drm/vc4: Add KMS support for Raspberry Pi.

This is enough for fbcon and bringing up X using
xf86-video-modesetting.  It doesn't support the 3D accelerator or
power management yet.

v2: Drop FB_HELPER select thanks to Archit's patches.  Do manual init
    ordering instead of using the .load hook.  Structure registration
    more like tegra's, but still using the typical "component" code.
    Drop no-op hooks for atomic_begin and mode_fixup() now that
    they're optional.  Drop sentinel in Makefile.  Fix minor style
    nits I noticed on another reread.

v3: Use the new bcm2835 clk driver to manage pixel/HSM clocks instead
    of having a fixed video mode.  Use exynos-style component driver
    matching instead of devicetree nodes to list the component driver
    instances.  Rename compatibility strings to say bcm2835, and
    distinguish pv0/1/2.  Clean up some h/vsync code, and add in
    interlaced mode setup.  Fix up probe/bind error paths.  Use
    bitops.h macros for vc4_regs.h

v4: Include i2c.h, allow building under COMPILE_TEST, drop msleep now
    that other bugs have been fixed, add timeouts to cpu_relax()
    loops, rename hpd-gpio to hpd-gpios.

Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 284 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
new file mode 100644
index 000000000000..3c3ccffbc7f5
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -0,0 +1,284 @@
+/*
+ * Copyright (C) 2014-2015 Broadcom
+ * Copyright (C) 2013 Red Hat
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+#define DRIVER_NAME "vc4"
+#define DRIVER_DESC "Broadcom VC4 graphics"
+#define DRIVER_DATE "20140616"
+#define DRIVER_MAJOR 0
+#define DRIVER_MINOR 0
+#define DRIVER_PATCHLEVEL 0
+
+/* Helper function for mapping the regs on a platform device. */
+void __iomem *vc4_ioremap_regs(struct platform_device *dev, int index)
+{
+	struct resource *res;
+	void __iomem *map;
+
+	res = platform_get_resource(dev, IORESOURCE_MEM, index);
+	map = devm_ioremap_resource(&dev->dev, res);
+	if (IS_ERR(map)) {
+		DRM_ERROR("Failed to map registers: %ld\n", PTR_ERR(map));
+		return map;
+	}
+
+	return map;
+}
+
+static void vc4_drm_preclose(struct drm_device *dev, struct drm_file *file)
+{
+	struct drm_crtc *crtc;
+
+	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
+		vc4_cancel_page_flip(crtc, file);
+}
+
+static const struct file_operations vc4_drm_fops = {
+	.owner = THIS_MODULE,
+	.open = drm_open,
+	.release = drm_release,
+	.unlocked_ioctl = drm_ioctl,
+	.mmap = drm_gem_cma_mmap,
+	.poll = drm_poll,
+	.read = drm_read,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = drm_compat_ioctl,
+#endif
+	.llseek = noop_llseek,
+};
+
+static const struct drm_ioctl_desc vc4_drm_ioctls[] = {
+};
+
+static struct drm_driver vc4_drm_driver = {
+	.driver_features = (DRIVER_MODESET |
+			    DRIVER_ATOMIC |
+			    DRIVER_GEM |
+			    DRIVER_PRIME),
+	.preclose = vc4_drm_preclose,
+
+	.enable_vblank = vc4_enable_vblank,
+	.disable_vblank = vc4_disable_vblank,
+	.get_vblank_counter = drm_vblank_count,
+
+#if defined(CONFIG_DEBUG_FS)
+	.debugfs_init = vc4_debugfs_init,
+	.debugfs_cleanup = vc4_debugfs_cleanup,
+#endif
+
+	.gem_free_object = drm_gem_cma_free_object,
+	.gem_vm_ops = &drm_gem_cma_vm_ops,
+
+	.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_export = drm_gem_prime_export,
+	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
+	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+	.gem_prime_vmap = drm_gem_cma_prime_vmap,
+	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
+	.gem_prime_mmap = drm_gem_cma_prime_mmap,
+
+	.dumb_create = vc4_dumb_create,
+	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
+	.dumb_destroy = drm_gem_dumb_destroy,
+
+	.ioctls = vc4_drm_ioctls,
+	.num_ioctls = ARRAY_SIZE(vc4_drm_ioctls),
+	.fops = &vc4_drm_fops,
+
+	.name = DRIVER_NAME,
+	.desc = DRIVER_DESC,
+	.date = DRIVER_DATE,
+	.major = DRIVER_MAJOR,
