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Alchemy: Add UART PM methods.

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Custom UART PM hook for Alchemy chips:  do standard UART pm and
additionally en/disable uart block clocks as needed.
This allows to get rid of a debug port PM hack in the Alchemy pm code.

Tested on Db1200.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Manuel Lauss
2010-09-25 15:13:46 +02:00
committed by Greg Kroah-Hartman
parent c161afe975
commit 7d172bfefb
2 changed files with 28 additions and 35 deletions
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28
arch/mips/alchemy/common/platform.c
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@@ -24,6 +24,33 @@
#include <prom.h>
static void alchemy_8250_pm(struct uart_port *port, unsigned int state,
unsigned int old_state)
{
switch (state) {
case 0:
if ((__raw_readl(port->membase + UART_MOD_CNTRL) & 3) != 3) {
/* power-on sequence as suggested in the databooks */
__raw_writel(0, port->membase + UART_MOD_CNTRL);
wmb();
__raw_writel(1, port->membase + UART_MOD_CNTRL);
wmb();
}
__raw_writel(3, port->membase + UART_MOD_CNTRL); /* full on */
wmb();
serial8250_do_pm(port, state, old_state);
break;
case 3: /* power off */
serial8250_do_pm(port, state, old_state);
__raw_writel(0, port->membase + UART_MOD_CNTRL);
wmb();
break;
default:
serial8250_do_pm(port, state, old_state);
break;
}
}
#define PORT(_base, _irq) \
{ \
.mapbase = _base, \
@@ -33,6 +60,7 @@
.flags = UPF_SKIP_TEST | UPF_IOREMAP | \
UPF_FIXED_TYPE, \
.type = PORT_16550A, \
.pm = alchemy_8250_pm, \
}
static struct plat_serial8250_port au1x00_uart_data[] = {