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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <linux/kernel.h>
   3 #include <linux/init.h>
   4 #include <linux/reboot.h>
   5
   6 #include "iomap.h"
   7 #include "common.h"
   8 #include "control.h"
   9 #include "prm3xxx.h"
  10
  11 #define TI81XX_PRM_DEVICE_RSTCTRL       0x00a0
  12 #define TI81XX_GLOBAL_RST_COLD          BIT(1)
  13
  14 /**
  15  * ti81xx_restart - trigger a software restart of the SoC
  16  * @mode: the "reboot mode", see arch/arm/kernel/{setup,process}.c
  17  * @cmd: passed from the userspace program rebooting the system (if provided)
  18  *
  19  * Resets the SoC.  For @cmd, see the 'reboot' syscall in
  20  * kernel/sys.c.  No return value.
  21  *
  22  * NOTE: Warm reset does not seem to work, may require resetting
  23  * clocks to bypass mode.
  24  */
  25 void ti81xx_restart(enum reboot_mode mode, const char *cmd)
  26 {
  27         omap2_prm_set_mod_reg_bits(TI81XX_GLOBAL_RST_COLD, 0,
  28                                    TI81XX_PRM_DEVICE_RSTCTRL);
  29         while (1);
  30 }