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| author | Arun P. Mohanan <arun.p.m@linux.intel.com> | 2021-03-18 13:18:09 +0300 |
|---|---|---|
| committer | Jae Hyun Yoo <jae.hyun.yoo@intel.com> | 2021-07-14 20:10:33 +0300 |
| commit | e296d7049f4e899db4fb4918c8f4c4831bed3b1d (patch) | |
| tree | fdcc005f86d9897e14c3f46eaae0a74bcb61a407 | |
| parent | b421703ceafe83f6d9ab74bcddefc3aad3f18124 (diff) | |
| download | linux-e296d7049f4e899db4fb4918c8f4c4831bed3b1d.tar.xz | |
mailbox: ioctl to fetch mailbox size
The size of mailbox differ from AST2500, AST2600 A0 and A1. Add an ioctl
support to fetch the mailbox size.
Tested:
Verfied ioctl call returns mailbox size as expected.
Change-Id: I4e261aaf8aa3fb108d6ad152d30a17b114d70ccd
Signed-off-by: Arun P. Mohanan <arun.p.m@linux.intel.com>
| -rw-r--r-- | Documentation/userspace-api/ioctl/ioctl-number.rst | 1 | ||||
| -rw-r--r-- | drivers/soc/aspeed/aspeed-lpc-mbox.c | 20 | ||||
| -rw-r--r-- | include/uapi/linux/aspeed-lpc-mbox.h | 11 |
3 files changed, 32 insertions, 0 deletions
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst index 0f6af0bdc24b..c4a6cdf4dd06 100644 --- a/Documentation/userspace-api/ioctl/ioctl-number.rst +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst @@ -319,6 +319,7 @@ Code Seq# Include File Comments 0xA0 all linux/sdp/sdp.h Industrial Device Project <mailto:kenji@bitgate.com> 0xA1 0 linux/vtpm_proxy.h TPM Emulator Proxy Driver +0xA3 00 include/uapi/linux/aspeed-lpc-mbox.h 0xA3 80-8F Port ACL in development: <mailto:tlewis@mindspring.com> 0xA3 90-9F linux/dtlk.h diff --git a/drivers/soc/aspeed/aspeed-lpc-mbox.c b/drivers/soc/aspeed/aspeed-lpc-mbox.c index 8dd3345682c7..9f2c15b28890 100644 --- a/drivers/soc/aspeed/aspeed-lpc-mbox.c +++ b/drivers/soc/aspeed/aspeed-lpc-mbox.c @@ -2,6 +2,7 @@ // Copyright 2017 IBM Corporation // TODO: Rewrite this driver +#include <linux/aspeed-lpc-mbox.h> #include <linux/clk.h> #include <linux/interrupt.h> #include <linux/mfd/syscon.h> @@ -260,6 +261,24 @@ static int aspeed_mbox_release(struct inode *inode, struct file *file) return 0; } +static long aspeed_mbox_ioctl(struct file *file, unsigned int cmd, + unsigned long param) +{ + struct aspeed_mbox *mbox = file_mbox(file); + struct aspeed_mbox_ioctl_data data; + long ret; + + switch (cmd) { + case ASPEED_MBOX_SIZE: + data.data = mbox->configs.num_regs; + ret = copy_to_user((void __user *)param, &data, sizeof(data)); + break; + default: + ret = -ENOTTY; + } + return ret; +} + static const struct file_operations aspeed_mbox_fops = { .owner = THIS_MODULE, .llseek = no_seek_end_llseek, @@ -268,6 +287,7 @@ static const struct file_operations aspeed_mbox_fops = { .open = aspeed_mbox_open, .release = aspeed_mbox_release, .poll = aspeed_mbox_poll, + .unlocked_ioctl = aspeed_mbox_ioctl, }; static irqreturn_t aspeed_mbox_irq(int irq, void *arg) diff --git a/include/uapi/linux/aspeed-lpc-mbox.h b/include/uapi/linux/aspeed-lpc-mbox.h new file mode 100644 index 000000000000..dbb8a7f24222 --- /dev/null +++ b/include/uapi/linux/aspeed-lpc-mbox.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later WITH Linux-syscall-note */ +/* Copyright (c) 2021 Intel Corporation */ + +struct aspeed_mbox_ioctl_data { + unsigned int data; +}; + +#define ASPEED_MBOX_IOCTL_BASE 0xA3 + +#define ASPEED_MBOX_SIZE \ + _IOR(ASPEED_MBOX_IOCTL_BASE, 0, struct aspeed_mbox_ioctl_data) |