From: Allen-KH Cheng <Allen-KH.Cheng@xxxxxxxxxxxx>
This patch is to for MediaTek ADSP IPC mailbox controller driver
It is used to send short messages between processors with adsp
Reviewed-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>
Signed-off-by: Allen-KH Cheng <Allen-KH.Cheng@xxxxxxxxxxxx>
---
drivers/mailbox/Kconfig | 7 ++
drivers/mailbox/Makefile | 2 +
drivers/mailbox/mtk-adsp-mailbox.c | 176 +++++++++++++++++++++++++++++
3 files changed, 185 insertions(+)
create mode 100644 drivers/mailbox/mtk-adsp-mailbox.c
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index d9cd3606040e..3e5bb745437d 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -238,6 +238,13 @@ 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
+ driver. It is used to send short messages between processors with dsp.
+
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..b8174f155f8d
--- /dev/null
+++ b/drivers/mailbox/mtk-adsp-mailbox.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021 MediaTek Corporation. All rights reserved.
+ * Author: Allen-KH Cheng <allen-kh.cheng@xxxxxxxxxxxx>
+ */
+
+#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 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[sp->args[0]];
+}
+
+static int mtk_adsp_mbox_startup(struct mbox_chan *chan)
+{
+ struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
+
+ /* Clear DSP 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 DSP 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@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("MTK ADSP Mailbox Controller");
+MODULE_LICENSE("GPL v2");
--
2.18.0
