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    Subject[PATCH drm/hisilicon 1/3] drm/hisilicon: Support i2c driver algorithms for bit-shift adapters
    Date
    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>
    ---
    drivers/gpu/drm/hisilicon/hibmc/Makefile | 2 +-
    drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h | 21 +++++-
    drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c | 98 +++++++++++++++++++++++++
    3 files changed, 119 insertions(+), 2 deletions(-)
    create mode 100644 drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c

    diff --git a/drivers/gpu/drm/hisilicon/hibmc/Makefile b/drivers/gpu/drm/hisilicon/hibmc/Makefile
    index f991327..684ef79 100644
    --- a/drivers/gpu/drm/hisilicon/hibmc/Makefile
    +++ b/drivers/gpu/drm/hisilicon/hibmc/Makefile
    @@ -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
    diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
    index 197485e..1b2edb3 100644
    --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
    +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
    @@ -14,11 +14,24 @@
    #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 drm_device *dev;
    +
    + struct i2c_adapter adapter;
    + struct i2c_algo_bit_data bit_data;
    +};
    +
    struct hibmc_drm_private {
    /* hw */
    void __iomem *mmio;
    @@ -31,10 +44,15 @@ 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);
    +}
    +
    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 +65,7 @@ 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 hibmc_connector *connector);

    extern const struct drm_mode_config_funcs hibmc_mode_funcs;

    diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c
    new file mode 100644
    index 0000000..0506846
    --- /dev/null
    +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c
    @@ -0,0 +1,98 @@
    +// 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 GPIO_SCL_MASK 0x1
    +#define GPIO_SDA_MASK 0x2
    +
    +static void hibmc_set_i2c_signal(void *data, u32 mask, int value)
    +{
    + struct hibmc_connector *hibmc_connector = data;
    + struct hibmc_drm_private *priv = hibmc_connector->dev->dev_private;
    + 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 = hibmc_connector->dev->dev_private;
    + 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, GPIO_SDA_MASK, state);
    +}
    +
    +static void hibmc_ddc_setscl(void *data, int state)
    +{
    + hibmc_set_i2c_signal(data, GPIO_SCL_MASK, state);
    +}
    +
    +static int hibmc_ddc_getsda(void *data)
    +{
    + return hibmc_get_i2c_signal(data, GPIO_SDA_MASK);
    +}
    +
    +static int hibmc_ddc_getscl(void *data)
    +{
    + return hibmc_get_i2c_signal(data, GPIO_SCL_MASK);
    +}
    +
    +int hibmc_ddc_create(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 = &connector->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);
    +}
    --
    2.7.4
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