arch/arm/mach-keystone/keystone.c

   1 /*
   2  * Keystone EVM : Board initialization
   3  *
   4  * (C) Copyright 2014
   5  *     Texas Instruments Incorporated, <www.ti.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <asm/io.h>
  12 #include <asm/arch/mon.h>
  13 #include <asm/arch/psc_defs.h>
  14 #include <asm/arch/hardware.h>
  15 #include <asm/arch/hardware.h>
  16
  17 /**
  18  * cpu_to_bus - swap bytes of the 32-bit data if the device is BE
  19  * @ptr - array of data
  20  * @length - lenght of data array
  21  */
  22 int cpu_to_bus(u32 *ptr, u32 length)
  23 {
  24         u32 i;
  25
  26         if (!(readl(KS2_DEVSTAT) & 0x1))
  27                 for (i = 0; i < length; i++, ptr++)
  28                         *ptr = cpu_to_be32(*ptr);
  29
  30         return 0;
  31 }
  32
  33 static int turn_off_myself(void)
  34 {
  35         printf("Turning off ourselves\r\n");
  36         mon_power_off(0);
  37
  38         psc_disable_module(KS2_LPSC_TETRIS);
  39         psc_disable_domain(KS2_TETRIS_PWR_DOMAIN);
  40
  41         asm volatile ("isb\n"
  42                       "dsb\n"
  43                       "wfi\n");
  44
  45         printf("What! Should not see that\n");
  46         return 0;
  47 }
  48
  49 static void turn_off_all_dsps(int num_dsps)
  50 {
  51         int i;
  52
  53         for (i = 0; i < num_dsps; i++) {
  54                 if (psc_disable_module(i + KS2_LPSC_GEM_0))
  55                         printf("Cannot disable module for #%d DSP", i);
  56
  57                 if (psc_disable_domain(i + 8))
  58                         printf("Cannot disable domain for #%d DSP", i);
  59         }
  60 }
  61
  62 int do_killme_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  63 {
  64         return turn_off_myself();
  65 }
  66
  67 U_BOOT_CMD(
  68         killme, 1,      0,      do_killme_cmd,
  69         "turn off main ARM core",
  70         "turn off main ARM core. Should not live after that :(\n"
  71 );
  72
  73 int misc_init_r(void)
  74 {
  75         char *env;
  76         long ks2_debug = 0;
  77
  78         env = getenv("ks2_debug");
  79
  80         if (env)
  81                 ks2_debug = simple_strtol(env, NULL, 0);
  82
  83         if ((ks2_debug & DBG_LEAVE_DSPS_ON) == 0)
  84                 turn_off_all_dsps(KS2_NUM_DSPS);
  85
  86         return 0;
  87 }