4 files changed, 206 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/include/intelblocks/itss.h b/src/soc/intel/common/block/include/intelblocks/itss.h
new file mode 100644
index 0000000000..11f75980fb
--- /dev/null
+++ b/src/soc/intel/common/block/include/intelblocks/itss.h
@@ -0,0 +1,59 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef SOC_INTEL_COMMON_BLOCK_ITSS_H
+#define SOC_INTEL_COMMON_BLOCK_ITSS_H
+
+/* Max PXRC registers in ITSS*/
+#define MAX_PXRC_CONFIG	(PCR_ITSS_PIRQH_ROUT - PCR_ITSS_PIRQA_ROUT + 1)
+
+/* PIRQA Routing Control Register*/
+#define PCR_ITSS_PIRQA_ROUT	0x3100
+/* PIRQB Routing Control Register*/
+#define PCR_ITSS_PIRQB_ROUT	0x3101
+/* PIRQC Routing Control Register*/
+#define PCR_ITSS_PIRQC_ROUT	0x3102
+/* PIRQD Routing Control Register*/
+#define PCR_ITSS_PIRQD_ROUT	0x3103
+/* PIRQE Routing Control Register*/
+#define PCR_ITSS_PIRQE_ROUT	0x3104
+/* PIRQF Routing Control Register*/
+#define PCR_ITSS_PIRQF_ROUT	0x3105
+/* PIRQG Routing Control Register*/
+#define PCR_ITSS_PIRQG_ROUT	0x3106
+/* PIRQH Routing Control Register*/
+#define PCR_ITSS_PIRQH_ROUT	0x3107
+/* ITSS Interrupt polarity control*/
+#define PCR_ITSS_IPC0_CONF	0x3200
+/* ITSS Power reduction control */
+#define PCR_ITSS_ITSSPRC	0x3300
+
+#if !defined(__ACPI__)
+
+#include <stdint.h>
+
+/* Set the interrupt polarity for provided IRQ to the APIC. */
+void itss_set_irq_polarity(int irq, int active_low);
+
+/* Snapshot and restore IRQ polarity settings for the inclusive range. */
+void itss_snapshot_irq_polarities(int start, int end);
+void itss_restore_irq_polarities(int start, int end);
+
+void itss_irq_init(uint8_t pch_interrupt_routing[MAX_PXRC_CONFIG]);
+void itss_clock_gate_8254(void);
+
+#endif /* !defined(__ACPI__) */
+
+#endif /* SOC_INTEL_COMMON_BLOCK_ITSS_H */
diff --git a/src/soc/intel/common/block/itss/Kconfig b/src/soc/intel/common/block/itss/Kconfig
new file mode 100644
index 0000000000..2f1a1004ad
--- /dev/null
+++ b/src/soc/intel/common/block/itss/Kconfig
@@ -0,0 +1,4 @@
+config SOC_INTEL_COMMON_BLOCK_ITSS
+	bool
+	help
+	  Intel Processor common interrupt timer subsystem support
diff --git a/src/soc/intel/common/block/itss/Makefile.inc b/src/soc/intel/common/block/itss/Makefile.inc
new file mode 100644
index 0000000000..bc0e97a2f9
--- /dev/null
+++ b/src/soc/intel/common/block/itss/Makefile.inc
@@ -0,0 +1,3 @@
+bootblock-$(CONFIG_SOC_INTEL_COMMON_BLOCK_ITSS) += itss.c
+romstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_ITSS) += itss.c
+ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_ITSS) += itss.c
diff --git a/src/soc/intel/common/block/itss/itss.c b/src/soc/intel/common/block/itss/itss.c
new file mode 100644
index 0000000000..a217675405
--- /dev/null
+++ b/src/soc/intel/common/block/itss/itss.c
@@ -0,0 +1,140 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdint.h>
+#include <commonlib/helpers.h>
+#include <console/console.h>
+#include <intelblocks/itss.h>
