1// SPDX-License-Identifier: GPL-2.0-only
  2/**************************************************************************
  3 * Copyright (c) 2007-2011, Intel Corporation.
  4 * All Rights Reserved.
  5 *
  6 **************************************************************************/
  7
  8#include <linux/fb.h>
  9#include <linux/pfn_t.h>
 10
 11#include <drm/drm_crtc_helper.h>
 12#include <drm/drm_drv.h>
 13#include <drm/drm_fb_helper.h>
 14#include <drm/drm_framebuffer.h>
 15
 16#include "gem.h"
 17#include "psb_drv.h"
 18
 19/*
 20 * VM area struct
 21 */
 22
 23static vm_fault_t psb_fbdev_vm_fault(struct vm_fault *vmf)
 24{
 25	struct vm_area_struct *vma = vmf->vma;
 26	struct fb_info *info = vma->vm_private_data;
 27	unsigned long address = vmf->address - (vmf->pgoff << PAGE_SHIFT);
 28	unsigned long pfn = info->fix.smem_start >> PAGE_SHIFT;
 29	vm_fault_t err = VM_FAULT_SIGBUS;
 30	unsigned long page_num = vma_pages(vma);
 31	unsigned long i;
 32
 33	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 34
 35	for (i = 0; i < page_num; ++i) {
 36		err = vmf_insert_mixed(vma, address, __pfn_to_pfn_t(pfn, PFN_DEV));
 37		if (unlikely(err & VM_FAULT_ERROR))
 38			break;
 39		address += PAGE_SIZE;
 40		++pfn;
 41	}
 42
 43	return err;
 44}
 45
 46static const struct vm_operations_struct psb_fbdev_vm_ops = {
 47	.fault	= psb_fbdev_vm_fault,
 48};
 49
 50/*
 51 * struct fb_ops
 52 */
 53
 54#define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)
 55
 56static int psb_fbdev_fb_setcolreg(unsigned int regno,
 57				  unsigned int red, unsigned int green,
 58				  unsigned int blue, unsigned int transp,
 59				  struct fb_info *info)
 60{
 61	struct drm_fb_helper *fb_helper = info->par;
 62	struct drm_framebuffer *fb = fb_helper->fb;
 63	uint32_t v;
 64
 65	if (!fb)
 66		return -ENOMEM;
 67
 68	if (regno > 255)
 69		return 1;
 70
 71	red = CMAP_TOHW(red, info->var.red.length);
 72	blue = CMAP_TOHW(blue, info->var.blue.length);
 73	green = CMAP_TOHW(green, info->var.green.length);
 74	transp = CMAP_TOHW(transp, info->var.transp.length);
 75
 76	v = (red << info->var.red.offset) |
 77	    (green << info->var.green.offset) |
 78	    (blue << info->var.blue.offset) |
 79	    (transp << info->var.transp.offset);
 80
 81	if (regno < 16) {
 82		switch (fb->format->cpp[0] * 8) {
 83		case 16:
 84			((uint32_t *) info->pseudo_palette)[regno] = v;
 85			break;
 86		case 24:
 87		case 32:
 88			((uint32_t *) info->pseudo_palette)[regno] = v;
 89			break;
 90		}
 91	}
 92
 93	return 0;
 94}
 95
 96static int psb_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 97{
 98	if (vma->vm_pgoff != 0)
 99		return -EINVAL;
100	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
101		return -EINVAL;
102
103	/*
104	 * If this is a GEM object then info->screen_base is the virtual
105	 * kernel remapping of the object. FIXME: Review if this is
106	 * suitable for our mmap work
107	 */
108	vma->vm_ops = &psb_fbdev_vm_ops;
109	vma->vm_private_data = info;
110	vm_flags_set(vma, VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP);
111
112	return 0;
113}
114
115static void psb_fbdev_fb_destroy(struct fb_info *info)
116{
117	struct drm_fb_helper *fb_helper = info->par;
118	struct drm_framebuffer *fb = fb_helper->fb;
119	struct drm_gem_object *obj = fb->obj[0];
120
121	drm_fb_helper_fini(fb_helper);
122
123	drm_framebuffer_unregister_private(fb);
124	fb->obj[0] = NULL;
125	drm_framebuffer_cleanup(fb);
126	kfree(fb);
127
128	drm_gem_object_put(obj);
129
130	drm_client_release(&fb_helper->client);
131
132	drm_fb_helper_unprepare(fb_helper);
