soc/intel/common/block: Add LPC Common code and use it for APL

Add LPC common code to be shared across Intel platforms.
Also add LPC library functions to be shared across platforms.

Use common LPC code for Apollo Lake soc. Update existing Apollolake
mainboard variants {google,intel,siemens} to use new common
LPC header file.

Change-Id: I6ac2e9c195b9ecda97415890cc615f4efb04a27a
Signed-off-by: Ravi Sarawadi <ravishankar.sarawadi@intel.com>
Reviewed-on: https://review.coreboot.org/20659
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

5 files changed, 417 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/lpc/Kconfig b/src/soc/intel/common/block/lpc/Kconfig
new file mode 100644
index 0000000000..c384c343f3
--- /dev/null
+++ b/src/soc/intel/common/block/lpc/Kconfig
@@ -0,0 +1,5 @@
+config SOC_INTEL_COMMON_BLOCK_LPC
+	bool
+	help
+	  Use common LPC code for platform. Only soc specific code needs to
+	  be implemented as per requirement.
diff --git a/src/soc/intel/common/block/lpc/Makefile.inc b/src/soc/intel/common/block/lpc/Makefile.inc
new file mode 100644
index 0000000000..428ade9ade
--- /dev/null
+++ b/src/soc/intel/common/block/lpc/Makefile.inc
@@ -0,0 +1,6 @@
+bootblock-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPC) += lpc_lib.c
+
+romstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPC) += lpc_lib.c
+
+ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPC) += lpc_lib.c
+ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_LPC) += lpc.c
diff --git a/src/soc/intel/common/block/lpc/lpc.c b/src/soc/intel/common/block/lpc/lpc.c
new file mode 100644
index 0000000000..0559d95399
--- /dev/null
+++ b/src/soc/intel/common/block/lpc/lpc.c
@@ -0,0 +1,123 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corp.
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <intelblocks/lpc_lib.h>
+#include <soc/acpi.h>
+#include <soc/pm.h>
+
+/* Common weak definition, needs to be implemented in each soc LPC driver. */
+__attribute__((weak)) void lpc_init(struct device *dev) { /* no-op */ }
+
+static void soc_lpc_add_io_resources(device_t dev)
+{
+	struct resource *res;
+
+	/* Add the default claimed legacy IO range for the LPC device. */
+	res = new_resource(dev, 0);
+	res->base = 0;
+	res->size = 0x1000;
+	res->flags = IORESOURCE_IO | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
+}
+
+static void soc_lpc_read_resources(device_t dev)
+{
+	/* Get the PCI resources of this device. */
+	pci_dev_read_resources(dev);
+
+	/* Add IO resources to LPC. */
+	soc_lpc_add_io_resources(dev);
+}
+
+static void set_child_resources(struct device *dev);
+
+static void loop_resources(struct device *dev)
+{
+	struct resource *res;
+
+	for (res = dev->resource_list; res; res = res->next) {
+		if (res->flags & IORESOURCE_IO)
+			lpc_open_pmio_window(res->base, res->size);
+
+		if (res->flags & IORESOURCE_MEM) {
+			/* Check if this is already decoded. */
+			if (lpc_fits_fixed_mmio_window(res->base, res->size))
+				continue;
+
+			lpc_open_mmio_window(res->base, res->size);
+		}
+	}
+	set_child_resources(dev);
+}
+
+/*
+ * Loop through all the child devices' resources, and open up windows to the
+ * LPC bus, as appropriate.
