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/kernel.h>
  14 #include <linux/clk.h>
  15 #include <linux/err.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/io.h>
  18 #include <mach/mailbox.h>
  19 #include <mach/irqs.h>
  20
  21 #define MAILBOX_REVISION                0x000
  22 #define MAILBOX_SYSCONFIG               0x010
  23 #define MAILBOX_SYSSTATUS               0x014
  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 MAILBOX_IRQ_NEWMSG(u)           (1 << (2 * (u)))
  31 #define MAILBOX_IRQ_NOTFULL(u)          (1 << (2 * (u) + 1))
  32
  33 #define MBOX_REG_SIZE                   0x120
  34 #define MBOX_NR_REGS                    (MBOX_REG_SIZE / sizeof(u32))
  35
  36 static void __iomem *mbox_base;
  37
  38 struct omap_mbox2_fifo {
  39         unsigned long msg;
  40         unsigned long fifo_stat;
  41         unsigned long msg_stat;
  42 };
  43
  44 struct omap_mbox2_priv {
  45         struct omap_mbox2_fifo tx_fifo;
  46         struct omap_mbox2_fifo rx_fifo;
  47         unsigned long irqenable;
  48         unsigned long irqstatus;
  49         u32 newmsg_bit;
  50         u32 notfull_bit;
  51         u32 ctx[MBOX_NR_REGS];
  52 };
  53
  54 static struct clk *mbox_ick_handle;
  55
  56 static void omap2_mbox_enable_irq(struct omap_mbox *mbox,
  57                                   omap_mbox_type_t irq);
  58
  59 static inline unsigned int mbox_read_reg(size_t ofs)
  60 {
  61         return __raw_readl(mbox_base + ofs);
  62 }
  63
  64 static inline void mbox_write_reg(u32 val, size_t ofs)
  65 {
  66         __raw_writel(val, mbox_base + ofs);
  67 }
  68
  69 /* Mailbox H/W preparations */
  70 static int omap2_mbox_startup(struct omap_mbox *mbox)
  71 {
  72         unsigned int l;
  73
  74         mbox_ick_handle = clk_get(NULL, "mailboxes_ick");
  75         if (IS_ERR(mbox_ick_handle)) {
  76                 printk("Could not get mailboxes_ick\n");
  77                 return -ENODEV;
  78         }
  79         clk_enable(mbox_ick_handle);
  80
  81         l = mbox_read_reg(MAILBOX_REVISION);
  82         pr_info("omap mailbox rev %d.%d\n", (l & 0xf0) >> 4, (l & 0x0f));
  83
  84         /* set smart-idle & autoidle */
  85         l = mbox_read_reg(MAILBOX_SYSCONFIG);
  86         l |= 0x00000011;
  87         mbox_write_reg(l, MAILBOX_SYSCONFIG);
  88
  89         omap2_mbox_enable_irq(mbox, IRQ_RX);
  90
  91         return 0;
  92 }
  93
  94 static void omap2_mbox_shutdown(struct omap_mbox *mbox)
  95 {
  96         clk_disable(mbox_ick_handle);
  97         clk_put(mbox_ick_handle);
  98 }
  99
 100 /* Mailbox FIFO handle functions */
 101 static mbox_msg_t omap2_mbox_fifo_read(struct omap_mbox *mbox)
 102 {
 103         struct omap_mbox2_fifo *fifo =
 104                 &((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
 105         return (mbox_msg_t) mbox_read_reg(fifo->msg);
 106 }
 107
 108 static void omap2_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
 109 {
 110         struct omap_mbox2_fifo *fifo =
 111                 &((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
 112         mbox_write_reg(msg, fifo->msg);
 113 }
 114
 115 static int omap2_mbox_fifo_empty(struct omap_mbox *mbox)
 116 {
 117         struct omap_mbox2_fifo *fifo =
