Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8 -*- */ |
| 2 | |
| 3 | /* |
| 4 | * MCA bus support functions for sysfs. |
| 5 | * |
| 6 | * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com> |
| 7 | * |
| 8 | **----------------------------------------------------------------------------- |
| 9 | ** |
| 10 | ** This program is free software; you can redistribute it and/or modify |
| 11 | ** it under the terms of the GNU General Public License as published by |
| 12 | ** the Free Software Foundation; either version 2 of the License, or |
| 13 | ** (at your option) any later version. |
| 14 | ** |
| 15 | ** This program is distributed in the hope that it will be useful, |
| 16 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | ** GNU General Public License for more details. |
| 19 | ** |
| 20 | ** You should have received a copy of the GNU General Public License |
| 21 | ** along with this program; if not, write to the Free Software |
| 22 | ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 | ** |
| 24 | **----------------------------------------------------------------------------- |
| 25 | */ |
| 26 | |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/device.h> |
| 29 | #include <linux/mca.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/slab.h> |
| 33 | |
| 34 | /* Very few machines have more than one MCA bus. However, there are |
| 35 | * those that do (Voyager 35xx/5xxx), so we do it this way for future |
| 36 | * expansion. None that I know have more than 2 */ |
| 37 | static struct mca_bus *mca_root_busses[MAX_MCA_BUSSES]; |
| 38 | |
| 39 | #define MCA_DEVINFO(i,s) { .pos = i, .name = s } |
| 40 | |
| 41 | struct mca_device_info { |
| 42 | short pos_id; /* the 2 byte pos id for this card */ |
| 43 | char name[DEVICE_NAME_SIZE]; |
| 44 | }; |
| 45 | |
| 46 | static int mca_bus_match (struct device *dev, struct device_driver *drv) |
| 47 | { |
| 48 | struct mca_device *mca_dev = to_mca_device (dev); |
| 49 | struct mca_driver *mca_drv = to_mca_driver (drv); |
| 50 | const short *mca_ids = mca_drv->id_table; |
| 51 | int i; |
| 52 | |
| 53 | if (!mca_ids) |
| 54 | return 0; |
| 55 | |
| 56 | for(i = 0; mca_ids[i]; i++) { |
| 57 | if (mca_ids[i] == mca_dev->pos_id) { |
| 58 | mca_dev->index = i; |
| 59 | return 1; |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | struct bus_type mca_bus_type = { |
| 67 | .name = "MCA", |
| 68 | .match = mca_bus_match, |
| 69 | }; |
| 70 | EXPORT_SYMBOL (mca_bus_type); |
| 71 | |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 72 | static ssize_t mca_show_pos_id(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | { |
| 74 | /* four digits, \n and trailing \0 */ |
| 75 | struct mca_device *mca_dev = to_mca_device(dev); |
| 76 | int len; |
| 77 | |
| 78 | if(mca_dev->pos_id < MCA_DUMMY_POS_START) |
| 79 | len = sprintf(buf, "%04x\n", mca_dev->pos_id); |
| 80 | else |
| 81 | len = sprintf(buf, "none\n"); |
| 82 | return len; |
| 83 | } |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 84 | static ssize_t mca_show_pos(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | { |
| 86 | /* enough for 8 two byte hex chars plus space and new line */ |
| 87 | int j, len=0; |
| 88 | struct mca_device *mca_dev = to_mca_device(dev); |
| 89 | |
| 90 | for(j=0; j<8; j++) |
| 91 | len += sprintf(buf+len, "%02x ", mca_dev->pos[j]); |
| 92 | /* change last trailing space to new line */ |
| 93 | buf[len-1] = '\n'; |
| 94 | return len; |
| 95 | } |
| 96 | |
| 97 | static DEVICE_ATTR(id, S_IRUGO, mca_show_pos_id, NULL); |
| 98 | static DEVICE_ATTR(pos, S_IRUGO, mca_show_pos, NULL); |
| 99 | |
| 100 | int __init mca_register_device(int bus, struct mca_device *mca_dev) |
| 101 | { |
| 102 | struct mca_bus *mca_bus = mca_root_busses[bus]; |
| 103 | |
| 104 | mca_dev->dev.parent = &mca_bus->dev; |
| 105 | mca_dev->dev.bus = &mca_bus_type; |
| 106 | sprintf (mca_dev->dev.bus_id, "%02d:%02X", bus, mca_dev->slot); |
| 107 | mca_dev->dma_mask = mca_bus->default_dma_mask; |
| 108 | mca_dev->dev.dma_mask = &mca_dev->dma_mask; |
| 109 | mca_dev->dev.coherent_dma_mask = mca_dev->dma_mask; |
| 110 | |
| 111 | if (device_register(&mca_dev->dev)) |
| 112 | return 0; |
| 113 | |
| 114 | device_create_file(&mca_dev->dev, &dev_attr_id); |
| 115 | device_create_file(&mca_dev->dev, &dev_attr_pos); |
| 116 | |
| 117 | return 1; |
| 118 | } |
| 119 | |
| 120 | /* */ |
| 121 | struct mca_bus * __devinit mca_attach_bus(int bus) |
| 122 | { |
| 123 | struct mca_bus *mca_bus; |
| 124 | |
| 125 | if (unlikely(mca_root_busses[bus] != NULL)) { |
| 126 | /* This should never happen, but just in case */ |
| 127 | printk(KERN_EMERG "MCA tried to add already existing bus %d\n", |
| 128 | bus); |
| 129 | dump_stack(); |
| 130 | return NULL; |
| 131 | } |
| 132 | |
| 133 | mca_bus = kmalloc(sizeof(struct mca_bus), GFP_KERNEL); |
| 134 | if (!mca_bus) |
| 135 | return NULL; |
| 136 | memset(mca_bus, 0, sizeof(struct mca_bus)); |
| 137 | sprintf(mca_bus->dev.bus_id,"mca%d",bus); |
| 138 | sprintf(mca_bus->name,"Host %s MCA Bridge", bus ? "Secondary" : "Primary"); |
| 139 | device_register(&mca_bus->dev); |
| 140 | |
| 141 | mca_root_busses[bus] = mca_bus; |
| 142 | |
| 143 | return mca_bus; |
| 144 | } |
| 145 | |
| 146 | int __init mca_system_init (void) |
| 147 | { |
| 148 | return bus_register(&mca_bus_type); |
| 149 | } |