This particular Client implementation uses shared memory in order to pass messages between Mailbox users; however, it can be easily hacked to support any type of Controller. Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx> --- drivers/mailbox/Kconfig | 7 ++ drivers/mailbox/Makefile | 2 + drivers/mailbox/mailbox-test.c | 210 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 219 insertions(+) create mode 100644 drivers/mailbox/mailbox-test.c diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig index 2cc4c39..7720bde 100644 --- a/drivers/mailbox/Kconfig +++ b/drivers/mailbox/Kconfig @@ -77,4 +77,11 @@ config STI_MBOX Mailbox implementation for STMicroelectonics family chips with hardware for interprocessor communication. +config MAILBOX_TEST + tristate "Mailbox Test Client" + depends on OF + help + Test client to help with testing new Controller driver + implementations. + endif diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile index 7cb4766..92435ef 100644 --- a/drivers/mailbox/Makefile +++ b/drivers/mailbox/Makefile @@ -2,6 +2,8 @@ obj-$(CONFIG_MAILBOX) += mailbox.o +obj-$(CONFIG_MAILBOX_TEST) += mailbox-test.o + obj-$(CONFIG_ARM_MHU) += arm_mhu.o obj-$(CONFIG_PL320_MBOX) += pl320-ipc.o diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c new file mode 100644 index 0000000..10bfe3a --- /dev/null +++ b/drivers/mailbox/mailbox-test.c @@ -0,0 +1,210 @@ +/* + * Copyright (C) 2015 ST Microelectronics + * + * Author: Lee Jones <lee.jones@xxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/debugfs.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/mailbox_client.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/uaccess.h> + +#define MBOX_MAX_MSG_LEN 128 + +static struct dentry *root_debugfs_dir; + +struct mbox_test_device { + struct device *dev; + struct mbox_chan *tx_channel; + struct mbox_chan *rx_channel; + void __iomem *mmio; + +}; + +static ssize_t mbox_test_write(struct file *filp, + const char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct mbox_test_device *tdev = filp->private_data; + char *message; + int ret; + + if (count > MBOX_MAX_MSG_LEN) { + dev_err(tdev->dev, + "Message length %d greater than max allowed %d\n", + count, MBOX_MAX_MSG_LEN); + return -EINVAL; + } + + message = kzalloc(count, GFP_KERNEL); + if (!message) + return -ENOMEM; + + ret = copy_from_user(message, userbuf, count); + if (ret) + return -EFAULT; + + print_hex_dump(KERN_ERR, "Client: Sending: ", DUMP_PREFIX_ADDRESS, + 16, 1, message, 16, true); + + ret = mbox_send_message(tdev->tx_channel, message); + if (ret < 0) + dev_err(tdev->dev, "Failed to send message via mailbox\n"); + + kfree(message); + + return ret < 0 ? ret : count; +} + +static const struct file_operations mbox_test_ops = { + .write = mbox_test_write, + .open = simple_open, + .llseek = generic_file_llseek, +}; + +static int mbox_test_add_debugfs(struct platform_device *pdev, + struct mbox_test_device *tdev) +{ + if (!debugfs_initialized()) + return 0; + + root_debugfs_dir = debugfs_create_dir("mailbox", NULL); + if (!root_debugfs_dir) { + dev_err(&pdev->dev, "Failed to create Mailbox debugfs\n"); + return -EINVAL; + } + + debugfs_create_file("send-message", 0200, root_debugfs_dir, + tdev, &mbox_test_ops); + + return 0; +} + +static void mbox_test_receive_message(struct mbox_client *client, void *message) +{ + struct mbox_test_device *tdev = dev_get_drvdata(client->dev); + + if (!tdev->mmio) { + dev_info(tdev->dev, "Client: Recived something [read mmio]\n"); + return; + } + + print_hex_dump(KERN_ERR, "Client: from co-proc: ", DUMP_PREFIX_ADDRESS, + 16, 1, tdev->mmio, MBOX_MAX_MSG_LEN, true); +} + +static void mbox_test_prepare_message(struct mbox_client *client, void *message) +{ + struct mbox_test_device *tdev = dev_get_drvdata(client->dev); + + if (tdev->mmio) + memcpy(tdev->mmio, message, MBOX_MAX_MSG_LEN); +} + +static void mbox_test_message_sent(struct mbox_client *client, + void *message, int r) +{ + if (r) + dev_warn(client->dev, + "Client: Message could not be sent: %d\n", r); + else + dev_info(client->dev, + "Client: Message sent\n"); +} + +static struct mbox_chan * +mbox_test_request_channel(struct platform_device *pdev, const char *name) +{ + struct mbox_client *client; + + client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL); + if (!client) + return ERR_PTR(-ENOMEM); + + client->dev = &pdev->dev; + client->rx_callback = mbox_test_receive_message; + client->tx_prepare = mbox_test_prepare_message; + client->tx_done = mbox_test_message_sent; + client->tx_block = true; + client->knows_txdone = false; + client->tx_tout = 500; + + return mbox_request_channel_byname(client, name); +} + +static int mbox_test_probe(struct platform_device *pdev) +{ + struct mbox_test_device *tdev; + struct resource *res; + int ret; + + tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL); + if (!tdev) + return -ENOMEM; + + /* It's okay for MMIO to be NULL */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + tdev->mmio = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(tdev->mmio)) + tdev->mmio = NULL; + + tdev->tx_channel = mbox_test_request_channel(pdev, "tx"); + if (IS_ERR(tdev->tx_channel)) + return PTR_ERR(tdev->tx_channel); + + tdev->rx_channel = mbox_test_request_channel(pdev, "rx"); + if (IS_ERR(tdev->rx_channel)) + return PTR_ERR(tdev->rx_channel); + + tdev->dev = &pdev->dev; + platform_set_drvdata(pdev, tdev); + + ret = mbox_test_add_debugfs(pdev, tdev); + if (ret) + return ret; + + dev_info(&pdev->dev, "Successfully registered\n"); + + return 0; +} + +static int mbox_test_remove(struct platform_device *pdev) +{ + struct mbox_test_device *tdev = platform_get_drvdata(pdev); + + debugfs_remove_recursive(root_debugfs_dir); + + mbox_free_channel(tdev->tx_channel); + mbox_free_channel(tdev->rx_channel); + + return 0; +} + +static const struct of_device_id mbox_test_match[] = { + { .compatible = "mailbox_test" }, + {}, +}; + +static struct platform_driver mbox_test_driver = { + .driver = { + .name = "mailbox_sti_test", + .of_match_table = mbox_test_match, + }, + .probe = mbox_test_probe, + .remove = mbox_test_remove, +}; +module_platform_driver(mbox_test_driver); + +MODULE_DESCRIPTION("Generic Mailbox Testing Facility"); +MODULE_AUTHOR("Lee Jones <lee.jones@xxxxxxxxxx"); +MODULE_LICENSE("GPL v2"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html