
{
return -RT_ENOMEM;
}
fw_np = rt_ofw_parse_phandle(np, "firmware", 0);
if (!fw_np)
{
err = -RT_EINVAL;
goto _fail;
}
rpi_fw = rpi_firmware_get(fw_np);
rt_ofw_node_put(fw_np);
if (!rpi_fw)
{
err = -RT_EINVAL;
goto _fail;
}
ts_base = rt_dma_alloc_coherent(dev, ARCH_PAGE_SIZE, &gpio->bus_addr);
if (!ts_base)
{
err = -RT_ENOMEM;
goto _fail;
}
virtbuf = (rt_uint32_t)gpio->bus_addr;
err = rpi_firmware_property(rpi_fw,
RPI_FIRMWARE_FRAMEBUFFER_SET_GPIOVIRTBUF, &gpio->bus_addr, sizeof(virtbuf));
if (err)
{
goto _fail;
}
err = rpi_firmware_property(rpi_fw,
RPI_FIRMWARE_FRAMEBUFFER_GET_GPIOVIRTBUF, &virtbuf, sizeof(virtbuf));
if (err)
{
goto _fail;
}
virtbuf &= ~0xc0000000;
gpio->ts_base = rt_ioremap((void *)(rt_ubase_t)virtbuf, ARCH_PAGE_SIZE);
if (!gpio->ts_base)
{
goto _fail;
}
rt_dm_dev_bind_fwdata(dev, RT_NULL, &gpio->parent);
gpio->parent.ops = &brcmvirt_gpio_ops;
pin_api_init(&gpio->parent, NUM_GPIO);
return RT_EOK;
_fail:
if (gpio->bus_addr)
{
rt_dma_free_coherent(dev, ARCH_PAGE_SIZE, ts_base, gpio->bus_addr);
}
if (rpi_fw)
{
rpi_firmware_put(rpi_fw);
}
rt_free(gpio);
return err;
}
static const struct rt_ofw_node_id brcmvirt_gpio_ofw_ids[] =
{
{ .compatible = "brcm,bcm2835-virtgpio" },
{ /* sentinel */ }
};
static struct rt_platform_driver brcmvirt_gpio_driver =
{
.name = "brcmvirt-gpio",
.ids = brcmvirt_gpio_ofw_ids,
.probe = brcmvirt_gpio_probe,
};
static int brcmvirt_gpio_drv_register(void)
{
rt_platform_driver_register(&brcmvirt_gpio_driver);
return 0;
}
INIT_SUBSYS_EXPORT(brcmvirt_gpio_drv_register);
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