From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/gpu/drm/tiny/cirrus.c | 756 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 756 insertions(+)
 create mode 100644 drivers/gpu/drm/tiny/cirrus.c

(limited to 'drivers/gpu/drm/tiny/cirrus.c')

diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c
new file mode 100644
index 0000000000..594bc47286
--- /dev/null
+++ b/drivers/gpu/drm/tiny/cirrus.c
@@ -0,0 +1,756 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2012-2019 Red Hat
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License version 2. See the file COPYING in the main
+ * directory of this archive for more details.
+ *
+ * Authors: Matthew Garrett
+ *	    Dave Airlie
+ *	    Gerd Hoffmann
+ *
+ * Portions of this code derived from cirrusfb.c:
+ * drivers/video/cirrusfb.c - driver for Cirrus Logic chipsets
+ *
+ * Copyright 1999-2001 Jeff Garzik <jgarzik@pobox.com>
+ */
+
+#include <linux/iosys-map.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include <video/cirrus.h>
+#include <video/vga.h>
+
+#include <drm/drm_aperture.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fbdev_generic.h>
+#include <drm/drm_file.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_ioctl.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_module.h>
+#include <drm/drm_probe_helper.h>
+
+#define DRIVER_NAME "cirrus"
+#define DRIVER_DESC "qemu cirrus vga"
+#define DRIVER_DATE "2019"
+#define DRIVER_MAJOR 2
+#define DRIVER_MINOR 0
+
+#define CIRRUS_MAX_PITCH (0x1FF << 3)      /* (4096 - 1) & ~111b bytes */
+#define CIRRUS_VRAM_SIZE (4 * 1024 * 1024) /* 4 MB */
+
+struct cirrus_device {
+	struct drm_device	       dev;
+
+	/* modesetting pipeline */
+	struct drm_plane	       primary_plane;
+	struct drm_crtc		       crtc;
+	struct drm_encoder	       encoder;
+	struct drm_connector	       connector;
+
+	/* HW resources */
+	void __iomem		       *vram;
+	void __iomem		       *mmio;
+};
+
+#define to_cirrus(_dev) container_of(_dev, struct cirrus_device, dev)
+
+struct cirrus_primary_plane_state {
+	struct drm_shadow_plane_state base;
+
+	/* HW scanout buffer */
+	const struct drm_format_info   *format;
+	unsigned int		       pitch;
+};
+
+static inline struct cirrus_primary_plane_state *
+to_cirrus_primary_plane_state(struct drm_plane_state *plane_state)
+{
+	return container_of(plane_state, struct cirrus_primary_plane_state, base.base);
+};
+
+/* ------------------------------------------------------------------ */
+/*
+ * The meat of this driver. The core passes us a mode and we have to program
+ * it. The modesetting here is the bare minimum required to satisfy the qemu
+ * emulation of this hardware, and running this against a real device is
+ * likely to result in an inadequately programmed mode. We've already had
+ * the opportunity to modify the mode, so whatever we receive here should
+ * be something that can be correctly programmed and displayed
+ */
+
+#define SEQ_INDEX 4
+#define SEQ_DATA 5
+
+static u8 rreg_seq(struct cirrus_device *cirrus, u8 reg)
+{
+	iowrite8(reg, cirrus->mmio + SEQ_INDEX);
+	return ioread8(cirrus->mmio + SEQ_DATA);
+}
+
+static void wreg_seq(struct cirrus_device *cirrus, u8 reg, u8 val)
+{
+	iowrite8(reg, cirrus->mmio + SEQ_INDEX);
+	iowrite8(val, cirrus->mmio + SEQ_DATA);
+}
+
+#define CRT_INDEX 0x14
+#define CRT_DATA 0x15
+
+static u8 rreg_crt(struct cirrus_device *cirrus, u8 reg)
