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-rw-r--r--drivers/ata/pata_falcon.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/ata/pata_falcon.c b/drivers/ata/pata_falcon.c
new file mode 100644
index 000000000000..5b0c57d1c59f
--- /dev/null
+++ b/drivers/ata/pata_falcon.c
@@ -0,0 +1,184 @@
+/*
+ * Atari Falcon PATA controller driver
+ *
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Based on falconide.c:
+ *
+ * Created 12 Jul 1997 by Geert Uytterhoeven
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+#include <linux/ata.h>
+#include <linux/libata.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#include <asm/setup.h>
+#include <asm/atarihw.h>
+#include <asm/atariints.h>
+#include <asm/atari_stdma.h>
+#include <asm/ide.h>
+
+#define DRV_NAME "pata_falcon"
+#define DRV_VERSION "0.1.0"
+
+#define ATA_HD_BASE 0xfff00000
+#define ATA_HD_CONTROL 0x39
+
+static struct scsi_host_template pata_falcon_sht = {
+ ATA_PIO_SHT(DRV_NAME),
+};
+
+static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
+ unsigned char *buf,
+ unsigned int buflen, int rw)
+{
+ struct ata_device *dev = qc->dev;
+ struct ata_port *ap = dev->link->ap;
+ void __iomem *data_addr = ap->ioaddr.data_addr;
+ unsigned int words = buflen >> 1;
+ struct scsi_cmnd *cmd = qc->scsicmd;
+ bool swap = 1;
+
+ if (dev->class == ATA_DEV_ATA && cmd && cmd->request &&
+ !blk_rq_is_passthrough(cmd->request))
+ swap = 0;
+
+ /* Transfer multiple of 2 bytes */
+ if (rw == READ) {
+ if (swap)
+ raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words);
+ else
+ raw_insw((u16 *)data_addr, (u16 *)buf, words);
+ } else {
+ if (swap)
+ raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words);
+ else
+ raw_outsw((u16 *)data_addr, (u16 *)buf, words);
+ }
+
+ /* Transfer trailing byte, if any. */
+ if (unlikely(buflen & 0x01)) {
+ unsigned char pad[2] = { };
+
+ /* Point buf to the tail of buffer */
+ buf += buflen - 1;
+
+ if (rw == READ) {
+ if (swap)
+ raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1);
+ else
+ raw_insw((u16 *)data_addr, (u16 *)pad, 1);
+ *buf = pad[0];
+ } else {
+ pad[0] = *buf;
+ if (swap)
+ raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1);
+ else
+ raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
+ }
+ words++;
+ }
+
+ return words << 1;
+}
+
+/*
+ * Provide our own set_mode() as we don't want to change anything that has
+ * already been configured..
+ */
+static int pata_falcon_set_mode(struct ata_link *link,
+ struct ata_device **unused)
+{
+ struct ata_device *dev;
+
+ ata_for_each_dev(dev, link, ENABLED) {
+ /* We don't really care */
+ dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
+ dev->xfer_shift = ATA_SHIFT_PIO;
+ dev->flags |= ATA_DFLAG_PIO;
+ ata_dev_info(dev, "configured for PIO\n");
+ }
+ return 0;
+}
+
+static struct ata_port_operations pata_falcon_ops = {
+ .inherits = &ata_sff_port_ops,
+ .sff_data_xfer = pata_falcon_data_xfer,
+ .cable_detect = ata_cable_unknown,
+ .set_mode = pata_falcon_set_mode,
+};
+
+static int pata_falcon_init_one(void)
+{
+ struct ata_host *host;
+ struct ata_port *ap;
+ struct platform_device *pdev;
+ void __iomem *base;
+
+ if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
+ return -ENODEV;
+
+ pr_info(DRV_NAME ": Atari Falcon PATA controller\n");
+
+ pdev = platform_device_register_simple(DRV_NAME, 0, NULL, 0);
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ if (!devm_request_mem_region(&pdev->dev, ATA_HD_BASE, 0x40, DRV_NAME)) {
+ pr_err(DRV_NAME ": resources busy\n");
+ return -EBUSY;
+ }
+
+ /* allocate host */
+ host = ata_host_alloc(&pdev->dev, 1);
+ if (!host)
+ return -ENOMEM;
+ ap = host->ports[0];
+
+ ap->ops = &pata_falcon_ops;
+ ap->pio_mask = ATA_PIO4;
+ ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
+ ap->flags |= ATA_FLAG_PIO_POLLING;
+
+ base = (void __iomem *)ATA_HD_BASE;
+ ap->ioaddr.data_addr = base;
+ ap->ioaddr.error_addr = base + 1 + 1 * 4;
+ ap->ioaddr.feature_addr = base + 1 + 1 * 4;
+ ap->ioaddr.nsect_addr = base + 1 + 2 * 4;
+ ap->ioaddr.lbal_addr = base + 1 + 3 * 4;
+ ap->ioaddr.lbam_addr = base + 1 + 4 * 4;
+ ap->ioaddr.lbah_addr = base + 1 + 5 * 4;
+ ap->ioaddr.device_addr = base + 1 + 6 * 4;
+ ap->ioaddr.status_addr = base + 1 + 7 * 4;
+ ap->ioaddr.command_addr = base + 1 + 7 * 4;
+
+ ap->ioaddr.altstatus_addr = base + ATA_HD_CONTROL;
+ ap->ioaddr.ctl_addr = base + ATA_HD_CONTROL;
+
+ ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base,
+ (unsigned long)base + ATA_HD_CONTROL);
+
+ /* activate */
+ return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht);
+}
+
+module_init(pata_falcon_init_one);
+
+MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
+MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);

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