+#include <intelblocks/pcr.h>
+#include <soc/itss.h>
+#include <soc/pcr_ids.h>
+
+void itss_irq_init(uint8_t pch_interrupt_routing[MAX_PXRC_CONFIG])
+{
+	uint8_t index = 0;
+
+	for (index = 0; index < MAX_PXRC_CONFIG; index++) {
+		uint8_t val = pch_interrupt_routing[index];
+		uint8_t irq = val & 0xf;
+
+		if (irq == 8 || irq == 13)
+			continue;
+		if (irq <= 2)
+			continue;
+
+		pcr_write8(PID_ITSS, PCR_ITSS_PIRQA_ROUT + index, val);
+	}
+}
+
+void itss_clock_gate_8254(void)
+{
+	const uint32_t cge8254_mask = (1 << 2);
+
+	pcr_rmw32(PID_ITSS, PCR_ITSS_ITSSPRC, ~cge8254_mask, cge8254_mask);
+}
+
+void itss_set_irq_polarity(int irq, int active_low)
+{
+	uint32_t mask;
+	uint16_t reg;
+	const uint16_t port = PID_ITSS;
+
+	if (irq < 0 || irq > ITSS_MAX_IRQ)
+		return;
+
+	reg = PCR_ITSS_IPC0_CONF + sizeof(uint32_t) * (irq / IRQS_PER_IPC);
+	mask = 1 << (irq % IRQS_PER_IPC);
+
+	pcr_rmw32(port, reg, ~mask, (active_low ? mask : 0));
+}
+
+static uint32_t irq_snapshot[NUM_IPC_REGS];
+
+void itss_snapshot_irq_polarities(int start, int end)
+{
+	int i;
+	int reg_start;
+	int reg_end;
+	const uint16_t port = PID_ITSS;
+
+	if (start < 0 || start > ITSS_MAX_IRQ ||
+	    end < 0 || end > ITSS_MAX_IRQ || end < start)
+		return;
+
+	reg_start = start / IRQS_PER_IPC;
+	reg_end = (end + IRQS_PER_IPC - 1) / IRQS_PER_IPC;
+
+	for (i = reg_start; i < reg_end; i++) {
+		uint16_t reg = PCR_ITSS_IPC0_CONF + sizeof(uint32_t) * i;
+		irq_snapshot[i] = pcr_read32(port, reg);
+	}
+}
+
+static void show_irq_polarities(const char *msg)
+{
+	int i;
+	const uint16_t port = PID_ITSS;
+
+	printk(BIOS_INFO, "ITSS IRQ Polarities %s:\n", msg);
+	for (i = 0; i < NUM_IPC_REGS; i++) {
+		uint16_t reg = PCR_ITSS_IPC0_CONF + sizeof(uint32_t) * i;
+		printk(BIOS_INFO, "IPC%d: 0x%08x\n", i, pcr_read32(port, reg));
+	}
+}
+
+void itss_restore_irq_polarities(int start, int end)
+{
+	int i;
+	int reg_start;
+	int reg_end;
+	const uint16_t port = PID_ITSS;
+
+	if (start < 0 || start > ITSS_MAX_IRQ ||
+	    end < 0 || end > ITSS_MAX_IRQ || end < start)
+		return;
+
+	show_irq_polarities("Before");
+
+	reg_start = start / IRQS_PER_IPC;
+	reg_end = (end + IRQS_PER_IPC - 1) / IRQS_PER_IPC;
+
+	for (i = reg_start; i < reg_end; i++) {
+		uint32_t mask;
+		uint16_t reg;
+		int irq_start;
+		int irq_end;
+
+		irq_start = i * IRQS_PER_IPC;
+		irq_end = MIN(irq_start + IRQS_PER_IPC - 1, ITSS_MAX_IRQ);
+
+		if (start > irq_end)
+			continue;
+		if (end < irq_start)
+			break;
+
+		/* Track bits within the bounds of of the register. */
+		irq_start = MAX(start, irq_start) % IRQS_PER_IPC;
+		irq_end = MIN(end, irq_end) % IRQS_PER_IPC;
+
+		/* Create bitmask of the inclusive range of start and end. */
+		mask = (((1U << irq_end) - 1) | (1U << irq_end));
+		mask &= ~((1U << irq_start) - 1);
+
+		reg = PCR_ITSS_IPC0_CONF + sizeof(uint32_t) * i;
+		pcr_rmw32(port, reg, ~mask, (mask & irq_snapshot[i]));
+	}
+
+	show_irq_polarities("After");
+}