arch/arm/mach-omap2/ti81xx-restart.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License version 2 as
   4  * published by the Free Software Foundation.
   5  */
   6 #include <linux/kernel.h>
   7 #include <linux/init.h>
   8 #include <linux/reboot.h>
   9
  10 #include "iomap.h"
  11 #include "common.h"
  12 #include "control.h"
  13 #include "prm3xxx.h"
  14
  15 #define TI81XX_PRM_DEVICE_RSTCTRL       0x00a0
  16 #define TI81XX_GLOBAL_RST_COLD          BIT(1)
  17
  18 /**
  19  * ti81xx_restart - trigger a software restart of the SoC
  20  * @mode: the "reboot mode", see arch/arm/kernel/{setup,process}.c
  21  * @cmd: passed from the userspace program rebooting the system (if provided)
  22  *
  23  * Resets the SoC.  For @cmd, see the 'reboot' syscall in
  24  * kernel/sys.c.  No return value.
  25  *
  26  * NOTE: Warm reset does not seem to work, may require resetting
  27  * clocks to bypass mode.
  28  */
  29 void ti81xx_restart(enum reboot_mode mode, const char *cmd)
  30 {
  31         omap2_prm_set_mod_reg_bits(TI81XX_GLOBAL_RST_COLD, 0,
  32                                    TI81XX_PRM_DEVICE_RSTCTRL);
  33         while (1);
  34 }