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| author | Peng Ma <peng.ma@nxp.com> | 2020-04-24 09:12:16 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-16 09:17:20 +0300 |
| commit | a7bf14f156a2613bf4840c14a77c7e0bdad3f747 (patch) | |
| tree | 1a3472103b6b04779c72a1fecc102169ec0c920c | |
| parent | 34314cc6da6c6c405c2e91c570d54c4c4343573d (diff) | |
| download | linux-a7bf14f156a2613bf4840c14a77c7e0bdad3f747.tar.xz | |
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: 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>
| -rw-r--r-- | drivers/spi/spi-fsl-dspi.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index 3082e72e4f6c..9296bcbbd32c 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -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 @@ -43,6 +44,9 @@ #define SPI_MCR_CLR_TXF (1 << 11) #define SPI_MCR_CLR_RXF (1 << 10) #define SPI_MCR_XSPI (1 << 3) +#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) @@ -1140,6 +1144,24 @@ 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, @@ -1147,6 +1169,7 @@ 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); |