/* * 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> * Copyright (c) 2001,2002 Ryan Bradetich  * Copyright (c) 2004-2005 Thibaut VARENE <varenet@parisc-linux.org> *  * The file handles registering devices and drivers, then matching them. * It's the closest we get to a dating agency. * * If you're thinking about modifying this file, here are some gotchas to * bear in mind: *  - 715/Mirage device paths have a dummy device between Lasi and its children *  - The EISA adapter may show up as a sibling or child of Wax *  - Dino has an optionally functional serial port.  If firmware enables it, *    it shows up as a child of Dino.  If firmware disables it, the buswalk *    finds it and it shows up as a child of Cujo *  - Dino has both parisc and pci devices as children *  - parisc devices are discovered in a random order, including children *    before parents in some cases. */#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/parisc-device.h>/* See comments in include/asm-parisc/pci.h */struct hppa_dma_ops *hppa_dma_ops;EXPORT_SYMBOL(hppa_dma_ops);static struct device root = {	.bus_id = "parisc",};#define for_each_padev(padev) \	for (padev = next_dev(&root); padev != NULL; \			padev = next_dev(&padev->dev))#define check_dev(padev) \	(padev->id.hw_type != HPHW_FAULTY) ? padev : next_dev(&padev->dev)/** * 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. */static struct parisc_device *next_dev(struct device *dev){	if (!list_empty(&dev->children)) {		dev = list_to_dev(dev->children.next);		return check_dev(to_parisc_device(dev));	}	while (dev != &root) {		if (dev->node.next != &dev->parent->children) {			dev = list_to_dev(dev->node.next);			return to_parisc_device(dev);		}		dev = dev->parent;	}	return NULL;}/** * match_device - Report whether this driver can handle this device * @driver: the PA-RISC driver to try * @dev: the PA-RISC device to try */static int match_device(struct parisc_driver *driver, struct parisc_device *dev){	const struct parisc_device_id *ids;	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;		return 1;	}	return 0;}static void claim_device(struct parisc_driver *driver, struct parisc_device *dev){	dev->driver = driver;	request_mem_region(dev->hpa, 0x1000, driver->name);}static int parisc_driver_probe(struct device *dev){	int rc;	struct parisc_device *pa_dev = to_parisc_device(dev);	struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);	rc = pa_drv->probe(pa_dev);	if(!rc)		claim_device(pa_drv, pa_dev);	return rc;}static int parisc_driver_remove(struct device *dev){	struct parisc_device *pa_dev = to_parisc_device(dev);	struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);	if (pa_drv->remove)		pa_drv->remove(pa_dev);	release_mem_region(pa_dev->hpa, 0x1000);	return 0;}	/** * 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){	/* FIXME: we need this because apparently the sti	 * driver can be registered twice */	if(driver->drv.name) {		printk(KERN_WARNING 		       "BUG: skipping previously registered driver %s\n",		       driver->name);		return 1;	}	if (!driver->probe) {		printk(KERN_WARNING 		       "BUG: driver %s has no probe routine\n",		       driver->name);		return 1;	}	driver->drv.bus = &parisc_bus_type;	/* We install our own probe and remove routines */	WARN_ON(driver->drv.probe != NULL);	WARN_ON(driver->drv.remove != NULL);	driver->drv.probe = parisc_driver_probe;	driver->drv.remove = parisc_driver_remove;	driver->drv.name = driver->name;	return driver_register(&driver->drv);}EXPORT_SYMBOL(register_parisc_driver);/** * 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){	driver_unregister(&driver->drv);	return 0;}EXPORT_SYMBOL(unregister_parisc_driver);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;}/** * 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 *padev, int type){	const struct device *dev = &padev->dev;	while (dev != &root) {		struct parisc_device *candidate = to_parisc_device(dev);		if (candidate->id.hw_type == type)			return candidate;		dev = dev->parent;	}	return NULL;}#ifdef CONFIG_PCIstatic inline int is_pci_dev(struct device *dev){	return dev->bus == &pci_bus_type;}#elsestatic inline int is_pci_dev(struct device *dev){	return 0;}#endif/* * get_node_path fills in @path with the firmware path to the device. * Note that if @node is a parisc device, we don't fill in the 'mod' field. * This is because both callers pass the parent and fill in the mod * themselves.  If @node is a PCI device, we do fill it in, even though this * is inconsistent. */static void get_node_path(struct device *dev, struct hardware_path *path){	int i = 5;	memset(&path->bc, -1, 6);	if (is_pci_dev(dev)) {		unsigned int devfn = to_pci_dev(dev)->devfn;		path->mod = PCI_FUNC(devfn);		path->bc[i--] = PCI_SLOT(devfn);		dev = dev->parent;	}	while (dev != &root) {		if (is_pci_dev(dev)) {			unsigned int devfn = to_pci_dev(dev)->devfn;			path->bc[i--] = PCI_SLOT(devfn) | (PCI_FUNC(devfn)<< 5);		} else if (dev->bus == &parisc_bus_type) {			path->bc[i--] = to_parisc_device(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->dev.parent, &path);	path.mod = dev->hw_path;	return print_hwpath(&path, output);}EXPORT_SYMBOL(print_pa_hwpath);#if defined(CONFIG_PCI) || defined(CONFIG_ISA)/** * get_pci_node_path - Determines the hardware path for a PCI device * @pdev: The device to return the path for * @path: 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 *pdev, struct hardware_path *path){	get_node_path(&pdev->dev, path);}EXPORT_SYMBOL(get_pci_node_path);/** * 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);}EXPORT_SYMBOL(print_pci_hwpath);#endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */static void setup_bus_id(struct parisc_device *padev){	struct hardware_path path;	char *output = padev->dev.bus_id;	int i;	get_node_path(padev->dev.parent, &path);	for (i = 0; i < 6; i++) {		if (path.bc[i] == -1)			continue;		output += sprintf(output, "%u:", (unsigned char) path.bc[i]);	}	sprintf(output, "%u", (unsigned char) padev->hw_path);}struct parisc_device * create_tree_node(char id, struct device *parent){	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->dev.parent = parent;	setup_bus_id(dev);	dev->dev.bus = &parisc_bus_type;	dev->dma_mask = 0xffffffffUL;	/* PARISC devices are 32-bit */	/* make the generic dma mask a pointer to the parisc one */	dev->dev.dma_mask = &dev->dma_mask;