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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-09 GuEe-GUI first version
*/
#include <rtthread.h>
#include "8250.h"
struct ofw_platform_8250
{
struct serial8250 parent;
struct rt_reset_control *rstc;
};
#define to_ofw_platform_8250(serial8250) rt_container_of(serial8250, struct ofw_platform_8250, parent)
static void ofw_platform_8250_free_resource(struct ofw_platform_8250 *op8250)
{
struct serial8250 *serial = &op8250->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);
}
if (!rt_is_err_or_null(op8250->rstc))
{
rt_reset_control_put(op8250->rstc);
}
rt_free(op8250);
}
static void op8250_remove(struct serial8250 *serial)
{
struct ofw_platform_8250 *op8250 = to_ofw_platform_8250(serial);
ofw_platform_8250_free_resource(op8250);
}
static rt_err_t ofw_platform_8250_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
rt_uint32_t val;
struct serial8250 *serial;
struct ofw_platform_8250 *op8250;
struct rt_ofw_node *np = pdev->parent.ofw_node;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
if (rt_ofw_prop_read_bool(np, "used-by-rtas"))
{
return -RT_EBUSY;
}
op8250 = serial8250_alloc(op8250);
if (!op8250)
{
return -RT_ENOMEM;
}
serial = &op8250->parent;
serial->base = rt_ofw_iomap(np, 0);
if (!serial->base)
{
err = -RT_EIO;
goto _fail;
}
serial->irq = rt_ofw_get_irq(np, 0);
if (serial->irq < 0)
{
err = serial->irq;
goto _fail;
}
if (!rt_ofw_prop_read_u32(np, "clock-frequency", &val))
{
serial->freq = val;
}
else
{
serial->clk = rt_ofw_get_clk(np, 0);
if (rt_is_err(serial->clk))
{
err = rt_ptr_err(serial->clk);
goto _fail;
}
if ((err = rt_clk_prepare_enable(serial->clk)))
{
goto _fail;
}
serial->freq = rt_clk_get_rate(serial->clk);
}
if (!rt_ofw_prop_read_u32(np, "reg-shift", &val))
{
serial->regshift = val;
}
serial->iotype = PORT_MMIO;
if (!rt_ofw_prop_read_u32(np, "reg-io-width", &val))
{
switch (val)
{
case 1:
serial->iotype = PORT_MMIO;
break;
case 2:
serial->iotype = PORT_MMIO16;
break;
case 4:
serial->iotype = rt_ofw_prop_read_bool(np, "big-endian") ?
PORT_MMIO32BE : PORT_MMIO32;
break;
}
}
op8250->rstc = rt_ofw_get_reset_control_by_index(np, 0);
if (rt_is_err(op8250->rstc))
{
err = rt_ptr_err(op8250->rstc);
goto _fail;
}
if (op8250->rstc && (err = rt_reset_control_deassert(op8250->rstc)))
{
goto _fail;
}
rt_dm_dev_bind_fwdata(&serial->parent.parent, pdev->parent.ofw_node, &serial->parent);
pdev->parent.user_data = serial;
serial->parent.ops = &serial8250_uart_ops;
serial->parent.config = config;
serial->remove = &op8250_remove;
serial->data = op8250;
if ((err = serial8250_setup(serial)))
{
goto _fail;
}
return RT_EOK;
_fail:
ofw_platform_8250_free_resource(op8250);
return err;
}
static rt_err_t ofw_platform_8250_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 ofw_platform_8250_ofw_ids[] =
{
{ .type = "ttyS", .compatible = "ns16550a" },
{ .type = "ttyS", .compatible = "ns16550" },
#ifndef RT_SERIAL_8250_BCM7271
{ .type = "ttyS", .compatible = "brcm,bcm7271-uart" },
#endif
{ /* sentinel */ }
};
static struct rt_platform_driver ofw_platform_8250_driver =
{
.name = "8250-ofw",
.ids = ofw_platform_8250_ofw_ids,
.probe = ofw_platform_8250_probe,
.remove = ofw_platform_8250_remove,
};
static int ofw_platform_8250_drv_register(void)
{
rt_platform_driver_register(&ofw_platform_8250_driver);
return 0;
}
INIT_PLATFORM_EXPORT(ofw_platform_8250_drv_register);
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