+{
+	iowrite8(reg, cirrus->mmio + CRT_INDEX);
+	return ioread8(cirrus->mmio + CRT_DATA);
+}
+
+static void wreg_crt(struct cirrus_device *cirrus, u8 reg, u8 val)
+{
+	iowrite8(reg, cirrus->mmio + CRT_INDEX);
+	iowrite8(val, cirrus->mmio + CRT_DATA);
+}
+
+#define GFX_INDEX 0xe
+#define GFX_DATA 0xf
+
+static void wreg_gfx(struct cirrus_device *cirrus, u8 reg, u8 val)
+{
+	iowrite8(reg, cirrus->mmio + GFX_INDEX);
+	iowrite8(val, cirrus->mmio + GFX_DATA);
+}
+
+#define VGA_DAC_MASK  0x06
+
+static void wreg_hdr(struct cirrus_device *cirrus, u8 val)
+{
+	ioread8(cirrus->mmio + VGA_DAC_MASK);
+	ioread8(cirrus->mmio + VGA_DAC_MASK);
+	ioread8(cirrus->mmio + VGA_DAC_MASK);
+	ioread8(cirrus->mmio + VGA_DAC_MASK);
+	iowrite8(val, cirrus->mmio + VGA_DAC_MASK);
+}
+
+static const struct drm_format_info *cirrus_convert_to(struct drm_framebuffer *fb)
+{
+	if (fb->format->format == DRM_FORMAT_XRGB8888 && fb->pitches[0] > CIRRUS_MAX_PITCH) {
+		if (fb->width * 3 <= CIRRUS_MAX_PITCH)
+			/* convert from XR24 to RG24 */
+			return drm_format_info(DRM_FORMAT_RGB888);
+		else
+			/* convert from XR24 to RG16 */
+			return drm_format_info(DRM_FORMAT_RGB565);
+	}
+	return NULL;
+}
+
+static const struct drm_format_info *cirrus_format(struct drm_framebuffer *fb)
+{
+	const struct drm_format_info *format = cirrus_convert_to(fb);
+
+	if (format)
+		return format;
+	return fb->format;
+}
+
+static int cirrus_pitch(struct drm_framebuffer *fb)
+{
+	const struct drm_format_info *format = cirrus_convert_to(fb);
+
+	if (format)
+		return drm_format_info_min_pitch(format, 0, fb->width);
+	return fb->pitches[0];
+}
+
+static void cirrus_set_start_address(struct cirrus_device *cirrus, u32 offset)
+{
+	u32 addr;
+	u8 tmp;
+
+	addr = offset >> 2;
+	wreg_crt(cirrus, 0x0c, (u8)((addr >> 8) & 0xff));
+	wreg_crt(cirrus, 0x0d, (u8)(addr & 0xff));
+
+	tmp = rreg_crt(cirrus, 0x1b);
+	tmp &= 0xf2;
+	tmp |= (addr >> 16) & 0x01;
+	tmp |= (addr >> 15) & 0x0c;
+	wreg_crt(cirrus, 0x1b, tmp);
+
+	tmp = rreg_crt(cirrus, 0x1d);
+	tmp &= 0x7f;
+	tmp |= (addr >> 12) & 0x80;
+	wreg_crt(cirrus, 0x1d, tmp);
+}
+
+static void cirrus_mode_set(struct cirrus_device *cirrus,
+			    struct drm_display_mode *mode)
+{
+	int hsyncstart, hsyncend, htotal, hdispend;
+	int vtotal, vdispend;
+	int tmp;
+
+	htotal = mode->htotal / 8;
+	hsyncend = mode->hsync_end / 8;
+	hsyncstart = mode->hsync_start / 8;
+	hdispend = mode->hdisplay / 8;
+
+	vtotal = mode->vtotal;
+	vdispend = mode->vdisplay;
+
+	vdispend -= 1;
+	vtotal -= 2;
+
+	htotal -= 5;
+	hdispend -= 1;
+	hsyncstart += 1;
+	hsyncend += 1;
+
+	wreg_crt(cirrus, VGA_CRTC_V_SYNC_END, 0x20);
+	wreg_crt(cirrus, VGA_CRTC_H_TOTAL, htotal);
+	wreg_crt(cirrus, VGA_CRTC_H_DISP, hdispend);
+	wreg_crt(cirrus, VGA_CRTC_H_SYNC_START, hsyncstart);
+	wreg_crt(cirrus, VGA_CRTC_H_SYNC_END, hsyncend);
+	wreg_crt(cirrus, VGA_CRTC_V_TOTAL, vtotal & 0xff);
+	wreg_crt(cirrus, VGA_CRTC_V_DISP_END, vdispend & 0xff);
+
+	tmp = 0x40;
+	if ((vdispend + 1) & 512)
+		tmp |= 0x20;
+	wreg_crt(cirrus, VGA_CRTC_MAX_SCAN, tmp);
+
+	/*
+	 * Overflow bits for values that don't fit in the standard registers
+	 */
+	tmp = 0x10;
+	if (vtotal & 0x100)
+		tmp |= 0x01;
+	if (vdispend & 0x100)
+		tmp |= 0x02;
+	if ((vdispend + 1) & 0x100)
+		tmp |= 0x08;
+	if (vtotal & 0x200)
+		tmp |= 0x20;
+	if (vdispend & 0x200)
+		tmp |= 0x40;
