git.rot13.org Git - linux/blob - arch/arm/firmware/trusted_foundations.c

   1 /*
   2  * Trusted Foundations support for ARM CPUs
   3  *
   4  * Copyright (c) 2013, NVIDIA Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/of.h>
  20 #include <asm/firmware.h>
  21 #include <asm/hardware/cache-l2x0.h>
  22 #include <asm/outercache.h>
  23 #include <asm/trusted_foundations.h>
  24
  25 #define TF_CACHE_MAINT          0xfffff100
  26
  27 #define TF_CACHE_ENABLE         1
  28 #define TF_CACHE_DISABLE        2
  29
  30 #define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200
  31
  32 #define TF_CPU_PM               0xfffffffc
  33 #define TF_CPU_PM_S3            0xffffffe3
  34 #define TF_CPU_PM_S2            0xffffffe6
  35 #define TF_CPU_PM_S2_NO_MC_CLK  0xffffffe5
  36 #define TF_CPU_PM_S1            0xffffffe4
  37 #define TF_CPU_PM_S1_NOFLUSH_L2 0xffffffe7
  38
  39 static unsigned long cpu_boot_addr;
  40
  41 static void tf_generic_smc(u32 type, u32 arg1, u32 arg2)
  42 {
  43         register u32 r0 asm("r0") = type;
  44         register u32 r1 asm("r1") = arg1;
  45         register u32 r2 asm("r2") = arg2;
  46
  47         asm volatile(
  48                 ".arch_extension        sec\n\t"
  49                 "stmfd  sp!, {r4 - r11}\n\t"
  50                 __asmeq("%0", "r0")
  51                 __asmeq("%1", "r1")
  52                 __asmeq("%2", "r2")
  53                 "mov    r3, #0\n\t"
  54                 "mov    r4, #0\n\t"
  55                 "smc    #0\n\t"
  56                 "ldmfd  sp!, {r4 - r11}\n\t"
  57                 :
  58                 : "r" (r0), "r" (r1), "r" (r2)
  59                 : "memory", "r3", "r12", "lr");
  60 }
  61
  62 static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
  63 {
  64         cpu_boot_addr = boot_addr;
  65         tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, cpu_boot_addr, 0);
  66
  67         return 0;
  68 }
  69
  70 static int tf_prepare_idle(void)
  71 {
  72         tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S1_NOFLUSH_L2, cpu_boot_addr);
  73
  74         return 0;
  75 }
  76
  77 #ifdef CONFIG_CACHE_L2X0
  78 static void tf_cache_write_sec(unsigned long val, unsigned int reg)
  79 {
  80         static u32 l2x0_way_mask = 0xff;
  81         static u32 l2x0_aux_ctrl = 0;
  82
  83         switch (reg) {
  84         case L2X0_AUX_CTRL:
  85                 l2x0_aux_ctrl = val;
  86
  87                 if (l2x0_aux_ctrl & BIT(16))
  88                         l2x0_way_mask = 0xffff;
  89                 break;
  90
  91         case L2X0_CTRL:
  92                 if (val == L2X0_CTRL_EN)
  93                         tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_ENABLE,
  94                                        l2x0_aux_ctrl);
  95                 else
  96                         tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_DISABLE,
  97                                        l2x0_way_mask);
  98                 break;
  99
 100         default:
 101                 break;
 102         }
 103 }
 104
 105 static int tf_init_cache(void)
 106 {
 107         outer_cache.write_sec = tf_cache_write_sec;
 108
 109         return 0;
 110 }
 111 #endif /* CONFIG_CACHE_L2X0 */
 112
 113 static const struct firmware_ops trusted_foundations_ops = {
 114         .set_cpu_boot_addr = tf_set_cpu_boot_addr,
 115         .prepare_idle = tf_prepare_idle,
 116 #ifdef CONFIG_CACHE_L2X0
 117         .l2x0_init = tf_init_cache,
 118 #endif
 119 };
 120
 121 void register_trusted_foundations(struct trusted_foundations_platform_data *pd)
 122 {
 123         /*
 124          * we are not using version information for now since currently
 125          * supported SMCs are compatible with all TF releases
 126          */
 127         register_firmware_ops(&trusted_foundations_ops);
 128 }
 129
 130 void of_register_trusted_foundations(void)
 131 {
 132         struct device_node *node;
 133         struct trusted_foundations_platform_data pdata;
 134         int err;
 135
 136         node = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations");
 137         if (!node)
 138                 return;
 139
 140         err = of_property_read_u32(node, "tlm,version-major",
 141                                    &pdata.version_major);
 142         if (err != 0)
 143                 panic("Trusted Foundation: missing version-major property\n");
 144         err = of_property_read_u32(node, "tlm,version-minor",
 145                                    &pdata.version_minor);
 146         if (err != 0)
 147                 panic("Trusted Foundation: missing version-minor property\n");
 148         register_trusted_foundations(&pdata);
 149 }