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/init.h>
27 #include <linux/platform_device.h>
28 #include <linux/bootmem.h>
29
30 #include <asm/hardware.h>
31 #include <asm/io.h>
32 #include <asm/mach-types.h>
33 #include <asm/mach/map.h>
34
35 #include <asm/arch/board.h>
36 #include <asm/arch/sram.h>
37 #include <asm/arch/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_boot_start;
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
343
344
345
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