133	kfree(fb_helper);
134}
135
136static const struct fb_ops psb_fbdev_fb_ops = {
137	.owner = THIS_MODULE,
138	__FB_DEFAULT_IOMEM_OPS_RDWR,
139	DRM_FB_HELPER_DEFAULT_OPS,
140	.fb_setcolreg = psb_fbdev_fb_setcolreg,
141	__FB_DEFAULT_IOMEM_OPS_DRAW,
142	.fb_mmap = psb_fbdev_fb_mmap,
143	.fb_destroy = psb_fbdev_fb_destroy,
144};
145
146static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = {
147};
148
149/*
150 * struct drm_driver
151 */
152
153int psb_fbdev_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
154				 struct drm_fb_helper_surface_size *sizes)
155{
156	struct drm_device *dev = fb_helper->dev;
157	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
158	struct pci_dev *pdev = to_pci_dev(dev->dev);
159	struct fb_info *info;
160	struct drm_framebuffer *fb;
161	struct drm_mode_fb_cmd2 mode_cmd = { };
162	int size;
163	int ret;
164	struct psb_gem_object *backing;
165	struct drm_gem_object *obj;
166	u32 bpp, depth;
167
168	/* No 24-bit packed mode */
169	if (sizes->surface_bpp == 24) {
170		sizes->surface_bpp = 32;
171		sizes->surface_depth = 24;
172	}
173	bpp = sizes->surface_bpp;
174	depth = sizes->surface_depth;
175
176	/*
177	 * If the mode does not fit in 32 bit then switch to 16 bit to get
178	 * a console on full resolution. The X mode setting server will
179	 * allocate its own 32-bit GEM framebuffer.
180	 */
181	size = ALIGN(sizes->surface_width * DIV_ROUND_UP(bpp, 8), 64) *
182		     sizes->surface_height;
183	size = ALIGN(size, PAGE_SIZE);
184
185	if (size > dev_priv->vram_stolen_size) {
186		sizes->surface_bpp = 16;
187		sizes->surface_depth = 16;
188	}
189	bpp = sizes->surface_bpp;
190	depth = sizes->surface_depth;
191
192	mode_cmd.width = sizes->surface_width;
193	mode_cmd.height = sizes->surface_height;
194	mode_cmd.pitches[0] = ALIGN(mode_cmd.width * DIV_ROUND_UP(bpp, 8), 64);
195	mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);
196
197	size = mode_cmd.pitches[0] * mode_cmd.height;
198	size = ALIGN(size, PAGE_SIZE);
199
200	/* Allocate the framebuffer in the GTT with stolen page backing */
201	backing = psb_gem_create(dev, size, "fb", true, PAGE_SIZE);
202	if (IS_ERR(backing))
203		return PTR_ERR(backing);
204	obj = &backing->base;
205
206	fb = psb_framebuffer_create(dev, &mode_cmd, obj);
207	if (IS_ERR(fb)) {
208		ret = PTR_ERR(fb);
209		goto err_drm_gem_object_put;
210	}
211
212	fb_helper->funcs = &psb_fbdev_fb_helper_funcs;
213	fb_helper->fb = fb;
214
215	info = drm_fb_helper_alloc_info(fb_helper);
216	if (IS_ERR(info)) {
217		ret = PTR_ERR(info);
218		goto err_drm_framebuffer_unregister_private;
219	}
220
221	info->fbops = &psb_fbdev_fb_ops;
222
223	/* Accessed stolen memory directly */
224	info->screen_base = dev_priv->vram_addr + backing->offset;
225	info->screen_size = size;
226
227	drm_fb_helper_fill_info(info, fb_helper, sizes);
228
229	info->fix.smem_start = dev_priv->stolen_base + backing->offset;
230	info->fix.smem_len = size;
231	info->fix.ywrapstep = 0;
232	info->fix.ypanstep = 0;
233	info->fix.mmio_start = pci_resource_start(pdev, 0);
234	info->fix.mmio_len = pci_resource_len(pdev, 0);
235
236	fb_memset_io(info->screen_base, 0, info->screen_size);
237
238	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
239
240	dev_dbg(dev->dev, "allocated %dx%d fb\n", fb->width, fb->height);
241
242	return 0;
243
244err_drm_framebuffer_unregister_private:
245	drm_framebuffer_unregister_private(fb);
246	fb->obj[0] = NULL;
247	drm_framebuffer_cleanup(fb);
248	kfree(fb);
249err_drm_gem_object_put:
250	drm_gem_object_put(obj);
251	return ret;
252}