drivers/remoteproc/omap_remoteproc.c

   1 /*
   2  * OMAP Remote Processor driver
   3  *
   4  * Copyright (C) 2011 Texas Instruments, Inc.
   5  * Copyright (C) 2011 Google, Inc.
   6  *
   7  * Ohad Ben-Cohen <ohad@wizery.com>
   8  * Brian Swetland <swetland@google.com>
   9  * Fernando Guzman Lugo <fernando.lugo@ti.com>
  10  * Mark Grosen <mgrosen@ti.com>
  11  * Suman Anna <s-anna@ti.com>
  12  * Hari Kanigeri <h-kanigeri2@ti.com>
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * version 2 as published by the Free Software Foundation.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/err.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/dma-mapping.h>
  29 #include <linux/remoteproc.h>
  30 #include <linux/mailbox_client.h>
  31 #include <linux/omap-mailbox.h>
  32
  33 #include <linux/platform_data/remoteproc-omap.h>
  34
  35 #include "omap_remoteproc.h"
  36 #include "remoteproc_internal.h"
  37
  38 /**
  39  * struct omap_rproc - omap remote processor state
  40  * @mbox: mailbox channel handle
  41  * @client: mailbox client to request the mailbox channel
  42  * @rproc: rproc handle
  43  */
  44 struct omap_rproc {
  45         struct mbox_chan *mbox;
  46         struct mbox_client client;
  47         struct rproc *rproc;
  48 };
  49
  50 /**
  51  * omap_rproc_mbox_callback() - inbound mailbox message handler
  52  * @client: mailbox client pointer used for requesting the mailbox channel
  53  * @data: mailbox payload
  54  *
  55  * This handler is invoked by omap's mailbox driver whenever a mailbox
  56  * message is received. Usually, the mailbox payload simply contains
  57  * the index of the virtqueue that is kicked by the remote processor,
  58  * and we let remoteproc core handle it.
  59  *
  60  * In addition to virtqueue indices, we also have some out-of-band values
  61  * that indicates different events. Those values are deliberately very
  62  * big so they don't coincide with virtqueue indices.
  63  */
  64 static void omap_rproc_mbox_callback(struct mbox_client *client, void *data)
  65 {
  66         struct omap_rproc *oproc = container_of(client, struct omap_rproc,
  67                                                 client);
  68         struct device *dev = oproc->rproc->dev.parent;
  69         const char *name = oproc->rproc->name;
  70         u32 msg = (u32)data;
  71
  72         dev_dbg(dev, "mbox msg: 0x%x\n", msg);
  73
  74         switch (msg) {
  75         case RP_MBOX_CRASH:
  76                 /* just log this for now. later, we'll also do recovery */
  77                 dev_err(dev, "omap rproc %s crashed\n", name);
  78                 break;
  79         case RP_MBOX_ECHO_REPLY:
  80                 dev_info(dev, "received echo reply from %s\n", name);
  81                 break;
  82         default:
  83                 /* msg contains the index of the triggered vring */
  84                 if (rproc_vq_interrupt(oproc->rproc, msg) == IRQ_NONE)
  85                         dev_dbg(dev, "no message was found in vqid %d\n", msg);
  86         }
  87 }
  88
  89 /* kick a virtqueue */
  90 static void omap_rproc_kick(struct rproc *rproc, int vqid)
  91 {
  92         struct omap_rproc *oproc = rproc->priv;
  93         struct device *dev = rproc->dev.parent;
  94         int ret;
  95
  96         /* send the index of the triggered virtqueue in the mailbox payload */
  97         ret = mbox_send_message(oproc->mbox, (void *)vqid);
  98         if (ret < 0)
  99                 dev_err(dev, "failed to send mailbox message, status = %d\n",
 100                         ret);
 101 }
 102
 103 /*
 104  * Power up the remote processor.
 105  *
 106  * This function will be invoked only after the firmware for this rproc
 107  * was loaded, parsed successfully, and all of its resource requirements
 108  * were met.