+ */
+static void set_child_resources(struct device *dev)
+{
+	struct bus *link;
+	struct device *child;
+
+	for (link = dev->link_list; link; link = link->next) {
+		for (child = link->children; child; child = child->sibling)
+			loop_resources(child);
+	}
+}
+
+static void set_resources(device_t dev)
+{
+	pci_dev_set_resources(dev);
+
+	/* Now open up windows to devices which have declared resources. */
+	set_child_resources(dev);
+}
+
+static struct device_operations device_ops = {
+	.read_resources = soc_lpc_read_resources,
+	.set_resources = set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.write_acpi_tables = southbridge_write_acpi_tables,
+	.acpi_inject_dsdt_generator = southbridge_inject_dsdt,
+	.init = lpc_init,
+	.scan_bus = scan_lpc_bus,
+};
+
+static const unsigned short pci_device_ids[] = {
+	PCI_DEVICE_ID_INTEL_SPT_LP_SAMPLE,
+	PCI_DEVICE_ID_INTEL_SPT_LP_U_BASE,
+	PCI_DEVICE_ID_INTEL_SPT_LP_U_PREMIUM,
+	PCI_DEVICE_ID_INTEL_SPT_LP_Y_PREMIUM,
+	PCI_DEVICE_ID_INTEL_KBP_H_C236,
+	PCI_DEVICE_ID_INTEL_KBP_H_PREMIUM,
+	PCI_DEVICE_ID_INTEL_KBP_H_QM170,
+	PCI_DEVICE_ID_INTEL_SPT_LP_Y_PREMIUM_HDCP22,
+	PCI_DEVICE_ID_INTEL_SPT_LP_U_PREMIUM_HDCP22,
+	PCI_DEVICE_ID_INTEL_KBP_LP_SUPER_SKU,
+	PCI_DEVICE_ID_INTEL_KBP_LP_U_PREMIUM,
+	PCI_DEVICE_ID_INTEL_KBP_LP_Y_PREMIUM,
+	PCI_DEVICE_ID_INTEL_APL_LPC,
+	PCI_DEVICE_ID_INTEL_GLK_LPC,
+	0
+};
+
+static const struct pci_driver soc_lpc __pci_driver = {
+	.ops = &device_ops,
+	.vendor = PCI_VENDOR_ID_INTEL,
+	.devices = pci_device_ids,
+};
diff --git a/src/soc/intel/common/block/lpc/lpc_def.h b/src/soc/intel/common/block/lpc/lpc_def.h
new file mode 100644
index 0000000000..da73608a70
--- /dev/null
+++ b/src/soc/intel/common/block/lpc/lpc_def.h
@@ -0,0 +1,46 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corp.
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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_COMMON_BLOCK_LPC_DEF_H_
+#define _SOC_COMMON_BLOCK_LPC_DEF_H_
+
+#define LPC_SERIRQ_CTL			0x64
+#define  LPC_SCNT_EN			(1 << 7)
+#define  LPC_SCNT_MODE			(1 << 6)
+#define LPC_IO_DECODE			0x80
+#define  LPC_IOD_COMA_RANGE             (0 << 0) /* 0x3F8 - 0x3FF COMA*/
+#define  LPC_IOD_COMB_RANGE             (1 << 4) /* 0x2F8 - 0x2FF COMB*/
+/* Use IO_<peripheral>_<IO port> style macros defined in lpc_lib.h
+ * to enable decoding of I/O locations for a peripheral. */
+#define LPC_IO_ENABLES			0x82
+#define LPC_GENERIC_IO_RANGE(n)		((((n) & 0x3) * 4) + 0x84)
+#define  LPC_LGIR_AMASK_MASK		(0xfc << 16)
+#define  LPC_LGIR_ADDR_MASK		0xfffc
+#define  LPC_LGIR_EN			(1 << 0)
+#define LPC_LGIR_MAX_WINDOW_SIZE	256
+#define LPC_NUM_GENERIC_IO_RANGES	4
+#define LPC_GENERIC_MEM_RANGE		0x98
+#define  LPC_LGMR_ADDR_MASK		0xffff0000
+#define  LPC_LGMR_EN			(1 << 0)
+#define LPC_LGMR_WINDOW_SIZE		(64 * KiB)
+#define LPC_BIOS_CNTL			0xdc
+#define  LPC_BC_BILD			(1 << 7) /* BILD */
+#define  LPC_BC_LE			(1 << 2) /* LE */
+#define  LPC_BC_EISS			(1 << 5) /* EISS */
+#define LPC_PCCTL			0xE0 /* PCI Clock Control */
+#define  LPC_PCCTL_CLKRUN_EN		(1 << 0)
+
+#endif /* _SOC_COMMON_BLOCK_LPC_DEF_H_ */
diff --git a/src/soc/intel/common/block/lpc/lpc_lib.c b/src/soc/intel/common/block/lpc/lpc_lib.c
new file mode 100644
index 0000000000..6b5f29a038
--- /dev/null
+++ b/src/soc/intel/common/block/lpc/lpc_lib.c
@@ -0,0 +1,237 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Intel Corp.
