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path: root/drivers/gpu/drm/pl111/pl111_drv.c
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Diffstat (limited to 'drivers/gpu/drm/pl111/pl111_drv.c')
-rw-r--r--drivers/gpu/drm/pl111/pl111_drv.c269
1 files changed, 269 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..ac8771be70b0
--- /dev/null
+++ b/drivers/gpu/drm/pl111/pl111_drv.c
@@ -0,0 +1,269 @@
+/*
+ * (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 CLKSEL bit to support switching between the two external
+ * clock parents.
+ */
+
+#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"
+
+static 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,
+
+#if defined(CONFIG_DEBUG_FS)
+ .debugfs_init = pl111_debugfs_init,
+#endif
+};
+
+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->regs = devm_ioremap_resource(dev, &amba_dev->res);
+ if (IS_ERR(priv->regs)) {
+ dev_err(dev, "%s failed mmio\n", __func__);
+ return PTR_ERR(priv->regs);
+ }
+
+ /* 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 __maybe_unused = {
+ .drv = {
+ .name = "drm-clcd-pl111",
+ },
+ .probe = pl111_amba_probe,
+ .remove = pl111_amba_remove,
+ .id_table = pl111_id_table,
+};
+
+#ifdef CONFIG_ARM_AMBA
+module_amba_driver(pl111_amba_driver);
+#endif
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("ARM Ltd.");
+MODULE_LICENSE("GPL");