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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [acpi/] [pci_link.c] - Blame information for rev 67

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/*
 *  pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2002       Dominik Brodowski <devel@brodo.de>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * TBD:
 *      1. Support more than one IRQ resource entry per link device (index).
 *      2. Implement start/stop mechanism and use ACPI Bus Driver facilities
 *         for IRQ management (e.g. start()->_SRS).
 */
 
#include <linux/sysdev.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <linux/pci.h>
#include <linux/mutex.h>
 
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
 
#define _COMPONENT              ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_link");
#define ACPI_PCI_LINK_CLASS             "pci_irq_routing"
#define ACPI_PCI_LINK_DEVICE_NAME       "PCI Interrupt Link"
#define ACPI_PCI_LINK_FILE_INFO         "info"
#define ACPI_PCI_LINK_FILE_STATUS       "state"
#define ACPI_PCI_LINK_MAX_POSSIBLE 16
static int acpi_pci_link_add(struct acpi_device *device);
static int acpi_pci_link_remove(struct acpi_device *device, int type);
 
static struct acpi_device_id link_device_ids[] = {
        {"PNP0C0F", 0},
        {"", 0},
};
MODULE_DEVICE_TABLE(acpi, link_device_ids);
 
static struct acpi_driver acpi_pci_link_driver = {
        .name = "pci_link",
        .class = ACPI_PCI_LINK_CLASS,
        .ids = link_device_ids,
        .ops = {
                .add = acpi_pci_link_add,
                .remove = acpi_pci_link_remove,
                },
};
 
/*
 * If a link is initialized, we never change its active and initialized
 * later even the link is disable. Instead, we just repick the active irq
 */
struct acpi_pci_link_irq {
        u8 active;              /* Current IRQ */
        u8 triggering;          /* All IRQs */
        u8 polarity;    /* All IRQs */
        u8 resource_type;
        u8 possible_count;
        u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
        u8 initialized:1;
        u8 reserved:7;
};
 
struct acpi_pci_link {
        struct list_head node;
        struct acpi_device *device;
        struct acpi_pci_link_irq irq;
        int refcnt;
};
 
static struct {
        int count;
        struct list_head entries;
} acpi_link;
DEFINE_MUTEX(acpi_link_lock);
 
/* --------------------------------------------------------------------------
                            PCI Link Device Management
   -------------------------------------------------------------------------- */
 
/*
 * set context (link) possible list from resource list
 */
static acpi_status
acpi_pci_link_check_possible(struct acpi_resource *resource, void *context)
{
        struct acpi_pci_link *link = context;
        u32 i = 0;
 
 
        switch (resource->type) {
        case ACPI_RESOURCE_TYPE_START_DEPENDENT:
                return AE_OK;
        case ACPI_RESOURCE_TYPE_IRQ:
                {
                        struct acpi_resource_irq *p = &resource->data.irq;
                        if (!p || !p->interrupt_count) {
                                printk(KERN_WARNING PREFIX "Blank IRQ resource\n");
                                return AE_OK;
                        }
                        for (i = 0;
                             (i < p->interrupt_count
                              && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
                                if (!p->interrupts[i]) {
                                        printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
                                                      p->interrupts[i]);
                                        continue;
                                }
                                link->irq.possible[i] = p->interrupts[i];
                                link->irq.possible_count++;
                        }
                        link->irq.triggering = p->triggering;
                        link->irq.polarity = p->polarity;
                        link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
                        break;
                }
        case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
                {
                        struct acpi_resource_extended_irq *p =
                            &resource->data.extended_irq;
                        if (!p || !p->interrupt_count) {
                                printk(KERN_WARNING PREFIX
                                              "Blank EXT IRQ resource\n");
                                return AE_OK;
                        }
                        for (i = 0;
                             (i < p->interrupt_count
                              && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
                                if (!p->interrupts[i]) {
                                        printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
                                                      p->interrupts[i]);
                                        continue;
                                }
                                link->irq.possible[i] = p->interrupts[i];
                                link->irq.possible_count++;
                        }
                        link->irq.triggering = p->triggering;
                        link->irq.polarity = p->polarity;
                        link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
                        break;
                }
        default:
                printk(KERN_ERR PREFIX "Resource is not an IRQ entry\n");
                return AE_OK;
        }
 
