patch-2.4.20 linux-2.4.20/arch/parisc/kernel/drivers.c

• Lines: 681
• Date: Thu Nov 28 15:53:10 2002
• Orig file: linux-2.4.19/arch/parisc/kernel/drivers.c
• Orig date: Wed Dec 6 11:46:39 2000

diff -urN linux-2.4.19/arch/parisc/kernel/drivers.c linux-2.4.20/arch/parisc/kernel/drivers.c
@@ -1,134 +1,591 @@
 /*
-
-drivers.c
-
-Copyright (c) 1999 The Puffin Group 
-
-This is a collection of routines intended to register all the devices
-in a system, and register device drivers.
-
-*/
+ * drivers.c
+ *
+ * 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.
+ *
+ * Copyright (c) 1999 The Puffin Group
+ * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
+ * Copyright (c) 2001 Helge Deller <deller@gmx.de>
+ * 
+ * The file handles registering devices and drivers, then matching them.
+ * It's the closest we get to a dating agency.
+ */
 
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
 #include <asm/hardware.h>
 #include <asm/io.h>
 #include <asm/pdc.h>
+#include <asm/gsc.h>
 
+/* See comments in include/asm-parisc/pci.h */
+struct pci_dma_ops *hppa_dma_ops;
 
-extern struct hp_hardware *parisc_get_reference(
-	unsigned short hw_type, unsigned long hversion, 
-	unsigned long sversion );
+static struct parisc_driver *pa_drivers;
+static struct parisc_device root;
 
+/* This lock protects the pa_drivers list _only_ since all parisc_devices
+ * are registered before smp_init() is called.  If you wish to add devices
+ * after that, this muct be serialised somehow.  I recommend a semaphore
+ * rather than a spinlock since driver ->probe functions are allowed to
+ * sleep (for example when allocating memory).
+ */
+static spinlock_t pa_lock = SPIN_LOCK_UNLOCKED;
 
-/* I'm assuming there'll never be 64 devices.  We should probably make 
-   this more flexible.  */
+#define for_each_padev(dev) \
+	for (dev = root.child; dev != NULL; dev = next_dev(dev))
 
-#define MAX_DEVICES 64
+#define check_dev(dev) \
+	(dev->id.hw_type != HPHW_FAULTY) ? dev : next_dev(dev)
 
-unsigned int num_devices = 0;
+/**
+ * next_dev - enumerates registered devices
+ * @dev: the previous device returned from next_dev
+ *
+ * next_dev does a depth-first search of the tree, returning parents
+ * before children.  Returns NULL when there are no more devices.
+ */
+struct parisc_device *next_dev(struct parisc_device *dev)
+{
+	if (dev->child) {
+		return check_dev(dev->child);
+	} else if (dev->sibling) {
+		return dev->sibling;
+	}
 
-struct hp_device devices[MAX_DEVICES];
+	/* Exhausted tree at this level, time to go up. */
+	do {
+		dev = dev->parent;
+		if (dev && dev->sibling)
+			return dev->sibling;
+	} while (dev != &root);
 
-static unsigned long pdc_result[32] __attribute__ ((aligned (16))) = {0,0,0,0};
-static  u8 iodc_data[32] __attribute__ ((aligned (64)));
+	return NULL;
+}
 
-/*
- *	XXX should we be using a locked array ?
+/**
+ * match_device - Report whether this driver can handle this device
+ * @driver: the PA-RISC driver to try
+ * @dev: the PA-RISC device to try
  */
- 
-int register_driver(struct pa_iodc_driver *driver)
+static int match_device(struct parisc_driver *driver, struct parisc_device *dev)
 {
-	unsigned int i;
-	struct hp_device * device;
+	const struct parisc_device_id *ids;
 
-	for (;driver->check;driver++)  {
+	for (ids = driver->id_table; ids->sversion; ids++) {
+		if ((ids->sversion != SVERSION_ANY_ID) &&
+		    (ids->sversion != dev->id.sversion))
+			continue;
+
+		if ((ids->hw_type != HWTYPE_ANY_ID) &&
+		    (ids->hw_type != dev->id.hw_type))
+			continue;
+
+		if ((ids->hversion != HVERSION_ANY_ID) &&
+		    (ids->hversion != dev->id.hversion))
+			continue;
 
-		for (i=0;i<num_devices;i++) {
-			device = &devices[i];
+		return 1;
+	}
+	return 0;
+}
 
-			if (device->managed) continue;
+static void claim_device(struct parisc_driver *driver, struct parisc_device *dev)
+{
+	dev->driver = driver;
+	request_mem_region(dev->hpa, 0x1000, driver->name);
+}
 
