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/err.h>
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/ioport.h>
  27 #include <linux/io.h>
  28 #include <linux/bitops.h>
  29 #include <linux/mutex.h>
  30 #include <linux/platform_device.h>
  31
  32 #include <video/omapvrfb.h>
  33
  34 #ifdef DEBUG
  35 #define DBG(format, ...) pr_debug("VRFB: " format, ## __VA_ARGS__)
  36 #else
  37 #define DBG(format, ...)
  38 #endif
  39
  40 #define SMS_ROT_CONTROL(context)        (0x0 + 0x10 * context)
  41 #define SMS_ROT_SIZE(context)           (0x4 + 0x10 * context)
  42 #define SMS_ROT_PHYSICAL_BA(context)    (0x8 + 0x10 * context)
  43 #define SMS_ROT_VIRT_BASE(rot)          (0x1000000 * (rot))
  44
  45 #define OMAP_VRFB_SIZE                  (2048 * 2048 * 4)
  46
  47 #define VRFB_PAGE_WIDTH_EXP     5 /* Assuming SDRAM pagesize= 1024 */
  48 #define VRFB_PAGE_HEIGHT_EXP    5 /* 1024 = 2^5 * 2^5 */
  49 #define VRFB_PAGE_WIDTH         (1 << VRFB_PAGE_WIDTH_EXP)
  50 #define VRFB_PAGE_HEIGHT        (1 << VRFB_PAGE_HEIGHT_EXP)
  51 #define SMS_IMAGEHEIGHT_OFFSET  16
  52 #define SMS_IMAGEWIDTH_OFFSET   0
  53 #define SMS_PH_OFFSET           8
  54 #define SMS_PW_OFFSET           4
  55 #define SMS_PS_OFFSET           0
  56
  57 /* bitmap of reserved contexts */
  58 static unsigned long ctx_map;
  59
  60 struct vrfb_ctx {
  61         u32 base;
  62         u32 physical_ba;
  63         u32 control;
  64         u32 size;
  65 };
  66
  67 static DEFINE_MUTEX(ctx_lock);
  68
  69 /*
  70  * Access to this happens from client drivers or the PM core after wake-up.
  71  * For the first case we require locking at the driver level, for the second
  72  * we don't need locking, since no drivers will run until after the wake-up
  73  * has finished.
  74  */
  75
  76 static void __iomem *vrfb_base;
  77
  78 static int num_ctxs;
  79 static struct vrfb_ctx *ctxs;
  80
  81 static bool vrfb_loaded;
  82
  83 static void omap2_sms_write_rot_control(u32 val, unsigned ctx)
  84 {
  85         __raw_writel(val, vrfb_base + SMS_ROT_CONTROL(ctx));
  86 }
  87
  88 static void omap2_sms_write_rot_size(u32 val, unsigned ctx)
  89 {
  90         __raw_writel(val, vrfb_base + SMS_ROT_SIZE(ctx));
  91 }
  92
  93 static void omap2_sms_write_rot_physical_ba(u32 val, unsigned ctx)
  94 {
  95         __raw_writel(val, vrfb_base + SMS_ROT_PHYSICAL_BA(ctx));
  96 }
  97
  98 static inline void restore_hw_context(int ctx)
  99 {
 100         omap2_sms_write_rot_control(ctxs[ctx].control, ctx);
 101         omap2_sms_write_rot_size(ctxs[ctx].size, ctx);
 102         omap2_sms_write_rot_physical_ba(ctxs[ctx].physical_ba, ctx);
 103 }
 104
 105 static u32 get_image_width_roundup(u16 width, u8 bytespp)
 106 {
 107         unsigned long stride = width * bytespp;
 108         unsigned long ceil_pages_per_stride = (stride / VRFB_PAGE_WIDTH) +
 109                 (stride % VRFB_PAGE_WIDTH != 0);
 110
 111         return ceil_pages_per_stride * VRFB_PAGE_WIDTH / bytespp;
 112 }
 113
 114 /*
 115  * This the extra space needed in the VRFB physical area for VRFB to safely wrap
 116  * any memory accesses to the invisible part of the virtual view to the physical
 117  * area.
