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Diffstat (limited to 'drivers/ata/pata_falcon.c')
-rw-r--r--drivers/ata/pata_falcon.c241
1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/ata/pata_falcon.c b/drivers/ata/pata_falcon.c
new file mode 100644
index 0000000000..0c2ae430f5
--- /dev/null
+++ b/drivers/ata/pata_falcon.c
@@ -0,0 +1,241 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * 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
+ */
+
+#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>
+
+#define DRV_NAME "pata_falcon"
+#define DRV_VERSION "0.1.0"
+
+static int pata_falcon_swap_mask;
+
+module_param_named(data_swab, pata_falcon_swap_mask, int, 0444);
+MODULE_PARM_DESC(data_swab, "Data byte swap enable/disable bitmap (0x1==drive1, 0x2==drive2, 0x4==drive3, 0x8==drive4, default==0)");
+
+static const 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 &&
+ !blk_rq_is_passthrough(scsi_cmd_to_rq(cmd)))
+ swap = (uintptr_t)ap->private_data & BIT(dev->devno);
+
+ /* Transfer multiple of 2 bytes */
+ if (rw == READ) {
+ if (swap)
+ raw_insw_swapw(data_addr, (u16 *)buf, words);
+ else
+ raw_insw(data_addr, (u16 *)buf, words);
+ } else {
+ if (swap)
+ raw_outsw_swapw(data_addr, (u16 *)buf, words);
+ else
+ raw_outsw(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(data_addr, (u16 *)pad, 1);
+ else
+ raw_insw(data_addr, (u16 *)pad, 1);
+ *buf = pad[0];
+ } else {
+ pad[0] = *buf;
+ if (swap)
+ raw_outsw_swapw(data_addr, (u16 *)pad, 1);
+ else
+ raw_outsw(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 __init pata_falcon_init_one(struct platform_device *pdev)
+{
+ struct resource *base_mem_res, *ctl_mem_res;
+ struct resource *base_res, *ctl_res, *irq_res;
+ struct ata_host *host;
+ struct ata_port *ap;
+ void __iomem *base, *ctl_base;
+ int mask_shift = 0; /* Q40 & Falcon default */
+ int irq = 0, io_offset = 1, reg_shift = 2; /* Falcon defaults */
+
+ dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n");
+
+ base_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (base_res && !devm_request_region(&pdev->dev, base_res->start,
+ resource_size(base_res), DRV_NAME)) {
+ dev_err(&pdev->dev, "resources busy\n");
+ return -EBUSY;
+ }
+
+ ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
+ if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start,
+ resource_size(ctl_res), DRV_NAME)) {
+ dev_err(&pdev->dev, "resources busy\n");
+ return -EBUSY;
+ }
+
+ base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!base_mem_res)
+ return -ENODEV;
+ if (!devm_request_mem_region(&pdev->dev, base_mem_res->start,
+ resource_size(base_mem_res), DRV_NAME)) {
+ dev_err(&pdev->dev, "resources busy\n");
+ return -EBUSY;
+ }
+
+ ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!ctl_mem_res)
+ return -ENODEV;
+
+ /* 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;
+
+ /* N.B. this assumes data_addr will be used for word-sized I/O only */
+ ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start;
+
+ if (base_res) { /* only Q40 has IO resources */
+ io_offset = 0x10000;
+ reg_shift = 0;
+ base = (void __iomem *)base_res->start;
+ ctl_base = (void __iomem *)ctl_res->start;
+ } else {
+ base = (void __iomem *)base_mem_res->start;
+ ctl_base = (void __iomem *)ctl_mem_res->start;
+ }
+
+ ap->ioaddr.error_addr = base + io_offset + (1 << reg_shift);
+ ap->ioaddr.feature_addr = base + io_offset + (1 << reg_shift);
+ ap->ioaddr.nsect_addr = base + io_offset + (2 << reg_shift);
+ ap->ioaddr.lbal_addr = base + io_offset + (3 << reg_shift);
+ ap->ioaddr.lbam_addr = base + io_offset + (4 << reg_shift);
+ ap->ioaddr.lbah_addr = base + io_offset + (5 << reg_shift);
+ ap->ioaddr.device_addr = base + io_offset + (6 << reg_shift);
+ ap->ioaddr.status_addr = base + io_offset + (7 << reg_shift);
+ ap->ioaddr.command_addr = base + io_offset + (7 << reg_shift);
+
+ ap->ioaddr.altstatus_addr = ctl_base + io_offset;
+ ap->ioaddr.ctl_addr = ctl_base + io_offset;
+
+ ata_port_desc(ap, "cmd %px ctl %px data %px",
+ base, ctl_base, ap->ioaddr.data_addr);
+
+ if (pdev->id > 0)
+ mask_shift = 2;
+ ap->private_data = (void *)(uintptr_t)(pata_falcon_swap_mask >> mask_shift);
+
+ irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (irq_res && irq_res->start > 0) {
+ irq = irq_res->start;
+ } else {
+ ap->flags |= ATA_FLAG_PIO_POLLING;
+ ata_port_desc(ap, "no IRQ, using PIO polling");
+ }
+
+ /* activate */
+ return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
+ IRQF_SHARED, &pata_falcon_sht);
+}
+
+static int __exit pata_falcon_remove_one(struct platform_device *pdev)
+{
+ struct ata_host *host = platform_get_drvdata(pdev);
+
+ ata_host_detach(host);
+
+ return 0;
+}
+
+static struct platform_driver pata_falcon_driver = {
+ .remove = __exit_p(pata_falcon_remove_one),
+ .driver = {
+ .name = "atari-falcon-ide",
+ },
+};
+
+module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one);
+
+MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
+MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:atari-falcon-ide");
+MODULE_VERSION(DRV_VERSION);