// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Synopsys DesignWare I2C adapter driver.
*
* Based on the TI DAVINCI I2C adapter driver.
*
* Copyright (C) 2006 Texas Instruments.
* Copyright (C) 2007 MontaVista Software Inc.
* Copyright (C) 2009 Provigent Ltd.
*/
#include <linux/clk-provider.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/units.h>
#include "i2c-designware-core.h"
static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
{
return clk_get_rate(dev->clk) / KILO;
}
#ifdef CONFIG_OF
#define BT1_I2C_CTL 0x100
#define BT1_I2C_CTL_ADDR_MASK GENMASK(7, 0)
#define BT1_I2C_CTL_WR BIT(8)
#define BT1_I2C_CTL_GO BIT(31)
#define BT1_I2C_DI 0x104
#define BT1_I2C_DO 0x108
static int bt1_i2c_read(void *context, unsigned int reg, unsigned int *val)
{
struct dw_i2c_dev *dev = context;
int ret;
/*
* Note these methods shouldn't ever fail because the system controller
* registers are memory mapped. We check the return value just in case.
*/
ret = regmap_write(dev->sysmap, BT1_I2C_CTL,
BT1_I2C_CTL_GO | (reg & BT1_I2C_CTL_ADDR_MASK));
if (ret)
return ret;
return regmap_read(dev->sysmap, BT1_I2C_DO, val);
}
static int bt1_i2c_write(void *context, unsigned int reg, unsigned int val)
{
struct dw_i2c_dev *dev = context;
int ret;
ret = regmap_write(dev->sysmap, BT1_I2C_DI, val);
if (ret)
return ret;
return regmap_write(dev->sysmap, BT1_I2C_CTL,
BT1_I2C_CTL_GO | BT1_I2C_CTL_WR | (reg & BT1_I2C_CTL_ADDR_MASK));
}
static const struct regmap_config bt1_i2c_cfg = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.fast_io = true,
.reg_read = bt1_i2c_read,
.reg_write = bt1_i2c_write,
.max_register = DW_IC_COMP_TYPE,
};
static int bt1_i2c_request_regs(struct dw_i2c_dev *dev)
{
dev->sysmap = syscon_node_to_regmap(dev->dev->of_node->parent);
if (IS_ERR(dev->sysmap))
return PTR_ERR(dev->sysmap);
dev->map = devm_regmap_init(dev->dev, NULL, dev, &bt1_i2c_cfg);
return PTR_ERR_OR_ZERO(dev->map);
}
#else
static int bt1_i2c_request_regs(struct dw_i2c_dev *dev)
{
return -ENODEV;
}
#endif
static int txgbe_i2c_request_regs(struct dw_i2c_dev *dev)
{
dev->map = dev_get_regmap(dev->dev->parent, NULL);
if (!dev->map)
return -ENODEV;
return 0;
}
static void dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *dev)
{
pm_runtime_disable(dev->dev);
if (dev->shared_with_punit)
pm_runtime_put_noidle(dev->dev);
}
static int dw_i2c_plat_request_regs(struct dw_i2c_dev *dev)
{
struct platform_device *pdev = to_platform_device(dev->dev);
int ret;
switch (dev->flags & MODEL_MASK) {
case MODEL_BAIKAL_BT1:
ret = bt1_i2c_request_regs(dev);
break;
case MODEL_WANGXUN_SP:
ret = txgbe_i2c_request_regs(dev);
break;
default:
dev->base = devm_platform_ioremap_resource(pdev, 0);
ret = PTR_ERR_OR_ZERO(dev->base);
break;
}
return ret;
}
static const struct dmi_system_id dw_i2c_hwmon_class_dmi[] = {
{
.ident = "Qtechnology QT5222",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Qtechnology"),
DMI_MATCH(DMI_PRODUCT_NAME, "QT5222"),
},
},
{ } /* terminate list */
};
static const struct i2c_dw_semaphore_callbacks i2c_dw_semaphore_cb_table[] = {
#ifdef CONFIG_I2C_DESIGNWARE_BAYTRAIL
{
.probe = i2c_dw_baytrail_probe_lock_support,
},
#endif
#ifdef CONFIG_I2C_DESIGNWARE_AMDPSP
{
.probe = i2c_dw_amdpsp_probe_lock_support,
},
#endif
{}
};
static int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev)
{
const struct i2c_dw_semaphore_callbacks *ptr;
int i = 0;
int ret;
dev->semaphore_idx = -1;
for (ptr = i2c_dw_semaphore_cb_table; ptr->probe; ptr++) {
ret = ptr->probe(dev);
if (ret) {
/*
* If there is no semaphore device attached to this
* controller, we shouldn't abort general i2c_controller
* probe.
