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Subject[PATCH v3] ata: add Amiga Gayle PATA controller driver
Date
Add Amiga Gayle PATA controller driver. It enables libata support
for the on-board IDE interfaces on some Amiga models (A600, A1200,
A4000 and A4000T) and also for IDE interfaces on the Zorro expansion
bus (M-Tech E-Matrix 530 expansion card).

Thanks to John Paul Adrian Glaubitz and Michael Schmitz for help
with testing the driver.

Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Michael Schmitz <schmitzmic@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
v3:
- fix minor issues reported by Andy

v2:
- clarify license version (it should be GPL 2.0)
- use SPDX header

drivers/ata/Kconfig | 12 ++
drivers/ata/Makefile | 1
drivers/ata/pata_gayle.c | 219 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 232 insertions(+)

Index: b/drivers/ata/Kconfig
===================================================================
--- a/drivers/ata/Kconfig 2018-03-16 17:01:47.051581322 +0100
+++ b/drivers/ata/Kconfig 2018-03-16 17:01:47.027581322 +0100
@@ -954,6 +954,18 @@ config PATA_FALCON

If unsure, say N.

+config PATA_GAYLE
+ tristate "Amiga Gayle PATA support"
+ depends on M68K && AMIGA
+ help
+ This option enables support for the on-board IDE
+ interfaces on some Amiga models (A600, A1200,
+ A4000 and A4000T) and also for IDE interfaces on
+ the Zorro expansion bus (M-Tech E-Matrix 530
+ expansion card).
+
+ If unsure, say N.
+
config PATA_ISAPNP
tristate "ISA Plug and Play PATA support"
depends on ISAPNP
Index: b/drivers/ata/Makefile
===================================================================
--- a/drivers/ata/Makefile 2018-03-16 17:01:47.051581322 +0100
+++ b/drivers/ata/Makefile 2018-03-16 17:01:47.035581322 +0100
@@ -97,6 +97,7 @@ obj-$(CONFIG_PATA_WINBOND) += pata_sl82c
# SFF PIO only
obj-$(CONFIG_PATA_CMD640_PCI) += pata_cmd640.o
obj-$(CONFIG_PATA_FALCON) += pata_falcon.o
+obj-$(CONFIG_PATA_GAYLE) += pata_gayle.o
obj-$(CONFIG_PATA_ISAPNP) += pata_isapnp.o
obj-$(CONFIG_PATA_IXP4XX_CF) += pata_ixp4xx_cf.o
obj-$(CONFIG_PATA_MPIIX) += pata_mpiix.o
Index: b/drivers/ata/pata_gayle.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ b/drivers/ata/pata_gayle.c 2018-03-16 17:05:31.972718374 +0100
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Amiga Gayle PATA controller driver
+ *
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Based on gayle.c:
+ *
+ * Created 12 Jul 1997 by Geert Uytterhoeven
+ */
+
+#include <linux/ata.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/libata.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/zorro.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+#include <asm/amigayle.h>
+#include <asm/ide.h>
+#include <asm/setup.h>
+
+#define DRV_NAME "pata_gayle"
+#define DRV_VERSION "0.1.0"
+
+#define GAYLE_CONTROL 0x101a
+
+static struct scsi_host_template pata_gayle_sht = {
+ ATA_PIO_SHT(DRV_NAME),
+};
+
+/* FIXME: is this needed? */
+static unsigned int pata_gayle_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;
+
+ /* Transfer multiple of 2 bytes */
+ if (rw == READ)
+ raw_insw((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) {
+ raw_insw((u16 *)data_addr, (u16 *)pad, 1);
+ *buf = pad[0];
+ } else {
+ pad[0] = *buf;
+ 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_gayle_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 bool pata_gayle_irq_check(struct ata_port *ap)
+{
+ u8 ch;
+
+ ch = z_readb((unsigned long)ap->private_data);
+
+ return !!(ch & GAYLE_IRQ_IDE);
+}
+
+static void pata_gayle_irq_clear(struct ata_port *ap)
+{
+ (void)z_readb((unsigned long)ap->ioaddr.status_addr);
+ z_writeb(0x7c, (unsigned long)ap->private_data);
+}
+
+static struct ata_port_operations pata_gayle_a1200_ops = {
+ .inherits = &ata_sff_port_ops,
+ .sff_data_xfer = pata_gayle_data_xfer,
+ .sff_irq_check = pata_gayle_irq_check,
+ .sff_irq_clear = pata_gayle_irq_clear,
+ .cable_detect = ata_cable_unknown,
+ .set_mode = pata_gayle_set_mode,
+};
+
+static struct ata_port_operations pata_gayle_a4000_ops = {
+ .inherits = &ata_sff_port_ops,
+ .sff_data_xfer = pata_gayle_data_xfer,
+ .cable_detect = ata_cable_unknown,
+ .set_mode = pata_gayle_set_mode,
+};
+
+static int __init pata_gayle_init_one(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct gayle_ide_platform_data *pdata;
+ struct ata_host *host;
+ struct ata_port *ap;
+ void __iomem *base;
+ int ret;
+
+ pdata = dev_get_platdata(&pdev->dev);
+
+ dev_info(&pdev->dev, "Amiga Gayle IDE controller (A%u style)\n",
+ pdata->explicit_ack ? 1200 : 4000);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ if (!devm_request_mem_region(&pdev->dev, res->start,
+ resource_size(res), 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];
+
+ if (pdata->explicit_ack)
+ ap->ops = &pata_gayle_a1200_ops;
+ else
+ ap->ops = &pata_gayle_a4000_ops;
+
+ ap->pio_mask = ATA_PIO4;
+ ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
+
+ base = ZTWO_VADDR(pdata->base);
+ ap->ioaddr.data_addr = base;
+ ap->ioaddr.error_addr = base + 2 + 1 * 4;
+ ap->ioaddr.feature_addr = base + 2 + 1 * 4;
+ ap->ioaddr.nsect_addr = base + 2 + 2 * 4;
+ ap->ioaddr.lbal_addr = base + 2 + 3 * 4;
+ ap->ioaddr.lbam_addr = base + 2 + 4 * 4;
+ ap->ioaddr.lbah_addr = base + 2 + 5 * 4;
+ ap->ioaddr.device_addr = base + 2 + 6 * 4;
+ ap->ioaddr.status_addr = base + 2 + 7 * 4;
+ ap->ioaddr.command_addr = base + 2 + 7 * 4;
+
+ ap->ioaddr.altstatus_addr = base + GAYLE_CONTROL;
+ ap->ioaddr.ctl_addr = base + GAYLE_CONTROL;
+
+ ap->private_data = (void *)ZTWO_VADDR(pdata->irqport);
+
+ ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", pdata->base,
+ pdata->base + GAYLE_CONTROL);
+
+ ret = ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,
+ IRQF_SHARED, &pata_gayle_sht);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, host);
+
+ return 0;
+}
+
+static int __exit pata_gayle_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_gayle_driver = {
+ .remove = __exit_p(pata_gayle_remove_one),
+ .driver = {
+ .name = "amiga-gayle-ide",
+ },
+};
+
+module_platform_driver_probe(pata_gayle_driver, pata_gayle_init_one);
+
+MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
+MODULE_DESCRIPTION("low-level driver for Amiga Gayle PATA");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:amiga-gayle-ide");
+MODULE_VERSION(DRV_VERSION);
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