drivers/video/fbdev/omap/lcd_dma.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/arch/arm/mach-omap1/lcd_dma.c
   4  *
   5  * Extracted from arch/arm/plat-omap/dma.c
   6  * Copyright (C) 2003 - 2008 Nokia Corporation
   7  * Author: Juha Yrjölä <juha.yrjola@nokia.com>
   8  * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
   9  * Graphics DMA and LCD DMA graphics tranformations
  10  * by Imre Deak <imre.deak@nokia.com>
  11  * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
  12  * Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
  13  * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
  14  *
  15  * Copyright (C) 2009 Texas Instruments
  16  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  17  *
  18  * Support functions for the OMAP internal DMA channels.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/io.h>
  25
  26 #include <linux/omap-dma.h>
  27
  28 #include <linux/soc/ti/omap1-soc.h>
  29 #include <linux/soc/ti/omap1-io.h>
  30
  31 #include "lcdc.h"
  32 #include "lcd_dma.h"
  33
  34 int omap_lcd_dma_running(void)
  35 {
  36         /*
  37          * On OMAP1510, internal LCD controller will start the transfer
  38          * when it gets enabled, so assume DMA running if LCD enabled.
  39          */
  40         if (cpu_is_omap15xx())
  41                 if (omap_readw(OMAP_LCDC_CONTROL) & OMAP_LCDC_CTRL_LCD_EN)
  42                         return 1;
  43
  44         /* Check if LCD DMA is running */
  45         if (cpu_is_omap16xx())
  46                 if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
  47                         return 1;
  48
  49         return 0;
  50 }
  51
  52 static struct lcd_dma_info {
  53         spinlock_t lock;
  54         int reserved;
  55         void (*callback)(u16 status, void *data);
  56         void *cb_data;
  57
  58         int active;
  59         unsigned long addr;
  60         int rotate, data_type, xres, yres;
  61         int vxres;
  62         int mirror;
  63         int xscale, yscale;
  64         int ext_ctrl;
  65         int src_port;
  66         int single_transfer;
  67 } lcd_dma;
  68
  69 void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
  70                          int data_type)
  71 {
  72         lcd_dma.addr = addr;
  73         lcd_dma.data_type = data_type;
  74         lcd_dma.xres = fb_xres;
  75         lcd_dma.yres = fb_yres;
  76 }
  77 EXPORT_SYMBOL(omap_set_lcd_dma_b1);
  78
  79 void omap_set_lcd_dma_ext_controller(int external)
  80 {
  81         lcd_dma.ext_ctrl = external;
  82 }
  83 EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
  84
  85 void omap_set_lcd_dma_single_transfer(int single)
  86 {
  87         lcd_dma.single_transfer = single;
  88 }
  89 EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
  90
  91 void omap_set_lcd_dma_b1_rotation(int rotate)
  92 {
  93         if (cpu_is_omap15xx()) {
  94                 printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
  95                 BUG();
  96                 return;
  97         }
  98         lcd_dma.rotate = rotate;
  99 }
 100 EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
 101
 102 void omap_set_lcd_dma_b1_mirror(int mirror)
 103 {
 104         if (cpu_is_omap15xx()) {
 105                 printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
 106                 BUG();
 107         }
 108         lcd_dma.mirror = mirror;
 109 }
 110 EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
 111
 112 void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
 113 {
 114         if (cpu_is_omap15xx()) {
 115                 pr_err("DMA virtual resolution is not supported in 1510 mode\n");
 116                 BUG();
 117         }
 118         lcd_dma.vxres = vxres;
 119 }
 120 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
 121
 122 void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
 123 {
 124         if (cpu_is_omap15xx()) {
 125                 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
 126                 BUG();
 127         }
 128         lcd_dma.xscale = xscale;
 129         lcd_dma.yscale = yscale;
 130 }
 131 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
 132
 133 static void set_b1_regs(void)
 134 {
 135         unsigned long top, bottom;
 136         int es;
 137         u16 w;
 138         unsigned long en, fn;
 139         long ei, fi;
 140         unsigned long vxres;
 141         unsigned int xscale, yscale;
 142
 143         switch (lcd_dma.data_type) {
 144         case OMAP_DMA_DATA_TYPE_S8:
 145                 es = 1;
 146                 break;
 147         case OMAP_DMA_DATA_TYPE_S16:
 148                 es = 2;
 149                 break;
 150         case OMAP_DMA_DATA_TYPE_S32:
 151                 es = 4;
 152                 break;
 153         default:
 154                 BUG();
 155                 return;
 156         }
 157
 158         vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
 159         xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
 160         yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
 161         BUG_ON(vxres < lcd_dma.xres);
 162
 163 #define PIXADDR(x, y) (lcd_dma.addr +                                   \
 164                 ((y) * vxres * yscale + (x) * xscale) * es)
 165 #define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
 166
 167         switch (lcd_dma.rotate) {
 168         case 0:
 169                 if (!lcd_dma.mirror) {
