arch/arm/mach-omap2/mailbox.c

   1 /*
   2  * Mailbox reservation modules for OMAP2/3
   3  *
   4  * Copyright (C) 2006-2009 Nokia Corporation
   5  * Written by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
   6  *        and  Paul Mundt
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file "COPYING" in the main directory of this archive
  10  * for more details.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/clk.h>
  15 #include <linux/err.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/io.h>
  18 #include <linux/pm_runtime.h>
  19
  20 #include <plat/cpu.h>
  21 #include <plat/mailbox.h>
  22
  23 #define MAILBOX_REVISION                0x000
  24 #define MAILBOX_MESSAGE(m)              (0x040 + 4 * (m))
  25 #define MAILBOX_FIFOSTATUS(m)           (0x080 + 4 * (m))
  26 #define MAILBOX_MSGSTATUS(m)            (0x0c0 + 4 * (m))
  27 #define MAILBOX_IRQSTATUS(u)            (0x100 + 8 * (u))
  28 #define MAILBOX_IRQENABLE(u)            (0x104 + 8 * (u))
  29
  30 #define OMAP4_MAILBOX_IRQSTATUS(u)      (0x104 + 0x10 * (u))
  31 #define OMAP4_MAILBOX_IRQENABLE(u)      (0x108 + 0x10 * (u))
  32 #define OMAP4_MAILBOX_IRQENABLE_CLR(u)  (0x10c + 0x10 * (u))
  33
  34 #define MAILBOX_IRQ_NEWMSG(m)           (1 << (2 * (m)))
  35 #define MAILBOX_IRQ_NOTFULL(m)          (1 << (2 * (m) + 1))
  36
  37 #define MBOX_REG_SIZE                   0x120
  38
  39 #define OMAP4_MBOX_REG_SIZE             0x130
  40
  41 #define MBOX_NR_REGS                    (MBOX_REG_SIZE / sizeof(u32))
  42 #define OMAP4_MBOX_NR_REGS              (OMAP4_MBOX_REG_SIZE / sizeof(u32))
  43
  44 static void __iomem *mbox_base;
  45
  46 struct omap_mbox2_fifo {
  47         unsigned long msg;
  48         unsigned long fifo_stat;
  49         unsigned long msg_stat;
  50 };
  51
  52 struct omap_mbox2_priv {
  53         struct omap_mbox2_fifo tx_fifo;
  54         struct omap_mbox2_fifo rx_fifo;
  55         unsigned long irqenable;
  56         unsigned long irqstatus;
  57         u32 newmsg_bit;
  58         u32 notfull_bit;
  59         u32 ctx[OMAP4_MBOX_NR_REGS];
  60         unsigned long irqdisable;
  61 };
  62
  63 static void omap2_mbox_enable_irq(struct omap_mbox *mbox,
  64                                   omap_mbox_type_t irq);
  65
  66 static inline unsigned int mbox_read_reg(size_t ofs)
  67 {
  68         return __raw_readl(mbox_base + ofs);
  69 }
  70
  71 static inline void mbox_write_reg(u32 val, size_t ofs)
  72 {
  73         __raw_writel(val, mbox_base + ofs);
  74 }
  75
  76 /* Mailbox H/W preparations */
  77 static int omap2_mbox_startup(struct omap_mbox *mbox)
  78 {
  79         u32 l;
  80
  81         pm_runtime_enable(mbox->dev->parent);
  82         pm_runtime_get_sync(mbox->dev->parent);
  83
  84         l = mbox_read_reg(MAILBOX_REVISION);
  85         pr_debug("omap mailbox rev %d.%d\n", (l & 0xf0) >> 4, (l & 0x0f));
  86
  87         return 0;
  88 }
  89
  90 static void omap2_mbox_shutdown(struct omap_mbox *mbox)
  91 {
  92         pm_runtime_put_sync(mbox->dev->parent);
  93         pm_runtime_disable(mbox->dev->parent);
  94 }
  95
  96 /* Mailbox FIFO handle functions */
  97 static mbox_msg_t omap2_mbox_fifo_read(struct omap_mbox *mbox)
  98 {
  99         struct omap_mbox2_fifo *fifo =
 100                 &((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
 101         return (mbox_msg_t) mbox_read_reg(fifo->msg);
 102 }
 103
 104 static void omap2_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
 105 {
 106         struct omap_mbox2_fifo *fifo =
 107                 &((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
 108         mbox_write_reg(msg, fifo->msg);
 109 }
 110
 111 static int omap2_mbox_fifo_empty(struct omap_mbox *mbox)
 112 {
 113         struct omap_mbox2_fifo *fifo =
 114                 &((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
 115         return (mbox_read_reg(fifo->msg_stat) == 0);
