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-rw-r--r--src/soc/intel/skylake/Kconfig5
-rw-r--r--src/soc/intel/skylake/chip.h5
-rw-r--r--src/soc/intel/skylake/i2c.c50
-rw-r--r--src/soc/intel/skylake/include/soc/iomap.h3
-rw-r--r--src/soc/intel/skylake/include/soc/pci_devs.h29
-rw-r--r--src/soc/intel/skylake/include/soc/romstage.h1
-rw-r--r--src/soc/intel/skylake/romstage/Makefile.inc2
-rw-r--r--src/soc/intel/skylake/romstage/i2c.c97
-rw-r--r--src/soc/intel/skylake/romstage/romstage.c1
9 files changed, 193 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/Kconfig b/src/soc/intel/skylake/Kconfig
index 9278cf1aa2..a134d1c500 100644
--- a/src/soc/intel/skylake/Kconfig
+++ b/src/soc/intel/skylake/Kconfig
@@ -37,6 +37,7 @@ config CPU_SPECIFIC_OPTIONS
select RELOCATABLE_RAMSTAGE
select SOC_INTEL_COMMON
select SOC_INTEL_COMMON_ACPI_WAKE_SOURCE
+ select SOC_INTEL_COMMON_LPSS_I2C
select SOC_INTEL_COMMON_RESET
select SMM_TSEG
select SMP
@@ -72,6 +73,10 @@ config CPU_ADDR_BITS
int
default 36
+config SOC_INTEL_COMMON_LPSS_I2C_CLOCK_MHZ
+ int
+ default 120
+
config DCACHE_RAM_BASE
hex "Base address of cache-as-RAM"
default 0xfef00000
diff --git a/src/soc/intel/skylake/chip.h b/src/soc/intel/skylake/chip.h
index 1d3113f481..fe03e59451 100644
--- a/src/soc/intel/skylake/chip.h
+++ b/src/soc/intel/skylake/chip.h
@@ -20,6 +20,7 @@
#define _SOC_CHIP_H_
#include <arch/acpi_device.h>
+#include <device/i2c.h>
#include <stdint.h>
#include <soc/gpio_defs.h>
#include <soc/gpe.h>
@@ -39,6 +40,10 @@ enum skylake_i2c_voltage {
struct skylake_i2c_config {
/* Bus voltage level, default is 3.3V */
enum skylake_i2c_voltage voltage;
+ /* Bus speed in Hz, default is I2C_SPEED_FAST (400 KHz) */
+ enum i2c_speed speed;
+ /* Bus should be enabled prior to ramstage with temporary base */
+ int early_init;
};
struct soc_intel_skylake_config {
diff --git a/src/soc/intel/skylake/i2c.c b/src/soc/intel/skylake/i2c.c
index 76e7bf1015..64d39cddb2 100644
--- a/src/soc/intel/skylake/i2c.c
+++ b/src/soc/intel/skylake/i2c.c
@@ -14,16 +14,66 @@
*/
#include <device/device.h>
+#include <device/i2c.h>
#include <device/pci.h>
#include <device/pci_ids.h>
+#include <soc/intel/common/lpss_i2c.h>
#include <soc/ramstage.h>
+uintptr_t lpss_i2c_base_address(unsigned bus)
+{
+ unsigned devfn;
+ struct device *dev;
+ struct resource *res;
+
+ /* bus -> devfn */
+ devfn = i2c_bus_to_devfn(bus);
+ if (devfn >= 0) {
+ /* devfn -> dev */
+ dev = dev_find_slot(0, devfn);
+ if (dev) {
+ /* dev -> bar0 */
+ res = find_resource(dev, PCI_BASE_ADDRESS_0);
+ if (res)
+ return res->base;
+ }
+ }
+
+ return (uintptr_t)NULL;
+}
+
+static int i2c_dev_to_bus(struct device *dev)
+{
+ return i2c_devfn_to_bus(dev->path.pci.devfn);
+}
+
+/*
+ * The device should already be enabled and out of reset,
+ * either from early init in coreboot or SiliconInit in FSP.
