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c40fae95 TL |
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 | ||
0dc5e77c TL |
24 | #include <linux/module.h> |
25 | #include <linux/kernel.h> | |
27ac792c | 26 | #include <linux/mm.h> |
0dc5e77c TL |
27 | #include <linux/init.h> |
28 | #include <linux/platform_device.h> | |
98864ff5 | 29 | #include <linux/memblock.h> |
fced80c7 | 30 | #include <linux/io.h> |
91773a00 | 31 | #include <linux/omapfb.h> |
0dc5e77c | 32 | |
a09e64fb | 33 | #include <mach/hardware.h> |
0dc5e77c TL |
34 | #include <asm/mach/map.h> |
35 | ||
ce491cf8 TL |
36 | #include <plat/board.h> |
37 | #include <plat/sram.h> | |
0dc5e77c TL |
38 | |
39 | #if defined(CONFIG_FB_OMAP) || defined(CONFIG_FB_OMAP_MODULE) | |
40 | ||
41 | static struct omapfb_platform_data omapfb_config; | |
b7cc6d46 ID |
42 | static int config_invalid; |
43 | static int configured_regions; | |
0dc5e77c TL |
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 | ||
b39a982d TV |
58 | void omapfb_set_platform_data(struct omapfb_platform_data *data) |
59 | { | |
60 | } | |
61 | ||
b7cc6d46 ID |
62 | static inline int ranges_overlap(unsigned long start1, unsigned long size1, |
63 | unsigned long start2, unsigned long size2) | |
0dc5e77c | 64 | { |
b7cc6d46 ID |
65 | return (start1 >= start2 && start1 < start2 + size2) || |
66 | (start2 >= start1 && start2 < start1 + size1); | |
67 | } | |
68 | ||
69 | static inline int range_included(unsigned long start1, unsigned long size1, | |
70 | unsigned long start2, unsigned long size2) | |
71 | { | |
72 | return start1 >= start2 && start1 + size1 <= start2 + size2; | |
73 | } | |
74 | ||
75 | ||
76 | /* Check if there is an overlapping region. */ | |
77 | static int fbmem_region_reserved(unsigned long start, size_t size) | |
78 | { | |
79 | struct omapfb_mem_region *rg; | |
c40fae95 TL |
80 | int i; |
81 | ||
b7cc6d46 ID |
82 | rg = &omapfb_config.mem_desc.region[0]; |
83 | for (i = 0; i < OMAPFB_PLANE_NUM; i++, rg++) { | |
84 | if (!rg->paddr) | |
85 | /* Empty slot. */ | |
86 | continue; | |
87 | if (ranges_overlap(start, size, rg->paddr, rg->size)) | |
88 | return 1; | |
c40fae95 | 89 | } |
b7cc6d46 ID |
90 | return 0; |
91 | } | |
c40fae95 | 92 | |
b7cc6d46 ID |
93 | /* |
94 | * Get the region_idx`th region from board config/ATAG and convert it to | |
95 | * our internal format. | |
96 | */ | |
97 | static int get_fbmem_region(int region_idx, struct omapfb_mem_region *rg) | |
98 | { | |
99 | const struct omap_fbmem_config *conf; | |
100 | u32 paddr; | |
0dc5e77c | 101 | |
b7cc6d46 ID |
102 | conf = omap_get_nr_config(OMAP_TAG_FBMEM, |
103 | struct omap_fbmem_config, region_idx); | |
104 | if (conf == NULL) | |
105 | return -ENOENT; | |
106 | ||
107 | paddr = conf->start; | |
108 | /* | |
109 | * Low bits encode the page allocation mode, if high bits | |
110 | * are zero. Otherwise we need a page aligned fixed | |
111 | * address. | |
112 | */ | |
113 | memset(rg, 0, sizeof(*rg)); | |
114 | rg->type = paddr & ~PAGE_MASK; | |
115 | rg->paddr = paddr & PAGE_MASK; | |
116 | rg->size = PAGE_ALIGN(conf->size); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | static int set_fbmem_region_type(struct omapfb_mem_region *rg, int mem_type, | |
121 | unsigned long mem_start, | |
122 | unsigned long mem_size) | |
123 | { | |
124 | /* | |
125 | * Check if the configuration specifies the type explicitly. | |
