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Tomi Valkeinen640f9ca2009-08-07 12:04:26 +03001/*
2 * VRFB Rotation Engine
3 *
4 * Copyright (C) 2009 Nokia Corporation
5 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21/*#define DEBUG*/
22
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/ioport.h>
26#include <linux/io.h>
27#include <linux/bitops.h>
28#include <linux/mutex.h>
29
Tomi Valkeinen640f9ca2009-08-07 12:04:26 +030030#include <plat/vrfb.h>
31#include <plat/sdrc.h>
32
33#ifdef DEBUG
34#define DBG(format, ...) pr_debug("VRFB: " format, ## __VA_ARGS__)
35#else
36#define DBG(format, ...)
37#endif
38
39#define SMS_ROT_VIRT_BASE(context, rot) \
40 (((context >= 4) ? 0xD0000000 : 0x70000000) \
41 + (0x4000000 * (context)) \
42 + (0x1000000 * (rot)))
43
44#define OMAP_VRFB_SIZE (2048 * 2048 * 4)
45
46#define VRFB_PAGE_WIDTH_EXP 5 /* Assuming SDRAM pagesize= 1024 */
47#define VRFB_PAGE_HEIGHT_EXP 5 /* 1024 = 2^5 * 2^5 */
48#define VRFB_PAGE_WIDTH (1 << VRFB_PAGE_WIDTH_EXP)
49#define VRFB_PAGE_HEIGHT (1 << VRFB_PAGE_HEIGHT_EXP)
50#define SMS_IMAGEHEIGHT_OFFSET 16
51#define SMS_IMAGEWIDTH_OFFSET 0
52#define SMS_PH_OFFSET 8
53#define SMS_PW_OFFSET 4
54#define SMS_PS_OFFSET 0
55
56#define VRFB_NUM_CTXS 12
57/* bitmap of reserved contexts */
58static unsigned long ctx_map;
59
60static DEFINE_MUTEX(ctx_lock);
61
62/*
63 * Access to this happens from client drivers or the PM core after wake-up.
64 * For the first case we require locking at the driver level, for the second
65 * we don't need locking, since no drivers will run until after the wake-up
66 * has finished.
67 */
68static struct {
69 u32 physical_ba;
70 u32 control;
71 u32 size;
72} vrfb_hw_context[VRFB_NUM_CTXS];
73
74static inline void restore_hw_context(int ctx)
75{
76 omap2_sms_write_rot_control(vrfb_hw_context[ctx].control, ctx);
77 omap2_sms_write_rot_size(vrfb_hw_context[ctx].size, ctx);
78 omap2_sms_write_rot_physical_ba(vrfb_hw_context[ctx].physical_ba, ctx);
79}
80
81static u32 get_image_width_roundup(u16 width, u8 bytespp)
82{
83 unsigned long stride = width * bytespp;
84 unsigned long ceil_pages_per_stride = (stride / VRFB_PAGE_WIDTH) +
85 (stride % VRFB_PAGE_WIDTH != 0);
86
87 return ceil_pages_per_stride * VRFB_PAGE_WIDTH / bytespp;
88}
89
90/*
91 * This the extra space needed in the VRFB physical area for VRFB to safely wrap
92 * any memory accesses to the invisible part of the virtual view to the physical
93 * area.
94 */
95static inline u32 get_extra_physical_size(u16 image_width_roundup, u8 bytespp)
96{
97 return (OMAP_VRFB_LINE_LEN - image_width_roundup) * VRFB_PAGE_HEIGHT *
98 bytespp;
99}
100
101void omap_vrfb_restore_context(void)
102{
103 int i;
104 unsigned long map = ctx_map;
105
106 for (i = ffs(map); i; i = ffs(map)) {
107 /* i=1..32 */
108 i--;
109 map &= ~(1 << i);
110 restore_hw_context(i);
111 }
112}
113
114void omap_vrfb_adjust_size(u16 *width, u16 *height,
115 u8 bytespp)
116{
117 *width = ALIGN(*width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
118 *height = ALIGN(*height, VRFB_PAGE_HEIGHT);
119}
120EXPORT_SYMBOL(omap_vrfb_adjust_size);
121
122u32 omap_vrfb_min_phys_size(u16 width, u16 height, u8 bytespp)
123{
124 unsigned long image_width_roundup = get_image_width_roundup(width,
125 bytespp);
126
127 if (image_width_roundup > OMAP_VRFB_LINE_LEN)
128 return 0;
129
130 return (width * height * bytespp) + get_extra_physical_size(
131 image_width_roundup, bytespp);
132}
133EXPORT_SYMBOL(omap_vrfb_min_phys_size);
134
135u16 omap_vrfb_max_height(u32 phys_size, u16 width, u8 bytespp)
136{
137 unsigned long image_width_roundup = get_image_width_roundup(width,
138 bytespp);
139 unsigned long height;
140 unsigned long extra;
141
142 if (image_width_roundup > OMAP_VRFB_LINE_LEN)
143 return 0;
144
145 extra = get_extra_physical_size(image_width_roundup, bytespp);
146
147 if (phys_size < extra)
148 return 0;
149
150 height = (phys_size - extra) / (width * bytespp);
151
152 /* Virtual views provided by VRFB are limited to 2048x2048. */
153 return min_t(unsigned long, height, 2048);
