diff options
Diffstat (limited to 'drivers/soc/marvell/mdio_debugfs.c')
| -rw-r--r-- | drivers/soc/marvell/mdio_debugfs.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/soc/marvell/mdio_debugfs.c b/drivers/soc/marvell/mdio_debugfs.c new file mode 100644 index 000000000000..652108960499 --- /dev/null +++ b/drivers/soc/marvell/mdio_debugfs.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Marvell International Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifdef CONFIG_DEBUG_FS + +#include <linux/fs.h> +#include <linux/debugfs.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/string.h> +#include <linux/uaccess.h> +#include <linux/arm-smccc.h> + +#define OCTEONTX_MDIO_DBG_READ 0xc2000d01 +#define OCTEONTX_MDIO_DBG_WRITE 0xc2000d02 + +struct dentry *pfile; +static int parse_cmd_buffer_ctx(char *cmd_buf, size_t *count, + const char __user *buffer, + int *a, bool *write) +{ + int bytes_not_copied; + char *subtoken; + int ret, i; + + bytes_not_copied = copy_from_user(cmd_buf, buffer, *count); + if (bytes_not_copied) + return -EFAULT; + + cmd_buf[*count] = '\0'; + for (i = 0; i < 5; i++) { + subtoken = strsep(&cmd_buf, " "); + ret = subtoken ? kstrtoint(subtoken, 10, &a[i]) : -EINVAL; + if (ret < 0) + return ret; + } + if (cmd_buf) { + subtoken = strsep(&cmd_buf, " "); + ret = subtoken ? kstrtoint(subtoken, 10, &a[i]) : -EINVAL; + if (ret < 0) + return ret; + *write = true; + } + if (cmd_buf) + return -EINVAL; + return ret; +} + +static ssize_t dbg_mdio_write(struct file *filp, + const char __user *buffer, + size_t count, loff_t *ppos) +{ + struct arm_smccc_res res; + bool write = false; + char *cmd_buf; + int ret, a[6]; + + if ((*ppos != 0) || !count) + return -EINVAL; + + cmd_buf = kzalloc(count + 1, GFP_KERNEL); + if (!cmd_buf) + return count; + + ret = parse_cmd_buffer_ctx(cmd_buf, &count, buffer, a, &write); + if (ret < 0) { + pr_info("Usage: echo <cgxlmac> <mode> <addr> <devad> <reg> [value] > mdio_cmd\n"); + goto done; + } else { + if (write) + arm_smccc_smc(OCTEONTX_MDIO_DBG_WRITE, a[0], a[1], a[2], + a[3], a[4], a[5], 0, &res); + else + arm_smccc_smc(OCTEONTX_MDIO_DBG_READ, a[0], a[1], a[2], + a[3], a[4], 0, 0, &res); + pr_info("MDIO COMMAND RESULT\n"); + pr_info("===================\n"); + pr_info("res[0]:\t%ld\n", res.a0); + pr_info("res[1]:\t%ld\n", res.a1); + pr_info("res[2]:\t%ld\n", res.a2); + pr_info("res[3]:\t%ld\n", res.a3); + } +done: + kfree(cmd_buf); + return ret ? ret : count; +} + +static const struct file_operations dbg_mdio_fops = { + .owner = THIS_MODULE, + .open = simple_open, + .write = dbg_mdio_write, +}; + +static int dbg_mdio_init(void) +{ + pfile = debugfs_create_file("mdio_cmd", 0644, NULL, NULL, + &dbg_mdio_fops); + if (!pfile) + goto create_failed; + return 0; +create_failed: + pr_err("Failed to create debugfs dir/file for mdio_cmd\n"); + debugfs_remove_recursive(pfile); + return 0; +} + +static void dbg_mdio_exit(void) +{ + debugfs_remove_recursive(pfile); +} +module_init(dbg_mdio_init); +module_exit(dbg_mdio_exit); +#endif /* CONFIG_DEBUG_FS */ |