 118                 &((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
 119         return (mbox_read_reg(fifo->msg_stat) == 0);
 120 }
 121
 122 static int omap2_mbox_fifo_full(struct omap_mbox *mbox)
 123 {
 124         struct omap_mbox2_fifo *fifo =
 125                 &((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
 126         return (mbox_read_reg(fifo->fifo_stat));
 127 }
 128
 129 /* Mailbox IRQ handle functions */
 130 static void omap2_mbox_enable_irq(struct omap_mbox *mbox,
 131                 omap_mbox_type_t irq)
 132 {
 133         struct omap_mbox2_priv *p = (struct omap_mbox2_priv *)mbox->priv;
 134         u32 l, bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
 135
 136         l = mbox_read_reg(p->irqenable);
 137         l |= bit;
 138         mbox_write_reg(l, p->irqenable);
 139 }
 140
 141 static void omap2_mbox_disable_irq(struct omap_mbox *mbox,
 142                 omap_mbox_type_t irq)
 143 {
 144         struct omap_mbox2_priv *p = (struct omap_mbox2_priv *)mbox->priv;
 145         u32 l, bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
 146
 147         l = mbox_read_reg(p->irqenable);
 148         l &= ~bit;
 149         mbox_write_reg(l, p->irqenable);
 150 }
 151
 152 static void omap2_mbox_ack_irq(struct omap_mbox *mbox,
 153                 omap_mbox_type_t irq)
 154 {
 155         struct omap_mbox2_priv *p = (struct omap_mbox2_priv *)mbox->priv;
 156         u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
 157
 158         mbox_write_reg(bit, 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 = (struct omap_mbox2_priv *)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 (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
 177         for (i = 0; i < MBOX_NR_REGS; i++) {
 178                 p->ctx[i] = mbox_read_reg(i * sizeof(u32));
 179
 180                 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
 181                         i, p->ctx[i]);
 182         }
 183 }
 184
 185 static void omap2_mbox_restore_ctx(struct omap_mbox *mbox)
 186 {
 187         int i;
 188         struct omap_mbox2_priv *p = mbox->priv;
 189
 190         for (i = 0; i < MBOX_NR_REGS; i++) {
 191                 mbox_write_reg(p->ctx[i], i * sizeof(u32));
 192
 193                 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
 194                         i, p->ctx[i]);
 195         }
 196 }
 197
 198 static struct omap_mbox_ops omap2_mbox_ops = {
 199         .type           = OMAP_MBOX_TYPE2,
 200         .startup        = omap2_mbox_startup,
 201         .shutdown       = omap2_mbox_shutdown,
 202         .fifo_read      = omap2_mbox_fifo_read,
 203         .fifo_write     = omap2_mbox_fifo_write,
 204         .fifo_empty     = omap2_mbox_fifo_empty,
 205         .fifo_full      = omap2_mbox_fifo_full,
 206         .enable_irq     = omap2_mbox_enable_irq,
 207         .disable_irq    = omap2_mbox_disable_irq,
 208         .ack_irq        = omap2_mbox_ack_irq,
 209         .is_irq         = omap2_mbox_is_irq,
 210         .save_ctx       = omap2_mbox_save_ctx,
 211         .restore_ctx    = omap2_mbox_restore_ctx,
 212 };
 213
 214 /*
 215  * MAILBOX 0: ARM -> DSP,
 216  * MAILBOX 1: ARM <- DSP.
 217  * MAILBOX 2: ARM -> IVA,
 218  * MAILBOX 3: ARM <- IVA.
