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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/acpi/pci_link.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/acpi/pci_link.c')
-rw-r--r-- | drivers/acpi/pci_link.c | 904 |
1 files changed, 904 insertions, 0 deletions
diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c new file mode 100644 index 0000000..520b28a --- /dev/null +++ b/drivers/acpi/pci_link.c @@ -0,0 +1,904 @@ +/* + * 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 <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_HID "PNP0C0F" +#define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver" +#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_driver acpi_pci_link_driver = { + .name = ACPI_PCI_LINK_DRIVER_NAME, + .class = ACPI_PCI_LINK_CLASS, + .ids = ACPI_PCI_LINK_HID, + .ops = { + .add = acpi_pci_link_add, + .remove = acpi_pci_link_remove, + }, +}; + +struct acpi_pci_link_irq { + u8 active; /* Current IRQ */ + u8 edge_level; /* All IRQs */ + u8 active_high_low; /* All IRQs */ + u8 initialized; + u8 resource_type; + u8 possible_count; + u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; +}; + +struct acpi_pci_link { + struct list_head node; + struct acpi_device *device; + acpi_handle handle; + struct acpi_pci_link_irq irq; +}; + +static struct { + int count; + struct list_head entries; +} acpi_link; + + +/* -------------------------------------------------------------------------- + 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 = (struct acpi_pci_link *) context; + u32 i = 0; + + ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible"); + + switch (resource->id) { + case ACPI_RSTYPE_START_DPF: + return_ACPI_STATUS(AE_OK); + case ACPI_RSTYPE_IRQ: + { + struct acpi_resource_irq *p = &resource->data.irq; + if (!p || !p->number_of_interrupts) { + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Blank IRQ resource\n")); + return_ACPI_STATUS(AE_OK); + } + for (i = 0; (i<p->number_of_interrupts && i<ACPI_PCI_LINK_MAX_POSSIBLE); i++) { + if (!p->interrupts[i]) { + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i])); + continue; + } + link->irq.possible[i] = p->interrupts[i]; + link->irq.possible_count++; + } + link->irq.edge_level = p->edge_level; + link->irq.active_high_low = p->active_high_low; + link->irq.resource_type = ACPI_RSTYPE_IRQ; + break; + } + case ACPI_RSTYPE_EXT_IRQ: + { + struct acpi_resource_ext_irq *p = &resource->data.extended_irq; + if (!p || !p->number_of_interrupts) { + ACPI_DEBUG_PRINT((ACPI_DB_WARN, + "Blank EXT IRQ resource\n")); + return_ACPI_STATUS(AE_OK); + } + for (i = 0; (i<p->number_of_interrupts && i<ACPI_PCI_LINK_MAX_POSSIBLE); i++) { + if (!p->interrupts[i]) { + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i])); + continue; + } + link->irq.possible[i] = p->interrupts[i]; + link->irq.possible_count++; + } + link->irq.edge_level = p->edge_level; + link->irq.active_high_low = p->active_high_low; + link->irq.resource_type = ACPI_RSTYPE_EXT_IRQ; + break; + } + default: + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Resource is not an IRQ entry\n")); + return_ACPI_STATUS(AE_OK); + } + + return_ACPI_STATUS(AE_CTRL_TERMINATE); +} + + +static int +acpi_pci_link_get_possible ( + struct acpi_pci_link *link) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible"); + + if (!link) + return_VALUE(-EINVAL); + + status = acpi_walk_resources(link->handle, METHOD_NAME__PRS, + acpi_pci_link_check_possible, link); + if (ACPI_FAILURE(status)) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n")); + return_VALUE(-ENODEV); + } + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Found %d possible IRQs\n", link->irq.possible_count)); + + return_VALUE(0); +} + + +static acpi_status +acpi_pci_link_check_current ( + struct acpi_resource *resource, + void *context) +{ + int *irq = (int *) context; + + ACPI_FUNCTION_TRACE("acpi_pci_link_check_current"); + + switch (resource->id) { + case ACPI_RSTYPE_IRQ: + { + struct acpi_resource_irq *p = &resource->data.irq; + if (!p || !p->number_of_interrupts) { + /* + * 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_ACPI_STATUS(AE_OK); + } + *irq = p->interrupts[0]; + break; + } + case