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
  36 static u32 enable_1510_mode;
  37
  38 static const struct omap_dma_reg reg_map[] = {
  39         [GCR]           = { 0x0400, 0x00, OMAP_DMA_REG_16BIT },
  40         [GSCR]          = { 0x0404, 0x00, OMAP_DMA_REG_16BIT },
  41         [GRST1]         = { 0x0408, 0x00, OMAP_DMA_REG_16BIT },
  42         [HW_ID]         = { 0x0442, 0x00, OMAP_DMA_REG_16BIT },
  43         [PCH2_ID]       = { 0x0444, 0x00, OMAP_DMA_REG_16BIT },
  44         [PCH0_ID]       = { 0x0446, 0x00, OMAP_DMA_REG_16BIT },
  45         [PCH1_ID]       = { 0x0448, 0x00, OMAP_DMA_REG_16BIT },
  46         [PCHG_ID]       = { 0x044a, 0x00, OMAP_DMA_REG_16BIT },
  47         [PCHD_ID]       = { 0x044c, 0x00, OMAP_DMA_REG_16BIT },
  48         [CAPS_0]        = { 0x044e, 0x00, OMAP_DMA_REG_2X16BIT },
  49         [CAPS_1]        = { 0x0452, 0x00, OMAP_DMA_REG_2X16BIT },
  50         [CAPS_2]        = { 0x0456, 0x00, OMAP_DMA_REG_16BIT },
  51         [CAPS_3]        = { 0x0458, 0x00, OMAP_DMA_REG_16BIT },
  52         [CAPS_4]        = { 0x045a, 0x00, OMAP_DMA_REG_16BIT },
  53         [PCH2_SR]       = { 0x0460, 0x00, OMAP_DMA_REG_16BIT },
  54         [PCH0_SR]       = { 0x0480, 0x00, OMAP_DMA_REG_16BIT },
  55         [PCH1_SR]       = { 0x0482, 0x00, OMAP_DMA_REG_16BIT },
  56         [PCHD_SR]       = { 0x04c0, 0x00, OMAP_DMA_REG_16BIT },
  57
  58         /* Common Registers */
  59         [CSDP]          = { 0x0000, 0x40, OMAP_DMA_REG_16BIT },
  60         [CCR]           = { 0x0002, 0x40, OMAP_DMA_REG_16BIT },
  61         [CICR]          = { 0x0004, 0x40, OMAP_DMA_REG_16BIT },
  62         [CSR]           = { 0x0006, 0x40, OMAP_DMA_REG_16BIT },
  63         [CEN]           = { 0x0010, 0x40, OMAP_DMA_REG_16BIT },
  64         [CFN]           = { 0x0012, 0x40, OMAP_DMA_REG_16BIT },
  65         [CSFI]          = { 0x0014, 0x40, OMAP_DMA_REG_16BIT },
  66         [CSEI]          = { 0x0016, 0x40, OMAP_DMA_REG_16BIT },
  67         [CPC]           = { 0x0018, 0x40, OMAP_DMA_REG_16BIT }, /* 15xx only */
  68         [CSAC]          = { 0x0018, 0x40, OMAP_DMA_REG_16BIT },
  69         [CDAC]          = { 0x001a, 0x40, OMAP_DMA_REG_16BIT },
  70         [CDEI]          = { 0x001c, 0x40, OMAP_DMA_REG_16BIT },
  71         [CDFI]          = { 0x001e, 0x40, OMAP_DMA_REG_16BIT },
  72         [CLNK_CTRL]     = { 0x0028, 0x40, OMAP_DMA_REG_16BIT },
  73
  74         /* Channel specific register offsets */
  75         [CSSA]          = { 0x0008, 0x40, OMAP_DMA_REG_2X16BIT },
  76         [CDSA]          = { 0x000c, 0x40, OMAP_DMA_REG_2X16BIT },
  77         [COLOR]         = { 0x0020, 0x40, OMAP_DMA_REG_2X16BIT },
  78         [CCR2]          = { 0x0024, 0x40, OMAP_DMA_REG_16BIT },
  79         [LCH_CTRL]      = { 0x002a, 0x40, OMAP_DMA_REG_16BIT },
  80 };
  81
  82 static struct resource res[] __initdata = {
  83         [0] = {
  84                 .start  = OMAP1_DMA_BASE,
  85                 .end    = OMAP1_DMA_BASE + SZ_2K - 1,
  86                 .flags  = IORESOURCE_MEM,
  87         },
  88         [1] = {
  89                 .name   = "0",
  90                 .start  = INT_DMA_CH0_6,
  91                 .flags  = IORESOURCE_IRQ,
  92         },
  93         [2] = {
  94                 .name   = "1",
  95                 .start  = INT_DMA_CH1_7,
  96                 .flags  = IORESOURCE_IRQ,
  97         },
  98         [3] = {
  99                 .name   = "2",
 100                 .start  = INT_DMA_CH2_8,
 101                 .flags  = IORESOURCE_IRQ,
 102         },
 103         [4] = {
 104                 .name   = "3",
 105                 .start  = INT_DMA_CH3,
 106                 .flags  = IORESOURCE_IRQ,
 107         },
 108         [5] = {
 109                 .name   = "4",
 110                 .start  = INT_DMA_CH4,
 111                 .flags  = IORESOURCE_IRQ,
 112         },
 113         [6] = {
 114                 .name   = "5",
 115                 .start  = INT_DMA_CH5,
 116                 .flags  = IORESOURCE_IRQ,
 117         },
 118         /* Handled in lcd_dma.c */
 119         [7] = {
 120                 .name   = "6",
 121                 .start  = INT_1610_DMA_CH6,
