forked from KolibriOS/kolibrios
610 lines
18 KiB
C
610 lines
18 KiB
C
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#include <ddk.h>
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#include <linux/errno.h>
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#include <mutex.h>
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#include <linux/spinlock.h>
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#include <pci.h>
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#include <syscall.h>
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#include "acpi.h"
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#include "acpi_bus.h"
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#define PREFIX "ACPI: "
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struct acpi_prt_entry
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{
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struct list_head list;
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ACPI_PCI_ID id;
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u8 pin;
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ACPI_HANDLE link;
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u32 index; /* GSI, or link _CRS index */
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};
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static LIST_HEAD(acpi_prt_list);
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static DEFINE_SPINLOCK(acpi_prt_lock);
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static inline char pin_name(int pin)
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{
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return 'A' + pin - 1;
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}
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/* --------------------------------------------------------------------------
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PCI IRQ Routing Table (PRT) Support
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-------------------------------------------------------------------------- */
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static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
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int pin)
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{
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struct acpi_prt_entry *entry;
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int segment = pci_domain_nr(dev->bus);
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int bus = dev->bus->number;
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int device = PCI_SLOT(dev->devfn);
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spin_lock(&acpi_prt_lock);
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list_for_each_entry(entry, &acpi_prt_list, list) {
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if ((segment == entry->id.Segment)
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&& (bus == entry->id.Bus)
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&& (device == entry->id.Device)
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&& (pin == entry->pin)) {
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spin_unlock(&acpi_prt_lock);
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return entry;
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}
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}
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spin_unlock(&acpi_prt_lock);
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return NULL;
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}
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static int acpi_pci_irq_add_entry(ACPI_HANDLE handle, struct pci_bus *bus,
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struct acpi_pci_routing_table *prt)
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{
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struct acpi_prt_entry *entry;
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entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
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if (!entry)
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return -ENOMEM;
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/*
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* Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
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* 1=INTA, 2=INTB. We use the PCI encoding throughout, so convert
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* it here.
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*/
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entry->id.Segment = pci_domain_nr(bus);
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entry->id.Bus = bus->number;
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entry->id.Device = (prt->Address >> 16) & 0xFFFF;
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entry->pin = prt->Pin + 1;
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// do_prt_fixups(entry, prt);
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entry->index = prt->SourceIndex;
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/*
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* Type 1: Dynamic
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* ---------------
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* The 'source' field specifies the PCI interrupt link device used to
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* configure the IRQ assigned to this slot|dev|pin. The 'source_index'
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* indicates which resource descriptor in the resource template (of
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* the link device) this interrupt is allocated from.
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*
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* NOTE: Don't query the Link Device for IRQ information at this time
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* because Link Device enumeration may not have occurred yet
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* (e.g. exists somewhere 'below' this _PRT entry in the ACPI
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* namespace).
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*/
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if (prt->Source[0])
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AcpiGetHandle(handle, prt->Source, &entry->link);
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/*
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* Type 2: Static
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* --------------
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* The 'source' field is NULL, and the 'source_index' field specifies
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* the IRQ value, which is hardwired to specific interrupt inputs on
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* the interrupt controller.
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*/
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dbgprintf(PREFIX " %04x:%02x:%02x[%c] -> %s[%d]\n",
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entry->id.Segment, entry->id.Bus,
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entry->id.Device, pin_name(entry->pin),
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prt->Source, entry->index);
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spin_lock(&acpi_prt_lock);
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list_add_tail(&entry->list, &acpi_prt_list);
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spin_unlock(&acpi_prt_lock);
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return 0;
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}
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int acpi_pci_irq_add_prt(ACPI_HANDLE handle, struct pci_bus *bus)
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{
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ACPI_STATUS status;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_pci_routing_table *entry;
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/* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
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status = AcpiGetName(handle, ACPI_FULL_PATHNAME, &buffer);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
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(char *) buffer.Pointer);
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kfree(buffer.Pointer);
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buffer.Length = ACPI_ALLOCATE_BUFFER;
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buffer.Pointer = NULL;
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status = AcpiGetIrqRoutingTable(handle, &buffer);
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if (ACPI_FAILURE(status))
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{
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dbgprintf("AcpiGetIrqRoutingTable failed "
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"evaluating _PRT [%s]\n",AcpiFormatException(status));
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kfree(buffer.Pointer);
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return -ENODEV;
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}
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entry = buffer.Pointer;
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while (entry && (entry->Length > 0)) {
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acpi_pci_irq_add_entry(handle, bus, entry);
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entry = (struct acpi_pci_routing_table *)
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((unsigned long)entry + entry->Length);
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}
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kfree(buffer.Pointer);
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return 0;
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}
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static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
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{
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struct acpi_prt_entry *entry;
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struct pci_dev *bridge;
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u8 bridge_pin, orig_pin = pin;
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entry = acpi_pci_irq_find_prt_entry(dev, pin);
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if (entry) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
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pci_name(dev), pin_name(pin)));
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return entry;
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}
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/*
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* Attempt to derive an IRQ for this device from a parent bridge's
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* PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
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*/
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bridge = dev->bus->self;
