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soc/intel/common/block/itss: Route PCI INT pin to PIRQ using PIR

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ITSS has PCI Interrupt Route (PIR) registers to map PCI INTA-D to one
of PIRQA-H. This patch adds a function itss_get_dev_pirq() returning
PIRQ for a given device and INT pin.

Change-Id: If911b34c506a4a3657b873baab33814c1a7d674b
Signed-off-by: Yuchi Chen <yuchi.chen@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85012
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Shuo Liu <shuo.liu@intel.com>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
This commit is contained in:
Yuchi Chen 2024-11-06 08:50:00 +08:00 • committed by Lean Sheng Tan
commit 26be949137
2 changed files with 26 additions and 0 deletions
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10
src/soc/intel/common/block/include/intelblocks/itss.h
View file

@ -23,6 +23,9 @@
#define PCR_ITSS_PIRQG_ROUT 0x3106
/* PIRQH Routing Control Register */
#define PCR_ITSS_PIRQH_ROUT 0x3107
/* ITSS Interrupt Route */
#define PCR_ITSS_PIR 0x3140
#define PCI_ITSS_PIR(i) (PCR_ITSS_PIR + (i) * 2)
/* ITSS Interrupt polarity control */
#define PCR_ITSS_IPC0_CONF 0x3200
/* ITSS Power reduction control */
@ -30,6 +33,7 @@
#if !defined(__ACPI__)
#include <device/device.h>
#include <southbridge/intel/common/acpi_pirq_gen.h>
#include <stdint.h>
@ -43,6 +47,12 @@ void itss_restore_irq_polarities(int start, int end);
void itss_irq_init(const uint8_t pch_interrupt_routing[PIRQ_COUNT]);
void itss_clock_gate_8254(void);
/* SoC implementation to return corresponding PIR register offset. */
uint32_t itss_soc_get_on_chip_dev_pir(struct device *dev);
/* Return which PIRQx the device's INTx is connected to. */
enum pirq itss_get_on_chip_dev_pirq(struct device *dev, enum pci_pin pin);
#endif /* !defined(__ACPI__) */
#endif /* SOC_INTEL_COMMON_BLOCK_ITSS_H */

16
src/soc/intel/common/block/itss/itss.c
View file

@ -134,3 +134,19 @@ void itss_restore_irq_polarities(int start, int end)
show_irq_polarities("After");
}
enum pirq itss_get_on_chip_dev_pirq(struct device *dev, enum pci_pin pin)
{
/* Check if device is on chip. */
if (dev->upstream->dev->path.type != DEVICE_PATH_DOMAIN)
return PIRQ_INVALID;
uint16_t pir = pcr_read16(PID_ITSS, itss_soc_get_on_chip_dev_pir(dev));
if (pir < PCI_ITSS_PIR(0))
return PIRQ_INVALID;
/* The lower 3 bits of every 4 bits indicates which PIRQ is connect to INT. */
unsigned int pir_shift = (pin - PCI_INT_A) * 4;
unsigned int pir_mask = 0x07;
return ((pir >> pir_shift) & pir_mask) + PIRQ_A;
}