diff options
author | Sreedhara DS <sreedhara.ds@intel.com> | 2010-10-22 10:43:55 -0400 |
---|---|---|
committer | Matthew Garrett <mjg@redhat.com> | 2011-01-07 17:03:40 -0500 |
commit | 5369c02d951afc72d68f5f85089160a63d31ca37 (patch) | |
tree | 0a07cc414001e9dbb27e704484f75a4a6bb61f89 /drivers | |
parent | 3e5b08cbbf78bedd316904ab0cf3b27119433ee5 (diff) |
intel_scu_ipc: Utility driver for intel scu ipc
This driver implements ioctl and interfaces with intel scu ipc driver. It
is used to access pmic/msic registers from user space and firmware update
utility.
Signed-off-by: Sreedhara DS <sreedhara.ds@intel.com>
[Extensive clean up and debug]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/platform/x86/Kconfig | 9 | ||||
-rw-r--r-- | drivers/platform/x86/Makefile | 1 | ||||
-rw-r--r-- | drivers/platform/x86/intel_scu_ipc.c | 4 | ||||
-rw-r--r-- | drivers/platform/x86/intel_scu_ipcutil.c | 133 |
4 files changed, 145 insertions, 2 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index faec777b1ed..65ba62086ca 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig | |||
@@ -576,6 +576,15 @@ config INTEL_SCU_IPC | |||
576 | some embedded Intel x86 platforms. This is not needed for PC-type | 576 | some embedded Intel x86 platforms. This is not needed for PC-type |
577 | machines. | 577 | machines. |
578 | 578 | ||
579 | config INTEL_SCU_IPC_UTIL | ||
580 | tristate "Intel SCU IPC utility driver" | ||
581 | depends on INTEL_SCU_IPC | ||
582 | default y | ||
583 | ---help--- | ||
584 | The IPC Util driver provides an interface with the SCU enabling | ||
585 | low level access for debug work and updating the firmware. Say | ||
586 | N unless you will be doing this on an Intel MID platform. | ||
587 | |||
579 | config GPIO_INTEL_PMIC | 588 | config GPIO_INTEL_PMIC |
580 | bool "Intel PMIC GPIO support" | 589 | bool "Intel PMIC GPIO support" |
581 | depends on INTEL_SCU_IPC && GPIOLIB | 590 | depends on INTEL_SCU_IPC && GPIOLIB |
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 9950ccc940b..4ec4ff8f918 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile | |||
@@ -28,6 +28,7 @@ obj-$(CONFIG_TOPSTAR_LAPTOP) += topstar-laptop.o | |||
28 | obj-$(CONFIG_ACPI_TOSHIBA) += toshiba_acpi.o | 28 | obj-$(CONFIG_ACPI_TOSHIBA) += toshiba_acpi.o |
29 | obj-$(CONFIG_TOSHIBA_BT_RFKILL) += toshiba_bluetooth.o | 29 | obj-$(CONFIG_TOSHIBA_BT_RFKILL) += toshiba_bluetooth.o |
30 | obj-$(CONFIG_INTEL_SCU_IPC) += intel_scu_ipc.o | 30 | obj-$(CONFIG_INTEL_SCU_IPC) += intel_scu_ipc.o |
31 | obj-$(CONFIG_INTEL_SCU_IPC_UTIL)+= intel_scu_ipcutil.o | ||
31 | obj-$(CONFIG_RAR_REGISTER) += intel_rar_register.o | 32 | obj-$(CONFIG_RAR_REGISTER) += intel_rar_register.o |
32 | obj-$(CONFIG_INTEL_IPS) += intel_ips.o | 33 | obj-$(CONFIG_INTEL_IPS) += intel_ips.o |
33 | obj-$(CONFIG_GPIO_INTEL_PMIC) += intel_pmic_gpio.o | 34 | obj-$(CONFIG_GPIO_INTEL_PMIC) += intel_pmic_gpio.o |
