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ARM: sa11x0: neponset: save and restore MDM_CTL_0

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Save and restore the modem output control register across a suspend/
resume, as well as the NCR register.  Place these in a locally
allocated data structure rather than needing a new static variable.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2012-01-24 22:10:02 +00:00
parent 398e58d09d
commit ae14c2e28c
1 changed files with 43 additions and 12 deletions
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55
arch/arm/mach-sa1100/neponset.c
View file

@ -1,12 +1,13 @@
/*
* linux/arch/arm/mach-sa1100/neponset.c
*
*/
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/serial_core.h>
#include <linux/slab.h>
#include <asm/mach-types.h>
#include <asm/irq.h>
@ -20,6 +21,13 @@
#include <mach/assabet.h>
#include <mach/neponset.h>
struct neponset_drvdata {
#ifdef CONFIG_PM_SLEEP
u32 ncr0;
u32 mdm_ctl_0;
#endif
};
void neponset_ncr_frob(unsigned int mask, unsigned int val)
{
unsigned long flags;
@ -200,6 +208,15 @@ static struct platform_device smc91x_device = {
static int __devinit neponset_probe(struct platform_device *dev)
{
struct neponset_drvdata *d;
int ret;
d = kzalloc(sizeof(*d), GFP_KERNEL);
if (!d) {
ret = -ENOMEM;
goto err_alloc;
}
sa1100_register_uart_fns(&neponset_port_fns);
/*
@ -234,29 +251,42 @@ static int __devinit neponset_probe(struct platform_device *dev)
*/
NCR_0 = NCR_GP01_OFF;
platform_set_drvdata(dev, d);
return 0;
err_alloc:
return ret;
}
static int __devexit neponset_remove(struct platform_device *dev)
{
struct neponset_drvdata *d = platform_get_drvdata(dev);
irq_set_chained_handler(IRQ_GPIO25, NULL);
kfree(d);
return 0;
}
#ifdef CONFIG_PM
/*
* LDM power management.
*/
static unsigned int neponset_saved_state;
static int neponset_suspend(struct platform_device *dev, pm_message_t state)
{
/*
* Save state.
*/
neponset_saved_state = NCR_0;
struct neponset_drvdata *d = platform_get_drvdata(dev);
d->ncr0 = NCR_0;
d->mdm_ctl_0 = MDM_CTL_0;
return 0;
}
static int neponset_resume(struct platform_device *dev)
{
NCR_0 = neponset_saved_state;
struct neponset_drvdata *d = platform_get_drvdata(dev);
NCR_0 = d->ncr0;
MDM_CTL_0 = d->mdm_ctl_0;
return 0;
}
@ -268,6 +298,7 @@ static int neponset_resume(struct platform_device *dev)
static struct platform_driver neponset_device_driver = {
.probe = neponset_probe,
.remove = __devexit_p(neponset_remove),
.suspend = neponset_suspend,
.resume = neponset_resume,
.driver = {