1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Trusted Foundations support for ARM CPUs
4 *
5 * Copyright (c) 2013, NVIDIA Corporation.
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/of.h>
11
12 #include <linux/firmware/trusted_foundations.h>
13
14 #include <asm/firmware.h>
15 #include <asm/hardware/cache-l2x0.h>
16 #include <asm/outercache.h>
17
18 #define TF_CACHE_MAINT 0xfffff100
19
20 #define TF_CACHE_ENABLE 1
21 #define TF_CACHE_DISABLE 2
22 #define TF_CACHE_REENABLE 4
23
24 #define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200
25
26 #define TF_CPU_PM 0xfffffffc
27 #define TF_CPU_PM_S3 0xffffffe3
28 #define TF_CPU_PM_S2 0xffffffe6
29 #define TF_CPU_PM_S2_NO_MC_CLK 0xffffffe5
30 #define TF_CPU_PM_S1 0xffffffe4
31 #define TF_CPU_PM_S1_NOFLUSH_L2 0xffffffe7
32
33 static unsigned long tf_idle_mode = TF_PM_MODE_NONE;
34 static unsigned long cpu_boot_addr;
35
tf_generic_smc(u32 type,u32 arg1,u32 arg2)36 static void tf_generic_smc(u32 type, u32 arg1, u32 arg2)
37 {
38 register u32 r0 asm("r0") = type;
39 register u32 r1 asm("r1") = arg1;
40 register u32 r2 asm("r2") = arg2;
41
42 asm volatile(
43 ".arch_extension sec\n\t"
44 "stmfd sp!, {r4 - r11}\n\t"
45 __asmeq("%0", "r0")
46 __asmeq("%1", "r1")
47 __asmeq("%2", "r2")
48 "mov r3, #0\n\t"
49 "mov r4, #0\n\t"
50 "smc #0\n\t"
51 "ldmfd sp!, {r4 - r11}\n\t"
52 :
53 : "r" (r0), "r" (r1), "r" (r2)
54 : "memory", "r3", "r12", "lr");
55 }
56
tf_set_cpu_boot_addr(int cpu,unsigned long boot_addr)57 static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
58 {
59 cpu_boot_addr = boot_addr;
60 tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, cpu_boot_addr, 0);
61
62 return 0;
63 }
64
tf_prepare_idle(unsigned long mode)65 static int tf_prepare_idle(unsigned long mode)
66 {
67 switch (mode) {
68 case TF_PM_MODE_LP0:
69 tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S3, cpu_boot_addr);
70 break;
71
72 case TF_PM_MODE_LP1:
73 tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S2, cpu_boot_addr);
74 break;
75
76 case TF_PM_MODE_LP1_NO_MC_CLK:
77 tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S2_NO_MC_CLK,
78 cpu_boot_addr);
79 break;
80
81 case TF_PM_MODE_LP2:
82 tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S1, cpu_boot_addr);
83 break;
84
85 case TF_PM_MODE_LP2_NOFLUSH_L2:
86 tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S1_NOFLUSH_L2,
87 cpu_boot_addr);
88 break;
89
90 case TF_PM_MODE_NONE:
91 break;
92
93 default:
94 return -EINVAL;
95 }
96
97 tf_idle_mode = mode;
98
99 return 0;
100 }
101
102 #ifdef CONFIG_CACHE_L2X0
tf_cache_write_sec(unsigned long val,unsigned int reg)103 static void tf_cache_write_sec(unsigned long val, unsigned int reg)
104 {
105 u32 enable_op, l2x0_way_mask = 0xff;
106
107 switch (reg) {
108 case L2X0_CTRL:
109 if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_ASSOCIATIVITY_16)
110 l2x0_way_mask = 0xffff;
111
112 switch (tf_idle_mode) {
113 case TF_PM_MODE_LP2:
114 enable_op = TF_CACHE_REENABLE;
115 break;
116
117 default:
118 enable_op = TF_CACHE_ENABLE;
119 break;
120 }
121
122 if (val == L2X0_CTRL_EN)
123 tf_generic_smc(TF_CACHE_MAINT, enable_op,
124 l2x0_saved_regs.aux_ctrl);
125 else
126 tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_DISABLE,
127 l2x0_way_mask);
128 break;
129
130 default:
131 break;
132 }
133 }
134
tf_init_cache(void)135 static int tf_init_cache(void)
136 {
137 outer_cache.write_sec = tf_cache_write_sec;
138
139 return 0;
140 }
141 #endif /* CONFIG_CACHE_L2X0 */
142
143 static const struct firmware_ops trusted_foundations_ops = {
144 .set_cpu_boot_addr = tf_set_cpu_boot_addr,
145 .prepare_idle = tf_prepare_idle,
146 #ifdef CONFIG_CACHE_L2X0
147 .l2x0_init = tf_init_cache,
148 #endif
149 };
150
register_trusted_foundations(struct trusted_foundations_platform_data * pd)151 void register_trusted_foundations(struct trusted_foundations_platform_data *pd)
152 {
153 /*
154 * we are not using version information for now since currently
155 * supported SMCs are compatible with all TF releases
156 */
157 register_firmware_ops(&trusted_foundations_ops);
158 }
159
of_register_trusted_foundations(void)160 void of_register_trusted_foundations(void)
161 {
162 struct device_node *node;
163 struct trusted_foundations_platform_data pdata;
164 int err;
165
166 node = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations");
167 if (!node)
168 return;
169
170 err = of_property_read_u32(node, "tlm,version-major",
171 &pdata.version_major);
172 if (err != 0)
173 panic("Trusted Foundation: missing version-major property\n");
174 err = of_property_read_u32(node, "tlm,version-minor",
175 &pdata.version_minor);
176 if (err != 0)
177 panic("Trusted Foundation: missing version-minor property\n");
178 register_trusted_foundations(&pdata);
179 }
180
trusted_foundations_registered(void)181 bool trusted_foundations_registered(void)
182 {
183 return firmware_ops == &trusted_foundations_ops;
184 }
185