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Commit e275ed5e authored by Manuel Lauss's avatar Manuel Lauss Committed by Ralf Baechle
Browse files

MIPS: Alchemy: devboard PM needs to save CPLD registers. 



Save/restore CPLD registers when doing suspend-to-ram; this fixes issues
with harddisk and ethernet not working correctly when resuming on DB1200.

Signed-off-by: default avatarManuel Lauss <manuel.lauss@gmail.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: http://patchwork.linux-mips.org/patch/986/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 81fc0179

arch/mips/alchemy/devboards/pm.c

+32 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/sysfs.h>

#include <asm/mach-au1x00/au1000.h>

#include <asm/mach-au1x00/gpio.h>

#include <asm/mach-db1x00/bcsr.h>



/*

 * Generic suspend userspace interface for Alchemy development boards.
@@ -26,6 +27,20 @@ static unsigned long db1x_pm_last_wakesrc; 


static int db1x_pm_enter(suspend_state_t state)

{

	unsigned short bcsrs[16];

	int i, j, hasint;



	/* save CPLD regs */

	hasint = bcsr_read(BCSR_WHOAMI);

	hasint = BCSR_WHOAMI_BOARD(hasint) >= BCSR_WHOAMI_DB1200;

	j = (hasint) ? BCSR_MASKSET : BCSR_SYSTEM;



	for (i = BCSR_STATUS; i <= j; i++)

		bcsrs[i] = bcsr_read(i);



	/* shut off hexleds */

	bcsr_write(BCSR_HEXCLEAR, 3);



	/* enable GPIO based wakeup */

	alchemy_gpio1_input_enable();
@@ -52,6 +67,23 @@ static int db1x_pm_enter(suspend_state_t state) 
	/* ...and now the sandman can come! */

	au_sleep();





	/* restore CPLD regs */

	for (i = BCSR_STATUS; i <= BCSR_SYSTEM; i++)

		bcsr_write(i, bcsrs[i]);



	/* restore CPLD int registers */

	if (hasint) {

		bcsr_write(BCSR_INTCLR, 0xffff);

		bcsr_write(BCSR_MASKCLR, 0xffff);

		bcsr_write(BCSR_INTSTAT, 0xffff);

		bcsr_write(BCSR_INTSET, bcsrs[BCSR_INTSET]);

		bcsr_write(BCSR_MASKSET, bcsrs[BCSR_MASKSET]);

	}



	/* light up hexleds */

	bcsr_write(BCSR_HEXCLEAR, 0);



	return 0;

}