riscv: Add basic support for SBI v0.2

[oweals/u-boot.git] / arch / riscv / include / asm / sbi.h

diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 187ca58dc0cf97022968cae8a4b6ab98c2a9c222..fc8637cb3cd2f85adf80daf3aec522e270cad5ea 100644 (file)
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -11,91 +11,68 @@
 
 #include <linux/types.h>
 
-#define SBI_EXT_0_1_SET_TIMER 0x0
-#define SBI_EXT_0_1_CONSOLE_PUTCHAR 0x1
-#define SBI_EXT_0_1_CONSOLE_GETCHAR 0x2
-#define SBI_EXT_0_1_CLEAR_IPI 0x3
-#define SBI_EXT_0_1_SEND_IPI 0x4
-#define SBI_EXT_0_1_REMOTE_FENCE_I 0x5
-#define SBI_EXT_0_1_REMOTE_SFENCE_VMA 0x6
-#define SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID 0x7
-#define SBI_EXT_0_1_SHUTDOWN 0x8
+enum sbi_ext_id {
+       SBI_EXT_0_1_SET_TIMER = 0x0,
+       SBI_EXT_0_1_CONSOLE_PUTCHAR = 0x1,
+       SBI_EXT_0_1_CONSOLE_GETCHAR = 0x2,
+       SBI_EXT_0_1_CLEAR_IPI = 0x3,
+       SBI_EXT_0_1_SEND_IPI = 0x4,
+       SBI_EXT_0_1_REMOTE_FENCE_I = 0x5,
+       SBI_EXT_0_1_REMOTE_SFENCE_VMA = 0x6,
+       SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID = 0x7,
+       SBI_EXT_0_1_SHUTDOWN = 0x8,
+       SBI_EXT_BASE = 0x10,
+};
 
-#define SBI_CALL(which, arg0, arg1, arg2, arg3) ({             \
-       register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);   \
-       register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);   \
-       register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);   \
-       register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3);   \
-       register uintptr_t a7 asm ("a7") = (uintptr_t)(which);  \
-       asm volatile ("ecall"                                   \
-                     : "+r" (a0)                               \
-                     : "r" (a1), "r" (a2), "r" (a3), "r" (a7)  \
-                     : "memory");                              \
-       a0;                                                     \
-})
+enum sbi_ext_base_fid {
+       SBI_EXT_BASE_GET_SPEC_VERSION = 0,
+       SBI_EXT_BASE_GET_IMP_ID,
+       SBI_EXT_BASE_GET_IMP_VERSION,
+       SBI_EXT_BASE_PROBE_EXT,
+       SBI_EXT_BASE_GET_MVENDORID,
+       SBI_EXT_BASE_GET_MARCHID,
+       SBI_EXT_BASE_GET_MIMPID,
+};
 
-/* Lazy implementations until SBI is finalized */
-#define SBI_CALL_0(which) SBI_CALL(which, 0, 0, 0, 0)
-#define SBI_CALL_1(which, arg0) SBI_CALL(which, arg0, 0, 0, 0)
-#define SBI_CALL_2(which, arg0, arg1) SBI_CALL(which, arg0, arg1, 0, 0)
-#define SBI_CALL_3(which, arg0, arg1, arg2) \
-               SBI_CALL(which, arg0, arg1, arg2, 0)
-#define SBI_CALL_4(which, arg0, arg1, arg2, arg3) \
-               SBI_CALL(which, arg0, arg1, arg2, arg3)
+#define SBI_SPEC_VERSION_DEFAULT       0x1
+#define SBI_SPEC_VERSION_MAJOR_SHIFT   24
+#define SBI_SPEC_VERSION_MAJOR_MASK    0x7f
+#define SBI_SPEC_VERSION_MINOR_MASK    0xffffff
 
-static inline void sbi_console_putchar(int ch)
-{
-       SBI_CALL_1(SBI_EXT_0_1_CONSOLE_PUTCHAR, ch);
-}
+/* SBI return error codes */
+#define SBI_SUCCESS                    0
+#define SBI_ERR_FAILURE                        -1
+#define SBI_ERR_NOT_SUPPORTED          -2
+#define SBI_ERR_INVALID_PARAM          -3
+#define SBI_ERR_DENIED                 -4
+#define SBI_ERR_INVALID_ADDRESS                -5
 
-static inline int sbi_console_getchar(void)
-{
-       return SBI_CALL_0(SBI_EXT_0_1_CONSOLE_GETCHAR);
-}
+extern unsigned long sbi_spec_version;
+struct sbiret {
+       long error;
+       long value;
+};
 
-static inline void sbi_set_timer(uint64_t stime_value)
-{
-#if __riscv_xlen == 32
-       SBI_CALL_2(SBI_EXT_0_1_SET_TIMER, stime_value, stime_value >> 32);
-#else
-       SBI_CALL_1(SBI_EXT_0_1_SET_TIMER, stime_value);
-#endif
-}
-
-static inline void sbi_shutdown(void)
-{
-       SBI_CALL_0(SBI_EXT_0_1_SHUTDOWN);
-}
-
-static inline void sbi_clear_ipi(void)
-{
-       SBI_CALL_0(SBI_EXT_0_1_CLEAR_IPI);
-}
-
-static inline void sbi_send_ipi(const unsigned long *hart_mask)
-{
-       SBI_CALL_1(SBI_EXT_0_1_SEND_IPI, hart_mask);
-}
-
-static inline void sbi_remote_fence_i(const unsigned long *hart_mask)
-{
-       SBI_CALL_1(SBI_EXT_0_1_REMOTE_FENCE_I, hart_mask);
-}
+struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
+                       unsigned long arg1, unsigned long arg2,
+                       unsigned long arg3, unsigned long arg4,
+                       unsigned long arg5);
 
-static inline void sbi_remote_sfence_vma(const unsigned long *hart_mask,
-                                        unsigned long start,
-                                        unsigned long size)
-{
-       SBI_CALL_3(SBI_EXT_0_1_REMOTE_SFENCE_VMA, hart_mask, start, size);
-}
+void sbi_console_putchar(int ch);
+int sbi_console_getchar(void);
+void sbi_clear_ipi(void);
+void sbi_shutdown(void);
+void sbi_set_timer(uint64_t stime_value);
+void sbi_send_ipi(const unsigned long *hart_mask);
+void sbi_remote_fence_i(const unsigned long *hart_mask);
+void sbi_remote_sfence_vma(const unsigned long *hart_mask,
+                          unsigned long start,
+                          unsigned long size);
+void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
+                               unsigned long start,
+                               unsigned long size,
+                               unsigned long asid);
 
-static inline void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
-                                             unsigned long start,
-                                             unsigned long size,
-                                             unsigned long asid)
-{
-       SBI_CALL_4(SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, hart_mask,
-                  start, size, asid);
-}
+int sbi_probe_extension(int ext);
 
 #endif