1 files changed, 272 insertions, 0 deletions
diff --git a/drivers/gpu/drm/pl111/pl111_drv.c b/drivers/gpu/drm/pl111/pl111_drv.c
new file mode 100644
index 000000000000..936403f65508
--- /dev/null
+++ b/drivers/gpu/drm/pl111/pl111_drv.c
@@ -0,0 +1,272 @@
+/*
+ * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
+ *
+ * Parts of this file were based on sources as follows:
+ *
+ * Copyright (c) 2006-2008 Intel Corporation
+ * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
+ * Copyright (C) 2011 Texas Instruments
+ *
+ * This program is free software and is provided to you under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation, and any use by you of this program is subject to the terms of
+ * such GNU licence.
+ *
+ */
+
+/**
+ * DOC: ARM PrimeCell PL111 CLCD Driver
+ *
+ * The PL111 is a simple LCD controller that can support TFT and STN
+ * displays.  This driver exposes a standard KMS interface for them.
+ *
+ * This driver uses the same Device Tree binding as the fbdev CLCD
+ * driver.  While the fbdev driver supports panels that may be
+ * connected to the CLCD internally to the CLCD driver, in DRM the
+ * panels get split out to drivers/gpu/drm/panels/.  This means that,
+ * in converting from using fbdev to using DRM, you also need to write
+ * a panel driver (which may be as simple as an entry in
+ * panel-simple.c).
+ *
+ * The driver currently doesn't expose the cursor.  The DRM API for
+ * cursors requires support for 64x64 ARGB8888 cursor images, while
+ * the hardware can only support 64x64 monochrome with masking
+ * cursors.  While one could imagine trying to hack something together
+ * to look at the ARGB8888 and program reasonable in monochrome, we
+ * just don't expose the cursor at all instead, and leave cursor
+ * support to the X11 software cursor layer.
+ *
+ * TODO:
+ *
+ * - Fix race between setting plane base address and getting IRQ for
+ *   vsync firing the pageflip completion.
+ *
+ * - Expose the correct set of formats we can support based on the
+ *   "arm,pl11x,tft-r0g0b0-pads" DT property.
+ *
+ * - Use the "max-memory-bandwidth" DT property to filter the
+ *   supported formats.
+ *
+ * - Read back hardware state at boot to skip reprogramming the
+ *   hardware when doing a no-op modeset.
+ *
+ * - Use the internal clock divisor to reduce power consumption by
+ *   using HCLK (apb_pclk) when appropriate.
+ */
+
+#include <linux/amba/bus.h>
+#include <linux/amba/clcd-regs.h>
+#include <linux/version.h>
+#include <linux/shmem_fs.h>
+#include <linux/dma-buf.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+
+#include "pl111_drm.h"
+
+#define DRIVER_DESC      "DRM module for PL111"
+
+struct drm_mode_config_funcs mode_config_funcs = {
+	.fb_create = drm_fb_cma_create,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static int pl111_modeset_init(struct drm_device *dev)
+{
+	struct drm_mode_config *mode_config;
+	struct pl111_drm_dev_private *priv = dev->dev_private;
+	int ret = 0;
+
+	drm_mode_config_init(dev);
+	mode_config = &dev->mode_config;
+	mode_config->funcs = &mode_config_funcs;
+	mode_config->min_width = 1;
+	mode_config->max_width = 1024;
+	mode_config->min_height = 1;
+	mode_config->max_height = 768;
+
+	ret = pl111_connector_init(dev);
+	if (ret) {
+		dev_err(dev->dev, "Failed to create pl111_drm_connector\n");
+		goto out_config;
+	}
+
+	/* Don't actually attach if we didn't find a drm_panel
+	 * attached to us.  This will allow a kernel to include both
+	 * the fbdev pl111 driver and this one, and choose between
+	 * them based on which subsystem has support for the panel.
