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/trusted_foundations.h>
22
23 #define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200
24
25 #define TF_CPU_PM 0xfffffffc
26 #define TF_CPU_PM_S3 0xffffffe3
27 #define TF_CPU_PM_S2 0xffffffe6
28 #define TF_CPU_PM_S2_NO_MC_CLK 0xffffffe5
29 #define TF_CPU_PM_S1 0xffffffe4
30 #define TF_CPU_PM_S1_NOFLUSH_L2 0xffffffe7
31
32 static unsigned long cpu_boot_addr;
33
tf_generic_smc(u32 type,u32 arg1,u32 arg2)34 static void __naked tf_generic_smc(u32 type, u32 arg1, u32 arg2)
35 {
36 asm volatile(
37 ".arch_extension sec\n\t"
38 "stmfd sp!, {r4 - r11, lr}\n\t"
39 __asmeq("%0", "r0")
40 __asmeq("%1", "r1")
41 __asmeq("%2", "r2")
42 "mov r3, #0\n\t"
43 "mov r4, #0\n\t"
44 "smc #0\n\t"
45 "ldmfd sp!, {r4 - r11, pc}"
46 :
47 : "r" (type), "r" (arg1), "r" (arg2)
48 : "memory");
49 }
50
tf_set_cpu_boot_addr(int cpu,unsigned long boot_addr)51 static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
52 {
53 cpu_boot_addr = boot_addr;
54 tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, cpu_boot_addr, 0);
55
56 return 0;
57 }
58
tf_prepare_idle(void)59 static int tf_prepare_idle(void)
60 {
61 tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S1_NOFLUSH_L2, cpu_boot_addr);
62
63 return 0;
64 }
65
66 static const struct firmware_ops trusted_foundations_ops = {
67 .set_cpu_boot_addr = tf_set_cpu_boot_addr,
68 .prepare_idle = tf_prepare_idle,
69 };
70
register_trusted_foundations(struct trusted_foundations_platform_data * pd)71 void register_trusted_foundations(struct trusted_foundations_platform_data *pd)
72 {
73 /*
74 * we are not using version information for now since currently
75 * supported SMCs are compatible with all TF releases
76 */
77 register_firmware_ops(&trusted_foundations_ops);
78 }
79
of_register_trusted_foundations(void)80 void of_register_trusted_foundations(void)
81 {
82 struct device_node *node;
83 struct trusted_foundations_platform_data pdata;
84 int err;
85
86 node = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations");
87 if (!node)
88 return;
89
90 err = of_property_read_u32(node, "tlm,version-major",
91 &pdata.version_major);
92 if (err != 0)
93 panic("Trusted Foundation: missing version-major property\n");
94 err = of_property_read_u32(node, "tlm,version-minor",
95 &pdata.version_minor);
96 if (err != 0)
97 panic("Trusted Foundation: missing version-minor property\n");
98 register_trusted_foundations(&pdata);
99 }
100