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powerpc/85xx: Add lbc suspend support for PM 

Power supply for LBC registers is off when system go to deep-sleep state.
We save the values of registers before suspend and restore to registers
after resume.

We removed the last two reservation arrays from struct fsl_lbc_regs for
allocating less memory and minimizing the memcpy size.

Signed-off-by: Jiang Yutang <b14898@freescale.com>
Signed-off-by: Jia Hongtao <B38951@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Jia Hongtao 2011-11-21 14:29:11 +08:00 committed by Kumar Gala
parent 05737c7c5b
commit 09cef8bd07
2 changed files with 41 additions and 2 deletions
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7
arch/powerpc/include/asm/fsl_lbc.h
View File

@ -238,8 +238,6 @@ struct fsl_lbc_regs {
#define FPAR_LP_CI_SHIFT 0
__be32 fbcr; /**< Flash Byte Count Register */
#define FBCR_BC 0x00000FFF
u8 res11[0x8];
u8 res8[0xF00];
};
/*
@ -294,6 +292,11 @@ struct fsl_lbc_ctrl {
/* status read from LTESR by irq handler */
unsigned int irq_status;
#ifdef CONFIG_SUSPEND
/* save regs when system go to deep-sleep */
struct fsl_lbc_regs *saved_regs;
#endif
};
extern int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base,

36
arch/powerpc/sysdev/fsl_lbc.c
View File

@ -332,6 +332,38 @@ err:
return ret;
}
#ifdef CONFIG_SUSPEND
/* save lbc registers */
static int fsl_lbc_suspend(struct platform_device *pdev, pm_message_t state)
{
struct fsl_lbc_ctrl *ctrl = dev_get_drvdata(&pdev->dev);
struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
ctrl->saved_regs = kmalloc(sizeof(struct fsl_lbc_regs), GFP_KERNEL);
if (!ctrl->saved_regs)
return -ENOMEM;
_memcpy_fromio(ctrl->saved_regs, lbc, sizeof(struct fsl_lbc_regs));
return 0;
}
/* restore lbc registers */
static int fsl_lbc_resume(struct platform_device *pdev)
{
struct fsl_lbc_ctrl *ctrl = dev_get_drvdata(&pdev->dev);
struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
if (ctrl->saved_regs) {
_memcpy_toio(lbc, ctrl->saved_regs,
sizeof(struct fsl_lbc_regs));
kfree(ctrl->saved_regs);
ctrl->saved_regs = NULL;
}
return 0;
}
#endif /* CONFIG_SUSPEND */
static const struct of_device_id fsl_lbc_match[] = {
{ .compatible = "fsl,elbc", },
{ .compatible = "fsl,pq3-localbus", },
@ -346,6 +378,10 @@ static struct platform_driver fsl_lbc_ctrl_driver = {
.of_match_table = fsl_lbc_match,
},
.probe = fsl_lbc_ctrl_probe,
#ifdef CONFIG_SUSPEND
.suspend = fsl_lbc_suspend,
.resume = fsl_lbc_resume,
#endif
};
static int __init fsl_lbc_init(void)