drivers/mailbox/mailbox-omap2.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/slab.h>
  15 #include <linux/clk.h>
  16 #include <linux/err.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/io.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/platform_data/mailbox-omap.h>
  21
  22 #include "omap-mbox.h"
  23
  24 #define MAILBOX_REVISION                0x000
  25 #define MAILBOX_MESSAGE(m)              (0x040 + 4 * (m))
  26 #define MAILBOX_FIFOSTATUS(m)           (0x080 + 4 * (m))
  27 #define MAILBOX_MSGSTATUS(m)            (0x0c0 + 4 * (m))
  28 #define MAILBOX_IRQSTATUS(u)            (0x100 + 8 * (u))
  29 #define MAILBOX_IRQENABLE(u)            (0x104 + 8 * (u))
  30
  31 #define OMAP4_MAILBOX_IRQSTATUS(u)      (0x104 + 0x10 * (u))
  32 #define OMAP4_MAILBOX_IRQENABLE(u)      (0x108 + 0x10 * (u))
  33 #define OMAP4_MAILBOX_IRQENABLE_CLR(u)  (0x10c + 0x10 * (u))
  34
  35 #define MAILBOX_IRQ_NEWMSG(m)           (1 << (2 * (m)))
  36 #define MAILBOX_IRQ_NOTFULL(m)          (1 << (2 * (m) + 1))
  37
  38 #define MBOX_REG_SIZE                   0x120
  39
  40 #define OMAP4_MBOX_REG_SIZE             0x130
  41
  42 #define MBOX_NR_REGS                    (MBOX_REG_SIZE / sizeof(u32))
  43 #define OMAP4_MBOX_NR_REGS              (OMAP4_MBOX_REG_SIZE / sizeof(u32))
  44
  45 static void __iomem *mbox_base;
  46
  47 struct omap_mbox2_fifo {
  48         unsigned long msg;
  49         unsigned long fifo_stat;
  50         unsigned long msg_stat;
  51 };
  52
  53 struct omap_mbox2_priv {
  54         struct omap_mbox2_fifo tx_fifo;
  55         struct omap_mbox2_fifo rx_fifo;
  56         unsigned long irqenable;
  57         unsigned long irqstatus;
  58         u32 newmsg_bit;
  59         u32 notfull_bit;
  60         u32 ctx[OMAP4_MBOX_NR_REGS];
  61         unsigned long irqdisable;
  62         u32 intr_type;
  63 };
  64
  65 static inline unsigned int mbox_read_reg(size_t ofs)
  66 {
  67         return __raw_readl(mbox_base + ofs);
  68 }
  69
  70 static inline void mbox_write_reg(u32 val, size_t ofs)
  71 {
  72         __raw_writel(val, mbox_base + ofs);
  73 }
  74
  75 /* Mailbox H/W preparations */
  76 static int omap2_mbox_startup(struct omap_mbox *mbox)
  77 {
  78         u32 l;
  79
  80         pm_runtime_enable(mbox->dev->parent);
  81         pm_runtime_get_sync(mbox->dev->parent);
  82
  83         l = mbox_read_reg(MAILBOX_REVISION);
  84         pr_debug("omap mailbox rev %d.%d\n", (l & 0xf0) >> 4, (l & 0x0f));
  85
  86         return 0;
  87 }
  88
  89 static void omap2_mbox_shutdown(struct omap_mbox *mbox)
  90 {
  91         pm_runtime_put_sync(mbox->dev->parent);
  92         pm_runtime_disable(mbox->dev->parent);
  93 }
  94
  95 /* Mailbox FIFO handle functions */
  96 static mbox_msg_t omap2_mbox_fifo_read(struct omap_mbox *mbox)
  97 {
  98         struct omap_mbox2_fifo *fifo =
  99                 &((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
 100         return (mbox_msg_t) mbox_read_reg(fifo->msg);
 101 }
 102
 103 static void omap2_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
 104 {
 105         struct omap_mbox2_fifo *fifo =
 106                 &((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
 107         mbox_write_reg(msg, fifo->msg);
 108 }
 109
 110 static int omap2_mbox_fifo_empty(struct omap_mbox *mbox)
 111 {
 112         struct omap_mbox2_fifo *fifo =
 113                 &((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
 114         return (mbox_read_reg(fifo->msg_stat) == 0);
 115 }
 116
 117 static int omap2_mbox_fifo_full(struct omap_mbox *mbox)
 118 {
 119         struct omap_mbox2_fifo *fifo =
 120                 &((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
 121         return mbox_read_reg(fifo->fifo_stat);
 122 }
 123
 124 /* Mailbox IRQ handle functions */
 125 static void omap2_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 126 {
 127         struct omap_mbox2_priv *p = mbox->priv;
 128         u32 l, bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
 129
 130         l = mbox_read_reg(p->irqenable);
 131         l |= bit;
 132         mbox_write_reg(l, p->irqenable);
 133 }
 134
 135 static void omap2_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 136 {
 137         struct omap_mbox2_priv *p = mbox->priv;
 138         u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
 139
 140         /*
 141          * Read and update the interrupt configuration register for pre-OMAP4.
