minix/drivers/acpi/acpi.c
Tomas Hruby e6ebac015d APIC mode uses IO APICs
- kernel turns on IO APICs if no_apic is _not_ set or is equal 0

- pci driver must use the acpi driver to setup IRQ routing otherwise
  the system cannot work correctly except systems like KVM that use
  only legacy (E)ISA IRQs 0-15
2010-09-07 07:18:11 +00:00

302 lines
6.4 KiB
C

#include <minix/driver.h>
#include <acpi.h>
#include <assert.h>
#include <minix/acpi.h>
PUBLIC int acpi_enabled;
PUBLIC struct machine machine;
#define PCI_MAX_DEVICES 32
#define PCI_MAX_PINS 4
#define IRQ_TABLE_ENTRIES (PCI_MAX_DEVICES * PCI_MAX_PINS)
PRIVATE int irqtable[IRQ_TABLE_ENTRIES];
PRIVATE ACPI_HANDLE pci_root_handle;
/* don't know where ACPI tables are, we may need to access any memory */
PRIVATE int init_mem_priv(void)
{
struct mem_range mr;
mr.mr_base = 0;
mr.mr_limit = 0xffffffff;
return sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mr);
}
PRIVATE void set_machine_mode(void)
{
ACPI_OBJECT arg1;
ACPI_OBJECT_LIST args;
ACPI_STATUS as;
arg1.Type = ACPI_TYPE_INTEGER;
arg1.Integer.Value = machine.apic_enabled ? 1 : 0;
args.Count = 1;
args.Pointer = &arg1;
as = AcpiEvaluateObject(ACPI_ROOT_OBJECT, "_PIC", &args, NULL);
/*
* We can silently ignore failure as it may not be implemented, ACPI should
* provide us with correct information anyway
*/
if (ACPI_SUCCESS(as))
printf("ACPI: machine set to %s mode\n",
machine.apic_enabled ? "APIC" : "PIC");
}
PRIVATE 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;
}
PRIVATE void do_get_irq(message *m)
{
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);
((struct acpi_get_irq_resp *)m)->irq =
irqtable[dev * PCI_MAX_PINS + pin];
}
PRIVATE void add_irq(unsigned dev, unsigned pin, u8_t irq)
{
assert(dev < PCI_MAX_DEVICES && pin < PCI_MAX_PINS);
irqtable[dev * PCI_MAX_PINS + pin] = irq;
}
PRIVATE ACPI_STATUS get_irq_resource(ACPI_RESOURCE *res, void *context)
{
ACPI_PCI_ROUTING_TABLE *tbl = (ACPI_PCI_ROUTING_TABLE *) context;
if (res->Type == ACPI_RESOURCE_TYPE_IRQ) {
ACPI_RESOURCE_IRQ *irq;
irq = &res->Data.Irq;
add_irq(tbl->Address >> 16, tbl->Pin,
irq->Interrupts[tbl->SourceIndex]);
} else if (res->Type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
ACPI_RESOURCE_EXTENDED_IRQ *irq;
add_irq(tbl->Address >> 16, tbl->Pin,
irq->Interrupts[tbl->SourceIndex]);
}
return AE_OK;
}
PRIVATE ACPI_STATUS get_pci_irq_routing(ACPI_HANDLE handle)
{
ACPI_STATUS status;
ACPI_BUFFER abuff;
char buff[4096];
ACPI_PCI_ROUTING_TABLE *tbl;
abuff.Length = sizeof(buff);
abuff.Pointer = buff;
status = AcpiGetIrqRoutingTable(handle, &abuff);
if (ACPI_FAILURE(status)) {
return AE_OK;
}
for (tbl = (ACPI_PCI_ROUTING_TABLE *)abuff.Pointer; tbl->Length;
tbl = (ACPI_PCI_ROUTING_TABLE *)
((char *)tbl + tbl->Length)) {
ACPI_HANDLE src_handle;
if (*(char*)tbl->Source == '\0') {
add_irq(tbl->Address >> 16, tbl->Pin, tbl->SourceIndex);
continue;
}
status = AcpiGetHandle(handle, tbl->Source, &src_handle);
if (ACPI_FAILURE(status)) {
printf("Failed AcpiGetHandle\n");
continue;
}
