Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[linux-2.6] / arch / arm / plat-omap / fb.c
1 /*
2  * File: arch/arm/plat-omap/fb.c
3  *
4  * Framebuffer device registration for TI OMAP platforms
5  *
6  * Copyright (C) 2006 Nokia Corporation
7  * Author: Imre Deak <imre.deak@nokia.com>
8  *
9  * This program is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU General Public License as published by the
11  * Free Software Foundation; either version 2 of the License, or (at your
12  * option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License along
20  * with this program; if not, write to the Free Software Foundation, Inc.,
21  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
22  */
23
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/mm.h>
27 #include <linux/init.h>
28 #include <linux/platform_device.h>
29 #include <linux/bootmem.h>
30 #include <linux/io.h>
31
32 #include <mach/hardware.h>
33 #include <asm/mach/map.h>
34
35 #include <mach/board.h>
36 #include <mach/sram.h>
37 #include <mach/omapfb.h>
38
39 #if defined(CONFIG_FB_OMAP) || defined(CONFIG_FB_OMAP_MODULE)
40
41 static struct omapfb_platform_data omapfb_config;
42 static int config_invalid;
43 static int configured_regions;
44
45 static u64 omap_fb_dma_mask = ~(u32)0;
46
47 static struct platform_device omap_fb_device = {
48         .name           = "omapfb",
49         .id             = -1,
50         .dev = {
51                 .dma_mask               = &omap_fb_dma_mask,
52                 .coherent_dma_mask      = ~(u32)0,
53                 .platform_data          = &omapfb_config,
54         },
55         .num_resources = 0,
56 };
57
58 static inline int ranges_overlap(unsigned long start1, unsigned long size1,
59                                  unsigned long start2, unsigned long size2)
60 {
61         return (start1 >= start2 && start1 < start2 + size2) ||
62                (start2 >= start1 && start2 < start1 + size1);
63 }
64
65 static inline int range_included(unsigned long start1, unsigned long size1,
66                                  unsigned long start2, unsigned long size2)
67 {
68         return start1 >= start2 && start1 + size1 <= start2 + size2;
69 }
70
71
72 /* Check if there is an overlapping region. */
73 static int fbmem_region_reserved(unsigned long start, size_t size)
74 {
75         struct omapfb_mem_region *rg;
76         int i;
77
78         rg = &omapfb_config.mem_desc.region[0];
79         for (i = 0; i < OMAPFB_PLANE_NUM; i++, rg++) {
80                 if (!rg->paddr)
81                         /* Empty slot. */
82                         continue;
83                 if (ranges_overlap(start, size, rg->paddr, rg->size))
84                         return 1;
85         }
86         return 0;
87 }
88
89 /*
90  * Get the region_idx`th region from board config/ATAG and convert it to
91  * our internal format.
92  */
93 static int get_fbmem_region(int region_idx, struct omapfb_mem_region *rg)
94 {
95         const struct omap_fbmem_config  *conf;
96         u32                             paddr;
97
98         conf = omap_get_nr_config(OMAP_TAG_FBMEM,
99                                   struct omap_fbmem_config, region_idx);
100         if (conf == NULL)
101                 return -ENOENT;
102
103         paddr = conf->start;
104         /*
105          * Low bits encode the page allocation mode, if high bits
106          * are zero. Otherwise we need a page aligned fixed
107          * address.
108          */
109         memset(rg, 0, sizeof(*rg));
110         rg->type = paddr & ~PAGE_MASK;
111         rg->paddr = paddr & PAGE_MASK;
112         rg->size = PAGE_ALIGN(conf->size);
113         return 0;
114 }
115
116 static int set_fbmem_region_type(struct omapfb_mem_region *rg, int mem_type,
117                                   unsigned long mem_start,
118                                   unsigned long mem_size)
119 {
120         /*
121          * Check if the configuration specifies the type explicitly.
