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// SPDX-License-Identifier: GPL-2.0-or-later
/* Hisilicon Hibmc SoC drm driver
*
* Based on the bochs drm driver.
*
* Copyright (c) 2016 Huawei Limited.
*
* Author:
* Tian Tao <tiantao6@hisilicon.com>
*/
#include <linux/delay.h>
#include <linux/pci.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_probe_helper.h>
#include "hibmc_drm_drv.h"
#define GPIO_DATA 0x0802A0
#define GPIO_DATA_DIRECTION 0x0802A4
#define I2C_SCL_MASK BIT(0)
#define I2C_SDA_MASK BIT(1)
static void hibmc_set_i2c_signal(void *data, u32 mask, int value)
{
struct hibmc_vdac *vdac = data;
struct hibmc_drm_private *priv = to_hibmc_drm_private(vdac->connector.dev);
u32 tmp_dir = readl(priv->mmio + GPIO_DATA_DIRECTION);
if (value) {
tmp_dir &= ~mask;
writel(tmp_dir, priv->mmio + GPIO_DATA_DIRECTION);
} else {
u32 tmp_data = readl(priv->mmio + GPIO_DATA);
tmp_data &= ~mask;
writel(tmp_data, priv->mmio + GPIO_DATA);
tmp_dir |= mask;
writel(tmp_dir, priv->mmio + GPIO_DATA_DIRECTION);
}
}
static int hibmc_get_i2c_signal(void *data, u32 mask)
{
struct hibmc_vdac *vdac = data;
struct hibmc_drm_private *priv = to_hibmc_drm_private(vdac->connector.dev);
u32 tmp_dir = readl(priv->mmio + GPIO_DATA_DIRECTION);
if ((tmp_dir & mask) != mask) {
tmp_dir &= ~mask;
writel(tmp_dir, priv->mmio + GPIO_DATA_DIRECTION);
}
return (readl(priv->mmio + GPIO_DATA) & mask) ? 1 : 0;
}
static void hibmc_ddc_setsda(void *data, int state)
{
hibmc_set_i2c_signal(data, I2C_SDA_MASK, state);
}
static void hibmc_ddc_setscl(void *data, int state)
{
hibmc_set_i2c_signal(data, I2C_SCL_MASK, state);
}
static int hibmc_ddc_getsda(void *data)
{
return hibmc_get_i2c_signal(data, I2C_SDA_MASK);
}
static int hibmc_ddc_getscl(void *data)
{
return hibmc_get_i2c_signal(data, I2C_SCL_MASK);
}
int hibmc_ddc_create(struct drm_device *drm_dev, struct hibmc_vdac *vdac)
{
vdac->adapter.owner = THIS_MODULE;
snprintf(vdac->adapter.name, I2C_NAME_SIZE, "HIS i2c bit bus");
vdac->adapter.dev.parent = drm_dev->dev;
i2c_set_adapdata(&vdac->adapter, vdac);
vdac->adapter.algo_data = &vdac->bit_data;
vdac->bit_data.udelay = 20;
vdac->bit_data.timeout = usecs_to_jiffies(2000);
vdac->bit_data.data = vdac;
vdac->bit_data.setsda = hibmc_ddc_setsda;
vdac->bit_data.setscl = hibmc_ddc_setscl;
vdac->bit_data.getsda = hibmc_ddc_getsda;
vdac->bit_data.getscl = hibmc_ddc_getscl;
return i2c_bit_add_bus(&vdac->adapter);
}
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