kernel/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 <linux/omap-dma.h>
  31
  32 #include <mach/hardware.h>
  33 #include <mach/lcdc.h>
  34
  35 int omap_lcd_dma_running(void)
  36 {
  37         /*
  38          * On OMAP1510, internal LCD controller will start the transfer
  39          * when it gets enabled, so assume DMA running if LCD enabled.
  40          */
  41         if (cpu_is_omap15xx())
  42                 if (omap_readw(OMAP_LCDC_CONTROL) & OMAP_LCDC_CTRL_LCD_EN)
  43                         return 1;
  44
  45         /* Check if LCD DMA is running */
  46         if (cpu_is_omap16xx())
  47                 if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
  48                         return 1;
  49
  50         return 0;
  51 }
  52
  53 static struct lcd_dma_info {
  54         spinlock_t lock;
  55         int reserved;
  56         void (*callback)(u16 status, void *data);
  57         void *cb_data;
  58
  59         int active;
  60         unsigned long addr;
  61         int rotate, data_type, xres, yres;
  62         int vxres;
  63         int mirror;
  64         int xscale, yscale;
  65         int ext_ctrl;
  66         int src_port;
  67         int single_transfer;
  68 } lcd_dma;
  69
  70 void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
  71                          int data_type)
  72 {
  73         lcd_dma.addr = addr;
  74         lcd_dma.data_type = data_type;
  75         lcd_dma.xres = fb_xres;
  76         lcd_dma.yres = fb_yres;
  77 }
  78 EXPORT_SYMBOL(omap_set_lcd_dma_b1);
  79
  80 void omap_set_lcd_dma_ext_controller(int external)
  81 {
  82         lcd_dma.ext_ctrl = external;
  83 }
  84 EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
  85
  86 void omap_set_lcd_dma_single_transfer(int single)
  87 {
  88         lcd_dma.single_transfer = single;
  89 }
  90 EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
  91
  92 void omap_set_lcd_dma_b1_rotation(int rotate)
  93 {
  94         if (cpu_is_omap15xx()) {
  95                 printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
  96                 BUG();
  97                 return;
  98         }
  99         lcd_dma.rotate = rotate;
 100 }
 101 EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
 102
 103 void omap_set_lcd_dma_b1_mirror(int mirror)
 104 {
 105         if (cpu_is_omap15xx()) {
 106                 printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
 107                 BUG();
 108         }
 109         lcd_dma.mirror = mirror;
 110 }
 111 EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
 112
 113 void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
 114 {
 115         if (cpu_is_omap15xx()) {
 116                 pr_err("DMA virtual resolution is not supported in 1510 mode\n");
 117                 BUG();
 118         }
 119         lcd_dma.vxres = vxres;
 120 }
 121 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
 122
 123 void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
 124 {
 125         if (cpu_is_omap15xx()) {
 126                 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
 127                 BUG();
 128         }
 129         lcd_dma.xscale = xscale;
 130         lcd_dma.yscale = yscale;
 131 }
 132 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
 133
 134 static void set_b1_regs(void)
 135 {
 136         unsigned long top, bottom;
 137         int es;
 138         u16 w;
 139         unsigned long en, fn;
 140         long ei, fi;
 141         unsigned long vxres;
 142         unsigned int xscale, yscale;
 143
 144         switch (lcd_dma.data_type) {
 145         case OMAP_DMA_DATA_TYPE_S8:
 146                 es = 1;
 147                 break;
 148         case OMAP_DMA_DATA_TYPE_S16:
 149                 es = 2;
 150                 break;
 151         case OMAP_DMA_DATA_TYPE_S32:
 152                 es = 4;
 153                 break;
 154         default:
 155                 BUG();
 156                 return;
 157         }
 158
 159         vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
 160         xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
 161         yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
 162         BUG_ON(vxres < lcd_dma.xres);
 163
 164 #define PIXADDR(x, y) (lcd_dma.addr +                                   \
 165                 ((y) * vxres * yscale + (x) * xscale) * es)
 166 #define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
 167
 168         switch (lcd_dma.rotate) {
 169         case 0:
 170                 if (!lcd_dma.mirror) {
 171                         top = PIXADDR(0, 0);
 172                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 173                         /* 1510 DMA requires the bottom address to be 2 more
 174                          * than the actual last memory access location. */
 175                         if (cpu_is_omap15xx() &&
 176                                 lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
 177                                         bottom += 2;
 178                         ei = PIXSTEP(0, 0, 1, 0);
 179                         fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