        return AE_CTRL_TERMINATE;
}
 
static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
{
        acpi_status status;
 
 
        if (!link)
                return -EINVAL;
 
        status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
                                     acpi_pci_link_check_possible, link);
        if (ACPI_FAILURE(status)) {
                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
                return -ENODEV;
        }
 
        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Found %d possible IRQs\n",
                          link->irq.possible_count));
 
        return 0;
}
 
static acpi_status
acpi_pci_link_check_current(struct acpi_resource *resource, void *context)
{
        int *irq = (int *)context;
 
 
        switch (resource->type) {
        case ACPI_RESOURCE_TYPE_IRQ:
                {
                        struct acpi_resource_irq *p = &resource->data.irq;
                        if (!p || !p->interrupt_count) {
                                /*
                                 * IRQ descriptors may have no IRQ# bits set,
                                 * particularly those those w/ _STA disabled
                                 */
                                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                                  "Blank IRQ resource\n"));
                                return AE_OK;
                        }
                        *irq = p->interrupts[0];
                        break;
                }
        case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
                {
                        struct acpi_resource_extended_irq *p =
                            &resource->data.extended_irq;
                        if (!p || !p->interrupt_count) {
                                /*
                                 * extended IRQ descriptors must
                                 * return at least 1 IRQ
                                 */
                                printk(KERN_WARNING PREFIX
                                              "Blank EXT IRQ resource\n");
                                return AE_OK;
                        }
                        *irq = p->interrupts[0];
                        break;
                }
                break;
        default:
                printk(KERN_ERR PREFIX "Resource %d isn't an IRQ\n", resource->type);
        case ACPI_RESOURCE_TYPE_END_TAG:
                return AE_OK;
        }
        return AE_CTRL_TERMINATE;
}
 
/*
 * Run _CRS and set link->irq.active
 *
 * return value:
 * 0 - success
 * !0 - failure
 */
static int acpi_pci_link_get_current(struct acpi_pci_link *link)
{
        int result = 0;
        acpi_status status = AE_OK;
        int irq = 0;
 
        if (!link)
                return -EINVAL;
 
        link->irq.active = 0;
 
        /* in practice, status disabled is meaningless, ignore it */
        if (acpi_strict) {
                /* Query _STA, set link->device->status */
                result = acpi_bus_get_status(link->device);
                if (result) {
                        printk(KERN_ERR PREFIX "Unable to read status\n");
                        goto end;
                }
 
                if (!link->device->status.enabled) {
                        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
                        return 0;
                }
        }
 
        /*
         * Query and parse _CRS to get the current IRQ assignment.
         */
 
        status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
                                     acpi_pci_link_check_current, &irq);
        if (ACPI_FAILURE(status)) {
                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
                result = -ENODEV;
                goto end;
        }
 
        if (acpi_strict && !irq) {
                printk(KERN_ERR PREFIX "_CRS returned 0\n");
                result = -ENODEV;
        }
 
        link->irq.active = irq;
 
