forked from libretro/Lakka-LibreELEC
123 lines
3.7 KiB
Diff
123 lines
3.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Samuel Holland <samuel@sholland.org>
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Date: Tue, 5 Mar 2019 22:02:41 -0600
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Subject: [PATCH] firmware: arm_scpi: Support unidirectional mailbox channels
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Some mailbox controllers have only unidirectional channels, so we need a
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pair of them for each SCPI channel. If a mbox-names property is present,
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look for "rx" and "tx" mbox channels; otherwise, the existing behavior
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is preserved, and a single mbox channel is used for each SCPI channel.
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Note that since the mailbox framework only supports a single phandle
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with each name (mbox_request_channel_byname always returns the first
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one), this new mode only supports a single SCPI channel.
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Signed-off-by: Samuel Holland <samuel@sholland.org>
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---
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drivers/firmware/arm_scpi.c | 58 +++++++++++++++++++++++++++++--------
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1 file changed, 46 insertions(+), 12 deletions(-)
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--- a/drivers/firmware/arm_scpi.c
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+++ b/drivers/firmware/arm_scpi.c
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@@ -231,7 +231,8 @@ struct scpi_xfer {
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struct scpi_chan {
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struct mbox_client cl;
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- struct mbox_chan *chan;
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+ struct mbox_chan *rx_chan;
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+ struct mbox_chan *tx_chan;
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void __iomem *tx_payload;
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void __iomem *rx_payload;
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struct list_head rx_pending;
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@@ -505,7 +506,7 @@ static int scpi_send_message(u8 idx, voi
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msg->rx_len = rx_len;
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reinit_completion(&msg->done);
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- ret = mbox_send_message(scpi_chan->chan, msg);
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+ ret = mbox_send_message(scpi_chan->tx_chan, msg);
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if (ret < 0 || !rx_buf)
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goto out;
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@@ -856,8 +857,13 @@ static void scpi_free_channels(void *dat
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struct scpi_drvinfo *info = data;
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int i;
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- for (i = 0; i < info->num_chans; i++)
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- mbox_free_channel(info->channels[i].chan);
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+ for (i = 0; i < info->num_chans; i++) {
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+ struct scpi_chan *pchan = &info->channels[i];
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+
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+ if (pchan->tx_chan != pchan->rx_chan)
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+ mbox_free_channel(pchan->tx_chan);
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+ mbox_free_channel(pchan->rx_chan);
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+ }
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}
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static int scpi_remove(struct platform_device *pdev)
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@@ -913,6 +919,7 @@ static int scpi_probe(struct platform_de
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct scpi_drvinfo *scpi_drvinfo;
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+ bool use_mbox_names = false;
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scpi_drvinfo = devm_kzalloc(dev, sizeof(*scpi_drvinfo), GFP_KERNEL);
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if (!scpi_drvinfo)
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@@ -926,6 +933,14 @@ static int scpi_probe(struct platform_de
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dev_err(dev, "no mboxes property in '%pOF'\n", np);
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return -ENODEV;
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}
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+ if (of_get_property(dev->of_node, "mbox-names", NULL)) {
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+ use_mbox_names = true;
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+ if (count != 2) {
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+ dev_err(dev, "need exactly 2 mboxes with mbox-names\n");
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+ return -ENODEV;
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+ }
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+ count /= 2;
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+ }
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scpi_info->channels = devm_kcalloc(dev, count, sizeof(struct scpi_chan),
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GFP_KERNEL);
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@@ -974,15 +989,34 @@ static int scpi_probe(struct platform_de
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mutex_init(&pchan->xfers_lock);
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ret = scpi_alloc_xfer_list(dev, pchan);
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- if (!ret) {
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- pchan->chan = mbox_request_channel(cl, idx);
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- if (!IS_ERR(pchan->chan))
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- continue;
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- ret = PTR_ERR(pchan->chan);
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- if (ret != -EPROBE_DEFER)
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- dev_err(dev, "failed to get channel%d err %d\n",
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- idx, ret);
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+ if (ret)
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+ return ret;
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+
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+ if (use_mbox_names) {
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+ pchan->rx_chan = mbox_request_channel_byname(cl, "rx");
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+ if (IS_ERR(pchan->rx_chan)) {
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+ ret = PTR_ERR(pchan->rx_chan);
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+ goto fail;
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+ }
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+ pchan->tx_chan = mbox_request_channel_byname(cl, "tx");
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+ if (IS_ERR(pchan->rx_chan)) {
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+ ret = PTR_ERR(pchan->tx_chan);
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+ goto fail;
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+ }
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+ } else {
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+ pchan->rx_chan = mbox_request_channel(cl, idx);
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+ if (IS_ERR(pchan->rx_chan)) {
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+ ret = PTR_ERR(pchan->rx_chan);
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+ goto fail;
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+ }
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+ pchan->tx_chan = pchan->rx_chan;
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}
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+ continue;
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+
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+fail:
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+ if (ret != -EPROBE_DEFER)
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+ dev_err(dev, "failed to get channel%d err %d\n",
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+ idx, ret);
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return ret;
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}
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