126 | * type = 0 && paddr = 0, a default don't care case maps to | |
127 | * the SDRAM type. | |
128 | */ | |
129 | if (rg->type || (!rg->type && !rg->paddr)) | |
130 | return 0; | |
131 | if (ranges_overlap(rg->paddr, rg->size, mem_start, mem_size)) { | |
132 | rg->type = mem_type; | |
133 | return 0; | |
134 | } | |
135 | /* Can't determine it. */ | |
136 | return -1; | |
137 | } | |
138 | ||
139 | static int check_fbmem_region(int region_idx, struct omapfb_mem_region *rg, | |
140 | unsigned long start_avail, unsigned size_avail) | |
141 | { | |
142 | unsigned long paddr = rg->paddr; | |
143 | size_t size = rg->size; | |
144 | ||
145 | if (rg->type > OMAPFB_MEMTYPE_MAX) { | |
146 | printk(KERN_ERR | |
147 | "Invalid start address for FB region %d\n", region_idx); | |
148 | return -EINVAL; | |
149 | } | |
150 | ||
151 | if (!rg->size) { | |
152 | printk(KERN_ERR "Zero size for FB region %d\n", region_idx); | |
153 | return -EINVAL; | |
154 | } | |
155 | ||
156 | if (!paddr) | |
157 | /* Allocate this dynamically, leave paddr 0 for now. */ | |
158 | return 0; | |
159 | ||
160 | /* | |
161 | * Fixed region for the given RAM range. Check if it's already | |
162 | * reserved by the FB code or someone else. | |
163 | */ | |
164 | if (fbmem_region_reserved(paddr, size) || | |
165 | !range_included(paddr, size, start_avail, size_avail)) { | |
166 | printk(KERN_ERR "Trying to use reserved memory " | |
167 | "for FB region %d\n", region_idx); | |
168 | return -EINVAL; | |
169 | } | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
a1af0fbb RK |
174 | static int valid_sdram(unsigned long addr, unsigned long size) |
175 | { | |
e3239ff9 | 176 | struct memblock_region res; |
a1af0fbb | 177 | |
98864ff5 RK |
178 | res.base = addr; |
179 | res.size = size; | |
180 | return !memblock_find(&res) && res.base == addr && res.size == size; | |
a1af0fbb RK |
181 | } |
182 | ||
183 | static int reserve_sdram(unsigned long addr, unsigned long size) | |
184 | { | |
98864ff5 RK |
185 | if (memblock_is_region_reserved(addr, size)) |
186 | return -EBUSY; | |
187 | if (memblock_reserve(addr, size)) | |
188 | return -ENOMEM; | |
189 | return 0; | |
a1af0fbb RK |
190 | } |
191 | ||
b7cc6d46 ID |
192 | /* |
193 | * Called from map_io. We need to call to this early enough so that we | |
194 | * can reserve the fixed SDRAM regions before VM could get hold of them. | |
195 | */ | |
98864ff5 | 196 | void __init omapfb_reserve_sdram_memblock(void) |
b7cc6d46 | 197 | { |
a1af0fbb RK |
198 | unsigned long reserved = 0; |
199 | int i; | |
b7cc6d46 ID |
200 | |
201 | if (config_invalid) | |
202 | return; | |
203 | ||
b7cc6d46 | 204 | for (i = 0; ; i++) { |
a1af0fbb | 205 | struct omapfb_mem_region rg; |
b7cc6d46 ID |
206 | |
207 | if (get_fbmem_region(i, &rg) < 0) | |
c40fae95 | 208 | break; |
a1af0fbb | 209 | |
b7cc6d46 | 210 | if (i == OMAPFB_PLANE_NUM) { |
a1af0fbb | 211 | pr_err("Extraneous FB mem configuration entries\n"); |
b7cc6d46 ID |
212 | config_invalid = 1; |
213 | return; | |
0dc5e77c | 214 | } |
a1af0fbb | 215 | |
b7cc6d46 | 216 | /* Check if it's our memory type. */ |
a1af0fbb RK |
217 | if (rg.type != OMAPFB_MEMTYPE_SDRAM) |
218 | continue; | |
219 | ||
220 | /* Check if the region falls within SDRAM */ | |
221 | if (rg.paddr && !valid_sdram(rg.paddr, rg.size)) | |
b7cc6d46 | 222 | continue; |
a1af0fbb RK |
223 | |
