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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-16 GuEe-GUI first version
*/
#include <rtthread.h>
#include "8250.h"
#define BCM2835_AUX_UART_CNTL 8
#define BCM2835_AUX_UART_CNTL_RXEN 0x01 /* Receiver enable */
#define BCM2835_AUX_UART_CNTL_TXEN 0x02 /* Transmitter enable */
#define BCM2835_AUX_UART_CNTL_AUTORTS 0x04 /* RTS set by RX fill level */
#define BCM2835_AUX_UART_CNTL_AUTOCTS 0x08 /* CTS stops transmitter */
#define BCM2835_AUX_UART_CNTL_RTS3 0x00 /* RTS set until 3 chars left */
#define BCM2835_AUX_UART_CNTL_RTS2 0x10 /* RTS set until 2 chars left */
#define BCM2835_AUX_UART_CNTL_RTS1 0x20 /* RTS set until 1 chars left */
#define BCM2835_AUX_UART_CNTL_RTS4 0x30 /* RTS set until 4 chars left */
#define BCM2835_AUX_UART_CNTL_RTSINV 0x40 /* Invert auto RTS polarity */
#define BCM2835_AUX_UART_CNTL_CTSINV 0x80 /* Invert auto CTS polarity */
struct bcm2835aux
{
struct serial8250 parent;
rt_uint32_t cntl;
};
#define to_bcm2835aux(serial8250) rt_container_of(serial8250, struct bcm2835aux, parent)
static void bcm2835aux_free_resource(struct bcm2835aux *bcm2835aux)
{
struct serial8250 *serial = &bcm2835aux->parent;
if (serial->base)
{
rt_iounmap(serial->base);
}
if (!rt_is_err_or_null(serial->clk))
{
rt_clk_disable_unprepare(serial->clk);
rt_clk_put(serial->clk);
}
rt_free(bcm2835aux);
}
static void bcm2835aux_serial_remove(struct serial8250 *serial)
{
struct bcm2835aux *bcm2835aux = to_bcm2835aux(serial);
bcm2835aux_free_resource(bcm2835aux);
}
static rt_err_t bcm2835aux_probe(struct rt_platform_device *pdev)
{
rt_err_t err = RT_EOK;
struct serial8250 *serial;
struct rt_device *dev = &pdev->parent;
struct bcm2835aux *bcm2835aux = serial8250_alloc(bcm2835aux);
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
if (!bcm2835aux)
{
return -RT_ENOMEM;
}
serial = &bcm2835aux->parent;
serial->base = rt_dm_dev_iomap(dev, 0);
if (!serial->base)
{
err = -RT_ERROR;
goto _free_res;
}
serial->irq = rt_dm_dev_get_irq(dev, 0);
if (serial->irq < 0)
{
err = serial->irq;
goto _free_res;
}
serial->clk = rt_clk_get_by_index(dev, 0);
if (rt_is_err(serial->clk))
{
err = rt_ptr_err(serial->clk);
goto _free_res;
}
if ((err = rt_clk_enable(serial->clk)))
{
goto _free_res;
}
serial->freq = rt_clk_get_rate(serial->clk);
dev->user_data = serial;
rt_dm_dev_bind_fwdata(&serial->parent.parent, pdev->parent.ofw_node, &serial->parent);
serial->parent.ops = &serial8250_uart_ops;
serial->parent.config = config;
serial->regshift = 2;
serial->iotype = PORT_MMIO;
serial->remove = &bcm2835aux_serial_remove;
serial->data = bcm2835aux;
bcm2835aux->cntl = BCM2835_AUX_UART_CNTL_RXEN | BCM2835_AUX_UART_CNTL_TXEN;
if ((err = serial8250_setup(serial)))
{
goto _free_res;
}
return RT_EOK;
_free_res:
bcm2835aux_free_resource(bcm2835aux);
return err;
}
static rt_err_t bcm2835aux_remove(struct rt_platform_device *pdev)
{
struct rt_device *dev = &pdev->parent;
struct serial8250 *serial = dev->user_data;
rt_dm_dev_unbind_fwdata(dev, RT_NULL);
return serial8250_remove(serial);
}
static const struct rt_ofw_node_id bcm2835aux_ofw_ids[] =
{
{ .type = "ttyS", .compatible = "brcm,bcm2835-aux-uart" },
{ /* sentinel */ }
};
static struct rt_platform_driver bcm2835aux_driver =
{
.name = "bcm2835-aux-uart",
.ids = bcm2835aux_ofw_ids,
.probe = bcm2835aux_probe,
.remove = bcm2835aux_remove,
};
static int bcm2835aux_drv_register(void)
{
rt_platform_driver_register(&bcm2835aux_driver);
return 0;
}
INIT_PLATFORM_EXPORT(bcm2835aux_drv_register);
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