ACPI_RSTYPE_EXT_IRQ: + { + struct acpi_resource_ext_irq *p = &resource->data.extended_irq; + if (!p || !p->number_of_interrupts) { + /* + * extended IRQ descriptors must + * return at least 1 IRQ + */ + ACPI_DEBUG_PRINT((ACPI_DB_WARN, + "Blank EXT IRQ resource\n")); + return_ACPI_STATUS(AE_OK); + } + *irq = p->interrupts[0]; + break; + } + default: + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Resource isn't an IRQ\n")); + return_ACPI_STATUS(AE_OK); + } + return_ACPI_STATUS(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; + + ACPI_FUNCTION_TRACE("acpi_pci_link_get_current"); + + if (!link || !link->handle) + return_VALUE(-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) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n")); + goto end; + } + + if (!link->device->status.enabled) { + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); + return_VALUE(0); + } + } + + /* + * Query and parse _CRS to get the current IRQ assignment. + */ + + status = acpi_walk_resources(link->handle, METHOD_NAME__CRS, + acpi_pci_link_check_current, &irq); + if (ACPI_FAILURE(status)) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n")); + result = -ENODEV; + goto end; + } + + if (acpi_strict && !irq) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_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_VALUE(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}; + + ACPI_FUNCTION_TRACE("acpi_pci_link_set"); + + if (!link || !irq) + return_VALUE(-EINVAL); + + resource = kmalloc( sizeof(*resource)+1, GFP_KERNEL); + if(!resource) + return_VALUE(-ENOMEM); + + memset(resource, 0, sizeof(*resource)+1); + buffer.length = sizeof(*resource) +1; + buffer.pointer = resource; + + switch(link->irq.resource_type) { + case ACPI_RSTYPE_IRQ: + resource->res.id = ACPI_RSTYPE_IRQ; + resource->res.length = sizeof(struct acpi_resource); + resource->res.data.irq.edge_level = link->irq.edge_level; + resource->res.data.irq.active_high_low = link->irq.active_high_low; + if (link->irq.edge_level == ACPI_EDGE_SENSITIVE) + resource->res.data.irq.shared_exclusive = ACPI_EXCLUSIVE; + else + resource->res.data.irq.shared_exclusive = ACPI_SHARED; + resource->res.data.irq.number_of_interrupts = 1; + resource->res.data.irq.interrupts[0] = irq; + break; + + case ACPI_RSTYPE_EXT_IRQ: + resource->res.id = ACPI_RSTYPE_EXT_IRQ; + resource->res.length = sizeof(struct acpi_resource); + resource->res.data.extended_irq.producer_consumer = ACPI_CONSUMER; + resource->res.data.extended_irq.edge_level = link->irq.edge_level; + resource->res.data.extended_irq.active_high_low = link->irq.active_high_low; + if (link->irq.edge_level == ACPI_EDGE_SENSITIVE) + resource->res.data.irq.shared_exclusive = ACPI_EXCLUSIVE; + else + resource->res.data.irq.shared_exclusive = ACPI_SHARED; + resource->res.data.extended_irq.number_of_interrupts = 1; + resource->res.data.extended_irq.interrupts[0] = irq; + /* ignore resource_source, it's optional */ + break; + default: + printk("ACPI BUG: resource_type %d\n", link->irq.resource_type); + result = -EINVAL; + goto end; + + } + resource->end.id = ACPI_RSTYPE_END_TAG; + + /* Attempt to set the resource */ + status = acpi_set_current_resources(link->handle, &buffer); + + /* check for total failure */ + if (ACPI_FAILURE(status)) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n")); + result = -ENODEV; + goto end; + } + + /* Query _STA, set device->status */ + result = acpi_bus_get_status(link->device); + if (result) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "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_VALUE(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; + + ACPI_FUNCTION_TRACE("acpi_irq_penalty_init"); + + /* + * Update penalties to facilitate IRQ balancing. + */ + list_for_each(node, &acpi_link.entries) { + + link = list_entry(node, struct acpi_pci_link, node); + if (!link) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "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_fadt.sci_int] += PIRQ_PENALTY_PCI_USING; + + return_VALUE(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; + + ACPI_FUNCTION_TRACE("acpi_pci_link_allocate"); + + if (link->irq.initialized) + return_VALUE(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(PREFIX "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n" + "Try pci=noacpi or acpi=off\n", + acpi_device_name(link->device), + acpi_device_bid(link->device)); + return_VALUE(-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_VALUE(0); +} + +/* + * acpi_pci_link_get_irq + * success: return IRQ >= 0 + * failure: return -1 + */ + +int +acpi_pci_link_get_irq ( + acpi_handle handle, + int index, + int *edge_level, + int *active_high_low, + char **name) +{ + int result = 0; + struct acpi_device *device = NULL; + struct acpi_pci_link *link = NULL; + + ACPI_FUNCTION_TRACE("acpi_pci_link_get_irq"); + + result = acpi_bus_get_device(handle, &device); + if (result) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n")); + return_VALUE(-1); + } + + link = (struct acpi_pci_link *) acpi_driver_data(device); + if (!link) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); + return_VALUE(-1); + } + + /* TBD: Support multiple index (IRQ) entries per Link Device */ + if (index) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index)); + return_VALUE(-1); + } + + if (acpi_pci_link_allocate(link)) + return_VALUE(-1); + + if (!link->irq.active) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n")); + return_VALUE(-1); + } + + if (edge_level) *edge_level = link->irq.edge_level; + if (active_high_low) *active_high_low = link->irq.active_high_low; + if (name) *name = acpi_device_bid(link->device); + return_VALUE(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; + + ACPI_FUNCTION_TRACE("acpi_pci_link_add"); + + if (!device) + return_VALUE(-EINVAL); + + link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); + if (!link) + return_VALUE(-ENOMEM); + memset(link, 0, sizeof(struct acpi_pci_link)); + + link->device = device; + link->handle = device->handle; + strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); + strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); + acpi_driver_data(device) = link; + + result = acpi_pci_link_get_possible(link); + if (result) + goto end; + + /* query and set link->irq.active */ + acpi_pci_link_get_current(link); + + printk(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(link->handle, "_DIS", 0, NULL); + + if (result) + kfree(link); + + return_VALUE(result); +} + + +static int +acpi_pci_link_resume ( + struct acpi_pci_link *link) +{ + ACPI_FUNCTION_TRACE("acpi_pci_link_resume"); + + if (link->irq.active && link->irq.initialized) + return_VALUE(acpi_pci_link_set(link, link->irq.active)); + else + return_VALUE(0); +} + + +static int +irqrouter_resume( + struct sys_device *dev) +{ + struct list_head *node = NULL; + struct acpi_pci_link *link = NULL; + + ACPI_FUNCTION_TRACE("irqrouter_resume"); + + list_for_each(node, &acpi_link.entries) { + + link = list_entry(node, struct acpi_pci_link, node); + if (!link) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n")); + continue; + } + + acpi_pci_link_resume(link); + } + return_VALUE(0); +} + + +static int +acpi_pci_link_remove ( + struct acpi_device *device, + int type) +{ + struct acpi_pci_link *link = NULL; + + ACPI_FUNCTION_TRACE("acpi_pci_link_remove"); + + if (!device || !acpi_driver_data(device)) + return_VALUE(-EINVAL); + + link = (struct acpi_pci_link *) acpi_driver_data(device); + + /* TBD: Acquire/release lock */ + list_del(&link->node); + + kfree(link); + + return_VALUE(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) +{ + 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); + + +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; + + ACPI_FUNCTION_TRACE("irqrouter_init_sysfs"); + + if (acpi_disabled || acpi_noirq) + return_VALUE(0); + + error = sysdev_class_register(&irqrouter_sysdev_class); + if (!error) + error = sysdev_register(&device_irqrouter); + + return_VALUE(error); +} + +device_initcall(irqrouter_init_sysfs); + + +static int __init acpi_pci_link_init (void) +{ + ACPI_FUNCTION_TRACE("acpi_pci_link_init"); + + if (acpi_noirq) + return_VALUE(0); + + acpi_link.count = 0; + INIT_LIST_HEAD(&acpi_link.entries); + + if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) + return_VALUE(-ENODEV); + + return_VALUE(0); +} + +subsys_initcall(acpi_pci_link_init); |