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 <plat/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                 printk(KERN_ERR "DMA virtual resolution is not supported "
 117                                 "in 1510 mode\n");
 118                 BUG();
 119         }
 120         lcd_dma.vxres = vxres;
 121 }
 122 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
 123
 124 void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
 125 {
 126         if (cpu_is_omap15xx()) {
 127                 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
 128                 BUG();
 129         }
 130         lcd_dma.xscale = xscale;
 131         lcd_dma.yscale = yscale;
 132 }
 133 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
 134
 135 static void set_b1_regs(void)
 136 {
 137         unsigned long top, bottom;
 138         int es;
 139         u16 w;
 140         unsigned long en, fn;
 141         long ei, fi;
 142         unsigned long vxres;
 143         unsigned int xscale, yscale;
 144
 145         switch (lcd_dma.data_type) {
 146         case OMAP_DMA_DATA_TYPE_S8:
 147                 es = 1;
 148                 break;
 149         case OMAP_DMA_DATA_TYPE_S16:
 150                 es = 2;
 151                 break;
 152         case OMAP_DMA_DATA_TYPE_S32:
 153                 es = 4;
 154                 break;
 155         default:
 156                 BUG();
 157                 return;
 158         }
 159
 160         vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
 161         xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
 162         yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
 163         BUG_ON(vxres < lcd_dma.xres);
 164
 165 #define PIXADDR(x, y) (lcd_dma.addr +                                   \
 166                 ((y) * vxres * yscale + (x) * xscale) * es)
 167 #define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
 168
 169         switch (lcd_dma.rotate) {
 170         case 0:
 171                 if (!lcd_dma.mirror) {
 172                         top = PIXADDR(0, 0);
 173                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 174                         /* 1510 DMA requires the bottom address to be 2 more
 175                          * than the actual last memory access location. */
 176                         if (cpu_is_omap15xx() &&
 177                                 lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
 178                                         bottom += 2;
 179                         ei = PIXSTEP(0, 0, 1, 0);
 180                         fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
 181                 } else {
 182                         top = PIXADDR(lcd_dma.xres - 1, 0);
 183                         bottom = PIXADDR(0, lcd_dma.yres - 1);
 184                         ei = PIXSTEP(1, 0, 0, 0);
 185                         fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
 186                 }
 187                 en = lcd_dma.xres;
 188                 fn = lcd_dma.yres;
 189                 break;
 190         case 90:
 191                 if (!lcd_dma.mirror) {
 192                         top = PIXADDR(0, lcd_dma.yres - 1);
 193                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
 194                         ei = PIXSTEP(0, 1, 0, 0);
 195                         fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
 196                 } else {
 197                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 198                         bottom = PIXADDR(0, 0);
 199                         ei = PIXSTEP(0, 1, 0, 0);
 200                         fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
 201                 }
 202                 en = lcd_dma.yres;
 203                 fn = lcd_dma.xres;
 204                 break;
 205         case 180:
 206                 if (!lcd_dma.mirror) {
 207                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 208                         bottom = PIXADDR(0, 0);
 209                         ei = PIXSTEP(1, 0, 0, 0);
 210                         fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
 211                 } else {
 212                         top = PIXADDR(0, lcd_dma.yres - 1);
 213                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
 214                         ei = PIXSTEP(0, 0, 1, 0);
 215                         fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
 216                 }
 217                 en = lcd_dma.xres;
 218                 fn = lcd_dma.yres;
 219                 break;
 220         case 270:
 221                 if (!lcd_dma.mirror) {
 222                         top = PIXADDR(lcd_dma.xres - 1, 0);
 223                         bottom = PIXADDR(0, lcd_dma.yres - 1);
 224                         ei = PIXSTEP(0, 0, 0, 1);
 225                         fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
 226                 } else {
 227                         top = PIXADDR(0, 0);
 228                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 229                         ei = PIXSTEP(0, 0, 0, 1);
 230                         fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
 231                 }
 232                 en = lcd_dma.yres;
 233                 fn = lcd_dma.xres;
 234                 break;
 235         default:
 236                 BUG();
 237                 return; /* Suppress warning about uninitialized vars */
 238         }
 239
 240         if (cpu_is_omap15xx()) {
 241                 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
 242                 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
 243                 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
 244                 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
 245
 246                 return;
 247         }
 248
 249         /* 1610 regs */
 250         omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
 251         omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
 252         omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
 253         omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
 254
