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 #include "dma.h"
  36
  37 int omap_lcd_dma_running(void)
  38 {
  39         /*
  40          * On OMAP1510, internal LCD controller will start the transfer
  41          * when it gets enabled, so assume DMA running if LCD enabled.
  42          */
  43         if (cpu_is_omap15xx())
  44                 if (omap_readw(OMAP_LCDC_CONTROL) & OMAP_LCDC_CTRL_LCD_EN)
  45                         return 1;
  46
  47         /* Check if LCD DMA is running */
  48         if (cpu_is_omap16xx())
  49                 if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
  50                         return 1;
  51
  52         return 0;
  53 }
  54
  55 static struct lcd_dma_info {
  56         spinlock_t lock;
  57         int reserved;
  58         void (*callback)(u16 status, void *data);
  59         void *cb_data;
  60
  61         int active;
  62         unsigned long addr;
  63         int rotate, data_type, xres, yres;
  64         int vxres;
  65         int mirror;
  66         int xscale, yscale;
  67         int ext_ctrl;
  68         int src_port;
  69         int single_transfer;
  70 } lcd_dma;
  71
  72 void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
  73                          int data_type)
  74 {
  75         lcd_dma.addr = addr;
  76         lcd_dma.data_type = data_type;
  77         lcd_dma.xres = fb_xres;
  78         lcd_dma.yres = fb_yres;
  79 }
  80 EXPORT_SYMBOL(omap_set_lcd_dma_b1);
  81
  82 void omap_set_lcd_dma_ext_controller(int external)
  83 {
  84         lcd_dma.ext_ctrl = external;
  85 }
  86 EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
  87
  88 void omap_set_lcd_dma_single_transfer(int single)
  89 {
  90         lcd_dma.single_transfer = single;
  91 }
  92 EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
  93
  94 void omap_set_lcd_dma_b1_rotation(int rotate)
  95 {
  96         if (cpu_is_omap15xx()) {
  97                 printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
  98                 BUG();
  99                 return;
 100         }
 101         lcd_dma.rotate = rotate;
 102 }
 103 EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
 104
 105 void omap_set_lcd_dma_b1_mirror(int mirror)
 106 {
 107         if (cpu_is_omap15xx()) {
 108                 printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
 109                 BUG();
 110         }
 111         lcd_dma.mirror = mirror;
 112 }
 113 EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
 114
 115 void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
 116 {
 117         if (cpu_is_omap15xx()) {
 118                 pr_err("DMA virtual resolution is not supported in 1510 mode\n");
 119                 BUG();
 120         }
 121         lcd_dma.vxres = vxres;
 122 }
 123 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
 124
 125 void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
 126 {
 127         if (cpu_is_omap15xx()) {
 128                 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
 129                 BUG();
 130         }
 131         lcd_dma.xscale = xscale;
 132         lcd_dma.yscale = yscale;
 133 }
 134 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
 135
 136 static void set_b1_regs(void)
 137 {
 138         unsigned long top, bottom;
 139         int es;
 140         u16 w;
 141         unsigned long en, fn;
 142         long ei, fi;
 143         unsigned long vxres;
 144         unsigned int xscale, yscale;
 145
 146         switch (lcd_dma.data_type) {
 147         case OMAP_DMA_DATA_TYPE_S8:
 148                 es = 1;
 149                 break;
 150         case OMAP_DMA_DATA_TYPE_S16:
 151                 es = 2;
 152                 break;
 153         case OMAP_DMA_DATA_TYPE_S32:
 154                 es = 4;
 155                 break;
 156         default:
 157                 BUG();
 158                 return;
 159         }
 160
 161         vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
 162         xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
 163         yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
 164         BUG_ON(vxres < lcd_dma.xres);
 165
 166 #define PIXADDR(x, y) (lcd_dma.addr +                                   \
 167                 ((y) * vxres * yscale + (x) * xscale) * es)
 168 #define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
 169
 170         switch (lcd_dma.rotate) {
 171         case 0:
 172                 if (!lcd_dma.mirror) {
 173                         top = PIXADDR(0, 0);
 174                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 175                         /* 1510 DMA requires the bottom address to be 2 more
 176                          * than the actual last memory access location. */
 177                         if (cpu_is_omap15xx() &&
 178                                 lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
 179                                         bottom += 2;
 180                         ei = PIXSTEP(0, 0, 1, 0);
 181                         fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
 182                 } else {
