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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
commit 7d172bfefb
2 changed files with 28 additions and 35 deletions
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28
arch/mips/alchemy/common/platform.c
View file

@ -24,6 +24,33 @@
#include <prom.h> #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) \ #define PORT(_base, _irq) \
{ \ { \
.mapbase = _base, \ .mapbase = _base, \
@ -33,6 +60,7 @@
.flags = UPF_SKIP_TEST | UPF_IOREMAP | \ .flags = UPF_SKIP_TEST | UPF_IOREMAP | \
UPF_FIXED_TYPE, \ UPF_FIXED_TYPE, \
.type = PORT_16550A, \ .type = PORT_16550A, \
.pm = alchemy_8250_pm, \
} }
static struct plat_serial8250_port au1x00_uart_data[] = { static struct plat_serial8250_port au1x00_uart_data[] = {

35
arch/mips/alchemy/common/power.c
View file

@ -49,11 +49,6 @@
* We only have to save/restore registers that aren't otherwise * We only have to save/restore registers that aren't otherwise
* done as part of a driver pm_* function. * done as part of a driver pm_* function.
*/ */
static unsigned int sleep_uart0_inten;
static unsigned int sleep_uart0_fifoctl;
static unsigned int sleep_uart0_linectl;
static unsigned int sleep_uart0_clkdiv;
static unsigned int sleep_uart0_enable;
static unsigned int sleep_usb[2]; static unsigned int sleep_usb[2];
static unsigned int sleep_sys_clocks[5]; static unsigned int sleep_sys_clocks[5];
static unsigned int sleep_sys_pinfunc; static unsigned int sleep_sys_pinfunc;
@ -62,22 +57,6 @@ static unsigned int sleep_static_memctlr[4][3];
static void save_core_regs(void) static void save_core_regs(void)
{ {
extern void save_au1xxx_intctl(void);
extern void pm_eth0_shutdown(void);
/*
* Do the serial ports.....these really should be a pm_*
* registered function by the driver......but of course the
* standard serial driver doesn't understand our Au1xxx
* unique registers.
*/
sleep_uart0_inten = au_readl(UART0_ADDR + UART_IER);
sleep_uart0_fifoctl = au_readl(UART0_ADDR + UART_FCR);
sleep_uart0_linectl = au_readl(UART0_ADDR + UART_LCR);
sleep_uart0_clkdiv = au_readl(UART0_ADDR + UART_CLK);
sleep_uart0_enable = au_readl(UART0_ADDR + UART_MOD_CNTRL);
au_sync();
#ifndef CONFIG_SOC_AU1200 #ifndef CONFIG_SOC_AU1200
/* Shutdown USB host/device. */ /* Shutdown USB host/device. */
sleep_usb[0] = au_readl(USB_HOST_CONFIG); sleep_usb[0] = au_readl(USB_HOST_CONFIG);
@ -175,20 +154,6 @@ static void restore_core_regs(void)
au_writel(sleep_static_memctlr[3][0], MEM_STCFG3); au_writel(sleep_static_memctlr[3][0], MEM_STCFG3);
au_writel(sleep_static_memctlr[3][1], MEM_STTIME3); au_writel(sleep_static_memctlr[3][1], MEM_STTIME3);
au_writel(sleep_static_memctlr[3][2], MEM_STADDR3); au_writel(sleep_static_memctlr[3][2], MEM_STADDR3);
/*
* Enable the UART if it was enabled before sleep.
* I guess I should define module control bits........
*/
if (sleep_uart0_enable & 0x02) {
au_writel(0, UART0_ADDR + UART_MOD_CNTRL); au_sync();
au_writel(1, UART0_ADDR + UART_MOD_CNTRL); au_sync();
au_writel(3, UART0_ADDR + UART_MOD_CNTRL); au_sync();
au_writel(sleep_uart0_inten, UART0_ADDR + UART_IER); au_sync();
au_writel(sleep_uart0_fifoctl, UART0_ADDR + UART_FCR); au_sync();
au_writel(sleep_uart0_linectl, UART0_ADDR + UART_LCR); au_sync();
au_writel(sleep_uart0_clkdiv, UART0_ADDR + UART_CLK); au_sync();
}
} }
void au_sleep(void) void au_sleep(void)