arch/arm/mach-omap1/dma.c

   1 /*
   2  * OMAP1/OMAP7xx - specific DMA driver
   3  *
   4  * Copyright (C) 2003 - 2008 Nokia Corporation
   5  * Author: Juha Yrjölä <juha.yrjola@nokia.com>
   6  * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
   7  * Graphics DMA and LCD DMA graphics tranformations
   8  * by Imre Deak <imre.deak@nokia.com>
   9  * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
  10  * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
  11  *
  12  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
  13  * Converted DMA library into platform driver
  14  *                   - G, Manjunath Kondaiah <manjugk@ti.com>
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License version 2 as
  18  * published by the Free Software Foundation.
  19  */
  20
  21 #include <linux/err.h>
  22 #include <linux/slab.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/device.h>
  26 #include <linux/io.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/omap-dma.h>
  29 #include <mach/tc.h>
  30
  31 #include <mach/irqs.h>
  32
  33 #define OMAP1_DMA_BASE                  (0xfffed800)
  34 #define OMAP1_LOGICAL_DMA_CH_COUNT      17
  35 #define OMAP1_DMA_STRIDE                0x40
  36
  37 static u32 errata;
  38 static u32 enable_1510_mode;
  39 static u8 dma_stride;
  40 static enum omap_reg_offsets dma_common_ch_start, dma_common_ch_end;
  41
  42 static u16 reg_map[] = {
  43         [GCR]           = 0x400,
  44         [GSCR]          = 0x404,
  45         [GRST1]         = 0x408,
  46         [HW_ID]         = 0x442,
  47         [PCH2_ID]       = 0x444,
  48         [PCH0_ID]       = 0x446,
  49         [PCH1_ID]       = 0x448,
  50         [PCHG_ID]       = 0x44a,
  51         [PCHD_ID]       = 0x44c,
  52         [CAPS_0]        = 0x44e,
  53         [CAPS_1]        = 0x452,
  54         [CAPS_2]        = 0x456,
  55         [CAPS_3]        = 0x458,
  56         [CAPS_4]        = 0x45a,
  57         [PCH2_SR]       = 0x460,
  58         [PCH0_SR]       = 0x480,
  59         [PCH1_SR]       = 0x482,
  60         [PCHD_SR]       = 0x4c0,
  61
  62         /* Common Registers */
  63         [CSDP]          = 0x00,
  64         [CCR]           = 0x02,
  65         [CICR]          = 0x04,
  66         [CSR]           = 0x06,
  67         [CEN]           = 0x10,
  68         [CFN]           = 0x12,
  69         [CSFI]          = 0x14,
  70         [CSEI]          = 0x16,
  71         [CPC]           = 0x18, /* 15xx only */
  72         [CSAC]          = 0x18,
  73         [CDAC]          = 0x1a,
  74         [CDEI]          = 0x1c,
  75         [CDFI]          = 0x1e,
  76         [CLNK_CTRL]     = 0x28,
  77
  78         /* Channel specific register offsets */
  79         [CSSA]          = 0x08,
  80         [CDSA]          = 0x0c,
  81         [COLOR]         = 0x20,
  82         [CCR2]          = 0x24,
  83         [LCH_CTRL]      = 0x2a,
  84 };
  85
  86 static struct resource res[] __initdata = {
  87         [0] = {
  88                 .start  = OMAP1_DMA_BASE,
  89                 .end    = OMAP1_DMA_BASE + SZ_2K - 1,
  90                 .flags  = IORESOURCE_MEM,
  91         },
  92         [1] = {
  93                 .name   = "0",
  94                 .start  = INT_DMA_CH0_6,
  95                 .flags  = IORESOURCE_IRQ,
  96         },
  97         [2] = {
  98                 .name   = "1",
  99                 .start  = INT_DMA_CH1_7,
 100                 .flags  = IORESOURCE_IRQ,
 101         },
 102         [3] = {
 103                 .name   = "2",
 104                 .start  = INT_DMA_CH2_8,
 105                 .flags  = IORESOURCE_IRQ,
 106         },
 107         [4] = {
 108                 .name   = "3",
 109                 .start  = INT_DMA_CH3,
 110                 .flags  = IORESOURCE_IRQ,
 111         },
 112         [5] = {
 113                 .name   = "4",
 114                 .start  = INT_DMA_CH4,
 115                 .flags  = IORESOURCE_IRQ,
 116         },
 117         [6] = {
 118                 .name   = "5",
 119                 .start  = INT_DMA_CH5,
 120                 .flags  = IORESOURCE_IRQ,
 121         },
 122         /* Handled in lcd_dma.c */
 123         [7] = {
 124                 .name   = "6",
 125                 .start  = INT_1610_DMA_CH6,
 126                 .flags  = IORESOURCE_IRQ,
 127         },
 128         /* irq's for omap16xx and omap7xx */
 129         [8] = {
 130                 .name   = "7",