224 | if (rg.size == 0) { | |
225 | pr_err("Zero size for FB region %d\n", i); | |
b7cc6d46 ID |
226 | config_invalid = 1; |
227 | return; | |
c40fae95 | 228 | } |
a1af0fbb | 229 | |
72af2b36 | 230 | if (rg.paddr) { |
a1af0fbb RK |
231 | if (reserve_sdram(rg.paddr, rg.size)) { |
232 | pr_err("Trying to use reserved memory for FB region %d\n", | |
233 | i); | |
234 | config_invalid = 1; | |
235 | return; | |
236 | } | |
72af2b36 TV |
237 | reserved += rg.size; |
238 | } | |
a1af0fbb RK |
239 | |
240 | if (omapfb_config.mem_desc.region[i].size) { | |
241 | pr_err("FB region %d already set\n", i); | |
242 | config_invalid = 1; | |
243 | return; | |
244 | } | |
245 | ||
b7cc6d46 ID |
246 | omapfb_config.mem_desc.region[i] = rg; |
247 | configured_regions++; | |
0dc5e77c | 248 | } |
c40fae95 | 249 | omapfb_config.mem_desc.region_cnt = i; |
b7cc6d46 | 250 | if (reserved) |
c40fae95 | 251 | pr_info("Reserving %lu bytes SDRAM for frame buffer\n", |
b7cc6d46 ID |
252 | reserved); |
253 | } | |
254 | ||
255 | /* | |
256 | * Called at sram init time, before anything is pushed to the SRAM stack. | |
257 | * Because of the stack scheme, we will allocate everything from the | |
258 | * start of the lowest address region to the end of SRAM. This will also | |
259 | * include padding for page alignment and possible holes between regions. | |
260 | * | |
261 | * As opposed to the SDRAM case, we'll also do any dynamic allocations at | |
262 | * this point, since the driver built as a module would have problem with | |
263 | * freeing / reallocating the regions. | |
264 | */ | |
265 | unsigned long omapfb_reserve_sram(unsigned long sram_pstart, | |
266 | unsigned long sram_vstart, | |
267 | unsigned long sram_size, | |
268 | unsigned long pstart_avail, | |
269 | unsigned long size_avail) | |
270 | { | |
271 | struct omapfb_mem_region rg; | |
272 | unsigned long pend_avail; | |
273 | unsigned long reserved; | |
274 | int i; | |
275 | ||
276 | if (config_invalid) | |
277 | return 0; | |
278 | ||
279 | reserved = 0; | |
280 | pend_avail = pstart_avail + size_avail; | |
281 | for (i = 0; ; i++) { | |
282 | if (get_fbmem_region(i, &rg) < 0) | |
283 | break; | |
284 | if (i == OMAPFB_PLANE_NUM) { | |
285 | printk(KERN_ERR | |
286 | "Extraneous FB mem configuration entries\n"); | |
287 | config_invalid = 1; | |
288 | return 0; | |
289 | } | |
c40fae95 | 290 | |
b7cc6d46 ID |
291 | /* Check if it's our memory type. */ |
292 | if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SRAM, | |
293 | sram_pstart, sram_size) < 0 || | |
294 | (rg.type != OMAPFB_MEMTYPE_SRAM)) | |
295 | continue; | |
296 | BUG_ON(omapfb_config.mem_desc.region[i].size); | |
297 | ||
298 | if (check_fbmem_region(i, &rg, pstart_avail, size_avail) < 0) { | |
299 | config_invalid = 1; | |
300 | return 0; | |
301 | } | |
302 | ||
303 | if (!rg.paddr) { | |
304 | /* Dynamic allocation */ | |
305 | if ((size_avail & PAGE_MASK) < rg.size) { | |
306 | printk("Not enough SRAM for FB region %d\n", | |
307 | i); | |
308 | config_invalid = 1; | |
309 | return 0; | |
310 | } | |
311 | size_avail = (size_avail - rg.size) & PAGE_MASK; | |
312 | rg.paddr = pstart_avail + size_avail; | |
313 | } | |
314 | /* Reserve everything above the start of the region. */ | |
315 | if (pend_avail - rg.paddr > reserved) | |
316 | reserved = pend_avail - rg.paddr; | |
317 | size_avail = pend_avail - reserved - pstart_avail; | |