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while (bridge)
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{
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pin = pci_swizzle_interrupt_pin(dev, pin);
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if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
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/* PC card has the same IRQ as its cardbridge */
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bridge_pin = bridge->pin;
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if (!bridge_pin) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"No interrupt pin configured for device %s\n",
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pci_name(bridge)));
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return NULL;
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}
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pin = bridge_pin;
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}
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entry = acpi_pci_irq_find_prt_entry(bridge, pin);
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if (entry) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Derived GSI for %s INT %c from %s\n",
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pci_name(dev), pin_name(orig_pin),
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pci_name(bridge)));
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return entry;
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}
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dev = bridge;
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bridge = dev->bus->self;
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}
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dbgprintf("can't derive routing for PCI INT %c\n",
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pin_name(orig_pin));
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return NULL;
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}
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int acpi_get_irq(struct pci_dev *dev)
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{
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struct acpi_prt_entry *entry;
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int gsi = -1;
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u8 pin;
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int triggering = ACPI_LEVEL_SENSITIVE;
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int polarity = ACPI_ACTIVE_LOW;
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char *link = NULL;
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char link_desc[16];
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int rc;
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pin = dev->pin;
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if ( !pin )
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{
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dbgprintf("No interrupt pin configured for device %s\n",
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pci_name(dev));
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return 0;
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}
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entry = acpi_pci_irq_lookup(dev, pin);
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if (!entry) {
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/*
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* IDE legacy mode controller IRQs are magic. Why do compat
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* extensions always make such a nasty mess.
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*/
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if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
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(dev->class & 0x05) == 0)
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return 0;
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}
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if (entry)
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{
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if (entry->link)
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{
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gsi = acpi_pci_link_allocate_irq(entry->link,
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entry->index,
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&triggering, &polarity,
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&link);
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// dbgprintf("link not implemen\n");
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}
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else
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gsi = entry->index;
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} else
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gsi = -1;
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#if 0
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/*
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* No IRQ known to the ACPI subsystem - maybe the BIOS /
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* driver reported one, then use it. Exit in any case.
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*/
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if (gsi < 0) {
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u32 dev_gsi;
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dev_warn(&dev->dev, "PCI INT %c: no GSI", pin_name(pin));
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/* Interrupt Line values above 0xF are forbidden */
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if (dev->irq > 0 && (dev->irq <= 0xF) &&
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(acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
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printk(" - using ISA IRQ %d\n", dev->irq);
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acpi_register_gsi(&dev->dev, dev_gsi,
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ACPI_LEVEL_SENSITIVE,
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ACPI_ACTIVE_LOW);
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return 0;
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} else {
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printk("\n");
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return 0;
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}
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}
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rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
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if (rc < 0) {
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dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
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pin_name(pin));
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return rc;
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}
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dev->irq = rc;
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if (link)
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snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
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else
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link_desc[0] = '\0';
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dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
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pin_name(pin), link_desc, gsi,
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(triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
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(polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
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#endif
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return gsi;
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}
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#define ACPI_PCI_LINK_MAX_POSSIBLE 16
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/*
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* If a link is initialized, we never change its active and initialized
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* later even the link is disable. Instead, we just repick the active irq
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*/
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struct acpi_pci_link_irq {
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u8 active; /* Current IRQ */
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u8 triggering; /* All IRQs */
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u8 polarity; /* All IRQs */
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u8 resource_type;
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u8 possible_count;
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u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
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u8 initialized:1;
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u8 reserved:7;
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};
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struct acpi_pci_link {
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struct list_head list;
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struct acpi_device *device;
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struct acpi_pci_link_irq irq;
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int refcnt;
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};
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static LIST_HEAD(acpi_link_list);
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static DEFINE_MUTEX(acpi_link_lock);
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static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
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{
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int result;
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ACPI_STATUS status;
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struct {
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struct acpi_resource res;
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struct acpi_resource end;
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} *resource;
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ACPI_BUFFER buffer = { 0, NULL };
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if (!irq)
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return -EINVAL;
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resource = kzalloc(sizeof(*resource) + 1, GFP_KERNEL);
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if (!resource)
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return -ENOMEM;
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buffer.Length = sizeof(*resource) + 1;
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buffer.Pointer = resource;
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switch (link->irq.resource_type) {
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case ACPI_RESOURCE_TYPE_IRQ:
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resource->res.Type = ACPI_RESOURCE_TYPE_IRQ;
