mailbox: meson-mx-ao-arc-mbox: Add a driver for the Meson MX AO ARC mbox (da56261a) · Commits · 戴 / test

drivers/mailbox/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -59,6 +59,15 @@ config ARMADA_37XX_RWTM_MBOX
		SOC. Say Y here if you are building for such a device (for example
		the Turris Mox router).

		config MESON_MX_AO_ARC_MAILBOX
		tristate "Amlogic Meson6/8/8b/8m2 AO ARC mailbox support"
		depends on HAS_IOMEM
		depends on (ARM && ARCH_MESON) \|\| COMPILE_TEST
		help
		Say m or y here to have support for the AO ARC remote processor
		mailbox on Amlogic Meson6/Meson8/Meson8b/Meson8m2 SoCs.
		If unusre say N.

		config OMAP2PLUS_MBOX
		tristate "OMAP2+ Mailbox framework support"
		depends on ARCH_OMAP2PLUS \|\| ARCH_K3

drivers/mailbox/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -17,6 +17,8 @@ obj-$(CONFIG_PLATFORM_MHU) += platform_mhu.o

		obj-$(CONFIG_PL320_MBOX) += pl320-ipc.o

		obj-$(CONFIG_MESON_MX_AO_ARC_MAILBOX) += meson-mx-ao-arc-mailbox.o

		obj-$(CONFIG_OMAP2PLUS_MBOX) += omap-mailbox.o

		obj-$(CONFIG_ROCKCHIP_MBOX) += rockchip-mailbox.o

drivers/mailbox/meson-mx-ao-arc-mailbox.c

0 → 100644

+107 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0-or-later
		/*
		* Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/io.h>
		#include <linux/slab.h>
		#include <linux/of.h>
		#include <linux/of_platform.h>
		#include <linux/platform_device.h>
		#include <linux/mailbox_controller.h>

		#define MESON_MX_AO_ARC_NUM_CHANS 3

		struct meson_mx_ao_arc_mbox {
		struct mbox_chan chans[MESON_MX_AO_ARC_NUM_CHANS];
		struct mbox_controller mbox;
		};

		static void* __iomem meson_mx_ao_arc_mbox_iomem(struct mbox_chan *chan)
		{
		return (void* __iomem)chan->con_priv;
		}

		static int meson_mx_ao_arc_mbox_send_data(struct mbox_chan chan, void data)
		{

		u32 *arg = data;

		writel_relaxed(*arg, meson_mx_ao_arc_mbox_iomem(chan));

		return 0;
		}

		static int meson_mx_ao_arc_mbox_startup(struct mbox_chan *chan)
		{
		u32 data = 0;

		return meson_mx_ao_arc_mbox_send_data(chan, &data);
		}

		static bool meson_mx_ao_arc_mbox_last_tx_done(struct mbox_chan *chan)
		{

		return readl_relaxed(meson_mx_ao_arc_mbox_iomem(chan)) == 0;
		}

		static const struct mbox_chan_ops meson_mx_ao_arc_mbox_ops = {
		.send_data = meson_mx_ao_arc_mbox_send_data,
		.startup = meson_mx_ao_arc_mbox_startup,
		.last_tx_done = meson_mx_ao_arc_mbox_last_tx_done,
		};

		static int meson_mx_ao_arc_mbox_probe(struct platform_device *pdev)
		{
		struct meson_mx_ao_arc_mbox *priv;
		struct device *dev = &pdev->dev;
		void __iomem *base;
		int i, ret;

		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
		if (!priv)
		return -ENOMEM;

		base = devm_platform_ioremap_resource(pdev, 0);
		if (IS_ERR(base))
		return PTR_ERR(base);

		for (i = 0; i < MESON_MX_AO_ARC_NUM_CHANS; i++)
		priv->chans[i].con_priv = base + (i * sizeof(u32));

		priv->mbox.dev = dev;
		priv->mbox.ops = &meson_mx_ao_arc_mbox_ops;
		priv->mbox.txpoll_period = 5;
		priv->mbox.txdone_poll = true;
		priv->mbox.chans = priv->chans;
		priv->mbox.num_chans = MESON_MX_AO_ARC_NUM_CHANS;

		ret = devm_mbox_controller_register(dev, &priv->mbox);
		if (ret) {
		dev_err(dev, "Failed to register AO ARC mailbox controller\n");
		return ret;
		}

		return 0;
		}

		static const struct of_device_id meson_mx_ao_arc_mbox_of_match[] = {
		{ .compatible = "amlogic,meson-mx-ao-arc-mbox" },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(of, meson_mx_ao_arc_mbox_of_match);

		static struct platform_driver meson_mx_ao_arc_mbox_driver = {
		.probe = meson_mx_ao_arc_mbox_probe,
		.driver = {
		.name = "meson-mx-ao-arc-mbox",
		.of_match_table = meson_mx_ao_arc_mbox_of_match,
		},
		};
		module_platform_driver(meson_mx_ao_arc_mbox_driver);

		MODULE_DESCRIPTION("Amlogic Meson6/8/8b/8m2 AO ARC mailbox driver");
		MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
		MODULE_LICENSE("GPL v2");

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