 142          * OMAP4 and later SoCs have a dedicated interrupt disabling register.
 143          */
 144         if (!p->intr_type)
 145                 bit = mbox_read_reg(p->irqdisable) & ~bit;
 146
 147         mbox_write_reg(bit, p->irqdisable);
 148 }
 149
 150 static void omap2_mbox_ack_irq(struct omap_mbox *mbox, omap_mbox_irq_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, omap_mbox_irq_t irq)
 162 {
 163         struct omap_mbox2_priv *p = mbox->priv;
 164         u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
 165         u32 enable = mbox_read_reg(p->irqenable);
 166         u32 status = mbox_read_reg(p->irqstatus);
 167
 168         return (int)(enable & status & bit);
 169 }
 170
 171 static void omap2_mbox_save_ctx(struct omap_mbox *mbox)
 172 {
 173         int i;
 174         struct omap_mbox2_priv *p = mbox->priv;
 175         int nr_regs;
 176
 177         if (p->intr_type)
 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
 195         if (p->intr_type)
 196                 nr_regs = OMAP4_MBOX_NR_REGS;
 197         else
 198                 nr_regs = MBOX_NR_REGS;
 199         for (i = 0; i < nr_regs; i++) {
 200                 mbox_write_reg(p->ctx[i], i * sizeof(u32));
 201
 202                 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
 203                         i, p->ctx[i]);
 204         }
 205 }
 206
 207 static struct omap_mbox_ops omap2_mbox_ops = {
 208         .type           = OMAP_MBOX_TYPE2,
 209         .startup        = omap2_mbox_startup,
 210         .shutdown       = omap2_mbox_shutdown,
 211         .fifo_read      = omap2_mbox_fifo_read,
 212         .fifo_write     = omap2_mbox_fifo_write,
 213         .fifo_empty     = omap2_mbox_fifo_empty,
 214         .fifo_full      = omap2_mbox_fifo_full,
 215         .enable_irq     = omap2_mbox_enable_irq,
 216         .disable_irq    = omap2_mbox_disable_irq,
 217         .ack_irq        = omap2_mbox_ack_irq,
 218         .is_irq         = omap2_mbox_is_irq,
 219         .save_ctx       = omap2_mbox_save_ctx,
 220         .restore_ctx    = omap2_mbox_restore_ctx,
 221 };
 222
 223 static int omap2_mbox_probe(struct platform_device *pdev)
 224 {
 225         struct resource *mem;
 226         int ret;
 227         struct omap_mbox **list, *mbox, *mboxblk;
 228         struct omap_mbox2_priv *priv, *privblk;
 229         struct omap_mbox_pdata *pdata = pdev->dev.platform_data;
 230         struct omap_mbox_dev_info *info;
 231         int i;
 232
 233         if (!pdata || !pdata->info_cnt || !pdata->info) {
 234                 pr_err("%s: platform not supported\n", __func__);
 235                 return -ENODEV;
 236         }
 237
 238         /* allocate one extra for marking end of list */
 239         list = kzalloc((pdata->info_cnt + 1) * sizeof(*list), GFP_KERNEL);
 240         if (!list)
 241                 return -ENOMEM;
 242
 243         mboxblk = mbox = kzalloc(pdata->info_cnt * sizeof(*mbox), GFP_KERNEL);
 244         if (!mboxblk) {
 245                 ret = -ENOMEM;
 246                 goto free_list;
 247         }
 248
 249         privblk = priv = kzalloc(pdata->info_cnt * sizeof(*priv), GFP_KERNEL);
 250         if (!privblk) {
 251                 ret = -ENOMEM;
 252                 goto free_mboxblk;
 253         }
 254
 255         info = pdata->info;
 256         for (i = 0; i < pdata->info_cnt; i++, info++, priv++) {
 257                 priv->tx_fifo.msg = MAILBOX_MESSAGE(info->tx_id);
 258                 priv->tx_fifo.fifo_stat = MAILBOX_FIFOSTATUS(info->tx_id);