+	wreg_crt(cirrus, VGA_CRTC_OVERFLOW, tmp);
+
+	tmp = 0;
+
+	/* More overflow bits */
+
+	if ((htotal + 5) & 0x40)
+		tmp |= 0x10;
+	if ((htotal + 5) & 0x80)
+		tmp |= 0x20;
+	if (vtotal & 0x100)
+		tmp |= 0x40;
+	if (vtotal & 0x200)
+		tmp |= 0x80;
+
+	wreg_crt(cirrus, CL_CRT1A, tmp);
+
+	/* Disable Hercules/CGA compatibility */
+	wreg_crt(cirrus, VGA_CRTC_MODE, 0x03);
+}
+
+static void cirrus_format_set(struct cirrus_device *cirrus,
+			      const struct drm_format_info *format)
+{
+	u8 sr07, hdr;
+
+	sr07 = rreg_seq(cirrus, 0x07);
+	sr07 &= 0xe0;
+
+	switch (format->format) {
+	case DRM_FORMAT_C8:
+		sr07 |= 0x11;
+		hdr = 0x00;
+		break;
+	case DRM_FORMAT_RGB565:
+		sr07 |= 0x17;
+		hdr = 0xc1;
+		break;
+	case DRM_FORMAT_RGB888:
+		sr07 |= 0x15;
+		hdr = 0xc5;
+		break;
+	case DRM_FORMAT_XRGB8888:
+		sr07 |= 0x19;
+		hdr = 0xc5;
+		break;
+	default:
+		return;
+	}
+
+	wreg_seq(cirrus, 0x7, sr07);
+
+	/* Enable high-colour modes */
+	wreg_gfx(cirrus, VGA_GFX_MODE, 0x40);
+
+	/* And set graphics mode */
+	wreg_gfx(cirrus, VGA_GFX_MISC, 0x01);
+
+	wreg_hdr(cirrus, hdr);
+}
+
+static void cirrus_pitch_set(struct cirrus_device *cirrus, unsigned int pitch)
+{
+	u8 cr13, cr1b;
+
+	/* Program the pitch */
+	cr13 = pitch / 8;
+	wreg_crt(cirrus, VGA_CRTC_OFFSET, cr13);
+
+	/* Enable extended blanking and pitch bits, and enable full memory */
+	cr1b = 0x22;
+	cr1b |= (pitch >> 7) & 0x10;
+	cr1b |= (pitch >> 6) & 0x40;
+	wreg_crt(cirrus, 0x1b, cr1b);
+
+	cirrus_set_start_address(cirrus, 0);
+}
+
+/* ------------------------------------------------------------------ */
+/* cirrus display pipe						      */
+
+static const uint32_t cirrus_primary_plane_formats[] = {
+	DRM_FORMAT_RGB565,
+	DRM_FORMAT_RGB888,
+	DRM_FORMAT_XRGB8888,
+};
+
+static const uint64_t cirrus_primary_plane_format_modifiers[] = {
+	DRM_FORMAT_MOD_LINEAR,
+	DRM_FORMAT_MOD_INVALID
+};
+
+static int cirrus_primary_plane_helper_atomic_check(struct drm_plane *plane,
+						    struct drm_atomic_state *state)
+{
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct cirrus_primary_plane_state *new_primary_plane_state =
+		to_cirrus_primary_plane_state(new_plane_state);
+	struct drm_framebuffer *fb = new_plane_state->fb;
+	struct drm_crtc *new_crtc = new_plane_state->crtc;
+	struct drm_crtc_state *new_crtc_state = NULL;
+	int ret;
+	unsigned int pitch;
+
+	if (new_crtc)
+		new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
+
+	ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
+						  DRM_PLANE_NO_SCALING,
+						  DRM_PLANE_NO_SCALING,
+						  false, false);
+	if (ret)
+		return ret;
+	else if (!new_plane_state->visible)
+		return 0;
+
+	pitch = cirrus_pitch(fb);
+
+	/* validate size constraints */
+	if (pitch > CIRRUS_MAX_PITCH)
+		return -EINVAL;
+	else if (pitch * fb->height > CIRRUS_VRAM_SIZE)
+		return -EINVAL;
+
+	new_primary_plane_state->format = cirrus_format(fb);
+	new_primary_plane_state->pitch = pitch;
+
+	return 0;
+}
+
+static void cirrus_primary_plane_helper_atomic_update(struct drm_plane *plane,
+						      struct drm_atomic_state *state)
+{
+	struct cirrus_device *cirrus = to_cirrus(plane->dev);
+	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct cirrus_primary_plane_state *primary_plane_state =
+		to_cirrus_primary_plane_state(plane_state);
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+	struct drm_framebuffer *fb = plane_state->fb;
