From: Allen-KH Cheng Allen-KH.Cheng@mediatek.com

This patch is to for MediaTek ADSP IPC mailbox controller driver It is used to send short messages between processors with adsp

Signed-off-by: Allen-KH Cheng allen-kh.cheng@mediatek.com Reviewed-by: Tzung-Bi Shih tzungbi@google.com Reviewed-by: YC Hung yc.hung@mediatek.com Reviewed-by: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com --- drivers/mailbox/Kconfig | 9 ++ drivers/mailbox/Makefile | 2 + drivers/mailbox/mtk-adsp-mailbox.c | 176 +++++++++++++++++++++++++++++ 3 files changed, 187 insertions(+) create mode 100644 drivers/mailbox/mtk-adsp-mailbox.c

diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig index d9cd3606040e..05d6fae800e3 100644 --- a/drivers/mailbox/Kconfig +++ b/drivers/mailbox/Kconfig @@ -238,6 +238,15 @@ config STM32_IPCC with hardware for Inter-Processor Communication Controller (IPCC) between processors. Say Y here if you want to have this support.

+config MTK_ADSP_MBOX + tristate "MediaTek ADSP Mailbox Controller" + depends on ARCH_MEDIATEK || COMPILE_TEST + help + Say yes here to add support for "MediaTek ADSP Mailbox Controller. + This mailbox driver is used to send notification or short message + between processors with ADSP. It will place the message to share + buffer and will access the ipc control. + config MTK_CMDQ_MBOX tristate "MediaTek CMDQ Mailbox Support" depends on ARCH_MEDIATEK || COMPILE_TEST diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile index 338cc05e5431..fc9376117111 100644 --- a/drivers/mailbox/Makefile +++ b/drivers/mailbox/Makefile @@ -49,6 +49,8 @@ obj-$(CONFIG_TEGRA_HSP_MBOX) += tegra-hsp.o

obj-$(CONFIG_STM32_IPCC) += stm32-ipcc.o

+obj-$(CONFIG_MTK_ADSP_MBOX) += mtk-adsp-mailbox.o + obj-$(CONFIG_MTK_CMDQ_MBOX) += mtk-cmdq-mailbox.o

obj-$(CONFIG_ZYNQMP_IPI_MBOX) += zynqmp-ipi-mailbox.o diff --git a/drivers/mailbox/mtk-adsp-mailbox.c b/drivers/mailbox/mtk-adsp-mailbox.c new file mode 100644 index 000000000000..5e7378090c7b --- /dev/null +++ b/drivers/mailbox/mtk-adsp-mailbox.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2022 MediaTek Corporation. All rights reserved. + * Author: Allen-KH Cheng allen-kh.cheng@mediatek.com + */ + +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/kernel.h> +#include <linux/mailbox_controller.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/slab.h> + +struct mtk_adsp_mbox_priv { + struct device *dev; + struct mbox_controller mbox; + void __iomem *va_mboxreg; + const struct mtk_adsp_mbox_cfg *cfg; +}; + +struct mtk_adsp_mbox_cfg { + u32 set_in; + u32 set_out; + u32 clr_in; + u32 clr_out; +}; + +static inline struct mtk_adsp_mbox_priv *get_mtk_adsp_mbox_priv(struct mbox_controller *mbox) +{ + return container_of(mbox, struct mtk_adsp_mbox_priv, mbox); +} + +static irqreturn_t mtk_adsp_mbox_irq(int irq, void *data) +{ + struct mbox_chan *chan = data; + struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox); + u32 op = readl(priv->va_mboxreg + priv->cfg->set_out); + + writel(op, priv->va_mboxreg + priv->cfg->clr_out); + + return IRQ_WAKE_THREAD; +} + +static irqreturn_t mtk_adsp_mbox_isr(int irq, void *data) +{ + struct mbox_chan *chan = data; + + mbox_chan_received_data(chan, NULL); + + return IRQ_HANDLED; +} + +static struct mbox_chan *mtk_adsp_mbox_xlate(struct mbox_controller *mbox, + const struct of_phandle_args *sp) +{ + return mbox->chans; +} + +static int mtk_adsp_mbox_startup(struct mbox_chan *chan) +{ + struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox); + + /* Clear ADSP mbox command */ + writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in); + writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out); + + return 0; +} + +static void mtk_adsp_mbox_shutdown(struct mbox_chan *chan) +{ + struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox); + + /* Clear ADSP mbox command */ + writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in); + writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out); +} + +static int mtk_adsp_mbox_send_data(struct mbox_chan *chan, void *data) +{ + struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox); + u32 *msg = data; + + writel(*msg, priv->va_mboxreg + priv->cfg->set_in); + + return 0; +} + +static bool mtk_adsp_mbox_last_tx_done(struct mbox_chan *chan) +{ + struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox); + + return readl(priv->va_mboxreg + priv->cfg->set_in) == 0; +} + +static const struct mbox_chan_ops mtk_adsp_mbox_chan_ops = { + .send_data = mtk_adsp_mbox_send_data, + .startup = mtk_adsp_mbox_startup, + .shutdown = mtk_adsp_mbox_shutdown, + .last_tx_done = mtk_adsp_mbox_last_tx_done, +}; + +static int mtk_adsp_mbox_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mtk_adsp_mbox_priv *priv; + const struct mtk_adsp_mbox_cfg *cfg; + struct mbox_controller *mbox; + int ret, irq; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + mbox = &priv->mbox; + mbox->dev = dev; + mbox->ops = &mtk_adsp_mbox_chan_ops; + mbox->txdone_irq = false; + mbox->txdone_poll = true; + mbox->of_xlate = mtk_adsp_mbox_xlate; + mbox->num_chans = 1; + mbox->chans = devm_kzalloc(dev, sizeof(*mbox->chans), GFP_KERNEL); + if (!mbox->chans) + return -ENOMEM; + + priv->va_mboxreg = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->va_mboxreg)) + return PTR_ERR(priv->va_mboxreg); + + cfg = of_device_get_match_data(dev); + if (!cfg) + return -EINVAL; + priv->cfg = cfg; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + ret = devm_request_threaded_irq(dev, irq, mtk_adsp_mbox_irq, + mtk_adsp_mbox_isr, IRQF_TRIGGER_NONE, + dev_name(dev), mbox->chans); + if (ret < 0) + return ret; + + platform_set_drvdata(pdev, priv); + + return devm_mbox_controller_register(dev, &priv->mbox); +} + +static const struct mtk_adsp_mbox_cfg mt8195_adsp_mbox_cfg = { + .set_in = 0x00, + .set_out = 0x1c, + .clr_in = 0x04, + .clr_out = 0x20, +}; + +static const struct of_device_id mtk_adsp_mbox_of_match[] = { + { .compatible = "mediatek,mt8195-adsp-mbox", .data = &mt8195_adsp_mbox_cfg }, + {}, +}; +MODULE_DEVICE_TABLE(of, mtk_adsp_mbox_of_match); + +static struct platform_driver mtk_adsp_mbox_driver = { + .probe = mtk_adsp_mbox_probe, + .driver = { + .name = "mtk_adsp_mbox", + .of_match_table = mtk_adsp_mbox_of_match, + }, +}; +module_platform_driver(mtk_adsp_mbox_driver); + +MODULE_AUTHOR("Allen-KH Cheng Allen-KH.Cheng@mediatek.com"); +MODULE_DESCRIPTION("MTK ADSP Mailbox Controller"); +MODULE_LICENSE("GPL v2");