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