131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/* arch/arm/mach-msm/proc_comm.c
|
|
*
|
|
* Copyright (C) 2007-2008 Google, Inc.
|
|
* 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 <mach/msm_iomap.h>
|
|
#include <mach/system.h>
|
|
|
|
#include "proc_comm.h"
|
|
|
|
static inline void msm_a2m_int(uint32_t irq)
|
|
{
|
|
#if defined(CONFIG_ARCH_MSM7X30)
|
|
writel(1 << irq, MSM_GCC_BASE + 0x8);
|
|
#else
|
|
writel(1, MSM_CSR_BASE + 0x400 + (irq * 4));
|
|
#endif
|
|
}
|
|
|
|
static inline void notify_other_proc_comm(void)
|
|
{
|
|
msm_a2m_int(6);
|
|
}
|
|
|
|
#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);
|
|
|
|
/* The higher level SMD support will install this to
|
|
* provide a way to check for and handle modem restart.
|
|
*/
|
|
int (*msm_check_for_modem_crash)(void);
|
|
|
|
/* 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(void __iomem *addr, unsigned value)
|
|
{
|
|
for (;;) {
|
|
if (readl(addr) == value)
|
|
return 0;
|
|
|
|
if (msm_check_for_modem_crash)
|
|
if (msm_check_for_modem_crash())
|
|
return -EAGAIN;
|
|
}
|
|
}
|
|
|
|
int msm_proc_comm(unsigned cmd, unsigned *data1, unsigned *data2)
|
|
{
|
|
void __iomem *base = MSM_SHARED_RAM_BASE;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&proc_comm_lock, flags);
|
|
|
|
for (;;) {
|
|
if (proc_comm_wait_for(base + MDM_STATUS, PCOM_READY))
|
|
continue;
|
|
|
|
writel(cmd, base + APP_COMMAND);
|
|
writel(data1 ? *data1 : 0, base + APP_DATA1);
|
|
writel(data2 ? *data2 : 0, base + APP_DATA2);
|
|
|
|
notify_other_proc_comm();
|
|
|
|
if (proc_comm_wait_for(base + APP_COMMAND, PCOM_CMD_DONE))
|
|
continue;
|
|
|
|
if (readl(base + APP_STATUS) != PCOM_CMD_FAIL) {
|
|
if (data1)
|
|
*data1 = readl(base + APP_DATA1);
|
|
if (data2)
|
|
*data2 = readl(base + APP_DATA2);
|
|
ret = 0;
|
|
} else {
|
|
ret = -EIO;
|
|
}
|
|
break;
|
|
}
|
|
|
|
writel(PCOM_CMD_IDLE, base + APP_COMMAND);
|
|
|
|
spin_unlock_irqrestore(&proc_comm_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* We need to wait for the ARM9 to at least partially boot
|
|
* up before we can continue. Since the ARM9 does resource
|
|
* allocation, if we dont' wait we could end up crashing or in
|
|
* and unknown state. This function should be called early to
|
|
* wait on the ARM9.
|
|
*/
|
|
void __init proc_comm_boot_wait(void)
|
|
{
|
|
void __iomem *base = MSM_SHARED_RAM_BASE;
|
|
|
|
proc_comm_wait_for(base + MDM_STATUS, PCOM_READY);
|
|
|
|
}
|