122          * type = 0 && paddr = 0, a default don't care case maps to
123          * the SDRAM type.
124          */
125         if (rg->type || (!rg->type && !rg->paddr))
126                 return 0;
127         if (ranges_overlap(rg->paddr, rg->size, mem_start, mem_size)) {
128                 rg->type = mem_type;
129                 return 0;
130         }
131         /* Can't determine it. */
132         return -1;
133 }
134
135 static int check_fbmem_region(int region_idx, struct omapfb_mem_region *rg,
136                               unsigned long start_avail, unsigned size_avail)
137 {
138         unsigned long   paddr = rg->paddr;
139         size_t          size = rg->size;
140
141         if (rg->type > OMAPFB_MEMTYPE_MAX) {
142                 printk(KERN_ERR
143                         "Invalid start address for FB region %d\n", region_idx);
144                 return -EINVAL;
145         }
146
147         if (!rg->size) {
148                 printk(KERN_ERR "Zero size for FB region %d\n", region_idx);
149                 return -EINVAL;
150         }
151
152         if (!paddr)
153                 /* Allocate this dynamically, leave paddr 0 for now. */
154                 return 0;
155
156         /*
157          * Fixed region for the given RAM range. Check if it's already
158          * reserved by the FB code or someone else.
159          */
160         if (fbmem_region_reserved(paddr, size) ||
161             !range_included(paddr, size, start_avail, size_avail)) {
162                 printk(KERN_ERR "Trying to use reserved memory "
163                         "for FB region %d\n", region_idx);
164                 return -EINVAL;
165         }
166
167         return 0;
168 }
169
170 /*
171  * Called from map_io. We need to call to this early enough so that we
172  * can reserve the fixed SDRAM regions before VM could get hold of them.
173  */
174 void __init omapfb_reserve_sdram(void)
175 {
176         struct bootmem_data     *bdata;
177         unsigned long           sdram_start, sdram_size;
178         unsigned long           reserved;
179         int                     i;
180
181         if (config_invalid)
182                 return;
183
184         bdata = NODE_DATA(0)->bdata;
185         sdram_start = bdata->node_min_pfn << PAGE_SHIFT;
186         sdram_size = (bdata->node_low_pfn << PAGE_SHIFT) - sdram_start;
187         reserved = 0;
188         for (i = 0; ; i++) {
189                 struct omapfb_mem_region        rg;
190
191                 if (get_fbmem_region(i, &rg) < 0)
192                         break;
193                 if (i == OMAPFB_PLANE_NUM) {
194                         printk(KERN_ERR
195                                 "Extraneous FB mem configuration entries\n");
196                         config_invalid = 1;
197                         return;
198                 }
199                 /* Check if it's our memory type. */
200                 if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SDRAM,
201                                           sdram_start, sdram_size) < 0 ||
202                     (rg.type != OMAPFB_MEMTYPE_SDRAM))
203                         continue;
204                 BUG_ON(omapfb_config.mem_desc.region[i].size);
205                 if (check_fbmem_region(i, &rg, sdram_start, sdram_size) < 0) {
206                         config_invalid = 1;
207                         return;
208                 }
209                 if (rg.paddr)
210                         reserve_bootmem(rg.paddr, rg.size, BOOTMEM_DEFAULT);
211                 reserved += rg.size;
212                 omapfb_config.mem_desc.region[i] = rg;
213                 configured_regions++;
214         }
215         omapfb_config.mem_desc.region_cnt = i;
216         if (reserved)
217                 pr_info("Reserving %lu bytes SDRAM for frame buffer\n",
218                          reserved);
219 }
220
221 /*
222  * Called at sram init time, before anything is pushed to the SRAM stack.
223  * Because of the stack scheme, we will allocate everything from the
224  * start of the lowest address region to the end of SRAM. This will also
225  * include padding for page alignment and possible holes between regions.