*/
if (ret != -ENODEV)
return ret;
i++;
continue;
}
dev->semaphore_idx = i;
break;
}
return 0;
}
static void i2c_dw_remove_lock_support(struct dw_i2c_dev *dev)
{
if (dev->semaphore_idx < 0)
return;
if (i2c_dw_semaphore_cb_table[dev->semaphore_idx].remove)
i2c_dw_semaphore_cb_table[dev->semaphore_idx].remove(dev);
}
static int dw_i2c_plat_probe(struct platform_device *pdev)
{
struct i2c_adapter *adap;
struct dw_i2c_dev *dev;
int irq, ret;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev->flags = (uintptr_t)device_get_match_data(&pdev->dev);
if (device_property_present(&pdev->dev, "wx,i2c-snps-model"))
dev->flags = MODEL_WANGXUN_SP | ACCESS_POLLING;
dev->dev = &pdev->dev;
dev->irq = irq;
platform_set_drvdata(pdev, dev);
ret = dw_i2c_plat_request_regs(dev);
if (ret)
return ret;
dev->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
if (IS_ERR(dev->rst))
return PTR_ERR(dev->rst);
reset_control_deassert(dev->rst);
ret = i2c_dw_fw_parse_and_configure(dev);
if (ret)
goto exit_reset;
ret = i2c_dw_probe_lock_support(dev);
if (ret)
goto exit_reset;
i2c_dw_configure(dev);
/* Optional interface clock */
dev->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
if (IS_ERR(dev->pclk)) {
ret = PTR_ERR(dev->pclk);
goto exit_reset;
}
dev->clk = devm_clk_get_optional(&pdev->dev, NULL);
if (IS_ERR(dev->clk)) {
ret = PTR_ERR(dev->clk);
goto exit_reset;
}
ret = i2c_dw_prepare_clk(dev, true);
if (ret)
goto exit_reset;
if (dev->clk) {
struct i2c_timings *t = &dev->timings;
u64 clk_khz;
dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
clk_khz = dev->get_clk_rate_khz(dev);
if (!dev->sda_hold_time && t->sda_hold_ns)
dev->sda_hold_time =
DIV_S64_ROUND_CLOSEST(clk_khz * t->sda_hold_ns, MICRO);
}
adap = &dev->adapter;
adap->owner = THIS_MODULE;
adap->class = dmi_check_system(dw_i2c_hwmon_class_dmi) ?
I2C_CLASS_HWMON : I2C_CLASS_DEPRECATED;
adap->nr = -1;
if (dev->flags & ACCESS_NO_IRQ_SUSPEND) {
dev_pm_set_driver_flags(&pdev->dev,
DPM_FLAG_SMART_PREPARE);
} else {
dev_pm_set_driver_flags(&pdev->dev,
DPM_FLAG_SMART_PREPARE |
DPM_FLAG_SMART_SUSPEND);
}
device_enable_async_suspend(&pdev->dev);
/* The code below assumes runtime PM to be disabled. */
WARN_ON(pm_runtime_enabled(&pdev->dev));
pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
if (dev->shared_with_punit)
pm_runtime_get_noresume(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = i2c_dw_probe(dev);
if (ret)
goto exit_probe;
return ret;
exit_probe:
dw_i2c_plat_pm_cleanup(dev);
exit_reset:
reset_control_assert(dev->rst);
return ret;
}
static void dw_i2c_plat_remove(struct platform_device *pdev)
{
struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
pm_runtime_get_sync(&pdev->dev);
i2c_del_adapter(&dev->adapter);
i2c_dw_disable(dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_put_sync(&pdev->dev);
dw_i2c_plat_pm_cleanup(dev);
i2c_dw_remove_lock_support(dev);
reset_control_assert(dev->rst);
}
static const struct of_device_id dw_i2c_of_match[] = {
{ .compatible = "snps,designware-i2c", },
{ .compatible = "mscc,ocelot-i2c", .data = (void *)MODEL_MSCC_OCELOT },
{ .compatible = "baikal,bt1-sys-i2c", .data = (void *)MODEL_BAIKAL_BT1 },
{}
};
MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
static const struct acpi_device_id dw_i2c_acpi_match[] = {
{ "80860F41", ACCESS_NO_IRQ_SUSPEND },
{ "808622C1", ACCESS_NO_IRQ_SUSPEND },
{ "AMD0010", ACCESS_INTR_MASK },
{ "AMDI0010", ACCESS_INTR_MASK },
{ "AMDI0019", ACCESS_INTR_MASK | ARBITRATION_SEMAPHORE },
{ "AMDI0510", 0 },
{ "APMC0D0F", 0 },
{ "HISI02A1", 0 },
{ "HISI02A2", 0 },
{ "HISI02A3", 0 },
{ "HYGO0010", ACCESS_INTR_MASK },
{ "INT33C2", 0 },
{ "INT33C3", 0 },
{ "INT3432", 0 },
{ "INT3433", 0 },
{ "INTC10EF", 0 },
{}
};
MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
static const struct platform_device_id dw_i2c_platform_ids[] = {
{ "i2c_designware" },
{}
};
MODULE_DEVICE_TABLE(platform, dw_i2c_platform_ids);
static struct platform_driver dw_i2c_driver = {
.probe = dw_i2c_plat_probe,
.remove_new = dw_i2c_plat_remove,
.driver = {
.name = "i2c_designware",
.of_match_table = dw_i2c_of_match,
.acpi_match_table = dw_i2c_acpi_match,
.pm = pm_ptr(&i2c_dw_dev_pm_ops),
},
.id_table = dw_i2c_platform_ids,
};
static int __init dw_i2c_init_driver(void)
{
return platform_driver_register(&dw_i2c_driver);
}
subsys_initcall(dw_i2c_init_driver);
static void __exit dw_i2c_exit_driver(void)
{
platform_driver_unregister(&dw_i2c_driver);
}
module_exit(dw_i2c_exit_driver);
MODULE_AUTHOR("Baruch Siach <[email protected]>");
MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(I2C_DW);
MODULE_IMPORT_NS(I2C_DW_COMMON);
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