1/*
  2 * Copyright 2010 Matt Turner.
  3 * Copyright 2012 Red Hat
  4 *
  5 * This file is subject to the terms and conditions of the GNU General
  6 * Public License version 2. See the file COPYING in the main
  7 * directory of this archive for more details.
  8 *
  9 * Authors: Matthew Garrett
 10 *          Matt Turner
 11 *          Dave Airlie
 12 */
 13#include <drm/drmP.h>
 14#include <drm/drm_crtc_helper.h>
 15#include "mgag200_drv.h"
 16
 17static void mga_user_framebuffer_destroy(struct drm_framebuffer *fb)
 18{
 19	struct mga_framebuffer *mga_fb = to_mga_framebuffer(fb);
 20	if (mga_fb->obj)
 21		drm_gem_object_unreference_unlocked(mga_fb->obj);
 22	drm_framebuffer_cleanup(fb);
 23	kfree(fb);
 24}
 25
 26static const struct drm_framebuffer_funcs mga_fb_funcs = {
 27	.destroy = mga_user_framebuffer_destroy,
 28};
 29
 30int mgag200_framebuffer_init(struct drm_device *dev,
 31			     struct mga_framebuffer *gfb,
 32			     struct drm_mode_fb_cmd2 *mode_cmd,
 33			     struct drm_gem_object *obj)
 34{
 35	int ret;
 36	
 37	drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
 38	gfb->obj = obj;
 39	ret = drm_framebuffer_init(dev, &gfb->base, &mga_fb_funcs);
 40	if (ret) {
 41		DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
 42		return ret;
 43	}
 44	return 0;
 45}
 46
 47static struct drm_framebuffer *
 48mgag200_user_framebuffer_create(struct drm_device *dev,
 49				struct drm_file *filp,
 50				struct drm_mode_fb_cmd2 *mode_cmd)
 51{
 52	struct drm_gem_object *obj;
 53	struct mga_framebuffer *mga_fb;
 54	int ret;
 55
 56	obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
 57	if (obj == NULL)
 58		return ERR_PTR(-ENOENT);
 59
 60	mga_fb = kzalloc(sizeof(*mga_fb), GFP_KERNEL);
 61	if (!mga_fb) {
 62		drm_gem_object_unreference_unlocked(obj);
 63		return ERR_PTR(-ENOMEM);
 64	}
 65
 66	ret = mgag200_framebuffer_init(dev, mga_fb, mode_cmd, obj);
 67	if (ret) {
 68		drm_gem_object_unreference_unlocked(obj);
 69		kfree(mga_fb);
 70		return ERR_PTR(ret);
 71	}
 72	return &mga_fb->base;
 73}
 74
 75static const struct drm_mode_config_funcs mga_mode_funcs = {
 76	.fb_create = mgag200_user_framebuffer_create,
 77};
 78
 79static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
 80{
 81	int offset;
 82	int orig;
 83	int test1, test2;
 84	int orig1, orig2;
 85
 86	/* Probe */
 87	orig = ioread16(mem);
 88	iowrite16(0, mem);
 89
 90	for (offset = 0x100000; offset < mdev->mc.vram_window; offset += 0x4000) {
 91		orig1 = ioread8(mem + offset);
 92		orig2 = ioread8(mem + offset + 0x100);
 93
 94		iowrite16(0xaa55, mem + offset);
 95		iowrite16(0xaa55, mem + offset + 0x100);
 96
 97		test1 = ioread16(mem + offset);
 98		test2 = ioread16(mem);
 99
100		iowrite16(orig1, mem + offset);
101		iowrite16(orig2, mem + offset + 0x100);
102
103		if (test1 != 0xaa55) {
104			break;
105		}
106
107		if (test2) {
108			break;
109		}
110	}
111
112	iowrite16(orig, mem);
113	return offset - 65536;
114}
115
116/* Map the framebuffer from the card and configure the core */
117static int mga_vram_init(struct mga_device *mdev)
118{
119	void __iomem *mem;
120	struct apertures_struct *aper = alloc_apertures(1);
121	if (!aper)
122		return -ENOMEM;
123
124	/* BAR 0 is VRAM */
125	mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
126	mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);
127
128	aper->ranges[0].base = mdev->mc.vram_base;
129	aper->ranges[0].size = mdev->mc.vram_window;
130
131	remove_conflicting_framebuffers(aper, "mgafb", true);
132	kfree(aper);
133
134	if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
135				"mgadrmfb_vram")) {
136		DRM_ERROR("can't reserve VRAM\n");
137		return -ENXIO;
138	}
139
140	mem = pci_iomap(mdev->dev->pdev, 0, 0);
141
142	mdev->mc.vram_size = mga_probe_vram(mdev, mem);
143
144	pci_iounmap(mdev->dev->pdev, mem);
145
146	return 0;
147}
148
149static int mgag200_device_init(struct drm_device *dev,
150			       uint32_t flags)
151{
152	struct mga_device *mdev = dev->dev_private;
153	int ret, option;
154
155	mdev->type = flags;
156
157	/* Hardcode the number of CRTCs to 1 */
158	mdev->num_crtc = 1;
159
160	pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
161	mdev->has_sdram = !(option & (1 << 14));
162
163	/* BAR 0 is the framebuffer, BAR 1 contains registers */
164	mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
165	mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);
166
167	if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
168				"mgadrmfb_mmio")) {
169		DRM_ERROR("can't reserve mmio registers\n");
170		return -ENOMEM;
171	}
172
173	mdev->rmmio = pcim_iomap(dev->pdev, 1, 0);
174	if (mdev->rmmio == NULL)
175		return -ENOMEM;
176
