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, "omap_mbox_msg_send failed: %d\n", ret);
 100 }
 101
 102 /*
 103  * Power up the remote processor.
 104  *
 105  * This function will be invoked only after the firmware for this rproc
 106  * was loaded, parsed successfully, and all of its resource requirements
 107  * were met.
 108  */
 109 static int omap_rproc_start(struct rproc *rproc)
 110 {
 111         struct omap_rproc *oproc = rproc->priv;
 112         struct device *dev = rproc->dev.parent;
 113         struct platform_device *pdev = to_platform_device(dev);
 114         struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
 115         int ret;
 116         struct mbox_client *client = &oproc->client;
 117
 118         if (pdata->set_bootaddr)
 119                 pdata->set_bootaddr(rproc->bootaddr);
 120
 121         client->dev = dev;
 122         client->tx_done = NULL;
 123         client->rx_callback = omap_rproc_mbox_callback;
 124         client->tx_block = false;
 125         client->knows_txdone = false;
 126
 127         oproc->mbox = omap_mbox_request_channel(client, pdata->mbox_name);
 128         if (IS_ERR(oproc->mbox)) {
 129                 ret = -EBUSY;
 130                 dev_err(dev, "mbox_request_channel failed: %ld\n",
 131                         PTR_ERR(oproc->mbox));
 132                 return ret;
 133         }
 134
 135         /*
 136          * Ping the remote processor. this is only for sanity-sake;
 137          * there is no functional effect whatsoever.
 138          *
 139          * Note that the reply will _not_ arrive immediately: this message
 140          * will wait in the mailbox fifo until the remote processor is booted.
 141          */
 142         ret = mbox_send_message(oproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
 143         if (ret < 0) {
 144                 dev_err(dev, "mbox_send_message failed: %d\n", ret);
 145                 goto put_mbox;
 146         }
 147
 148         ret = pdata->device_enable(pdev);
 149         if (ret) {
 150                 dev_err(dev, "omap_device_enable failed: %d\n", ret);
 151                 goto put_mbox;
 152         }
 153
 154         return 0;
 155
 156 put_mbox:
 157         mbox_free_channel(oproc->mbox);
 158         return ret;
 159 }
 160
 161 /* power off the remote processor */
 162 static int omap_rproc_stop(struct rproc *rproc)
 163 {
 164         struct device *dev = rproc->dev.parent;
 165         struct platform_device *pdev = to_platform_device(dev);
 166         struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
 167         struct omap_rproc *oproc = rproc->priv;
 168         int ret;
 169
 170         ret = pdata->device_shutdown(pdev);
 171         if (ret)
 172                 return ret;
 173
 174         mbox_free_channel(oproc->mbox);
 175
 176         return 0;
 177 }
 178
 179 static struct rproc_ops omap_rproc_ops = {
 180         .start          = omap_rproc_start,
 181         .stop           = omap_rproc_stop,
 182         .kick           = omap_rproc_kick,
 183 };
 184
 185 static int omap_rproc_probe(struct platform_device *pdev)
 186 {
 187         struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
 188         struct omap_rproc *oproc;
 189         struct rproc *rproc;
 190         int ret;
 191
 192         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 193         if (ret) {
 194                 dev_err(&pdev->dev, "dma_set_coherent_mask: %d\n", ret);
 195                 return ret;
 196         }
 197
 198         rproc = rproc_alloc(&pdev->dev, pdata->name, &omap_rproc_ops,
 199                                 pdata->firmware, sizeof(*oproc));
 200         if (!rproc)
 201                 return -ENOMEM;
 202
 203         oproc = rproc->priv;
 204         oproc->rproc = rproc;
 205         /* All existing OMAP IPU and DSP processors have an MMU */
 206         rproc->has_iommu = true;
 207
 208         platform_set_drvdata(pdev, rproc);
 209
 210         ret = rproc_add(rproc);
 211         if (ret)
 212                 goto free_rproc;
 213
 214         return 0;
 215
 216 free_rproc:
 217         rproc_put(rproc);
 218         return ret;
 219 }
 220
 221 static int omap_rproc_remove(struct platform_device *pdev)
 222 {
 223         struct rproc *rproc = platform_get_drvdata(pdev);
 224
 225         rproc_del(rproc);
 226         rproc_put(rproc);
 227
 228         return 0;
 229 }
 230
 231 static struct platform_driver omap_rproc_driver = {
 232         .probe = omap_rproc_probe,
 233         .remove = omap_rproc_remove,
 234         .driver = {
 235                 .name = "omap-rproc",
 236         },
 237 };
 238
 239 module_platform_driver(omap_rproc_driver);
 240
 241 MODULE_LICENSE("GPL v2");
 242 MODULE_DESCRIPTION("OMAP Remote Processor control driver");