226  *
227  * As opposed to the SDRAM case, we'll also do any dynamic allocations at
228  * this point, since the driver built as a module would have problem with
229  * freeing / reallocating the regions.
230  */
231 unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
232                                   unsigned long sram_vstart,
233                                   unsigned long sram_size,
234                                   unsigned long pstart_avail,
235                                   unsigned long size_avail)
236 {
237         struct omapfb_mem_region        rg;
238         unsigned long                   pend_avail;
239         unsigned long                   reserved;
240         int                             i;
241
242         if (config_invalid)
243                 return 0;
244
245         reserved = 0;
246         pend_avail = pstart_avail + size_avail;
247         for (i = 0; ; i++) {
248                 if (get_fbmem_region(i, &rg) < 0)
249                         break;
250                 if (i == OMAPFB_PLANE_NUM) {
251                         printk(KERN_ERR
252                                 "Extraneous FB mem configuration entries\n");
253                         config_invalid = 1;
254                         return 0;
255                 }
256
257                 /* Check if it's our memory type. */
258                 if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SRAM,
259                                           sram_pstart, sram_size) < 0 ||
260                     (rg.type != OMAPFB_MEMTYPE_SRAM))
261                         continue;
262                 BUG_ON(omapfb_config.mem_desc.region[i].size);
263
264                 if (check_fbmem_region(i, &rg, pstart_avail, size_avail) < 0) {
265                         config_invalid = 1;
266                         return 0;
267                 }
268
269                 if (!rg.paddr) {
270                         /* Dynamic allocation */
271                         if ((size_avail & PAGE_MASK) < rg.size) {
272                                 printk("Not enough SRAM for FB region %d\n",
273                                         i);
274                                 config_invalid = 1;
275                                 return 0;
276                         }
277                         size_avail = (size_avail - rg.size) & PAGE_MASK;
278                         rg.paddr = pstart_avail + size_avail;
279                 }
280                 /* Reserve everything above the start of the region. */
281                 if (pend_avail - rg.paddr > reserved)
282                         reserved = pend_avail - rg.paddr;
283                 size_avail = pend_avail - reserved - pstart_avail;
284
285                 /*
286                  * We have a kernel mapping for this already, so the
287                  * driver won't have to make one.
288                  */
289                 rg.vaddr = (void *)(sram_vstart + rg.paddr - sram_pstart);
290                 omapfb_config.mem_desc.region[i] = rg;
291                 configured_regions++;
292         }
293         omapfb_config.mem_desc.region_cnt = i;
294         if (reserved)
295                 pr_info("Reserving %lu bytes SRAM for frame buffer\n",
296                          reserved);
297         return reserved;
298 }
299
300 void omapfb_set_ctrl_platform_data(void *data)
301 {
302         omapfb_config.ctrl_platform_data = data;
303 }
304
305 static inline int omap_init_fb(void)
306 {
307         const struct omap_lcd_config *conf;
308
309         if (config_invalid)
310                 return 0;
311         if (configured_regions != omapfb_config.mem_desc.region_cnt) {
312                 printk(KERN_ERR "Invalid FB mem configuration entries\n");
313                 return 0;
314         }
315         conf = omap_get_config(OMAP_TAG_LCD, struct omap_lcd_config);
316         if (conf == NULL) {
317                 if (configured_regions)
318                         /* FB mem config, but no LCD config? */
319                         printk(KERN_ERR "Missing LCD configuration\n");
320                 return 0;
321         }
322         omapfb_config.lcd = *conf;
323
324         return platform_device_register(&omap_fb_device);
325 }
326
327 arch_initcall(omap_init_fb);
328
329 #else
330
331 void omapfb_reserve_sdram(void) {}
332 unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
333                                   unsigned long sram_vstart,
334                                   unsigned long sram_size,
335                                   unsigned long start_avail,
336                                   unsigned long size_avail)
337 {
338         return 0;
339 }
340
341
342 #endif