1 files changed, 267 insertions, 0 deletions
diff --git a/src/southbridge/intel/lynxpoint/serialio.c b/src/southbridge/intel/lynxpoint/serialio.c
new file mode 100644
index 0000000000..11d6a36b44
--- /dev/null
+++ b/src/southbridge/intel/lynxpoint/serialio.c
@@ -0,0 +1,267 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pciexp.h>
+#include <device/pci_ids.h>
+#include <stdlib.h>
+#include "pch.h"
+#include "nvs.h"
+
+/* Put Serial IO D21:F0-F6 device into desired mode. */
+static void serialio_d21_mode(int sio_index, int int_pin, int acpi_mode)
+{
+	u32 portctrl = SIO_IOBP_PORTCTRL_PM_CAP_PRSNT;
+
+	/* Snoop select 1. */
+	portctrl |= SIO_IOBP_PORTCTRL_SNOOP_SELECT(1);
+
+	/* Set interrupt pin. */
+	portctrl |= SIO_IOBP_PORTCTRL_INT_PIN(int_pin);
+
+	if (acpi_mode) {
+		/* Enable ACPI interrupt mode. */
+		portctrl |= SIO_IOBP_PORTCTRL_ACPI_IRQ_EN;
+
+		/* Disable PCI config space. */
+		portctrl |= SIO_IOBP_PORTCTRL_PCI_CONF_DIS;
+	}
+
+	pch_iobp_update(SIO_IOBP_PORTCTRLX(sio_index), 0, portctrl);
+}
+
+/* Put Serial IO D23:F0 device into desired mode. */
+static void serialio_d23_mode(int acpi_mode)
+{
+	u32 portctrl = 0;
+
+	/* Snoop select 1. */
+	pch_iobp_update(SIO_IOBP_PORTCTRL1, 0,
+			SIO_IOBP_PORTCTRL1_SNOOP_SELECT(1));
+
+	if (acpi_mode) {
+		/* Enable ACPI interrupt mode. */
+		portctrl |= SIO_IOBP_PORTCTRL0_ACPI_IRQ_EN;
+
+		/* Disable PCI config space. */
+		portctrl |= SIO_IOBP_PORTCTRL0_PCI_CONF_DIS;
+	}
+
+	pch_iobp_update(SIO_IOBP_PORTCTRL0, 0, portctrl);
+}
+
+/* Enable LTR Auto Mode for D21:F1-F6. */
+static void serialio_d21_ltr(struct resource *bar0)
+{
+	u32 reg;
+
+	/* 1. Program BAR0 + 808h[2] = 0b */
+	reg = read32(bar0->base + SIO_REG_PPR_GEN);
+	reg &= ~SIO_REG_PPR_GEN_LTR_MODE_MASK;
+	write32(bar0->base + SIO_REG_PPR_GEN, reg);
+
+	/* 2. Program BAR0 + 804h[1:0] = 00b */
+	reg = read32(bar0->base + SIO_REG_PPR_RST);
+	reg &= ~SIO_REG_PPR_RST_ASSERT;
+	write32(bar0->base + SIO_REG_PPR_RST, reg);
+
+	/* 3. Program BAR0 + 804h[1:0] = 11b */
+	reg = read32(bar0->base + SIO_REG_PPR_RST);
+	reg |= SIO_REG_PPR_RST_ASSERT;
+	write32(bar0->base + SIO_REG_PPR_RST, reg);
+
+	/* 4. Program BAR0 + 814h[31:0] = 00000000h */
+	write32(bar0->base + SIO_REG_AUTO_LTR, 0);
+}
+
+/* Enable LTR Auto Mode for D23:F0. */
+static void serialio_d23_ltr(struct resource *bar0)
+{
+	u32 reg;
+
+	/* Program BAR0 + 1008h[2] = 1b */
+	reg = read32(bar0->base + SIO_REG_SDIO_PPR_GEN);
+	reg |= SIO_REG_PPR_GEN_LTR_MODE_MASK;
+	write32(bar0->base + SIO_REG_SDIO_PPR_GEN, reg);
+
+	/* Program BAR0 + 1010h = 0x00000000 */
+	write32(bar0->base + SIO_REG_SDIO_PPR_SW_LTR, 0);
+
+	/* Program BAR0 + 3Ch[30] = 1b */
+	reg = read32(bar0->base + SIO_REG_SDIO_PPR_CMD12);
+	reg |= SIO_REG_SDIO_PPR_CMD12_B30;
+	write32(bar0->base + SIO_REG_SDIO_PPR_CMD12, reg);
+}
+
+/* Select I2C voltage of 1.8V or 3.3V. */
+static void serialio_i2c_voltage_sel(struct resource *bar0, u8 voltage)
+{
+	u32 reg32 = read32(bar0->base + SIO_REG_PPR_GEN);
+	reg32 &= ~SIO_REG_PPR_GEN_VOLTAGE_MASK;
+	reg32 |= SIO_REG_PPR_GEN_VOLTAGE(voltage);
+	write32(bar0->base + SIO_REG_PPR_GEN, reg32);
+}
+
+/* Init sequence to be run once, done as part of D21:F0 (SDMA) init. */
+static void serialio_init_once(int acpi_mode)
+{
+	if (acpi_mode) {
+		/* Enable ACPI IRQ for IRQ13, IRQ7, IRQ6, IRQ5 in RCBA. */
+		RCBA32_OR(ACPIIRQEN, (1 << 13)|(1 << 7)|(1 << 6)|(1 << 5));
+	}
+
