452 lines
11 KiB
C
452 lines
11 KiB
C
/*
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* EISA bus support functions for sysfs.
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*
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* (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
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*
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* This code is released under the GPL version 2.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/eisa.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <asm/io.h>
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#define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))
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#define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }
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struct eisa_device_info {
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struct eisa_device_id id;
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char name[50];
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};
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#ifdef CONFIG_EISA_NAMES
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static struct eisa_device_info __initdata eisa_table[] = {
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#include "devlist.h"
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};
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#define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
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#endif
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#define EISA_MAX_FORCED_DEV 16
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static int enable_dev[EISA_MAX_FORCED_DEV];
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static unsigned int enable_dev_count;
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static int disable_dev[EISA_MAX_FORCED_DEV];
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static unsigned int disable_dev_count;
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static int is_forced_dev (int *forced_tab,
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int forced_count,
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struct eisa_root_device *root,
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struct eisa_device *edev)
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{
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int i, x;
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for (i = 0; i < forced_count; i++) {
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x = (root->bus_nr << 8) | edev->slot;
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if (forced_tab[i] == x)
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return 1;
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}
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return 0;
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}
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static void __init eisa_name_device (struct eisa_device *edev)
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{
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#ifdef CONFIG_EISA_NAMES
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int i;
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for (i = 0; i < EISA_INFOS; i++) {
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if (!strcmp (edev->id.sig, eisa_table[i].id.sig)) {
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strlcpy (edev->pretty_name,
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eisa_table[i].name,
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sizeof(edev->pretty_name));
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return;
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}
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}
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/* No name was found */
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sprintf (edev->pretty_name, "EISA device %.7s", edev->id.sig);
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#endif
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}
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static char __init *decode_eisa_sig(unsigned long addr)
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{
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static char sig_str[EISA_SIG_LEN];
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u8 sig[4];
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u16 rev;
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int i;
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for (i = 0; i < 4; i++) {
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#ifdef CONFIG_EISA_VLB_PRIMING
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/*
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* This ugly stuff is used to wake up VL-bus cards
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* (AHA-284x is the only known example), so we can
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* read the EISA id.
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*
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* Thankfully, this only exists on x86...
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*/
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outb(0x80 + i, addr);
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#endif
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sig[i] = inb (addr + i);
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if (!i && (sig[0] & 0x80))
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return NULL;
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}
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sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
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sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
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sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
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rev = (sig[2] << 8) | sig[3];
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sprintf(sig_str + 3, "%04X", rev);
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return sig_str;
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}
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static int eisa_bus_match (struct device *dev, struct device_driver *drv)
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{
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struct eisa_device *edev = to_eisa_device (dev);
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struct eisa_driver *edrv = to_eisa_driver (drv);
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const struct eisa_device_id *eids = edrv->id_table;
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if (!eids)
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return 0;
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while (strlen (eids->sig)) {
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if (!strcmp (eids->sig, edev->id.sig) &&
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edev->state & EISA_CONFIG_ENABLED) {
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edev->id.driver_data = eids->driver_data;
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return 1;
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}
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eids++;
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}
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return 0;
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}
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static int eisa_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct eisa_device *edev = to_eisa_device(dev);
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add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