+	const struct drm_format_info *format = primary_plane_state->format;
+	unsigned int pitch = primary_plane_state->pitch;
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+	struct cirrus_primary_plane_state *old_primary_plane_state =
+		to_cirrus_primary_plane_state(old_plane_state);
+	struct iosys_map vaddr = IOSYS_MAP_INIT_VADDR_IOMEM(cirrus->vram);
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect damage;
+	int idx;
+
+	if (!fb)
+		return;
+
+	if (!drm_dev_enter(&cirrus->dev, &idx))
+		return;
+
+	if (old_primary_plane_state->format != format)
+		cirrus_format_set(cirrus, format);
+	if (old_primary_plane_state->pitch != pitch)
+		cirrus_pitch_set(cirrus, pitch);
+
+	drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
+	drm_atomic_for_each_plane_damage(&iter, &damage) {
+		unsigned int offset = drm_fb_clip_offset(pitch, format, &damage);
+		struct iosys_map dst = IOSYS_MAP_INIT_OFFSET(&vaddr, offset);
+
+		drm_fb_blit(&dst, &pitch, format->format, shadow_plane_state->data, fb, &damage);
+	}
+
+	drm_dev_exit(idx);
+}
+
+static const struct drm_plane_helper_funcs cirrus_primary_plane_helper_funcs = {
+	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+	.atomic_check = cirrus_primary_plane_helper_atomic_check,
+	.atomic_update = cirrus_primary_plane_helper_atomic_update,
+};
+
+static struct drm_plane_state *
+cirrus_primary_plane_atomic_duplicate_state(struct drm_plane *plane)
+{
+	struct drm_plane_state *plane_state = plane->state;
+	struct cirrus_primary_plane_state *primary_plane_state =
+		to_cirrus_primary_plane_state(plane_state);
+	struct cirrus_primary_plane_state *new_primary_plane_state;
+	struct drm_shadow_plane_state *new_shadow_plane_state;
+
+	if (!plane_state)
+		return NULL;
+
+	new_primary_plane_state = kzalloc(sizeof(*new_primary_plane_state), GFP_KERNEL);
+	if (!new_primary_plane_state)
+		return NULL;
+	new_shadow_plane_state = &new_primary_plane_state->base;
+
+	__drm_gem_duplicate_shadow_plane_state(plane, new_shadow_plane_state);
+	new_primary_plane_state->format = primary_plane_state->format;
+	new_primary_plane_state->pitch = primary_plane_state->pitch;
+
+	return &new_shadow_plane_state->base;
+}
+
+static void cirrus_primary_plane_atomic_destroy_state(struct drm_plane *plane,
+						      struct drm_plane_state *plane_state)
+{
+	struct cirrus_primary_plane_state *primary_plane_state =
+		to_cirrus_primary_plane_state(plane_state);
+
+	__drm_gem_destroy_shadow_plane_state(&primary_plane_state->base);
+	kfree(primary_plane_state);
+}
+
+static void cirrus_reset_primary_plane(struct drm_plane *plane)
+{
+	struct cirrus_primary_plane_state *primary_plane_state;
+
+	if (plane->state) {
+		cirrus_primary_plane_atomic_destroy_state(plane, plane->state);
+		plane->state = NULL; /* must be set to NULL here */
+	}
+
+	primary_plane_state = kzalloc(sizeof(*primary_plane_state), GFP_KERNEL);
+	if (!primary_plane_state)
+		return;
+	__drm_gem_reset_shadow_plane(plane, &primary_plane_state->base);
+}
+
+static const struct drm_plane_funcs cirrus_primary_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = drm_plane_cleanup,
+	.reset = cirrus_reset_primary_plane,
+	.atomic_duplicate_state = cirrus_primary_plane_atomic_duplicate_state,
+	.atomic_destroy_state = cirrus_primary_plane_atomic_destroy_state,
+};
+