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
 
      end:
        return result;
}
 
static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
{
        int result = 0;
        acpi_status status = AE_OK;
        struct {
                struct acpi_resource res;
                struct acpi_resource end;
        } *resource;
        struct acpi_buffer buffer = { 0, NULL };
 
 
        if (!link || !irq)
                return -EINVAL;
 
        resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
        if (!resource)
                return -ENOMEM;
 
        buffer.length = sizeof(*resource) + 1;
        buffer.pointer = resource;
 
        switch (link->irq.resource_type) {
        case ACPI_RESOURCE_TYPE_IRQ:
                resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
                resource->res.length = sizeof(struct acpi_resource);
                resource->res.data.irq.triggering = link->irq.triggering;
                resource->res.data.irq.polarity =
                    link->irq.polarity;
                if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
                        resource->res.data.irq.sharable =
                            ACPI_EXCLUSIVE;
                else
                        resource->res.data.irq.sharable = ACPI_SHARED;
                resource->res.data.irq.interrupt_count = 1;
                resource->res.data.irq.interrupts[0] = irq;
                break;
 
        case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
                resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
                resource->res.length = sizeof(struct acpi_resource);
                resource->res.data.extended_irq.producer_consumer =
                    ACPI_CONSUMER;
                resource->res.data.extended_irq.triggering =
                    link->irq.triggering;
                resource->res.data.extended_irq.polarity =
                    link->irq.polarity;
                if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
                        resource->res.data.irq.sharable =
                            ACPI_EXCLUSIVE;
                else
                        resource->res.data.irq.sharable = ACPI_SHARED;
                resource->res.data.extended_irq.interrupt_count = 1;
                resource->res.data.extended_irq.interrupts[0] = irq;
                /* ignore resource_source, it's optional */
                break;
        default:
                printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
                result = -EINVAL;
                goto end;
 
        }
        resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
 
        /* Attempt to set the resource */
        status = acpi_set_current_resources(link->device->handle, &buffer);
 
        /* check for total failure */
        if (ACPI_FAILURE(status)) {
                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
                result = -ENODEV;
                goto end;
        }
 
        /* Query _STA, set device->status */
        result = acpi_bus_get_status(link->device);
        if (result) {
                printk(KERN_ERR PREFIX "Unable to read status\n");
                goto end;
        }
        if (!link->device->status.enabled) {
                printk(KERN_WARNING PREFIX
                              "%s [%s] disabled and referenced, BIOS bug\n",
                              acpi_device_name(link->device),
                              acpi_device_bid(link->device));
        }
 
        /* Query _CRS, set link->irq.active */
        result = acpi_pci_link_get_current(link);
        if (result) {
                goto end;
        }
 
        /*
         * Is current setting not what we set?
         * set link->irq.active
         */
        if (link->irq.active != irq) {
                /*
                 * policy: when _CRS doesn't return what we just _SRS
                 * assume _SRS worked and override _CRS value.
                 */
                printk(KERN_WARNING PREFIX
                              "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
                              acpi_device_name(link->device),
                              acpi_device_bid(link->device), link->irq.active, irq);
                link->irq.active = irq;
        }
 
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
 
      end:
        kfree(resource);
        return result;
}
 
/* --------------------------------------------------------------------------
                            PCI Link IRQ Management
   -------------------------------------------------------------------------- */
 
/*
 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
 * Link Devices to move the PIRQs around to minimize sharing.
 *
 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
 * that the BIOS has already set to active.  This is necessary because
 * ACPI has no automatic means of knowing what ISA IRQs are used.  Note that
 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
 * even if acpi_irq_nobalance is set.
 *
 * A tables of penalties avoids directing PCI interrupts to well known
 * ISA IRQs. Boot params are available to over-ride the default table:
 *
 * List interrupts that are free for PCI use.
 * acpi_irq_pci=n[,m]
 *
 * List interrupts that should not be used for PCI:
 * acpi_irq_isa=n[,m]
 *
 * Note that PCI IRQ routers have a list of possible IRQs,
 * which may not include the IRQs this table says are available.
 *
 * Since this heuristic can't tell the difference between a link
 * that no device will attach to, vs. a link which may be shared
 * by multiple active devices -- it is not optimal.
 *
 * If interrupt performance is that important, get an IO-APIC system
 * with a pin dedicated to each device.  Or for that matter, an MSI
 * enabled system.
 */
 
