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