// SPDX-License-Identifier: GPL-2.0-or-later /* * Freescale SPI controller driver. * * Maintainer: Kumar Gala * * Copyright (C) 2006 Polycom, Inc. * Copyright 2010 Freescale Semiconductor, Inc. * * CPM SPI and QE buffer descriptors mode support: * Copyright (c) 2009 MontaVista Software, Inc. * Author: Anton Vorontsov <[email protected]> * * GRLIB support: * Copyright (c) 2012 Aeroflex Gaisler AB. * Author: Andreas Larsson <[email protected]> */ #include <linux/delay.h> #include <linux/dma-mapping.h> #include <linux/fsl_devices.h> #include <linux/gpio/consumer.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/spi/spi.h> #include <linux/spi/spi_bitbang.h> #include <linux/types.h> #ifdef CONFIG_FSL_SOC #include <sysdev/fsl_soc.h> #endif /* Specific to the MPC8306/MPC8309 */ #define IMMR_SPI_CS_OFFSET … #define SPI_BOOT_SEL_BIT … #include "spi-fsl-lib.h" #include "spi-fsl-cpm.h" #include "spi-fsl-spi.h" #define TYPE_FSL … #define TYPE_GRLIB … struct fsl_spi_match_data { … }; static struct fsl_spi_match_data of_fsl_spi_fsl_config = …; static struct fsl_spi_match_data of_fsl_spi_grlib_config = …; static const struct of_device_id of_fsl_spi_match[] = …; MODULE_DEVICE_TABLE(of, of_fsl_spi_match); static int fsl_spi_get_type(struct device *dev) { … } static void fsl_spi_change_mode(struct spi_device *spi) { … } static void fsl_spi_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift, int bits_per_word, int msb_first) { … } static void fsl_spi_grlib_set_shifts(u32 *rx_shift, u32 *tx_shift, int bits_per_word, int msb_first) { … } static void mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs, struct spi_device *spi, struct mpc8xxx_spi *mpc8xxx_spi, int bits_per_word) { … } static int fsl_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) { … } static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t, unsigned int len) { … } static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t) { … } static int fsl_spi_prepare_message(struct spi_controller *ctlr, struct spi_message *m) { … } static int fsl_spi_transfer_one(struct spi_controller *controller, struct spi_device *spi, struct spi_transfer *t) { … } static int fsl_spi_unprepare_message(struct spi_controller *controller, struct spi_message *msg) { … } static int fsl_spi_setup(struct spi_device *spi) { … } static void fsl_spi_cleanup(struct spi_device *spi) { … } static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) { … } static irqreturn_t fsl_spi_irq(s32 irq, void *context_data) { … } static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on) { … } static void fsl_spi_grlib_probe(struct device *dev) { … } static void fsl_spi_cs_control(struct spi_device *spi, bool on) { … } static struct spi_controller *fsl_spi_probe(struct device *dev, struct resource *mem, unsigned int irq) { … } static int of_fsl_spi_probe(struct platform_device *ofdev) { … } static void of_fsl_spi_remove(struct platform_device *ofdev) { … } static struct platform_driver of_fsl_spi_driver = …; #ifdef CONFIG_MPC832x_RDB /* * XXX XXX XXX * This is "legacy" platform driver, was used by the MPC8323E-RDB boards * only. The driver should go away soon, since newer MPC8323E-RDB's device * tree can work with OpenFirmware driver. But for now we support old trees * as well. */ static int plat_mpc8xxx_spi_probe(struct platform_device *pdev) { struct resource *mem; int irq; struct spi_controller *host; if (!dev_get_platdata(&pdev->dev)) return -EINVAL; mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!mem) return -EINVAL; irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; host = fsl_spi_probe(&pdev->dev, mem, irq); return PTR_ERR_OR_ZERO(host); } static void plat_mpc8xxx_spi_remove(struct platform_device *pdev) { struct spi_controller *host = platform_get_drvdata(pdev); struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(host); fsl_spi_cpm_free(mpc8xxx_spi); } MODULE_ALIAS("platform:mpc8xxx_spi"); static struct platform_driver mpc8xxx_spi_driver = { .probe = plat_mpc8xxx_spi_probe, .remove_new = plat_mpc8xxx_spi_remove, .driver = { .name = "mpc8xxx_spi", }, }; static bool legacy_driver_failed; static void __init legacy_driver_register(void) { legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver); } static void __exit legacy_driver_unregister(void) { if (legacy_driver_failed) return; platform_driver_unregister(&mpc8xxx_spi_driver); } #else static void __init legacy_driver_register(void) { … } static void __exit legacy_driver_unregister(void) { … } #endif /* CONFIG_MPC832x_RDB */ static int __init fsl_spi_init(void) { … } module_init(…) …; static void __exit fsl_spi_exit(void) { … } module_exit(fsl_spi_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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