#define ACPI_MAX_IRQS           256
#define ACPI_MAX_ISA_IRQ        16
 
#define PIRQ_PENALTY_PCI_AVAILABLE      (0)
#define PIRQ_PENALTY_PCI_POSSIBLE       (16*16)
#define PIRQ_PENALTY_PCI_USING          (16*16*16)
#define PIRQ_PENALTY_ISA_TYPICAL        (16*16*16*16)
#define PIRQ_PENALTY_ISA_USED           (16*16*16*16*16)
#define PIRQ_PENALTY_ISA_ALWAYS         (16*16*16*16*16*16)
 
static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
        PIRQ_PENALTY_ISA_ALWAYS,        /* IRQ0 timer */
        PIRQ_PENALTY_ISA_ALWAYS,        /* IRQ1 keyboard */
        PIRQ_PENALTY_ISA_ALWAYS,        /* IRQ2 cascade */
        PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ3 serial */
        PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ4 serial */
        PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ5 sometimes SoundBlaster */
        PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ6 */
        PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ7 parallel, spurious */
        PIRQ_PENALTY_ISA_TYPICAL,       /* IRQ8 rtc, sometimes */
        PIRQ_PENALTY_PCI_AVAILABLE,     /* IRQ9  PCI, often acpi */
        PIRQ_PENALTY_PCI_AVAILABLE,     /* IRQ10 PCI */
        PIRQ_PENALTY_PCI_AVAILABLE,     /* IRQ11 PCI */
        PIRQ_PENALTY_ISA_USED,  /* IRQ12 mouse */
        PIRQ_PENALTY_ISA_USED,  /* IRQ13 fpe, sometimes */
        PIRQ_PENALTY_ISA_USED,  /* IRQ14 ide0 */
        PIRQ_PENALTY_ISA_USED,  /* IRQ15 ide1 */
        /* >IRQ15 */
};
 
int __init acpi_irq_penalty_init(void)
{
        struct list_head *node = NULL;
        struct acpi_pci_link *link = NULL;
        int i = 0;
 
 
        /*
         * Update penalties to facilitate IRQ balancing.
         */
        list_for_each(node, &acpi_link.entries) {
 
                link = list_entry(node, struct acpi_pci_link, node);
                if (!link) {
                        printk(KERN_ERR PREFIX "Invalid link context\n");
                        continue;
                }
 
                /*
                 * reflect the possible and active irqs in the penalty table --
                 * useful for breaking ties.
                 */
                if (link->irq.possible_count) {
                        int penalty =
                            PIRQ_PENALTY_PCI_POSSIBLE /
                            link->irq.possible_count;
 
                        for (i = 0; i < link->irq.possible_count; i++) {
                                if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
                                        acpi_irq_penalty[link->irq.
                                                         possible[i]] +=
                                            penalty;
                        }
 
                } else if (link->irq.active) {
                        acpi_irq_penalty[link->irq.active] +=
                            PIRQ_PENALTY_PCI_POSSIBLE;
                }
        }
        /* Add a penalty for the SCI */
        acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING;
 
        return 0;
}
 
static int acpi_irq_balance;    /* 0: static, 1: balance */
 
static int acpi_pci_link_allocate(struct acpi_pci_link *link)
{
        int irq;
        int i;
 
 
        if (link->irq.initialized) {
                if (link->refcnt == 0)
                        /* This means the link is disabled but initialized */
                        acpi_pci_link_set(link, link->irq.active);
                return 0;
        }
 
        /*
         * search for active IRQ in list of possible IRQs.
         */
        for (i = 0; i < link->irq.possible_count; ++i) {
                if (link->irq.active == link->irq.possible[i])
                        break;
        }
        /*
         * forget active IRQ that is not in possible list
         */
        if (i == link->irq.possible_count) {
                if (acpi_strict)
                        printk(KERN_WARNING PREFIX "_CRS %d not found"
                                      " in _PRS\n", link->irq.active);
                link->irq.active = 0;
        }
 