-			if ((driver->check & DRIVER_CHECK_HWTYPE) &&
-			    (driver->hw_type != device->hw_type))
-				continue;
-			if ((driver->check & DRIVER_CHECK_HVERSION) &&
-			    (driver->hversion != device->hversion))
-				continue;
-			if ((driver->check & DRIVER_CHECK_HVERSION_REV) &&
-			    (driver->hversion_rev != device->hversion_rev))
-				continue;
-			if ((driver->check & DRIVER_CHECK_SVERSION) &&
-			    (driver->sversion != device->sversion))
-				continue;
-			if ((driver->check & DRIVER_CHECK_SVERSION_REV) &&
-			    (driver->sversion_rev != device->sversion_rev))
-				continue;
-			if ((driver->check & DRIVER_CHECK_OPT) &&
-			    (driver->opt != device->opt))
-				continue;
-			if ( (*driver->callback)(device,driver) ==0) {
-				device->managed=1;
-			} else {
-				printk("Warning : device (%d, 0x%x, 0x%x, 0x%x, 0x%x) NOT claimed by %s %s\n",
-					device->hw_type,
-					device->hversion, device->hversion_rev,
-					device->sversion, device->sversion_rev,
-					driver->name, driver->version);
-			}
+/**
+ * register_parisc_driver - Register this driver if it can handle a device
+ * @driver: the PA-RISC driver to try
+ */
+int register_parisc_driver(struct parisc_driver *driver)
+{
+	struct parisc_device *device;
+
+	if (driver->next) {
+		printk(KERN_WARNING 
+		       "BUG: Skipping previously registered driver: %s\n",
+		       driver->name);
+		return 1;
+	}
+
+	for_each_padev(device) {
+		if (device->driver)
+			continue;
+		if (!match_device(driver, device))
+			continue;
+
+		if (driver->probe(device) < 0)
+			continue;
+		claim_device(driver, device);
+	}
+
+	/* Note that the list is in reverse order of registration.  This
+	 * may be significant if we ever actually support hotplug and have
+	 * multiple drivers capable of claiming the same chip.
+	 */
+
+	spin_lock(&pa_lock);
+	driver->next = pa_drivers;
+	pa_drivers = driver;
+	spin_unlock(&pa_lock);
+
+	return 0;
+}
+
+/**
+ * count_parisc_driver - count # of devices this driver would match
+ * @driver: the PA-RISC driver to try
+ *
+ * Use by IOMMU support to "guess" the right size IOPdir.
+ * Formula is something like memsize/(num_iommu * entry_size).
+ */
+int count_parisc_driver(struct parisc_driver *driver)
+{
+	struct parisc_device *device;
+	int cnt = 0;
+
+	for_each_padev(device) {
+		if (match_device(driver, device))
+			cnt++;
+	}
+
+	return cnt;
+}
+
+
+
+/**
+ * unregister_parisc_driver - Unregister this driver from the list of drivers
+ * @driver: the PA-RISC driver to unregister
+ */
+int unregister_parisc_driver(struct parisc_driver *driver)
+{
+	struct parisc_device *dev;
+
+	spin_lock(&pa_lock);
+
+	if (pa_drivers == driver) {
+		/* was head of list - update head */
+		pa_drivers = driver->next;
+	} else {
+		struct parisc_driver *prev = pa_drivers;
+
+		while (prev && driver != prev->next) {
+			prev = prev->next;
+		}
+
+		if (!prev) {
+			printk(KERN_WARNING "unregister_parisc_driver: %s wasn't registered\n", driver->name);
+		} else {
+			/* Drop driver from list */
+			prev->next = driver->next;
+			driver->next = NULL;
 		}
+
 	}
+
+	spin_unlock(&pa_lock);
+
+	for_each_padev(dev) {
+		if (dev->driver != driver)
+			continue;
+		dev->driver = NULL;
+		release_mem_region(dev->hpa, 0x1000);
+	}
+
 	return 0;
 }
 
+static struct parisc_device *find_device_by_addr(unsigned long hpa)
+{
+	struct parisc_device *dev;
+	for_each_padev(dev) {
+		if (dev->hpa == hpa)
+			return dev;
+	}
+	return NULL;
+}
 
-struct hp_device * register_module(void *hpa)
+/**
+ * find_pa_parent_type - Find a parent of a specific type
+ * @dev: The device to start searching from
+ * @type: The device type to search for.
+ *
+ * Walks up the device tree looking for a device of the specified type.
+ * If it finds it, it returns it.  If not, it returns NULL.
+ */
+const struct parisc_device *find_pa_parent_type(const struct parisc_device *dev, int type)
 {
+	while (dev != &root) {
+		if (dev->id.hw_type == type)
+			return dev;
+		dev = dev->parent;
+	}
 