 116 }
 117
 118 static int omap2_mbox_fifo_full(struct omap_mbox *mbox)
 119 {
 120         struct omap_mbox2_fifo *fifo =
 121                 &((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
 122         return mbox_read_reg(fifo->fifo_stat);
 123 }
 124
 125 /* Mailbox IRQ handle functions */
 126 static void omap2_mbox_enable_irq(struct omap_mbox *mbox,
 127                 omap_mbox_type_t irq)
 128 {
 129         struct omap_mbox2_priv *p = mbox->priv;
 130         u32 l, bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
 131
 132         l = mbox_read_reg(p->irqenable);
 133         l |= bit;
 134         mbox_write_reg(l, p->irqenable);
 135 }
 136
 137 static void omap2_mbox_disable_irq(struct omap_mbox *mbox,
 138                 omap_mbox_type_t irq)
 139 {
 140         struct omap_mbox2_priv *p = mbox->priv;
 141         u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
 142
 143         if (!cpu_is_omap44xx())
 144                 bit = mbox_read_reg(p->irqdisable) & ~bit;
 145
 146         mbox_write_reg(bit, p->irqdisable);
 147 }
 148
 149 static void omap2_mbox_ack_irq(struct omap_mbox *mbox,
 150                 omap_mbox_type_t irq)
 151 {
 152         struct omap_mbox2_priv *p = mbox->priv;
 153         u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
 154
 155         mbox_write_reg(bit, p->irqstatus);
 156
 157         /* Flush posted write for irq status to avoid spurious interrupts */
 158         mbox_read_reg(p->irqstatus);
 159 }
 160
 161 static int omap2_mbox_is_irq(struct omap_mbox *mbox,
 162                 omap_mbox_type_t irq)
 163 {
 164         struct omap_mbox2_priv *p = mbox->priv;
 165         u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
 166         u32 enable = mbox_read_reg(p->irqenable);
 167         u32 status = mbox_read_reg(p->irqstatus);
 168
 169         return (int)(enable & status & bit);
 170 }
 171
 172 static void omap2_mbox_save_ctx(struct omap_mbox *mbox)
 173 {
 174         int i;
 175         struct omap_mbox2_priv *p = mbox->priv;
 176         int nr_regs;
 177         if (cpu_is_omap44xx())
 178                 nr_regs = OMAP4_MBOX_NR_REGS;
 179         else
 180                 nr_regs = MBOX_NR_REGS;
 181         for (i = 0; i < nr_regs; i++) {
 182                 p->ctx[i] = mbox_read_reg(i * sizeof(u32));
 183
 184                 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
 185                         i, p->ctx[i]);
 186         }
 187 }
 188
 189 static void omap2_mbox_restore_ctx(struct omap_mbox *mbox)
 190 {
 191         int i;
 192         struct omap_mbox2_priv *p = mbox->priv;
 193         int nr_regs;
 194         if (cpu_is_omap44xx())
 195                 nr_regs = OMAP4_MBOX_NR_REGS;
 196         else
 197                 nr_regs = MBOX_NR_REGS;
 198         for (i = 0; i < nr_regs; i++) {
 199                 mbox_write_reg(p->ctx[i], i * sizeof(u32));
 200
 201                 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
 202                         i, p->ctx[i]);
 203         }
 204 }
 205
 206 static struct omap_mbox_ops omap2_mbox_ops = {
 207         .type           = OMAP_MBOX_TYPE2,
 208         .startup        = omap2_mbox_startup,
 209         .shutdown       = omap2_mbox_shutdown,
 210         .fifo_read      = omap2_mbox_fifo_read,
 211         .fifo_write     = omap2_mbox_fifo_write,
 212         .fifo_empty     = omap2_mbox_fifo_empty,
 213         .fifo_full      = omap2_mbox_fifo_full,
 214         .enable_irq     = omap2_mbox_enable_irq,
 215         .disable_irq    = omap2_mbox_disable_irq,
 216         .ack_irq        = omap2_mbox_ack_irq,
 217         .is_irq         = omap2_mbox_is_irq,
 218         .save_ctx       = omap2_mbox_save_ctx,
 219         .restore_ctx    = omap2_mbox_restore_ctx,
 220 };
 221
 222 /*
 223  * MAILBOX 0: ARM -> DSP,
 224  * MAILBOX 1: ARM <- DSP.
