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0e4e8cc30a
IMX DSP device is created by SOF layer. The current call to
devm_of_platform_populate is not needed and it doesn't produce
any effects.
Fixes: ffbf23d503 ("firmware: imx: Add DSP IPC protocol interface)
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
156 lines
3.4 KiB
C
156 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2019 NXP
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* Author: Daniel Baluta <daniel.baluta@nxp.com>
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*
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* Implementation of the DSP IPC interface (host side)
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*/
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#include <linux/firmware/imx/dsp.h>
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#include <linux/kernel.h>
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#include <linux/mailbox_client.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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/*
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* imx_dsp_ring_doorbell - triggers an interrupt on the other side (DSP)
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*
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* @dsp: DSP IPC handle
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* @chan_idx: index of the channel where to trigger the interrupt
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*
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* Returns non-negative value for success, negative value for error
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*/
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int imx_dsp_ring_doorbell(struct imx_dsp_ipc *ipc, unsigned int idx)
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{
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int ret;
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struct imx_dsp_chan *dsp_chan;
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if (idx >= DSP_MU_CHAN_NUM)
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return -EINVAL;
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dsp_chan = &ipc->chans[idx];
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ret = mbox_send_message(dsp_chan->ch, NULL);
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if (ret < 0)
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return ret;
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return 0;
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}
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EXPORT_SYMBOL(imx_dsp_ring_doorbell);
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/*
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* imx_dsp_handle_rx - rx callback used by imx mailbox
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*
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* @c: mbox client
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* @msg: message received
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*
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* Users of DSP IPC will need to privde handle_reply and handle_request
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* callbacks.
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*/
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static void imx_dsp_handle_rx(struct mbox_client *c, void *msg)
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{
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struct imx_dsp_chan *chan = container_of(c, struct imx_dsp_chan, cl);
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if (chan->idx == 0) {
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chan->ipc->ops->handle_reply(chan->ipc);
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} else {
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chan->ipc->ops->handle_request(chan->ipc);
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imx_dsp_ring_doorbell(chan->ipc, 1);
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}
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}
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static int imx_dsp_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct imx_dsp_ipc *dsp_ipc;
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struct imx_dsp_chan *dsp_chan;
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struct mbox_client *cl;
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char *chan_name;
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int ret;
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int i, j;
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device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
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dsp_ipc = devm_kzalloc(dev, sizeof(*dsp_ipc), GFP_KERNEL);
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if (!dsp_ipc)
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return -ENOMEM;
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for (i = 0; i < DSP_MU_CHAN_NUM; i++) {
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if (i < 2)
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chan_name = kasprintf(GFP_KERNEL, "txdb%d", i);
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else
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chan_name = kasprintf(GFP_KERNEL, "rxdb%d", i - 2);
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if (!chan_name)
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return -ENOMEM;
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dsp_chan = &dsp_ipc->chans[i];
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cl = &dsp_chan->cl;
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cl->dev = dev;
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cl->tx_block = false;
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cl->knows_txdone = true;
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cl->rx_callback = imx_dsp_handle_rx;
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dsp_chan->ipc = dsp_ipc;
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dsp_chan->idx = i % 2;
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dsp_chan->ch = mbox_request_channel_byname(cl, chan_name);
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if (IS_ERR(dsp_chan->ch)) {
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ret = PTR_ERR(dsp_chan->ch);
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if (ret != -EPROBE_DEFER)
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dev_err(dev, "Failed to request mbox chan %s ret %d\n",
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chan_name, ret);
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goto out;
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}
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dev_dbg(dev, "request mbox chan %s\n", chan_name);
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/* chan_name is not used anymore by framework */
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kfree(chan_name);
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}
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dsp_ipc->dev = dev;
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dev_set_drvdata(dev, dsp_ipc);
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dev_info(dev, "NXP i.MX DSP IPC initialized\n");
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return 0;
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out:
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kfree(chan_name);
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for (j = 0; j < i; j++) {
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dsp_chan = &dsp_ipc->chans[j];
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mbox_free_channel(dsp_chan->ch);
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}
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return ret;
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}
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static int imx_dsp_remove(struct platform_device *pdev)
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{
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struct imx_dsp_chan *dsp_chan;
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struct imx_dsp_ipc *dsp_ipc;
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int i;
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dsp_ipc = dev_get_drvdata(&pdev->dev);
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for (i = 0; i < DSP_MU_CHAN_NUM; i++) {
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dsp_chan = &dsp_ipc->chans[i];
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mbox_free_channel(dsp_chan->ch);
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}
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return 0;
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}
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static struct platform_driver imx_dsp_driver = {
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.driver = {
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.name = "imx-dsp",
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},
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.probe = imx_dsp_probe,
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.remove = imx_dsp_remove,
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};
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builtin_platform_driver(imx_dsp_driver);
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MODULE_AUTHOR("Daniel Baluta <daniel.baluta@nxp.com>");
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MODULE_DESCRIPTION("IMX DSP IPC protocol driver");
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MODULE_LICENSE("GPL v2");
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