 170                         top = PIXADDR(0, 0);
 171                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 172                         /* 1510 DMA requires the bottom address to be 2 more
 173                          * than the actual last memory access location. */
 174                         if (cpu_is_omap15xx() &&
 175                                 lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
 176                                         bottom += 2;
 177                         ei = PIXSTEP(0, 0, 1, 0);
 178                         fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
 179                 } else {
 180                         top = PIXADDR(lcd_dma.xres - 1, 0);
 181                         bottom = PIXADDR(0, lcd_dma.yres - 1);
 182                         ei = PIXSTEP(1, 0, 0, 0);
 183                         fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
 184                 }
 185                 en = lcd_dma.xres;
 186                 fn = lcd_dma.yres;
 187                 break;
 188         case 90:
 189                 if (!lcd_dma.mirror) {
 190                         top = PIXADDR(0, lcd_dma.yres - 1);
 191                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
 192                         ei = PIXSTEP(0, 1, 0, 0);
 193                         fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
 194                 } else {
 195                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 196                         bottom = PIXADDR(0, 0);
 197                         ei = PIXSTEP(0, 1, 0, 0);
 198                         fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
 199                 }
 200                 en = lcd_dma.yres;
 201                 fn = lcd_dma.xres;
 202                 break;
 203         case 180:
 204                 if (!lcd_dma.mirror) {
 205                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 206                         bottom = PIXADDR(0, 0);
 207                         ei = PIXSTEP(1, 0, 0, 0);
 208                         fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
 209                 } else {
 210                         top = PIXADDR(0, lcd_dma.yres - 1);
 211                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
 212                         ei = PIXSTEP(0, 0, 1, 0);
 213                         fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
 214                 }
 215                 en = lcd_dma.xres;
 216                 fn = lcd_dma.yres;
 217                 break;
 218         case 270:
 219                 if (!lcd_dma.mirror) {
 220                         top = PIXADDR(lcd_dma.xres - 1, 0);
 221                         bottom = PIXADDR(0, lcd_dma.yres - 1);
 222                         ei = PIXSTEP(0, 0, 0, 1);
 223                         fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
 224                 } else {
 225                         top = PIXADDR(0, 0);
 226                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
 227                         ei = PIXSTEP(0, 0, 0, 1);
 228                         fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
 229                 }
 230                 en = lcd_dma.yres;
 231                 fn = lcd_dma.xres;
 232                 break;
 233         default:
 234                 BUG();
 235                 return; /* Suppress warning about uninitialized vars */
 236         }
 237
 238         if (cpu_is_omap15xx()) {
 239                 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
 240                 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
 241                 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
 242                 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
 243
 244                 return;
 245         }
 246
 247         /* 1610 regs */
 248         omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
 249         omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
 250         omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
 251         omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
 252
 253         omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
 254         omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
 255
 256         w = omap_readw(OMAP1610_DMA_LCD_CSDP);
 257         w &= ~0x03;
 258         w |= lcd_dma.data_type;
 259         omap_writew(w, OMAP1610_DMA_LCD_CSDP);
 260
 261         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 262         /* Always set the source port as SDRAM for now*/
 263         w &= ~(0x03 << 6);
 264         if (lcd_dma.callback != NULL)
 265                 w |= 1 << 1;            /* Block interrupt enable */
 266         else
 267                 w &= ~(1 << 1);
 268         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 269
 270         if (!(lcd_dma.rotate || lcd_dma.mirror ||
 271               lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
 272                 return;
 273
 274         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 275         /* Set the double-indexed addressing mode */
 276         w |= (0x03 << 12);
 277         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 278
 279         omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
 280         omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
 281         omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
 282 }
 283
