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13#include <linux/smp.h>
14#include <linux/io.h>
15#include <linux/ioport.h>
16
17#include <asm/cacheflush.h>
18#include <linux/of_address.h>
19
20#include "bcm_kona_smc.h"
21
22static u32 bcm_smc_buffer_phys;
23static void __iomem *bcm_smc_buffer;
24
25struct bcm_kona_smc_data {
26 unsigned service_id;
27 unsigned arg0;
28 unsigned arg1;
29 unsigned arg2;
30 unsigned arg3;
31 unsigned result;
32};
33
34static const struct of_device_id bcm_kona_smc_ids[] __initconst = {
35 {.compatible = "brcm,kona-smc"},
36 {.compatible = "bcm,kona-smc"},
37 {},
38};
39
40
41int __init bcm_kona_smc_init(void)
42{
43 struct device_node *node;
44 const __be32 *prop_val;
45 u64 prop_size = 0;
46 unsigned long buffer_size;
47 u32 buffer_phys;
48
49
50 node = of_find_matching_node(NULL, bcm_kona_smc_ids);
51 if (!node)
52 return -ENODEV;
53
54 prop_val = of_get_address(node, 0, &prop_size, NULL);
55 if (!prop_val)
56 return -EINVAL;
57
58
59 if (prop_size < 4 * sizeof(u32) || prop_size > (u64)ULONG_MAX)
60 return -EINVAL;
61 buffer_size = (unsigned long)prop_size;
62
63 buffer_phys = be32_to_cpup(prop_val);
64 if (!buffer_phys)
65 return -EINVAL;
66
67 bcm_smc_buffer = ioremap(buffer_phys, buffer_size);
68 if (!bcm_smc_buffer)
69 return -ENOMEM;
70 bcm_smc_buffer_phys = buffer_phys;
71
72 pr_info("Kona Secure API initialized\n");
73
74 return 0;
75}
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107static int bcm_kona_do_smc(u32 service_id, u32 buffer_phys)
108{
109 register u32 ip asm("ip");
110 register u32 r0 asm("r0");
111 register u32 r4 asm("r4");
112 register u32 r5 asm("r5");
113 register u32 r6 asm("r6");
114
115 r4 = service_id;
116 r5 = 0x3;
117 r6 = buffer_phys;
118
119 asm volatile (
120
121 __asmeq("%0", "ip")
122 __asmeq("%1", "r0")
123 __asmeq("%2", "r4")
124 __asmeq("%3", "r5")
125 __asmeq("%4", "r6")
126 ".arch_extension sec\n"
127 " smc #0\n"
128 : "=r" (ip), "=r" (r0)
129 : "r" (r4), "r" (r5), "r" (r6)
130 : "r1", "r2", "r3", "r7", "lr");
131
132 BUG_ON(ip != SEC_EXIT_NORMAL);
133
134 return r0;
135}
136
137
138static void __bcm_kona_smc(void *info)
139{
140 struct bcm_kona_smc_data *data = info;
141 u32 __iomem *args = bcm_smc_buffer;
142
143 BUG_ON(smp_processor_id() != 0);
144 BUG_ON(!args);
145
146
147 writel_relaxed(data->arg0, args++);
148 writel_relaxed(data->arg1, args++);
149 writel_relaxed(data->arg2, args++);
150 writel(data->arg3, args);
151
152
153 flush_cache_all();
154
155
156 data->result = bcm_kona_do_smc(data->service_id, bcm_smc_buffer_phys);
157}
158
159unsigned bcm_kona_smc(unsigned service_id, unsigned arg0, unsigned arg1,
160 unsigned arg2, unsigned arg3)
161{
162 struct bcm_kona_smc_data data;
163
164 data.service_id = service_id;
165 data.arg0 = arg0;
166 data.arg1 = arg1;
167 data.arg2 = arg2;
168 data.arg3 = arg3;
169 data.result = 0;
170
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174
175 smp_call_function_single(0, __bcm_kona_smc, &data, 1);
176
177 return data.result;
178}
179