--- /dev/null
+/*
+ * 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[50];
+};
+
+#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 unsigned int enable_dev_count;
+static int disable_dev[EISA_MAX_FORCED_DEV];
+static unsigned 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,
+ sizeof(edev->pretty_name));
+ 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;
+}
+
+static int eisa_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct eisa_device *edev = to_eisa_device(dev);
+
+ add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
+ return 0;
+}
+
+struct bus_type eisa_bus_type = {
+ .name = "eisa",
+ .match = eisa_bus_match,
+ .uevent = eisa_bus_uevent,
+};
+EXPORT_SYMBOL(eisa_bus_type);
+
+int eisa_driver_register(struct eisa_driver *edrv)
+{
+ edrv->driver.bus = &eisa_bus_type;
+ return driver_register(&edrv->driver);
+}
+EXPORT_SYMBOL(eisa_driver_register);
+
+void eisa_driver_unregister(struct eisa_driver *edrv)
+{
+ driver_unregister(&edrv->driver);
+}
+EXPORT_SYMBOL(eisa_driver_unregister);
+
+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 ssize_t eisa_show_modalias(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct eisa_device *edev = to_eisa_device(dev);
+ return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
+}
+
+static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, 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;
+
+ sig = decode_eisa_sig(sig_addr);
+ if (!sig)
+ 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;
+ dev_set_name(&edev->dev, "%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)
+{
+ int rc = device_register(&edev->dev);
+ if (rc) {
+ put_device(&edev->dev);
+ return rc;
+ }
+
+ rc = device_create_file(&edev->dev, &dev_attr_signature);
+ if (rc)
+ goto err_devreg;
+ rc = device_create_file(&edev->dev, &dev_attr_enabled);
+ if (rc)
+ goto err_sig;
+ rc = device_create_file(&edev->dev, &dev_attr_modalias);
+ if (rc)
+ goto err_enab;
+
+ return 0;
+
+err_enab:
+ device_remove_file(&edev->dev, &dev_attr_enabled);
+err_sig:
+ device_remove_file(&edev->dev, &dev_attr_signature);
+err_devreg:
+ device_unregister(&edev->dev);
+ return rc;
+}
+
+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_IO | 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;
+ char *enabled_str;
+
+ dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr);
+
+ /* First try to get hold of slot 0. If there is no device
+ * here, simply fail, unless root->force_probe is set. */
+
+ edev = kzalloc(sizeof(*edev), GFP_KERNEL);
+ if (!edev) {
+ dev_err(root->dev, "EISA: Couldn't allocate mainboard slot\n");
+ return -ENOMEM;
+ }
+
+ if (eisa_request_resources(root, edev, 0)) {
+ dev_warn(root->dev,
+ "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;
+ }
+
+ dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig);
+
+ if (eisa_register_device(edev)) {
+ dev_err(&edev->dev, "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++) {
+ edev = kzalloc(sizeof(*edev), GFP_KERNEL);
+ if (!edev) {
+ dev_err(root->dev, "EISA: Out of memory for slot %d\n",
+ i);
+ continue;
+ }
+
+ if (eisa_request_resources(root, edev, i)) {
+ dev_warn(root->dev,
+ "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;
+ }
+
+ if (edev->state == (EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED))
+ enabled_str = " (forced enabled)";
+ else if (edev->state == EISA_CONFIG_FORCED)
+ enabled_str = " (forced disabled)";
+ else if (edev->state == 0)
+ enabled_str = " (disabled)";
+ else
+ enabled_str = "";
+
+ dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i,
+ edev->id.sig, enabled_str);
+
+ c++;
+
+ if (eisa_register_device(edev)) {
+ dev_err(&edev->dev, "EISA: Failed to register %s\n",
+ edev->id.sig);
+ eisa_release_resources(edev);
+ kfree(edev);
+ }
+ }
+
+ dev_info(root->dev, "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;
+
+ err = request_resource(&eisa_root_res, &root->eisa_root_res);
+ if (err)
+ return err;
+
+ root->bus_nr = eisa_bus_count++;
+
+ err = eisa_probe(root);
+ if (err)
+ release_resource(&root->eisa_root_res);
+
+ return err;
+}
+
+static int __init eisa_init(void)
+{
+ int r;
+
+ r = bus_register(&eisa_bus_type);
+ if (r)
+ 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);
Code Review / kvmfornfv.git / blobdiff