1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/* arch/arm/mach-msm/proc_comm.c
*
* Copyright (C) 2007-2008 Google, Inc.
* Copyright (c) 2009-2012, The Linux Foundation. All rights reserved.
* Author: Brian Swetland <swetland@google.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <mach/msm_iomap.h>
#include <mach/system.h>
#include <mach/proc_comm.h>
#include "smd_private.h"
static inline void notify_other_proc_comm(void)
{
/* Make sure the write completes before interrupt */
wmb();
#if defined(CONFIG_ARCH_MSM7X30)
__raw_writel(1 << 6, MSM_APCS_GCC_BASE + 0x8);
#elif defined(CONFIG_ARCH_MSM8X60)
__raw_writel(1 << 5, MSM_GCC_BASE + 0x8);
#else
__raw_writel(1, MSM_CSR_BASE + 0x400 + (6) * 4);
#endif
}
#define APP_COMMAND 0x00
#define APP_STATUS 0x04
#define APP_DATA1 0x08
#define APP_DATA2 0x0C
#define MDM_COMMAND 0x10
#define MDM_STATUS 0x14
#define MDM_DATA1 0x18
#define MDM_DATA2 0x1C
static DEFINE_SPINLOCK(proc_comm_lock);
static int msm_proc_comm_disable;
/* Poll for a state change, checking for possible
* modem crashes along the way (so we don't wait
* forever while the ARM9 is blowing up.
*
* Return an error in the event of a modem crash and
* restart so the msm_proc_comm() routine can restart
* the operation from the beginning.
*/
static int proc_comm_wait_for(unsigned addr, unsigned value)
{
while (1) {
/* Barrier here prevents excessive spinning */
mb();
if (readl_relaxed(addr) == value)
return 0;
if (smsm_check_for_modem_crash())
return -EAGAIN;
udelay(5);
}
}
void msm_proc_comm_reset_modem_now(void)
{
unsigned base = (unsigned)MSM_SHARED_RAM_BASE;
unsigned long flags;
spin_lock_irqsave(&proc_comm_lock, flags);
again:
if (proc_comm_wait_for(base + MDM_STATUS, PCOM_READY))
goto again;
writel_relaxed(PCOM_RESET_MODEM, base + APP_COMMAND);
writel_relaxed(0, base + APP_DATA1);
writel_relaxed(0, base + APP_DATA2);
spin_unlock_irqrestore(&proc_comm_lock, flags);
/* Make sure the writes complete before notifying the other side */
wmb();
notify_other_proc_comm();
return;
}
EXPORT_SYMBOL(msm_proc_comm_reset_modem_now);
int msm_proc_comm(unsigned cmd, unsigned *data1, unsigned *data2)
{
unsigned base = (unsigned)MSM_SHARED_RAM_BASE;
unsigned long flags;
int ret;
spin_lock_irqsave(&proc_comm_lock, flags);
if (msm_proc_comm_disable) {
ret = -EIO;
goto end;
}
again:
if (proc_comm_wait_for(base + MDM_STATUS, PCOM_READY))
goto again;
writel_relaxed(cmd, base + APP_COMMAND);
writel_relaxed(data1 ? *data1 : 0, base + APP_DATA1);
writel_relaxed(data2 ? *data2 : 0, base + APP_DATA2);
/* Make sure the writes complete before notifying the other side */
wmb();
notify_other_proc_comm();
if (proc_comm_wait_for(base + APP_COMMAND, PCOM_CMD_DONE))
goto again;
if (readl_relaxed(base + APP_STATUS) == PCOM_CMD_SUCCESS) {
if (data1)
*data1 = readl_relaxed(base + APP_DATA1);
if (data2)
*data2 = readl_relaxed(base + APP_DATA2);
ret = 0;
} else {
ret = -EIO;
}
writel_relaxed(PCOM_CMD_IDLE, base + APP_COMMAND);
switch (cmd) {
case PCOM_RESET_CHIP:
case PCOM_RESET_CHIP_IMM:
case PCOM_RESET_APPS:
msm_proc_comm_disable = 1;
printk(KERN_ERR "msm: proc_comm: proc comm disabled\n");
break;
}
end:
/* Make sure the writes complete before returning */
wmb();
spin_unlock_irqrestore(&proc_comm_lock, flags);
return ret;
}
EXPORT_SYMBOL(msm_proc_comm);
|
