arch/arm/mach-omap1/lcd_dma.c

   1 /*
   2  * linux/arch/arm/mach-omap1/lcd_dma.c
   3  *
   4  * Extracted from arch/arm/plat-omap/dma.c
   5  * Copyright (C) 2003 - 2008 Nokia Corporation
   6  * Author: Juha Yrjölä <juha.yrjola@nokia.com>
   7  * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
   8  * Graphics DMA and LCD DMA graphics tranformations
   9  * by Imre Deak <imre.deak@nokia.com>
  10  * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
  11  * Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
  12  * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
  13  *
  14  * Copyright (C) 2009 Texas Instruments
  15  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  16  *
  17  * Support functions for the OMAP internal DMA channels.
  18  *
  19  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the GNU General Public License version 2 as
  21  * published by the Free Software Foundation.
  22  *
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/io.h>
  29
  30 #include <mach/hardware.h>
  31 #include <plat/dma.h>
  32
  33 int omap_lcd_dma_running(void)
  34 {
  35         /*
  36          * On OMAP1510, internal LCD controller will start the transfer
  37          * when it gets enabled, so assume DMA running if LCD enabled.
  38          */
  39         if (cpu_is_omap1510())
  40                 if (omap_readw(0xfffec000 + 0x00) & (1 << 0))
  41                         return 1;
  42
  43         /* Check if LCD DMA is running */
  44         if (cpu_is_omap16xx())
  45                 if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
  46                         return 1;
  47
  48         return 0;
  49 }
  50
  51 static struct lcd_dma_info {
  52         spinlock_t lock;
  53         int reserved;
  54         void (*callback)(u16 status, void *data);
  55         void *cb_data;
  56
  57         int active;
  58         unsigned long addr, size;
  59         int rotate, data_type, xres, yres;
  60         int vxres;
  61         int mirror;
  62         int xscale, yscale;
  63         int ext_ctrl;
  64         int src_port;
  65         int single_transfer;
  66 } lcd_dma;
  67
  68 void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
  69                          int data_type)
  70 {
  71         lcd_dma.addr = addr;
  72         lcd_dma.data_type = data_type;
  73         lcd_dma.xres = fb_xres;
  74         lcd_dma.yres = fb_yres;
  75 }
  76 EXPORT_SYMBOL(omap_set_lcd_dma_b1);
  77
  78 void omap_set_lcd_dma_src_port(int port)
  79 {
  80         lcd_dma.src_port = port;
  81 }
  82
  83 void omap_set_lcd_dma_ext_controller(int external)
  84 {
  85         lcd_dma.ext_ctrl = external;
  86 }
  87 EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
  88
  89 void omap_set_lcd_dma_single_transfer(int single)
  90 {
  91         lcd_dma.single_transfer = single;
  92 }
  93 EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
  94
  95 void omap_set_lcd_dma_b1_rotation(int rotate)
  96 {
  97         if (cpu_is_omap1510()) {
  98                 printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
  99                 BUG();
 100                 return;
 101         }
 102         lcd_dma.rotate = rotate;
 103 }
 104 EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
 105
 106 void omap_set_lcd_dma_b1_mirror(int mirror)
 107 {
 108         if (cpu_is_omap1510()) {
 109                 printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
 110                 BUG();
 111         }
 112         lcd_dma.mirror = mirror;
 113 }
 114 EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
 115
 116 void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
 117 {
 118         if (cpu_is_omap1510()) {
 119                 printk(KERN_ERR "DMA virtual resulotion is not supported "
 120                                 "in 1510 mode\n");
 121                 BUG();
 122         }
 123         lcd_dma.vxres = vxres;
 124 }
 125 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
 126
 127 void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
 128 {
 129         if (cpu_is_omap1510()) {
 130                 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
 131                 BUG();
 132         }
 133         lcd_dma.xscale = xscale;
 134         lcd_dma.yscale = yscale;
 135 }
 136 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
 137
 138 static void set_b1_regs(void)
 139 {
 140         unsigned long top, bottom;
 141         int es;
 142         u16 w;
 143         unsigned long en, fn;
 144         long ei, fi;
 145         unsigned long vxres;
 146         unsigned int xscale, yscale;
 147
 148         switch (lcd_dma.data_type) {
 149         case OMAP_DMA_DATA_TYPE_S8:
 150                 es = 1;
 151                 break;
 152         case OMAP_DMA_DATA_TYPE_S16:
 153                 es = 2;
 154                 break;
 155         case OMAP_DMA_DATA_TYPE_S32:
 156                 es = 4;
 157                 break;
 158         default:
 159                 BUG();
 160                 return;
 161         }
 162
 163         vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
 164         xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
 165         yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
 166         BUG_ON(vxres < lcd_dma.xres);
 167
 168 #define PIXADDR(x, y) (lcd_dma.addr +                                   \
 169                 ((y) * vxres * yscale + (x) * xscale) * es)
 170 #define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
 171
