mailbox: mediatek: add support for adsp mailbox controller

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>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index d9cd3606040e7ee88f92711fce857df2db3c9e49..05d6fae800e372e00f69ef77041d08c5123e5f5c 100644 (file)
--- 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 338cc05e5431f6fda076665e7202f5729e6047fc..fc93761171113ea94d079de1b4772722467247e7 100644 (file)
--- 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 (file)
index 0000000..5e73780
--- /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");