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spi: spi-fsl-dspi: Adding shutdown hook 

[ Upstream commit dc23482599 ]

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: Peng Ma <peng.ma@nxp.com>
Link: https://lore.kernel.org/r/20200424061216.27445-1-peng.ma@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Peng Ma 2020-04-24 14:12:16 +08:00 committed by Greg Kroah-Hartman
parent eb676bef02
commit 6b64220baf
1 changed files with 23 additions and 0 deletions
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23
drivers/spi/spi-fsl-dspi.c
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@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0+
//
// Copyright 2013 Freescale Semiconductor, Inc.
// Copyright 2020 NXP
//
// Freescale DSPI driver
// This file contains a driver for the Freescale DSPI
@ -33,6 +34,9 @@
#define SPI_MCR_CLR_TXF BIT(11)
#define SPI_MCR_CLR_RXF BIT(10)
#define SPI_MCR_XSPI BIT(3)
#define SPI_MCR_DIS_TXF BIT(13)
#define SPI_MCR_DIS_RXF BIT(12)
#define SPI_MCR_HALT BIT(0)
#define SPI_TCR 0x08
#define SPI_TCR_GET_TCNT(x) (((x) & GENMASK(31, 16)) >> 16)
@ -1169,6 +1173,24 @@ 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->ctlr);
}
static struct platform_driver fsl_dspi_driver = {
.driver.name = DRIVER_NAME,
.driver.of_match_table = fsl_dspi_dt_ids,
@ -1176,6 +1198,7 @@ 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);