+static int cirrus_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+	int ret;
+
+	if (!crtc_state->enable)
+		return 0;
+
+	ret = drm_atomic_helper_check_crtc_primary_plane(crtc_state);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void cirrus_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+					     struct drm_atomic_state *state)
+{
+	struct cirrus_device *cirrus = to_cirrus(crtc->dev);
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+	int idx;
+
+	if (!drm_dev_enter(&cirrus->dev, &idx))
+		return;
+
+	cirrus_mode_set(cirrus, &crtc_state->mode);
+
+	/* Unblank (needed on S3 resume, vgabios doesn't do it then) */
+	outb(VGA_AR_ENABLE_DISPLAY, VGA_ATT_W);
+
+	drm_dev_exit(idx);
+}
+
+static const struct drm_crtc_helper_funcs cirrus_crtc_helper_funcs = {
+	.atomic_check = cirrus_crtc_helper_atomic_check,
+	.atomic_enable = cirrus_crtc_helper_atomic_enable,
+};
+
+static const struct drm_crtc_funcs cirrus_crtc_funcs = {
+	.reset = drm_atomic_helper_crtc_reset,
+	.destroy = drm_crtc_cleanup,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static const struct drm_encoder_funcs cirrus_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static int cirrus_connector_helper_get_modes(struct drm_connector *connector)
+{
+	int count;
+
+	count = drm_add_modes_noedid(connector,
+				     connector->dev->mode_config.max_width,
+				     connector->dev->mode_config.max_height);
+	drm_set_preferred_mode(connector, 1024, 768);
+	return count;
+}
+
+static const struct drm_connector_helper_funcs cirrus_connector_helper_funcs = {
+	.get_modes = cirrus_connector_helper_get_modes,
+};
+
+static const struct drm_connector_funcs cirrus_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int cirrus_pipe_init(struct cirrus_device *cirrus)
+{
+	struct drm_device *dev = &cirrus->dev;
+	struct drm_plane *primary_plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	int ret;
+
+	primary_plane = &cirrus->primary_plane;
+	ret = drm_universal_plane_init(dev, primary_plane, 0,
+				       &cirrus_primary_plane_funcs,
+				       cirrus_primary_plane_formats,
+				       ARRAY_SIZE(cirrus_primary_plane_formats),
+				       cirrus_primary_plane_format_modifiers,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+	drm_plane_helper_add(primary_plane, &cirrus_primary_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(primary_plane);
+
+	crtc = &cirrus->crtc;
+	ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
+					&cirrus_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+	drm_crtc_helper_add(crtc, &cirrus_crtc_helper_funcs);
+
+	encoder = &cirrus->encoder;
+	ret = drm_encoder_init(dev, encoder, &cirrus_encoder_funcs,
+			       DRM_MODE_ENCODER_DAC, NULL);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	connector = &cirrus->connector;
+	ret = drm_connector_init(dev, connector, &cirrus_connector_funcs,
+				 DRM_MODE_CONNECTOR_VGA);
+	if (ret)
+		return ret;
+	drm_connector_helper_add(connector, &cirrus_connector_helper_funcs);
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------------ */
+/* cirrus framebuffers & mode config				      */
+
+static enum drm_mode_status cirrus_mode_config_mode_valid(struct drm_device *dev,
+							  const struct drm_display_mode *mode)
+{
+	const struct drm_format_info *format = drm_format_info(DRM_FORMAT_XRGB8888);
+	uint64_t pitch = drm_format_info_min_pitch(format, 0, mode->hdisplay);
