arch/arm/mach-bcmring/csp/chipc/chipcHw_reset.c

   1 /*****************************************************************************
   2 * Copyright 2003 - 2008 Broadcom Corporation.  All rights reserved.
   3 *
   4 * Unless you and Broadcom execute a separate written software license
   5 * agreement governing use of this software, this software is licensed to you
   6 * under the terms of the GNU General Public License version 2, available at
   7 * http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
   8 *
   9 * Notwithstanding the above, under no circumstances may you combine this
  10 * software in any way with any other Broadcom software provided under a
  11 * license other than the GPL, without Broadcom's express prior written
  12 * consent.
  13 *****************************************************************************/
  14
  15 /* ---- Include Files ---------------------------------------------------- */
  16 #include <csp/stdint.h>
  17 #include <mach/csp/chipcHw_def.h>
  18 #include <mach/csp/chipcHw_inline.h>
  19 #include <csp/intcHw.h>
  20 #include <csp/cache.h>
  21
  22 /* ---- Private Constants and Types --------------------------------------- */
  23 /* ---- Private Variables ------------------------------------------------- */
  24 void chipcHw_reset_run_from_aram(void);
  25
  26 typedef void (*RUNFUNC) (void);
  27
  28 /****************************************************************************/
  29 /**
  30 *  @brief   warmReset
  31 *
  32 *  @note warmReset configures the clocks which are not reset back to the state
  33 *   required to execute on reset.  To do so we need to copy the code into internal
  34 *   memory to change the ARM clock while we are not executing from DDR.
  35 */
  36 /****************************************************************************/
  37 void chipcHw_reset(uint32_t mask)
  38 {
  39         int i = 0;
  40         RUNFUNC runFunc = (RUNFUNC) (unsigned long)MM_ADDR_IO_ARAM;
  41
  42         /* Disable all interrupts */
  43         intcHw_irq_disable(INTCHW_INTC0, 0xffffffff);
  44         intcHw_irq_disable(INTCHW_INTC1, 0xffffffff);
  45         intcHw_irq_disable(INTCHW_SINTC, 0xffffffff);
  46
  47         {
  48                 REG_LOCAL_IRQ_SAVE;
  49                 if (mask & chipcHw_REG_SOFT_RESET_CHIP_SOFT) {
  50                         chipcHw_softReset(chipcHw_REG_SOFT_RESET_CHIP_SOFT);
  51                 }
  52                 /* Bypass the PLL clocks before reboot */
  53                 pChipcHw->UARTClock |= chipcHw_REG_PLL_CLOCK_BYPASS_SELECT;
  54                 pChipcHw->SPIClock |= chipcHw_REG_PLL_CLOCK_BYPASS_SELECT;
  55
  56                 /* Copy the chipcHw_warmReset_run_from_aram function into ARAM */
  57                 do {
  58                         ((uint32_t *) MM_IO_BASE_ARAM)[i] =
  59                             ((uint32_t *) &chipcHw_reset_run_from_aram)[i];
  60                         i++;
  61                 } while (((uint32_t *) MM_IO_BASE_ARAM)[i - 1] != 0xe1a0f00f);  /* 0xe1a0f00f == asm ("mov r15, r15"); */
  62
  63                 CSP_CACHE_FLUSH_ALL;
  64
  65                 /* run the function from ARAM */
  66                 runFunc();
  67
  68                 /* Code will never get here, but include it to balance REG_LOCAL_IRQ_SAVE above */
  69                 REG_LOCAL_IRQ_RESTORE;
  70         }
  71 }
  72
  73 /* This function must run from internal memory */
  74 void chipcHw_reset_run_from_aram(void)
  75 {
  76 /* Make sure, pipeline is filled with instructions coming from ARAM */
  77 __asm (" nop                                                            \n\t"
  78                 " nop                                                            \n\t"
  79 #if defined(__KERNEL__) && !defined(STANDALONE)
  80                 " MRC      p15,#0x0,r0,c1,c0,#0                                  \n\t"
  81                 " BIC      r0,r0,#0xd                                            \n\t"
  82                 " MCR      p15,#0x0,r0,c1,c0,#0                                  \n\t"
  83                 " nop                                                            \n\t"
  84                 " nop                                                            \n\t"
  85                 " nop                                                            \n\t"
  86                 " nop                                                            \n\t"
  87                 " nop                                                            \n\t"
  88                 " nop                                                            \n\t"
  89 #endif
  90                 " nop                                                            \n\t"
  91                 " nop                                                            \n\t"
  92 /* Bypass the ARM clock and switch to XTAL clock */
  93                 " MOV      r2,#0x80000000                                        \n\t"
  94                 " LDR      r3,[r2,#8]                                            \n\t"
  95                 " ORR      r3,r3,#0x20000                                        \n\t"
  96                 " STR      r3,[r2,#8]                                            \n\t"
  97
  98                 " nop                                                            \n\t"
  99                 " nop                                                            \n\t"
 100                 " nop                                                            \n\t"
 101                 " nop                                                            \n\t"
 102                 " nop                                                            \n\t"
 103                 " nop                                                            \n\t"
 104                 " nop                                                            \n\t"
 105                 " nop                                                            \n\t"
 106                 " nop                                                            \n\t"
 107                 " nop                                                            \n\t"
 108                 " nop                                                            \n\t"
 109                 " nop                                                            \n\t"
 110                 " nop                                                            \n\t"
 111                 " nop                                                            \n\t"
 112                 " nop                                                            \n\t"
 113                 " nop                                                            \n\t"
 114                 " nop                                                            \n\t"
 115                 " nop                                                            \n\t"
 116                 " nop                                                            \n\t"
 117                 " nop                                                            \n\t"
 118 /* Issue reset */
 119                 " MOV      r3,#0x2                                               \n\t"
 120                 " STR      r3,[r2,#0x80]                                         \n\t"
 121 /* End here */
 122                 " MOV      pc,pc                                                 \n\t");
 123 /* 0xe1a0f00f ==  asm ("mov r15, r15"); */
 124 }