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drm/hisilicon: Support i2c driver algorithms for bit-shift adapters

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Adding driver implementation to support i2c driver algorithms for
bit-shift adapters, so hibmc will using the interface provided by
drm to read edid.

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/1600778670-60370-2-git-send-email-tiantao6@hisilicon.com
This commit is contained in:
Tian Tao 2020-09-22 20:44:29 +08:00
parent 880ee3b761
commit 4eb4d99dfe
3 changed files with 124 additions and 2 deletions
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2
drivers/gpu/drm/hisilicon/hibmc/Makefile
View file

@ -1,4 +1,4 @@
# SPDX-License-Identifier: GPL-2.0-only
hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_vdac.o hibmc_ttm.o
hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_vdac.o hibmc_ttm.o hibmc_drm_i2c.o
obj-$(CONFIG_DRM_HISI_HIBMC) += hibmc-drm.o

25
drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
View file

@ -14,11 +14,23 @@
#ifndef HIBMC_DRM_DRV_H
#define HIBMC_DRM_DRV_H
#include <linux/gpio/consumer.h>
#include <linux/i2c-algo-bit.h>
#include <linux/i2c.h>
#include <drm/drm_edid.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_framebuffer.h>
struct drm_device;
struct hibmc_connector {
struct drm_connector base;
struct i2c_adapter adapter;
struct i2c_algo_bit_data bit_data;
};
struct hibmc_drm_private {
/* hw */
void __iomem *mmio;
@ -31,10 +43,20 @@ struct hibmc_drm_private {
struct drm_plane primary_plane;
struct drm_crtc crtc;
struct drm_encoder encoder;
struct drm_connector connector;
struct hibmc_connector connector;
bool mode_config_initialized;
};
static inline struct hibmc_connector *to_hibmc_connector(struct drm_connector *connector)
{
return container_of(connector, struct hibmc_connector, base);
}
static inline struct hibmc_drm_private *to_hibmc_drm_private(struct drm_device *dev)
{
return dev->dev_private;
}
void hibmc_set_power_mode(struct hibmc_drm_private *priv,
unsigned int power_mode);
void hibmc_set_current_gate(struct hibmc_drm_private *priv,
@ -47,6 +69,7 @@ int hibmc_mm_init(struct hibmc_drm_private *hibmc);
void hibmc_mm_fini(struct hibmc_drm_private *hibmc);
int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
struct drm_mode_create_dumb *args);
int hibmc_ddc_create(struct drm_device *drm_dev, struct hibmc_connector *connector);
extern const struct drm_mode_config_funcs hibmc_mode_funcs;

99
drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c Normal file
View file

@ -0,0 +1,99 @@
// 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_connector *hibmc_connector = data;
struct hibmc_drm_private *priv = to_hibmc_drm_private(hibmc_connector->base.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_connector *hibmc_connector = data;
struct hibmc_drm_private *priv = to_hibmc_drm_private(hibmc_connector->base.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_connector *connector)
{
connector->adapter.owner = THIS_MODULE;
connector->adapter.class = I2C_CLASS_DDC;
snprintf(connector->adapter.name, I2C_NAME_SIZE, "HIS i2c bit bus");
connector->adapter.dev.parent = &drm_dev->pdev->dev;
i2c_set_adapdata(&connector->adapter, connector);
connector->adapter.algo_data = &connector->bit_data;
connector->bit_data.udelay = 20;
connector->bit_data.timeout = usecs_to_jiffies(2000);
connector->bit_data.data = connector;
connector->bit_data.setsda = hibmc_ddc_setsda;
connector->bit_data.setscl = hibmc_ddc_setscl;
connector->bit_data.getsda = hibmc_ddc_getsda;
connector->bit_data.getscl = hibmc_ddc_getscl;
return i2c_bit_add_bus(&connector->adapter);
}