1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * SBI initialilization and all extension implementation.
4 *
5 * Copyright (c) 2020 Western Digital Corporation or its affiliates.
6 *
7 * Taken from Linux arch/riscv/kernel/sbi.c
8 */
9
10 #include <common.h>
11 #include <asm/encoding.h>
12 #include <asm/sbi.h>
13
sbi_ecall(int ext,int fid,unsigned long arg0,unsigned long arg1,unsigned long arg2,unsigned long arg3,unsigned long arg4,unsigned long arg5)14 struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
15 unsigned long arg1, unsigned long arg2,
16 unsigned long arg3, unsigned long arg4,
17 unsigned long arg5)
18 {
19 struct sbiret ret;
20
21 register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);
22 register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);
23 register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);
24 register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3);
25 register uintptr_t a4 asm ("a4") = (uintptr_t)(arg4);
26 register uintptr_t a5 asm ("a5") = (uintptr_t)(arg5);
27 register uintptr_t a6 asm ("a6") = (uintptr_t)(fid);
28 register uintptr_t a7 asm ("a7") = (uintptr_t)(ext);
29 asm volatile ("ecall"
30 : "+r" (a0), "+r" (a1)
31 : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7)
32 : "memory");
33 ret.error = a0;
34 ret.value = a1;
35
36 return ret;
37 }
38
39 /**
40 * sbi_set_timer() - Program the timer for next timer event.
41 * @stime_value: The value after which next timer event should fire.
42 *
43 * Return: None
44 */
sbi_set_timer(uint64_t stime_value)45 void sbi_set_timer(uint64_t stime_value)
46 {
47 #if __riscv_xlen == 32
48 sbi_ecall(SBI_EXT_SET_TIMER, SBI_FID_SET_TIMER, stime_value,
49 stime_value >> 32, 0, 0, 0, 0);
50 #else
51 sbi_ecall(SBI_EXT_SET_TIMER, SBI_FID_SET_TIMER, stime_value,
52 0, 0, 0, 0, 0);
53 #endif
54 }
55
56 /**
57 * sbi_get_spec_version() - get current SBI specification version
58 *
59 * Return: version id
60 */
sbi_get_spec_version(void)61 long sbi_get_spec_version(void)
62 {
63 struct sbiret ret;
64
65 ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_SPEC_VERSION,
66 0, 0, 0, 0, 0, 0);
67 if (!ret.error)
68 if (ret.value)
69 return ret.value;
70
71 return -ENOTSUPP;
72 }
73
74 /**
75 * sbi_get_impl_id() - get SBI implementation ID
76 *
77 * Return: implementation ID
78 */
sbi_get_impl_id(void)79 int sbi_get_impl_id(void)
80 {
81 struct sbiret ret;
82
83 ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_IMP_ID,
84 0, 0, 0, 0, 0, 0);
85 if (!ret.error)
86 if (ret.value)
87 return ret.value;
88
89 return -ENOTSUPP;
90 }
91
92 /**
93 * sbi_probe_extension() - Check if an SBI extension ID is supported or not.
94 * @extid: The extension ID to be probed.
95 *
96 * Return: Extension specific nonzero value f yes, -ENOTSUPP otherwise.
97 */
sbi_probe_extension(int extid)98 int sbi_probe_extension(int extid)
99 {
100 struct sbiret ret;
101
102 ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, extid,
103 0, 0, 0, 0, 0);
104 if (!ret.error)
105 if (ret.value)
106 return ret.value;
107
108 return -ENOTSUPP;
109 }
110
111 /**
112 * sbi_srst_reset() - invoke system reset extension
113 *
114 * @type: type of reset
115 * @reason: reason for reset
116 */
sbi_srst_reset(unsigned long type,unsigned long reason)117 void sbi_srst_reset(unsigned long type, unsigned long reason)
118 {
119 sbi_ecall(SBI_EXT_SRST, SBI_EXT_SRST_RESET, type, reason,
120 0, 0, 0, 0);
121 }
122
123 #ifdef CONFIG_SBI_V01
124
125 /**
126 * sbi_console_putchar() - Writes given character to the console device.
127 * @ch: The data to be written to the console.
