linux/drivers/ata/pata_pxa.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Generic PXA PATA driver
 *
 * Copyright (C) 2010 Marek Vasut <[email protected]>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/slab.h>
#include <linux/completion.h>

#include <scsi/scsi_host.h>

#include <linux/platform_data/ata-pxa.h>

#define DRV_NAME …
#define DRV_VERSION …

struct pata_pxa_data { … };

/*
 * DMA interrupt handler.
 */
static void pxa_ata_dma_irq(void *d)
{ … }

/*
 * Prepare taskfile for submission.
 */
static enum ata_completion_errors pxa_qc_prep(struct ata_queued_cmd *qc)
{ … }

/*
 * Configure the DMA controller, load the DMA descriptors, but don't start the
 * DMA controller yet. Only issue the ATA command.
 */
static void pxa_bmdma_setup(struct ata_queued_cmd *qc)
{ … }

/*
 * Execute the DMA transfer.
 */
static void pxa_bmdma_start(struct ata_queued_cmd *qc)
{ … }

/*
 * Wait until the DMA transfer completes, then stop the DMA controller.
 */
static void pxa_bmdma_stop(struct ata_queued_cmd *qc)
{ … }

/*
 * Read DMA status. The bmdma_stop() will take care of properly finishing the
 * DMA transfer so we always have DMA-complete interrupt here.
 */
static unsigned char pxa_bmdma_status(struct ata_port *ap)
{ … }

/*
 * No IRQ register present so we do nothing.
 */
static void pxa_irq_clear(struct ata_port *ap)
{ … }

/*
 * Check for ATAPI DMA. ATAPI DMA is unsupported by this driver. It's still
 * unclear why ATAPI has DMA issues.
 */
static int pxa_check_atapi_dma(struct ata_queued_cmd *qc)
{ … }

static const struct scsi_host_template pxa_ata_sht = …;

static struct ata_port_operations pxa_ata_port_ops = …;

static int pxa_ata_probe(struct platform_device *pdev)
{ … }

static void pxa_ata_remove(struct platform_device *pdev)
{ … }

static struct platform_driver pxa_ata_driver = …;

module_platform_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;
MODULE_VERSION(…);
MODULE_ALIAS(…) …;