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/*
* This file is part of the coreboot project.
*
* Copyright 2017-2018 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 <device/pci_ops.h>
#include <console/console.h>
#include <device/device.h>
#include <device/i2c_simple.h>
#include <device/pci.h>
#include <device/pci_def.h>
#include <device/pci_ids.h>
#include <drivers/i2c/designware/dw_i2c.h>
#include <intelblocks/cfg.h>
#include <intelblocks/lpss.h>
#include <soc/iomap.h>
#include <soc/pci_devs.h>
int dw_i2c_soc_dev_to_bus(struct device *dev)
{
pci_devfn_t devfn = dev->path.pci.devfn;
return dw_i2c_soc_devfn_to_bus(devfn);
}
/* Getting I2C bus configuration from devicetree config */
const struct dw_i2c_bus_config *dw_i2c_get_soc_cfg(unsigned int bus)
{
const struct soc_intel_common_config *common_config;
common_config = chip_get_common_soc_structure();
return &common_config->i2c[bus];
}
/* Get base address for early init of I2C controllers. */
uintptr_t dw_i2c_get_soc_early_base(unsigned int bus)
{
return EARLY_I2C_BASE(bus);
}
#if !ENV_PAYLOAD_LOADER
static int lpss_i2c_early_init_bus(unsigned int bus)
{
const struct dw_i2c_bus_config *config;
const struct device *tree_dev;
pci_devfn_t dev;
int devfn;
uintptr_t base;
/* Find the PCI device for this bus controller */
devfn = dw_i2c_soc_bus_to_devfn(bus);
if (devfn < 0) {
printk(BIOS_ERR, "I2C%u device not found\n", bus);
return -1;
}
/* Look up the controller device in the devicetree */
dev = PCI_DEV(0, PCI_SLOT(devfn), PCI_FUNC(devfn));
tree_dev = pcidev_path_on_root(devfn);
if (!tree_dev || !tree_dev->enabled) {
printk(BIOS_ERR, "I2C%u device not enabled\n", bus);
return -1;
}
/* Skip if not enabled for early init */
config = dw_i2c_get_soc_cfg(bus);
if (!config || !config->early_init) {
printk(BIOS_DEBUG, "I2C%u not enabled for early init\n", bus);
return -1;
}
/* Prepare early base address for access before memory */
base = dw_i2c_get_soc_early_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 */
lpss_reset_release(base);
/* Ensure controller is in D0 state */
lpss_set_power_state(tree_dev, STATE_D0);
/* Initialize the controller */
if (dw_i2c_init(bus, config) < 0) {
printk(BIOS_ERR, "I2C%u failed to initialize\n", bus);
return -1;
}
return 0;
}
uintptr_t dw_i2c_base_address(unsigned int bus)
{
int devfn;
pci_devfn_t dev;
uintptr_t base;
/* Find device+function for this controller */
devfn = dw_i2c_soc_bus_to_devfn(bus);
if (devfn < 0)
return (uintptr_t)NULL;
/* 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 */
base = ALIGN_DOWN(pci_read_config32(dev, PCI_BASE_ADDRESS_0), 16);
/* Attempt to initialize bus if base is not set yet */
if (!base && !lpss_i2c_early_init_bus(bus))
base = ALIGN_DOWN(pci_read_config32(dev, PCI_BASE_ADDRESS_0),
16);
return base;
}
#else
uintptr_t dw_i2c_base_address(unsigned int bus)
{
int devfn;
struct device *dev;
struct resource *res;
/* bus -> devfn */
devfn = dw_i2c_soc_bus_to_devfn(bus);
if (devfn < 0)
return (uintptr_t)NULL;
/* devfn -> dev */
dev = pcidev_path_on_root(devfn);
if (!dev || !dev->enabled)
return (uintptr_t)NULL;
/* dev -> bar0 */
res = find_resource(dev, PCI_BASE_ADDRESS_0);
if (res)
return res->base;
return (uintptr_t)NULL;
}
/*
* This function ensures that the device is actually out of reset and
* its ready for initialization sequence.
