Ralf Baechle | 4237f22 | 2005-11-17 16:23:50 +0000 | [diff] [blame^] | 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 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version 2 |
| 11 | * of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 21 | */ |
| 22 | |
| 23 | /* |
| 24 | * Derived loosely from ide-pmac.c, so: |
| 25 | * Copyright (C) 1998 Paul Mackerras. |
| 26 | * Copyright (C) 1995-1998 Mark Lord |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * Boards with SiByte processors so far have supported IDE devices via |
| 31 | * the Generic Bus, PCI bus, and built-in PCMCIA interface. In all |
| 32 | * cases, byte-swapping must be avoided for these devices (whereas |
| 33 | * other PCI devices, for example, will require swapping). Any |
| 34 | * SiByte-targetted kernel including IDE support will include this |
| 35 | * file. Probing of a Generic Bus for an IDE device is controlled by |
| 36 | * the definition of "SIBYTE_HAVE_IDE", which is provided by |
| 37 | * <asm/sibyte/board.h> for Broadcom boards. |
| 38 | */ |
| 39 | |
| 40 | #include <linux/ide.h> |
| 41 | #include <linux/ioport.h> |
| 42 | #include <linux/kernel.h> |
| 43 | #include <linux/types.h> |
| 44 | #include <linux/platform_device.h> |
| 45 | |
| 46 | #include <asm/io.h> |
| 47 | |
| 48 | #include <asm/sibyte/board.h> |
| 49 | #include <asm/sibyte/sb1250_genbus.h> |
| 50 | #include <asm/sibyte/sb1250_regs.h> |
| 51 | |
| 52 | #define DRV_NAME "ide-swarm" |
| 53 | |
| 54 | static char swarm_ide_string[] = DRV_NAME; |
| 55 | |
| 56 | static struct resource swarm_ide_resource = { |
| 57 | .name = "SWARM GenBus IDE", |
| 58 | .flags = IORESOURCE_MEM, |
| 59 | }; |
| 60 | |
| 61 | static struct platform_device *swarm_ide_dev; |
| 62 | |
| 63 | /* |
| 64 | * swarm_ide_probe - if the board header indicates the existence of |
| 65 | * Generic Bus IDE, allocate a HWIF for it. |
| 66 | */ |
| 67 | static int __devinit swarm_ide_probe(struct device *dev) |
| 68 | { |
| 69 | ide_hwif_t *hwif; |
| 70 | u8 __iomem *base; |
| 71 | phys_t offset, size; |
| 72 | int i; |
| 73 | |
| 74 | if (!SIBYTE_HAVE_IDE) |
| 75 | return -ENODEV; |
| 76 | |
| 77 | /* Find an empty slot. */ |
| 78 | for (i = 0; i < MAX_HWIFS; i++) |
| 79 | if (!ide_hwifs[i].io_ports[IDE_DATA_OFFSET]) |
| 80 | break; |
| 81 | if (i >= MAX_HWIFS) { |
| 82 | printk(KERN_ERR DRV_NAME ": no free slot for interface\n"); |
| 83 | return -ENOMEM; |
| 84 | } |
| 85 | |
| 86 | hwif = ide_hwifs + i; |
| 87 | |
| 88 | base = ioremap(A_IO_EXT_BASE, 0x800); |
| 89 | offset = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_START_ADDR, IDE_CS)); |
| 90 | size = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_MULT_SIZE, IDE_CS)); |
| 91 | iounmap(base); |
| 92 | |
| 93 | offset = G_IO_START_ADDR(offset) << S_IO_ADDRBASE; |
| 94 | size = (G_IO_MULT_SIZE(size) + 1) << S_IO_REGSIZE; |
| 95 | if (offset < A_PHYS_GENBUS || offset >= A_PHYS_GENBUS_END) { |
| 96 | printk(KERN_INFO DRV_NAME |
| 97 | ": IDE interface at GenBus disabled\n"); |
| 98 | return -EBUSY; |
| 99 | } |
| 100 | |
