minix/drivers/acpi/pci.c

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#include <minix/driver.h>
#include <acpi.h>
#include <assert.h>
#include <minix/acpi.h>
#include "acpi_globals.h"
#define PCI_MAX_DEVICES 32
#define PCI_MAX_PINS 4
#define IRQ_TABLE_ENTRIES (PCI_MAX_DEVICES * PCI_MAX_PINS)
struct pci_bridge {
ACPI_HANDLE handle;
int irqtable[IRQ_TABLE_ENTRIES];
int primary_bus;
int secondary_bus;
unsigned device;
struct pci_bridge * parent;
struct pci_bridge * children[PCI_MAX_DEVICES];
};
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static struct pci_bridge pci_root_bridge;
struct irq_resource {
struct pci_bridge * bridge;
ACPI_PCI_ROUTING_TABLE * tbl;
};
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static struct pci_bridge * find_bridge(struct pci_bridge * root,
int pbnr,
int dev,
int sbnr)
{
if (!root)
return NULL;
if (sbnr == -1) {
if (root->secondary_bus == pbnr)
return root->children[dev];
else {
/* serach all children */
unsigned d;
for (d = 0; d < PCI_MAX_DEVICES; d++) {
struct pci_bridge * b;
b = find_bridge(root->children[d],
pbnr, dev, sbnr);
if (b)
return b;
}
}
} else {
if (root->secondary_bus == sbnr)
return root;
else {
/* check all children */
unsigned d;
for (d = 0; d < PCI_MAX_DEVICES; d++) {
struct pci_bridge * b;
b = find_bridge(root->children[d],
pbnr, dev, sbnr);
if (b)
return b;
}
}
}
return NULL;
}
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void do_map_bridge(message *m)
{
int err = OK;
unsigned dev = ((struct acpi_map_bridge_req *)m)->device;
unsigned pbnr = ((struct acpi_map_bridge_req *)m)->primary_bus;
unsigned sbnr = ((struct acpi_map_bridge_req *)m)->secondary_bus;
struct pci_bridge * bridge;
bridge = find_bridge(&pci_root_bridge, pbnr, dev, -1);
if (!bridge) {
err = ENODEV;
goto map_error;
}
bridge->primary_bus = pbnr;
bridge->secondary_bus = sbnr;
map_error:
((struct acpi_map_bridge_resp *)m)->err = err;
}
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#if 0
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static ACPI_STATUS device_get_int(ACPI_HANDLE handle,
char * name,
ACPI_INTEGER * val)
{
ACPI_STATUS status;
char buff[sizeof(ACPI_OBJECT)];
ACPI_BUFFER abuff;
abuff.Length = sizeof(buff);
abuff.Pointer = buff;
status = AcpiEvaluateObjectTyped(handle, name, NULL,
&abuff, ACPI_TYPE_INTEGER);
if (ACPI_SUCCESS(status)) {
*val = ((ACPI_OBJECT *)abuff.Pointer)->Integer.Value;
}
return status;
}
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#endif
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void do_get_irq(message *m)
{
struct pci_bridge * bridge;
int irq;
unsigned bus = ((struct acpi_get_irq_req *)m)->bus;
unsigned dev = ((struct acpi_get_irq_req *)m)->dev;
unsigned pin = ((struct acpi_get_irq_req *)m)->pin;
assert(dev < PCI_MAX_DEVICES && pin < PCI_MAX_PINS);
bridge = find_bridge(&pci_root_bridge, -1, -1, bus);
if (!bridge)
irq = -1;
else
irq = bridge->irqtable[dev * PCI_MAX_PINS + pin];
((struct acpi_get_irq_resp *)m)->irq = irq;
}
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static void add_irq(struct pci_bridge * bridge,
unsigned dev,
unsigned pin,
u8_t irq)
{
assert(dev < PCI_MAX_DEVICES && pin < PCI_MAX_PINS);
bridge->irqtable[dev * PCI_MAX_PINS + pin] = irq;
}
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static ACPI_STATUS get_irq_resource(ACPI_RESOURCE *res, void *context)
{
struct irq_resource * ires = (struct irq_resource *) context;
if (res->Type == ACPI_RESOURCE_TYPE_IRQ) {
ACPI_RESOURCE_IRQ *irq;
irq = &res->Data.Irq;
add_irq(ires->bridge, ires->tbl->Address >> 16, ires->tbl->Pin,
irq->Interrupts[ires->tbl->SourceIndex]);
} else if (res->Type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
ACPI_RESOURCE_EXTENDED_IRQ *irq;
irq = &res->Data.ExtendedIrq;
add_irq(ires->bridge, ires->tbl->Address >> 16, ires->tbl->Pin,
irq->Interrupts[ires->tbl->SourceIndex]);