 172         switch (lcd_dma.rotate) {
 173         case 0:
 174                 if (!lcd_dma.mirror) {
 175                         top = PIXADDR(0, 0);
 176                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 177                         /* 1510 DMA requires the bottom address to be 2 more
 178                          * than the actual last memory access location. */
 179                         if (cpu_is_omap1510() &&
 180                                 lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
 181                                         bottom += 2;
 182                         ei = PIXSTEP(0, 0, 1, 0);
 183                         fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
 184                 } else {
 185                         top = PIXADDR(lcd_dma.xres - 1, 0);
 186                         bottom = PIXADDR(0, lcd_dma.yres - 1);
 187                         ei = PIXSTEP(1, 0, 0, 0);
 188                         fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
 189                 }
 190                 en = lcd_dma.xres;
 191                 fn = lcd_dma.yres;
 192                 break;
 193         case 90:
 194                 if (!lcd_dma.mirror) {
 195                         top = PIXADDR(0, lcd_dma.yres - 1);
 196                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
 197                         ei = PIXSTEP(0, 1, 0, 0);
 198                         fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
 199                 } else {
 200                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 201                         bottom = PIXADDR(0, 0);
 202                         ei = PIXSTEP(0, 1, 0, 0);
 203                         fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
 204                 }
 205                 en = lcd_dma.yres;
 206                 fn = lcd_dma.xres;
 207                 break;
 208         case 180:
 209                 if (!lcd_dma.mirror) {
 210                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 211                         bottom = PIXADDR(0, 0);
 212                         ei = PIXSTEP(1, 0, 0, 0);
 213                         fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
 214                 } else {
 215                         top = PIXADDR(0, lcd_dma.yres - 1);
 216                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
 217                         ei = PIXSTEP(0, 0, 1, 0);
 218                         fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
 219                 }
 220                 en = lcd_dma.xres;
 221                 fn = lcd_dma.yres;
 222                 break;
 223         case 270:
 224                 if (!lcd_dma.mirror) {
 225                         top = PIXADDR(lcd_dma.xres - 1, 0);
 226                         bottom = PIXADDR(0, lcd_dma.yres - 1);
 227                         ei = PIXSTEP(0, 0, 0, 1);
 228                         fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
 229                 } else {
 230                         top = PIXADDR(0, 0);
 231                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 232                         ei = PIXSTEP(0, 0, 0, 1);
 233                         fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
 234                 }
 235                 en = lcd_dma.yres;
 236                 fn = lcd_dma.xres;
 237                 break;
 238         default:
 239                 BUG();
 240                 return; /* Suppress warning about uninitialized vars */
 241         }
 242
 243         if (cpu_is_omap1510()) {
 244                 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
 245                 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
 246                 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
 247                 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
 248
 249                 return;
 250         }
 251
 252         /* 1610 regs */
 253         omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
 254         omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
 255         omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
 256         omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
 257
 258         omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
 259         omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
 260
 261         w = omap_readw(OMAP1610_DMA_LCD_CSDP);
 262         w &= ~0x03;
 263         w |= lcd_dma.data_type;
 264         omap_writew(w, OMAP1610_DMA_LCD_CSDP);
 265
 266         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 267         /* Always set the source port as SDRAM for now*/
 268         w &= ~(0x03 << 6);
 269         if (lcd_dma.callback != NULL)
 270                 w |= 1 << 1;            /* Block interrupt enable */
 271         else
 272                 w &= ~(1 << 1);
 273         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 274
 275         if (!(lcd_dma.rotate || lcd_dma.mirror ||
 276               lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
 277                 return;
 278
 279         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 280         /* Set the double-indexed addressing mode */
 281         w |= (0x03 << 12);
 282         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 283
 284         omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
 285         omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
