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 */
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/memblock.h>
30 #include <linux/io.h>
31 #include <linux/omapfb.h>
33 #include <mach/hardware.h>
34 #include <asm/mach/map.h>
36 #include <plat/board.h>
37 #include <plat/sram.h>
39 #include "fb.h"
41 #if defined(CONFIG_FB_OMAP) || defined(CONFIG_FB_OMAP_MODULE)
43 static struct omapfb_platform_data omapfb_config;
44 static int config_invalid;
45 static int configured_regions;
47 static u64 omap_fb_dma_mask = ~(u32)0;
49 static struct platform_device omap_fb_device = {
50 .name = "omapfb",
51 .id = -1,
52 .dev = {
53 .dma_mask = &omap_fb_dma_mask,
54 .coherent_dma_mask = ~(u32)0,
55 .platform_data = &omapfb_config,
56 },
57 .num_resources = 0,
58 };
60 void omapfb_set_platform_data(struct omapfb_platform_data *data)
61 {
62 }
64 static inline int ranges_overlap(unsigned long start1, unsigned long size1,
65 unsigned long start2, unsigned long size2)
66 {
67 return (start1 >= start2 && start1 < start2 + size2) ||
68 (start2 >= start1 && start2 < start1 + size1);
69 }
71 static inline int range_included(unsigned long start1, unsigned long size1,
72 unsigned long start2, unsigned long size2)
73 {
74 return start1 >= start2 && start1 + size1 <= start2 + size2;
75 }
78 /* Check if there is an overlapping region. */
79 static int fbmem_region_reserved(unsigned long start, size_t size)
80 {
81 struct omapfb_mem_region *rg;
82 int i;
84 rg = &omapfb_config.mem_desc.region[0];
85 for (i = 0; i < OMAPFB_PLANE_NUM; i++, rg++) {
86 if (!rg->paddr)
87 /* Empty slot. */
88 continue;
89 if (ranges_overlap(start, size, rg->paddr, rg->size))
90 return 1;
91 }
92 return 0;
93 }
95 /*
96 * Get the region_idx`th region from board config/ATAG and convert it to
97 * our internal format.
98 */
99 static int __init get_fbmem_region(int region_idx, struct omapfb_mem_region *rg)
100 {
101 const struct omap_fbmem_config *conf;
102 u32 paddr;
104 conf = omap_get_nr_config(OMAP_TAG_FBMEM,
105 struct omap_fbmem_config, region_idx);
106 if (conf == NULL)
107 return -ENOENT;
109 paddr = conf->start;
110 /*
111 * Low bits encode the page allocation mode, if high bits
112 * are zero. Otherwise we need a page aligned fixed
113 * address.
114 */
115 memset(rg, 0, sizeof(*rg));
116 rg->type = paddr & ~PAGE_MASK;
117 rg->paddr = paddr & PAGE_MASK;
118 rg->size = PAGE_ALIGN(conf->size);
119 return 0;
120 }
122 static int set_fbmem_region_type(struct omapfb_mem_region *rg, int mem_type,
123 unsigned long mem_start,
124 unsigned long mem_size)
125 {
126 /*
127 * Check if the configuration specifies the type explicitly.
128 * type = 0 && paddr = 0, a default don't care case maps to
129 * the SDRAM type.
130 */
131 if (rg->type || !rg->paddr)
132 return 0;
133 if (ranges_overlap(rg->paddr, rg->size, mem_start, mem_size)) {
134 rg->type = mem_type;
135 return 0;
136 }
137 /* Can't determine it. */
138 return -1;
139 }
141 static int check_fbmem_region(int region_idx, struct omapfb_mem_region *rg,
142 unsigned long start_avail, unsigned size_avail)
143 {
144 unsigned long paddr = rg->paddr;
145 size_t size = rg->size;
147 if (rg->type > OMAPFB_MEMTYPE_MAX) {
148 printk(KERN_ERR
149 "Invalid start address for FB region %d\n", region_idx);
150 return -EINVAL;
151 }
153 if (!rg->size) {
154 printk(KERN_ERR "Zero size for FB region %d\n", region_idx);
155 return -EINVAL;
156 }
158 if (!paddr)
159 /* Allocate this dynamically, leave paddr 0 for now. */
160 return 0;
162 /*
163 * Fixed region for the given RAM range. Check if it's already
164 * reserved by the FB code or someone else.