 225  * MAILBOX 2: ARM -> IVA,
 226  * MAILBOX 3: ARM <- IVA.
 227  */
 228
 229 /* FIXME: the following structs should be filled automatically by the user id */
 230
 231 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP2)
 232 /* DSP */
 233 static struct omap_mbox2_priv omap2_mbox_dsp_priv = {
 234         .tx_fifo = {
 235                 .msg            = MAILBOX_MESSAGE(0),
 236                 .fifo_stat      = MAILBOX_FIFOSTATUS(0),
 237         },
 238         .rx_fifo = {
 239                 .msg            = MAILBOX_MESSAGE(1),
 240                 .msg_stat       = MAILBOX_MSGSTATUS(1),
 241         },
 242         .irqenable      = MAILBOX_IRQENABLE(0),
 243         .irqstatus      = MAILBOX_IRQSTATUS(0),
 244         .notfull_bit    = MAILBOX_IRQ_NOTFULL(0),
 245         .newmsg_bit     = MAILBOX_IRQ_NEWMSG(1),
 246         .irqdisable     = MAILBOX_IRQENABLE(0),
 247 };
 248
 249 struct omap_mbox mbox_dsp_info = {
 250         .name   = "dsp",
 251         .ops    = &omap2_mbox_ops,
 252         .priv   = &omap2_mbox_dsp_priv,
 253 };
 254 #endif
 255
 256 #if defined(CONFIG_ARCH_OMAP3)
 257 struct omap_mbox *omap3_mboxes[] = { &mbox_dsp_info, NULL };
 258 #endif
 259
 260 #if defined(CONFIG_SOC_OMAP2420)
 261 /* IVA */
 262 static struct omap_mbox2_priv omap2_mbox_iva_priv = {
 263         .tx_fifo = {
 264                 .msg            = MAILBOX_MESSAGE(2),
 265                 .fifo_stat      = MAILBOX_FIFOSTATUS(2),
 266         },
 267         .rx_fifo = {
 268                 .msg            = MAILBOX_MESSAGE(3),
 269                 .msg_stat       = MAILBOX_MSGSTATUS(3),
 270         },
 271         .irqenable      = MAILBOX_IRQENABLE(3),
 272         .irqstatus      = MAILBOX_IRQSTATUS(3),
 273         .notfull_bit    = MAILBOX_IRQ_NOTFULL(2),
 274         .newmsg_bit     = MAILBOX_IRQ_NEWMSG(3),
 275         .irqdisable     = MAILBOX_IRQENABLE(3),
 276 };
 277
 278 static struct omap_mbox mbox_iva_info = {
 279         .name   = "iva",
 280         .ops    = &omap2_mbox_ops,
 281         .priv   = &omap2_mbox_iva_priv,
 282 };
 283 #endif
 284
 285 #ifdef CONFIG_ARCH_OMAP2
 286 struct omap_mbox *omap2_mboxes[] = {
 287         &mbox_dsp_info,
 288 #ifdef CONFIG_SOC_OMAP2420
 289         &mbox_iva_info,
 290 #endif
 291         NULL
 292 };
 293 #endif
 294
 295 #if defined(CONFIG_ARCH_OMAP4)
 296 /* OMAP4 */
 297 static struct omap_mbox2_priv omap2_mbox_1_priv = {
 298         .tx_fifo = {
 299                 .msg            = MAILBOX_MESSAGE(0),
 300                 .fifo_stat      = MAILBOX_FIFOSTATUS(0),
 301         },
 302         .rx_fifo = {
 303                 .msg            = MAILBOX_MESSAGE(1),
 304                 .msg_stat       = MAILBOX_MSGSTATUS(1),
 305         },
 306         .irqenable      = OMAP4_MAILBOX_IRQENABLE(0),
 307         .irqstatus      = OMAP4_MAILBOX_IRQSTATUS(0),
 308         .notfull_bit    = MAILBOX_IRQ_NOTFULL(0),
 309         .newmsg_bit     = MAILBOX_IRQ_NEWMSG(1),
 310         .irqdisable     = OMAP4_MAILBOX_IRQENABLE_CLR(0),
 311 };
 312
 313 struct omap_mbox mbox_1_info = {
 314         .name   = "mailbox-1",
 315         .ops    = &omap2_mbox_ops,
 316         .priv   = &omap2_mbox_1_priv,
 317 };
 318
 319 static struct omap_mbox2_priv omap2_mbox_2_priv = {
 320         .tx_fifo = {
 321                 .msg            = MAILBOX_MESSAGE(3),
 322                 .fifo_stat      = MAILBOX_FIFOSTATUS(3),
