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fbdev: sh_mobile_meram: Backup/restore device registers on shutdown/resume

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Save and reconfigure the MERAM registers when the MERAM is powered down
and restored

Signed-off-by: Damian Hobson-Garcia <dhobsong@igel.co.jp>
This commit is contained in:
Damian Hobson-Garcia 2011-06-22 07:49:51 +02:00 committed by Laurent Pinchart
parent 0aa492be88
commit 0b3bb77c3a
1 changed files with 71 additions and 0 deletions
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71
drivers/video/sh_mobile_meram.c
View file

@ -37,12 +37,31 @@
#define MEQSEL1 0x40
#define MEQSEL2 0x44
static unsigned long common_regs[] = {
MEVCR1,
MEQSEL1,
MEQSEL2,
};
#define CMN_REGS_SIZE ARRAY_SIZE(common_regs)
static unsigned long icb_regs[] = {
MExxCTL,
MExxBSIZE,
MExxMNCF,
MExxSARA,
MExxSARB,
MExxSBSIZE,
};
#define ICB_REGS_SIZE ARRAY_SIZE(icb_regs)
struct sh_mobile_meram_priv {
void __iomem *base;
struct mutex lock;
unsigned long used_icb;
int used_meram_cache_regions;
unsigned long used_meram_cache[SH_MOBILE_MERAM_ICB_NUM];
unsigned long cmn_saved_regs[CMN_REGS_SIZE];
unsigned long icb_saved_regs[ICB_REGS_SIZE * SH_MOBILE_MERAM_ICB_NUM];
};
/* settings */
@ -469,6 +488,57 @@ static int sh_mobile_meram_update(struct sh_mobile_meram_info *pdata,
return 0;
}
static int sh_mobile_meram_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
int k, j;
for (k = 0; k < CMN_REGS_SIZE; k++)
priv->cmn_saved_regs[k] = meram_read_reg(priv->base,
common_regs[k]);
for (j = 0; j < 32; j++) {
if (!test_bit(j, &priv->used_icb))
continue;
for (k = 0; k < ICB_REGS_SIZE; k++) {
priv->icb_saved_regs[j * ICB_REGS_SIZE + k] =
meram_read_icb(priv->base, j, icb_regs[k]);
/* Reset ICB on resume */
if (icb_regs[k] == MExxCTL)
priv->icb_saved_regs[j * ICB_REGS_SIZE + k] =
0x70;
}
}
return 0;
}
static int sh_mobile_meram_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
int k, j;
for (j = 0; j < 32; j++) {
if (!test_bit(j, &priv->used_icb))
continue;
for (k = 0; k < ICB_REGS_SIZE; k++) {
meram_write_icb(priv->base, j, icb_regs[k],
priv->icb_saved_regs[j * ICB_REGS_SIZE + k]);
}
}
for (k = 0; k < CMN_REGS_SIZE; k++)
meram_write_reg(priv->base, common_regs[k],
priv->cmn_saved_regs[k]);
return 0;
}
static const struct dev_pm_ops sh_mobile_meram_dev_pm_ops = {
.runtime_suspend = sh_mobile_meram_runtime_suspend,
.runtime_resume = sh_mobile_meram_runtime_resume,
};
static struct sh_mobile_meram_ops sh_mobile_meram_ops = {
.module = THIS_MODULE,
.meram_register = sh_mobile_meram_register,
@ -557,6 +627,7 @@ static struct platform_driver sh_mobile_meram_driver = {
.driver = {
.name = "sh_mobile_meram",
.owner = THIS_MODULE,
.pm = &sh_mobile_meram_dev_pm_ops,
},
.probe = sh_mobile_meram_probe,
.remove = sh_mobile_meram_remove,