        /*
         * if active found, use it; else pick entry from end of possible list.
         */
        if (link->irq.active) {
                irq = link->irq.active;
        } else {
                irq = link->irq.possible[link->irq.possible_count - 1];
        }
 
        if (acpi_irq_balance || !link->irq.active) {
                /*
                 * Select the best IRQ.  This is done in reverse to promote
                 * the use of IRQs 9, 10, 11, and >15.
                 */
                for (i = (link->irq.possible_count - 1); i >= 0; i--) {
                        if (acpi_irq_penalty[irq] >
                            acpi_irq_penalty[link->irq.possible[i]])
                                irq = link->irq.possible[i];
                }
        }
 
        /* Attempt to enable the link device at this IRQ. */
        if (acpi_pci_link_set(link, irq)) {
                printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
                            "Try pci=noacpi or acpi=off\n",
                            acpi_device_name(link->device),
                            acpi_device_bid(link->device));
                return -ENODEV;
        } else {
                acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
                printk(PREFIX "%s [%s] enabled at IRQ %d\n",
                       acpi_device_name(link->device),
                       acpi_device_bid(link->device), link->irq.active);
        }
 
        link->irq.initialized = 1;
 
        return 0;
}
 
/*
 * acpi_pci_link_allocate_irq
 * success: return IRQ >= 0
 * failure: return -1
 */
 
int
acpi_pci_link_allocate_irq(acpi_handle handle,
                           int index,
                           int *triggering, int *polarity, char **name)
{
        int result = 0;
        struct acpi_device *device = NULL;
        struct acpi_pci_link *link = NULL;
 
 
        result = acpi_bus_get_device(handle, &device);
        if (result) {
                printk(KERN_ERR PREFIX "Invalid link device\n");
                return -1;
        }
 
        link = acpi_driver_data(device);
        if (!link) {
                printk(KERN_ERR PREFIX "Invalid link context\n");
                return -1;
        }
 
        /* TBD: Support multiple index (IRQ) entries per Link Device */
        if (index) {
                printk(KERN_ERR PREFIX "Invalid index %d\n", index);
                return -1;
        }
 
        mutex_lock(&acpi_link_lock);
        if (acpi_pci_link_allocate(link)) {
                mutex_unlock(&acpi_link_lock);
                return -1;
        }
 
        if (!link->irq.active) {
                mutex_unlock(&acpi_link_lock);
                printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
                return -1;
        }
        link->refcnt++;
        mutex_unlock(&acpi_link_lock);
 
        if (triggering)
                *triggering = link->irq.triggering;
        if (polarity)
                *polarity = link->irq.polarity;
        if (name)
                *name = acpi_device_bid(link->device);
        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Link %s is referenced\n",
                          acpi_device_bid(link->device)));
        return (link->irq.active);
}
 
/*
 * We don't change link's irq information here.  After it is reenabled, we
 * continue use the info
 */
int acpi_pci_link_free_irq(acpi_handle handle)
{
        struct acpi_device *device = NULL;
        struct acpi_pci_link *link = NULL;
        acpi_status result;
 
 
        result = acpi_bus_get_device(handle, &device);
        if (result) {
                printk(KERN_ERR PREFIX "Invalid link device\n");
                return -1;
        }
 
        link = acpi_driver_data(device);
        if (!link) {
                printk(KERN_ERR PREFIX "Invalid link context\n");
                return -1;
        }
 
        mutex_lock(&acpi_link_lock);
        if (!link->irq.initialized) {
                mutex_unlock(&acpi_link_lock);
                printk(KERN_ERR PREFIX "Link isn't initialized\n");
                return -1;
        }
#ifdef  FUTURE_USE
        /*
         * The Link reference count allows us to _DISable an unused link
         * and suspend time, and set it again  on resume.
         * However, 2.6.12 still has irq_router.resume
         * which blindly restores the link state.
         * So we disable the reference count method
         * to prevent duplicate acpi_pci_link_set()
         * which would harm some systems
         */
        link->refcnt--;
#endif
        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Link %s is dereferenced\n",
                          acpi_device_bid(link->device)));
 
        if (link->refcnt == 0) {
                acpi_ut_evaluate_object(link->device->handle, "_DIS", 0, NULL);
        }
        mutex_unlock(&acpi_link_lock);
        return (link->irq.active);
}
 