+	 */
+	if (!priv->connector.panel) {
+		dev_info(dev->dev,
+			 "Disabling due to lack of DRM panel device.\n");
+		ret = -ENODEV;
+		goto out_config;
+	}
+
+	ret = pl111_display_init(dev);
+	if (ret != 0) {
+		dev_err(dev->dev, "Failed to init display\n");
+		goto out_config;
+	}
+
+	ret = drm_vblank_init(dev, 1);
+	if (ret != 0) {
+		dev_err(dev->dev, "Failed to init vblank\n");
+		goto out_config;
+	}
+
+	drm_mode_config_reset(dev);
+
+	priv->fbdev = drm_fbdev_cma_init(dev, 32,
+					 dev->mode_config.num_connector);
+
+	drm_kms_helper_poll_init(dev);
+
+	goto finish;
+
+out_config:
+	drm_mode_config_cleanup(dev);
+finish:
+	return ret;
+}
+
+DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
+
+static void pl111_lastclose(struct drm_device *dev)
+{
+	struct pl111_drm_dev_private *priv = dev->dev_private;
+
+	drm_fbdev_cma_restore_mode(priv->fbdev);
+}
+
+static struct drm_driver pl111_drm_driver = {
+	.driver_features =
+		DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
+	.lastclose = pl111_lastclose,
+	.ioctls = NULL,
+	.fops = &drm_fops,
+	.name = "pl111",
+	.desc = DRIVER_DESC,
+	.date = "20170317",
+	.major = 1,
+	.minor = 0,
+	.patchlevel = 0,
+	.dumb_create = drm_gem_cma_dumb_create,
+	.dumb_destroy = drm_gem_dumb_destroy,
+	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
+	.gem_free_object = drm_gem_cma_free_object,
+	.gem_vm_ops = &drm_gem_cma_vm_ops,
+
+	.enable_vblank = pl111_enable_vblank,
+	.disable_vblank = pl111_disable_vblank,
+
+	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+	.gem_prime_import = drm_gem_prime_import,
+	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+	.gem_prime_export = drm_gem_prime_export,
+	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
+};
+
+#ifdef CONFIG_ARM_AMBA
+static int pl111_amba_probe(struct amba_device *amba_dev,
+			    const struct amba_id *id)
+{
+	struct device *dev = &amba_dev->dev;
+	struct pl111_drm_dev_private *priv;
+	struct drm_device *drm;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	drm = drm_dev_alloc(&pl111_drm_driver, dev);
+	if (IS_ERR(drm))
+		return PTR_ERR(drm);
+	amba_set_drvdata(amba_dev, drm);
+	priv->drm = drm;
+	drm->dev_private = priv;
+
+	priv->clk = devm_clk_get(dev, "clcdclk");
+	if (IS_ERR(priv->clk)) {
+		dev_err(dev, "CLCD: unable to get clk.\n");
+		ret = PTR_ERR(priv->clk);
+		goto dev_unref;
+	}
+
+	priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
+	if (!priv->regs) {
+		dev_err(dev, "%s failed mmio\n", __func__);
+		return -EINVAL;
+	}
+
+	/* turn off interrupts before requesting the irq */
+	writel(0, priv->regs + CLCD_PL111_IENB);
+
+	ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
+			       "pl111", priv);
+	if (ret != 0) {
+		dev_err(dev, "%s failed irq %d\n", __func__, ret);
+		return ret;
+	}
+
+	ret = pl111_modeset_init(drm);
+	if (ret != 0)
+		goto dev_unref;
+
+	ret = drm_dev_register(drm, 0);
+	if (ret < 0)
+		goto dev_unref;
+
+	return 0;
+
+dev_unref:
+	drm_dev_unref(drm);
+	return ret;
+}
+
+static int pl111_amba_remove(struct amba_device *amba_dev)
+{
+	struct drm_device *drm = amba_get_drvdata(amba_dev);
+	struct pl111_drm_dev_private *priv = drm->dev_private;
+
+	drm_dev_unregister(drm);
+	if (priv->fbdev)
+		drm_fbdev_cma_fini(priv->fbdev);
+	drm_mode_config_cleanup(drm);
+	drm_dev_unref(drm);
+
+	return 0;
+}
+
+static struct amba_id pl111_id_table[] = {
+	{
+		.id = 0x00041111,
+		.mask = 0x000fffff,
+	},
+	{0, 0},
+};
+
+static struct amba_driver pl111_amba_driver = {
+	.drv = {
+		.name = "drm-clcd-pl111",
+	},
+	.probe = pl111_amba_probe,
+	.remove = pl111_amba_remove,
+	.id_table = pl111_id_table,
+};
+
+module_amba_driver(pl111_amba_driver);
+#endif /* CONFIG_ARM_AMBA */
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("ARM Ltd.");
+MODULE_LICENSE("GPL");