mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
65dabaf532
The fresh new serial driver for pxa produces warnings when
CONFIG_PM_SLEEP is disabled:
drivers/tty/serial/8250/8250_pxa.c:50:12: error: 'serial_pxa_resume' defined but not used [-Werror=unused-function]
drivers/tty/serial/8250/8250_pxa.c:41:12: error: 'serial_pxa_suspend' defined but not used [-Werror=unused-function]
This removes the #ifdef around the two functions and instead marks both
as __maybe_unused, which is more robust and avoids the warning.
Fixes: ab28f51c77
("serial: rewrite pxa2xx-uart to use 8250_core")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
191 lines
4.4 KiB
C
191 lines
4.4 KiB
C
/*
|
|
* drivers/tty/serial/8250/8250_pxa.c -- driver for PXA on-board UARTS
|
|
* Copyright: (C) 2013 Sergei Ianovich <ynvich@gmail.com>
|
|
*
|
|
* replaces drivers/serial/pxa.c by Nicolas Pitre
|
|
* Created: Feb 20, 2003
|
|
* Copyright: (C) 2003 Monta Vista Software, Inc.
|
|
*
|
|
* Based on drivers/serial/8250.c by Russell King.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/serial_8250.h>
|
|
#include <linux/serial_core.h>
|
|
#include <linux/serial_reg.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/pm_runtime.h>
|
|
|
|
#include "8250.h"
|
|
|
|
struct pxa8250_data {
|
|
int line;
|
|
struct clk *clk;
|
|
};
|
|
|
|
static int __maybe_unused serial_pxa_suspend(struct device *dev)
|
|
{
|
|
struct pxa8250_data *data = dev_get_drvdata(dev);
|
|
|
|
serial8250_suspend_port(data->line);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused serial_pxa_resume(struct device *dev)
|
|
{
|
|
struct pxa8250_data *data = dev_get_drvdata(dev);
|
|
|
|
serial8250_resume_port(data->line);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops serial_pxa_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(serial_pxa_suspend, serial_pxa_resume)
|
|
};
|
|
|
|
static const struct of_device_id serial_pxa_dt_ids[] = {
|
|
{ .compatible = "mrvl,pxa-uart", },
|
|
{ .compatible = "mrvl,mmp-uart", },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, serial_pxa_dt_ids);
|
|
|
|
/* Uart divisor latch write */
|
|
static void serial_pxa_dl_write(struct uart_8250_port *up, int value)
|
|
{
|
|
unsigned int dll;
|
|
|
|
serial_out(up, UART_DLL, value & 0xff);
|
|
/*
|
|
* work around Erratum #74 according to Marvel(R) PXA270M Processor
|
|
* Specification Update (April 19, 2010)
|
|
*/
|
|
dll = serial_in(up, UART_DLL);
|
|
WARN_ON(dll != (value & 0xff));
|
|
|
|
serial_out(up, UART_DLM, value >> 8 & 0xff);
|
|
}
|
|
|
|
|
|
static void serial_pxa_pm(struct uart_port *port, unsigned int state,
|
|
unsigned int oldstate)
|
|
{
|
|
struct pxa8250_data *data = port->private_data;
|
|
|
|
if (!state)
|
|
clk_prepare_enable(data->clk);
|
|
else
|
|
clk_disable_unprepare(data->clk);
|
|
}
|
|
|
|
static int serial_pxa_probe(struct platform_device *pdev)
|
|
{
|
|
struct uart_8250_port uart = {};
|
|
struct pxa8250_data *data;
|
|
struct resource *mmres, *irqres;
|
|
int ret;
|
|
|
|
mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
irqres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (!mmres || !irqres)
|
|
return -ENODEV;
|
|
|
|
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(data->clk))
|
|
return PTR_ERR(data->clk);
|
|
|
|
ret = clk_prepare(data->clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
uart.port.type = PORT_XSCALE;
|
|
uart.port.iotype = UPIO_MEM32;
|
|
uart.port.mapbase = mmres->start;
|
|
uart.port.regshift = 2;
|
|
uart.port.irq = irqres->start;
|
|
uart.port.fifosize = 64;
|
|
uart.port.flags = UPF_IOREMAP | UPF_SKIP_TEST;
|
|
uart.port.dev = &pdev->dev;
|
|
uart.port.uartclk = clk_get_rate(data->clk);
|
|
uart.port.pm = serial_pxa_pm;
|
|
uart.port.private_data = data;
|
|
uart.dl_write = serial_pxa_dl_write;
|
|
|
|
ret = serial8250_register_8250_port(&uart);
|
|
if (ret < 0)
|
|
goto err_clk;
|
|
|
|
data->line = ret;
|
|
|
|
platform_set_drvdata(pdev, data);
|
|
|
|
return 0;
|
|
|
|
err_clk:
|
|
clk_unprepare(data->clk);
|
|
return ret;
|
|
}
|
|
|
|
static int serial_pxa_remove(struct platform_device *pdev)
|
|
{
|
|
struct pxa8250_data *data = platform_get_drvdata(pdev);
|
|
|
|
serial8250_unregister_port(data->line);
|
|
|
|
clk_unprepare(data->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver serial_pxa_driver = {
|
|
.probe = serial_pxa_probe,
|
|
.remove = serial_pxa_remove,
|
|
|
|
.driver = {
|
|
.name = "pxa2xx-uart",
|
|
.pm = &serial_pxa_pm_ops,
|
|
.of_match_table = serial_pxa_dt_ids,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(serial_pxa_driver);
|
|
|
|
#ifdef CONFIG_SERIAL_8250_CONSOLE
|
|
static int __init early_serial_pxa_setup(struct earlycon_device *device,
|
|
const char *options)
|
|
{
|
|
struct uart_port *port = &device->port;
|
|
|
|
if (!(device->port.membase || device->port.iobase))
|
|
return -ENODEV;
|
|
|
|
port->regshift = 2;
|
|
return early_serial8250_setup(device, NULL);
|
|
}
|
|
OF_EARLYCON_DECLARE(early_pxa, "mrvl,pxa-uart", early_serial_pxa_setup);
|
|
#endif
|
|
|
|
MODULE_AUTHOR("Sergei Ianovich");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:pxa2xx-uart");
|