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// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: 2006 ARM Ltd.
/*
* i2c-versatile.c
*
* written by Russell King, Deep Blue Solutions Ltd.
*/
#include <common.h>
#include <driver.h>
#include <i2c/i2c.h>
#include <i2c/i2c-algo-bit.h>
#include <init.h>
#include <malloc.h>
#include <io.h>
#include <linux/err.h>
#define I2C_CONTROL 0x00
#define I2C_CONTROLS 0x00
#define I2C_CONTROLC 0x04
#define SCL (1 << 0)
#define SDA (1 << 1)
struct i2c_versatile {
struct i2c_adapter adap;
struct i2c_algo_bit_data algo;
void __iomem *base;
};
static void i2c_versatile_setsda(void *data, int state)
{
struct i2c_versatile *i2c = data;
writel(SDA, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));
}
static void i2c_versatile_setscl(void *data, int state)
{
struct i2c_versatile *i2c = data;
writel(SCL, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));
}
static int i2c_versatile_getsda(void *data)
{
struct i2c_versatile *i2c = data;
return !!(readl(i2c->base + I2C_CONTROL) & SDA);
}
static int i2c_versatile_getscl(void *data)
{
struct i2c_versatile *i2c = data;
return !!(readl(i2c->base + I2C_CONTROL) & SCL);
}
static struct i2c_algo_bit_data i2c_versatile_algo = {
.setsda = i2c_versatile_setsda,
.setscl = i2c_versatile_setscl,
.getsda = i2c_versatile_getsda,
.getscl = i2c_versatile_getscl,
.udelay = 30,
.timeout_ms = 100,
};
static int i2c_versatile_probe(struct device_d *dev)
{
struct resource *iores;
struct i2c_versatile *i2c;
int ret;
i2c = kzalloc(sizeof(struct i2c_versatile), GFP_KERNEL);
if (!i2c) {
ret = -ENOMEM;
goto err_release;
}
iores = dev_request_mem_resource(dev, 0);
if (IS_ERR(iores)) {
ret = PTR_ERR(iores);
goto err_free;
}
i2c->base = IOMEM(iores->start);
writel(SCL | SDA, i2c->base + I2C_CONTROLS);
i2c->adap.algo_data = &i2c->algo;
i2c->adap.dev.parent = dev;
i2c->adap.dev.device_node = dev->device_node;
i2c->algo = i2c_versatile_algo;
i2c->algo.data = i2c;
i2c->adap.nr = dev->id;
ret = i2c_bit_add_numbered_bus(&i2c->adap);
if (ret >= 0) {
return 0;
}
err_free:
kfree(i2c);
err_release:
return ret;
}
static struct of_device_id i2c_versatile_match[] = {
{ .compatible = "arm,versatile-i2c", },
{},
};
static struct driver_d i2c_versatile_driver = {
.name = "versatile-i2c",
.probe = i2c_versatile_probe,
.of_compatible = DRV_OF_COMPAT(i2c_versatile_match),
};
device_platform_driver(i2c_versatile_driver);
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