1 /* arch/arm/mach-msm/proc_comm.c
3 * Copyright (C) 2007-2008 Google, Inc.
4 * Author: Brian Swetland <swetland@google.com>
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
17 #include <linux/delay.h>
18 #include <linux/errno.h>
20 #include <linux/spinlock.h>
21 #include <mach/msm_iomap.h>
22 #include <mach/system.h>
24 #include "proc_comm.h"
26 static inline void msm_a2m_int(uint32_t irq
)
28 #if defined(CONFIG_ARCH_MSM7X30)
29 writel(1 << irq
, MSM_GCC_BASE
+ 0x8);
31 writel(1, MSM_CSR_BASE
+ 0x400 + (irq
* 4));
35 static inline void notify_other_proc_comm(void)
40 #define APP_COMMAND 0x00
41 #define APP_STATUS 0x04
42 #define APP_DATA1 0x08
43 #define APP_DATA2 0x0C
45 #define MDM_COMMAND 0x10
46 #define MDM_STATUS 0x14
47 #define MDM_DATA1 0x18
48 #define MDM_DATA2 0x1C
50 static DEFINE_SPINLOCK(proc_comm_lock
);
52 /* The higher level SMD support will install this to
53 * provide a way to check for and handle modem restart.
55 int (*msm_check_for_modem_crash
)(void);
57 /* Poll for a state change, checking for possible
58 * modem crashes along the way (so we don't wait
59 * forever while the ARM9 is blowing up).
61 * Return an error in the event of a modem crash and
62 * restart so the msm_proc_comm() routine can restart
63 * the operation from the beginning.
65 static int proc_comm_wait_for(void __iomem
*addr
, unsigned value
)
68 if (readl(addr
) == value
)
71 if (msm_check_for_modem_crash
)
72 if (msm_check_for_modem_crash())
77 int msm_proc_comm(unsigned cmd
, unsigned *data1
, unsigned *data2
)
79 void __iomem
*base
= MSM_SHARED_RAM_BASE
;
83 spin_lock_irqsave(&proc_comm_lock
, flags
);
86 if (proc_comm_wait_for(base
+ MDM_STATUS
, PCOM_READY
))
89 writel(cmd
, base
+ APP_COMMAND
);
90 writel(data1
? *data1
: 0, base
+ APP_DATA1
);
91 writel(data2
? *data2
: 0, base
+ APP_DATA2
);
93 notify_other_proc_comm();
95 if (proc_comm_wait_for(base
+ APP_COMMAND
, PCOM_CMD_DONE
))
98 if (readl(base
+ APP_STATUS
) != PCOM_CMD_FAIL
) {
100 *data1
= readl(base
+ APP_DATA1
);
102 *data2
= readl(base
+ APP_DATA2
);
110 writel(PCOM_CMD_IDLE
, base
+ APP_COMMAND
);
112 spin_unlock_irqrestore(&proc_comm_lock
, flags
);
118 * We need to wait for the ARM9 to at least partially boot
119 * up before we can continue. Since the ARM9 does resource
120 * allocation, if we dont' wait we could end up crashing or in
121 * and unknown state. This function should be called early to
124 void __devinit
proc_comm_boot_wait(void)
126 void __iomem
*base
= MSM_SHARED_RAM_BASE
;
128 proc_comm_wait_for(base
+ MDM_STATUS
, PCOM_READY
);