1 files changed, 298 insertions, 0 deletions

diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c
new file mode 100644
index 000000000000..796c3c1c170a
--- /dev/null
+++ b/drivers/gpu/drm/imx/parallel-display.c
@@ -0,0 +1,298 @@
+/*
+ * i.MX drm driver - parallel display implementation
+ *
+ * Copyright (C) 2012 Sascha Hauer, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/component.h>
+#include <linux/module.h>
+#include <drm/drmP.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_panel.h>
+#include <linux/videodev2.h>
+#include <video/of_display_timing.h>
+
+#include "imx-drm.h"
+
+#define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
+#define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
+
+struct imx_parallel_display {
+        struct drm_connector connector;
+        struct drm_encoder encoder;
+        struct device *dev;
+        void *edid;
+        int edid_len;
+        u32 interface_pix_fmt;
+        int mode_valid;
+        struct drm_display_mode mode;
+        struct drm_panel *panel;
+};
+
+static enum drm_connector_status imx_pd_connector_detect(
+                struct drm_connector *connector, bool force)
+{
+        return connector_status_connected;
+}
+
+static int imx_pd_connector_get_modes(struct drm_connector *connector)
+{
+        struct imx_parallel_display *imxpd = con_to_imxpd(connector);
+        struct device_node *np = imxpd->dev->of_node;
+        int num_modes = 0;
+
+        if (imxpd->panel && imxpd->panel->funcs &&
+            imxpd->panel->funcs->get_modes) {
+                num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
+                if (num_modes > 0)
+                        return num_modes;
+        }
+
+        if (imxpd->edid) {
+                drm_mode_connector_update_edid_property(connector, imxpd->edid);
+                num_modes = drm_add_edid_modes(connector, imxpd->edid);
+        }
+
+        if (imxpd->mode_valid) {
+                struct drm_display_mode *mode = drm_mode_create(connector->dev);
+
+                if (!mode)
+                        return -EINVAL;
+                drm_mode_copy(mode, &imxpd->mode);
+                mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+                drm_mode_probed_add(connector, mode);
+                num_modes++;
+        }
+
+        if (np) {
+                struct drm_display_mode *mode = drm_mode_create(connector->dev);
+
+                if (!mode)
+                        return -EINVAL;
+                of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
+                drm_mode_copy(mode, &imxpd->mode);
+                mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+                drm_mode_probed_add(connector, mode);
+                num_modes++;
+        }
+
+        return num_modes;
+}
+
+static struct drm_encoder *imx_pd_connector_best_encoder(
+                struct drm_connector *connector)
+{
+        struct imx_parallel_display *imxpd = con_to_imxpd(connector);
+
+        return &imxpd->encoder;
+}
+
+static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
+{
+        struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
+
+        if (mode != DRM_MODE_DPMS_ON)
+                drm_panel_disable(imxpd->panel);
+        else
+                drm_panel_enable(imxpd->panel);
+}
+
+static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
+                           const struct drm_display_mode *mode,
+                           struct drm_display_mode *adjusted_mode)
+{
+        return true;
+}
+
+static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
+{
+        struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
+
+        imx_drm_panel_format(encoder, imxpd->interface_pix_fmt);
+}
+
+static void imx_pd_encoder_commit(struct drm_encoder *encoder)
+{
+        struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
+
+        drm_panel_prepare(imxpd->panel);
+        drm_panel_enable(imxpd->panel);
+}
+
+static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
+                         struct drm_display_mode *mode,
+                         struct drm_display_mode *adjusted_mode)
+{
+}
+
+static void imx_pd_encoder_disable(struct drm_encoder *encoder)
+{
+        struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
+
+        drm_panel_disable(imxpd->panel);
+        drm_panel_unprepare(imxpd->panel);
+}
+
+static struct drm_connector_funcs imx_pd_connector_funcs = {
+        .dpms = drm_helper_connector_dpms,
+        .fill_modes = drm_helper_probe_single_connector_modes,
+        .detect = imx_pd_connector_detect,
+        .destroy = imx_drm_connector_destroy,
+};
+
+static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
+        .get_modes = imx_pd_connector_get_modes,
+        .best_encoder = imx_pd_connector_best_encoder,
+};
+
+static struct drm_encoder_funcs imx_pd_encoder_funcs = {
+        .destroy = imx_drm_encoder_destroy,
+};
+
+static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
+        .dpms = imx_pd_encoder_dpms,
+        .mode_fixup = imx_pd_encoder_mode_fixup,
+        .prepare = imx_pd_encoder_prepare,
+        .commit = imx_pd_encoder_commit,
+        .mode_set = imx_pd_encoder_mode_set,
+        .disable = imx_pd_encoder_disable,
+};
+
+static int imx_pd_register(struct drm_device *drm,
+        struct imx_parallel_display *imxpd)
+{
+        int ret;
+
+        ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
+                                       imxpd->dev->of_node);
+        if (ret)
+                return ret;
+
+        /* set the connector's dpms to OFF so that
+         * drm_helper_connector_dpms() won't return
+         * immediately since the current state is ON
+         * at this point.
