intel/fsp_baytrail: Enable LPSS in ACPI mode

This change fixes LPSS ACPI mode. Previously, enabling ACPI mode would
result in unusable devices, as the resources were set to 0 and the devices
were disabled.
lpss.c was copied from intel/baytrail with a few minor adjustment for the
different config structure.

ACPI mode requires setting PcdLpssSioEnablePciMode==LPSS_PCI_MODE_DISABLE
and applying the patch that disables clearing gnvs.
https://review.coreboot.org/#/c/14040/

This doesn't handle the case where the FSP has PcdLpssSioEnablePciMode
set to disable and the devicetree set to default.

Change-Id: I12fffea3820ed948defe7a4f11af6b6363402560
Signed-off-by: Ben Gardner <gardner.ben@gmail.com>
Reviewed-on: https://review.coreboot.org/14042
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

2 files changed, 203 insertions, 0 deletions

diff --git a/src/soc/intel/fsp_baytrail/Makefile.inc b/src/soc/intel/fsp_baytrail/Makefile.inc
index 65eb55f0b7..92b5f9804f 100644
--- a/src/soc/intel/fsp_baytrail/Makefile.inc
+++ b/src/soc/intel/fsp_baytrail/Makefile.inc
@@ -50,6 +50,7 @@ ramstage-y += reset.c
 ramstage-y += cpu.c
 ramstage-y += acpi.c
 ramstage-y += lpe.c
+ramstage-y += lpss.c
 smm-$(CONFIG_HAVE_SMI_HANDLER) += pmutil.c
 smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
 ramstage-$(CONFIG_HAVE_SMI_HANDLER) += smm.c
diff --git a/src/soc/intel/fsp_baytrail/lpss.c b/src/soc/intel/fsp_baytrail/lpss.c
new file mode 100644
index 0000000000..427fc6da1c
--- /dev/null
+++ b/src/soc/intel/fsp_baytrail/lpss.c
@@ -0,0 +1,202 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google Inc.
+ *
+ * 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 <arch/io.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <reg_script.h>
+
+#include <soc/iosf.h>
+#include <soc/nvs.h>
+#include <soc/pci_devs.h>
+#include <soc/ramstage.h>
+
+#include "chip.h"
+
+static void dev_enable_acpi_mode(device_t dev, int iosf_reg, int nvs_index)
+{
+	struct reg_script ops[] = {
+		/* Disable PCI interrupt, enable Memory and Bus Master */
+		REG_PCI_OR32(PCI_COMMAND,
+			     PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | (1<<10)),
+		/* Enable ACPI mode */
+		REG_IOSF_OR(IOSF_PORT_LPSS, iosf_reg,
+			    LPSS_CTL_PCI_CFG_DIS | LPSS_CTL_ACPI_INT_EN),
+		REG_SCRIPT_END
+	};
+	struct resource *bar;
+	global_nvs_t *gnvs;
+
+	/* Find ACPI NVS to update BARs */
+	gnvs = (global_nvs_t *)cbmem_find(CBMEM_ID_ACPI_GNVS);
+	if (!gnvs) {
+		printk(BIOS_ERR, "Unable to locate Global NVS\n");
+		return;
+	}
+
+	/* Save BAR0 and BAR1 to ACPI NVS */
+	bar = find_resource(dev, PCI_BASE_ADDRESS_0);
+	if (bar)
+		gnvs->dev.lpss_bar0[nvs_index] = (u32)bar->base;
+
+	bar = find_resource(dev, PCI_BASE_ADDRESS_1);
+	if (bar)
+		gnvs->dev.lpss_bar1[nvs_index] = (u32)bar->base;
+
+	/* Device is enabled in ACPI mode */
+	gnvs->dev.lpss_en[nvs_index] = 1;
+
+	/* Put device in ACPI mode */
+	reg_script_run_on_dev(dev, ops);
+}
+