154}
155EXPORT_SYMBOL(omap_vrfb_max_height);
156
157void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr,
158 u16 width, u16 height,
159 unsigned bytespp, bool yuv_mode)
160{
161 unsigned pixel_size_exp;
162 u16 vrfb_width;
163 u16 vrfb_height;
164 u8 ctx = vrfb->context;
165 u32 size;
166 u32 control;
167
168 DBG("omapfb_set_vrfb(%d, %lx, %dx%d, %d, %d)\n", ctx, paddr,
169 width, height, bytespp, yuv_mode);
170
171 /* For YUV2 and UYVY modes VRFB needs to handle pixels a bit
172 * differently. See TRM. */
173 if (yuv_mode) {
174 bytespp *= 2;
175 width /= 2;
176 }
177
178 if (bytespp == 4)
179 pixel_size_exp = 2;
180 else if (bytespp == 2)
181 pixel_size_exp = 1;
Tomi Valkeinen3cb6a1b92012-05-18 11:49:53 +0300182 else {
Tomi Valkeinen640f9ca2009-08-07 12:04:26 +0300183 BUG();
Tomi Valkeinen3cb6a1b92012-05-18 11:49:53 +0300184 return;
185 }
Tomi Valkeinen640f9ca2009-08-07 12:04:26 +0300186
187 vrfb_width = ALIGN(width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
188 vrfb_height = ALIGN(height, VRFB_PAGE_HEIGHT);
189
190 DBG("vrfb w %u, h %u bytespp %d\n", vrfb_width, vrfb_height, bytespp);
191
192 size = vrfb_width << SMS_IMAGEWIDTH_OFFSET;
193 size |= vrfb_height << SMS_IMAGEHEIGHT_OFFSET;
194
195 control = pixel_size_exp << SMS_PS_OFFSET;
196 control |= VRFB_PAGE_WIDTH_EXP << SMS_PW_OFFSET;
197 control |= VRFB_PAGE_HEIGHT_EXP << SMS_PH_OFFSET;
198
199 vrfb_hw_context[ctx].physical_ba = paddr;
200 vrfb_hw_context[ctx].size = size;
201 vrfb_hw_context[ctx].control = control;
202
203 omap2_sms_write_rot_physical_ba(paddr, ctx);
204 omap2_sms_write_rot_size(size, ctx);
205 omap2_sms_write_rot_control(control, ctx);
206
207 DBG("vrfb offset pixels %d, %d\n",
208 vrfb_width - width, vrfb_height - height);
209
210 vrfb->xres = width;
211 vrfb->yres = height;
212 vrfb->xoffset = vrfb_width - width;
213 vrfb->yoffset = vrfb_height - height;
214 vrfb->bytespp = bytespp;
215 vrfb->yuv_mode = yuv_mode;
216}
217EXPORT_SYMBOL(omap_vrfb_setup);
218
219int omap_vrfb_map_angle(struct vrfb *vrfb, u16 height, u8 rot)
220{
221 unsigned long size = height * OMAP_VRFB_LINE_LEN * vrfb->bytespp;
222
223 vrfb->vaddr[rot] = ioremap_wc(vrfb->paddr[rot], size);
224
225 if (!vrfb->vaddr[rot]) {
226 printk(KERN_ERR "vrfb: ioremap failed\n");
227 return -ENOMEM;
228 }
229
230 DBG("ioremapped vrfb area %d of size %lu into %p\n", rot, size,
231 vrfb->vaddr[rot]);
232
233 return 0;
234}
235EXPORT_SYMBOL(omap_vrfb_map_angle);
236
237void omap_vrfb_release_ctx(struct vrfb *vrfb)
238{
239 int rot;
240 int ctx = vrfb->context;
241
242 if (ctx == 0xff)
243 return;
244
245 DBG("release ctx %d\n", ctx);
246
247 mutex_lock(&ctx_lock);
248
249 BUG_ON(!(ctx_map & (1 << ctx)));
250
251 clear_bit(ctx, &ctx_map);
252
253 for (rot = 0; rot < 4; ++rot) {
254 if (vrfb->paddr[rot]) {
255 release_mem_region(vrfb->paddr[rot], OMAP_VRFB_SIZE);
256 vrfb->paddr[rot] = 0;
257 }
258 }
259
260 vrfb->context = 0xff;
261
262 mutex_unlock(&ctx_lock);
263}
264EXPORT_SYMBOL(omap_vrfb_release_ctx);
265
266int omap_vrfb_request_ctx(struct vrfb *vrfb)
267{
268 int rot;
269 u32 paddr;
270 u8 ctx;
271 int r;
272
273 DBG("request ctx\n");
274
275 mutex_lock(&ctx_lock);
276
277 for (ctx = 0; ctx < VRFB_NUM_CTXS; ++ctx)
278 if ((ctx_map & (1 << ctx)) == 0)
279 break;
280
281 if (ctx == VRFB_NUM_CTXS) {
282 pr_err("vrfb: no free contexts\n");
283 r = -EBUSY;
284 goto out;
285 }
286
287 DBG("found free ctx %d\n", ctx);
288
289 set_bit(ctx, &ctx_map);
290
291 memset(vrfb, 0, sizeof(*vrfb));
292
293 vrfb->context = ctx;
294
295 for (rot = 0; rot < 4; ++rot) {
296 paddr = SMS_ROT_VIRT_BASE(ctx, rot);
297 if (!request_mem_region(paddr, OMAP_VRFB_SIZE, "vrfb")) {
298 pr_err("vrfb: failed to reserve VRFB "
299 "area for ctx %d, rotation %d\n",
300 ctx, rot * 90);
301 omap_vrfb_release_ctx(vrfb);
302 r = -ENOMEM;
303 goto out;
304 }
305
306 vrfb->paddr[rot] = paddr;
307
308 DBG("VRFB %d/%d: %lx\n", ctx, rot*90, vrfb->paddr[rot]);
309 }
310
311 r = 0;
312out:
313 mutex_unlock(&ctx_lock);
314 return r;
315}
316EXPORT_SYMBOL(omap_vrfb_request_ctx);