318 | ||
319 | /* | |
320 | * We have a kernel mapping for this already, so the | |
321 | * driver won't have to make one. | |
322 | */ | |
323 | rg.vaddr = (void *)(sram_vstart + rg.paddr - sram_pstart); | |
324 | omapfb_config.mem_desc.region[i] = rg; | |
325 | configured_regions++; | |
326 | } | |
327 | omapfb_config.mem_desc.region_cnt = i; | |
328 | if (reserved) | |
329 | pr_info("Reserving %lu bytes SRAM for frame buffer\n", | |
330 | reserved); | |
331 | return reserved; | |
0dc5e77c TL |
332 | } |
333 | ||
771af222 ID |
334 | void omapfb_set_ctrl_platform_data(void *data) |
335 | { | |
336 | omapfb_config.ctrl_platform_data = data; | |
337 | } | |
338 | ||
0dc5e77c TL |
339 | static inline int omap_init_fb(void) |
340 | { | |
341 | const struct omap_lcd_config *conf; | |
342 | ||
b7cc6d46 ID |
343 | if (config_invalid) |
344 | return 0; | |
345 | if (configured_regions != omapfb_config.mem_desc.region_cnt) { | |
346 | printk(KERN_ERR "Invalid FB mem configuration entries\n"); | |
347 | return 0; | |
348 | } | |
0dc5e77c | 349 | conf = omap_get_config(OMAP_TAG_LCD, struct omap_lcd_config); |
b7cc6d46 ID |
350 | if (conf == NULL) { |
351 | if (configured_regions) | |
352 | /* FB mem config, but no LCD config? */ | |
353 | printk(KERN_ERR "Missing LCD configuration\n"); | |
0dc5e77c | 354 | return 0; |
b7cc6d46 | 355 | } |
0dc5e77c TL |
356 | omapfb_config.lcd = *conf; |
357 | ||
358 | return platform_device_register(&omap_fb_device); | |
359 | } | |
360 | ||
361 | arch_initcall(omap_init_fb); | |
362 | ||
b39a982d TV |
363 | #elif defined(CONFIG_FB_OMAP2) || defined(CONFIG_FB_OMAP2_MODULE) |
364 | ||
365 | static u64 omap_fb_dma_mask = ~(u32)0; | |
366 | static struct omapfb_platform_data omapfb_config; | |
367 | ||
368 | static struct platform_device omap_fb_device = { | |
369 | .name = "omapfb", | |
370 | .id = -1, | |
371 | .dev = { | |
372 | .dma_mask = &omap_fb_dma_mask, | |
373 | .coherent_dma_mask = ~(u32)0, | |
374 | .platform_data = &omapfb_config, | |
375 | }, | |
376 | .num_resources = 0, | |
377 | }; | |
378 | ||
379 | void omapfb_set_platform_data(struct omapfb_platform_data *data) | |
380 | { | |
381 | omapfb_config = *data; | |
382 | } | |
383 | ||
384 | static inline int omap_init_fb(void) | |
385 | { | |
386 | return platform_device_register(&omap_fb_device); | |
387 | } | |
388 | ||
389 | arch_initcall(omap_init_fb); | |
0dc5e77c | 390 | |
98864ff5 RK |
391 | void omapfb_reserve_sdram_memblock(void) |
392 | { | |
393 | } | |
394 | ||
b7cc6d46 ID |
395 | unsigned long omapfb_reserve_sram(unsigned long sram_pstart, |
396 | unsigned long sram_vstart, | |
397 | unsigned long sram_size, | |
398 | unsigned long start_avail, | |
cc150b03 DB |
399 | unsigned long size_avail) |
400 | { | |
401 | return 0; | |
402 | } | |
b7cc6d46 | 403 | |
b39a982d TV |
404 | #else |
405 | ||
406 | void omapfb_set_platform_data(struct omapfb_platform_data *data) | |
407 | { | |
408 | } | |
409 | ||
98864ff5 RK |
410 | void omapfb_reserve_sdram_memblock(void) |
411 | { | |
412 | } | |
413 | ||
b39a982d TV |
414 | unsigned long omapfb_reserve_sram(unsigned long sram_pstart, |
415 | unsigned long sram_vstart, | |
416 | unsigned long sram_size, | |
417 | unsigned long start_avail, | |
418 | unsigned long size_avail) | |
419 | { | |
420 | return 0; | |
421 | } | |
0dc5e77c TL |
422 | |
423 | #endif |