-	struct hp_device * d;
+	return NULL;
+}
+
+static void
+get_node_path(struct parisc_device *dev, struct hardware_path *path)
+{
+	int i = 5;
+	memset(&path->bc, -1, 6);
+	while (dev != &root) {
+		path->bc[i--] = dev->hw_path;
+		dev = dev->parent;
+	}
+}
+
+static char *print_hwpath(struct hardware_path *path, char *output)
+{
+	int i;
+	for (i = 0; i < 6; i++) {
+		if (path->bc[i] == -1)
+			continue;
+		output += sprintf(output, "%u/", (unsigned char) path->bc[i]);
+	}
+	output += sprintf(output, "%u", (unsigned char) path->mod);
+	return output;
+}
+
+/**
+ * print_pa_hwpath - Returns hardware path for PA devices
+ * dev: The device to return the path for
+ * output: Pointer to a previously-allocated array to place the path in.
+ *
+ * This function fills in the output array with a human-readable path
+ * to a PA device.  This string is compatible with that used by PDC, and
+ * may be printed on the outside of the box.
+ */
+char *print_pa_hwpath(struct parisc_device *dev, char *output)
+{
+	struct hardware_path path;
+
+	get_node_path(dev->parent, &path);
+	path.mod = dev->hw_path;
+	return print_hwpath(&path, output);
+}
+
+
+#if defined(CONFIG_PCI) || defined(CONFIG_ISA)
+/**
+ * get_pci_node_path - Returns hardware path for PCI devices
+ * dev: The device to return the path for
+ * output: Pointer to a previously-allocated array to place the path in.
+ *
+ * This function fills in the hardware_path structure with the route to
+ * the specified PCI device.  This structure is suitable for passing to
+ * PDC calls.
+ */
+void get_pci_node_path(struct pci_dev *dev, struct hardware_path *path)
+{
+	struct pci_bus *bus;
+	const struct parisc_device *padev;
+	int i = 5;
+
+	memset(&path->bc, -1, 6);
+	path->mod = PCI_FUNC(dev->devfn);
+	path->bc[i--] = PCI_SLOT(dev->devfn);
+	for (bus = dev->bus; bus->parent; bus = bus->parent) {
+		unsigned int devfn = bus->self->devfn;
+		path->bc[i--] = PCI_SLOT(devfn) | (PCI_FUNC(devfn) << 5);
+	}
+
+	padev = HBA_DATA(bus->sysdata)->dev;
+	while (padev != &root) {
+		path->bc[i--] = padev->hw_path;
+		padev = padev->parent;
+	}
+}
+
+/**
+ * print_pci_hwpath - Returns hardware path for PCI devices
+ * dev: The device to return the path for
+ * output: Pointer to a previously-allocated array to place the path in.
+ *
+ * This function fills in the output array with a human-readable path
+ * to a PCI device.  This string is compatible with that used by PDC, and
+ * may be printed on the outside of the box.
+ */
+char *print_pci_hwpath(struct pci_dev *dev, char *output)
+{
+	struct hardware_path path;
+
+	get_pci_node_path(dev, &path);
+	return print_hwpath(&path, output);
+}
+#endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */
+
+
+struct parisc_device * create_tree_node(char id, struct parisc_device *parent,
+		struct parisc_device **insert)
+{
+	struct parisc_device *dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return NULL;
+	memset(dev, 0, sizeof(*dev));
+	dev->hw_path = id;
+	dev->id.hw_type = HPHW_FAULTY;
+	dev->parent = parent;
+	dev->sibling = *insert;
+	*insert = dev;
+	return dev;
+}
+
+/**
+ * alloc_tree_node - returns a device entry in the iotree
+ * @parent: the parent node in the tree
+ * @id: the element of the module path for this entry
+ *
+ * Checks all the children of @parent for a matching @id.  If none
+ * found, it allocates a new device and returns it.
+ */
+struct parisc_device *
+alloc_tree_node(struct parisc_device *parent, char id)
+{
+	struct parisc_device *prev;
+	if ((!parent->child) || (parent->child->hw_path > id)) {
+		return create_tree_node(id, parent, &parent->child);
+	}
+
+	prev = parent->child;
+	if (prev->hw_path == id)
+		return prev;
+
+	while (prev->sibling && prev->sibling->hw_path < id) {
+		prev = prev->sibling;
+	}
+
+	if ((prev->sibling) && (prev->sibling->hw_path == id))
+		return prev->sibling;
+
+	return create_tree_node(id, parent, &prev->sibling);
+}
+
+static struct parisc_device *find_parisc_device(struct hardware_path *modpath)
+{
+	int i;
+	struct parisc_device *parent = &root;
+	for (i = 0; i < 6; i++) {
+		if (modpath->bc[i] == -1)
+			continue;
+		parent = alloc_tree_node(parent, modpath->bc[i]);
+	}
+	return alloc_tree_node(parent, modpath->mod);
+}
+
+struct parisc_device *
+alloc_pa_dev(unsigned long hpa, struct hardware_path *mod_path)
+{
 	int status;
+	unsigned long bytecnt;
+	u8 iodc_data[32];
+	struct parisc_device *dev;
+	const char *name;
+
+	/* Check to make sure this device has not already been added - Ryan */
+	if (find_device_by_addr(hpa) != NULL)
+		return NULL;
+
+	status = pdc_iodc_read(&bytecnt, hpa, 0, &iodc_data, 32);
+	if (status != PDC_OK)
+		return NULL;
+
+	dev = find_parisc_device(mod_path);
+	if (dev->id.hw_type != HPHW_FAULTY) {
+		char p[64];
+		print_pa_hwpath(dev, p);
+		printk("Two devices have hardware path %s.  Please file a bug with HP.\n"
+			"In the meantime, you could try rearranging your cards.\n", p);
+		return NULL;
+	}
+
+	dev->id.hw_type = iodc_data[3] & 0x1f;
+	dev->id.hversion = (iodc_data[0] << 4) | ((iodc_data[1] & 0xf0) >> 4);
+	dev->id.hversion_rev = iodc_data[1] & 0x0f;
+	dev->id.sversion = ((iodc_data[4] & 0x0f) << 16) |
+			(iodc_data[5] << 8) | iodc_data[6];
+	dev->hpa = hpa;
+	name = parisc_hardware_description(&dev->id);
+	if (name) {
+		strncpy(dev->name, name, sizeof(dev->name)-1);
+	}
+
+	return dev;
+}
 
