+/*
+ * 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);
git.openpandora.org / pandora-kernel.git / commitdiff