drivers/video/omap2/vrfb.c

   1 /*
   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
  30 #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 */
  58 static unsigned long ctx_map;
  59
  60 static 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  */
  68 static struct {
  69         u32 physical_ba;
  70         u32 control;
  71         u32 size;
  72 } vrfb_hw_context[VRFB_NUM_CTXS];
  73
  74 static 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
  81 static 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  */
  95 static 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
 101 void 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
 114 void 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 }
 120 EXPORT_SYMBOL(omap_vrfb_adjust_size);
 121
 122 u32 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 }
 133 EXPORT_SYMBOL(omap_vrfb_min_phys_size);
 134
 135 u16 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 }
 155 EXPORT_SYMBOL(omap_vrfb_max_height);
 156
 157 void 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;
 182         else {
 183                 BUG();
 184                 return;
 185         }
 186
 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 }
 217 EXPORT_SYMBOL(omap_vrfb_setup);
 218
 219 int 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 }
 235 EXPORT_SYMBOL(omap_vrfb_map_angle);
 236
 237 void 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 }
 264 EXPORT_SYMBOL(omap_vrfb_release_ctx);
 265
 266 int 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;
 312 out:
 313         mutex_unlock(&ctx_lock);
 314         return r;
 315 }
 316 EXPORT_SYMBOL(omap_vrfb_request_ctx);