diff --git a/drivers/platform/x86/intel_scu_ipc.c b/drivers/platform/x86/intel_scu_ipc.c index ca35b0ce944..1752ef006d2 100644 --- a/drivers/platform/x86/intel_scu_ipc.c +++ b/drivers/platform/x86/intel_scu_ipc.c | |||
@@ -497,7 +497,7 @@ int intel_scu_ipc_i2c_cntrl(u32 addr, u32 *data) | |||
497 | "intel_scu_ipc: I2C INVALID_CMD = 0x%x\n", cmd); | 497 | "intel_scu_ipc: I2C INVALID_CMD = 0x%x\n", cmd); |
498 | 498 | ||
499 | mutex_unlock(&ipclock); | 499 | mutex_unlock(&ipclock); |
500 | return -1; | 500 | return -EIO; |
501 | } | 501 | } |
502 | mutex_unlock(&ipclock); | 502 | mutex_unlock(&ipclock); |
503 | return 0; | 503 | return 0; |
@@ -642,7 +642,7 @@ update_end: | |||
642 | 642 | ||
643 | if (status == IPC_FW_UPDATE_SUCCESS) | 643 | if (status == IPC_FW_UPDATE_SUCCESS) |
644 | return 0; | 644 | return 0; |
645 | return -1; | 645 | return -EIO; |
646 | } | 646 | } |
647 | EXPORT_SYMBOL(intel_scu_ipc_fw_update); | 647 | EXPORT_SYMBOL(intel_scu_ipc_fw_update); |
648 | 648 | ||
diff --git a/drivers/platform/x86/intel_scu_ipcutil.c b/drivers/platform/x86/intel_scu_ipcutil.c new file mode 100644 index 00000000000..ba3231d0819 --- /dev/null +++ b/drivers/platform/x86/intel_scu_ipcutil.c | |||
@@ -0,0 +1,133 @@ | |||
1 | /* | ||
2 | * intel_scu_ipc.c: Driver for the Intel SCU IPC mechanism | ||
3 | * | ||
4 | * (C) Copyright 2008-2010 Intel Corporation | ||
5 | * Author: Sreedhara DS (sreedhara.ds@intel.com) | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or | ||
8 | * modify it under the terms of the GNU General Public License | ||
9 | * as published by the Free Software Foundation; version 2 | ||
10 | * of the License. | ||
11 | * | ||
12 | * This driver provides ioctl interfaces to call intel scu ipc driver api | ||
13 | */ | ||
14 | |||
15 | #include <linux/module.h> | ||
16 | #include <linux/kernel.h> | ||
17 | #include <linux/errno.h> | ||
18 | #include <linux/types.h> | ||
19 | #include <linux/fs.h> | ||
20 | #include <linux/fcntl.h> | ||
21 | #include <linux/sched.h> | ||
22 | #include <linux/uaccess.h> | ||
23 | #include <linux/slab.h> | ||
24 | #include <linux/init.h> | ||
25 | #include <asm/intel_scu_ipc.h> | ||
26 | |||
27 | static u32 major; | ||
28 | |||
29 | #define MAX_FW_SIZE 264192 | ||
30 | |||
31 | /* ioctl commnds */ | ||
32 | #define INTE_SCU_IPC_REGISTER_READ 0 | ||
33 | #define INTE_SCU_IPC_REGISTER_WRITE 1 | ||
34 | #define INTE_SCU_IPC_REGISTER_UPDATE 2 | ||
35 | #define INTE_SCU_IPC_FW_UPDATE 0xA2 | ||
36 | |||
37 | struct scu_ipc_data { | ||
38 | u32 count; /* No. of registers */ | ||
39 | u16 addr[5]; /* Register addresses */ | ||
40 | u8 data[5]; /* Register data */ | ||
41 | u8 mask; /* Valid for read-modify-write */ | ||
42 | }; | ||
43 | |||
44 | /** | ||
45 | * scu_reg_access - implement register access ioctls | ||
46 | * @cmd: command we are doing (read/write/update) | ||