*/
static void dw_i2c_device_init(struct device *dev)
{
uintptr_t base_address;
int bus = dw_i2c_soc_dev_to_bus(dev);
if (bus < 0)
return;
base_address = dw_i2c_base_address(bus);
if (!base_address)
return;
/* Ensure controller is in D0 state */
lpss_set_power_state(dev, STATE_D0);
/* Take device out of reset if its not done before */
if (lpss_is_controller_in_reset(base_address))
lpss_reset_release(base_address);
dw_i2c_dev_init(dev);
}
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_i2c_bus = &dw_i2c_bus_ops,
.ops_pci = &pci_dev_ops_pci,
.init = dw_i2c_device_init,
.acpi_fill_ssdt_generator = dw_i2c_acpi_fill_ssdt,
};
static const unsigned short pci_device_ids[] = {
PCI_DEVICE_ID_INTEL_SPT_I2C0,
PCI_DEVICE_ID_INTEL_SPT_I2C1,
PCI_DEVICE_ID_INTEL_SPT_I2C2,
PCI_DEVICE_ID_INTEL_SPT_I2C3,
PCI_DEVICE_ID_INTEL_SPT_I2C4,
PCI_DEVICE_ID_INTEL_SPT_I2C5,
PCI_DEVICE_ID_INTEL_KBP_H_I2C0,
PCI_DEVICE_ID_INTEL_KBP_H_I2C1,
PCI_DEVICE_ID_INTEL_KBP_H_I2C2,
PCI_DEVICE_ID_INTEL_KBP_H_I2C3,
PCI_DEVICE_ID_INTEL_APL_I2C0,
PCI_DEVICE_ID_INTEL_APL_I2C1,
PCI_DEVICE_ID_INTEL_APL_I2C2,
PCI_DEVICE_ID_INTEL_APL_I2C3,
PCI_DEVICE_ID_INTEL_APL_I2C4,
PCI_DEVICE_ID_INTEL_APL_I2C5,
PCI_DEVICE_ID_INTEL_APL_I2C6,
PCI_DEVICE_ID_INTEL_APL_I2C7,
PCI_DEVICE_ID_INTEL_CNL_I2C0,
PCI_DEVICE_ID_INTEL_CNL_I2C1,
PCI_DEVICE_ID_INTEL_CNL_I2C2,
PCI_DEVICE_ID_INTEL_CNL_I2C3,
PCI_DEVICE_ID_INTEL_CNL_I2C4,
PCI_DEVICE_ID_INTEL_CNL_I2C5,
PCI_DEVICE_ID_INTEL_GLK_I2C0,
PCI_DEVICE_ID_INTEL_GLK_I2C1,
PCI_DEVICE_ID_INTEL_GLK_I2C2,
PCI_DEVICE_ID_INTEL_GLK_I2C3,
PCI_DEVICE_ID_INTEL_GLK_I2C4,
PCI_DEVICE_ID_INTEL_GLK_I2C5,
PCI_DEVICE_ID_INTEL_GLK_I2C6,
PCI_DEVICE_ID_INTEL_GLK_I2C7,
PCI_DEVICE_ID_INTEL_CNP_H_I2C0,
PCI_DEVICE_ID_INTEL_CNP_H_I2C1,
PCI_DEVICE_ID_INTEL_CNP_H_I2C2,
PCI_DEVICE_ID_INTEL_CNP_H_I2C3,
PCI_DEVICE_ID_INTEL_ICP_I2C0,
PCI_DEVICE_ID_INTEL_ICP_I2C1,
PCI_DEVICE_ID_INTEL_ICP_I2C2,
PCI_DEVICE_ID_INTEL_ICP_I2C3,
PCI_DEVICE_ID_INTEL_ICP_I2C4,
PCI_DEVICE_ID_INTEL_ICP_I2C5,
PCI_DEVICE_ID_INTEL_CMP_I2C0,
PCI_DEVICE_ID_INTEL_CMP_I2C1,
PCI_DEVICE_ID_INTEL_CMP_I2C2,
PCI_DEVICE_ID_INTEL_CMP_I2C3,
PCI_DEVICE_ID_INTEL_CMP_I2C4,
PCI_DEVICE_ID_INTEL_CMP_I2C5,
0,
};
static const struct pci_driver pch_i2c __pci_driver = {
.ops = &i2c_dev_ops,
.vendor = PCI_VENDOR_ID_INTEL,
.devices = pci_device_ids,
};
#endif
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