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resource->res.Length = sizeof(struct acpi_resource);
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resource->res.Data.Irq.Triggering = link->irq.triggering;
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resource->res.Data.Irq.Polarity =
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link->irq.polarity;
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if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
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resource->res.Data.Irq.Sharable =
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ACPI_EXCLUSIVE;
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else
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resource->res.Data.Irq.Sharable = ACPI_SHARED;
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resource->res.Data.Irq.InterruptCount = 1;
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resource->res.Data.Irq.Interrupts[0] = irq;
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break;
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case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
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resource->res.Type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
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resource->res.Length = sizeof(struct acpi_resource);
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resource->res.Data.ExtendedIrq.ProducerConsumer =
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ACPI_CONSUMER;
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resource->res.Data.ExtendedIrq.Triggering =
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link->irq.triggering;
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resource->res.Data.ExtendedIrq.Polarity =
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link->irq.polarity;
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if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
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resource->res.Data.Irq.Sharable =
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ACPI_EXCLUSIVE;
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else
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resource->res.Data.Irq.Sharable = ACPI_SHARED;
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resource->res.Data.ExtendedIrq.InterruptCount = 1;
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resource->res.Data.ExtendedIrq.Interrupts[0] = irq;
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/* ignore resource_source, it's optional */
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break;
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default:
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printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
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result = -EINVAL;
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goto end;
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}
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resource->end.Type = ACPI_RESOURCE_TYPE_END_TAG;
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#if 0
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/* Attempt to set the resource */
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status = acpi_set_current_resources(link->device->handle, &buffer);
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/* check for total failure */
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if (ACPI_FAILURE(status)) {
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dbgprintf("%s failure Evaluating _SRS", __FUNCTION__);
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result = -ENODEV;
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goto end;
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}
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/* Query _STA, set device->status */
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result = acpi_bus_get_status(link->device);
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if (result) {
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printk(KERN_ERR PREFIX "Unable to read status\n");
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goto end;
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}
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if (!link->device->status.enabled) {
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printk(KERN_WARNING PREFIX
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"%s [%s] disabled and referenced, BIOS bug\n",
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acpi_device_name(link->device),
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acpi_device_bid(link->device));
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}
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/* Query _CRS, set link->irq.active */
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result = acpi_pci_link_get_current(link);
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if (result) {
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goto end;
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}
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/*
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* Is current setting not what we set?
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* set link->irq.active
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*/
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if (link->irq.active != irq) {
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/*
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* policy: when _CRS doesn't return what we just _SRS
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* assume _SRS worked and override _CRS value.
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*/
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printk(KERN_WARNING PREFIX
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"%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
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acpi_device_name(link->device),
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acpi_device_bid(link->device), link->irq.active, irq);
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link->irq.active = irq;
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}
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#endif
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
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end:
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kfree(resource);
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return result;
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}
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#define ACPI_MAX_IRQS 256
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#define ACPI_MAX_ISA_IRQ 16
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#define PIRQ_PENALTY_PCI_AVAILABLE (0)
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#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
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#define PIRQ_PENALTY_PCI_USING (16*16*16)
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#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
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#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
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#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
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static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
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PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
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PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
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PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
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PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
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PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
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PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
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PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
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PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
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PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
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PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
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/* >IRQ15 */
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};
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static int acpi_irq_balance = 0;
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static int acpi_pci_link_allocate(struct acpi_pci_link *link)
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{
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int irq;
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int i;
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if (link->irq.initialized) {
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if (link->refcnt == 0)
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/* This means the link is disabled but initialized */
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acpi_pci_link_set(link, link->irq.active);
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return 0;
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}
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/*
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* search for active IRQ in list of possible IRQs.
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*/
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for (i = 0; i < link->irq.possible_count; ++i) {
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if (link->irq.active == link->irq.possible[i])
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break;
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}
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/*
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* forget active IRQ that is not in possible list
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*/
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if (i == link->irq.possible_count) {
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dbgprintf(KERN_WARNING PREFIX "_CRS %d not found"
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" in _PRS\n", link->irq.active);
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link->irq.active = 0;
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}
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/*
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* if active found, use it; else pick entry from end of possible list.
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*/
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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(KERN_WARNING 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;
|
|
struct acpi_device *device;
|
|
struct acpi_pci_link *link;
|
|
|
|
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);
|
|
}
|
|
|
|
|