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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2009
* Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
* Copyright 2019 Google Inc
*/
#include <common.h>
#include <dm.h>
#include <log.h>
#include <spl.h>
#include <acpi/acpigen.h>
#include <acpi/acpi_device.h>
#include <asm/lpss.h>
#include <dm/acpi.h>
#include <dm/device-internal.h>
#include <dm/uclass-internal.h>
#include "designware_i2c.h"
enum {
VANILLA = 0, /* standard I2C with no tweaks */
INTEL_APL, /* Apollo Lake I2C */
};
/* BayTrail HCNT/LCNT/SDA hold time */
static struct dw_scl_sda_cfg byt_config = {
.ss_hcnt = 0x200,
.fs_hcnt = 0x55,
.ss_lcnt = 0x200,
.fs_lcnt = 0x99,
.sda_hold = 0x6,
};
/* Have a weak function for now - possibly should be a new uclass */
__weak void lpss_reset_release(void *regs);
static int designware_i2c_pci_ofdata_to_platdata(struct udevice *dev)
{
struct dw_i2c *priv = dev_get_priv(dev);
if (spl_phase() < PHASE_SPL) {
u32 base;
int ret;
ret = dev_read_u32(dev, "early-regs", &base);
if (ret)
return log_msg_ret("early-regs", ret);
/* Set i2c base address */
dm_pci_write_config32(dev, PCI_BASE_ADDRESS_0, base);
/* Enable memory access and bus master */
dm_pci_write_config32(dev, PCI_COMMAND, PCI_COMMAND_MEMORY |
PCI_COMMAND_MASTER);
}
if (spl_phase() < PHASE_BOARD_F) {
/* Handle early, fixed mapping into a different address space */
priv->regs = (struct i2c_regs *)dm_pci_read_bar32(dev, 0);
} else {
priv->regs = (struct i2c_regs *)
dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0, PCI_REGION_MEM);
}
if (!priv->regs)
return -EINVAL;
/* Save base address from PCI BAR */
if (IS_ENABLED(CONFIG_INTEL_BAYTRAIL))
/* Use BayTrail specific timing values */
priv->scl_sda_cfg = &byt_config;
if (dev_get_driver_data(dev) == INTEL_APL)
priv->has_spk_cnt = true;
return designware_i2c_ofdata_to_platdata(dev);
}
static int designware_i2c_pci_probe(struct udevice *dev)
{
struct dw_i2c *priv = dev_get_priv(dev);
if (dev_get_driver_data(dev) == INTEL_APL) {
/* Ensure controller is in D0 state */
lpss_set_power_state(dev, STATE_D0);
lpss_reset_release(priv->regs);
}
return designware_i2c_probe(dev);
}
static int designware_i2c_pci_bind(struct udevice *dev)
{
char name[20];
if (dev_of_valid(dev))
return 0;
/*
* Create a unique device name for PCI type devices
* ToDo:
* Setting req_seq in the driver is probably not recommended.
* But without a DT alias the number is not configured. And
* using this driver is impossible for PCIe I2C devices.
* This can be removed, once a better (correct) way for this
* is found and implemented.
*
* TODO(sjg@chromium.org): Perhaps if uclasses had platdata this would
* be possible. We cannot use static data in drivers since they may be
* used in SPL or before relocation.
*/
dev->req_seq = uclass_find_next_free_req_seq(UCLASS_I2C);
sprintf(name, "i2c_designware#%u", dev->req_seq);
device_set_name(dev, name);
return 0;
}
/*
* Write ACPI object to describe speed configuration.
*
* ACPI Object: Name ("xxxx", Package () { scl_lcnt, scl_hcnt, sda_hold }
*
* SSCN: I2C_SPEED_STANDARD
* FMCN: I2C_SPEED_FAST
* FPCN: I2C_SPEED_FAST_PLUS
* HSCN: I2C_SPEED_HIGH
*/
static void dw_i2c_acpi_write_speed_config(struct acpi_ctx *ctx,
struct dw_i2c_speed_config *config)
{
switch (config->speed_mode) {
case IC_SPEED_MODE_HIGH:
acpigen_write_name(ctx, "HSCN");
break;
case IC_SPEED_MODE_FAST_PLUS:
acpigen_write_name(ctx, "FPCN");
break;
case IC_SPEED_MODE_FAST:
acpigen_write_name(ctx, "FMCN");
break;
case IC_SPEED_MODE_STANDARD:
default:
acpigen_write_name(ctx, "SSCN");
}
/* Package () { scl_lcnt, scl_hcnt, sda_hold } */
acpigen_write_package(ctx, 3);
acpigen_write_word(ctx, config->scl_hcnt);
acpigen_write_word(ctx, config->scl_lcnt);
acpigen_write_dword(ctx, config->sda_hold);
acpigen_pop_len(ctx);
}
/*
* Generate I2C timing information into the SSDT for the OS driver to consume,
* optionally applying override values provided by the caller.
