1 files changed, 299 insertions, 0 deletions
diff --git a/drivers/ata/pata_buddha.c b/drivers/ata/pata_buddha.c
new file mode 100644
index 000000000..27d4c417f
--- /dev/null
+++ b/drivers/ata/pata_buddha.c
@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Buddha, Catweasel and X-Surf PATA controller driver
+ *
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Based on buddha.c:
+ *
+ *	Copyright (C) 1997, 2001 by Geert Uytterhoeven and others
+ */
+
+#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/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/types.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/ide.h>
+#include <asm/setup.h>
+
+#define DRV_NAME "pata_buddha"
+#define DRV_VERSION "0.1.1"
+
+#define BUDDHA_BASE1	0x800
+#define BUDDHA_BASE2	0xa00
+#define BUDDHA_BASE3	0xc00
+#define XSURF_BASE1	0xb000 /* 2.5" interface */
+#define XSURF_BASE2	0xd000 /* 3.5" interface */
+#define BUDDHA_CONTROL	0x11a
+#define BUDDHA_IRQ	0xf00
+#define XSURF_IRQ	0x7e
+#define BUDDHA_IRQ_MR	0xfc0	/* master interrupt enable */
+
+enum {
+	BOARD_BUDDHA = 0,
+	BOARD_CATWEASEL,
+	BOARD_XSURF
+};
+
+static unsigned int buddha_bases[3] = {
+	BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
+};
+
+static unsigned int xsurf_bases[2] = {
+	XSURF_BASE1, XSURF_BASE2
+};
+
+static struct scsi_host_template pata_buddha_sht = {
+	ATA_PIO_SHT(DRV_NAME),
+};
+
+/* FIXME: is this needed? */
+static unsigned int pata_buddha_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_buddha_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_buddha_irq_check(struct ata_port *ap)
+{
+	u8 ch;
+
+	ch = z_readb((unsigned long)ap->private_data);
+
+	return !!(ch & 0x80);
+}
+
+static void pata_xsurf_irq_clear(struct ata_port *ap)
+{
+	z_writeb(0, (unsigned long)ap->private_data);
+}
+
+static struct ata_port_operations pata_buddha_ops = {
+	.inherits	= &ata_sff_port_ops,
+	.sff_data_xfer	= pata_buddha_data_xfer,
+	.sff_irq_check	= pata_buddha_irq_check,
+	.cable_detect	= ata_cable_unknown,
+	.set_mode	= pata_buddha_set_mode,
+};
+
+static struct ata_port_operations pata_xsurf_ops = {
+	.inherits	= &ata_sff_port_ops,
+	.sff_data_xfer	= pata_buddha_data_xfer,
+	.sff_irq_check	= pata_buddha_irq_check,
+	.sff_irq_clear	= pata_xsurf_irq_clear,
+	.cable_detect	= ata_cable_unknown,
+	.set_mode	= pata_buddha_set_mode,
+};
+
+static int pata_buddha_probe(struct zorro_dev *z,
+			     const struct zorro_device_id *ent)
+{
+	static const char * const board_name[] = {
+		"Buddha", "Catweasel", "X-Surf"
+	};
+	struct ata_host *host;
+	void __iomem *buddha_board;
+	unsigned long board;
+	unsigned int type = ent->driver_data;
+	unsigned int nr_ports = (type == BOARD_CATWEASEL) ? 3 : 2;
+	void *old_drvdata;
+	int i;
+
+	dev_info(&z->dev, "%s IDE controller\n", board_name[type]);
+
+	board = z->resource.start;
+
+	if (type != BOARD_XSURF) {
+		if (!devm_request_mem_region(&z->dev,
+					     board + BUDDHA_BASE1,
+					     0x800, DRV_NAME))
+			return -ENXIO;
+	} else {
+		if (!devm_request_mem_region(&z->dev,
+					     board + XSURF_BASE1,
+					     0x1000, DRV_NAME))
+			return -ENXIO;
+		if (!devm_request_mem_region(&z->dev,
+					     board + XSURF_BASE2,
+					     0x1000, DRV_NAME)) {
+		}
+	}
+
+	/* Workaround for X-Surf: Save drvdata in case zorro8390 has set it */
+	if (type == BOARD_XSURF)
+		old_drvdata = dev_get_drvdata(&z->dev);
+
+	/* allocate host */
+	host = ata_host_alloc(&z->dev, nr_ports);
+	if (type == BOARD_XSURF)
+		dev_set_drvdata(&z->dev, old_drvdata);
+	if (!host)
+		return -ENXIO;
+
+	buddha_board = ZTWO_VADDR(board);
+
+	/* enable the board IRQ on Buddha/Catweasel */
+	if (type != BOARD_XSURF)
+		z_writeb(0, buddha_board + BUDDHA_IRQ_MR);
+
+	for (i = 0; i < nr_ports; i++) {
+		struct ata_port *ap = host->ports[i];
+		void __iomem *base, *irqport;
+		unsigned long ctl = 0;
+
+		if (type != BOARD_XSURF) {
+			ap->ops = &pata_buddha_ops;
+			base = buddha_board + buddha_bases[i];
+			ctl = BUDDHA_CONTROL;
+			irqport = buddha_board + BUDDHA_IRQ + i * 0x40;
+		} else {
+			ap->ops = &pata_xsurf_ops;
+			base = buddha_board + xsurf_bases[i];
+			/* X-Surf has no CS1* (Control/AltStat) */
+			irqport = buddha_board + XSURF_IRQ;
+		}
+
+		ap->pio_mask = ATA_PIO4;
+		ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
+
+		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;
+
+		if (ctl) {
+			ap->ioaddr.altstatus_addr = base + ctl;
+			ap->ioaddr.ctl_addr	  = base + ctl;
+		}
+
+		ap->private_data = (void *)irqport;
+
+		ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", board,
+			      ctl ? board + buddha_bases[i] + ctl : 0);
+	}
+
+	ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,
+			  IRQF_SHARED, &pata_buddha_sht);
+
+	return 0;
+}
+
+static void pata_buddha_remove(struct zorro_dev *z)
+{
+	struct ata_host *host = dev_get_drvdata(&z->dev);
+
+	ata_host_detach(host);
+}
+
+static const struct zorro_device_id pata_buddha_zorro_tbl[] = {
+	{ ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA, BOARD_BUDDHA},
+	{ ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL, BOARD_CATWEASEL},
+	{ 0 }
+};
+MODULE_DEVICE_TABLE(zorro, pata_buddha_zorro_tbl);
+
+static struct zorro_driver pata_buddha_driver = {
+	.name           = "pata_buddha",
+	.id_table       = pata_buddha_zorro_tbl,
+	.probe          = pata_buddha_probe,
+	.remove         = pata_buddha_remove,
+};
+
+/*
+ * We cannot have a modalias for X-Surf boards, as it competes with the
+ * zorro8390 network driver. As a stopgap measure until we have proper
+ * MFD support for this board, we manually attach to it late after Zorro
+ * has enumerated its boards.
+ */
+static int __init pata_buddha_late_init(void)
+{
+	struct zorro_dev *z = NULL;
+
+	/* Auto-bind to regular boards */
+	zorro_register_driver(&pata_buddha_driver);
+
+	/* Manually bind to all X-Surf boards */
+	while ((z = zorro_find_device(ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, z))) {
+		static struct zorro_device_id xsurf_ent = {
+			ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, BOARD_XSURF
+		};
+
+		pata_buddha_probe(z, &xsurf_ent);
+	}
+
+	return 0;
+}
+late_initcall(pata_buddha_late_init);
+
+MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
+MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(DRV_VERSION);