status = AcpiWalkResources(src_handle, METHOD_NAME__CRS,
get_irq_resource, tbl);
if (ACPI_FAILURE(status)) {
printf("Failed IRQ resource\n");
continue;
}
}
return AE_OK;
}
PRIVATE ACPI_STATUS add_pci_root_dev(ACPI_HANDLE handle,
UINT32 level,
void *context,
void **retval)
{
int i;
static unsigned called;
if (++called > 1) {
printf("ACPI: Warning! Multi rooted PCI is not supported!\n");
return AE_OK;
}
for (i = 0; i < IRQ_TABLE_ENTRIES; i++)
irqtable[i] = -1;
return get_pci_irq_routing(handle);
}
PRIVATE ACPI_STATUS add_pci_dev(ACPI_HANDLE handle,
UINT32 level,
void *context,
void **retval)
{
/* skip pci root when we get to it again */
if (handle == pci_root_handle)
return AE_OK;
return get_pci_irq_routing(handle);
}
PRIVATE void scan_devices(void)
{
ACPI_STATUS(status);
/* get the root first */
status = AcpiGetDevices("PNP0A03", add_pci_root_dev, NULL, NULL);
assert(ACPI_SUCCESS(status));
/* get the rest of the devices that implement _PRT */
status = AcpiGetDevices(NULL, add_pci_dev, NULL, NULL);
assert(ACPI_SUCCESS(status));
}
PRIVATE ACPI_STATUS init_acpica(void)
{
ACPI_STATUS status;
status = AcpiInitializeSubsystem();
if (ACPI_FAILURE(status))
return status;
status = AcpiInitializeTables(NULL, 16, FALSE);
if (ACPI_FAILURE(status))
return status;
status = AcpiLoadTables();
if (ACPI_FAILURE(status))
return status;
status = AcpiEnableSubsystem(0);
if (ACPI_FAILURE(status))
return status;
status = AcpiInitializeObjects(0);
if (ACPI_FAILURE(status))
return status;
set_machine_mode();
scan_devices();
return AE_OK;
}
PUBLIC void init_acpi(void)
{
ACPI_STATUS acpi_err;
/* test conditions for acpi */
if (sys_getmachine(&machine)) {
printf("ACPI: no machine\n");
return;
}
if (machine.acpi_rsdp == 0) {
printf("ACPI: no RSDP\n");
return;
}
if (init_mem_priv()) {
printf("ACPI: no mem access\n");
return;
}
if ((acpi_err = init_acpica()) == AE_OK) {
acpi_enabled = 1;
printf("ACPI: ACPI enabled\n");
}
else {
acpi_enabled = 0;
printf("ACPI: ACPI failed with err %d\n", acpi_err);
}
}
PRIVATE int sef_cb_init_fresh(int type, sef_init_info_t *info)
{
init_acpi();
return OK;
}
PRIVATE void sef_local_startup()
{
/* Register init callbacks. */
sef_setcb_init_fresh(sef_cb_init_fresh);
sef_setcb_init_lu(sef_cb_init_fresh);
sef_setcb_init_restart(sef_cb_init_fresh);
/* Register live update callbacks. */
sef_setcb_lu_prepare(sef_cb_lu_prepare_always_ready);
sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_standard);
/* Let SEF perform startup. */
sef_startup();
}
int main(void)
{
int err;
message m;
int ipc_status;
sef_local_startup();
for(;;) {
err = driver_receive(ANY, &m, &ipc_status);
if (err != OK) {
printf("ACPI: driver_receive failed: %d\n", err);
continue;
}
switch (((struct acpi_request_hdr *)&m)->request) {
case ACPI_REQ_GET_IRQ:
do_get_irq(&m);
break;
default:
printf("ACPI: ignoring unsupported request %d "
"from %d\n",
((struct acpi_request_hdr *)&m)->request,
((struct acpi_request_hdr *)&m)->m_source);
}
err = send(m.m_source, &m);
if (err != OK) {
printf("ACPI: send failed: %d\n", err);
}
}
}