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serial: sirf: only use lookup table to set baudrate when ioclk=150MHz

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The fast lookup table to set baudrate is only right when ioclk
is 150MHz. for most platforms, ioclk is 150MHz, but some boards
might set ioclk to other frequency.

so re-calc the clk_div_reg when ioclk is not 150MHz. this patch
also gets clk in probe and puts it in remove.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Barry Song 2013-01-16 14:49:27 +08:00 committed by Greg Kroah-Hartman
parent e27a7d7977
commit ac4ce71889
2 changed files with 22 additions and 7 deletions
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28
drivers/tty/serial/sirfsoc_uart.c
View File

@ -357,7 +357,6 @@ static void sirfsoc_uart_set_termios(struct uart_port *port,
struct ktermios *old)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
unsigned long ioclk_rate;
unsigned long config_reg = 0;
unsigned long baud_rate;
unsigned long setted_baud;
@ -369,7 +368,6 @@ static void sirfsoc_uart_set_termios(struct uart_port *port,
int threshold_div;
int temp;
ioclk_rate = 150000000;
switch (termios->c_cflag & CSIZE) {
default:
case CS8:
@ -425,14 +423,17 @@ static void sirfsoc_uart_set_termios(struct uart_port *port,
sirfsoc_uart_disable_ms(port);
}
/* common rate: fast calculation */
for (ic = 0; ic < SIRF_BAUD_RATE_SUPPORT_NR; ic++)
if (baud_rate == baudrate_to_regv[ic].baud_rate)
clk_div_reg = baudrate_to_regv[ic].reg_val;
if (port->uartclk == 150000000) {
/* common rate: fast calculation */
for (ic = 0; ic < SIRF_BAUD_RATE_SUPPORT_NR; ic++)
if (baud_rate == baudrate_to_regv[ic].baud_rate)
clk_div_reg = baudrate_to_regv[ic].reg_val;
}
setted_baud = baud_rate;
/* arbitary rate setting */
if (unlikely(clk_div_reg == 0))
clk_div_reg = sirfsoc_calc_sample_div(baud_rate, ioclk_rate,
clk_div_reg = sirfsoc_calc_sample_div(baud_rate, port->uartclk,
&setted_baud);
wr_regl(port, SIRFUART_DIVISOR, clk_div_reg);
@ -691,6 +692,14 @@ int sirfsoc_uart_probe(struct platform_device *pdev)
goto err;
}
sirfport->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(sirfport->clk)) {
ret = PTR_ERR(sirfport->clk);
goto clk_err;
}
clk_prepare_enable(sirfport->clk);
port->uartclk = clk_get_rate(sirfport->clk);
port->ops = &sirfsoc_uart_ops;
spin_lock_init(&port->lock);
@ -704,6 +713,9 @@ int sirfsoc_uart_probe(struct platform_device *pdev)
return 0;
port_err:
clk_disable_unprepare(sirfport->clk);
clk_put(sirfport->clk);
clk_err:
platform_set_drvdata(pdev, NULL);
if (sirfport->hw_flow_ctrl)
pinctrl_put(sirfport->p);
@ -718,6 +730,8 @@ static int sirfsoc_uart_remove(struct platform_device *pdev)
platform_set_drvdata(pdev, NULL);
if (sirfport->hw_flow_ctrl)
pinctrl_put(sirfport->p);
clk_disable_unprepare(sirfport->clk);
clk_put(sirfport->clk);
uart_remove_one_port(&sirfsoc_uart_drv, port);
return 0;
}

1
drivers/tty/serial/sirfsoc_uart.h
View File

@ -163,6 +163,7 @@ struct sirfsoc_uart_port {
struct uart_port port;
struct pinctrl *p;
struct clk *clk;
};
/* Hardware Flow Control */