 183                         top = PIXADDR(lcd_dma.xres - 1, 0);
 184                         bottom = PIXADDR(0, lcd_dma.yres - 1);
 185                         ei = PIXSTEP(1, 0, 0, 0);
 186                         fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
 187                 }
 188                 en = lcd_dma.xres;
 189                 fn = lcd_dma.yres;
 190                 break;
 191         case 90:
 192                 if (!lcd_dma.mirror) {
 193                         top = PIXADDR(0, lcd_dma.yres - 1);
 194                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
 195                         ei = PIXSTEP(0, 1, 0, 0);
 196                         fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
 197                 } else {
 198                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 199                         bottom = PIXADDR(0, 0);
 200                         ei = PIXSTEP(0, 1, 0, 0);
 201                         fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
 202                 }
 203                 en = lcd_dma.yres;
 204                 fn = lcd_dma.xres;
 205                 break;
 206         case 180:
 207                 if (!lcd_dma.mirror) {
 208                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 209                         bottom = PIXADDR(0, 0);
 210                         ei = PIXSTEP(1, 0, 0, 0);
 211                         fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
 212                 } else {
 213                         top = PIXADDR(0, lcd_dma.yres - 1);
 214                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
 215                         ei = PIXSTEP(0, 0, 1, 0);
 216                         fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
 217                 }
 218                 en = lcd_dma.xres;
 219                 fn = lcd_dma.yres;
 220                 break;
 221         case 270:
 222                 if (!lcd_dma.mirror) {
 223                         top = PIXADDR(lcd_dma.xres - 1, 0);
 224                         bottom = PIXADDR(0, lcd_dma.yres - 1);
 225                         ei = PIXSTEP(0, 0, 0, 1);
 226                         fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
 227                 } else {
 228                         top = PIXADDR(0, 0);
 229                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 230                         ei = PIXSTEP(0, 0, 0, 1);
 231                         fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
 232                 }
 233                 en = lcd_dma.yres;
 234                 fn = lcd_dma.xres;
 235                 break;
 236         default:
 237                 BUG();
 238                 return; /* Suppress warning about uninitialized vars */
 239         }
 240
 241         if (cpu_is_omap15xx()) {
 242                 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
 243                 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
 244                 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
 245                 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
 246
 247                 return;
 248         }
 249
 250         /* 1610 regs */
 251         omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
 252         omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
 253         omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
 254         omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
 255
 256         omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
 257         omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
 258
 259         w = omap_readw(OMAP1610_DMA_LCD_CSDP);
 260         w &= ~0x03;
 261         w |= lcd_dma.data_type;
 262         omap_writew(w, OMAP1610_DMA_LCD_CSDP);
 263
 264         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 265         /* Always set the source port as SDRAM for now*/
 266         w &= ~(0x03 << 6);
 267         if (lcd_dma.callback != NULL)
 268                 w |= 1 << 1;            /* Block interrupt enable */
 269         else
 270                 w &= ~(1 << 1);
 271         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 272
 273         if (!(lcd_dma.rotate || lcd_dma.mirror ||
 274               lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
 275                 return;
 276
 277         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 278         /* Set the double-indexed addressing mode */
 279         w |= (0x03 << 12);
 280         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 281
 282         omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
 283         omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
 284         omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
 285 }
 286
 287 static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id)
 288 {
 289         u16 w;
 290
 291         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 292         if (unlikely(!(w & (1 << 3)))) {
 293                 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
 294                 return IRQ_NONE;
 295         }
 296         /* Ack the IRQ */