 122                 .flags  = IORESOURCE_IRQ,
 123         },
 124         /* irq's for omap16xx and omap7xx */
 125         [8] = {
 126                 .name   = "7",
 127                 .start  = INT_1610_DMA_CH7,
 128                 .flags  = IORESOURCE_IRQ,
 129         },
 130         [9] = {
 131                 .name   = "8",
 132                 .start  = INT_1610_DMA_CH8,
 133                 .flags  = IORESOURCE_IRQ,
 134         },
 135         [10] = {
 136                 .name  = "9",
 137                 .start = INT_1610_DMA_CH9,
 138                 .flags = IORESOURCE_IRQ,
 139         },
 140         [11] = {
 141                 .name  = "10",
 142                 .start = INT_1610_DMA_CH10,
 143                 .flags = IORESOURCE_IRQ,
 144         },
 145         [12] = {
 146                 .name  = "11",
 147                 .start = INT_1610_DMA_CH11,
 148                 .flags = IORESOURCE_IRQ,
 149         },
 150         [13] = {
 151                 .name  = "12",
 152                 .start = INT_1610_DMA_CH12,
 153                 .flags = IORESOURCE_IRQ,
 154         },
 155         [14] = {
 156                 .name  = "13",
 157                 .start = INT_1610_DMA_CH13,
 158                 .flags = IORESOURCE_IRQ,
 159         },
 160         [15] = {
 161                 .name  = "14",
 162                 .start = INT_1610_DMA_CH14,
 163                 .flags = IORESOURCE_IRQ,
 164         },
 165         [16] = {
 166                 .name  = "15",
 167                 .start = INT_1610_DMA_CH15,
 168                 .flags = IORESOURCE_IRQ,
 169         },
 170         [17] = {
 171                 .name  = "16",
 172                 .start = INT_DMA_LCD,
 173                 .flags = IORESOURCE_IRQ,
 174         },
 175 };
 176
 177 static void __iomem *dma_base;
 178 static inline void dma_write(u32 val, int reg, int lch)
 179 {
 180         void __iomem *addr = dma_base;
 181
 182         addr += reg_map[reg].offset;
 183         addr += reg_map[reg].stride * lch;
 184
 185         __raw_writew(val, addr);
 186         if (reg_map[reg].type == OMAP_DMA_REG_2X16BIT)
 187                 __raw_writew(val >> 16, addr + 2);
 188 }
 189
 190 static inline u32 dma_read(int reg, int lch)
 191 {
 192         void __iomem *addr = dma_base;
 193         uint32_t val;
 194
 195         addr += reg_map[reg].offset;
 196         addr += reg_map[reg].stride * lch;
 197
 198         val = __raw_readw(addr);
 199         if (reg_map[reg].type == OMAP_DMA_REG_2X16BIT)
 200                 val |= __raw_readw(addr + 2) << 16;
 201
 202         return val;
 203 }
 204
 205 static void omap1_clear_lch_regs(int lch)
 206 {
 207         int i;
 208
 209         for (i = CPC; i <= COLOR; i += 1)
 210                 dma_write(0, i, lch);
 211 }
 212
 213 static void omap1_clear_dma(int lch)
 214 {
 215         u32 l;
 216
 217         l = dma_read(CCR, lch);
 218         l &= ~OMAP_DMA_CCR_EN;
 219         dma_write(l, CCR, lch);
 220
 221         /* Clear pending interrupts */
 222         l = dma_read(CSR, lch);
 223 }
 224
 225 static void omap1_show_dma_caps(void)
 226 {
 227         if (enable_1510_mode) {
 228                 printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
 229         } else {
 230                 u16 w;
 231                 printk(KERN_INFO "OMAP DMA hardware version %d\n",
 232                                                         dma_read(HW_ID, 0));
 233                 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
 234                         dma_read(CAPS_0, 0), dma_read(CAPS_1, 0),
 235                         dma_read(CAPS_2, 0), dma_read(CAPS_3, 0),
 236                         dma_read(CAPS_4, 0));
 237
 238                 /* Disable OMAP 3.0/3.1 compatibility mode. */
 239                 w = dma_read(GSCR, 0);
 240                 w |= 1 << 3;
 241                 dma_write(w, GSCR, 0);
 242         }
 243         return;
 244 }
 245
 246 static unsigned configure_dma_errata(void)
 247 {
 248         unsigned errata = 0;
 249
 250         /*
 251          * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
 252          * read before the DMA controller finished disabling the channel.