128 *
129 * Return: None
130 */
sbi_console_putchar(int ch)131 void sbi_console_putchar(int ch)
132 {
133 sbi_ecall(SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, ch, 0, 0, 0, 0, 0);
134 }
135
136 /**
137 * sbi_console_getchar() - Reads a byte from console device.
138 *
139 * Returns the value read from console.
140 */
sbi_console_getchar(void)141 int sbi_console_getchar(void)
142 {
143 struct sbiret ret;
144
145 ret = sbi_ecall(SBI_EXT_0_1_CONSOLE_GETCHAR, 0, 0, 0, 0, 0, 0, 0);
146
147 return ret.error;
148 }
149
150 /**
151 * sbi_clear_ipi() - Clear any pending IPIs for the calling hart.
152 *
153 * Return: None
154 */
sbi_clear_ipi(void)155 void sbi_clear_ipi(void)
156 {
157 sbi_ecall(SBI_EXT_0_1_CLEAR_IPI, 0, 0, 0, 0, 0, 0, 0);
158 }
159
160 /**
161 * sbi_shutdown() - Remove all the harts from executing supervisor code.
162 *
163 * Return: None
164 */
sbi_shutdown(void)165 void sbi_shutdown(void)
166 {
167 sbi_ecall(SBI_EXT_0_1_SHUTDOWN, 0, 0, 0, 0, 0, 0, 0);
168 }
169
170 /**
171 * sbi_send_ipi() - Send an IPI to any hart.
172 * @hart_mask: A cpu mask containing all the target harts.
173 *
174 * Return: None
175 */
sbi_send_ipi(const unsigned long * hart_mask)176 void sbi_send_ipi(const unsigned long *hart_mask)
177 {
178 sbi_ecall(SBI_EXT_SEND_IPI, SBI_FID_SEND_IPI, (unsigned long)hart_mask,
179 0, 0, 0, 0, 0);
180 }
181
182 /**
183 * sbi_remote_fence_i() - Execute FENCE.I instruction on given remote harts.
184 * @hart_mask: A cpu mask containing all the target harts.
185 *
186 * Return: None
187 */
sbi_remote_fence_i(const unsigned long * hart_mask)188 void sbi_remote_fence_i(const unsigned long *hart_mask)
189 {
190 sbi_ecall(SBI_EXT_REMOTE_FENCE_I, SBI_FID_REMOTE_FENCE_I,
191 (unsigned long)hart_mask, 0, 0, 0, 0, 0);
192 }
193
194 /**
195 * sbi_remote_sfence_vma() - Execute SFENCE.VMA instructions on given remote
196 * harts for the specified virtual address range.
197 * @hart_mask: A cpu mask containing all the target harts.
198 * @start: Start of the virtual address
199 * @size: Total size of the virtual address range.
200 *
201 * Return: None
202 */
sbi_remote_sfence_vma(const unsigned long * hart_mask,unsigned long start,unsigned long size)203 void sbi_remote_sfence_vma(const unsigned long *hart_mask,
204 unsigned long start,
205 unsigned long size)
206 {
207 sbi_ecall(SBI_EXT_REMOTE_SFENCE_VMA, SBI_FID_REMOTE_SFENCE_VMA,
208 (unsigned long)hart_mask, start, size, 0, 0, 0);
209 }
210
211 /**
212 * sbi_remote_sfence_vma_asid() - Execute SFENCE.VMA instructions on given
213 * remote harts for a virtual address range belonging to a specific ASID.
214 *
215 * @hart_mask: A cpu mask containing all the target harts.
216 * @start: Start of the virtual address
217 * @size: Total size of the virtual address range.
218 * @asid: The value of address space identifier (ASID).
219 *
220 * Return: None
221 */
sbi_remote_sfence_vma_asid(const unsigned long * hart_mask,unsigned long start,unsigned long size,unsigned long asid)222 void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
223 unsigned long start,
224 unsigned long size,
225 unsigned long asid)
226 {
227 sbi_ecall(SBI_EXT_REMOTE_SFENCE_VMA_ASID,
228 SBI_FID_REMOTE_SFENCE_VMA_ASID,
229 (unsigned long)hart_mask, start, size, asid, 0, 0);
230 }
231
232 #endif /* CONFIG_SBI_V01 */
233