 180                 } else {
 181                         top = PIXADDR(lcd_dma.xres - 1, 0);
 182                         bottom = PIXADDR(0, lcd_dma.yres - 1);
 183                         ei = PIXSTEP(1, 0, 0, 0);
 184                         fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
 185                 }
 186                 en = lcd_dma.xres;
 187                 fn = lcd_dma.yres;
 188                 break;
 189         case 90:
 190                 if (!lcd_dma.mirror) {
 191                         top = PIXADDR(0, lcd_dma.yres - 1);
 192                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
 193                         ei = PIXSTEP(0, 1, 0, 0);
 194                         fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
 195                 } else {
 196                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 197                         bottom = PIXADDR(0, 0);
 198                         ei = PIXSTEP(0, 1, 0, 0);
 199                         fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
 200                 }
 201                 en = lcd_dma.yres;
 202                 fn = lcd_dma.xres;
 203                 break;
 204         case 180:
 205                 if (!lcd_dma.mirror) {
 206                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 207                         bottom = PIXADDR(0, 0);
 208                         ei = PIXSTEP(1, 0, 0, 0);
 209                         fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
 210                 } else {
 211                         top = PIXADDR(0, lcd_dma.yres - 1);
 212                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
 213                         ei = PIXSTEP(0, 0, 1, 0);
 214                         fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
 215                 }
 216                 en = lcd_dma.xres;
 217                 fn = lcd_dma.yres;
 218                 break;
 219         case 270:
 220                 if (!lcd_dma.mirror) {
 221                         top = PIXADDR(lcd_dma.xres - 1, 0);
 222                         bottom = PIXADDR(0, lcd_dma.yres - 1);
 223                         ei = PIXSTEP(0, 0, 0, 1);
 224                         fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
 225                 } else {
 226                         top = PIXADDR(0, 0);
 227                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 228                         ei = PIXSTEP(0, 0, 0, 1);
 229                         fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
 230                 }
 231                 en = lcd_dma.yres;
 232                 fn = lcd_dma.xres;
 233                 break;
 234         default:
 235                 BUG();
 236                 return; /* Suppress warning about uninitialized vars */
 237         }
 238
 239         if (cpu_is_omap15xx()) {
 240                 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
 241                 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
 242                 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
 243                 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
 244
 245                 return;
 246         }
 247
 248         /* 1610 regs */
 249         omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
 250         omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
 251         omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
 252         omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
 253
 254         omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
 255         omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
 256
 257         w = omap_readw(OMAP1610_DMA_LCD_CSDP);
 258         w &= ~0x03;
 259         w |= lcd_dma.data_type;
 260         omap_writew(w, OMAP1610_DMA_LCD_CSDP);
 261
 262         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 263         /* Always set the source port as SDRAM for now*/
 264         w &= ~(0x03 << 6);
 265         if (lcd_dma.callback != NULL)
 266                 w |= 1 << 1;            /* Block interrupt enable */
 267         else
 268                 w &= ~(1 << 1);
 269         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 270
 271         if (!(lcd_dma.rotate || lcd_dma.mirror ||
 272               lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
 273                 return;
 274
 275         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 276         /* Set the double-indexed addressing mode */
 277         w |= (0x03 << 12);
 278         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 279
 280         omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
 281         omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
 282         omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
 283 }
 284
 285 static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id)
 286 {
 287         u16 w;
 288
 289         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 290         if (unlikely(!(w & (1 << 3)))) {
 291                 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
 292                 return IRQ_NONE;
