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

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

diff --git a/drivers/gpu/drm/hisilicon/hibmc/Makefile b/drivers/gpu/drm/hisilicon/hibmc/Makefile
index f991327..684ef79 100644 (file)
--- 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..87d2aad 100644 (file)
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
@@ -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;
 

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 (file)
index 0000000..86d7120
--- /dev/null
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_i2c.c
@@ -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);
+}