/* * 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 * Copyright (c) 2001,2002 Ryan Bradetich * Copyright (c) 2004-2005 Thibaut VARENE * * 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 #include #include #include #include #include #include #include #include #include /* 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_PCI static inline int is_pci_dev(struct device *dev) { return dev->bus == &pci_bus_type; } #else static 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; dev->dev.coherent_dma_mask = dev->dma_mask; device_register(&dev->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. */ static struct parisc_device * alloc_tree_node(struct device *parent, char id) { struct device *dev; list_for_each_entry(dev, &parent->children, node) { struct parisc_device *padev = to_parisc_device(dev); if (padev->hw_path == id) return padev; } return create_tree_node(id, parent); } static struct parisc_device *create_parisc_device(struct hardware_path *modpath) { int i; struct device *parent = &root; for (i = 0; i < 6; i++) { if (modpath->bc[i] == -1) continue; parent = &alloc_tree_node(parent, modpath->bc[i])->dev; } 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 = create_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) { strlcpy(dev->name, name, sizeof(dev->name)); } return dev; } static int parisc_generic_match(struct device *dev, struct device_driver *drv) { return match_device(to_parisc_driver(drv), to_parisc_device(dev)); } #define pa_dev_attr(name, field, format_string) \ static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf) \ { \ struct parisc_device *padev = to_parisc_device(dev); \ return sprintf(buf, format_string, padev->field); \ } #define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format) pa_dev_attr(irq, irq, "%u\n"); pa_dev_attr_id(hw_type, "0x%02x\n"); pa_dev_attr(rev, id.hversion_rev, "0x%x\n"); pa_dev_attr_id(hversion, "0x%03x\n"); pa_dev_attr_id(sversion, "0x%05x\n"); static struct device_attribute parisc_device_attrs[] = { __ATTR_RO(irq), __ATTR_RO(hw_type), __ATTR_RO(rev), __ATTR_RO(hversion), __ATTR_RO(sversion), __ATTR_NULL, }; struct bus_type parisc_bus_type = { .name = "parisc", .match = parisc_generic_match, .dev_attrs = parisc_device_attrs, }; /** * 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) { if (!dev) return 0; if (dev->driver) return 1; return 0; } /** * match_pci_device - Matches a pci device against a given hardware path * entry. * @dev: the generic device (known to be contained by a pci_dev). * @index: the current BC index * @modpath: the hardware path. * @return: true if the device matches the hardware path. */ static int match_pci_device(struct device *dev, int index, struct hardware_path *modpath) { struct pci_dev *pdev = to_pci_dev(dev); int id; if (index == 5) { /* we are at the end of the path, and on the actual device */ unsigned int devfn = pdev->devfn; return ((modpath->bc[5] == PCI_SLOT(devfn)) && (modpath->mod == PCI_FUNC(devfn))); } id = PCI_SLOT(pdev->devfn) | (PCI_FUNC(pdev->devfn) << 5); return (modpath->bc[index] == id); } /** * match_parisc_device - Matches a parisc device against a given hardware * path entry. * @dev: the generic device (known to be contained by a parisc_device). * @index: the current BC index * @modpath: the hardware path. * @return: true if the device matches the hardware path. */ static int match_parisc_device(struct device *dev, int index, struct hardware_path *modpath) { struct parisc_device *curr = to_parisc_device(dev); char id = (index == 6) ? modpath->mod : modpath->bc[index]; return (curr->hw_path == id); } /** * parse_tree_node - returns a device entry in the iotree * @parent: the parent node in the tree * @index: the current BC index * @modpath: the hardware_path struct to match a device against * @return: The corresponding device if found, NULL otherwise. * * Checks all the children of @parent for a matching @id. If none * found, it returns NULL. */ static struct device * parse_tree_node(struct device *parent, int index, struct hardware_path *modpath) { struct device *device; list_for_each_entry(device, &parent->children, node) { if (device->bus == &parisc_bus_type) { if (match_parisc_device(device, index, modpath)) return device; } else if (is_pci_dev(device)) { if (match_pci_device(device, index, modpath)) return device; } else if (device->bus == NULL) { /* we are on a bus bridge */ struct device *new = parse_tree_node(device, index, modpath); if (new) return new; } } return NULL; } /** * hwpath_to_device - Finds the generic device corresponding to a given hardware path. * @modpath: the hardware path. * @return: The target device, NULL if not found. */ struct device *hwpath_to_device(struct hardware_path *modpath) { int i; struct device *parent = &root; for (i = 0; i < 6; i++) { if (modpath->bc[i] == -1) continue; parent = parse_tree_node(parent, i, modpath); if (!parent) return NULL; } if (is_pci_dev(parent)) /* pci devices already parse MOD */ return parent; else return parse_tree_node(parent, 6, modpath); } EXPORT_SYMBOL(hwpath_to_device); /** * device_to_hwpath - Populates the hwpath corresponding to the given device. * @param dev the target device * @param path pointer to a previously allocated hwpath struct to be filled in */ void device_to_hwpath(struct device *dev, struct hardware_path *path) { struct parisc_device *padev; if (dev->bus == &parisc_bus_type) { padev = to_parisc_device(dev); get_node_path(dev->parent, path); path->mod = padev->hw_path; } else if (is_pci_dev(dev)) { get_node_path(dev, path); } } EXPORT_SYMBOL(device_to_hwpath); #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(dev->hpa + offsetof(struct bc_module, io_status)) \ & BC_PORT_MASK) == BC_LOWER_PORT) #define MAX_NATIVE_DEVICES 64 #define NATIVE_DEVICE_OFFSET 0x1000 #define FLEX_MASK F_EXTEND(0xfffc0000) #define IO_IO_LOW offsetof(struct bc_module, io_io_low) #define IO_IO_HIGH offsetof(struct bc_module, io_io_high) #define READ_IO_IO_LOW(dev) (unsigned long)(signed int)gsc_readl(dev->hpa + IO_IO_LOW) #define READ_IO_IO_HIGH(dev) (unsigned long)(signed int)gsc_readl(dev->hpa + IO_IO_HIGH) static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high, struct device *parent); void walk_lower_bus(struct parisc_device *dev) { unsigned long io_io_low, io_io_high; if(!BUS_CONVERTER(dev) || IS_LOWER_PORT(dev)) return; if(dev->id.hw_type == HPHW_IOA) { io_io_low = (unsigned long)(signed int)(READ_IO_IO_LOW(dev) << 16); io_io_high = io_io_low + MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET; } else { io_io_low = (READ_IO_IO_LOW(dev) + ~FLEX_MASK) & FLEX_MASK; io_io_high = (READ_IO_IO_HIGH(dev)+ ~FLEX_MASK) & FLEX_MASK; } walk_native_bus(io_io_low, io_io_high, &dev->dev); } /** * walk_native_bus -- Probe a bus for devices * @io_io_low: Base address of this bus. * @io_io_high: Last address of this bus. * @parent: The parent bus device. * * 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 io_io_low, unsigned long io_io_high, struct device *parent) { int i, devices_found = 0; unsigned long hpa = io_io_low; struct hardware_path path; get_node_path(parent, &path); do { for(i = 0; i < MAX_NATIVE_DEVICES; i++, hpa += 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); devices_found++; } walk_lower_bus(dev); } } while(!devices_found && hpa < io_io_high); } #define CENTRAL_BUS_ADDR F_EXTEND(0xfff80000) /** * 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, CENTRAL_BUS_ADDR + (MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET), &root); } 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 at 0x%lx [%s] { %d, 0x%x, 0x%.3x, 0x%.5x }", ++count, dev->name, dev->hpa, hw_path, dev->id.hw_type, dev->id.hversion_rev, dev->id.hversion, 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"); } /** * init_parisc_bus - Some preparation to be done before inventory */ void init_parisc_bus(void) { bus_register(&parisc_bus_type); device_register(&root); get_device(&root); } /** * 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); } }