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update serial for poll read and write

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This commit is contained in:
林辉辉
2010-05-14 09:57:38 +00:00
committed by 黄涛
parent bd5f792551
commit a2b2664c64
1 changed files with 29 additions and 2 deletions
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31
drivers/serial/rk2818_serial.c
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@@ -436,6 +436,26 @@ static int rk2818_serial_verify_port(struct uart_port *port, struct serial_struc
return ret;
}
#ifdef CONFIG_CONSOLE_POLL
/*
* Console polling routines for writing and reading from the uart while
* in an interrupt or debug context.
*/
static int rk2818_serial_poll_get_char(struct uart_port *port)
{
while (!((rk2818_uart_read(port, UART_USR) & UART_RECEIVE_FIFO_NOT_EMPTY) == UART_RECEIVE_FIFO_NOT_EMPTY))
barrier();
return rk2818_uart_read(port, UART_RBR);
}
static void rk2818_serial_poll_put_char(struct uart_port *port, unsigned char c)
{
while (!(rk2818_uart_read(port, UART_USR) & UART_TRANSMIT_FIFO_NOT_FULL))
barrier();
rk2818_uart_write(port, c, UART_THR);
}
#endif /* CONFIG_CONSOLE_POLL */
static struct uart_ops rk2818_uart_pops = {
.tx_empty = rk2818_serial_tx_empty,
@@ -455,6 +475,10 @@ static struct uart_ops rk2818_uart_pops = {
.config_port = rk2818_serial_config_port,
.verify_port = rk2818_serial_verify_port,
.pm = rk2818_serial_pm,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = rk2818_serial_poll_get_char,
.poll_put_char = rk2818_serial_poll_put_char,
#endif
};
@@ -667,8 +691,11 @@ static void __exit rk2818_serial_exit(void)
uart_unregister_driver(&rk2818_uart_driver);
}
module_init(rk2818_serial_init);
/*
* While this can be a module, if builtin it's most likely the console
* So let's leave module_exit but move module_init to an earlier place
*/
arch_initcall(rk2818_serial_init);
module_exit(rk2818_serial_exit);
MODULE_AUTHOR("lhh lhh@rock-chips.com");