minix/kernel/arch/earm/bsp/ti/omap_reset.c

   1 #include <assert.h>
   2 #include <sys/types.h>
   3 #include <machine/cpu.h>
   4 #include <minix/type.h>
   5 #include <minix/board.h>
   6 #include <io.h>
   7
   8 #include "kernel/kernel.h"
   9 #include "kernel/proc.h"
  10 #include "kernel/vm.h"
  11 #include "kernel/proto.h"
  12 #include "arch_proto.h"
  13 #include "bsp_reset.h"
  14
  15 #include "omap_timer_registers.h"
  16 #include "omap_rtc.h"
  17
  18 #define AM335X_CM_BASE 0x44E00000
  19 #define AM335X_CM_SIZE 0x1000
  20
  21 #define AM335X_PRM_DEVICE_OFFSET 0xf00
  22 #define AM335X_PRM_RSTCTRL_REG 0x00
  23 #define AM335X_RST_GLOBAL_WARM_SW_BIT 0
  24
  25 #define DM37XX_CM_BASE 0x48307000
  26 #define DM37XX_CM_SIZE 0x1000
  27 #define DM37XX_PRM_RSTCTRL_REG 0x250
  28 #define DM37XX_RST_DPLL3_BIT 2
  29
  30 struct omap_reset
  31 {
  32         vir_bytes base;
  33         vir_bytes size;
  34 };
  35
  36 static struct omap_reset omap_reset;
  37
  38 static kern_phys_map reset_phys_map;
  39
  40 void
  41 bsp_reset_init(void)
  42 {
  43         if (BOARD_IS_BBXM(machine.board_id)) {
  44                 omap_reset.base = DM37XX_CM_BASE;
  45                 omap_reset.size = DM37XX_CM_SIZE;
  46         } else if (BOARD_IS_BB(machine.board_id)) {
  47                 omap_reset.base = AM335X_CM_BASE;
  48                 omap_reset.size = AM335X_CM_SIZE;
  49         }
  50
  51         kern_phys_map_ptr(omap_reset.base, omap_reset.size,
  52             VMMF_UNCACHED | VMMF_WRITE,
  53             &reset_phys_map, (vir_bytes) & omap_reset.base);
  54 }
  55
  56 void
  57 bsp_reset(void)
  58 {
  59         if (BOARD_IS_BBXM(machine.board_id)) {
  60                 mmio_set((omap_reset.base + DM37XX_PRM_RSTCTRL_REG),
  61                     (1 << DM37XX_RST_DPLL3_BIT));
  62         } else if (BOARD_IS_BB(machine.board_id)) {
  63                 mmio_set((omap_reset.base + AM335X_PRM_DEVICE_OFFSET +
  64                         AM335X_PRM_RSTCTRL_REG),
  65                     (1 << AM335X_RST_GLOBAL_WARM_SW_BIT));
  66         }
  67 }
  68
  69 void
  70 bsp_poweroff(void)
  71 {
  72
  73 /*
  74  * The am335x can signal an external power management chip to cut the power
  75  * by toggling the PMIC_POWER_EN pin. It might fail if there isn't an
  76  * external PMIC or if the PMIC hasn't been configured to respond to toggles.
  77  * The only way to pull the pin low is via ALARM2 (see TRM 20.3.3.8).
  78  * At this point PM should have already signaled readclock to set the alarm.
  79  */
  80         if (BOARD_IS_BB(machine.board_id)) {
  81                 /* rtc was frozen to prevent premature power-off, unfreeze it
  82                  * now */
  83                 omap3_rtc_run();
  84
  85                 /* wait for the alarm to go off and PMIC to disable power to
  86                  * SoC */
  87                 while (1);
  88         }
  89 }
  90
  91 void bsp_disable_watchdog(void)
  92 {
  93         if(BOARD_IS_BB(machine.board_id)) {
  94                 mmio_write(AM335X_WDT_BASE+AM335X_WDT_WSPR, 0xAAAA);
  95                 while(mmio_read(AM335X_WDT_BASE+AM335X_WDT_WWPS) != 0) ;
  96                 mmio_write(AM335X_WDT_BASE+AM335X_WDT_WSPR, 0x5555);
  97                 while(mmio_read(AM335X_WDT_BASE+AM335X_WDT_WWPS) != 0) ;
  98         }
  99 }
 100