1/*
2 * Copyright (C) 2001, 2002, 2003 Broadcom Corporation
3 * Copyright (C) 2004 MontaVista Software Inc.
4 *	Author:	Manish Lachwani, mlachwani@mvista.com
5 * Copyright (C) 2004  MIPS Technologies, Inc.  All rights reserved.
6 *	Author: Maciej W. Rozycki <macro@mips.com>
7 * Copyright (c) 2006  Maciej W. Rozycki
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
22 */
23
24/*
25 *  Derived loosely from ide-pmac.c, so:
26 *  Copyright (C) 1998 Paul Mackerras.
27 *  Copyright (C) 1995-1998 Mark Lord
28 */
29
30/*
31 * Boards with SiByte processors so far have supported IDE devices via
32 * the Generic Bus, PCI bus, and built-in PCMCIA interface.  In all
33 * cases, byte-swapping must be avoided for these devices (whereas
34 * other PCI devices, for example, will require swapping).  Any
35 * SiByte-targetted kernel including IDE support will include this
36 * file.  Probing of a Generic Bus for an IDE device is controlled by
37 * the definition of "SIBYTE_HAVE_IDE", which is provided by
38 * <asm/sibyte/board.h> for Broadcom boards.
39 */
40
41#include <linux/ide.h>
42#include <linux/ioport.h>
43#include <linux/kernel.h>
44#include <linux/types.h>
45#include <linux/platform_device.h>
46
47#include <asm/io.h>
48
49#include <asm/sibyte/board.h>
50#include <asm/sibyte/sb1250_genbus.h>
51#include <asm/sibyte/sb1250_regs.h>
52
53#define DRV_NAME "ide-swarm"
54
55static char swarm_ide_string[] = DRV_NAME;
56
57static struct resource swarm_ide_resource = {
58	.name	= "SWARM GenBus IDE",
59	.flags	= IORESOURCE_MEM,
60};
61
62static struct platform_device *swarm_ide_dev;
63
64/*
65 * swarm_ide_probe - if the board header indicates the existence of
66 * Generic Bus IDE, allocate a HWIF for it.
67 */
68static int __devinit swarm_ide_probe(struct device *dev)
69{
70	ide_hwif_t *hwif;
71	u8 __iomem *base;
72	phys_t offset, size;
73	int i;
74
75	if (!SIBYTE_HAVE_IDE)
76		return -ENODEV;
77
78	/* Find an empty slot.  */
79	for (i = 0; i < MAX_HWIFS; i++)
80		if (!ide_hwifs[i].io_ports[IDE_DATA_OFFSET])
81			break;
82	if (i >= MAX_HWIFS) {
83		printk(KERN_ERR DRV_NAME ": no free slot for interface\n");
84		return -ENOMEM;
85	}
86
87	hwif = ide_hwifs + i;
88
89	base = ioremap(A_IO_EXT_BASE, 0x800);
90	offset = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_START_ADDR, IDE_CS));
91	size = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_MULT_SIZE, IDE_CS));
92	iounmap(base);
93
94	offset = G_IO_START_ADDR(offset) << S_IO_ADDRBASE;
95	size = (G_IO_MULT_SIZE(size) + 1) << S_IO_REGSIZE;
96	if (offset < A_PHYS_GENBUS || offset >= A_PHYS_GENBUS_END) {
97		printk(KERN_INFO DRV_NAME
98		       ": IDE interface at GenBus disabled\n");
99		return -EBUSY;
100	}
101
102	printk(KERN_INFO DRV_NAME ": IDE interface at GenBus slot %i\n",
103	       IDE_CS);
104
105	swarm_ide_resource.start = offset;
106	swarm_ide_resource.end = offset + size - 1;
107	if (request_resource(&iomem_resource, &swarm_ide_resource)) {
108		printk(KERN_ERR DRV_NAME
109		       ": can't request I/O memory resource\n");
110		return -EBUSY;
111	}
112
113	base = ioremap(offset, size);
114
115	/* Setup MMIO ops.  */
116	default_hwif_mmiops(hwif);
117	/* Prevent resource map manipulation.  */
118	hwif->mmio = 1;
119	hwif->noprobe = 0;
120
121	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
122		hwif->hw.io_ports[i] =
123				(unsigned long)(base + ((0x1f0 + i) << 5));
124	hwif->hw.io_ports[IDE_CONTROL_OFFSET] =
125				(unsigned long)(base + (0x3f6 << 5));
126	hwif->hw.irq = K_INT_GB_IDE;
127
128	memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
129	hwif->irq = hwif->hw.irq;
130
131	probe_hwif_init(hwif);
132
133	ide_proc_register_port(hwif);
134
135	dev_set_drvdata(dev, hwif);
136
137	return 0;
138}
139
140static struct device_driver swarm_ide_driver = {
141	.name	= swarm_ide_string,
142	.bus	= &platform_bus_type,
143	.probe	= swarm_ide_probe,
144};
145
146static void swarm_ide_platform_release(struct device *device)
147{
148	struct platform_device *pldev;
149
150	/* free device */
151	pldev = to_platform_device(device);
152	kfree(pldev);
153}
154
155static int __devinit swarm_ide_init_module(void)
156{
157	struct platform_device *pldev;
158	int err;
159
160	printk(KERN_INFO "SWARM IDE driver\n");
161
162	if (driver_register(&swarm_ide_driver)) {
163		printk(KERN_ERR "Driver registration failed\n");
164		err = -ENODEV;
165		goto out;
166	}
167
168        if (!(pldev = kmalloc(sizeof (*pldev), GFP_KERNEL))) {
169		err = -ENOMEM;
170		goto out_unregister_driver;
171	}
172
173	memset (pldev, 0, sizeof (*pldev));
174	pldev->name		= swarm_ide_string;
175	pldev->id		= 0;
176	pldev->dev.release	= swarm_ide_platform_release;
177
178	if (platform_device_register(pldev)) {
179		err = -ENODEV;
180		goto out_free_pldev;
181	}
182
183        if (!pldev->dev.driver) {
184		/*
185		 * The driver was not bound to this device, there was
186                 * no hardware at this address. Unregister it, as the
187		 * release fuction will take care of freeing the
188		 * allocated structure
189		 */
190		platform_device_unregister (pldev);
191	}
192
193	swarm_ide_dev = pldev;
194
195	return 0;
196
197out_free_pldev:
198	kfree(pldev);
199
200out_unregister_driver:
201	driver_unregister(&swarm_ide_driver);
202out:
203	return err;
204}
205
206module_init(swarm_ide_init_module);
207