[IDE] Add driver for Sibyte Swarm evaluation board

This driver supports the IDE port on the Sibyte Swarm evaluation boards
and it's relatives for the BCM1250 family of systems on a chip.

Signed-off-by: Ralf Baechle <[e-mail]>
Acked-by: Bartlomiej Zolnierkiewicz <[e-mail]>

drivers/ide/Kconfig

···
 	  This option enables the use of the sleep LED as a hard drive
 	  activity LED.
 
+config BLK_DEV_IDE_SWARM
+	tristate "IDE for Sibyte evaluation boards"
+	depends on SIBYTE_SB1xxx_SOC
+
 config BLK_DEV_IDE_AU1XXX
        bool "IDE for AMD Alchemy Au1200"
        depends on SOC_AU1200

drivers/ide/Makefile

···
 obj-$(CONFIG_BLK_DEV_IDETAPE)		+= ide-tape.o
 obj-$(CONFIG_BLK_DEV_IDEFLOPPY)		+= ide-floppy.o
 
-obj-$(CONFIG_BLK_DEV_IDE)		+= legacy/ arm/
+obj-$(CONFIG_BLK_DEV_IDE)		+= legacy/ arm/ mips/
 obj-$(CONFIG_BLK_DEV_HD)		+= legacy/
 obj-$(CONFIG_ETRAX_IDE)		+= cris/