/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */
 
static int acpi_pci_link_add(struct acpi_device *device)
{
        int result = 0;
        struct acpi_pci_link *link = NULL;
        int i = 0;
        int found = 0;
 
 
        if (!device)
                return -EINVAL;
 
        link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
        if (!link)
                return -ENOMEM;
 
        link->device = device;
        strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
        strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
        acpi_driver_data(device) = link;
 
        mutex_lock(&acpi_link_lock);
        result = acpi_pci_link_get_possible(link);
        if (result)
                goto end;
 
        /* query and set link->irq.active */
        acpi_pci_link_get_current(link);
 
        printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
               acpi_device_bid(device));
        for (i = 0; i < link->irq.possible_count; i++) {
                if (link->irq.active == link->irq.possible[i]) {
                        printk(" *%d", link->irq.possible[i]);
                        found = 1;
                } else
                        printk(" %d", link->irq.possible[i]);
        }
 
        printk(")");
 
        if (!found)
                printk(" *%d", link->irq.active);
 
        if (!link->device->status.enabled)
                printk(", disabled.");
 
        printk("\n");
 
        /* TBD: Acquire/release lock */
        list_add_tail(&link->node, &acpi_link.entries);
        acpi_link.count++;
 
      end:
        /* disable all links -- to be activated on use */
        acpi_ut_evaluate_object(device->handle, "_DIS", 0, NULL);
        mutex_unlock(&acpi_link_lock);
 
        if (result)
                kfree(link);
 
        return result;
}
 
static int acpi_pci_link_resume(struct acpi_pci_link *link)
{
 
        if (link->refcnt && link->irq.active && link->irq.initialized)
                return (acpi_pci_link_set(link, link->irq.active));
        else
                return 0;
}
 
static int irqrouter_resume(struct sys_device *dev)
{
        struct list_head *node = NULL;
        struct acpi_pci_link *link = NULL;
 
 
        /* Make sure SCI is enabled again (Apple firmware bug?) */
        acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);
 
        list_for_each(node, &acpi_link.entries) {
                link = list_entry(node, struct acpi_pci_link, node);
                if (!link) {
                        printk(KERN_ERR PREFIX "Invalid link context\n");
                        continue;
                }
                acpi_pci_link_resume(link);
        }
        return 0;
}
 
static int acpi_pci_link_remove(struct acpi_device *device, int type)
{
        struct acpi_pci_link *link = NULL;
 
 
        if (!device || !acpi_driver_data(device))
                return -EINVAL;
 
        link = acpi_driver_data(device);
 
        mutex_lock(&acpi_link_lock);
        list_del(&link->node);
        mutex_unlock(&acpi_link_lock);
 
        kfree(link);
 
        return 0;
}
 
/*
 * modify acpi_irq_penalty[] from cmdline
 */
static int __init acpi_irq_penalty_update(char *str, int used)
{
        int i;
 
        for (i = 0; i < 16; i++) {
                int retval;
                int irq;
 
                retval = get_option(&str, &irq);
 
                if (!retval)
                        break;  /* no number found */
 
                if (irq < 0)
                        continue;
 
                if (irq >= ACPI_MAX_IRQS)
                        continue;
 
                if (used)
                        acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
                else
                        acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
 
                if (retval != 2)        /* no next number */
                        break;
        }
        return 1;
}
 