47 | * @data: kernel copy of ioctl data | ||
48 | * | ||
49 | * Allow the user to perform register accesses on the SCU via the | ||
50 | * kernel interface | ||
51 | */ | ||
52 | |||
53 | static int scu_reg_access(u32 cmd, struct scu_ipc_data *data) | ||
54 | { | ||
55 | int count = data->count; | ||
56 | |||
57 | if (count == 0 || count == 3 || count > 4) | ||
58 | return -EINVAL; | ||
59 | |||
60 | switch (cmd) { | ||
61 | case INTE_SCU_IPC_REGISTER_READ: | ||
62 | return intel_scu_ipc_readv(data->addr, data->data, count); | ||
63 | case INTE_SCU_IPC_REGISTER_WRITE: | ||
64 | return intel_scu_ipc_writev(data->addr, data->data, count); | ||
65 | case INTE_SCU_IPC_REGISTER_UPDATE: | ||
66 | return intel_scu_ipc_update_register(data->addr[0], | ||
67 | data->data[0], data->mask); | ||
68 | default: | ||
69 | return -ENOTTY; | ||
70 | } | ||
71 | } | ||
72 | |||
73 | /** | ||
74 | * scu_ipc_ioctl - control ioctls for the SCU | ||
75 | * @fp: file handle of the SCU device | ||
76 | * @cmd: ioctl coce | ||
77 | * @arg: pointer to user passed structure | ||
78 | * | ||
79 | * Support the I/O and firmware flashing interfaces of the SCU | ||
80 | */ | ||
81 | static long scu_ipc_ioctl(struct file *fp, unsigned int cmd, | ||
82 | unsigned long arg) | ||
83 | { | ||
84 | int ret; | ||
85 | struct scu_ipc_data data; | ||
86 | void __user *argp = (void __user *)arg; | ||
87 | |||
88 | if (!capable(CAP_SYS_RAWIO)) | ||
89 | return -EPERM; | ||
90 | |||
91 | if (cmd == INTE_SCU_IPC_FW_UPDATE) { | ||
92 | u8 *fwbuf = kmalloc(MAX_FW_SIZE, GFP_KERNEL); | ||
93 | if (fwbuf == NULL) | ||
94 | return -ENOMEM; | ||
95 | if (copy_from_user(fwbuf, (u8 *)arg, MAX_FW_SIZE)) { | ||
96 | kfree(fwbuf); | ||
97 | return -EFAULT; | ||
98 | } | ||
99 | ret = intel_scu_ipc_fw_update(fwbuf, MAX_FW_SIZE); | ||
100 | kfree(fwbuf); | ||
101 | return ret; | ||
102 | } else { | ||
103 | if (copy_from_user(&data, argp, sizeof(struct scu_ipc_data))) | ||
104 | return -EFAULT; | ||
105 | ret = scu_reg_access(cmd, &data); | ||
106 | if (ret < 0) | ||
107 | return ret; | ||
108 | if (copy_to_user(argp, &data, sizeof(struct scu_ipc_data))) | ||
109 | return -EFAULT; | ||
110 | return 0; | ||
111 | } | ||
112 | } | ||
113 | |||
114 | static const struct file_operations scu_ipc_fops = { | ||
115 | .unlocked_ioctl = scu_ipc_ioctl, | ||
116 | }; | ||
117 | |||
118 | static int __init ipc_module_init(void) | ||
119 | { | ||
120 | return register_chrdev(0, "intel_mid_scu", &scu_ipc_fops); | ||
121 | } | ||
122 | |||
123 | static void __exit ipc_module_exit(void) | ||
124 | { | ||
125 | unregister_chrdev(major, "intel_mid_scu"); | ||
126 | } | ||
127 | |||
128 | module_init(ipc_module_init); | ||
129 | module_exit(ipc_module_exit); | ||
130 | |||
131 | MODULE_LICENSE("GPL V2"); | ||
132 | MODULE_DESCRIPTION("Utility driver for intel scu ipc"); | ||
133 | MODULE_AUTHOR("Sreedhara <sreedhara.ds@intel.com>"); | ||