165 */
166 if (fbmem_region_reserved(paddr, size) ||
167 !range_included(paddr, size, start_avail, size_avail)) {
168 printk(KERN_ERR "Trying to use reserved memory "
169 "for FB region %d\n", region_idx);
170 return -EINVAL;
171 }
173 return 0;
174 }
176 static int valid_sdram(unsigned long addr, unsigned long size)
177 {
178 return memblock_is_region_memory(addr, size);
179 }
181 static int reserve_sdram(unsigned long addr, unsigned long size)
182 {
183 if (memblock_is_region_reserved(addr, size))
184 return -EBUSY;
185 if (memblock_reserve(addr, size))
186 return -ENOMEM;
187 return 0;
188 }
190 /*
191 * Called from map_io. We need to call to this early enough so that we
192 * can reserve the fixed SDRAM regions before VM could get hold of them.
193 */
194 void __init omapfb_reserve_sdram_memblock(void)
195 {
196 unsigned long reserved = 0;
197 int i;
199 if (config_invalid)
200 return;
202 for (i = 0; ; i++) {
203 struct omapfb_mem_region rg;
205 if (get_fbmem_region(i, &rg) < 0)
206 break;
208 if (i == OMAPFB_PLANE_NUM) {
209 pr_err("Extraneous FB mem configuration entries\n");
210 config_invalid = 1;
211 return;
212 }
214 /* Check if it's our memory type. */
215 if (rg.type != OMAPFB_MEMTYPE_SDRAM)
216 continue;
218 /* Check if the region falls within SDRAM */
219 if (rg.paddr && !valid_sdram(rg.paddr, rg.size))
220 continue;
222 if (rg.size == 0) {
223 pr_err("Zero size for FB region %d\n", i);
224 config_invalid = 1;
225 return;
226 }
228 if (rg.paddr) {
229 if (reserve_sdram(rg.paddr, rg.size)) {
230 pr_err("Trying to use reserved memory for FB region %d\n",
231 i);
232 config_invalid = 1;
233 return;
234 }
235 reserved += rg.size;
236 }
238 if (omapfb_config.mem_desc.region[i].size) {
239 pr_err("FB region %d already set\n", i);
240 config_invalid = 1;
241 return;
242 }
244 omapfb_config.mem_desc.region[i] = rg;
245 configured_regions++;
246 }
247 omapfb_config.mem_desc.region_cnt = i;
248 if (reserved)
249 pr_info("Reserving %lu bytes SDRAM for frame buffer\n",
250 reserved);
251 }
253 /*
254 * Called at sram init time, before anything is pushed to the SRAM stack.
255 * Because of the stack scheme, we will allocate everything from the
256 * start of the lowest address region to the end of SRAM. This will also
257 * include padding for page alignment and possible holes between regions.
258 *
259 * As opposed to the SDRAM case, we'll also do any dynamic allocations at
260 * this point, since the driver built as a module would have problem with
261 * freeing / reallocating the regions.