*/
static int dw_i2c_acpi_fill_ssdt(const struct udevice *dev,
struct acpi_ctx *ctx)
{
struct dw_i2c_speed_config config;
char path[ACPI_PATH_MAX];
u32 speeds[4];
uint speed;
int size;
int ret;
/* If no device-tree node, ignore this since we assume it isn't used */
if (!dev_of_valid(dev))
return 0;
ret = acpi_device_path(dev, path, sizeof(path));
if (ret)
return log_msg_ret("path", ret);
size = dev_read_size(dev, "i2c,speeds");
if (size < 0)
return log_msg_ret("i2c,speeds", -EINVAL);
size /= sizeof(u32);
if (size > ARRAY_SIZE(speeds))
return log_msg_ret("array", -E2BIG);
ret = dev_read_u32_array(dev, "i2c,speeds", speeds, size);
if (ret)
return log_msg_ret("read", -E2BIG);
speed = dev_read_u32_default(dev, "clock-frequency", 100000);
acpigen_write_scope(ctx, path);
ret = dw_i2c_gen_speed_config(dev, speed, &config);
if (ret)
return log_msg_ret("config", ret);
dw_i2c_acpi_write_speed_config(ctx, &config);
acpigen_pop_len(ctx);
return 0;
}
struct acpi_ops dw_i2c_acpi_ops = {
.fill_ssdt = dw_i2c_acpi_fill_ssdt,
};
static const struct udevice_id designware_i2c_pci_ids[] = {
{ .compatible = "snps,designware-i2c-pci" },
{ .compatible = "intel,apl-i2c", .data = INTEL_APL },
{ }
};
U_BOOT_DRIVER(i2c_designware_pci) = {
.name = "i2c_designware_pci",
.id = UCLASS_I2C,
.of_match = designware_i2c_pci_ids,
.bind = designware_i2c_pci_bind,
.ofdata_to_platdata = designware_i2c_pci_ofdata_to_platdata,
.probe = designware_i2c_pci_probe,
.priv_auto_alloc_size = sizeof(struct dw_i2c),
.remove = designware_i2c_remove,
.flags = DM_FLAG_OS_PREPARE,
.ops = &designware_i2c_ops,
ACPI_OPS_PTR(&dw_i2c_acpi_ops)
};
static struct pci_device_id designware_pci_supported[] = {
/* Intel BayTrail has 7 I2C controller located on the PCI bus */
{ PCI_VDEVICE(INTEL, 0x0f41) },
{ PCI_VDEVICE(INTEL, 0x0f42) },
{ PCI_VDEVICE(INTEL, 0x0f43) },
{ PCI_VDEVICE(INTEL, 0x0f44) },
{ PCI_VDEVICE(INTEL, 0x0f45) },
{ PCI_VDEVICE(INTEL, 0x0f46) },
{ PCI_VDEVICE(INTEL, 0x0f47) },
{ PCI_VDEVICE(INTEL, 0x5aac), .driver_data = INTEL_APL },
{ PCI_VDEVICE(INTEL, 0x5aae), .driver_data = INTEL_APL },
{ PCI_VDEVICE(INTEL, 0x5ab0), .driver_data = INTEL_APL },
{ PCI_VDEVICE(INTEL, 0x5ab2), .driver_data = INTEL_APL },
{ PCI_VDEVICE(INTEL, 0x5ab4), .driver_data = INTEL_APL },
{ PCI_VDEVICE(INTEL, 0x5ab6), .driver_data = INTEL_APL },
{},
};
U_BOOT_PCI_DEVICE(i2c_designware_pci, designware_pci_supported);
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