 255         omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
 256         omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
 257
 258         w = omap_readw(OMAP1610_DMA_LCD_CSDP);
 259         w &= ~0x03;
 260         w |= lcd_dma.data_type;
 261         omap_writew(w, OMAP1610_DMA_LCD_CSDP);
 262
 263         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 264         /* Always set the source port as SDRAM for now*/
 265         w &= ~(0x03 << 6);
 266         if (lcd_dma.callback != NULL)
 267                 w |= 1 << 1;            /* Block interrupt enable */
 268         else
 269                 w &= ~(1 << 1);
 270         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 271
 272         if (!(lcd_dma.rotate || lcd_dma.mirror ||
 273               lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
 274                 return;
 275
 276         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 277         /* Set the double-indexed addressing mode */
 278         w |= (0x03 << 12);
 279         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 280
 281         omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
 282         omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
 283         omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
 284 }
 285
 286 static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id)
 287 {
 288         u16 w;
 289
 290         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 291         if (unlikely(!(w & (1 << 3)))) {
 292                 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
 293                 return IRQ_NONE;
 294         }
 295         /* Ack the IRQ */
 296         w |= (1 << 3);
 297         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 298         lcd_dma.active = 0;
 299         if (lcd_dma.callback != NULL)
 300                 lcd_dma.callback(w, lcd_dma.cb_data);
 301
 302         return IRQ_HANDLED;
 303 }
 304
 305 int omap_request_lcd_dma(void (*callback)(u16 status, void *data),
 306                          void *data)
 307 {
 308         spin_lock_irq(&lcd_dma.lock);
 309         if (lcd_dma.reserved) {
 310                 spin_unlock_irq(&lcd_dma.lock);
 311                 printk(KERN_ERR "LCD DMA channel already reserved\n");
 312                 BUG();
 313                 return -EBUSY;
 314         }
 315         lcd_dma.reserved = 1;
 316         spin_unlock_irq(&lcd_dma.lock);
 317         lcd_dma.callback = callback;
 318         lcd_dma.cb_data = data;
 319         lcd_dma.active = 0;
 320         lcd_dma.single_transfer = 0;
 321         lcd_dma.rotate = 0;
 322         lcd_dma.vxres = 0;
 323         lcd_dma.mirror = 0;
 324         lcd_dma.xscale = 0;
 325         lcd_dma.yscale = 0;
 326         lcd_dma.ext_ctrl = 0;
 327         lcd_dma.src_port = 0;
 328
 329         return 0;
 330 }
 331 EXPORT_SYMBOL(omap_request_lcd_dma);
 332
 333 void omap_free_lcd_dma(void)
 334 {
 335         spin_lock(&lcd_dma.lock);
 336         if (!lcd_dma.reserved) {
 337                 spin_unlock(&lcd_dma.lock);
 338                 printk(KERN_ERR "LCD DMA is not reserved\n");
 339                 BUG();
 340                 return;
 341         }
 342         if (!cpu_is_omap15xx())
 343                 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
 344                             OMAP1610_DMA_LCD_CCR);
 345         lcd_dma.reserved = 0;
 346         spin_unlock(&lcd_dma.lock);
 347 }
 348 EXPORT_SYMBOL(omap_free_lcd_dma);
 349
 350 void omap_enable_lcd_dma(void)
 351 {
 352         u16 w;
 353
 354         /*
 355          * Set the Enable bit only if an external controller is
 356          * connected. Otherwise the OMAP internal controller will
 357          * start the transfer when it gets enabled.
 358          */
 359         if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
 360                 return;
 361
 362         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 363         w |= 1 << 8;
 364         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 365
 366         lcd_dma.active = 1;
 367
 368         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 369         w |= 1 << 7;
 370         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 371 }
 372 EXPORT_SYMBOL(omap_enable_lcd_dma);
 373
 374 void omap_setup_lcd_dma(void)
 375 {
 376         BUG_ON(lcd_dma.active);
 377         if (!cpu_is_omap15xx()) {
 378                 /* Set some reasonable defaults */
 379                 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
 380                 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
 381                 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
 382         }
 383         set_b1_regs();
 384         if (!cpu_is_omap15xx()) {
 385                 u16 w;
 386
 387                 w = omap_readw(OMAP1610_DMA_LCD_CCR);
 388                 /*
 389                  * If DMA was already active set the end_prog bit to have
 390                  * the programmed register set loaded into the active
 391                  * register set.
 392                  */
 393                 w |= 1 << 11;           /* End_prog */
 394                 if (!lcd_dma.single_transfer)
 395                         w |= (3 << 8);  /* Auto_init, repeat */
 396                 omap_writew(w, OMAP1610_DMA_LCD_CCR);
 397         }
 398 }
 399 EXPORT_SYMBOL(omap_setup_lcd_dma);
 400
 401 void omap_stop_lcd_dma(void)
 402 {
 403         u16 w;
 404
 405         lcd_dma.active = 0;
 406         if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
 407                 return;
 408
 409         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 410         w &= ~(1 << 7);
 411         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 412
 413         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 414         w &= ~(1 << 8);
 415         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 416 }
 417 EXPORT_SYMBOL(omap_stop_lcd_dma);
 418
 419 static int __init omap_init_lcd_dma(void)
 420 {
 421         int r;
 422
 423         if (!cpu_class_is_omap1())
 424                 return -ENODEV;
 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