 297         w |= (1 << 3);
 298         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 299         lcd_dma.active = 0;
 300         if (lcd_dma.callback != NULL)
 301                 lcd_dma.callback(w, lcd_dma.cb_data);
 302
 303         return IRQ_HANDLED;
 304 }
 305
 306 int omap_request_lcd_dma(void (*callback)(u16 status, void *data),
 307                          void *data)
 308 {
 309         spin_lock_irq(&lcd_dma.lock);
 310         if (lcd_dma.reserved) {
 311                 spin_unlock_irq(&lcd_dma.lock);
 312                 printk(KERN_ERR "LCD DMA channel already reserved\n");
 313                 BUG();
 314                 return -EBUSY;
 315         }
 316         lcd_dma.reserved = 1;
 317         spin_unlock_irq(&lcd_dma.lock);
 318         lcd_dma.callback = callback;
 319         lcd_dma.cb_data = data;
 320         lcd_dma.active = 0;
 321         lcd_dma.single_transfer = 0;
 322         lcd_dma.rotate = 0;
 323         lcd_dma.vxres = 0;
 324         lcd_dma.mirror = 0;
 325         lcd_dma.xscale = 0;
 326         lcd_dma.yscale = 0;
 327         lcd_dma.ext_ctrl = 0;
 328         lcd_dma.src_port = 0;
 329
 330         return 0;
 331 }
 332 EXPORT_SYMBOL(omap_request_lcd_dma);
 333
 334 void omap_free_lcd_dma(void)
 335 {
 336         spin_lock(&lcd_dma.lock);
 337         if (!lcd_dma.reserved) {
 338                 spin_unlock(&lcd_dma.lock);
 339                 printk(KERN_ERR "LCD DMA is not reserved\n");
 340                 BUG();
 341                 return;
 342         }
 343         if (!cpu_is_omap15xx())
 344                 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
 345                             OMAP1610_DMA_LCD_CCR);
 346         lcd_dma.reserved = 0;
 347         spin_unlock(&lcd_dma.lock);
 348 }
 349 EXPORT_SYMBOL(omap_free_lcd_dma);
 350
 351 void omap_enable_lcd_dma(void)
 352 {
 353         u16 w;
 354
 355         /*
 356          * Set the Enable bit only if an external controller is
 357          * connected. Otherwise the OMAP internal controller will
 358          * start the transfer when it gets enabled.
 359          */
 360         if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
 361                 return;
 362
 363         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 364         w |= 1 << 8;
 365         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 366
 367         lcd_dma.active = 1;
 368
 369         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 370         w |= 1 << 7;
 371         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 372 }
 373 EXPORT_SYMBOL(omap_enable_lcd_dma);
 374
 375 void omap_setup_lcd_dma(void)
 376 {
 377         BUG_ON(lcd_dma.active);
 378         if (!cpu_is_omap15xx()) {
 379                 /* Set some reasonable defaults */
 380                 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
 381                 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
 382                 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
 383         }
 384         set_b1_regs();
 385         if (!cpu_is_omap15xx()) {
 386                 u16 w;
 387
 388                 w = omap_readw(OMAP1610_DMA_LCD_CCR);
 389                 /*
 390                  * If DMA was already active set the end_prog bit to have
 391                  * the programmed register set loaded into the active
 392                  * register set.
 393                  */
 394                 w |= 1 << 11;           /* End_prog */
 395                 if (!lcd_dma.single_transfer)
 396                         w |= (3 << 8);  /* Auto_init, repeat */
 397                 omap_writew(w, OMAP1610_DMA_LCD_CCR);
 398         }
 399 }
 400 EXPORT_SYMBOL(omap_setup_lcd_dma);
 401
 402 void omap_stop_lcd_dma(void)
 403 {
 404         u16 w;
 405
 406         lcd_dma.active = 0;
 407         if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
 408                 return;
 409
 410         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 411         w &= ~(1 << 7);
 412         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 413
 414         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 415         w &= ~(1 << 8);
 416         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 417 }
 418 EXPORT_SYMBOL(omap_stop_lcd_dma);
 419
 420 static int __init omap_init_lcd_dma(void)
 421 {
 422         int r;
 423
 424         if (!cpu_class_is_omap1())
 425                 return -ENODEV;
 426
 427         if (cpu_is_omap16xx()) {
 428                 u16 w;
 429
 430                 /* this would prevent OMAP sleep */
 431                 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 432                 w &= ~(1 << 8);
 433                 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 434         }
 435
 436         spin_lock_init(&lcd_dma.lock);
 437
 438         r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
 439                         "LCD DMA", NULL);
 440         if (r != 0)
 441                 pr_err("unable to request IRQ for LCD DMA (error %d)\n", r);
 442
 443         return r;
 444 }
 445
 446 arch_initcall(omap_init_lcd_dma);
 447