diff options
Diffstat (limited to 'drivers/mca/mca-bus.c')
| -rw-r--r-- | drivers/mca/mca-bus.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/drivers/mca/mca-bus.c b/drivers/mca/mca-bus.c new file mode 100644 index 00000000..ada5ebba --- /dev/null +++ b/drivers/mca/mca-bus.c @@ -0,0 +1,169 @@ +/* -*- mode: c; c-basic-offset: 8 -*- */ + +/* + * MCA bus support functions for sysfs. + * + * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com> + * +**----------------------------------------------------------------------------- +** +** 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., 675 Mass Ave, Cambridge, MA 02139, USA. +** +**----------------------------------------------------------------------------- + */ + +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/mca.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> + +/* Very few machines have more than one MCA bus. However, there are + * those that do (Voyager 35xx/5xxx), so we do it this way for future + * expansion. None that I know have more than 2 */ +static struct mca_bus *mca_root_busses[MAX_MCA_BUSSES]; + +#define MCA_DEVINFO(i,s) { .pos = i, .name = s } + +struct mca_device_info { + short pos_id; /* the 2 byte pos id for this card */ + char name[50]; +}; + +static int mca_bus_match (struct device *dev, struct device_driver *drv) +{ + struct mca_device *mca_dev = to_mca_device (dev); + struct mca_driver *mca_drv = to_mca_driver (drv); + const unsigned short *mca_ids = mca_drv->id_table; + int i = 0; + + if (mca_ids) { + for(i = 0; mca_ids[i]; i++) { + if (mca_ids[i] == mca_dev->pos_id) { + mca_dev->index = i; + return 1; + } + } + } + /* If the integrated id is present, treat it as though it were an + * additional id in the id_table (it can't be because by definition, + * integrated id's overflow a short */ + if (mca_drv->integrated_id && mca_dev->pos_id == + mca_drv->integrated_id) { + mca_dev->index = i; + return 1; + } + return 0; +} + +struct bus_type mca_bus_type = { + .name = "MCA", + .match = mca_bus_match, +}; +EXPORT_SYMBOL (mca_bus_type); + +static ssize_t mca_show_pos_id(struct device *dev, struct device_attribute *attr, char *buf) +{ + /* four digits, \n and trailing \0 */ + struct mca_device *mca_dev = to_mca_device(dev); + int len; + + if(mca_dev->pos_id < MCA_DUMMY_POS_START) + len = sprintf(buf, "%04x\n", mca_dev->pos_id); + else + len = sprintf(buf, "none\n"); + return len; +} +static ssize_t mca_show_pos(struct device *dev, struct device_attribute *attr, char *buf) +{ + /* enough for 8 two byte hex chars plus space and new line */ + int j, len=0; + struct mca_device *mca_dev = to_mca_device(dev); + + for(j=0; j<8; j++) + len += sprintf(buf+len, "%02x ", mca_dev->pos[j]); + /* change last trailing space to new line */ + buf[len-1] = '\n'; + return len; +} + +static DEVICE_ATTR(id, S_IRUGO, mca_show_pos_id, NULL); +static DEVICE_ATTR(pos, S_IRUGO, mca_show_pos, NULL); + +int __init mca_register_device(int bus, struct mca_device *mca_dev) +{ + struct mca_bus *mca_bus = mca_root_busses[bus]; + int rc; + + mca_dev->dev.parent = &mca_bus->dev; + mca_dev->dev.bus = &mca_bus_type; + dev_set_name(&mca_dev->dev, "%02d:%02X", bus, mca_dev->slot); + mca_dev->dma_mask = mca_bus->default_dma_mask; + mca_dev->dev.dma_mask = &mca_dev->dma_mask; + mca_dev->dev.coherent_dma_mask = mca_dev->dma_mask; + + rc = device_register(&mca_dev->dev); + if (rc) + goto err_out; + + rc = device_create_file(&mca_dev->dev, &dev_attr_id); + if (rc) goto err_out_devreg; + rc = device_create_file(&mca_dev->dev, &dev_attr_pos); + if (rc) goto err_out_id; + + return 1; + +err_out_id: + device_remove_file(&mca_dev->dev, &dev_attr_id); +err_out_devreg: + device_unregister(&mca_dev->dev); +err_out: + return 0; +} + +/* */ +struct mca_bus * __devinit mca_attach_bus(int bus) +{ + struct mca_bus *mca_bus; + + if (unlikely(mca_root_busses[bus] != NULL)) { + /* This should never happen, but just in case */ + printk(KERN_EMERG "MCA tried to add already existing bus %d\n", + bus); + dump_stack(); + return NULL; + } + + mca_bus = kzalloc(sizeof(struct mca_bus), GFP_KERNEL); + if (!mca_bus) + return NULL; + + dev_set_name(&mca_bus->dev, "mca%d", bus); + sprintf(mca_bus->name,"Host %s MCA Bridge", bus ? "Secondary" : "Primary"); + if (device_register(&mca_bus->dev)) { + kfree(mca_bus); + return NULL; + } + + mca_root_busses[bus] = mca_bus; + + return mca_bus; +} + +int __init mca_system_init (void) +{ + return bus_register(&mca_bus_type); +} |