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Commit 99ec7ac5 authored by Peng Ma's avatar Peng Ma Committed by Greg Kroah-Hartman
Browse files

spi: spi-fsl-dspi: Adding shutdown hook 



[ Upstream commit dc234825997ec6ff05980ca9e2204f4ac3f8d695 ]

We need to ensure dspi controller could be stopped in order for kexec
to start the next kernel.
So add the shutdown operation support.

Signed-off-by: default avatarPeng Ma <peng.ma@nxp.com>
Link: https://lore.kernel.org/r/20200424061216.27445-1-peng.ma@nxp.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 6de7d76d

drivers/spi/spi-fsl-dspi.c

+22 −0
Original line number Diff line number Diff line
@@ -49,6 +49,9 @@ 
#define SPI_MCR_PCSIS		(0x3F << 16)

#define SPI_MCR_CLR_TXF	(1 << 11)

#define SPI_MCR_CLR_RXF	(1 << 10)

#define SPI_MCR_DIS_TXF		(1 << 13)

#define SPI_MCR_DIS_RXF		(1 << 12)

#define SPI_MCR_HALT		(1 << 0)



#define SPI_TCR			0x08

#define SPI_TCR_GET_TCNT(x)	(((x) & 0xffff0000) >> 16)
@@ -1074,6 +1077,24 @@ static int dspi_remove(struct platform_device *pdev) 
	return 0;

}



static void dspi_shutdown(struct platform_device *pdev)

{

	struct spi_controller *ctlr = platform_get_drvdata(pdev);

	struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr);



	/* Disable RX and TX */

	regmap_update_bits(dspi->regmap, SPI_MCR,

			   SPI_MCR_DIS_TXF | SPI_MCR_DIS_RXF,

			   SPI_MCR_DIS_TXF | SPI_MCR_DIS_RXF);



	/* Stop Running */

	regmap_update_bits(dspi->regmap, SPI_MCR, SPI_MCR_HALT, SPI_MCR_HALT);



	dspi_release_dma(dspi);

	clk_disable_unprepare(dspi->clk);

	spi_unregister_controller(dspi->master);

}



static struct platform_driver fsl_dspi_driver = {

	.driver.name    = DRIVER_NAME,

	.driver.of_match_table = fsl_dspi_dt_ids,
@@ -1081,6 +1102,7 @@ static struct platform_driver fsl_dspi_driver = { 
	.driver.pm = &dspi_pm,

	.probe          = dspi_probe,

	.remove		= dspi_remove,

	.shutdown	= dspi_shutdown,

};

module_platform_driver(fsl_dspi_driver);