-	d = &devices[num_devices];
-	status = pdc_iodc_read(&pdc_result,hpa,0,&iodc_data,32 );
-	if (status !=PDC_RET_OK) {
-		/* There is no device here, so we'll skip it */
+/**
+ * register_parisc_device - Locate a driver to manage this device.
+ * @dev: The parisc device.
+ *
+ * Search the driver list for a driver that is willing to manage
+ * this device.
+ */
+int register_parisc_device(struct parisc_device *dev)
+{
+	struct parisc_driver *driver;
+
+	if (!dev)
 		return 0;
+
+	if (dev->driver)
+		return 1;
+	
+	spin_lock(&pa_lock);
+
+	/* Locate a driver which agrees to manage this device.  */
+	for (driver = pa_drivers; driver; driver = driver->next) {
+		if (!match_device(driver,dev))
+			continue;
+		if (driver->probe(dev) == 0)
+			break;
 	}
 
-	d->hw_type = iodc_data[3]&0x1f;
-	d->hversion = (iodc_data[0]<<4)|((iodc_data[1]&0xf0)>>4);
-	d->sversion = 
-		((iodc_data[4]&0x0f)<<16)|(iodc_data[5]<<8)|(iodc_data[6]);
-	d->hversion_rev = iodc_data[1]&0x0f;
-	d->sversion_rev = iodc_data[4]>>4;
-	d->opt = iodc_data[7];
-	d->hpa = hpa;
-	d->managed=0;
-	d->reference = parisc_get_reference(d->hw_type, d->hversion, 
-								d->sversion);
-		
-	num_devices++;	
+	if (driver != NULL) {
+		claim_device(driver, dev);
+	}
+	spin_unlock(&pa_lock);
+	return driver != NULL;
+}
+
+#define BC_PORT_MASK 0x8
+#define BC_LOWER_PORT 0x8
+
+#define BUS_CONVERTER(dev) \
+        ((dev->id.hw_type == HPHW_IOA) || (dev->id.hw_type == HPHW_BCPORT))
+
+#define IS_LOWER_PORT(dev) \
+        ((gsc_readl(&((struct bc_module *)dev->hpa)->io_status) \
+                & BC_PORT_MASK) == BC_LOWER_PORT)
+
+#define READ_IO_IO_LOW(dev) \
+	(dev->id.hw_type == HPHW_IOA ? \
+	        __raw_readl((unsigned long)&((struct bc_module *)dev->hpa)->io_io_low) << 16 : \
+	        __raw_readl((unsigned long)&((struct bc_module *)dev->hpa)->io_io_low))
 