 219  */
 220
 221 /* FIXME: the following structs should be filled automatically by the user id */
 222
 223 /* DSP */
 224 static struct omap_mbox2_priv omap2_mbox_dsp_priv = {
 225         .tx_fifo = {
 226                 .msg            = MAILBOX_MESSAGE(0),
 227                 .fifo_stat      = MAILBOX_FIFOSTATUS(0),
 228         },
 229         .rx_fifo = {
 230                 .msg            = MAILBOX_MESSAGE(1),
 231                 .msg_stat       = MAILBOX_MSGSTATUS(1),
 232         },
 233         .irqenable      = MAILBOX_IRQENABLE(0),
 234         .irqstatus      = MAILBOX_IRQSTATUS(0),
 235         .notfull_bit    = MAILBOX_IRQ_NOTFULL(0),
 236         .newmsg_bit     = MAILBOX_IRQ_NEWMSG(1),
 237 };
 238
 239 struct omap_mbox mbox_dsp_info = {
 240         .name   = "dsp",
 241         .ops    = &omap2_mbox_ops,
 242         .priv   = &omap2_mbox_dsp_priv,
 243 };
 244 EXPORT_SYMBOL(mbox_dsp_info);
 245
 246 #if defined(CONFIG_ARCH_OMAP2420) /* IVA */
 247 static struct omap_mbox2_priv omap2_mbox_iva_priv = {
 248         .tx_fifo = {
 249                 .msg            = MAILBOX_MESSAGE(2),
 250                 .fifo_stat      = MAILBOX_FIFOSTATUS(2),
 251         },
 252         .rx_fifo = {
 253                 .msg            = MAILBOX_MESSAGE(3),
 254                 .msg_stat       = MAILBOX_MSGSTATUS(3),
 255         },
 256         .irqenable      = MAILBOX_IRQENABLE(3),
 257         .irqstatus      = MAILBOX_IRQSTATUS(3),
 258         .notfull_bit    = MAILBOX_IRQ_NOTFULL(2),
 259         .newmsg_bit     = MAILBOX_IRQ_NEWMSG(3),
 260 };
 261
 262 static struct omap_mbox mbox_iva_info = {
 263         .name   = "iva",
 264         .ops    = &omap2_mbox_ops,
 265         .priv   = &omap2_mbox_iva_priv,
 266 };
 267 #endif
 268
 269 static int __devinit omap2_mbox_probe(struct platform_device *pdev)
 270 {
 271         struct resource *res;
 272         int ret;
 273
 274         /* MBOX base */
 275         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 276         if (unlikely(!res)) {
 277                 dev_err(&pdev->dev, "invalid mem resource\n");
 278                 return -ENODEV;
 279         }
 280         mbox_base = ioremap(res->start, res->end - res->start);
 281         if (!mbox_base)
 282                 return -ENOMEM;
 283
 284         /* DSP or IVA2 IRQ */
 285         ret = platform_get_irq(pdev, 0);
 286         if (ret < 0) {
 287                 dev_err(&pdev->dev, "invalid irq resource\n");
 288                 goto err_dsp;
 289         }
 290         mbox_dsp_info.irq = ret;
 291
 292         ret = omap_mbox_register(&pdev->dev, &mbox_dsp_info);
 293         if (ret)
 294                 goto err_dsp;
 295
 296 #if defined(CONFIG_ARCH_OMAP2420) /* IVA */
 297         if (cpu_is_omap2420()) {
 298                 /* IVA IRQ */
 299                 res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
 300                 if (unlikely(!res)) {
 301                         dev_err(&pdev->dev, "invalid irq resource\n");
 302                         ret = -ENODEV;
 303                         goto err_iva1;
 304                 }
 305                 mbox_iva_info.irq = res->start;
 306                 ret = omap_mbox_register(&pdev->dev, &mbox_iva_info);
 307                 if (ret)
 308                         goto err_iva1;
 309         }
 310 #endif
 311         return 0;
 312
 313 err_iva1:
 314         omap_mbox_unregister(&mbox_dsp_info);
 315 err_dsp:
 316         iounmap(mbox_base);
 317         return ret;
 318 }
 319
 320 static int __devexit omap2_mbox_remove(struct platform_device *pdev)
 321 {
 322 #if defined(CONFIG_ARCH_OMAP2420)
 323         omap_mbox_unregister(&mbox_iva_info);
 324 #endif
 325         omap_mbox_unregister(&mbox_dsp_info);
 326         iounmap(mbox_base);
 327         return 0;
 328 }
 329
 330 static struct platform_driver omap2_mbox_driver = {
 331         .probe = omap2_mbox_probe,
 332         .remove = __devexit_p(omap2_mbox_remove),
 333         .driver = {
 334                 .name = "omap2-mailbox",
 335         },
 336 };
 337
 338 static int __init omap2_mbox_init(void)
 339 {
 340         return platform_driver_register(&omap2_mbox_driver);
 341 }
 342
 343 static void __exit omap2_mbox_exit(void)
 344 {
 345         platform_driver_unregister(&omap2_mbox_driver);
 346 }
 347
 348 module_init(omap2_mbox_init);
 349 module_exit(omap2_mbox_exit);
 350
 351 MODULE_LICENSE("GPL v2");
 352 MODULE_DESCRIPTION("omap mailbox: omap2/3 architecture specific functions");
 353 MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>, Paul Mundt");
 354 MODULE_ALIAS("platform:omap2-mailbox");