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/*
* 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
*
* 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>
/* See comments in include/asm-parisc/pci.h */
struct pci_dma_ops *hppa_dma_ops;
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;
#define for_each_padev(dev) \
for (dev = root.child; dev != NULL; dev = next_dev(dev))
#define check_dev(dev) \
(dev->id.hw_type != HPHW_FAULTY) ? dev : next_dev(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.
*/
struct parisc_device *next_dev(struct parisc_device *dev)
{
if (dev->child) {
return check_dev(dev->child);
} else if (dev->sibling) {
return dev->sibling;
}
/* Exhausted tree at this level, time to go up. */
do {
dev = dev->parent;
if (dev && dev->sibling)
return dev->sibling;
} while (dev != &root);
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);
}
/**
* 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;
}
/**
* 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;
}
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;
}
/**
* 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;
}
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 IO_STATUS offsetof(struct bc_module, io_status)
#define BUS_CONVERTER(dev) \
((dev->id.hw_type == HPHW_IOA) || (dev->id.hw_type == HPHW_BCPORT))
#define IS_LOWER_PORT(dev) \
((__raw_readl(dev->hpa + IO_STATUS) & BC_PORT_MASK) == BC_LOWER_PORT)
#define MAX_NATIVE_DEVICES 64
#define NATIVE_DEVICE_OFFSET 0x1000
#define FLEX_MASK (unsigned long)0xfffffffffffc0000
#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)__raw_readl(dev->hpa + IO_IO_LOW)
#define READ_IO_IO_HIGH(dev) (unsigned long)(signed int)__raw_readl(dev->hpa + IO_IO_HIGH)
static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
struct parisc_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);
}
/**
* 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 parisc_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 (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,
CENTRAL_BUS_ADDR + (MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET),
&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;
}
}
}
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);
}
}