131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/* arch/arm/mach-msm/proc_comm.c
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*
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* Copyright (C) 2007-2008 Google, Inc.
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* Author: Brian Swetland <swetland@google.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <mach/msm_iomap.h>
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#include <mach/system.h>
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#include "proc_comm.h"
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static inline void msm_a2m_int(uint32_t irq)
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{
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#if defined(CONFIG_ARCH_MSM7X30)
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writel(1 << irq, MSM_GCC_BASE + 0x8);
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#else
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writel(1, MSM_CSR_BASE + 0x400 + (irq * 4));
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#endif
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}
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static inline void notify_other_proc_comm(void)
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{
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msm_a2m_int(6);
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}
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#define APP_COMMAND 0x00
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#define APP_STATUS 0x04
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#define APP_DATA1 0x08
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#define APP_DATA2 0x0C
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#define MDM_COMMAND 0x10
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#define MDM_STATUS 0x14
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#define MDM_DATA1 0x18
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#define MDM_DATA2 0x1C
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static DEFINE_SPINLOCK(proc_comm_lock);
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/* The higher level SMD support will install this to
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* provide a way to check for and handle modem restart.
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*/
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int (*msm_check_for_modem_crash)(void);
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/* Poll for a state change, checking for possible
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* modem crashes along the way (so we don't wait
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* forever while the ARM9 is blowing up).
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*
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* Return an error in the event of a modem crash and
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* restart so the msm_proc_comm() routine can restart
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* the operation from the beginning.
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*/
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static int proc_comm_wait_for(void __iomem *addr, unsigned value)
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{
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for (;;) {
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if (readl(addr) == value)
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return 0;
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if (msm_check_for_modem_crash)
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if (msm_check_for_modem_crash())
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return -EAGAIN;
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}
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}
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int msm_proc_comm(unsigned cmd, unsigned *data1, unsigned *data2)
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{
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void __iomem *base = MSM_SHARED_RAM_BASE;
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&proc_comm_lock, flags);
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for (;;) {
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if (proc_comm_wait_for(base + MDM_STATUS, PCOM_READY))
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continue;
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writel(cmd, base + APP_COMMAND);
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writel(data1 ? *data1 : 0, base + APP_DATA1);
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writel(data2 ? *data2 : 0, base + APP_DATA2);
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notify_other_proc_comm();
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if (proc_comm_wait_for(base + APP_COMMAND, PCOM_CMD_DONE))
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continue;
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if (readl(base + APP_STATUS) != PCOM_CMD_FAIL) {
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if (data1)
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*data1 = readl(base + APP_DATA1);
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if (data2)
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*data2 = readl(base + APP_DATA2);
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ret = 0;
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} else {
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ret = -EIO;
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}
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break;
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}
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writel(PCOM_CMD_IDLE, base + APP_COMMAND);
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spin_unlock_irqrestore(&proc_comm_lock, flags);
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return ret;
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}
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/*
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* We need to wait for the ARM9 to at least partially boot
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* up before we can continue. Since the ARM9 does resource
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* allocation, if we dont' wait we could end up crashing or in
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* and unknown state. This function should be called early to
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* wait on the ARM9.
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*/
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void __devinit proc_comm_boot_wait(void)
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{
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void __iomem *base = MSM_SHARED_RAM_BASE;
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proc_comm_wait_for(base + MDM_STATUS, PCOM_READY);
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}
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