262 */
263 unsigned long __init omapfb_reserve_sram(unsigned long sram_pstart,
264 unsigned long sram_vstart,
265 unsigned long sram_size,
266 unsigned long pstart_avail,
267 unsigned long size_avail)
268 {
269 struct omapfb_mem_region rg;
270 unsigned long pend_avail;
271 unsigned long reserved;
272 int i;
274 if (config_invalid)
275 return 0;
277 reserved = 0;
278 pend_avail = pstart_avail + size_avail;
279 for (i = 0; ; i++) {
280 if (get_fbmem_region(i, &rg) < 0)
281 break;
282 if (i == OMAPFB_PLANE_NUM) {
283 printk(KERN_ERR
284 "Extraneous FB mem configuration entries\n");
285 config_invalid = 1;
286 return 0;
287 }
289 /* Check if it's our memory type. */
290 if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SRAM,
291 sram_pstart, sram_size) < 0 ||
292 (rg.type != OMAPFB_MEMTYPE_SRAM))
293 continue;
294 BUG_ON(omapfb_config.mem_desc.region[i].size);
296 if (check_fbmem_region(i, &rg, pstart_avail, size_avail) < 0) {
297 config_invalid = 1;
298 return 0;
299 }
301 if (!rg.paddr) {
302 /* Dynamic allocation */
303 if ((size_avail & PAGE_MASK) < rg.size) {
304 printk("Not enough SRAM for FB region %d\n",
305 i);
306 config_invalid = 1;
307 return 0;
308 }
309 size_avail = (size_avail - rg.size) & PAGE_MASK;
310 rg.paddr = pstart_avail + size_avail;
311 }
312 /* Reserve everything above the start of the region. */
313 if (pend_avail - rg.paddr > reserved)
314 reserved = pend_avail - rg.paddr;
315 size_avail = pend_avail - reserved - pstart_avail;
317 /*
318 * We have a kernel mapping for this already, so the
319 * driver won't have to make one.
320 */
321 rg.vaddr = (void *)(sram_vstart + rg.paddr - sram_pstart);
322 omapfb_config.mem_desc.region[i] = rg;
323 configured_regions++;
324 }
325 omapfb_config.mem_desc.region_cnt = i;
326 if (reserved)
327 pr_info("Reserving %lu bytes SRAM for frame buffer\n",
328 reserved);
329 return reserved;
330 }
332 void omapfb_set_ctrl_platform_data(void *data)
333 {
334 omapfb_config.ctrl_platform_data = data;
335 }
337 static int __init omap_init_fb(void)
338 {
339 const struct omap_lcd_config *conf;
341 if (config_invalid)
342 return 0;
343 if (configured_regions != omapfb_config.mem_desc.region_cnt) {
344 printk(KERN_ERR "Invalid FB mem configuration entries\n");
345 return 0;
346 }
347 conf = omap_get_config(OMAP_TAG_LCD, struct omap_lcd_config);
348 if (conf == NULL) {
349 if (configured_regions)
350 /* FB mem config, but no LCD config? */
351 printk(KERN_ERR "Missing LCD configuration\n");
352 return 0;
353 }
354 omapfb_config.lcd = *conf;
356 return platform_device_register(&omap_fb_device);
357 }
359 arch_initcall(omap_init_fb);
361 #elif defined(CONFIG_FB_OMAP2) || defined(CONFIG_FB_OMAP2_MODULE)
363 static u64 omap_fb_dma_mask = ~(u32)0;
364 static struct omapfb_platform_data omapfb_config;
366 static struct platform_device omap_fb_device = {
367 .name = "omapfb",
368 .id = -1,
369 .dev = {
370 .dma_mask = &omap_fb_dma_mask,
371 .coherent_dma_mask = ~(u32)0,
372 .platform_data = &omapfb_config,
373 },
374 .num_resources = 0,
375 };
377 void omapfb_set_platform_data(struct omapfb_platform_data *data)
378 {
379 omapfb_config = *data;
380 }
382 static int __init omap_init_fb(void)
383 {
384 return platform_device_register(&omap_fb_device);
385 }
387 arch_initcall(omap_init_fb);
389 void omapfb_reserve_sdram_memblock(void)
390 {
391 }
393 unsigned long __init omapfb_reserve_sram(unsigned long sram_pstart,
394 unsigned long sram_vstart,
395 unsigned long sram_size,
396 unsigned long start_avail,
397 unsigned long size_avail)
398 {
399 return 0;
400 }
402 #else
404 void omapfb_set_platform_data(struct omapfb_platform_data *data)
405 {
406 }
408 void omapfb_reserve_sdram_memblock(void)
409 {
410 }
412 unsigned long __init omapfb_reserve_sram(unsigned long sram_pstart,
413 unsigned long sram_vstart,
414 unsigned long sram_size,
415 unsigned long start_avail,
416 unsigned long size_avail)
417 {
418 return 0;
419 }
421 #endif