1 /*
2 * Copyright (c) 2018 - 2019 Antmicro <www.antmicro.com>
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #ifndef __RISCV32_LITEX_VEXRISCV_SOC_H_
8 #define __RISCV32_LITEX_VEXRISCV_SOC_H_
9
10 #include "../riscv-privileged/common/soc_common.h"
11 #include <zephyr/devicetree.h>
12 #include <zephyr/arch/riscv/sys_io.h>
13
14 #ifndef _ASMLANGUAGE
15 /* CSR access helpers */
16
litex_read8(unsigned long addr)17 static inline unsigned char litex_read8(unsigned long addr)
18 {
19 #if CONFIG_LITEX_CSR_DATA_WIDTH >= 8
20 return sys_read8(addr);
21 #else
22 #error CSR data width less than 8
23 #endif
24 }
25
litex_read16(unsigned long addr)26 static inline unsigned short litex_read16(unsigned long addr)
27 {
28 #if CONFIG_LITEX_CSR_DATA_WIDTH == 8
29 return (sys_read8(addr) << 8)
30 | sys_read8(addr + 0x4);
31 #elif CONFIG_LITEX_CSR_DATA_WIDTH >= 16
32 return sys_read16(addr);
33 #else
34 #error Unsupported CSR data width
35 #endif
36 }
37
litex_read32(unsigned long addr)38 static inline unsigned int litex_read32(unsigned long addr)
39 {
40 #if CONFIG_LITEX_CSR_DATA_WIDTH == 8
41 return (sys_read8(addr) << 24)
42 | (sys_read8(addr + 0x4) << 16)
43 | (sys_read8(addr + 0x8) << 8)
44 | sys_read8(addr + 0xc);
45 #elif CONFIG_LITEX_CSR_DATA_WIDTH >= 32
46 return sys_read32(addr);
47 #else
48 #error Unsupported CSR data width
49 #endif
50 }
51
litex_read64(unsigned long addr)52 static inline uint64_t litex_read64(unsigned long addr)
53 {
54 #if CONFIG_LITEX_CSR_DATA_WIDTH == 8
55 return (((uint64_t)sys_read8(addr)) << 56)
56 | ((uint64_t)sys_read8(addr + 0x4) << 48)
57 | ((uint64_t)sys_read8(addr + 0x8) << 40)
58 | ((uint64_t)sys_read8(addr + 0xc) << 32)
59 | ((uint64_t)sys_read8(addr + 0x10) << 24)
60 | ((uint64_t)sys_read8(addr + 0x14) << 16)
61 | ((uint64_t)sys_read8(addr + 0x18) << 8)
62 | (uint64_t)sys_read8(addr + 0x1c);
63 #elif CONFIG_LITEX_CSR_DATA_WIDTH == 32
64 return ((uint64_t)sys_read32(addr) << 32) | (uint64_t)sys_read32(addr + 0x4);
65 #elif CONFIG_LITEX_CSR_DATA_WIDTH >= 64
66 return sys_read64(addr);
67 #else
68 #error Unsupported CSR data width
69 #endif
70 }
71
litex_write8(unsigned char value,unsigned long addr)72 static inline void litex_write8(unsigned char value, unsigned long addr)
73 {
74 #if CONFIG_LITEX_CSR_DATA_WIDTH >= 8
75 sys_write8(value, addr);
76 #else
77 #error CSR data width less than 8
78 #endif
79 }
80
litex_write16(unsigned short value,unsigned long addr)81 static inline void litex_write16(unsigned short value, unsigned long addr)
82 {
83 #if CONFIG_LITEX_CSR_DATA_WIDTH == 8
84 sys_write8(value >> 8, addr);
85 sys_write8(value, addr + 0x4);
86 #elif CONFIG_LITEX_CSR_DATA_WIDTH >= 16
87 sys_write16(value, addr);
88 #else
89 #error Unsupported CSR data width
90 #endif
91 }
92
litex_write32(unsigned int value,unsigned long addr)93 static inline void litex_write32(unsigned int value, unsigned long addr)
94 {
95 #if CONFIG_LITEX_CSR_DATA_WIDTH == 8
96 sys_write8(value >> 24, addr);
97 sys_write8(value >> 16, addr + 0x4);
98 sys_write8(value >> 8, addr + 0x8);
99 sys_write8(value, addr + 0xC);
100 #elif CONFIG_LITEX_CSR_DATA_WIDTH >= 32
101 sys_write32(value, addr);
102 #else
103 #error Unsupported CSR data width
104 #endif
105 }
106
107 /*
108 * Operates on uint32_t values only
109 * Size is in bytes and meaningful are 1, 2 or 4
110 * Address must be aligned to 4 bytes
111 */
litex_write(uint32_t addr,uint32_t size,uint32_t value)112 static inline void litex_write(uint32_t addr, uint32_t size, uint32_t value)
113 {
114 switch (size) {
115 case 1:
116 litex_write8(value, addr);
117 break;
118 case 2:
119 litex_write16(value, addr);
120 break;
121 case 4:
122 litex_write32(value, addr);
123 break;
124 default:
125 break;
126 }
127 }
128
129 /*
130 * Operates on uint32_t values only
131 * Size is in bytes and meaningful are 1, 2 or 4
132 * Address must be aligned to 4 bytes
133 */
litex_read(uint32_t addr,uint32_t size)134 static inline uint32_t litex_read(uint32_t addr, uint32_t size)
135 {
136 switch (size) {
137 case 1:
138 return litex_read8(addr);
139 case 2:
140 return litex_read16(addr);
141 case 4:
142 return litex_read32(addr);
143 default:
144 return 0;
145 }
146 }
147
148 #endif /* _ASMLANGUAGE */
149
150 #endif /* __RISCV32_LITEX_VEXRISCV_SOC_H_ */
151