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return 0;
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}
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struct bus_type eisa_bus_type = {
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.name = "eisa",
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.match = eisa_bus_match,
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.uevent = eisa_bus_uevent,
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};
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int eisa_driver_register (struct eisa_driver *edrv)
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{
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edrv->driver.bus = &eisa_bus_type;
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return driver_register (&edrv->driver);
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}
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void eisa_driver_unregister (struct eisa_driver *edrv)
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{
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driver_unregister (&edrv->driver);
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}
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static ssize_t eisa_show_sig (struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct eisa_device *edev = to_eisa_device (dev);
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return sprintf (buf,"%s\n", edev->id.sig);
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}
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static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
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static ssize_t eisa_show_state (struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct eisa_device *edev = to_eisa_device (dev);
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return sprintf (buf,"%d\n", edev->state & EISA_CONFIG_ENABLED);
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}
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static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
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static ssize_t eisa_show_modalias (struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct eisa_device *edev = to_eisa_device (dev);
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return sprintf (buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
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}
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static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);
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static int __init eisa_init_device (struct eisa_root_device *root,
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struct eisa_device *edev,
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int slot)
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{
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char *sig;
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unsigned long sig_addr;
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int i;
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sig_addr = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
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if (!(sig = decode_eisa_sig (sig_addr)))
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return -1; /* No EISA device here */
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memcpy (edev->id.sig, sig, EISA_SIG_LEN);
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edev->slot = slot;
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edev->state = inb (SLOT_ADDRESS (root, slot) + EISA_CONFIG_OFFSET) & EISA_CONFIG_ENABLED;
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edev->base_addr = SLOT_ADDRESS (root, slot);
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edev->dma_mask = root->dma_mask; /* Default DMA mask */
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eisa_name_device (edev);
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edev->dev.parent = root->dev;
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edev->dev.bus = &eisa_bus_type;
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edev->dev.dma_mask = &edev->dma_mask;
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edev->dev.coherent_dma_mask = edev->dma_mask;
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dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot);
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for (i = 0; i < EISA_MAX_RESOURCES; i++) {
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#ifdef CONFIG_EISA_NAMES
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edev->res[i].name = edev->pretty_name;
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#else
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edev->res[i].name = edev->id.sig;
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#endif
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}
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if (is_forced_dev (enable_dev, enable_dev_count, root, edev))
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edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
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if (is_forced_dev (disable_dev, disable_dev_count, root, edev))
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edev->state = EISA_CONFIG_FORCED;
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return 0;
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}
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static int __init eisa_register_device (struct eisa_device *edev)
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{
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int rc = device_register (&edev->dev);
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if (rc)
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return rc;
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rc = device_create_file (&edev->dev, &dev_attr_signature);
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if (rc) goto err_devreg;
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rc = device_create_file (&edev->dev, &dev_attr_enabled);
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if (rc) goto err_sig;
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rc = device_create_file (&edev->dev, &dev_attr_modalias);
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if (rc) goto err_enab;
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return 0;
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err_enab:
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device_remove_file (&edev->dev, &dev_attr_enabled);
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err_sig:
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device_remove_file (&edev->dev, &dev_attr_signature);
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err_devreg:
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device_unregister(&edev->dev);
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return rc;
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}
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static int __init eisa_request_resources (struct eisa_root_device *root,
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struct eisa_device *edev,
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int slot)
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{
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int i;
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for (i = 0; i < EISA_MAX_RESOURCES; i++) {
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/* Don't register resource for slot 0, since this is
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* very likely to fail... :-( Instead, grab the EISA
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* id, now we can display something in /proc/ioports.