+ * (Written by Alexandru Gagniuc <alexandrux.gagniuc@intel.com> for Intel Corp.)
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#define __SIMPLE_DEVICE__
+
+#include <assert.h>
+#include <console/console.h>
+#include <device/pci.h>
+#include <intelblocks/lpc_lib.h>
+#include <lib.h>
+#include "lpc_def.h"
+#include <soc/pci_devs.h>
+
+void lpc_enable_fixed_io_ranges(uint16_t io_enables)
+{
+	uint16_t reg_io_enables;
+
+	reg_io_enables = pci_read_config16(PCH_DEV_LPC, LPC_IO_ENABLES);
+	io_enables |= reg_io_enables;
+	pci_write_config16(PCH_DEV_LPC, LPC_IO_ENABLES, io_enables);
+}
+
+/*
+ * Find the first unused IO window.
+ * Returns -1 if not found, 0 for reg 0x84, 1 for reg 0x88 ...
+ */
+static int find_unused_pmio_window(void)
+{
+	int i;
+	uint32_t lgir;
+
+	for (i = 0; i < LPC_NUM_GENERIC_IO_RANGES; i++) {
+		lgir = pci_read_config32(PCH_DEV_LPC, LPC_GENERIC_IO_RANGE(i));
+
+		if (!(lgir & LPC_LGIR_EN))
+			return i;
+	}
+
+	return -1;
+}
+
+void lpc_close_pmio_windows(void)
+{
+	size_t i;
+
+	for (i = 0; i < LPC_NUM_GENERIC_IO_RANGES; i++)
+		pci_write_config32(PCH_DEV_LPC, LPC_GENERIC_IO_RANGE(i), 0);
+}
+
+void lpc_open_pmio_window(uint16_t base, uint16_t size)
+{
+	int lgir_reg_num;
+	uint32_t lgir_reg_offset, lgir, window_size, alignment;
+	resource_t bridged_size, bridge_base;
+
+	printk(BIOS_SPEW, "LPC: Trying to open IO window from %x size %x\n",
+				base, size);
+
+	bridged_size = 0;
+	bridge_base = base;
+
+	while (bridged_size < size) {
+		lgir_reg_num = find_unused_pmio_window();
+		if (lgir_reg_num < 0) {
+			printk(BIOS_ERR,
+				"LPC: Cannot open IO window: %llx size %llx\n",
+				bridge_base, size - bridged_size);
+			printk(BIOS_ERR, "No more IO windows\n");
+			return;
+		}
+		lgir_reg_offset = LPC_GENERIC_IO_RANGE(lgir_reg_num);
+
+		/* Each IO range register can only open a 256-byte window. */
+		window_size = MIN(size, LPC_LGIR_MAX_WINDOW_SIZE);
+
+		/* Window size must be a power of two for the AMASK to work. */
+		alignment = 1 << (log2_ceil(window_size));
+		window_size = ALIGN_UP(window_size, alignment);
+
+		/* Address[15:2] in LGIR[15:12] and Mask[7:2] in LGIR[23:18]. */
+		lgir = (bridge_base & LPC_LGIR_ADDR_MASK) | LPC_LGIR_EN;
+		lgir |= ((window_size - 1) << 16) & LPC_LGIR_AMASK_MASK;
+
+		pci_write_config32(PCH_DEV_LPC, lgir_reg_offset, lgir);
+
+		printk(BIOS_DEBUG,
+		       "LPC: Opened IO window LGIR%d: base %llx size %x\n",
+		       lgir_reg_num, bridge_base, window_size);
+
+		bridged_size += window_size;
+		bridge_base += window_size;
+	}
+}
+
+void lpc_open_mmio_window(uintptr_t base, size_t size)
+{
+	uint32_t lgmr;
+
+	lgmr = pci_read_config32(PCH_DEV_LPC, LPC_GENERIC_MEM_RANGE);
+
+	if (lgmr & LPC_LGMR_EN) {
+		printk(BIOS_ERR,