 131                 .start  = INT_1610_DMA_CH7,
 132                 .flags  = IORESOURCE_IRQ,
 133         },
 134         [9] = {
 135                 .name   = "8",
 136                 .start  = INT_1610_DMA_CH8,
 137                 .flags  = IORESOURCE_IRQ,
 138         },
 139         [10] = {
 140                 .name  = "9",
 141                 .start = INT_1610_DMA_CH9,
 142                 .flags = IORESOURCE_IRQ,
 143         },
 144         [11] = {
 145                 .name  = "10",
 146                 .start = INT_1610_DMA_CH10,
 147                 .flags = IORESOURCE_IRQ,
 148         },
 149         [12] = {
 150                 .name  = "11",
 151                 .start = INT_1610_DMA_CH11,
 152                 .flags = IORESOURCE_IRQ,
 153         },
 154         [13] = {
 155                 .name  = "12",
 156                 .start = INT_1610_DMA_CH12,
 157                 .flags = IORESOURCE_IRQ,
 158         },
 159         [14] = {
 160                 .name  = "13",
 161                 .start = INT_1610_DMA_CH13,
 162                 .flags = IORESOURCE_IRQ,
 163         },
 164         [15] = {
 165                 .name  = "14",
 166                 .start = INT_1610_DMA_CH14,
 167                 .flags = IORESOURCE_IRQ,
 168         },
 169         [16] = {
 170                 .name  = "15",
 171                 .start = INT_1610_DMA_CH15,
 172                 .flags = IORESOURCE_IRQ,
 173         },
 174         [17] = {
 175                 .name  = "16",
 176                 .start = INT_DMA_LCD,
 177                 .flags = IORESOURCE_IRQ,
 178         },
 179 };
 180
 181 static void __iomem *dma_base;
 182 static inline void dma_write(u32 val, int reg, int lch)
 183 {
 184         u8  stride;
 185         u32 offset;
 186
 187         stride = (reg >= dma_common_ch_start) ? dma_stride : 0;
 188         offset = reg_map[reg] + (stride * lch);
 189
 190         __raw_writew(val, dma_base + offset);
 191         if ((reg > CLNK_CTRL && reg < CCEN) ||
 192                         (reg > PCHD_ID && reg < CAPS_2)) {
 193                 u32 offset2 = reg_map[reg] + 2 + (stride * lch);
 194                 __raw_writew(val >> 16, dma_base + offset2);
 195         }
 196 }
 197
 198 static inline u32 dma_read(int reg, int lch)
 199 {
 200         u8 stride;
 201         u32 offset, val;
 202
 203         stride = (reg >= dma_common_ch_start) ? dma_stride : 0;
 204         offset = reg_map[reg] + (stride * lch);
 205
 206         val = __raw_readw(dma_base + offset);
 207         if ((reg > CLNK_CTRL && reg < CCEN) ||
 208                         (reg > PCHD_ID && reg < CAPS_2)) {
 209                 u16 upper;
 210                 u32 offset2 = reg_map[reg] + 2 + (stride * lch);
 211                 upper = __raw_readw(dma_base + offset2);
 212                 val |= (upper << 16);
 213         }
 214         return val;
 215 }
 216
 217 static void omap1_clear_lch_regs(int lch)
 218 {
 219         int i = dma_common_ch_start;
 220
 221         for (; i <= dma_common_ch_end; i += 1)
 222                 dma_write(0, i, lch);
 223 }
 224
 225 static void omap1_clear_dma(int lch)
 226 {
 227         u32 l;
 228
 229         l = dma_read(CCR, lch);
 230         l &= ~OMAP_DMA_CCR_EN;
 231         dma_write(l, CCR, lch);
 232
 233         /* Clear pending interrupts */
 234         l = dma_read(CSR, lch);
 235 }
 236
 237 static void omap1_show_dma_caps(void)
 238 {
 239         if (enable_1510_mode) {
 240                 printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
 241         } else {
 242                 u16 w;
 243                 printk(KERN_INFO "OMAP DMA hardware version %d\n",
 244                                                         dma_read(HW_ID, 0));
 245                 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
 246                         dma_read(CAPS_0, 0), dma_read(CAPS_1, 0),
 247                         dma_read(CAPS_2, 0), dma_read(CAPS_3, 0),
 248                         dma_read(CAPS_4, 0));
 249
 250                 /* Disable OMAP 3.0/3.1 compatibility mode. */
 251                 w = dma_read(GSCR, 0);
 252                 w |= 1 << 3;
 253                 dma_write(w, GSCR, 0);
 254         }
 255         return;
 256 }
 257
 258 static u32 configure_dma_errata(void)
 259 {
 260
 261         /*
 262          * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
 263          * read before the DMA controller finished disabling the channel.
