projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| b8a16e1f BS |
1 | /* arch/arm/mach-msm/proc_comm.c |
| 2 | * | |
| 3 | * Copyright (C) 2007-2008 Google, Inc. | |
| 4 | * Author: Brian Swetland <swetland@google.com> | |
| 5 | * | |
| 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. | |
| 9 | * | |
| 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. | |
| 14 | * | |
| 15 | */ | |
| 16 | ||
| 17 | #include <linux/delay.h> | |
| 18 | #include <linux/errno.h> | |
| 19 | #include <linux/io.h> | |
| 20 | #include <linux/spinlock.h> | |
| 21 | #include <mach/msm_iomap.h> | |
| 22 | #include <mach/system.h> | |
| 23 | ||
| 24 | #include "proc_comm.h" | |
| 25 | ||
| 26 | #define MSM_A2M_INT(n) (MSM_CSR_BASE + 0x400 + (n) * 4) | |
| 27 | ||
| 28 | static inline void notify_other_proc_comm(void) | |
| 29 | { | |
| 30 | writel(1, MSM_A2M_INT(6)); | |
| 31 | } | |
| 32 | ||
| 33 | #define APP_COMMAND 0x00 | |
| 34 | #define APP_STATUS 0x04 | |
| 35 | #define APP_DATA1 0x08 | |
| 36 | #define APP_DATA2 0x0C | |
| 37 | ||
| 38 | #define MDM_COMMAND 0x10 | |
| 39 | #define MDM_STATUS 0x14 | |
| 40 | #define MDM_DATA1 0x18 | |
| 41 | #define MDM_DATA2 0x1C | |
| 42 | ||
| 43 | static DEFINE_SPINLOCK(proc_comm_lock); | |
| 44 | ||
| 45 | /* The higher level SMD support will install this to | |
| 46 | * provide a way to check for and handle modem restart. | |
| 47 | */ | |
| 48 | int (*msm_check_for_modem_crash)(void); | |
| 49 | ||
| 50 | /* Poll for a state change, checking for possible | |
| 51 | * modem crashes along the way (so we don't wait | |
| 52 | * forever while the ARM9 is blowing up). | |
| 53 | * | |
| 54 | * Return an error in the event of a modem crash and | |
| 55 | * restart so the msm_proc_comm() routine can restart | |
| 56 | * the operation from the beginning. | |
| 57 | */ | |
| 58 | static int proc_comm_wait_for(void __iomem *addr, unsigned value) | |
| 59 | { | |
| 60 | for (;;) { | |
| 61 | if (readl(addr) == value) | |
| 62 | return 0; | |
| 63 | ||
| 64 | if (msm_check_for_modem_crash) | |
| 65 | if (msm_check_for_modem_crash()) | |
| 66 | return -EAGAIN; | |
| 67 | } | |
| 68 | } | |
| 69 | ||
| 70 | int msm_proc_comm(unsigned cmd, unsigned *data1, unsigned *data2) | |
| 71 | { | |
| 72 | void __iomem *base = MSM_SHARED_RAM_BASE; | |
| 73 | unsigned long flags; | |
| 74 | int ret; | |
| 75 | ||
| 76 | spin_lock_irqsave(&proc_comm_lock, flags); | |
| 77 | ||
| 78 | for (;;) { | |
| 79 | if (proc_comm_wait_for(base + MDM_STATUS, PCOM_READY)) | |
| 80 | continue; | |
| 81 | ||
| 82 | writel(cmd, base + APP_COMMAND); | |
| 83 | writel(data1 ? *data1 : 0, base + APP_DATA1); | |
| 84 | writel(data2 ? *data2 : 0, base + APP_DATA2); | |
| 85 | ||
| 86 | notify_other_proc_comm(); | |
| 87 | ||
| 88 | if (proc_comm_wait_for(base + APP_COMMAND, PCOM_CMD_DONE)) | |
| 89 | continue; | |
| 90 | ||
| 91 | if (readl(base + APP_STATUS) != PCOM_CMD_FAIL) { | |
| 92 | if (data1) | |
| 93 | *data1 = readl(base + APP_DATA1); | |
| 94 | if (data2) | |
| 95 | *data2 = readl(base + APP_DATA2); | |
| 96 | ret = 0; | |
| 97 | } else { | |
| 98 | ret = -EIO; | |
| 99 | } | |
| 100 | break; | |
| 101 | } | |
| 102 | ||
| 103 | writel(PCOM_CMD_IDLE, base + APP_COMMAND); | |
| 104 | ||
| 105 | spin_unlock_irqrestore(&proc_comm_lock, flags); | |
| 106 | ||
| 107 | return ret; | |
| 108 | } | |
| 109 | ||
| 110 |