[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 <ralf@linux-mips.org>
Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

4 files changed, 207 insertions, 1 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 42e5b8175cbf..ed2bc87f475b 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -787,6 +787,10 @@ config BLK_DEV_IDE_PMAC_BLINK
           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
diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
index cca9c075966d..569fae717503 100644
--- a/drivers/ide/Makefile
+++ b/drivers/ide/Makefile
@@ -48,6 +48,6 @@ obj-$(CONFIG_BLK_DEV_IDECD)		+= ide-cd.o
 obj-$(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/
diff --git a/drivers/ide/mips/Makefile b/drivers/ide/mips/Makefile
new file mode 100644
index 000000000000..578e52a59588
--- /dev/null
+++ b/drivers/ide/mips/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_BLK_DEV_IDE_SWARM)         += swarm.o
diff --git a/drivers/ide/mips/swarm.c b/drivers/ide/mips/swarm.c
new file mode 100644
index 000000000000..66f6064f4640
--- /dev/null
+++ b/drivers/ide/mips/swarm.c
@@ -0,0 +1,201 @@
+/*
+ * Copyright (C) 2001, 2002, 2003 Broadcom Corporation
+ * Copyright (C) 2004 MontaVista Software Inc.
+ *      Author: Manish Lachwani, mlachwani@mvista.com
+ * Copyright (C) 2004  MIPS Technologies, Inc.  All rights reserved.
+ *      Author: Maciej W. Rozycki <macro@mips.com>
+ *
+ * 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);