177	/* stash G200 SE model number for later use */
178	if (IS_G200_SE(mdev))
179		mdev->unique_rev_id = RREG32(0x1e24);
180
181	ret = mga_vram_init(mdev);
182	if (ret)
183		return ret;
184
185	mdev->bpp_shifts[0] = 0;
186	mdev->bpp_shifts[1] = 1;
187	mdev->bpp_shifts[2] = 0;
188	mdev->bpp_shifts[3] = 2;
189	return 0;
190}
191
192/*
193 * Functions here will be called by the core once it's bound the driver to
194 * a PCI device
195 */
196
197
198int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
199{
200	struct mga_device *mdev;
201	int r;
202
203	mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
204	if (mdev == NULL)
205		return -ENOMEM;
206	dev->dev_private = (void *)mdev;
207	mdev->dev = dev;
208
209	r = mgag200_device_init(dev, flags);
210	if (r) {
211		dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
212		return r;
213	}
214	r = mgag200_mm_init(mdev);
215	if (r)
216		goto out;
217
218	drm_mode_config_init(dev);
219	dev->mode_config.funcs = (void *)&mga_mode_funcs;
220	if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
221		dev->mode_config.preferred_depth = 16;
222	else
223		dev->mode_config.preferred_depth = 24;
224	dev->mode_config.prefer_shadow = 1;
225
226	r = mgag200_modeset_init(mdev);
227	if (r) {
228		dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
229		goto out;
230	}
231
232	/* Make small buffers to store a hardware cursor (double buffered icon updates) */
233	mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
234					  &mdev->cursor.pixels_1);
235	mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
236					  &mdev->cursor.pixels_2);
237	if (!mdev->cursor.pixels_2 || !mdev->cursor.pixels_1)
238		goto cursor_nospace;
239	mdev->cursor.pixels_current = mdev->cursor.pixels_1;
240	mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
241	goto cursor_done;
242 cursor_nospace:
243	mdev->cursor.pixels_1 = NULL;
244	mdev->cursor.pixels_2 = NULL;
245	dev_warn(&dev->pdev->dev, "Could not allocate space for cursors. Not doing hardware cursors.\n");
246 cursor_done:
247
248out:
249	if (r)
250		mgag200_driver_unload(dev);
251	return r;
252}
253
254int mgag200_driver_unload(struct drm_device *dev)
255{
256	struct mga_device *mdev = dev->dev_private;
257
258	if (mdev == NULL)
259		return 0;
260	mgag200_modeset_fini(mdev);
261	mgag200_fbdev_fini(mdev);
262	drm_mode_config_cleanup(dev);
263	mgag200_mm_fini(mdev);
264	dev->dev_private = NULL;
265	return 0;
266}
267
268int mgag200_gem_create(struct drm_device *dev,
269		   u32 size, bool iskernel,
270		   struct drm_gem_object **obj)
271{
272	struct mgag200_bo *astbo;
273	int ret;
274
275	*obj = NULL;
276
277	size = roundup(size, PAGE_SIZE);
278	if (size == 0)
279		return -EINVAL;
280
281	ret = mgag200_bo_create(dev, size, 0, 0, &astbo);
282	if (ret) {
283		if (ret != -ERESTARTSYS)
284			DRM_ERROR("failed to allocate GEM object\n");
285		return ret;
286	}
287	*obj = &astbo->gem;
288	return 0;
289}
290
291int mgag200_dumb_create(struct drm_file *file,
292		    struct drm_device *dev,
293		    struct drm_mode_create_dumb *args)
294{
295	int ret;
296	struct drm_gem_object *gobj;
297	u32 handle;
298
299	args->pitch = args->width * ((args->bpp + 7) / 8);
300	args->size = args->pitch * args->height;
301
302	ret = mgag200_gem_create(dev, args->size, false,
303			     &gobj);
304	if (ret)
305		return ret;
306
307	ret = drm_gem_handle_create(file, gobj, &handle);
308	drm_gem_object_unreference_unlocked(gobj);
309	if (ret)
310		return ret;
311
312	args->handle = handle;
313	return 0;
314}
315
316static void mgag200_bo_unref(struct mgag200_bo **bo)
317{
318	struct ttm_buffer_object *tbo;
319
320	if ((*bo) == NULL)
321		return;
322
323	tbo = &((*bo)->bo);
324	ttm_bo_unref(&tbo);
325	if (tbo == NULL)
326		*bo = NULL;
327
328}
329
330void mgag200_gem_free_object(struct drm_gem_object *obj)
331{
332	struct mgag200_bo *mgag200_bo = gem_to_mga_bo(obj);
333
334	if (!mgag200_bo)
335		return;
336	mgag200_bo_unref(&mgag200_bo);
337}
338
339
340static inline u64 mgag200_bo_mmap_offset(struct mgag200_bo *bo)
341{
342	return drm_vma_node_offset_addr(&bo->bo.vma_node);
343}
344
345int
346mgag200_dumb_mmap_offset(struct drm_file *file,
347		     struct drm_device *dev,
348		     uint32_t handle,
349		     uint64_t *offset)
350{
351	struct drm_gem_object *obj;
352	int ret;
353	struct mgag200_bo *bo;
354
355	mutex_lock(&dev->struct_mutex);
356	obj = drm_gem_object_lookup(dev, file, handle);
357	if (obj == NULL) {
358		ret = -ENOENT;
359		goto out_unlock;
360	}
361
362	bo = gem_to_mga_bo(obj);
363	*offset = mgag200_bo_mmap_offset(bo);
364
365	drm_gem_object_unreference(obj);
366	ret = 0;
367out_unlock:
368	mutex_unlock(&dev->struct_mutex);
369	return ret;
370
371}