/*
 * We'd like PNP to call this routine for the
 * single ISA_USED value for each legacy device.
 * But instead it calls us with each POSSIBLE setting.
 * There is no ISA_POSSIBLE weight, so we simply use
 * the (small) PCI_USING penalty.
 */
void acpi_penalize_isa_irq(int irq, int active)
{
        if (active)
                acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
        else
                acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
}
 
/*
 * Over-ride default table to reserve additional IRQs for use by ISA
 * e.g. acpi_irq_isa=5
 * Useful for telling ACPI how not to interfere with your ISA sound card.
 */
static int __init acpi_irq_isa(char *str)
{
        return acpi_irq_penalty_update(str, 1);
}
 
__setup("acpi_irq_isa=", acpi_irq_isa);
 
/*
 * Over-ride default table to free additional IRQs for use by PCI
 * e.g. acpi_irq_pci=7,15
 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
 */
static int __init acpi_irq_pci(char *str)
{
        return acpi_irq_penalty_update(str, 0);
}
 
__setup("acpi_irq_pci=", acpi_irq_pci);
 
static int __init acpi_irq_nobalance_set(char *str)
{
        acpi_irq_balance = 0;
        return 1;
}
 
__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
 
int __init acpi_irq_balance_set(char *str)
{
        acpi_irq_balance = 1;
        return 1;
}
 
__setup("acpi_irq_balance", acpi_irq_balance_set);
 
/* FIXME: we will remove this interface after all drivers call pci_disable_device */
static struct sysdev_class irqrouter_sysdev_class = {
        set_kset_name("irqrouter"),
        .resume = irqrouter_resume,
};
 
static struct sys_device device_irqrouter = {
        .id = 0,
        .cls = &irqrouter_sysdev_class,
};
 
static int __init irqrouter_init_sysfs(void)
{
        int error;
 
 
        if (acpi_disabled || acpi_noirq)
                return 0;
 
        error = sysdev_class_register(&irqrouter_sysdev_class);
        if (!error)
                error = sysdev_register(&device_irqrouter);
 
        return error;
}
 
device_initcall(irqrouter_init_sysfs);
 
static int __init acpi_pci_link_init(void)
{
 
        if (acpi_noirq)
                return 0;
 
        acpi_link.count = 0;
        INIT_LIST_HEAD(&acpi_link.entries);
 
        if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
                return -ENODEV;
 
        return 0;
}
 
subsys_initcall(acpi_pci_link_init);
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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [acpi/] [pci_link.c] - Blame information for rev 67

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)`
3			`*`
4			`* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>`
5			`* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>`
6			`* Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>`
7			`*`
8			`* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
9			`*`
10			`* This program is free software; you can redistribute it and/or modify`
11			`* it under the terms of the GNU General Public License as published by`
12			`* the Free Software Foundation; either version 2 of the License, or (at`
13			`* your option) any later version.`
14			`*`
15			`* This program is distributed in the hope that it will be useful, but`
16			`* WITHOUT ANY WARRANTY; without even the implied warranty of`
17			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
18			`* General Public License for more details.`
19			`*`
20			`* You should have received a copy of the GNU General Public License along`
21			`* with this program; if not, write to the Free Software Foundation, Inc.,`
22			`* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.`
23			`*`
24			`* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
25			`*`
26			`* TBD:`
27			`* 1. Support more than one IRQ resource entry per link device (index).`
28			`* 2. Implement start/stop mechanism and use ACPI Bus Driver facilities`
29			`* for IRQ management (e.g. start()->_SRS).`
30			`*/`
31
32			`#include <linux/sysdev.h>`
33			`#include <linux/kernel.h>`
34			`#include <linux/module.h>`
35			`#include <linux/init.h>`
36			`#include <linux/types.h>`
37			`#include <linux/proc_fs.h>`
38			`#include <linux/spinlock.h>`
39			`#include <linux/pm.h>`
40			`#include <linux/pci.h>`