+	.minor = DRIVER_MINOR,
+	.patchlevel = DRIVER_PATCHLEVEL,
+};
+
+static int compare_dev(struct device *dev, void *data)
+{
+	return dev == data;
+}
+
+static void vc4_match_add_drivers(struct device *dev,
+				  struct component_match **match,
+				  struct platform_driver *const *drivers,
+				  int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		struct device_driver *drv = &drivers[i]->driver;
+		struct device *p = NULL, *d;
+
+		while ((d = bus_find_device(&platform_bus_type, p, drv,
+					    (void *)platform_bus_type.match))) {
+			put_device(p);
+			component_match_add(dev, match, compare_dev, d);
+			p = d;
+		}
+		put_device(p);
+	}
+}
+
+static int vc4_drm_bind(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm;
+	struct drm_connector *connector;
+	struct vc4_dev *vc4;
+	int ret = 0;
+
+	dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+	vc4 = devm_kzalloc(dev, sizeof(*vc4), GFP_KERNEL);
+	if (!vc4)
+		return -ENOMEM;
+
+	drm = drm_dev_alloc(&vc4_drm_driver, dev);
+	if (!drm)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, drm);
+	vc4->dev = drm;
+	drm->dev_private = vc4;
+
+	drm_dev_set_unique(drm, dev_name(dev));
+
+	drm_mode_config_init(drm);
+	if (ret)
+		goto unref;
+
+	ret = component_bind_all(dev, drm);
+	if (ret)
+		goto unref;
+
+	ret = drm_dev_register(drm, 0);
+	if (ret < 0)
+		goto unbind_all;
+
+	/* Connector registration has to occur after DRM device
+	 * registration, because it creates sysfs entries based on the
+	 * DRM device.
+	 */
+	list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
+		ret = drm_connector_register(connector);
+		if (ret)
+			goto unregister;
+	}
+
+	vc4_kms_load(drm);
+
+	return 0;
+
+unregister:
+	drm_dev_unregister(drm);
+unbind_all:
+	component_unbind_all(dev, drm);
+unref:
+	drm_dev_unref(drm);
+	return ret;
+}
+
+static void vc4_drm_unbind(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = platform_get_drvdata(pdev);
+
+	drm_mode_config_cleanup(drm);
+
+	drm_put_dev(drm);
+}
+
+static const struct component_master_ops vc4_drm_ops = {
+	.bind = vc4_drm_bind,
+	.unbind = vc4_drm_unbind,
+};
+
+static struct platform_driver *const component_drivers[] = {
+	&vc4_hdmi_driver,
+	&vc4_crtc_driver,
+	&vc4_hvs_driver,
+};
+
+static int vc4_platform_drm_probe(struct platform_device *pdev)
+{
+	struct component_match *match = NULL;
+	struct device *dev = &pdev->dev;
+
+	vc4_match_add_drivers(dev, &match,
+			      component_drivers, ARRAY_SIZE(component_drivers));
+
+	return component_master_add_with_match(dev, &vc4_drm_ops, match);
+}
+
+static int vc4_platform_drm_remove(struct platform_device *pdev)
+{
+	component_master_del(&pdev->dev, &vc4_drm_ops);
+
+	return 0;
+}
+
+static const struct of_device_id vc4_of_match[] = {
+	{ .compatible = "brcm,bcm2835-vc4", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, vc4_of_match);
+
+static struct platform_driver vc4_platform_driver = {
+	.probe		= vc4_platform_drm_probe,
+	.remove		= vc4_platform_drm_remove,
+	.driver		= {
+		.name	= "vc4-drm",
+		.owner	= THIS_MODULE,
+		.of_match_table = vc4_of_match,
+	},
+};
+
+static int __init vc4_drm_register(void)
+{
+	int i, ret;
+
+	for (i = 0; i < ARRAY_SIZE(component_drivers); i++) {
+		ret = platform_driver_register(component_drivers[i]);
+		if (ret) {
+			while (--i >= 0)
+				platform_driver_unregister(component_drivers[i]);
+			return ret;
+		}
+	}
+	return platform_driver_register(&vc4_platform_driver);
+}
+
+static void __exit vc4_drm_unregister(void)
+{
+	int i;
+
+	for (i = ARRAY_SIZE(component_drivers) - 1; i >= 0; i--)
+		platform_driver_unregister(component_drivers[i]);
+
+	platform_driver_unregister(&vc4_platform_driver);
+}
+
+module_init(vc4_drm_register);
+module_exit(vc4_drm_unregister);
+
+MODULE_ALIAS("platform:vc4-drm");
+MODULE_DESCRIPTION("Broadcom VC4 DRM Driver");
+MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
+MODULE_LICENSE("GPL v2");