 118  */
 119 static inline u32 get_extra_physical_size(u16 image_width_roundup, u8 bytespp)
 120 {
 121         return (OMAP_VRFB_LINE_LEN - image_width_roundup) * VRFB_PAGE_HEIGHT *
 122                 bytespp;
 123 }
 124
 125 void omap_vrfb_restore_context(void)
 126 {
 127         int i;
 128         unsigned long map = ctx_map;
 129
 130         for (i = ffs(map); i; i = ffs(map)) {
 131                 /* i=1..32 */
 132                 i--;
 133                 map &= ~(1 << i);
 134                 restore_hw_context(i);
 135         }
 136 }
 137
 138 void omap_vrfb_adjust_size(u16 *width, u16 *height,
 139                 u8 bytespp)
 140 {
 141         *width = ALIGN(*width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
 142         *height = ALIGN(*height, VRFB_PAGE_HEIGHT);
 143 }
 144 EXPORT_SYMBOL(omap_vrfb_adjust_size);
 145
 146 u32 omap_vrfb_min_phys_size(u16 width, u16 height, u8 bytespp)
 147 {
 148         unsigned long image_width_roundup = get_image_width_roundup(width,
 149                 bytespp);
 150
 151         if (image_width_roundup > OMAP_VRFB_LINE_LEN)
 152                 return 0;
 153
 154         return (width * height * bytespp) + get_extra_physical_size(
 155                 image_width_roundup, bytespp);
 156 }
 157 EXPORT_SYMBOL(omap_vrfb_min_phys_size);
 158
 159 u16 omap_vrfb_max_height(u32 phys_size, u16 width, u8 bytespp)
 160 {
 161         unsigned long image_width_roundup = get_image_width_roundup(width,
 162                 bytespp);
 163         unsigned long height;
 164         unsigned long extra;
 165
 166         if (image_width_roundup > OMAP_VRFB_LINE_LEN)
 167                 return 0;
 168
 169         extra = get_extra_physical_size(image_width_roundup, bytespp);
 170
 171         if (phys_size < extra)
 172                 return 0;
 173
 174         height = (phys_size - extra) / (width * bytespp);
 175
 176         /* Virtual views provided by VRFB are limited to 2048x2048. */
 177         return min_t(unsigned long, height, 2048);
 178 }
 179 EXPORT_SYMBOL(omap_vrfb_max_height);
 180
 181 void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr,
 182                 u16 width, u16 height,
 183                 unsigned bytespp, bool yuv_mode)
 184 {
 185         unsigned pixel_size_exp;
 186         u16 vrfb_width;
 187         u16 vrfb_height;
 188         u8 ctx = vrfb->context;
 189         u32 size;
 190         u32 control;
 191
 192         DBG("omapfb_set_vrfb(%d, %lx, %dx%d, %d, %d)\n", ctx, paddr,
 193                         width, height, bytespp, yuv_mode);
 194
 195         /* For YUV2 and UYVY modes VRFB needs to handle pixels a bit
 196          * differently. See TRM. */
 197         if (yuv_mode) {
 198                 bytespp *= 2;
 199                 width /= 2;
 200         }
 201
 202         if (bytespp == 4)
 203                 pixel_size_exp = 2;
 204         else if (bytespp == 2)
 205                 pixel_size_exp = 1;
 206         else {
 207                 BUG();
 208                 return;
 209         }
 210
 211         vrfb_width = ALIGN(width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
 212         vrfb_height = ALIGN(height, VRFB_PAGE_HEIGHT);
 213
 214         DBG("vrfb w %u, h %u bytespp %d\n", vrfb_width, vrfb_height, bytespp);
 215
 216         size  = vrfb_width << SMS_IMAGEWIDTH_OFFSET;
 217         size |= vrfb_height << SMS_IMAGEHEIGHT_OFFSET;
 218
 219         control  = pixel_size_exp << SMS_PS_OFFSET;
 220         control |= VRFB_PAGE_WIDTH_EXP  << SMS_PW_OFFSET;
 221         control |= VRFB_PAGE_HEIGHT_EXP << SMS_PH_OFFSET;
 222
 223         ctxs[ctx].physical_ba = paddr;
 224         ctxs[ctx].size = size;
 225         ctxs[ctx].control = control;
 226
 227         omap2_sms_write_rot_physical_ba(paddr, ctx);
 228         omap2_sms_write_rot_size(size, ctx);
 229         omap2_sms_write_rot_control(control, ctx);
 230
 231         DBG("vrfb offset pixels %d, %d\n",
 232                         vrfb_width - width, vrfb_height - height);
 233
 234         vrfb->xres = width;
 235         vrfb->yres = height;
 236         vrfb->xoffset = vrfb_width - width;
 237         vrfb->yoffset = vrfb_height - height;
 238         vrfb->bytespp = bytespp;
 239         vrfb->yuv_mode = yuv_mode;
 240 }
 241 EXPORT_SYMBOL(omap_vrfb_setup);
 242
 243 int omap_vrfb_map_angle(struct vrfb *vrfb, u16 height, u8 rot)
 244 {
 245         unsigned long size = height * OMAP_VRFB_LINE_LEN * vrfb->bytespp;
 246
 247         vrfb->vaddr[rot] = ioremap_wc(vrfb->paddr[rot], size);
