1 files changed, 454 insertions, 0 deletions

diff --git a/drivers/eisa/eisa-bus.c b/drivers/eisa/eisa-bus.c
new file mode 100644
index 000000000..65bffde13
--- /dev/null
+++ b/drivers/eisa/eisa-bus.c
@@ -0,0 +1,454 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * EISA bus support functions for sysfs.
+ *
+ * (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
+ */
+
+#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 signature_show(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_RO(signature);
+
+static ssize_t enabled_show(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_RO(enabled);
+
+static ssize_t modalias_show(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_RO(modalias);
+
+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)
+		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);