 253          */
 254         if (!cpu_is_omap15xx())
 255                 SET_DMA_ERRATA(DMA_ERRATA_3_3);
 256
 257         return errata;
 258 }
 259
 260 static const struct platform_device_info omap_dma_dev_info = {
 261         .name = "omap-dma-engine",
 262         .id = -1,
 263         .dma_mask = DMA_BIT_MASK(32),
 264         .res = res,
 265         .num_res = 1,
 266 };
 267
 268 static struct omap_system_dma_plat_info dma_plat_info __initdata = {
 269         .reg_map        = reg_map,
 270         .channel_stride = 0x40,
 271         .show_dma_caps  = omap1_show_dma_caps,
 272         .clear_lch_regs = omap1_clear_lch_regs,
 273         .clear_dma      = omap1_clear_dma,
 274         .dma_write      = dma_write,
 275         .dma_read       = dma_read,
 276 };
 277
 278 static int __init omap1_system_dma_init(void)
 279 {
 280         struct omap_system_dma_plat_info        p;
 281         struct omap_dma_dev_attr                *d;
 282         struct platform_device                  *pdev, *dma_pdev;
 283         int ret;
 284
 285         pdev = platform_device_alloc("omap_dma_system", 0);
 286         if (!pdev) {
 287                 pr_err("%s: Unable to device alloc for dma\n",
 288                         __func__);
 289                 return -ENOMEM;
 290         }
 291
 292         dma_base = ioremap(res[0].start, resource_size(&res[0]));
 293         if (!dma_base) {
 294                 pr_err("%s: Unable to ioremap\n", __func__);
 295                 ret = -ENODEV;
 296                 goto exit_device_put;
 297         }
 298
 299         ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
 300         if (ret) {
 301                 dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
 302                         __func__, pdev->name, pdev->id);
 303                 goto exit_iounmap;
 304         }
 305
 306         d = kzalloc(sizeof(struct omap_dma_dev_attr), GFP_KERNEL);
 307         if (!d) {
 308                 dev_err(&pdev->dev, "%s: Unable to allocate 'd' for %s\n",
 309                         __func__, pdev->name);
 310                 ret = -ENOMEM;
 311                 goto exit_iounmap;
 312         }
 313
 314         d->lch_count            = OMAP1_LOGICAL_DMA_CH_COUNT;
 315
 316         /* Valid attributes for omap1 plus processors */
 317         if (cpu_is_omap15xx())
 318                 d->dev_caps = ENABLE_1510_MODE;
 319         enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
 320
 321         if (cpu_is_omap16xx())
 322                 d->dev_caps = ENABLE_16XX_MODE;
 323
 324         d->dev_caps             |= SRC_PORT;
 325         d->dev_caps             |= DST_PORT;
 326         d->dev_caps             |= SRC_INDEX;
 327         d->dev_caps             |= DST_INDEX;
 328         d->dev_caps             |= IS_BURST_ONLY4;
 329         d->dev_caps             |= CLEAR_CSR_ON_READ;
 330         d->dev_caps             |= IS_WORD_16;
 331
 332         if (cpu_is_omap15xx())
 333                 d->chan_count = 9;
 334         else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
 335                 if (!(d->dev_caps & ENABLE_1510_MODE))
 336                         d->chan_count = 16;
 337                 else
 338                         d->chan_count = 9;
 339         }
 340
 341         p = dma_plat_info;
 342         p.dma_attr = d;
 343         p.errata = configure_dma_errata();
 344
 345         ret = platform_device_add_data(pdev, &p, sizeof(p));
 346         if (ret) {
 347                 dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
 348                         __func__, pdev->name, pdev->id);
 349                 goto exit_release_d;
 350         }
 351
 352         ret = platform_device_add(pdev);
 353         if (ret) {
 354                 dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
 355                         __func__, pdev->name, pdev->id);
 356                 goto exit_release_d;
 357         }
 358
 359         dma_pdev = platform_device_register_full(&omap_dma_dev_info);
 360         if (IS_ERR(dma_pdev)) {
 361                 ret = PTR_ERR(dma_pdev);
 362                 goto exit_release_pdev;
 363         }
 364
 365         return ret;
 366
 367 exit_release_pdev:
 368         platform_device_del(pdev);
 369 exit_release_d:
 370         kfree(d);
 371 exit_iounmap:
 372         iounmap(dma_base);
 373 exit_device_put:
 374         platform_device_put(pdev);
 375
 376         return ret;
 377 }
 378 arch_initcall(omap1_system_dma_init);