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/*
* Hisilicon Synopsys DesignWare I2C adapter driver (master only).
*
* Copyright (c) 2012-2013 Linaro Ltd.
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/of_i2c.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/pinctrl/consumer.h>
#include <linux/of_address.h>
#include "i2c-designware-core.h"
static void __iomem *pctrl;
struct hs_i2c_priv_data {
u32 delay_off;
u32 delay_bit;
};
static struct i2c_algorithm hs_i2c_dw_algo = {
.master_xfer = i2c_dw_xfer,
.functionality = i2c_dw_func,
};
static u32 hs_i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
{
return clk_get_rate(dev->clk)/1000;
}
static int hs_dw_i2c_probe(struct platform_device *pdev)
{
struct dw_i2c_dev *d;
struct i2c_adapter *adap;
struct resource *iores;
struct pinctrl *pinctrl;
struct device_node *node;
u32 data[2];
struct hs_i2c_priv_data *priv;
int r;
d = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
if (!d)
return -ENOMEM;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(&pdev->dev, "mem alloc failed for private data\n");
return -ENOMEM;
}
d->priv = priv;
/* NOTE: driver uses the static register mapping */
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!iores)
return -EINVAL;
d->base = devm_request_and_ioremap(&pdev->dev, iores);
if (!d->base)
return -EADDRNOTAVAIL;
if (!pctrl) {
node = of_find_compatible_node(NULL, NULL,
"hisilicon,pctrl");
if (node)
pctrl = of_iomap(node, 0);
}
of_property_read_u32_array(pdev->dev.of_node, "delay-reg", &data[0], 2);
priv->delay_off = data[0];
priv->delay_bit = data[1];
if (pctrl)
writel(BIT((priv->delay_bit) << 16) | BIT(priv->delay_bit),
pctrl + priv->delay_off);
d->irq = platform_get_irq(pdev, 0);
if (d->irq < 0) {
dev_err(&pdev->dev, "no irq resource?\n");
return d->irq; /* -ENXIO */
}
r = devm_request_irq(&pdev->dev, d->irq,
i2c_dw_isr, IRQF_DISABLED, pdev->name, d);
if (r) {
dev_err(&pdev->dev, "failure requesting irq %i\n", d->irq);
return -EINVAL;
}
pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
if (IS_ERR(pinctrl))
dev_warn(&pdev->dev,
"pins are not configured from the driver\n");
d->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(d->clk))
return -ENODEV;
d->get_clk_rate_khz = hs_i2c_dw_get_clk_rate_khz;
clk_prepare_enable(d->clk);
init_completion(&d->cmd_complete);
mutex_init(&d->lock);
d->dev = get_device(&pdev->dev);
d->functionality =
I2C_FUNC_I2C |
I2C_FUNC_10BIT_ADDR |
I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_I2C_BLOCK;
d->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
d->accessor_flags = ACCESS_32BIT;
d->tx_fifo_depth = 16;
d->rx_fifo_depth = 16;
r = i2c_dw_init(d);
if (r)
goto err;
i2c_dw_disable_int(d);
adap = &d->adapter;
i2c_set_adapdata(adap, d);
adap->owner = THIS_MODULE;
adap->class = I2C_CLASS_HWMON;
strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
sizeof(adap->name));
adap->algo = &hs_i2c_dw_algo;
adap->dev.parent = &pdev->dev;
adap->dev.of_node = pdev->dev.of_node;
adap->nr = pdev->id;
r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(&pdev->dev, "failure adding adapter\n");
goto err;
}
of_i2c_register_devices(adap);
platform_set_drvdata(pdev, d);
return 0;
err:
clk_disable_unprepare(d->clk);
put_device(&pdev->dev);
return r;
}
static int hs_dw_i2c_remove(struct platform_device *pdev)
{
struct dw_i2c_dev *d = platform_get_drvdata(pdev);
struct hs_i2c_priv_data *priv = d->priv;
if (pctrl)
writel(BIT((priv->delay_bit) << 16), pctrl + priv->delay_off);
platform_set_drvdata(pdev, NULL);
i2c_del_adapter(&d->adapter);
put_device(&pdev->dev);
clk_disable_unprepare(d->clk);
i2c_dw_disable(d);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id hs_dw_i2c_of_match[] = {
{ .compatible = "hisilicon,designware-i2c", },
{},
};
MODULE_DEVICE_TABLE(of, hs_dw_i2c_of_match);
#endif
#ifdef CONFIG_PM
static int hs_dw_i2c_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
clk_disable_unprepare(i_dev->clk);
return 0;
}
static int hs_dw_i2c_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
clk_prepare_enable(i_dev->clk);
i2c_dw_init(i_dev);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(hs_dw_i2c_dev_pm_ops, hs_dw_i2c_suspend, hs_dw_i2c_resume);
static struct platform_driver hs_dw_i2c_driver = {
.probe = hs_dw_i2c_probe,
.remove = hs_dw_i2c_remove,
.driver = {
.name = "i2c_designware-hs",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(hs_dw_i2c_of_match),
.pm = &hs_dw_i2c_dev_pm_ops,
},
};
module_platform_driver(hs_dw_i2c_driver);
MODULE_DESCRIPTION("HS Synopsys DesignWare I2C bus adapter");
MODULE_ALIAS("platform:i2c_designware-hs");
MODULE_LICENSE("GPL");
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