 293         }
 294         /* Ack the IRQ */
 295         w |= (1 << 3);
 296         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 297         lcd_dma.active = 0;
 298         if (lcd_dma.callback != NULL)
 299                 lcd_dma.callback(w, lcd_dma.cb_data);
 300
 301         return IRQ_HANDLED;
 302 }
 303
 304 int omap_request_lcd_dma(void (*callback)(u16 status, void *data),
 305                          void *data)
 306 {
 307         spin_lock_irq(&lcd_dma.lock);
 308         if (lcd_dma.reserved) {
 309                 spin_unlock_irq(&lcd_dma.lock);
 310                 printk(KERN_ERR "LCD DMA channel already reserved\n");
 311                 BUG();
 312                 return -EBUSY;
 313         }
 314         lcd_dma.reserved = 1;
 315         spin_unlock_irq(&lcd_dma.lock);
 316         lcd_dma.callback = callback;
 317         lcd_dma.cb_data = data;
 318         lcd_dma.active = 0;
 319         lcd_dma.single_transfer = 0;
 320         lcd_dma.rotate = 0;
 321         lcd_dma.vxres = 0;
 322         lcd_dma.mirror = 0;
 323         lcd_dma.xscale = 0;
 324         lcd_dma.yscale = 0;
 325         lcd_dma.ext_ctrl = 0;
 326         lcd_dma.src_port = 0;
 327
 328         return 0;
 329 }
 330 EXPORT_SYMBOL(omap_request_lcd_dma);
 331
 332 void omap_free_lcd_dma(void)
 333 {
 334         spin_lock(&lcd_dma.lock);
 335         if (!lcd_dma.reserved) {
 336                 spin_unlock(&lcd_dma.lock);
 337                 printk(KERN_ERR "LCD DMA is not reserved\n");
 338                 BUG();
 339                 return;
 340         }
 341         if (!cpu_is_omap15xx())
 342                 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
 343                             OMAP1610_DMA_LCD_CCR);
 344         lcd_dma.reserved = 0;
 345         spin_unlock(&lcd_dma.lock);
 346 }
 347 EXPORT_SYMBOL(omap_free_lcd_dma);
 348
 349 void omap_enable_lcd_dma(void)
 350 {
 351         u16 w;
 352
 353         /*
 354          * Set the Enable bit only if an external controller is
 355          * connected. Otherwise the OMAP internal controller will
 356          * start the transfer when it gets enabled.
 357          */
 358         if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
 359                 return;
 360
 361         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 362         w |= 1 << 8;
 363         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 364
 365         lcd_dma.active = 1;
 366
 367         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 368         w |= 1 << 7;
 369         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 370 }
 371 EXPORT_SYMBOL(omap_enable_lcd_dma);
 372
 373 void omap_setup_lcd_dma(void)
 374 {
 375         BUG_ON(lcd_dma.active);
 376         if (!cpu_is_omap15xx()) {
 377                 /* Set some reasonable defaults */
 378                 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
 379                 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
 380                 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
 381         }
 382         set_b1_regs();
 383         if (!cpu_is_omap15xx()) {
 384                 u16 w;
 385
 386                 w = omap_readw(OMAP1610_DMA_LCD_CCR);
 387                 /*
 388                  * If DMA was already active set the end_prog bit to have
 389                  * the programmed register set loaded into the active
 390                  * register set.
 391                  */
 392                 w |= 1 << 11;           /* End_prog */
 393                 if (!lcd_dma.single_transfer)
 394                         w |= (3 << 8);  /* Auto_init, repeat */
 395                 omap_writew(w, OMAP1610_DMA_LCD_CCR);
 396         }
 397 }
 398 EXPORT_SYMBOL(omap_setup_lcd_dma);
 399
 400 void omap_stop_lcd_dma(void)
 401 {
 402         u16 w;
 403
 404         lcd_dma.active = 0;
 405         if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
 406                 return;
 407
 408         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 409         w &= ~(1 << 7);
 410         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 411
 412         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 413         w &= ~(1 << 8);
 414         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 415 }
 416 EXPORT_SYMBOL(omap_stop_lcd_dma);
 417
 418 static int __init omap_init_lcd_dma(void)
 419 {
 420         int r;
 421
 422         if (!cpu_class_is_omap1())
 423                 return -ENODEV;
 424
 425         if (cpu_is_omap16xx()) {
 426                 u16 w;
 427
 428                 /* this would prevent OMAP sleep */
 429                 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 430                 w &= ~(1 << 8);
 431                 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 432         }
 433
 434         spin_lock_init(&lcd_dma.lock);
 435
 436         r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
 437                         "LCD DMA", NULL);
 438         if (r != 0)
 439                 pr_err("unable to request IRQ for LCD DMA (error %d)\n", r);
 440
 441         return r;
 442 }
 443
 444 arch_initcall(omap_init_lcd_dma);
 445