From dc234825997ec6ff05980ca9e2204f4ac3f8d695 Mon Sep 17 00:00:00 2001 From: Peng Ma Date: Fri, 24 Apr 2020 14:12:16 +0800 Subject: [PATCH] spi: spi-fsl-dspi: Adding shutdown hook 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 Link: https://lore.kernel.org/r/20200424061216.27445-1-peng.ma@nxp.com Signed-off-by: Mark Brown --- drivers/spi/spi-fsl-dspi.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index 50e41f66a2d7..685afdf9e807 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 @@ -26,6 +27,9 @@ #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) @@ -1417,6 +1421,24 @@ 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, @@ -1424,6 +1446,7 @@ 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);