 259                 priv->rx_fifo.msg =  MAILBOX_MESSAGE(info->rx_id);
 260                 priv->rx_fifo.msg_stat =  MAILBOX_MSGSTATUS(info->rx_id);
 261                 priv->notfull_bit = MAILBOX_IRQ_NOTFULL(info->tx_id);
 262                 priv->newmsg_bit = MAILBOX_IRQ_NEWMSG(info->rx_id);
 263                 if (pdata->intr_type) {
 264                         priv->irqenable = OMAP4_MAILBOX_IRQENABLE(info->usr_id);
 265                         priv->irqstatus = OMAP4_MAILBOX_IRQSTATUS(info->usr_id);
 266                         priv->irqdisable =
 267                                 OMAP4_MAILBOX_IRQENABLE_CLR(info->usr_id);
 268                 } else {
 269                         priv->irqenable = MAILBOX_IRQENABLE(info->usr_id);
 270                         priv->irqstatus = MAILBOX_IRQSTATUS(info->usr_id);
 271                         priv->irqdisable = MAILBOX_IRQENABLE(info->usr_id);
 272                 }
 273                 priv->intr_type = pdata->intr_type;
 274
 275                 mbox->priv = priv;
 276                 mbox->name = info->name;
 277                 mbox->ops = &omap2_mbox_ops;
 278                 mbox->irq = platform_get_irq(pdev, info->irq_id);
 279                 if (mbox->irq < 0) {
 280                         ret = mbox->irq;
 281                         goto free_privblk;
 282                 }
 283                 list[i] = mbox++;
 284         }
 285
 286         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 287         if (!mem) {
 288                 ret = -ENOENT;
 289                 goto free_privblk;
 290         }
 291
 292         mbox_base = ioremap(mem->start, resource_size(mem));
 293         if (!mbox_base) {
 294                 ret = -ENOMEM;
 295                 goto free_privblk;
 296         }
 297
 298         ret = omap_mbox_register(&pdev->dev, list);
 299         if (ret)
 300                 goto unmap_mbox;
 301         platform_set_drvdata(pdev, list);
 302
 303         return 0;
 304
 305 unmap_mbox:
 306         iounmap(mbox_base);
 307 free_privblk:
 308         kfree(privblk);
 309 free_mboxblk:
 310         kfree(mboxblk);
 311 free_list:
 312         kfree(list);
 313         return ret;
 314 }
 315
 316 static int omap2_mbox_remove(struct platform_device *pdev)
 317 {
 318         struct omap_mbox2_priv *privblk;
 319         struct omap_mbox **list = platform_get_drvdata(pdev);
 320         struct omap_mbox *mboxblk = list[0];
 321
 322         privblk = mboxblk->priv;
 323         omap_mbox_unregister();
 324         iounmap(mbox_base);
 325         kfree(privblk);
 326         kfree(mboxblk);
 327         kfree(list);
 328
 329         return 0;
 330 }
 331
 332 static struct platform_driver omap2_mbox_driver = {
 333         .probe  = omap2_mbox_probe,
 334         .remove = omap2_mbox_remove,
 335         .driver = {
 336                 .name = "omap-mailbox",
 337         },
 338 };
 339
 340 static int __init omap2_mbox_init(void)
 341 {
 342         return platform_driver_register(&omap2_mbox_driver);
 343 }
 344
 345 static void __exit omap2_mbox_exit(void)
 346 {
 347         platform_driver_unregister(&omap2_mbox_driver);
 348 }
 349
 350 module_init(omap2_mbox_init);
 351 module_exit(omap2_mbox_exit);
 352
 353 MODULE_LICENSE("GPL v2");
 354 MODULE_DESCRIPTION("omap mailbox: omap2/3/4 architecture specific functions");
 355 MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
 356 MODULE_AUTHOR("Paul Mundt");
 357 MODULE_ALIAS("platform:omap2-mailbox");