+static void dev_enable_snoop_and_pm(device_t dev, int iosf_reg)
+{
+	struct reg_script ops[] = {
+		REG_IOSF_RMW(IOSF_PORT_LPSS, iosf_reg,
+		             ~(LPSS_CTL_SNOOP | LPSS_CTL_NOSNOOP),
+		             LPSS_CTL_SNOOP | LPSS_CTL_PM_CAP_PRSNT),
+		REG_SCRIPT_END,
+	};
+
+	reg_script_run_on_dev(dev, ops);
+}
+
+static void dev_ctl_reg(device_t dev, int *iosf_reg, int *nvs_index)
+{
+	*iosf_reg = -1;
+	*nvs_index = -1;
+#define SET_IOSF_REG(name_) \
+	case PCI_DEVFN(name_ ## _DEV, name_ ## _FUNC): \
+		*iosf_reg = LPSS_ ## name_ ## _CTL; \
+		*nvs_index = LPSS_NVS_ ## name_
+
+	switch (dev->path.pci.devfn) {
+	SET_IOSF_REG(SIO_DMA1);
+		break;
+	SET_IOSF_REG(I2C1);
+		break;
+	SET_IOSF_REG(I2C2);
+		break;
+	SET_IOSF_REG(I2C3);
+		break;
+	SET_IOSF_REG(I2C4);
+		break;
+	SET_IOSF_REG(I2C5);
+		break;
+	SET_IOSF_REG(I2C6);
+		break;
+	SET_IOSF_REG(I2C7);
+		break;
+	SET_IOSF_REG(SIO_DMA2);
+		break;
+	SET_IOSF_REG(PWM1);
+		break;
+	SET_IOSF_REG(PWM2);
+		break;
+	SET_IOSF_REG(HSUART1);
+		break;
+	SET_IOSF_REG(HSUART2);
+		break;
+	SET_IOSF_REG(SPI);
+		break;
+	}
+}
+
+static void i2c_disable_resets(device_t dev)
+{
+	/* Release the I2C devices from reset. */
+	static const struct reg_script ops[] = {
+		REG_RES_WRITE32(PCI_BASE_ADDRESS_0, 0x804, 0x3),
+		REG_SCRIPT_END,
+	};
+
+#define CASE_I2C(name_) \
+	case PCI_DEVFN(name_ ## _DEV, name_ ## _FUNC)
+
+	switch (dev->path.pci.devfn) {
+	CASE_I2C(I2C1):
+	CASE_I2C(I2C2):
+	CASE_I2C(I2C3):
+	CASE_I2C(I2C4):
+	CASE_I2C(I2C5):
+	CASE_I2C(I2C6):
+	CASE_I2C(I2C7):
+		printk(BIOS_DEBUG, "Releasing I2C device from reset.\n");
+		reg_script_run_on_dev(dev, ops);
+		break;
+	default:
+		return;
+	}
+}
+
+static void lpss_init(device_t dev)
+{
+	struct soc_intel_fsp_baytrail_config *config = dev->chip_info;
+	int iosf_reg, nvs_index;
+
+	dev_ctl_reg(dev, &iosf_reg, &nvs_index);
+
+	if (iosf_reg < 0) {
+		int slot = PCI_SLOT(dev->path.pci.devfn);
+		int func = PCI_FUNC(dev->path.pci.devfn);
+		printk(BIOS_DEBUG, "Could not find iosf_reg for %02x.%01x\n",
+		       slot, func);
+		return;
+	}
+	dev_enable_snoop_and_pm(dev, iosf_reg);
+	i2c_disable_resets(dev);
+
+	if (config->PcdLpssSioEnablePciMode == LPSS_PCI_MODE_DISABLE)
+		dev_enable_acpi_mode(dev, iosf_reg, nvs_index);
+}
+
+static struct device_operations device_ops = {
+	.read_resources		= pci_dev_read_resources,
+	.set_resources		= pci_dev_set_resources,
+	.enable_resources	= pci_dev_enable_resources,
+	.init			= lpss_init,
+	.enable			= NULL,
+	.scan_bus		= NULL,
+	.ops_pci		= &soc_pci_ops,
+};
+
+static const unsigned short pci_device_ids[] = {
+	SIO_DMA1_DEVID,
+	I2C1_DEVID,
+	I2C2_DEVID,
+	I2C3_DEVID,
+	I2C4_DEVID,
+	I2C5_DEVID,
+	I2C6_DEVID,
+	I2C7_DEVID,
+	SIO_DMA2_DEVID,
+	PWM1_DEVID,
+	PWM2_DEVID,
+	HSUART1_DEVID,
+	HSUART2_DEVID,
+	SPI_DEVID,
+	0,
+};
+
+static const struct pci_driver southcluster __pci_driver = {
+	.ops		= &device_ops,
+	.vendor		= PCI_VENDOR_ID_INTEL,
+	.devices	= pci_device_ids,
+};