-	return d;
-}	
+static void walk_native_bus(unsigned long addr, struct parisc_device *parent);
+void walk_lower_bus(struct parisc_device *dev)
+{
+
+	if(!BUS_CONVERTER(dev) || IS_LOWER_PORT(dev))
+		return;
 
-void print_devices(char * buf) {
+	walk_native_bus((unsigned long)(signed int)READ_IO_IO_LOW(dev), dev);
+}
 
+#define MAX_NATIVE_DEVICES 64
+#define NATIVE_DEVICE_OFFSET 0x1000
+
+/**
+ * walk_native_bus -- Probe a bus for devices
+ * @addr: Base address of this bus.
+ * 
+ * A native bus (eg Runway or GSC) may have up to 64 devices on it,
+ * spaced at intervals of 0x1000 bytes.  PDC may not inform us of these
+ * devices, so we have to probe for them.  Unfortunately, we may find
+ * devices which are not physically connected (such as extra serial &
+ * keyboard ports).  This problem is not yet solved.
+ */
+static void walk_native_bus(unsigned long addr, struct parisc_device *parent)
+{
 	int i;
-	struct hp_device *d;
-	printk("Found devices:\n");
-	for (i=0;i<num_devices;i++) {	
-		d = &devices[i];
-		printk(KERN_INFO 
-		"%d. %s (%d) at 0x%p, versions 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", 
-		i+1,
-		(d->reference) ? d->reference->name : "Unknown device",
-		d->hw_type,d->hpa, d->hversion, d->hversion_rev,
-		d->sversion, d->sversion_rev, d->opt);
+	struct hardware_path path;
+
+	get_node_path(parent, &path);
+	for (i = 0; i < MAX_NATIVE_DEVICES; i++) {
+		unsigned long hpa = (addr + i * NATIVE_DEVICE_OFFSET);
+		struct parisc_device *dev;
+
+		/* Was the device already added by Firmware? */
+		dev = find_device_by_addr(hpa);
+		if (!dev) {
+			path.mod = i;
+			dev = alloc_pa_dev(hpa, &path);
+			if (!dev)
+				continue;
+
+			register_parisc_device(dev);
+		}
+		walk_lower_bus(dev);
+	}
+}
+
+#define CENTRAL_BUS_ADDR (unsigned long) 0xfffffffffff80000
+
+/**
+ * walk_central_bus - Find devices attached to the central bus
+ *
+ * PDC doesn't tell us about all devices in the system.  This routine
+ * finds devices connected to the central bus.
+ */
+void walk_central_bus(void)
+{
+	walk_native_bus(CENTRAL_BUS_ADDR, &root);
+}
+
+void fixup_child_irqs(struct parisc_device *parent, int base,
+			int (*choose_irq)(struct parisc_device *))
+{
+	struct parisc_device *dev;
 
+	if (!parent->child)
+		return;
+
+	for (dev = check_dev(parent->child); dev; dev = dev->sibling) {
+		int irq = choose_irq(dev);
+		if (irq > 0) {
+#ifdef __LP64__
+			irq += 32;
+#endif
+			dev->irq = base + irq;
+		}
 	}
-	printk("That's a total of %d devices.\n",num_devices);
 }
 
+static void print_parisc_device(struct parisc_device *dev)
+{
+	char hw_path[64];
+	static int count;
 
+	print_pa_hwpath(dev, hw_path);
+	printk(KERN_INFO "%d. %s (%d) at 0x%lx [%s], versions 0x%x, 0x%x, 0x%x",
+		++count, dev->name, dev->id.hw_type, dev->hpa, hw_path,
+		dev->id.hversion, dev->id.hversion_rev, dev->id.sversion);
+
+	if (dev->num_addrs) {
+		int k;
+		printk(",  additional addresses: ");
+		for (k = 0; k < dev->num_addrs; k++)
+			printk("0x%lx ", dev->addr[k]);
+	}
+	printk("\n");
+}
+
+void print_subdevices(struct parisc_device *parent)
+{
+	struct parisc_device *dev;
+	for (dev = parent->child; dev != parent->sibling; dev = next_dev(dev)) {
+		print_parisc_device(dev);
+	}
+}
+
+/**
+ * print_parisc_devices - Print out a list of devices found in this system
+ */
+void print_parisc_devices(void)
+{
+	struct parisc_device *dev;
+	for_each_padev(dev) {
+		print_parisc_device(dev);
+	}
+}