+ */
+static void i2c_dev_init(struct device *dev)
+{
+ struct soc_intel_skylake_config *config = dev->chip_info;
+ int bus = i2c_dev_to_bus(dev);
+
+ if (!config || bus < 0)
+ return;
+
+ lpss_i2c_init(bus, config->i2c[bus].speed ? : I2C_SPEED_FAST);
+}
+
+static struct i2c_bus_operations i2c_bus_ops = {
+ .dev_to_bus = &i2c_dev_to_bus,
+};
+
static struct device_operations i2c_dev_ops = {
.read_resources = &pci_dev_read_resources,
.set_resources = &pci_dev_set_resources,
.enable_resources = &pci_dev_enable_resources,
.scan_bus = &scan_smbus,
.ops_pci = &soc_pci_ops,
+ .ops_i2c_bus = &i2c_bus_ops,
+ .init = &i2c_dev_init,
};
static const unsigned short pci_device_ids[] = {
diff --git a/src/soc/intel/skylake/include/soc/iomap.h b/src/soc/intel/skylake/include/soc/iomap.h
index 038fe7da70..feba3027e7 100644
--- a/src/soc/intel/skylake/include/soc/iomap.h
+++ b/src/soc/intel/skylake/include/soc/iomap.h
@@ -29,6 +29,9 @@
#define UART_DEBUG_BASE_ADDRESS 0xfe034000
#define UART_DEBUG_BASE_SIZE 0x1000
+#define EARLY_I2C_BASE_ADDRESS 0xfe040000
+#define EARLY_I2C_BASE(x) (EARLY_I2C_BASE_ADDRESS + (0x1000 * (x)))
+
#define MCH_BASE_ADDRESS 0xfed10000
#define MCH_BASE_SIZE 0x8000
diff --git a/src/soc/intel/skylake/include/soc/pci_devs.h b/src/soc/intel/skylake/include/soc/pci_devs.h
index 74fd1c57b6..476e2c6a56 100644
--- a/src/soc/intel/skylake/include/soc/pci_devs.h
+++ b/src/soc/intel/skylake/include/soc/pci_devs.h
@@ -17,6 +17,7 @@
#ifndef _SOC_PCI_DEVS_H_
#define _SOC_PCI_DEVS_H_
+#include <device/pci_def.h>
#include <rules.h>
#define _SA_DEVFN(slot) PCI_DEVFN(SA_DEV_SLOT_ ## slot, 0)
@@ -147,4 +148,32 @@
#define PCH_DEV_SPI _PCH_DEV(LPC, 5)
#define PCH_DEV_GBE _PCH_DEV(LPC, 6)
+/* Convert I2C bus number to PCI device and function */
+static inline int i2c_bus_to_devfn(unsigned bus)
+{
+ switch (bus) {
+ case 0: return PCH_DEVFN_I2C0;
+ case 1: return PCH_DEVFN_I2C1;
+ case 2: return PCH_DEVFN_I2C2;
+ case 3: return PCH_DEVFN_I2C3;
+ case 4: return PCH_DEVFN_I2C4;
+ case 5: return PCH_DEVFN_I2C5;
+ }
+ return -1;
+}
+
+/* Convert PCI device and function to I2C bus number */
+static inline int i2c_devfn_to_bus(unsigned devfn)
+{
+ switch (devfn) {
+ case PCH_DEVFN_I2C0: return 0;
+ case PCH_DEVFN_I2C1: return 1;
+ case PCH_DEVFN_I2C2: return 2;
+ case PCH_DEVFN_I2C3: return 3;
+ case PCH_DEVFN_I2C4: return 4;
+ case PCH_DEVFN_I2C5: return 5;
+ }
+ return -1;
+}
+
#endif
diff --git a/src/soc/intel/skylake/include/soc/romstage.h b/src/soc/intel/skylake/include/soc/romstage.h
index 7fab8ce549..56bace15a7 100644
--- a/src/soc/intel/skylake/include/soc/romstage.h
+++ b/src/soc/intel/skylake/include/soc/romstage.h
@@ -19,6 +19,7 @@
#include <fsp/romstage.h>
+void i2c_early_init(void);
void systemagent_early_init(void);
void pch_early_init(void);
void pch_uart_init(void);
diff --git a/src/soc/intel/skylake/romstage/Makefile.inc b/src/soc/intel/skylake/romstage/Makefile.inc
index 194091f811..6ae81378a4 100644
--- a/src/soc/intel/skylake/romstage/Makefile.inc
+++ b/src/soc/intel/skylake/romstage/Makefile.inc
@@ -1,4 +1,5 @@
verstage-y += cpu.c
+verstage-y += i2c.c
verstage-y += pch.c
verstage-y += power_state.c