 109  */
 110 static int omap_rproc_start(struct rproc *rproc)
 111 {
 112         struct omap_rproc *oproc = rproc->priv;
 113         struct device *dev = rproc->dev.parent;
 114         struct platform_device *pdev = to_platform_device(dev);
 115         struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
 116         int ret;
 117         struct mbox_client *client = &oproc->client;
 118
 119         if (pdata->set_bootaddr)
 120                 pdata->set_bootaddr(rproc->bootaddr);
 121
 122         client->dev = dev;
 123         client->tx_done = NULL;
 124         client->rx_callback = omap_rproc_mbox_callback;
 125         client->tx_block = false;
 126         client->knows_txdone = false;
 127
 128         oproc->mbox = omap_mbox_request_channel(client, pdata->mbox_name);
 129         if (IS_ERR(oproc->mbox)) {
 130                 ret = -EBUSY;
 131                 dev_err(dev, "mbox_request_channel failed: %ld\n",
 132                         PTR_ERR(oproc->mbox));
 133                 return ret;
 134         }
 135
 136         /*
 137          * Ping the remote processor. this is only for sanity-sake;
 138          * there is no functional effect whatsoever.
 139          *
 140          * Note that the reply will _not_ arrive immediately: this message
 141          * will wait in the mailbox fifo until the remote processor is booted.
 142          */
 143         ret = mbox_send_message(oproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
 144         if (ret < 0) {
 145                 dev_err(dev, "mbox_send_message failed: %d\n", ret);
 146                 goto put_mbox;
 147         }
 148
 149         ret = pdata->device_enable(pdev);
 150         if (ret) {
 151                 dev_err(dev, "omap_device_enable failed: %d\n", ret);
 152                 goto put_mbox;
 153         }
 154
 155         return 0;
 156
 157 put_mbox:
 158         mbox_free_channel(oproc->mbox);
 159         return ret;
 160 }
 161
 162 /* power off the remote processor */
 163 static int omap_rproc_stop(struct rproc *rproc)
 164 {
 165         struct device *dev = rproc->dev.parent;
 166         struct platform_device *pdev = to_platform_device(dev);
 167         struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
 168         struct omap_rproc *oproc = rproc->priv;
 169         int ret;
 170
 171         ret = pdata->device_shutdown(pdev);
 172         if (ret)
 173                 return ret;
 174
 175         mbox_free_channel(oproc->mbox);
 176
 177         return 0;
 178 }
 179
 180 static const struct rproc_ops omap_rproc_ops = {
 181         .start          = omap_rproc_start,
 182         .stop           = omap_rproc_stop,
 183         .kick           = omap_rproc_kick,
 184 };
 185
 186 static int omap_rproc_probe(struct platform_device *pdev)
 187 {
 188         struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
 189         struct omap_rproc *oproc;
 190         struct rproc *rproc;
 191         int ret;
 192
 193         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 194         if (ret) {
 195                 dev_err(&pdev->dev, "dma_set_coherent_mask: %d\n", ret);
 196                 return ret;
 197         }
 198
 199         rproc = rproc_alloc(&pdev->dev, pdata->name, &omap_rproc_ops,
 200                             pdata->firmware, sizeof(*oproc));
 201         if (!rproc)
 202                 return -ENOMEM;
 203
 204         oproc = rproc->priv;
 205         oproc->rproc = rproc;
 206         /* All existing OMAP IPU and DSP processors have an MMU */
 207         rproc->has_iommu = true;
 208
 209         platform_set_drvdata(pdev, rproc);
 210
 211         ret = rproc_add(rproc);
 212         if (ret)
 213                 goto free_rproc;
 214
 215         return 0;
 216
 217 free_rproc:
 218         rproc_free(rproc);
 219         return ret;
 220 }
 221
 222 static int omap_rproc_remove(struct platform_device *pdev)
 223 {
 224         struct rproc *rproc = platform_get_drvdata(pdev);
 225
 226         rproc_del(rproc);
 227         rproc_free(rproc);
 228
 229         return 0;
 230 }
 231
 232 static struct platform_driver omap_rproc_driver = {
 233         .probe = omap_rproc_probe,
 234         .remove = omap_rproc_remove,
 235         .driver = {
 236                 .name = "omap-rproc",
 237         },
 238 };
 239
 240 module_platform_driver(omap_rproc_driver);
 241
 242 MODULE_LICENSE("GPL v2");
 243 MODULE_DESCRIPTION("OMAP Remote Processor control driver");