[PATCH] ata: add Buddha PATA controller driver

Bartlomiej Zolnierkiewicz
2018-10-18T12:29:49Z

Add Buddha PATA controller driver. It enables libata support for
the Buddha, Catweasel and X-Surf expansion boards on the Zorro
expansion bus.

Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Michael Schmitz <schmitzmic@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
John, please test if possible..

drivers/ata/Kconfig | 12 ++
drivers/ata/Makefile | 1
drivers/ata/pata_buddha.c | 257 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 270 insertions(+)

Index: b/drivers/ata/Kconfig
===================================================================
--- a/drivers/ata/Kconfig 2018-10-18 14:18:02.766452406 +0200
+++ b/drivers/ata/Kconfig 2018-10-18 14:18:02.766452406 +0200
@@ -965,6 +965,18 @@ config PATA_GAYLE

If unsure, say N.

+config PATA_BUDDHA
+ tristate "Buddha/Catweasel/X-Surf PATA support"
+ depends on ZORRO
+ help
+ This option enables support for the IDE interfaces
+ on the Buddha, Catweasel and X-Surf expansion boards
+ on the Zorro expansion bus. It supports up to two
+ interfaces on the Buddha, three on the Catweasel and
+ two on the X-Surf.
+
+ 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 2018-10-18 14:18:02.766452406 +0200
+++ b/drivers/ata/Makefile 2018-10-18 14:18:02.766452406 +0200
@@ -98,6 +98,7 @@ obj-$(CONFIG_PATA_WINBOND) += pata_sl82c
obj-$(CONFIG_PATA_CMD640_PCI) += pata_cmd640.o
obj-$(CONFIG_PATA_FALCON) += pata_falcon.o
obj-$(CONFIG_PATA_GAYLE) += pata_gayle.o
+obj-$(CONFIG_PATA_BUDDHA) += pata_buddha.o
obj-$(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_buddha.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ b/drivers/ata/pata_buddha.c 2018-10-18 14:23:41.054460925 +0200
@@ -0,0 +1,257 @@
+// 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/module.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 "0.1.0"
+
+#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] __initdata = {
+ BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
+};
+
+static unsigned int xsurf_bases[2] __initdata = {
+ 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 __init pata_buddha_init_one(void)
+{
+ struct zorro_dev *z = NULL;
+
+ while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
+ static const char *board_name[]
+ = { "Buddha", "Catweasel", "X-Surf" };
+ struct ata_host *host;
+ void __iomem *buddha_board;
+ unsigned long board;
+ unsigned int type, nr_ports = 2;
+ int i;
+
+ if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
+ type = BOARD_BUDDHA;
+ } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
+ type = BOARD_CATWEASEL;
+ nr_ports++;
+ } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
+ type = BOARD_XSURF;
+ } else
+ continue;
+
+ 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))
+ continue;
+ } else {
+ if (!devm_request_mem_region(&z->dev,
+ board + XSURF_BASE1,
+ 0x1000, DRV_NAME))
+ continue;
+ if (!devm_request_mem_region(&z->dev,
+ board + XSURF_BASE2,
+ 0x1000, DRV_NAME))
+ continue;
+ }
+
+ /* allocate host */
+ host = ata_host_alloc(&z->dev, nr_ports);
+ if (!host)
+ continue;
+
+ 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;
+}
+
+module_init(pata_buddha_init_one);
+
+MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
+MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(DRV_VERSION);