Commit 09cef8bd authored by Jia Hongtao's avatar Jia Hongtao Committed by Kumar Gala
Browse files

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: default avatarJiang Yutang <b14898@freescale.com>
Signed-off-by: default avatarJia Hongtao <B38951@freescale.com>
Signed-off-by: default avatarLi Yang <leoli@freescale.com>
Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
parent 05737c7c

arch/powerpc/include/asm/fsl_lbc.h

+5 −2
Original line number Diff line number Diff line
@@ -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,

arch/powerpc/sysdev/fsl_lbc.c

+36 −0
Original line number Diff line number Diff line
@@ -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)

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