 264          */
 265         if (!cpu_is_omap15xx())
 266                 SET_DMA_ERRATA(DMA_ERRATA_3_3);
 267
 268         return errata;
 269 }
 270
 271 static const struct platform_device_info omap_dma_dev_info = {
 272         .name = "omap-dma-engine",
 273         .id = -1,
 274         .dma_mask = DMA_BIT_MASK(32),
 275 };
 276
 277 static int __init omap1_system_dma_init(void)
 278 {
 279         struct omap_system_dma_plat_info        *p;
 280         struct omap_dma_dev_attr                *d;
 281         struct platform_device                  *pdev, *dma_pdev;
 282         int ret;
 283
 284         pdev = platform_device_alloc("omap_dma_system", 0);
 285         if (!pdev) {
 286                 pr_err("%s: Unable to device alloc for dma\n",
 287                         __func__);
 288                 return -ENOMEM;
 289         }
 290
 291         dma_base = ioremap(res[0].start, resource_size(&res[0]));
 292         if (!dma_base) {
 293                 pr_err("%s: Unable to ioremap\n", __func__);
 294                 ret = -ENODEV;
 295                 goto exit_device_put;
 296         }
 297
 298         ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
 299         if (ret) {
 300                 dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
 301                         __func__, pdev->name, pdev->id);
 302                 goto exit_iounmap;
 303         }
 304
 305         p = kzalloc(sizeof(struct omap_system_dma_plat_info), GFP_KERNEL);
 306         if (!p) {
 307                 dev_err(&pdev->dev, "%s: Unable to allocate 'p' for %s\n",
 308                         __func__, pdev->name);
 309                 ret = -ENOMEM;
 310                 goto exit_iounmap;
 311         }
 312
 313         d = kzalloc(sizeof(struct omap_dma_dev_attr), GFP_KERNEL);
 314         if (!d) {
 315                 dev_err(&pdev->dev, "%s: Unable to allocate 'd' for %s\n",
 316                         __func__, pdev->name);
 317                 ret = -ENOMEM;
 318                 goto exit_release_p;
 319         }
 320
 321         d->lch_count            = OMAP1_LOGICAL_DMA_CH_COUNT;
 322
 323         /* Valid attributes for omap1 plus processors */
 324         if (cpu_is_omap15xx())
 325                 d->dev_caps = ENABLE_1510_MODE;
 326         enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
 327
 328         if (cpu_is_omap16xx())
 329                 d->dev_caps = ENABLE_16XX_MODE;
 330
 331         d->dev_caps             |= SRC_PORT;
 332         d->dev_caps             |= DST_PORT;
 333         d->dev_caps             |= SRC_INDEX;
 334         d->dev_caps             |= DST_INDEX;
 335         d->dev_caps             |= IS_BURST_ONLY4;
 336         d->dev_caps             |= CLEAR_CSR_ON_READ;
 337         d->dev_caps             |= IS_WORD_16;
 338
 339
 340         d->chan = kzalloc(sizeof(struct omap_dma_lch) *
 341                                         (d->lch_count), GFP_KERNEL);
 342         if (!d->chan) {
 343                 dev_err(&pdev->dev,
 344                         "%s: Memory allocation failed for d->chan!\n",
 345                         __func__);
 346                 ret = -ENOMEM;
 347                 goto exit_release_d;
 348         }
 349
 350         if (cpu_is_omap15xx())
 351                 d->chan_count = 9;
 352         else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
 353                 if (!(d->dev_caps & ENABLE_1510_MODE))
 354                         d->chan_count = 16;
 355                 else
 356                         d->chan_count = 9;
 357         }
 358
 359         p->dma_attr = d;
 360
 361         p->show_dma_caps        = omap1_show_dma_caps;
 362         p->clear_lch_regs       = omap1_clear_lch_regs;
 363         p->clear_dma            = omap1_clear_dma;
 364         p->dma_write            = dma_write;
 365         p->dma_read             = dma_read;
 366         p->disable_irq_lch      = NULL;
 367
 368         p->errata = configure_dma_errata();
 369
 370         ret = platform_device_add_data(pdev, p, sizeof(*p));
 371         if (ret) {
 372                 dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
 373                         __func__, pdev->name, pdev->id);
 374                 goto exit_release_chan;
 375         }
 376
 377         ret = platform_device_add(pdev);
 378         if (ret) {
 379                 dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
 380                         __func__, pdev->name, pdev->id);
 381                 goto exit_release_chan;
 382         }
 383
 384         dma_stride              = OMAP1_DMA_STRIDE;
 385         dma_common_ch_start     = CPC;
 386         dma_common_ch_end       = COLOR;
 387
 388         dma_pdev = platform_device_register_full(&omap_dma_dev_info);
 389         if (IS_ERR(dma_pdev)) {
 390                 ret = PTR_ERR(dma_pdev);
 391                 goto exit_release_pdev;
 392         }
 393
 394         return ret;
 395
 396 exit_release_pdev:
 397         platform_device_del(pdev);
 398 exit_release_chan:
 399         kfree(d->chan);
 400 exit_release_d:
 401         kfree(d);
 402 exit_release_p:
 403         kfree(p);
 404 exit_iounmap:
 405         iounmap(dma_base);
 406 exit_device_put:
 407         platform_device_put(pdev);
 408
 409         return ret;
 410 }
 411 arch_initcall(omap1_system_dma_init);