 286         omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
 287 }
 288
 289 static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id)
 290 {
 291         u16 w;
 292
 293         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 294         if (unlikely(!(w & (1 << 3)))) {
 295                 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
 296                 return IRQ_NONE;
 297         }
 298         /* Ack the IRQ */
 299         w |= (1 << 3);
 300         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 301         lcd_dma.active = 0;
 302         if (lcd_dma.callback != NULL)
 303                 lcd_dma.callback(w, lcd_dma.cb_data);
 304
 305         return IRQ_HANDLED;
 306 }
 307
 308 int omap_request_lcd_dma(void (*callback)(u16 status, void *data),
 309                          void *data)
 310 {
 311         spin_lock_irq(&lcd_dma.lock);
 312         if (lcd_dma.reserved) {
 313                 spin_unlock_irq(&lcd_dma.lock);
 314                 printk(KERN_ERR "LCD DMA channel already reserved\n");
 315                 BUG();
 316                 return -EBUSY;
 317         }
 318         lcd_dma.reserved = 1;
 319         spin_unlock_irq(&lcd_dma.lock);
 320         lcd_dma.callback = callback;
 321         lcd_dma.cb_data = data;
 322         lcd_dma.active = 0;
 323         lcd_dma.single_transfer = 0;
 324         lcd_dma.rotate = 0;
 325         lcd_dma.vxres = 0;
 326         lcd_dma.mirror = 0;
 327         lcd_dma.xscale = 0;
 328         lcd_dma.yscale = 0;
 329         lcd_dma.ext_ctrl = 0;
 330         lcd_dma.src_port = 0;
 331
 332         return 0;
 333 }
 334 EXPORT_SYMBOL(omap_request_lcd_dma);
 335
 336 void omap_free_lcd_dma(void)
 337 {
 338         spin_lock(&lcd_dma.lock);
 339         if (!lcd_dma.reserved) {
 340                 spin_unlock(&lcd_dma.lock);
 341                 printk(KERN_ERR "LCD DMA is not reserved\n");
 342                 BUG();
 343                 return;
 344         }
 345         if (!cpu_is_omap1510())
 346                 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
 347                             OMAP1610_DMA_LCD_CCR);
 348         lcd_dma.reserved = 0;
 349         spin_unlock(&lcd_dma.lock);
 350 }
 351 EXPORT_SYMBOL(omap_free_lcd_dma);
 352
 353 void omap_enable_lcd_dma(void)
 354 {
 355         u16 w;
 356
 357         /*
 358          * Set the Enable bit only if an external controller is
 359          * connected. Otherwise the OMAP internal controller will
 360          * start the transfer when it gets enabled.
 361          */
 362         if (cpu_is_omap1510() || !lcd_dma.ext_ctrl)
 363                 return;
 364
 365         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 366         w |= 1 << 8;
 367         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 368
 369         lcd_dma.active = 1;
 370
 371         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 372         w |= 1 << 7;
 373         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 374 }
 375 EXPORT_SYMBOL(omap_enable_lcd_dma);
 376
 377 void omap_setup_lcd_dma(void)
 378 {
 379         BUG_ON(lcd_dma.active);
 380         if (!cpu_is_omap1510()) {
 381                 /* Set some reasonable defaults */
 382                 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
 383                 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
 384                 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
 385         }
 386         set_b1_regs();
 387         if (!cpu_is_omap1510()) {
 388                 u16 w;
 389
 390                 w = omap_readw(OMAP1610_DMA_LCD_CCR);
 391                 /*
 392                  * If DMA was already active set the end_prog bit to have
 393                  * the programmed register set loaded into the active
 394                  * register set.
 395                  */
 396                 w |= 1 << 11;           /* End_prog */
 397                 if (!lcd_dma.single_transfer)
 398                         w |= (3 << 8);  /* Auto_init, repeat */
 399                 omap_writew(w, OMAP1610_DMA_LCD_CCR);
 400         }
 401 }
 402 EXPORT_SYMBOL(omap_setup_lcd_dma);
 403
 404 void omap_stop_lcd_dma(void)
 405 {
 406         u16 w;
 407
 408         lcd_dma.active = 0;
 409         if (cpu_is_omap1510() || !lcd_dma.ext_ctrl)
 410                 return;
 411
 412         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 413         w &= ~(1 << 7);
 414         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 415
 416         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 417         w &= ~(1 << 8);
 418         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 419 }
 420 EXPORT_SYMBOL(omap_stop_lcd_dma);
 421
 422 static int __init omap_init_lcd_dma(void)
 423 {
 424         int r;
 425
 426         if (cpu_is_omap16xx()) {
 427                 u16 w;
 428
 429                 /* this would prevent OMAP sleep */
 430                 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 431                 w &= ~(1 << 8);
 432                 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 433         }
 434
 435         spin_lock_init(&lcd_dma.lock);
 436
 437         r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
 438                         "LCD DMA", NULL);
 439         if (r != 0)
 440                 printk(KERN_ERR "unable to request IRQ for LCD DMA "
 441                                "(error %d)\n", r);
 442
 443         return r;
 444 }
 445
 446 arch_initcall(omap_init_lcd_dma);
 447