@@ -16,6 +16,13 @@ config ARM_MHU
The controller has 3 mailbox channels, the last of which can be
used in Secure mode only.
+config ARM_SMC_MBOX
+ tristate "Generic ARM smc mailbox"
+ depends on OF && HAVE_ARM_SMCCC
+ help
+ Generic mailbox driver which uses ARM smc calls to call into
+ firmware for triggering mailboxes.
+
config IMX_MBOX
tristate "i.MX Mailbox"
depends on ARCH_MXC || COMPILE_TEST
@@ -7,6 +7,8 @@ obj-$(CONFIG_MAILBOX_TEST) += mailbox-test.o
obj-$(CONFIG_ARM_MHU) += arm_mhu.o
+obj-$(CONFIG_ARM_SMC_MBOX) += arm-smc-mailbox.o
+
obj-$(CONFIG_IMX_MBOX) += imx-mailbox.o
obj-$(CONFIG_ARMADA_37XX_RWTM_MBOX) += armada-37xx-rwtm-mailbox.o
new file mode 100644
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2016,2017 ARM Ltd.
+ * Copyright 2019 NXP
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/mailbox_controller.h>
+#include <linux/mailbox/arm-smccc-mbox.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+struct arm_smc_chan_data {
+ unsigned int function_id;
+};
+
+typedef unsigned long (smc_mbox_fn)(unsigned int, unsigned long,
+ unsigned long, unsigned long,
+ unsigned long, unsigned long,
+ unsigned long);
+static smc_mbox_fn *invoke_smc_mbox_fn;
+
+static int arm_smc_send_data(struct mbox_chan *link, void *data)
+{
+ struct arm_smc_chan_data *chan_data = link->con_priv;
+ struct arm_smccc_mbox_cmd *cmd = data;
+ unsigned long ret;
+ u32 function_id;
+
+ function_id = chan_data->function_id;
+ if (!function_id)
+ function_id = cmd->function_id;
+
+ if (ARM_SMCCC_IS_64(function_id)) {
+ ret = invoke_smc_mbox_fn(function_id, cmd->args_smccc64[0],
+ cmd->args_smccc64[1],
+ cmd->args_smccc64[2],
+ cmd->args_smccc64[3],
+ cmd->args_smccc64[4],
+ cmd->args_smccc64[5]);
+ } else {
+ ret = invoke_smc_mbox_fn(function_id, cmd->args_smccc32[0],
+ cmd->args_smccc32[1],
+ cmd->args_smccc32[2],
+ cmd->args_smccc32[3],
+ cmd->args_smccc32[4],
+ cmd->args_smccc32[5]);
+ }
+
+ mbox_chan_received_data(link, (void *)ret);
+
+ return 0;
+}
+
+static unsigned long __invoke_fn_hvc(unsigned int function_id,
+ unsigned long arg0, unsigned long arg1,
+ unsigned long arg2, unsigned long arg3,
+ unsigned long arg4, unsigned long arg5)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_hvc(function_id, arg0, arg1, arg2, arg3, arg4,
+ arg5, 0, &res);
+ return res.a0;
+}
+
+static unsigned long __invoke_fn_smc(unsigned int function_id,
+ unsigned long arg0, unsigned long arg1,
+ unsigned long arg2, unsigned long arg3,
+ unsigned long arg4, unsigned long arg5)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_smc(function_id, arg0, arg1, arg2, arg3, arg4,
+ arg5, 0, &res);
+ return res.a0;
+}
+
+static const struct mbox_chan_ops arm_smc_mbox_chan_ops = {
+ .send_data = arm_smc_send_data,
+};
+
+static struct mbox_chan *
+arm_smc_mbox_of_xlate(struct mbox_controller *mbox,
+ const struct of_phandle_args *sp)
+{
+ return mbox->chans;
+}
+
+static int arm_smc_mbox_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mbox_controller *mbox;
+ struct arm_smc_chan_data *chan_data;
+ int ret;
+ u32 function_id = 0;
+
+ if (of_device_is_compatible(dev->of_node, "arm,smc-mbox"))
+ invoke_smc_mbox_fn = __invoke_fn_smc;
+ else
+ invoke_smc_mbox_fn = __invoke_fn_hvc;
+
+ mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
+ if (!mbox)
+ return -ENOMEM;
+
+ mbox->of_xlate = arm_smc_mbox_of_xlate;
+ mbox->num_chans = 1;
+ mbox->chans = devm_kzalloc(dev, sizeof(*mbox->chans), GFP_KERNEL);
+ if (!mbox->chans)
+ return -ENOMEM;
+
+ chan_data = devm_kzalloc(dev, sizeof(*chan_data), GFP_KERNEL);
+ if (!chan_data)
+ return -ENOMEM;
+
+ of_property_read_u32(dev->of_node, "arm,func-id", &function_id);
+ chan_data->function_id = function_id;
+
+ mbox->chans->con_priv = chan_data;
+
+ mbox->txdone_poll = false;
+ mbox->txdone_irq = false;
+ mbox->ops = &arm_smc_mbox_chan_ops;
+ mbox->dev = dev;
+
+ platform_set_drvdata(pdev, mbox);
+
+ ret = devm_mbox_controller_register(dev, mbox);
+ if (ret)
+ return ret;
+
+ dev_info(dev, "ARM SMC mailbox enabled.\n");
+
+ return ret;
+}
+
+static int arm_smc_mbox_remove(struct platform_device *pdev)
+{
+ struct mbox_controller *mbox = platform_get_drvdata(pdev);
+
+ mbox_controller_unregister(mbox);
+ return 0;
+}
+
+static const struct of_device_id arm_smc_mbox_of_match[] = {
+ { .compatible = "arm,smc-mbox", },
+ { .compatible = "arm,hvc-mbox", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, arm_smc_mbox_of_match);
+
+static struct platform_driver arm_smc_mbox_driver = {
+ .driver = {
+ .name = "arm-smc-mbox",
+ .of_match_table = arm_smc_mbox_of_match,
+ },
+ .probe = arm_smc_mbox_probe,
+ .remove = arm_smc_mbox_remove,
+};
+module_platform_driver(arm_smc_mbox_driver);
+
+MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
+MODULE_DESCRIPTION("Generic ARM smc mailbox driver");
+MODULE_LICENSE("GPL v2");
new file mode 100644
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _LINUX_ARM_SMCCC_MBOX_H_
+#define _LINUX_ARM_SMCCC_MBOX_H_
+
+/**
+ * struct arm_smccc_mbox_cmd - ARM SMCCC message structure
+ * @function_id: function id passed from client, If mbox
+ * DT has arm,func-id property, the driver will use
+ * that one.
+ * @args_smccc32/64: actual usage of registers is up to the protocol
+ * (within the SMCCC limits)
+ */
+struct arm_smccc_mbox_cmd {
+ unsigned int function_id;
+ union {
+ u32 args_smccc32[6];
+ u64 args_smccc64[6];
+ };
+};
+
+#endif /* _LINUX_ARM_SMCCC_MBOX_H_ */