diff options
Diffstat (limited to 'drivers/mailbox/mtk-vcp-mailbox.c')
| -rw-r--r-- | drivers/mailbox/mtk-vcp-mailbox.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/drivers/mailbox/mtk-vcp-mailbox.c b/drivers/mailbox/mtk-vcp-mailbox.c new file mode 100644 index 000000000000..cedad575528f --- /dev/null +++ b/drivers/mailbox/mtk-vcp-mailbox.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2025 MediaTek Corporation. All rights reserved. + * Author: Jjian Zhou <jjian.zhou.@mediatek.com> + */ + +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/mailbox_controller.h> +#include <linux/mailbox/mtk-vcp-mailbox.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +struct mtk_vcp_mbox { + struct mbox_controller mbox; + void __iomem *base; + struct device *dev; + const struct mtk_vcp_mbox_cfg *cfg; + struct mtk_ipi_info ipi_recv; + struct mbox_chan chans; +}; + +struct mtk_vcp_mbox_cfg { + u16 set_in; + u16 clr_out; +}; + +static irqreturn_t mtk_vcp_mbox_irq_thread(int irq, void *data) +{ + struct mtk_vcp_mbox *priv = data; + + /* get irq status */ + priv->ipi_recv.irq_status = readl(priv->base + priv->cfg->clr_out); + + __ioread32_copy(priv->ipi_recv.msg, priv->base, + MTK_VCP_MBOX_SLOT_MAX_SIZE / 4); + + mbox_chan_received_data(&priv->chans, &priv->ipi_recv); + + /* clear irq status */ + writel(priv->ipi_recv.irq_status, priv->base + priv->cfg->clr_out); + + return IRQ_HANDLED; +} + +static struct mbox_chan *mtk_vcp_mbox_xlate(struct mbox_controller *mbox, + const struct of_phandle_args *sp) +{ + if (sp->args_count) + return NULL; + + return &mbox->chans[0]; +} + +static int mtk_vcp_mbox_send_data(struct mbox_chan *chan, void *data) +{ + struct mtk_vcp_mbox *priv = chan->con_priv; + struct mtk_ipi_info *ipi_info = data; + u32 status; + + if (!ipi_info->msg) { + dev_err(priv->dev, "msg buffer is NULL.\n"); + return -EINVAL; + } + + status = readl(priv->base + priv->cfg->set_in); + if (status & BIT(ipi_info->index)) { + dev_warn(priv->dev, "mailbox IPI %d is busy.\n", ipi_info->id); + return -EBUSY; + } + + if (ipi_info->slot_ofs + ipi_info->len > MTK_VCP_MBOX_SLOT_MAX_SIZE) + return -EINVAL; + __iowrite32_copy(priv->base + ipi_info->slot_ofs, ipi_info->msg, + ipi_info->len); + + writel(BIT(ipi_info->index), priv->base + priv->cfg->set_in); + + return 0; +} + +static bool mtk_vcp_mbox_last_tx_done(struct mbox_chan *chan) +{ + struct mtk_ipi_info *ipi_info = chan->active_req; + struct mtk_vcp_mbox *priv = chan->con_priv; + + return !(readl(priv->base + priv->cfg->set_in) & BIT(ipi_info->index)); +} + +static const struct mbox_chan_ops mtk_vcp_mbox_chan_ops = { + .send_data = mtk_vcp_mbox_send_data, + .last_tx_done = mtk_vcp_mbox_last_tx_done, +}; + +static int mtk_vcp_mbox_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mtk_vcp_mbox *priv; + struct mbox_controller *mbox; + int ret, irq; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + priv->chans.con_priv = priv; + mbox = &priv->mbox; + mbox->dev = dev; + mbox->ops = &mtk_vcp_mbox_chan_ops; + mbox->txdone_irq = false; + mbox->txdone_poll = true; + mbox->of_xlate = mtk_vcp_mbox_xlate; + mbox->num_chans = 1; + mbox->chans = &priv->chans; + + priv->ipi_recv.msg = devm_kzalloc(dev, MTK_VCP_MBOX_SLOT_MAX_SIZE, + GFP_KERNEL); + if (!priv->ipi_recv.msg) + return -ENOMEM; + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + priv->cfg = of_device_get_match_data(dev); + if (!priv->cfg) + return -EINVAL; + + platform_set_drvdata(pdev, priv); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + ret = devm_request_threaded_irq(dev, irq, NULL, + mtk_vcp_mbox_irq_thread, IRQF_ONESHOT, + dev_name(dev), priv); + if (ret < 0) + return ret; + + return devm_mbox_controller_register(dev, &priv->mbox); +} + +static const struct mtk_vcp_mbox_cfg mt8196_cfg = { + .set_in = 0x100, + .clr_out = 0x10c, +}; + +static const struct of_device_id mtk_vcp_mbox_of_match[] = { + { .compatible = "mediatek,mt8196-vcp-mbox", .data = &mt8196_cfg }, + {}, +}; +MODULE_DEVICE_TABLE(of, mtk_vcp_mbox_of_match); + +static struct platform_driver mtk_vcp_mbox_driver = { + .probe = mtk_vcp_mbox_probe, + .driver = { + .name = "mtk_vcp_mbox", + .of_match_table = mtk_vcp_mbox_of_match, + }, +}; +module_platform_driver(mtk_vcp_mbox_driver); + +MODULE_AUTHOR("Jjian Zhou <jjian.zhou@mediatek.com>"); +MODULE_DESCRIPTION("MTK VCP Mailbox Controller"); +MODULE_LICENSE("GPL"); |