 248
 249         if (!vrfb->vaddr[rot]) {
 250                 printk(KERN_ERR "vrfb: ioremap failed\n");
 251                 return -ENOMEM;
 252         }
 253
 254         DBG("ioremapped vrfb area %d of size %lu into %p\n", rot, size,
 255                 vrfb->vaddr[rot]);
 256
 257         return 0;
 258 }
 259 EXPORT_SYMBOL(omap_vrfb_map_angle);
 260
 261 void omap_vrfb_release_ctx(struct vrfb *vrfb)
 262 {
 263         int rot;
 264         int ctx = vrfb->context;
 265
 266         if (ctx == 0xff)
 267                 return;
 268
 269         DBG("release ctx %d\n", ctx);
 270
 271         mutex_lock(&ctx_lock);
 272
 273         BUG_ON(!(ctx_map & (1 << ctx)));
 274
 275         clear_bit(ctx, &ctx_map);
 276
 277         for (rot = 0; rot < 4; ++rot) {
 278                 if (vrfb->paddr[rot]) {
 279                         release_mem_region(vrfb->paddr[rot], OMAP_VRFB_SIZE);
 280                         vrfb->paddr[rot] = 0;
 281                 }
 282         }
 283
 284         vrfb->context = 0xff;
 285
 286         mutex_unlock(&ctx_lock);
 287 }
 288 EXPORT_SYMBOL(omap_vrfb_release_ctx);
 289
 290 int omap_vrfb_request_ctx(struct vrfb *vrfb)
 291 {
 292         int rot;
 293         u32 paddr;
 294         u8 ctx;
 295         int r;
 296
 297         DBG("request ctx\n");
 298
 299         mutex_lock(&ctx_lock);
 300
 301         for (ctx = 0; ctx < num_ctxs; ++ctx)
 302                 if ((ctx_map & (1 << ctx)) == 0)
 303                         break;
 304
 305         if (ctx == num_ctxs) {
 306                 pr_err("vrfb: no free contexts\n");
 307                 r = -EBUSY;
 308                 goto out;
 309         }
 310
 311         DBG("found free ctx %d\n", ctx);
 312
 313         set_bit(ctx, &ctx_map);
 314
 315         memset(vrfb, 0, sizeof(*vrfb));
 316
 317         vrfb->context = ctx;
 318
 319         for (rot = 0; rot < 4; ++rot) {
 320                 paddr = ctxs[ctx].base + SMS_ROT_VIRT_BASE(rot);
 321                 if (!request_mem_region(paddr, OMAP_VRFB_SIZE, "vrfb")) {
 322                         pr_err("vrfb: failed to reserve VRFB "
 323                                         "area for ctx %d, rotation %d\n",
 324                                         ctx, rot * 90);
 325                         omap_vrfb_release_ctx(vrfb);
 326                         r = -ENOMEM;
 327                         goto out;
 328                 }
 329
 330                 vrfb->paddr[rot] = paddr;
 331
 332                 DBG("VRFB %d/%d: %lx\n", ctx, rot*90, vrfb->paddr[rot]);
 333         }
 334
 335         r = 0;
 336 out:
 337         mutex_unlock(&ctx_lock);
 338         return r;
 339 }
 340 EXPORT_SYMBOL(omap_vrfb_request_ctx);
 341
 342 bool omap_vrfb_supported(void)
 343 {
 344         return vrfb_loaded;
 345 }
 346 EXPORT_SYMBOL(omap_vrfb_supported);
 347
 348 static int __init vrfb_probe(struct platform_device *pdev)
 349 {
 350         struct resource *mem;
 351         int i;
 352
 353         /* first resource is the register res, the rest are vrfb contexts */
 354
 355         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 356         vrfb_base = devm_ioremap_resource(&pdev->dev, mem);
 357         if (IS_ERR(vrfb_base))
 358                 return PTR_ERR(vrfb_base);
 359
 360         num_ctxs = pdev->num_resources - 1;
 361
 362         ctxs = devm_kzalloc(&pdev->dev,
 363                         sizeof(struct vrfb_ctx) * num_ctxs,
 364                         GFP_KERNEL);
 365
 366         if (!ctxs)
 367                 return -ENOMEM;
 368
 369         for (i = 0; i < num_ctxs; ++i) {
 370                 mem = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i);
 371                 if (!mem) {
 372                         dev_err(&pdev->dev, "can't get vrfb ctx %d address\n",
 373                                         i);
 374                         return -EINVAL;
 375                 }
 376
 377                 ctxs[i].base = mem->start;
 378         }
 379
 380         vrfb_loaded = true;
 381
 382         return 0;
 383 }
 384
 385 static void __exit vrfb_remove(struct platform_device *pdev)
 386 {
 387         vrfb_loaded = false;
 388 }
 389
 390 static struct platform_driver vrfb_driver = {
 391         .driver.name    = "omapvrfb",
 392         .remove         = __exit_p(vrfb_remove),
 393 };
 394
 395 module_platform_driver_probe(vrfb_driver, vrfb_probe);
 396
 397 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 398 MODULE_DESCRIPTION("OMAP VRFB");
 399 MODULE_LICENSE("GPL v2");