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Diffstat (limited to 'arch/parisc/kernel/drivers.c')
| -rw-r--r-- | arch/parisc/kernel/drivers.c | 765 |
1 files changed, 765 insertions, 0 deletions
diff --git a/arch/parisc/kernel/drivers.c b/arch/parisc/kernel/drivers.c new file mode 100644 index 00000000000..ebf186656af --- /dev/null +++ b/arch/parisc/kernel/drivers.c @@ -0,0 +1,765 @@ +/* + * 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_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, 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); + } +} |