| 101 | printk(KERN_INFO DRV_NAME ": IDE interface at GenBus slot %i\n", |
| 102 | IDE_CS); |
| 103 | |
| 104 | swarm_ide_resource.start = offset; |
| 105 | swarm_ide_resource.end = offset + size - 1; |
| 106 | if (request_resource(&iomem_resource, &swarm_ide_resource)) { |
| 107 | printk(KERN_ERR DRV_NAME |
| 108 | ": can't request I/O memory resource\n"); |
| 109 | return -EBUSY; |
| 110 | } |
| 111 | |
| 112 | base = ioremap(offset, size); |
| 113 | |
| 114 | /* Setup MMIO ops. */ |
| 115 | default_hwif_mmiops(hwif); |
| 116 | /* Prevent resource map manipulation. */ |
| 117 | hwif->mmio = 2; |
| 118 | hwif->noprobe = 0; |
| 119 | |
| 120 | for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) |
| 121 | hwif->hw.io_ports[i] = |
| 122 | (unsigned long)(base + ((0x1f0 + i) << 5)); |
| 123 | hwif->hw.io_ports[IDE_CONTROL_OFFSET] = |
| 124 | (unsigned long)(base + (0x3f6 << 5)); |
| 125 | hwif->hw.irq = K_INT_GB_IDE; |
| 126 | |
| 127 | memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports)); |
| 128 | hwif->irq = hwif->hw.irq; |
| 129 | |
| 130 | dev_set_drvdata(dev, hwif); |
| 131 | |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | static struct device_driver swarm_ide_driver = { |
| 136 | .name = swarm_ide_string, |
| 137 | .bus = &platform_bus_type, |
| 138 | .probe = swarm_ide_probe, |
| 139 | }; |
| 140 | |
| 141 | static void swarm_ide_platform_release(struct device *device) |
| 142 | { |
| 143 | struct platform_device *pldev; |
| 144 | |
| 145 | /* free device */ |
| 146 | pldev = to_platform_device(device); |
| 147 | kfree(pldev); |
| 148 | } |
| 149 | |
| 150 | static int __devinit swarm_ide_init_module(void) |
| 151 | { |
| 152 | struct platform_device *pldev; |
| 153 | int err; |
| 154 | |
| 155 | printk(KERN_INFO "SWARM IDE driver\n"); |
| 156 | |
| 157 | if (driver_register(&swarm_ide_driver)) { |
| 158 | printk(KERN_ERR "Driver registration failed\n"); |
| 159 | err = -ENODEV; |
| 160 | goto out; |
| 161 | } |
| 162 | |
| 163 | if (!(pldev = kmalloc(sizeof (*pldev), GFP_KERNEL))) { |
| 164 | err = -ENOMEM; |
| 165 | goto out_unregister_driver; |
| 166 | } |
| 167 | |
| 168 | memset (pldev, 0, sizeof (*pldev)); |
| 169 | pldev->name = swarm_ide_string; |
| 170 | pldev->id = 0; |
| 171 | pldev->dev.release = swarm_ide_platform_release; |
| 172 | |
| 173 | if (platform_device_register(pldev)) { |
| 174 | err = -ENODEV; |
| 175 | goto out_free_pldev; |
| 176 | } |
| 177 | |
| 178 | if (!pldev->dev.driver) { |
| 179 | /* |
| 180 | * The driver was not bound to this device, there was |
| 181 | * no hardware at this address. Unregister it, as the |
| 182 | * release fuction will take care of freeing the |
| 183 | * allocated structure |
| 184 | */ |
| 185 | platform_device_unregister (pldev); |
| 186 | } |
| 187 | |
| 188 | swarm_ide_dev = pldev; |
| 189 | |
| 190 | return 0; |
| 191 | |
| 192 | out_free_pldev: |
| 193 | kfree(pldev); |
| 194 | |
| 195 | out_unregister_driver: |
| 196 | driver_unregister(&swarm_ide_driver); |
| 197 | out: |
| 198 | return err; |
| 199 | } |
| 200 | |
| 201 | module_init(swarm_ide_init_module); |