diff options
| -rw-r--r-- | src/soc/intel/fsp_broadwell_de/acpi.c | 30 | ||||
| -rw-r--r-- | src/soc/intel/fsp_broadwell_de/include/soc/irq.h | 10 |
2 files changed, 39 insertions, 1 deletions
diff --git a/src/soc/intel/fsp_broadwell_de/acpi.c b/src/soc/intel/fsp_broadwell_de/acpi.c index afa4048f09..1e088684c0 100644 --- a/src/soc/intel/fsp_broadwell_de/acpi.c +++ b/src/soc/intel/fsp_broadwell_de/acpi.c @@ -78,7 +78,35 @@ static acpi_cstate_t cstate_map[] = { static int acpi_sci_irq(void) { - return 9; + uint8_t actl = 0; + static uint8_t sci_irq = 0; + device_t dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC)); + + /* If this function was already called, just return the stored value. */ + if (sci_irq) + return sci_irq; + /* Get contents of ACPI control register. */ + actl = pci_read_config8(dev, ACPI_CNTL_OFFSET) & SCIS_MASK; + /* Determine how SCI is routed. */ + switch (actl) { + case SCIS_IRQ9: + case SCIS_IRQ10: + case SCIS_IRQ11: + sci_irq = actl + 9; + break; + case SCIS_IRQ20: + case SCIS_IRQ21: + case SCIS_IRQ22: + case SCIS_IRQ23: + sci_irq = actl - SCIS_IRQ20 + 20; + break; + default: + printk(BIOS_DEBUG, "Invalid SCI route! Defaulting to IRQ9.\n"); + sci_irq = 9; + break; + } + printk(BIOS_DEBUG, "SCI is IRQ%d\n", sci_irq); + return sci_irq; } void acpi_create_intel_hpet(acpi_hpet_t *hpet) diff --git a/src/soc/intel/fsp_broadwell_de/include/soc/irq.h b/src/soc/intel/fsp_broadwell_de/include/soc/irq.h index ea043267e3..1344f3b880 100644 --- a/src/soc/intel/fsp_broadwell_de/include/soc/irq.h +++ b/src/soc/intel/fsp_broadwell_de/include/soc/irq.h @@ -51,6 +51,16 @@ #define PIRQG 6 #define PIRQH 7 +#define ACPI_CNTL_OFFSET 0x44 +#define SCIS_MASK 0x07 +#define SCIS_IRQ9 0x00 +#define SCIS_IRQ10 0x01 +#define SCIS_IRQ11 0x02 +#define SCIS_IRQ20 0x04 +#define SCIS_IRQ21 0x05 +#define SCIS_IRQ22 0x06 +#define SCIS_IRQ23 0x07 + /* In each mainboard directory there should exist a header file irqroute.h that * defines the PCI_DEV_PIRQ_ROUTES and PIRQ_PIC_ROUTES macros which * consist of PCI_DEV_PIRQ_ROUTE and PIRQ_PIC entries. */ |