blob: c2e29571b0075d3647d2978f24c281cf4d0e7d0f [file] [log] [blame]
Ralf Baechle4237f222005-11-17 16:23:50 +00001/*
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>
Maciej W. Rozycki45e02b52006-10-06 00:44:02 -07007 * Copyright (c) 2006 Maciej W. Rozycki
Ralf Baechle4237f222005-11-17 16:23:50 +00008 *
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. */
Bartlomiej Zolnierkiewicz2ad1e552007-02-17 02:40:25 +0100118 hwif->mmio = 1;
Ralf Baechle4237f222005-11-17 16:23:50 +0000119 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
Maciej W. Rozycki45e02b52006-10-06 00:44:02 -0700131 probe_hwif_init(hwif);
Bartlomiej Zolnierkiewicz5cbf79c2007-05-10 00:01:11 +0200132
133 ide_proc_register_port(hwif);
134
Ralf Baechle4237f222005-11-17 16:23:50 +0000135 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
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700168 if (!(pldev = kzalloc(sizeof (*pldev), GFP_KERNEL))) {
Ralf Baechle4237f222005-11-17 16:23:50 +0000169 err = -ENOMEM;
170 goto out_unregister_driver;
171 }
172
Ralf Baechle4237f222005-11-17 16:23:50 +0000173 pldev->name = swarm_ide_string;
174 pldev->id = 0;
175 pldev->dev.release = swarm_ide_platform_release;
176
177 if (platform_device_register(pldev)) {
178 err = -ENODEV;
179 goto out_free_pldev;
180 }
181
182 if (!pldev->dev.driver) {
183 /*
184 * The driver was not bound to this device, there was
185 * no hardware at this address. Unregister it, as the
186 * release fuction will take care of freeing the
187 * allocated structure
188 */
189 platform_device_unregister (pldev);
190 }
191
192 swarm_ide_dev = pldev;
193
194 return 0;
195
196out_free_pldev:
197 kfree(pldev);
198
199out_unregister_driver:
200 driver_unregister(&swarm_ide_driver);
201out:
202 return err;
203}
204
205module_init(swarm_ide_init_module);