+	/* Program IOBP CB000154h[12,9:8,4:0] = 1001100011111b. */
+	pch_iobp_update(SIO_IOBP_GPIODF, ~0x0000131f, 0x0000131f);
+
+	/* Program IOBP CB000180h[5:0] = 111111b (undefined register) */
+	pch_iobp_update(0xcb000180, ~0x0000003f, 0x0000003f);
+}
+
+static void serialio_init(struct device *dev)
+{
+	struct southbridge_intel_lynxpoint_config *config = dev->chip_info;
+	struct resource *bar0, *bar1;
+	int sio_index = -1;
+
+	printk(BIOS_DEBUG, "Initializing Serial IO device\n");
+
+	/* Find BAR0 and BAR1 */
+	bar0 = find_resource(dev, PCI_BASE_ADDRESS_0);
+	if (!bar0)
+		return;
+	bar1 = find_resource(dev, PCI_BASE_ADDRESS_1);
+	if (!bar1)
+		return;
+
+	switch (dev->path.pci.devfn) {
+	case PCI_DEVFN(21, 0): /* SDMA */
+		sio_index = SIO_ID_SDMA;
+		serialio_init_once(config->sio_acpi_mode);
+		serialio_d21_mode(sio_index, SIO_PIN_INTB,
+				  config->sio_acpi_mode);
+		break;
+	case PCI_DEVFN(21, 1): /* I2C0 */
+		sio_index = SIO_ID_I2C0;
+		serialio_d21_ltr(bar0);
+		serialio_i2c_voltage_sel(bar0, config->sio_i2c0_voltage);
+		serialio_d21_mode(sio_index, SIO_PIN_INTC,
+				  config->sio_acpi_mode);
+		break;
+	case PCI_DEVFN(21, 2): /* I2C1 */
+		sio_index = SIO_ID_I2C1;
+		serialio_d21_ltr(bar0);
+		serialio_i2c_voltage_sel(bar0, config->sio_i2c1_voltage);
+		serialio_d21_mode(sio_index, SIO_PIN_INTC,
+				  config->sio_acpi_mode);
+		break;
+	case PCI_DEVFN(21, 3): /* SPI0 */
+		sio_index = SIO_ID_SPI0;
+		serialio_d21_ltr(bar0);
+		serialio_d21_mode(sio_index, SIO_PIN_INTC,
+				  config->sio_acpi_mode);
+		break;
+	case PCI_DEVFN(21, 4): /* SPI1 */
+		sio_index = SIO_ID_SPI1;
+		serialio_d21_ltr(bar0);
+		serialio_d21_mode(sio_index, SIO_PIN_INTC,
+				  config->sio_acpi_mode);
+		break;
+	case PCI_DEVFN(21, 5): /* UART0 */
+		sio_index = SIO_ID_UART0;
+		serialio_d21_ltr(bar0);
+		serialio_d21_mode(sio_index, SIO_PIN_INTD,
+				  config->sio_acpi_mode);
+		break;
+	case PCI_DEVFN(21, 6): /* UART1 */
+		sio_index = SIO_ID_UART1;
+		serialio_d21_ltr(bar0);
+		serialio_d21_mode(sio_index, SIO_PIN_INTD,
+				  config->sio_acpi_mode);
+		break;
+	case PCI_DEVFN(23, 0): /* SDIO */
+		sio_index = SIO_ID_SDIO;
+		serialio_d23_ltr(bar0);
+		serialio_d23_mode(config->sio_acpi_mode);
+		break;
+	default:
+		return;
+	}
+
+	if (config->sio_acpi_mode) {
+		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 */
+		gnvs->s0b[sio_index] = (u32)bar0->base;
+		gnvs->s1b[sio_index] = (u32)bar1->base;
+	}
+}
+
+static void serialio_set_subsystem(device_t dev, unsigned vendor,
+				   unsigned device)
+{
+	if (!vendor || !device) {
+		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
+				pci_read_config32(dev, PCI_VENDOR_ID));
+	} else {
+		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
+				((device & 0xffff) << 16) | (vendor & 0xffff));
+	}
+}
+
+static struct pci_operations pci_ops = {
+	.set_subsystem		= serialio_set_subsystem,
+};
+
+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			= serialio_init,
+	.ops_pci		= &pci_ops,
+};
+
+static const unsigned short pci_device_ids[] = {
+	0x9c60, /* 0:15.0 - SDMA */
+	0x9c61, /* 0:15.1 - I2C0 */
+	0x9c62, /* 0:15.2 - I2C1 */
+	0x9c65, /* 0:15.3 - SPI0 */
+	0x9c66, /* 0:15.4 - SPI1 */
+	0x9c63, /* 0:15.5 - UART0 */
+	0x9c64, /* 0:15.6 - UART1 */
+	0x9c35, /* 0:17.0 - SDIO */
+	0
+};
+
+static const struct pci_driver pch_pcie __pci_driver = {
+	.ops	 = &device_ops,
+	.vendor	 = PCI_VENDOR_ID_INTEL,
+	.devices = pci_device_ids,
+};