Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
[linux-2.6-block.git] / arch / arm / plat-omap / fb.c
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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
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24#include <linux/module.h>
25#include <linux/kernel.h>
27ac792c 26#include <linux/mm.h>
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27#include <linux/init.h>
28#include <linux/platform_device.h>
29#include <linux/bootmem.h>
fced80c7 30#include <linux/io.h>
0dc5e77c 31
a09e64fb 32#include <mach/hardware.h>
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33#include <asm/mach/map.h>
34
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35#include <plat/board.h>
36#include <plat/sram.h>
37#include <plat/omapfb.h>
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38
39#if defined(CONFIG_FB_OMAP) || defined(CONFIG_FB_OMAP_MODULE)
40
41static struct omapfb_platform_data omapfb_config;
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42static int config_invalid;
43static int configured_regions;
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44
45static u64 omap_fb_dma_mask = ~(u32)0;
46
47static 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
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58static inline int ranges_overlap(unsigned long start1, unsigned long size1,
59 unsigned long start2, unsigned long size2)
0dc5e77c 60{
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61 return (start1 >= start2 && start1 < start2 + size2) ||
62 (start2 >= start1 && start2 < start1 + size1);
63}
64
65static 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. */
73static int fbmem_region_reserved(unsigned long start, size_t size)
74{
75 struct omapfb_mem_region *rg;
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76 int i;
77
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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;
c40fae95 85 }
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86 return 0;
87}
c40fae95 88
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89/*
90 * Get the region_idx`th region from board config/ATAG and convert it to
91 * our internal format.
92 */
93static int get_fbmem_region(int region_idx, struct omapfb_mem_region *rg)
94{
95 const struct omap_fbmem_config *conf;
96 u32 paddr;
0dc5e77c 97
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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
116static 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
135static 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 */
342fb3dd 174void __init omapfb_reserve_sdram(void)
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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;
3560e249 185 sdram_start = bdata->node_min_pfn << PAGE_SHIFT;
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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)
c40fae95 192 break;
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193 if (i == OMAPFB_PLANE_NUM) {
194 printk(KERN_ERR
195 "Extraneous FB mem configuration entries\n");
196 config_invalid = 1;
197 return;
0dc5e77c 198 }
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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;
c40fae95 208 }
72af2b36 209 if (rg.paddr) {
72a7fe39 210 reserve_bootmem(rg.paddr, rg.size, BOOTMEM_DEFAULT);
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211 reserved += rg.size;
212 }
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213 omapfb_config.mem_desc.region[i] = rg;
214 configured_regions++;
0dc5e77c 215 }
c40fae95 216 omapfb_config.mem_desc.region_cnt = i;
b7cc6d46 217 if (reserved)
c40fae95 218 pr_info("Reserving %lu bytes SDRAM for frame buffer\n",
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219 reserved);
220}
221
222/*
223 * Called at sram init time, before anything is pushed to the SRAM stack.
224 * Because of the stack scheme, we will allocate everything from the
225 * start of the lowest address region to the end of SRAM. This will also
226 * include padding for page alignment and possible holes between regions.
227 *
228 * As opposed to the SDRAM case, we'll also do any dynamic allocations at
229 * this point, since the driver built as a module would have problem with
230 * freeing / reallocating the regions.
231 */
232unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
233 unsigned long sram_vstart,
234 unsigned long sram_size,
235 unsigned long pstart_avail,
236 unsigned long size_avail)
237{
238 struct omapfb_mem_region rg;
239 unsigned long pend_avail;
240 unsigned long reserved;
241 int i;
242
243 if (config_invalid)
244 return 0;
245
246 reserved = 0;
247 pend_avail = pstart_avail + size_avail;
248 for (i = 0; ; i++) {
249 if (get_fbmem_region(i, &rg) < 0)
250 break;
251 if (i == OMAPFB_PLANE_NUM) {
252 printk(KERN_ERR
253 "Extraneous FB mem configuration entries\n");
254 config_invalid = 1;
255 return 0;
256 }
c40fae95 257
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258 /* Check if it's our memory type. */
259 if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SRAM,
260 sram_pstart, sram_size) < 0 ||
261 (rg.type != OMAPFB_MEMTYPE_SRAM))
262 continue;
263 BUG_ON(omapfb_config.mem_desc.region[i].size);
264
265 if (check_fbmem_region(i, &rg, pstart_avail, size_avail) < 0) {
266 config_invalid = 1;
267 return 0;
268 }
269
270 if (!rg.paddr) {
271 /* Dynamic allocation */
272 if ((size_avail & PAGE_MASK) < rg.size) {
273 printk("Not enough SRAM for FB region %d\n",
274 i);
275 config_invalid = 1;
276 return 0;
277 }
278 size_avail = (size_avail - rg.size) & PAGE_MASK;
279 rg.paddr = pstart_avail + size_avail;
280 }
281 /* Reserve everything above the start of the region. */
282 if (pend_avail - rg.paddr > reserved)
283 reserved = pend_avail - rg.paddr;
284 size_avail = pend_avail - reserved - pstart_avail;
285
286 /*
287 * We have a kernel mapping for this already, so the
288 * driver won't have to make one.
289 */
290 rg.vaddr = (void *)(sram_vstart + rg.paddr - sram_pstart);
291 omapfb_config.mem_desc.region[i] = rg;
292 configured_regions++;
293 }
294 omapfb_config.mem_desc.region_cnt = i;
295 if (reserved)
296 pr_info("Reserving %lu bytes SRAM for frame buffer\n",
297 reserved);
298 return reserved;
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299}
300
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301void omapfb_set_ctrl_platform_data(void *data)
302{
303 omapfb_config.ctrl_platform_data = data;
304}
305
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306static inline int omap_init_fb(void)
307{
308 const struct omap_lcd_config *conf;
309
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310 if (config_invalid)
311 return 0;
312 if (configured_regions != omapfb_config.mem_desc.region_cnt) {
313 printk(KERN_ERR "Invalid FB mem configuration entries\n");
314 return 0;
315 }
0dc5e77c 316 conf = omap_get_config(OMAP_TAG_LCD, struct omap_lcd_config);
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317 if (conf == NULL) {
318 if (configured_regions)
319 /* FB mem config, but no LCD config? */
320 printk(KERN_ERR "Missing LCD configuration\n");
0dc5e77c 321 return 0;
b7cc6d46 322 }
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323 omapfb_config.lcd = *conf;
324
325 return platform_device_register(&omap_fb_device);
326}
327
328arch_initcall(omap_init_fb);
329
330#else
331
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332void omapfb_reserve_sdram(void) {}
333unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
334 unsigned long sram_vstart,
335 unsigned long sram_size,
336 unsigned long start_avail,
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337 unsigned long size_avail)
338{
339 return 0;
340}
b7cc6d46 341
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342
343#endif