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*/
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/* Only one region for mainboard */
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if (!slot && i > 0) {
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edev->res[i].start = edev->res[i].end = 0;
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continue;
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}
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if (slot) {
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edev->res[i].name = NULL;
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edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400);
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edev->res[i].end = edev->res[i].start + 0xff;
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edev->res[i].flags = IORESOURCE_IO;
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} else {
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edev->res[i].name = NULL;
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edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
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edev->res[i].end = edev->res[i].start + 3;
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edev->res[i].flags = IORESOURCE_BUSY;
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}
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if (request_resource (root->res, &edev->res[i]))
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goto failed;
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}
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return 0;
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failed:
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while (--i >= 0)
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release_resource (&edev->res[i]);
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return -1;
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}
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static void __init eisa_release_resources (struct eisa_device *edev)
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{
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int i;
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for (i = 0; i < EISA_MAX_RESOURCES; i++)
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if (edev->res[i].start || edev->res[i].end)
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release_resource (&edev->res[i]);
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}
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static int __init eisa_probe (struct eisa_root_device *root)
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{
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int i, c;
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struct eisa_device *edev;
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printk (KERN_INFO "EISA: Probing bus %d at %s\n",
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root->bus_nr, dev_name(root->dev));
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/* First try to get hold of slot 0. If there is no device
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* here, simply fail, unless root->force_probe is set. */
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if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
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printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n");
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return -ENOMEM;
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}
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if (eisa_request_resources (root, edev, 0)) {
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printk (KERN_WARNING \
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"EISA: Cannot allocate resource for mainboard\n");
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kfree (edev);
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if (!root->force_probe)
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return -EBUSY;
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goto force_probe;
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}
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if (eisa_init_device (root, edev, 0)) {
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eisa_release_resources (edev);
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kfree (edev);
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if (!root->force_probe)
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return -ENODEV;
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goto force_probe;
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}
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printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig);
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if (eisa_register_device (edev)) {
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printk (KERN_ERR "EISA: Failed to register %s\n",
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edev->id.sig);
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eisa_release_resources (edev);
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kfree (edev);
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}
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force_probe:
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for (c = 0, i = 1; i <= root->slots; i++) {
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if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
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printk (KERN_ERR "EISA: Out of memory for slot %d\n",
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i);
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continue;
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}
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if (eisa_request_resources (root, edev, i)) {
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printk (KERN_WARNING \
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"Cannot allocate resource for EISA slot %d\n",
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i);
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kfree (edev);
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continue;
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}
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if (eisa_init_device (root, edev, i)) {
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eisa_release_resources (edev);
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kfree (edev);
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continue;
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}
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printk (KERN_INFO "EISA: slot %d : %s detected",
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i, edev->id.sig);
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switch (edev->state) {
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case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED:
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printk (" (forced enabled)");
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break;
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case EISA_CONFIG_FORCED:
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printk (" (forced disabled)");
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break;
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case 0:
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printk (" (disabled)");
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break;
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}
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printk (".\n");
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c++;
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if (eisa_register_device (edev)) {
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printk (KERN_ERR "EISA: Failed to register %s\n",
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edev->id.sig);
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eisa_release_resources (edev);
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kfree (edev);
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}
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}
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printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s");
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return 0;
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}
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static struct resource eisa_root_res = {
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.name = "EISA root resource",
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.start = 0,
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.end = 0xffffffff,
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.flags = IORESOURCE_IO,
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};
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static int eisa_bus_count;
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int __init eisa_root_register (struct eisa_root_device *root)
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{
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int err;
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/* Use our own resources to check if this bus base address has
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* been already registered. This prevents the virtual root
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* device from registering after the real one has, for
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* example... */
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root->eisa_root_res.name = eisa_root_res.name;
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root->eisa_root_res.start = root->res->start;
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root->eisa_root_res.end = root->res->end;
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root->eisa_root_res.flags = IORESOURCE_BUSY;
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if ((err = request_resource (&eisa_root_res, &root->eisa_root_res)))
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return err;
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root->bus_nr = eisa_bus_count++;
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if ((err = eisa_probe (root)))
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release_resource (&root->eisa_root_res);
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return err;
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}
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static int __init eisa_init (void)
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{
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int r;
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if ((r = bus_register (&eisa_bus_type)))
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return r;
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printk (KERN_INFO "EISA bus registered\n");
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return 0;
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}
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module_param_array(enable_dev, int, &enable_dev_count, 0444);
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module_param_array(disable_dev, int, &disable_dev_count, 0444);
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postcore_initcall (eisa_init);
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int EISA_bus; /* for legacy drivers */
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EXPORT_SYMBOL (EISA_bus);
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EXPORT_SYMBOL (eisa_bus_type);
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EXPORT_SYMBOL (eisa_driver_register);
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EXPORT_SYMBOL (eisa_driver_unregister);
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