/*
* 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>
* Copyright (c) 2006 Maciej W. Rozycki
*
* 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;
u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
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 = 1;
hwif->chipset = ide_generic;
hwif->noprobe = 0;
for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
hwif->io_ports[i] =
(unsigned long)(base + ((0x1f0 + i) << 5));
hwif->io_ports[IDE_CONTROL_OFFSET] =
(unsigned long)(base + (0x3f6 << 5));
hwif->irq = K_INT_GB_IDE;
idx[0] = hwif->index;
ide_device_add(idx, NULL);
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 = kzalloc(sizeof (*pldev), GFP_KERNEL))) {
err = -ENOMEM;
goto out_unregister_driver;
}
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);