drivers/ide/mips/Makefile

···
+obj-$(CONFIG_BLK_DEV_IDE_SWARM)		+= swarm.o

drivers/ide/mips/swarm.c

···
+/*
+ * Copyright (C) 2001, 2002, 2003 Broadcom Corporation
+ * Copyright (C) 2004 MontaVista Software Inc.
+ *	Author:	Manish Lachwani, [e-mail]
+ * Copyright (C) 2004  MIPS Technologies, Inc.  All rights reserved.
+ *	Author: Maciej W. Rozycki <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+/*
+ *  Derived loosely from ide-pmac.c, so:
+ *  Copyright (C) 1998 Paul Mackerras.
+ *  Copyright (C) 1995-1998 Mark Lord
+ */
+
+/*
+ * Boards with SiByte processors so far have supported IDE devices via
+ * the Generic Bus, PCI bus, and built-in PCMCIA interface.  In all
+ * cases, byte-swapping must be avoided for these devices (whereas
+ * other PCI devices, for example, will require swapping).  Any
+ * SiByte-targetted kernel including IDE support will include this
+ * file.  Probing of a Generic Bus for an IDE device is controlled by
+ * the definition of "SIBYTE_HAVE_IDE", which is provided by
+ * <asm/sibyte/board.h> for Broadcom boards.
+ */
+
+#include <linux/ide.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+
+#include <asm/sibyte/board.h>
+#include <asm/sibyte/sb1250_genbus.h>
+#include <asm/sibyte/sb1250_regs.h>
+
+#define DRV_NAME "ide-swarm"
+
+static char swarm_ide_string[] = DRV_NAME;
+
+static struct resource swarm_ide_resource = {
+	.name	= "SWARM GenBus IDE",
+	.flags	= IORESOURCE_MEM,
+};
+
+static struct platform_device *swarm_ide_dev;
+
+/*
+ * swarm_ide_probe - if the board header indicates the existence of
+ * Generic Bus IDE, allocate a HWIF for it.
+ */
+static int __devinit swarm_ide_probe(struct device *dev)
+{
+	ide_hwif_t *hwif;
+	u8 __iomem *base;
+	phys_t offset, size;
+	int i;
+
+	if (!SIBYTE_HAVE_IDE)
+		return -ENODEV;
+
+	/* Find an empty slot.  */
+	for (i = 0; i < MAX_HWIFS; i++)
+		if (!ide_hwifs[i].io_ports[IDE_DATA_OFFSET])
+			break;
+	if (i >= MAX_HWIFS) {
+		printk(KERN_ERR DRV_NAME ": no free slot for interface\n");
+		return -ENOMEM;
+	}
+
+	hwif = ide_hwifs + i;
+
+	base = ioremap(A_IO_EXT_BASE, 0x800);
+	offset = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_START_ADDR, IDE_CS));
+	size = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_MULT_SIZE, IDE_CS));
+	iounmap(base);
+
+	offset = G_IO_START_ADDR(offset) << S_IO_ADDRBASE;
+	size = (G_IO_MULT_SIZE(size) + 1) << S_IO_REGSIZE;
+	if (offset < A_PHYS_GENBUS || offset >= A_PHYS_GENBUS_END) {
+		printk(KERN_INFO DRV_NAME
+		       ": IDE interface at GenBus disabled\n");
+		return -EBUSY;
+	}
+
+	printk(KERN_INFO DRV_NAME ": IDE interface at GenBus slot %i\n",
+	       IDE_CS);
+
+	swarm_ide_resource.start = offset;
+	swarm_ide_resource.end = offset + size - 1;
+	if (request_resource(&iomem_resource, &swarm_ide_resource)) {
+		printk(KERN_ERR DRV_NAME
+		       ": can't request I/O memory resource\n");
+		return -EBUSY;
+	}
+
+	base = ioremap(offset, size);
+
+	/* Setup MMIO ops.  */
+	default_hwif_mmiops(hwif);
+	/* Prevent resource map manipulation.  */
+	hwif->mmio = 2;
+	hwif->noprobe = 0;
+
+	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
+		hwif->hw.io_ports[i] =
+				(unsigned long)(base + ((0x1f0 + i) << 5));
+	hwif->hw.io_ports[IDE_CONTROL_OFFSET] =
+				(unsigned long)(base + (0x3f6 << 5));
+	hwif->hw.irq = K_INT_GB_IDE;
+
+	memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
+	hwif->irq = hwif->hw.irq;
+
+	dev_set_drvdata(dev, hwif);
+
+	return 0;
+}
+
+static struct device_driver swarm_ide_driver = {
+	.name	= swarm_ide_string,
+	.bus	= &platform_bus_type,
+	.probe	= swarm_ide_probe,
+};
+
+static void swarm_ide_platform_release(struct device *device)
+{
+	struct platform_device *pldev;
+
+	/* free device */
+	pldev = to_platform_device(device);
+	kfree(pldev);
+}
+
+static int __devinit swarm_ide_init_module(void)
+{
+	struct platform_device *pldev;
+	int err;
+
+	printk(KERN_INFO "SWARM IDE driver\n");
+
+	if (driver_register(&swarm_ide_driver)) {
+		printk(KERN_ERR "Driver registration failed\n");
+		err = -ENODEV;
+		goto out;
+	}
+
+        if (!(pldev = kmalloc(sizeof (*pldev), GFP_KERNEL))) {
+		err = -ENOMEM;
+		goto out_unregister_driver;
+	}
+
+	memset (pldev, 0, sizeof (*pldev));
+	pldev->name		= swarm_ide_string;
+	pldev->id		= 0;
+	pldev->dev.release	= swarm_ide_platform_release;
+
+	if (platform_device_register(pldev)) {
+		err = -ENODEV;
+		goto out_free_pldev;
+	}
+
+        if (!pldev->dev.driver) {
+		/*
+		 * The driver was not bound to this device, there was
+                 * no hardware at this address. Unregister it, as the
+		 * release fuction will take care of freeing the
+		 * allocated structure
+		 */
+		platform_device_unregister (pldev);
+	}
+
+	swarm_ide_dev = pldev;
+
+	return 0;
+
+out_free_pldev:
+	kfree(pldev);
+
+out_unregister_driver:
+	driver_unregister(&swarm_ide_driver);
+out:
+	return err;
+}
+
+module_init(swarm_ide_init_module);