+		       "LPC: Cannot open window to resource %lx size %zx\n",
+		       base, size);
+		printk(BIOS_ERR, "LPC: MMIO window already in use\n");
+		return;
+	}
+
+	if (size > LPC_LGMR_WINDOW_SIZE) {
+		printk(BIOS_WARNING,
+		       "LPC:  Resource %lx size %zx larger than window(%x)\n",
+		       base, size, LPC_LGMR_WINDOW_SIZE);
+	}
+
+	lgmr = (base & LPC_LGMR_ADDR_MASK) | LPC_LGMR_EN;
+
+	pci_write_config32(PCH_DEV_LPC, LPC_GENERIC_MEM_RANGE, lgmr);
+}
+
+bool lpc_fits_fixed_mmio_window(uintptr_t base, size_t size)
+{
+	resource_t res_end, range_end;
+	const struct lpc_mmio_range *range;
+	const struct lpc_mmio_range *lpc_fixed_mmio_ranges =
+		soc_get_fixed_mmio_ranges();
+
+	for (range = lpc_fixed_mmio_ranges; range->size; range++) {
+		range_end = range->base + range->size;
+		res_end = base + size;
+
+		if ((base >= range->base) && (res_end <= range_end)) {
+			printk(BIOS_DEBUG,
+			       "Resource %lx size %zx fits in fixed window"
+			       " %lx size %zx\n",
+			       base, size, range->base, range->size);
+			return true;
+		}
+	}
+	return false;
+}
+
+/*
+ * Set FAST_SPIBAR BIOS Control register based on input bit field.
+ */
+static void lpc_set_bios_control_reg(uint8_t bios_cntl_bit)
+{
+	device_t dev = PCH_DEV_LPC;
+	uint8_t bc_cntl;
+
+	assert((bios_cntl_bit & (bios_cntl_bit - 1)) == 0);
+	bc_cntl = pci_read_config8(dev, LPC_BIOS_CNTL);
+	bc_cntl |= bios_cntl_bit;
+	pci_write_config8(dev, LPC_BIOS_CNTL, bc_cntl);
+
+	/*
+	* Ensure an additional read back after performing lock down
+	*/
+	pci_read_config8(PCH_DEV_LPC, LPC_BIOS_CNTL);
+}
+
+/*
+* Set LPC BIOS Control BILD bit.
+*/
+void lpc_set_bios_interface_lock_down(void)
+{
+	lpc_set_bios_control_reg(LPC_BC_BILD);
+}
+
+/*
+* Set LPC BIOS Control LE bit.
+*/
+void lpc_set_lock_enable(void)
+{
+	lpc_set_bios_control_reg(LPC_BC_LE);
+}
+
+/*
+* Set LPC BIOS Control EISS bit.
+*/
+void lpc_set_eiss(void)
+{
+	lpc_set_bios_control_reg(LPC_BC_EISS);
+}
+
+/*
+* Set LPC Serial IRQ mode.
+*/
+void lpc_set_serirq_mode(enum serirq_mode mode)
+{
+	device_t dev = PCH_DEV_LPC;
+	uint8_t scnt;
+
+	scnt = pci_read_config8(dev, LPC_SERIRQ_CTL);
+	scnt &= ~(LPC_SCNT_EN | LPC_SCNT_MODE);
+
+	switch (mode) {
+	case SERIRQ_QUIET:
+		scnt |= LPC_SCNT_EN;
+		break;
+	case SERIRQ_CONTINUOUS:
+		scnt |= LPC_SCNT_EN | LPC_SCNT_MODE;
+		break;
+	case SERIRQ_OFF:
+	default:
+		break;
+	}
+
+	pci_write_config8(dev, LPC_SERIRQ_CTL, scnt);
+}
+
+
+void lpc_io_setup_comm_a_b(void)
+{
+	/*
+	* Setup I/O Decode Range Register for LPC
+	* ComA Range 3F8h-3FFh [2:0]
+	* ComB Range 2F8h-2FFh [6:4]
+	*/
+	pci_write_config16(PCH_DEV_LPC, LPC_IO_DECODE,
+			LPC_IOD_COMA_RANGE | LPC_IOD_COMB_RANGE);
+	/* Enable ComA and ComB Port */
+	lpc_enable_fixed_io_ranges(LPC_IOE_COMA_EN | LPC_IOE_COMB_EN);
+}