 323         },
 324         .rx_fifo = {
 325                 .msg            = MAILBOX_MESSAGE(2),
 326                 .msg_stat       = MAILBOX_MSGSTATUS(2),
 327         },
 328         .irqenable      = OMAP4_MAILBOX_IRQENABLE(0),
 329         .irqstatus      = OMAP4_MAILBOX_IRQSTATUS(0),
 330         .notfull_bit    = MAILBOX_IRQ_NOTFULL(3),
 331         .newmsg_bit     = MAILBOX_IRQ_NEWMSG(2),
 332         .irqdisable     = OMAP4_MAILBOX_IRQENABLE_CLR(0),
 333 };
 334
 335 struct omap_mbox mbox_2_info = {
 336         .name   = "mailbox-2",
 337         .ops    = &omap2_mbox_ops,
 338         .priv   = &omap2_mbox_2_priv,
 339 };
 340
 341 struct omap_mbox *omap4_mboxes[] = { &mbox_1_info, &mbox_2_info, NULL };
 342 #endif
 343
 344 static int __devinit omap2_mbox_probe(struct platform_device *pdev)
 345 {
 346         struct resource *mem;
 347         int ret;
 348         struct omap_mbox **list;
 349
 350         if (false)
 351                 ;
 352 #if defined(CONFIG_ARCH_OMAP3)
 353         else if (cpu_is_omap34xx()) {
 354                 list = omap3_mboxes;
 355
 356                 list[0]->irq = platform_get_irq(pdev, 0);
 357         }
 358 #endif
 359 #if defined(CONFIG_ARCH_OMAP2)
 360         else if (cpu_is_omap2430()) {
 361                 list = omap2_mboxes;
 362
 363                 list[0]->irq = platform_get_irq(pdev, 0);
 364         } else if (cpu_is_omap2420()) {
 365                 list = omap2_mboxes;
 366
 367                 list[0]->irq = platform_get_irq_byname(pdev, "dsp");
 368                 list[1]->irq = platform_get_irq_byname(pdev, "iva");
 369         }
 370 #endif
 371 #if defined(CONFIG_ARCH_OMAP4)
 372         else if (cpu_is_omap44xx()) {
 373                 list = omap4_mboxes;
 374
 375                 list[0]->irq = list[1]->irq = platform_get_irq(pdev, 0);
 376         }
 377 #endif
 378         else {
 379                 pr_err("%s: platform not supported\n", __func__);
 380                 return -ENODEV;
 381         }
 382
 383         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 384         mbox_base = ioremap(mem->start, resource_size(mem));
 385         if (!mbox_base)
 386                 return -ENOMEM;
 387
 388         ret = omap_mbox_register(&pdev->dev, list);
 389         if (ret) {
 390                 iounmap(mbox_base);
 391                 return ret;
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int __devexit omap2_mbox_remove(struct platform_device *pdev)
 398 {
 399         omap_mbox_unregister();
 400         iounmap(mbox_base);
 401         return 0;
 402 }
 403
 404 static struct platform_driver omap2_mbox_driver = {
 405         .probe = omap2_mbox_probe,
 406         .remove = __devexit_p(omap2_mbox_remove),
 407         .driver = {
 408                 .name = "omap-mailbox",
 409         },
 410 };
 411
 412 static int __init omap2_mbox_init(void)
 413 {
 414         return platform_driver_register(&omap2_mbox_driver);
 415 }
 416
 417 static void __exit omap2_mbox_exit(void)
 418 {
 419         platform_driver_unregister(&omap2_mbox_driver);
 420 }
 421
 422 module_init(omap2_mbox_init);
 423 module_exit(omap2_mbox_exit);
 424
 425 MODULE_LICENSE("GPL v2");
 426 MODULE_DESCRIPTION("omap mailbox: omap2/3/4 architecture specific functions");
 427 MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
 428 MODULE_AUTHOR("Paul Mundt");
 429 MODULE_ALIAS("platform:omap2-mailbox");