+
+	if (pitch * mode->vdisplay > CIRRUS_VRAM_SIZE)
+		return MODE_MEM;
+
+	return MODE_OK;
+}
+
+static const struct drm_mode_config_funcs cirrus_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.mode_valid = cirrus_mode_config_mode_valid,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static int cirrus_mode_config_init(struct cirrus_device *cirrus)
+{
+	struct drm_device *dev = &cirrus->dev;
+	int ret;
+
+	ret = drmm_mode_config_init(dev);
+	if (ret)
+		return ret;
+
+	dev->mode_config.min_width = 0;
+	dev->mode_config.min_height = 0;
+	dev->mode_config.max_width = CIRRUS_MAX_PITCH / 2;
+	dev->mode_config.max_height = 1024;
+	dev->mode_config.preferred_depth = 16;
+	dev->mode_config.prefer_shadow = 0;
+	dev->mode_config.funcs = &cirrus_mode_config_funcs;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------------ */
+
+DEFINE_DRM_GEM_FOPS(cirrus_fops);
+
+static const struct drm_driver cirrus_driver = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
+
+	.name		 = DRIVER_NAME,
+	.desc		 = DRIVER_DESC,
+	.date		 = DRIVER_DATE,
+	.major		 = DRIVER_MAJOR,
+	.minor		 = DRIVER_MINOR,
+
+	.fops		 = &cirrus_fops,
+	DRM_GEM_SHMEM_DRIVER_OPS,
+};
+
+static int cirrus_pci_probe(struct pci_dev *pdev,
+			    const struct pci_device_id *ent)
+{
+	struct drm_device *dev;
+	struct cirrus_device *cirrus;
+	int ret;
+
+	ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &cirrus_driver);
+	if (ret)
+		return ret;
+
+	ret = pcim_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	ret = pci_request_regions(pdev, DRIVER_NAME);
+	if (ret)
+		return ret;
+
+	ret = -ENOMEM;
+	cirrus = devm_drm_dev_alloc(&pdev->dev, &cirrus_driver,
+				    struct cirrus_device, dev);
+	if (IS_ERR(cirrus))
+		return PTR_ERR(cirrus);
+
+	dev = &cirrus->dev;
+
+	cirrus->vram = devm_ioremap(&pdev->dev, pci_resource_start(pdev, 0),
+				    pci_resource_len(pdev, 0));
+	if (cirrus->vram == NULL)
+		return -ENOMEM;
+
+	cirrus->mmio = devm_ioremap(&pdev->dev, pci_resource_start(pdev, 1),
+				    pci_resource_len(pdev, 1));
+	if (cirrus->mmio == NULL)
+		return -ENOMEM;
+
+	ret = cirrus_mode_config_init(cirrus);
+	if (ret)
+		return ret;
+
+	ret = cirrus_pipe_init(cirrus);
+	if (ret < 0)
+		return ret;
+
+	drm_mode_config_reset(dev);
+
+	pci_set_drvdata(pdev, dev);
+	ret = drm_dev_register(dev, 0);
+	if (ret)
+		return ret;
+
+	drm_fbdev_generic_setup(dev, 16);
+	return 0;
+}
+
+static void cirrus_pci_remove(struct pci_dev *pdev)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+
+	drm_dev_unplug(dev);
+	drm_atomic_helper_shutdown(dev);
+}
+
+static const struct pci_device_id pciidlist[] = {
+	{
+		.vendor    = PCI_VENDOR_ID_CIRRUS,
+		.device    = PCI_DEVICE_ID_CIRRUS_5446,
+		/* only bind to the cirrus chip in qemu */
+		.subvendor = PCI_SUBVENDOR_ID_REDHAT_QUMRANET,
+		.subdevice = PCI_SUBDEVICE_ID_QEMU,
+	}, {
+		.vendor    = PCI_VENDOR_ID_CIRRUS,
+		.device    = PCI_DEVICE_ID_CIRRUS_5446,
+		.subvendor = PCI_VENDOR_ID_XEN,
+		.subdevice = 0x0001,
+	},
+	{ /* end if list */ }
+};
+
+static struct pci_driver cirrus_pci_driver = {
+	.name = DRIVER_NAME,
+	.id_table = pciidlist,
+	.probe = cirrus_pci_probe,
+	.remove = cirrus_pci_remove,
+};
+
+drm_module_pci_driver(cirrus_pci_driver)
+
+MODULE_DEVICE_TABLE(pci, pciidlist);
+MODULE_LICENSE("GPL");
-- 
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