Import drm_patform.c, an implementation of non-PCI based attachment

for graphics drivers.
It will be used in upcoming driver for Nvidia Tegra boards.

MFC after: 1 month

sys/conf/files

@@ -1544,6 +1544,7 @@ dev/drm2/drm_memory.c		optional drm2
 dev/drm2/drm_mm.c		optional drm2
 dev/drm2/drm_modes.c		optional drm2
 dev/drm2/drm_pci.c		optional drm2
+dev/drm2/drm_platform.c		optional drm2
 dev/drm2/drm_scatter.c		optional drm2
 dev/drm2/drm_stub.c		optional drm2
 dev/drm2/drm_sysctl.c		optional drm2

sys/dev/drm2/drmP.h

@@ -1576,6 +1576,10 @@ extern int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *speed_mask);
 
 #define	drm_can_sleep()	(DRM_HZ & 1)
 
+/* Platform section */
+int drm_get_platform_dev(device_t kdev, struct drm_device *dev,
+			 struct drm_driver *driver);
+
 /* FreeBSD specific -- should be moved to drm_os_freebsd.h */
 
 #define	DRM_GEM_MAPPING_MASK	(3ULL << 62)

sys/dev/drm2/drm_platform.c

@@ -0,0 +1,183 @@
+/*
+ * Derived from drm_pci.c
+ *
+ * Copyright 2003 José Fonseca.
+ * Copyright 2003 Leif Delgass.
+ * Copyright (c) 2009, Code Aurora Forum.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <dev/drm2/drmP.h>
+
+static void drm_platform_free_irq(struct drm_device *dev)
+{
+	if (dev->irqr == NULL)
+		return;
+
+	bus_release_resource(dev->dev, SYS_RES_IRQ,
+	    dev->irqrid, dev->irqr);
+
+	dev->irqr = NULL;
+	dev->irq = 0;
+}
+
+static const char *drm_platform_get_name(struct drm_device *dev)
+{
+	return dev->driver->name;
+}
+
+static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
+{
+	int len, ret, id;
+
+	master->unique_len = 13 + strlen(dev->driver->name);
+	master->unique_size = master->unique_len;
+	master->unique = malloc(master->unique_len + 1, DRM_MEM_DRIVER, M_NOWAIT);
+
+	if (master->unique == NULL)
+		return -ENOMEM;
+
+	id = 0; // XXX dev->driver->id;
+
+	/* if only a single instance of the platform device, id will be
+	 * set to -1.. use 0 instead to avoid a funny looking bus-id:
+	 */
+	if (id == -1)
+		id = 0;
+
+	len = snprintf(master->unique, master->unique_len,
+			"platform:%s:%02d", dev->driver->name, id);
+
+	if (len > master->unique_len) {
+		DRM_ERROR("Unique buffer overflowed\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
+	return 0;
+err:
+	return ret;
+}
+
+static int drm_platform_get_irq(struct drm_device *dev)
+{
+	if (dev->irqr)
+		return (dev->irq);
+
+	dev->irqr = bus_alloc_resource_any(dev->dev, SYS_RES_IRQ,
+	    &dev->irqrid, RF_SHAREABLE);
+	if (!dev->irqr) {
+		dev_err(dev->dev, "Failed to allocate IRQ\n");
+		return (0);
+	}
+
+	dev->irq = (int) rman_get_start(dev->irqr);
+
+	return (dev->irq);
+}
+
+static struct drm_bus drm_platform_bus = {
+	.bus_type = DRIVER_BUS_PLATFORM,
+	.get_irq = drm_platform_get_irq,
+	.free_irq = drm_platform_free_irq,
+	.get_name = drm_platform_get_name,
+	.set_busid = drm_platform_set_busid,
+};
+
+/**
+ * Register.
+ *
+ * \param platdev - Platform device struture
+ * \return zero on success or a negative number on failure.
+ *
+ * Attempt to gets inter module "drm" information. If we are first
+ * then register the character device and inter module information.
+ * Try and register, if we fail to register, backout previous work.
+ */
+
+int drm_get_platform_dev(device_t kdev, struct drm_device *dev,
+			 struct drm_driver *driver)
+{
+	int ret;
+
+	DRM_DEBUG("\n");
+
+	driver->bus = &drm_platform_bus;
+
+	dev->dev = kdev;
+
+	sx_xlock(&drm_global_mutex);
+
+	ret = drm_fill_in_dev(dev, driver);
+
+	if (ret) {
+		printf("DRM: Fill_in_dev failed.\n");
+		goto err_g1;
+	}
+
+	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+		ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
+		if (ret)
+			goto err_g1;
+	}
+
+	ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
+	if (ret)
+		goto err_g2;
+
+	if (dev->driver->load) {
+		ret = dev->driver->load(dev, 0);
+		if (ret)
+			goto err_g3;
+	}
+
+	/* setup the grouping for the legacy output */
+	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+		ret = drm_mode_group_init_legacy_group(dev,
+				&dev->primary->mode_group);
+		if (ret)
+			goto err_g3;
+	}
+
+#ifdef FREEBSD_NOTYET
+	list_add_tail(&dev->driver_item, &driver->device_list);
+#endif /* FREEBSD_NOTYET */
+
+	sx_xunlock(&drm_global_mutex);
+
+	DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
+		 driver->name, driver->major, driver->minor, driver->patchlevel,
+		 driver->date, dev->primary->index);
+
+	return 0;
+
+err_g3:
+	drm_put_minor(&dev->primary);
+err_g2:
+	if (drm_core_check_feature(dev, DRIVER_MODESET))
+		drm_put_minor(&dev->control);
+err_g1:
+	sx_xunlock(&drm_global_mutex);
+	return ret;
+}
+EXPORT_SYMBOL(drm_get_platform_dev);