+         */
+        imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
+
+        drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
+        drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
+                         DRM_MODE_ENCODER_NONE);
+
+        drm_connector_helper_add(&imxpd->connector,
+                        &imx_pd_connector_helper_funcs);
+        drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
+                           DRM_MODE_CONNECTOR_VGA);
+
+        if (imxpd->panel)
+                drm_panel_attach(imxpd->panel, &imxpd->connector);
+
+        drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
+
+        imxpd->connector.encoder = &imxpd->encoder;
+
+        return 0;
+}
+
+static int imx_pd_bind(struct device *dev, struct device *master, void *data)
+{
+        struct drm_device *drm = data;
+        struct device_node *np = dev->of_node;
+        struct device_node *panel_node;
+        const u8 *edidp;
+        struct imx_parallel_display *imxpd;
+        int ret;
+        const char *fmt;
+
+        imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
+        if (!imxpd)
+                return -ENOMEM;
+
+        edidp = of_get_property(np, "edid", &imxpd->edid_len);
+        if (edidp)
+                imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
+
+        ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
+        if (!ret) {
+                if (!strcmp(fmt, "rgb24"))
+                        imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB24;
+                else if (!strcmp(fmt, "rgb565"))
+                        imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB565;
+                else if (!strcmp(fmt, "bgr666"))
+                        imxpd->interface_pix_fmt = V4L2_PIX_FMT_BGR666;
+                else if (!strcmp(fmt, "lvds666"))
+                        imxpd->interface_pix_fmt =
+                                        v4l2_fourcc('L', 'V', 'D', '6');
+        }
+
+        panel_node = of_parse_phandle(np, "fsl,panel", 0);
+        if (panel_node)
+                imxpd->panel = of_drm_find_panel(panel_node);
+
+        imxpd->dev = dev;
+
+        ret = imx_pd_register(drm, imxpd);
+        if (ret)
+                return ret;
+
+        dev_set_drvdata(dev, imxpd);
+
+        return 0;
+}
+
+static void imx_pd_unbind(struct device *dev, struct device *master,
+        void *data)
+{
+        struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
+
+        imxpd->encoder.funcs->destroy(&imxpd->encoder);
+        imxpd->connector.funcs->destroy(&imxpd->connector);
+}
+
+static const struct component_ops imx_pd_ops = {
+        .bind   = imx_pd_bind,
+        .unbind = imx_pd_unbind,
+};
+
+static int imx_pd_probe(struct platform_device *pdev)
+{
+        return component_add(&pdev->dev, &imx_pd_ops);
+}
+
+static int imx_pd_remove(struct platform_device *pdev)
+{
+        component_del(&pdev->dev, &imx_pd_ops);
+        return 0;
+}
+
+static const struct of_device_id imx_pd_dt_ids[] = {
+        { .compatible = "fsl,imx-parallel-display", },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
+
+static struct platform_driver imx_pd_driver = {
+        .probe          = imx_pd_probe,
+        .remove         = imx_pd_remove,
+        .driver         = {
+                .of_match_table = imx_pd_dt_ids,
+                .name   = "imx-parallel-display",
+        },
+};
+
+module_platform_driver(imx_pd_driver);
+
+MODULE_DESCRIPTION("i.MX parallel display driver");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:imx-parallel-display");