arch/arm/mach-omap2/omap-secure.c

   1 /*
   2  * OMAP Secure API infrastructure.
   3  *
   4  * Copyright (C) 2011 Texas Instruments, Inc.
   5  *      Santosh Shilimkar <santosh.shilimkar@ti.com>
   6  *
   7  *
   8  * This program is free software,you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/io.h>
  16 #include <linux/memblock.h>
  17
  18 #include <asm/cacheflush.h>
  19 #include <asm/memblock.h>
  20
  21 #include "omap-secure.h"
  22
  23 static phys_addr_t omap_secure_memblock_base;
  24
  25 /**
  26  * omap_sec_dispatcher: Routine to dispatch low power secure
  27  * service routines
  28  * @idx: The HAL API index
  29  * @flag: The flag indicating criticality of operation
  30  * @nargs: Number of valid arguments out of four.
  31  * @arg1, arg2, arg3 args4: Parameters passed to secure API
  32  *
  33  * Return the non-zero error value on failure.
  34  */
  35 u32 omap_secure_dispatcher(u32 idx, u32 flag, u32 nargs, u32 arg1, u32 arg2,
  36                                                          u32 arg3, u32 arg4)
  37 {
  38         u32 ret;
  39         u32 param[5];
  40
  41         param[0] = nargs;
  42         param[1] = arg1;
  43         param[2] = arg2;
  44         param[3] = arg3;
  45         param[4] = arg4;
  46
  47         /*
  48          * Secure API needs physical address
  49          * pointer for the parameters
  50          */
  51         flush_cache_all();
  52         outer_clean_range(__pa(param), __pa(param + 5));
  53         ret = omap_smc2(idx, flag, __pa(param));
  54
  55         return ret;
  56 }
  57
  58 /* Allocate the memory to save secure ram */
  59 int __init omap_secure_ram_reserve_memblock(void)
  60 {
  61         u32 size = OMAP_SECURE_RAM_STORAGE;
  62
  63         size = ALIGN(size, SECTION_SIZE);
  64         omap_secure_memblock_base = arm_memblock_steal(size, SECTION_SIZE);
  65
  66         return 0;
  67 }
  68
  69 phys_addr_t omap_secure_ram_mempool_base(void)
  70 {
  71         return omap_secure_memblock_base;
  72 }