soc/intel/common: Add Intel PCIe common code

Add PCIe code support under soc/intel/common/block
to initialize PCIe controller, allocate resources
and configure L1 substate latency.

Change-Id: I0c374317a3fe0be0bb1c5d9b16fcbc5cad83ca42
Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-on: https://review.coreboot.org/19665
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>

3 files changed, 161 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/pcie/Kconfig b/src/soc/intel/common/block/pcie/Kconfig
new file mode 100644
index 0000000000..c30d07e51e
--- /dev/null
+++ b/src/soc/intel/common/block/pcie/Kconfig
@@ -0,0 +1,11 @@
+config SOC_INTEL_COMMON_BLOCK_PCIE
+	bool
+	help
+	  Intel Processor common PCIE support
+
+config PCIE_DEBUG_INFO
+	bool
+	help
+	  Enable debug logs in PCIe module. Allows debug information on memory
+	  base and limit, prefetchable memory base and limit, prefetchable memory
+	  base upper 32 bits and prefetchable memory limit upper 32 bits.
diff --git a/src/soc/intel/common/block/pcie/Makefile.inc b/src/soc/intel/common/block/pcie/Makefile.inc
new file mode 100644
index 0000000000..ac311a7abd
--- /dev/null
+++ b/src/soc/intel/common/block/pcie/Makefile.inc
@@ -0,0 +1 @@
+ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_PCIE) += pcie.c
diff --git a/src/soc/intel/common/block/pcie/pcie.c b/src/soc/intel/common/block/pcie/pcie.c
new file mode 100644
index 0000000000..dfc92fed27
--- /dev/null
+++ b/src/soc/intel/common/block/pcie/pcie.c
@@ -0,0 +1,149 @@
+/*
+ * 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 <console/console.h>
+#include <device/pci.h>
+#include <device/pciexp.h>
+#include <device/pci_def.h>
+#include <device/pci_ids.h>
+
+#define CACHE_LINE_SIZE	0x10
+/* Latency tolerance reporting, max non-snoop latency value 3.14ms */
+#define PCIE_LTR_MAX_NO_SNOOP_LATENCY_VALUE	0x1003
+/* Latency tolerance reporting, max snoop latency value 3.14ms */
+#define PCIE_LTR_MAX_SNOOP_LATENCY_VALUE	0x1003
+
+static void pch_pcie_init(struct device *dev)
+{
+	u16 reg16;
+
+	printk(BIOS_DEBUG, "Initializing PCH PCIe bridge.\n");
+
+	/* Enable SERR */
+	pci_or_config32(dev, PCI_COMMAND, PCI_COMMAND_SERR);
+
+	/* Enable Bus Master */
+	pci_or_config32(dev, PCI_COMMAND, PCI_COMMAND_MASTER);
+
+	/* Set Cache Line Size to 0x10 */
+	pci_write_config8(dev, PCI_CACHE_LINE_SIZE, CACHE_LINE_SIZE);
+
+	/* disable parity error response, enable ISA */
+	pci_update_config16(dev, PCI_BRIDGE_CONTROL, ~1, 1<<2);
+
+	if (IS_ENABLED(CONFIG_PCIE_DEBUG_INFO)) {
+		printk(BIOS_SPEW, "    MBL    = 0x%08x\n",
+				pci_read_config32(dev, PCI_MEMORY_BASE));
+		printk(BIOS_SPEW, "    PMBL   = 0x%08x\n",
+				pci_read_config32(dev, PCI_PREF_MEMORY_BASE));
+		printk(BIOS_SPEW, "    PMBU32 = 0x%08x\n",
+				pci_read_config32(dev, PCI_PREF_BASE_UPPER32));
+		printk(BIOS_SPEW, "    PMLU32 = 0x%08x\n",
+				pci_read_config32(dev, PCI_PREF_LIMIT_UPPER32));
+	}
+
+	/* Clear errors in status registers */
+	reg16 = pci_read_config16(dev, PCI_STATUS);
+	pci_write_config16(dev, PCI_STATUS, reg16);
+	reg16 = pci_read_config16(dev, PCI_SEC_STATUS);
+	pci_write_config16(dev, PCI_SEC_STATUS, reg16);
+}
+
+static void pcie_set_L1_ss_max_latency(device_t dev, unsigned int offset)
+{
+	/* Set max snoop and non-snoop latency for the SOC */
+	pci_write_config32(dev, offset,
+			PCIE_LTR_MAX_NO_SNOOP_LATENCY_VALUE << 16 |
+			PCIE_LTR_MAX_SNOOP_LATENCY_VALUE);
+}
+
+static struct pci_operations pcie_ops = {
+	.set_L1_ss_latency = pcie_set_L1_ss_max_latency,
+};
+
+static struct device_operations device_ops = {
+	.read_resources		= pci_bus_read_resources,
+	.set_resources		= pci_dev_set_resources,
+	.enable_resources		= pci_bus_enable_resources,
+	.init		= pch_pcie_init,
+	.scan_bus		= pciexp_scan_bridge,
+	.ops_pci		= &pcie_ops,
+};
+
+static const unsigned short pcie_device_ids[] = {
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP1,
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP2,
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP3,
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP4,
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP5,
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP6,
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP7,
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP8,
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP9,
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP10,
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP11,
+	PCI_DEVICE_ID_INTEL_SPT_LP_PCIE_RP12,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP1,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP2,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP3,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP4,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP5,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP6,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP7,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP8,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP9,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP10,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP11,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP12,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP13,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP14,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP15,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP16,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP17,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP18,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP19,
+	PCI_DEVICE_ID_INTEL_SPT_H_PCIE_RP20,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP1,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP2,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP3,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP4,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP5,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP6,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP7,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP8,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP9,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP10,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP11,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP12,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP13,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP14,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP15,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP16,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP17,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP18,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP19,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP20,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP21,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP22,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP23,
+	PCI_DEVICE_ID_INTEL_KBP_H_PCIE_RP24,
+	0
+};
+
+static const struct pci_driver pch_pcie __pci_driver = {
+	.ops	= &device_ops,
+	.vendor	= PCI_VENDOR_ID_INTEL,
+	.devices	= pcie_device_ids,
+};