230 lines
6.0 KiB
C
230 lines
6.0 KiB
C
/*
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* OMAP Remote Processor driver
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Copyright (C) 2011 Google, Inc.
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*
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* Ohad Ben-Cohen <ohad@wizery.com>
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* Brian Swetland <swetland@google.com>
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* Fernando Guzman Lugo <fernando.lugo@ti.com>
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* Mark Grosen <mgrosen@ti.com>
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* Suman Anna <s-anna@ti.com>
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* Hari Kanigeri <h-kanigeri2@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/remoteproc.h>
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#include <plat/mailbox.h>
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#include <plat/remoteproc.h>
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#include "omap_remoteproc.h"
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#include "remoteproc_internal.h"
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/**
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* struct omap_rproc - omap remote processor state
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* @mbox: omap mailbox handle
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* @nb: notifier block that will be invoked on inbound mailbox messages
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* @rproc: rproc handle
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*/
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struct omap_rproc {
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struct omap_mbox *mbox;
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struct notifier_block nb;
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struct rproc *rproc;
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};
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/**
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* omap_rproc_mbox_callback() - inbound mailbox message handler
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* @this: notifier block
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* @index: unused
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* @data: mailbox payload
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*
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* This handler is invoked by omap's mailbox driver whenever a mailbox
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* message is received. Usually, the mailbox payload simply contains
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* the index of the virtqueue that is kicked by the remote processor,
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* and we let remoteproc core handle it.
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*
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* In addition to virtqueue indices, we also have some out-of-band values
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* that indicates different events. Those values are deliberately very
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* big so they don't coincide with virtqueue indices.
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*/
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static int omap_rproc_mbox_callback(struct notifier_block *this,
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unsigned long index, void *data)
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{
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mbox_msg_t msg = (mbox_msg_t) data;
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struct omap_rproc *oproc = container_of(this, struct omap_rproc, nb);
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struct device *dev = oproc->rproc->dev;
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const char *name = oproc->rproc->name;
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dev_dbg(dev, "mbox msg: 0x%x\n", msg);
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switch (msg) {
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case RP_MBOX_CRASH:
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/* just log this for now. later, we'll also do recovery */
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dev_err(dev, "omap rproc %s crashed\n", name);
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break;
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case RP_MBOX_ECHO_REPLY:
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dev_info(dev, "received echo reply from %s\n", name);
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break;
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default:
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/* msg contains the index of the triggered vring */
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if (rproc_vq_interrupt(oproc->rproc, msg) == IRQ_NONE)
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dev_dbg(dev, "no message was found in vqid %d\n", msg);
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}
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return NOTIFY_DONE;
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}
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/* kick a virtqueue */
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static void omap_rproc_kick(struct rproc *rproc, int vqid)
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{
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struct omap_rproc *oproc = rproc->priv;
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int ret;
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/* send the index of the triggered virtqueue in the mailbox payload */
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ret = omap_mbox_msg_send(oproc->mbox, vqid);
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if (ret)
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dev_err(rproc->dev, "omap_mbox_msg_send failed: %d\n", ret);
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}
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/*
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* Power up the remote processor.
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*
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* This function will be invoked only after the firmware for this rproc
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* was loaded, parsed successfully, and all of its resource requirements
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* were met.
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*/
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static int omap_rproc_start(struct rproc *rproc)
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{
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struct omap_rproc *oproc = rproc->priv;
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struct platform_device *pdev = to_platform_device(rproc->dev);
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struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
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int ret;
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oproc->nb.notifier_call = omap_rproc_mbox_callback;
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/* every omap rproc is assigned a mailbox instance for messaging */
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oproc->mbox = omap_mbox_get(pdata->mbox_name, &oproc->nb);
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if (IS_ERR(oproc->mbox)) {
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ret = PTR_ERR(oproc->mbox);
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dev_err(rproc->dev, "omap_mbox_get failed: %d\n", ret);
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return ret;
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}
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/*
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* Ping the remote processor. this is only for sanity-sake;
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* there is no functional effect whatsoever.
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*
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* Note that the reply will _not_ arrive immediately: this message
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* will wait in the mailbox fifo until the remote processor is booted.
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*/
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ret = omap_mbox_msg_send(oproc->mbox, RP_MBOX_ECHO_REQUEST);
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if (ret) {
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dev_err(rproc->dev, "omap_mbox_get failed: %d\n", ret);
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goto put_mbox;
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}
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ret = pdata->device_enable(pdev);
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if (ret) {
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dev_err(rproc->dev, "omap_device_enable failed: %d\n", ret);
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goto put_mbox;
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}
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return 0;
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put_mbox:
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omap_mbox_put(oproc->mbox, &oproc->nb);
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return ret;
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}
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/* power off the remote processor */
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static int omap_rproc_stop(struct rproc *rproc)
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{
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struct platform_device *pdev = to_platform_device(rproc->dev);
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struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
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struct omap_rproc *oproc = rproc->priv;
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int ret;
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ret = pdata->device_shutdown(pdev);
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if (ret)
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return ret;
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omap_mbox_put(oproc->mbox, &oproc->nb);
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return 0;
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}
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static struct rproc_ops omap_rproc_ops = {
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.start = omap_rproc_start,
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.stop = omap_rproc_stop,
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.kick = omap_rproc_kick,
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};
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static int __devinit omap_rproc_probe(struct platform_device *pdev)
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{
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struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
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struct omap_rproc *oproc;
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struct rproc *rproc;
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int ret;
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ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
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if (ret) {
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dev_err(pdev->dev.parent, "dma_set_coherent_mask: %d\n", ret);
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return ret;
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}
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rproc = rproc_alloc(&pdev->dev, pdata->name, &omap_rproc_ops,
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pdata->firmware, sizeof(*oproc));
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if (!rproc)
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return -ENOMEM;
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oproc = rproc->priv;
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oproc->rproc = rproc;
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platform_set_drvdata(pdev, rproc);
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ret = rproc_register(rproc);
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if (ret)
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goto free_rproc;
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return 0;
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free_rproc:
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rproc_free(rproc);
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return ret;
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}
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static int __devexit omap_rproc_remove(struct platform_device *pdev)
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{
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struct rproc *rproc = platform_get_drvdata(pdev);
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return rproc_unregister(rproc);
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}
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static struct platform_driver omap_rproc_driver = {
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.probe = omap_rproc_probe,
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.remove = __devexit_p(omap_rproc_remove),
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.driver = {
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.name = "omap-rproc",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(omap_rproc_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("OMAP Remote Processor control driver");
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