 284 static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id)
 285 {
 286         u16 w;
 287
 288         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 289         if (unlikely(!(w & (1 << 3)))) {
 290                 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
 291                 return IRQ_NONE;
 292         }
 293         /* Ack the IRQ */
 294         w |= (1 << 3);
 295         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 296         lcd_dma.active = 0;
 297         if (lcd_dma.callback != NULL)
 298                 lcd_dma.callback(w, lcd_dma.cb_data);
 299
 300         return IRQ_HANDLED;
 301 }
 302
 303 int omap_request_lcd_dma(void (*callback)(u16 status, void *data),
 304                          void *data)
 305 {
 306         spin_lock_irq(&lcd_dma.lock);
 307         if (lcd_dma.reserved) {
 308                 spin_unlock_irq(&lcd_dma.lock);
 309                 printk(KERN_ERR "LCD DMA channel already reserved\n");
 310                 BUG();
 311                 return -EBUSY;
 312         }
 313         lcd_dma.reserved = 1;
 314         spin_unlock_irq(&lcd_dma.lock);
 315         lcd_dma.callback = callback;
 316         lcd_dma.cb_data = data;
 317         lcd_dma.active = 0;
 318         lcd_dma.single_transfer = 0;
 319         lcd_dma.rotate = 0;
 320         lcd_dma.vxres = 0;
 321         lcd_dma.mirror = 0;
 322         lcd_dma.xscale = 0;
 323         lcd_dma.yscale = 0;
 324         lcd_dma.ext_ctrl = 0;
 325         lcd_dma.src_port = 0;
 326
 327         return 0;
 328 }
 329 EXPORT_SYMBOL(omap_request_lcd_dma);
 330
 331 void omap_free_lcd_dma(void)
 332 {
 333         spin_lock(&lcd_dma.lock);
 334         if (!lcd_dma.reserved) {
 335                 spin_unlock(&lcd_dma.lock);
 336                 printk(KERN_ERR "LCD DMA is not reserved\n");
 337                 BUG();
 338                 return;
 339         }
 340         if (!cpu_is_omap15xx())
 341                 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
 342                             OMAP1610_DMA_LCD_CCR);
 343         lcd_dma.reserved = 0;
 344         spin_unlock(&lcd_dma.lock);
 345 }
 346 EXPORT_SYMBOL(omap_free_lcd_dma);
 347
 348 void omap_enable_lcd_dma(void)
 349 {
 350         u16 w;
 351
 352         /*
 353          * Set the Enable bit only if an external controller is
 354          * connected. Otherwise the OMAP internal controller will
 355          * start the transfer when it gets enabled.
 356          */
 357         if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
 358                 return;
 359
 360         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 361         w |= 1 << 8;
 362         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 363
 364         lcd_dma.active = 1;
 365
 366         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 367         w |= 1 << 7;
 368         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 369 }
 370 EXPORT_SYMBOL(omap_enable_lcd_dma);
 371
 372 void omap_setup_lcd_dma(void)
 373 {
 374         BUG_ON(lcd_dma.active);
 375         if (!cpu_is_omap15xx()) {
 376                 /* Set some reasonable defaults */
 377                 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
 378                 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
 379                 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
 380         }
 381         set_b1_regs();
 382         if (!cpu_is_omap15xx()) {
 383                 u16 w;
 384
 385                 w = omap_readw(OMAP1610_DMA_LCD_CCR);
 386                 /*
 387                  * If DMA was already active set the end_prog bit to have
 388                  * the programmed register set loaded into the active
 389                  * register set.
 390                  */
 391                 w |= 1 << 11;           /* End_prog */
 392                 if (!lcd_dma.single_transfer)
 393                         w |= (3 << 8);  /* Auto_init, repeat */
 394                 omap_writew(w, OMAP1610_DMA_LCD_CCR);
 395         }
 396 }
 397 EXPORT_SYMBOL(omap_setup_lcd_dma);
 398
 399 void omap_stop_lcd_dma(void)
 400 {
 401         u16 w;
 402
 403         lcd_dma.active = 0;
 404         if (cpu_is_omap15xx() || !lcd_dma.ext_ctrl)
 405                 return;
 406
 407         w = omap_readw(OMAP1610_DMA_LCD_CCR);
 408         w &= ~(1 << 7);
 409         omap_writew(w, OMAP1610_DMA_LCD_CCR);
 410
 411         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 412         w &= ~(1 << 8);
 413         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 414 }
 415 EXPORT_SYMBOL(omap_stop_lcd_dma);
 416
 417 static int __init omap_init_lcd_dma(void)
 418 {
 419         int r;
 420
 421         if (!cpu_class_is_omap1())
 422                 return -ENODEV;
 423
 424         if (cpu_is_omap16xx()) {
 425                 u16 w;
 426
 427                 /* this would prevent OMAP sleep */
 428                 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
 429                 w &= ~(1 << 8);
 430                 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
 431         }
 432
 433         spin_lock_init(&lcd_dma.lock);
 434
 435         r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
 436                         "LCD DMA", NULL);
 437         if (r != 0)
 438                 pr_err("unable to request IRQ for LCD DMA (error %d)\n", r);
 439
 440         return r;
 441 }
 442
 443 arch_initcall(omap_init_lcd_dma);
 444