verstage-y += report_platform.c
@@ -9,6 +10,7 @@ verstage-y += systemagent.c
verstage-y += uart.c
romstage-y += cpu.c
+romstage-y += i2c.c
romstage-y += pch.c
romstage-y += power_state.c
romstage-y += report_platform.c
diff --git a/src/soc/intel/skylake/romstage/i2c.c b/src/soc/intel/skylake/romstage/i2c.c
new file mode 100644
index 0000000000..64e692420e
--- /dev/null
+++ b/src/soc/intel/skylake/romstage/i2c.c
@@ -0,0 +1,97 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 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 <arch/io.h>
+#include <commonlib/helpers.h>
+#include <device/device.h>
+#include <device/i2c.h>
+#include <device/pci_def.h>
+#include <soc/intel/common/lpss_i2c.h>
+#include <soc/iomap.h>
+#include <soc/pci_devs.h>
+#include <soc/romstage.h>
+#include <soc/serialio.h>
+#include "chip.h"
+
+uintptr_t lpss_i2c_base_address(unsigned bus)
+{
+ unsigned devfn;
+ pci_devfn_t dev;
+
+ /* Find device+function for this controller */
+ devfn = i2c_bus_to_devfn(bus);
+ if (devfn < 0)
+ return 0;
+
+ /* Form a PCI address for this device */
+ dev = PCI_DEV(0, PCI_SLOT(devfn), PCI_FUNC(devfn));
+
+ /* Read the first base address for this device */
+ return ALIGN_DOWN(pci_read_config32(dev, PCI_BASE_ADDRESS_0), 16);
+}
+
+static void i2c_early_init_bus(unsigned bus)
+{
+ ROMSTAGE_CONST struct soc_intel_skylake_config *config;
+ ROMSTAGE_CONST struct device *tree_dev;
+ pci_devfn_t dev;
+ unsigned devfn;
+ uintptr_t base;
+ uint32_t value;
+ void *reg;
+
+ /* Find the PCI device for this bus controller */
+ devfn = i2c_bus_to_devfn(bus);
+ if (devfn < 0)
+ return;
+
+ /* Look up the controller device in the devicetree */
+ dev = PCI_DEV(0, PCI_SLOT(devfn), PCI_FUNC(devfn));
+ tree_dev = dev_find_slot(0, devfn);
+ if (!tree_dev || !tree_dev->enabled)
+ return;
+
+ /* Skip if not enabled for early init */
+ config = tree_dev->chip_info;
+ if (!config)
+ return;
+ if (!config->i2c[bus].early_init)
+ return;
+
+ /* Prepare early base address for access before memory */
+ base = EARLY_I2C_BASE(bus);
+ pci_write_config32(dev, PCI_BASE_ADDRESS_0, base);
+ pci_write_config32(dev, PCI_COMMAND,
+ PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
+
+ /* Take device out of reset */
+ reg = (void *)(base + SIO_REG_PPR_RESETS);
+ value = read32(reg);
+ value |= SIO_REG_PPR_RESETS_FUNC | SIO_REG_PPR_RESETS_APB |
+ SIO_REG_PPR_RESETS_IDMA;
+ write32(reg, value);
+
+ /* Initialize the controller */
+ lpss_i2c_init(bus, config->i2c[bus].speed ? : I2C_SPEED_FAST);
+}
+
+void i2c_early_init(void)
+{
+ int bus;
+
+ /* Initialize I2C controllers that are enabled in devicetree */
+ for (bus = 0; bus < SKYLAKE_I2C_DEV_MAX; bus++)
+ i2c_early_init_bus(bus);
+}
diff --git a/src/soc/intel/skylake/romstage/romstage.c b/src/soc/intel/skylake/romstage/romstage.c
index 9c61095214..8375ccde76 100644
--- a/src/soc/intel/skylake/romstage/romstage.c
+++ b/src/soc/intel/skylake/romstage/romstage.c
@@ -64,6 +64,7 @@ void car_soc_post_console_init(void)
report_platform_info();
set_max_freq();
pch_early_init();
+ i2c_early_init();
}
int get_sw_write_protect_state(void)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 19:01:11 +0000