}
return AE_OK;
}
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static ACPI_STATUS get_pci_irq_routing(struct pci_bridge * bridge)
{
ACPI_STATUS status;
ACPI_BUFFER abuff;
char buff[4096];
ACPI_PCI_ROUTING_TABLE *tbl;
ACPI_DEVICE_INFO *info;
int i;
abuff.Length = sizeof(buff);
abuff.Pointer = buff;
status = AcpiGetIrqRoutingTable(bridge->handle, &abuff);
if (ACPI_FAILURE(status)) {
return AE_OK;
}
info = abuff.Pointer;
status = AcpiGetObjectInfo(bridge->handle, &info);
if (ACPI_FAILURE(status))
return status;
/*
* Decode the device number (upper half of the address) and attach the
* new bridge in the children list of its parent
*/
bridge->device = info->Address >> 16;
if (bridge != &pci_root_bridge) {
bridge->parent->children[bridge->device] = bridge;
bridge->primary_bus = bridge->secondary_bus = -1;
}
for (i = 0; i < PCI_MAX_DEVICES; i++)
bridge->children[i] = NULL;
for (tbl = (ACPI_PCI_ROUTING_TABLE *)abuff.Pointer; tbl->Length;
tbl = (ACPI_PCI_ROUTING_TABLE *)
((char *)tbl + tbl->Length)) {
ACPI_HANDLE src_handle;
struct irq_resource ires;
if (*(char*)tbl->Source == '\0') {
add_irq(bridge, tbl->Address >> 16,
tbl->Pin, tbl->SourceIndex);
continue;
}
status = AcpiGetHandle(bridge->handle, tbl->Source, &src_handle);
if (ACPI_FAILURE(status)) {
printf("Failed AcpiGetHandle\n");
continue;
}
ires.bridge = bridge;
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ires.tbl = tbl;
status = AcpiWalkResources(src_handle, METHOD_NAME__CRS,
get_irq_resource, &ires);
if (ACPI_FAILURE(status)) {
printf("Failed IRQ resource\n");
continue;
}
}
return AE_OK;
}
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static void bridge_init_irqtable(struct pci_bridge * bridge)
{
int i;
for (i = 0; i < IRQ_TABLE_ENTRIES; i++)
bridge->irqtable[i] = -1;
}
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static ACPI_STATUS add_pci_dev(ACPI_HANDLE handle,
UINT32 level,
void *context,
void **retval)
{
ACPI_STATUS status;
ACPI_BUFFER abuff;
char buff[4096];
ACPI_HANDLE parent_handle;
struct pci_bridge * bridge;
struct pci_bridge * parent_bridge = (struct pci_bridge *) context;
/* skip pci root when we get to it again */
if (handle == pci_root_bridge.handle)
return AE_OK;
status = AcpiGetParent(handle, &parent_handle);
if (!ACPI_SUCCESS(status))
return status;
/* skip devices that have a different parent */
if (parent_handle != parent_bridge->handle)
return AE_OK;
abuff.Length = sizeof(buff);
abuff.Pointer = buff;
bridge = malloc(sizeof(struct pci_bridge));
if (!bridge)
return AE_NO_MEMORY;
bridge->handle = handle;
bridge->parent = parent_bridge;
bridge_init_irqtable(bridge);
status = get_pci_irq_routing(bridge);
if (!(ACPI_SUCCESS(status))) {
free(bridge);
return status;
}
/* get the pci bridges */
status = AcpiGetDevices(NULL, add_pci_dev, bridge, NULL);
return status;
}
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static ACPI_STATUS add_pci_root_dev(ACPI_HANDLE handle,
UINT32 level,
void *context,
void **retval)
{
static unsigned called;
ACPI_STATUS status;
if (++called > 1) {
printf("ACPI: Warning! Multi rooted PCI is not supported!\n");
return AE_OK;
}
pci_root_bridge.handle = handle;
pci_root_bridge.primary_bus = -1; /* undefined */
pci_root_bridge.secondary_bus = 0; /* root bus is 0 in a single root
system */
bridge_init_irqtable(&pci_root_bridge);
status = get_pci_irq_routing(&pci_root_bridge);
if (!ACPI_SUCCESS(status))
return status;
/* get the pci bridges */
status = AcpiGetDevices(NULL, add_pci_dev, &pci_root_bridge, NULL);
return status;
}
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void pci_scan_devices(void)
{
ACPI_STATUS status;
/* do not scan devices in PIC mode */
if (!machine.apic_enabled)
return;
/* get the root first */
status = AcpiGetDevices("PNP0A03", add_pci_root_dev, NULL, NULL);
assert(ACPI_SUCCESS(status));
}