be7f99c1de4fb7d6e29f9a8bf3fe4336f50681ea
[platform/kernel/u-boot.git] / arch / nios2 / cpu / cpu.c
1 /*
2  * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
3  * Scott McNutt <smcnutt@psyent.com>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 #include <common.h>
9 #include <cpu.h>
10 #include <dm.h>
11 #include <errno.h>
12 #include <asm/cache.h>
13
14 DECLARE_GLOBAL_DATA_PTR;
15
16 #ifdef CONFIG_DISPLAY_CPUINFO
17 int print_cpuinfo(void)
18 {
19         printf("CPU:   Nios-II\n");
20         return 0;
21 }
22 #endif /* CONFIG_DISPLAY_CPUINFO */
23
24 #ifdef CONFIG_ALTERA_SYSID
25 int checkboard(void)
26 {
27         display_sysid();
28         return 0;
29 }
30 #endif
31
32 int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
33 {
34         disable_interrupts();
35         /* indirect call to go beyond 256MB limitation of toolchain */
36         nios2_callr(gd->arch.reset_addr);
37         return 0;
38 }
39
40 /*
41  * COPY EXCEPTION TRAMPOLINE -- copy the tramp to the
42  * exception address. Define CONFIG_ROM_STUBS to prevent
43  * the copy (e.g. exception in flash or in other
44  * softare/firmware component).
45  */
46 #ifndef CONFIG_ROM_STUBS
47 static void copy_exception_trampoline(void)
48 {
49         extern int _except_start, _except_end;
50         void *except_target = (void *)gd->arch.exception_addr;
51
52         if (&_except_start != except_target) {
53                 memcpy(except_target, &_except_start,
54                        &_except_end - &_except_start);
55                 flush_cache(gd->arch.exception_addr,
56                             &_except_end - &_except_start);
57         }
58 }
59 #endif
60
61 int arch_cpu_init_dm(void)
62 {
63         struct udevice *dev;
64         int ret;
65
66         ret = uclass_first_device(UCLASS_CPU, &dev);
67         if (ret)
68                 return ret;
69         if (!dev)
70                 return -ENODEV;
71
72         gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
73 #ifndef CONFIG_ROM_STUBS
74         copy_exception_trampoline();
75 #endif
76
77         return 0;
78 }
79
80 static int altera_nios2_get_desc(struct udevice *dev, char *buf, int size)
81 {
82         const char *cpu_name = "Nios-II";
83
84         if (size < strlen(cpu_name))
85                 return -ENOSPC;
86         strcpy(buf, cpu_name);
87
88         return 0;
89 }
90
91 static int altera_nios2_get_info(struct udevice *dev, struct cpu_info *info)
92 {
93         info->cpu_freq = gd->cpu_clk;
94         info->features = (1 << CPU_FEAT_L1_CACHE) |
95                 (gd->arch.has_mmu ? (1 << CPU_FEAT_MMU) : 0);
96
97         return 0;
98 }
99
100 static int altera_nios2_get_count(struct udevice *dev)
101 {
102         return 1;
103 }
104
105 static int altera_nios2_probe(struct udevice *dev)
106 {
107         const void *blob = gd->fdt_blob;
108         int node = dev->of_offset;
109
110         gd->cpu_clk = fdtdec_get_int(blob, node,
111                 "clock-frequency", 0);
112         gd->arch.dcache_line_size = fdtdec_get_int(blob, node,
113                 "dcache-line-size", 0);
114         gd->arch.icache_line_size = fdtdec_get_int(blob, node,
115                 "icache-line-size", 0);
116         gd->arch.dcache_size = fdtdec_get_int(blob, node,
117                 "dcache-size", 0);
118         gd->arch.icache_size = fdtdec_get_int(blob, node,
119                 "icache-size", 0);
120         gd->arch.reset_addr = fdtdec_get_int(blob, node,
121                 "altr,reset-addr", 0);
122         gd->arch.exception_addr = fdtdec_get_int(blob, node,
123                 "altr,exception-addr", 0);
124         gd->arch.has_initda = fdtdec_get_int(blob, node,
125                 "altr,has-initda", 0);
126         gd->arch.has_mmu = fdtdec_get_int(blob, node,
127                 "altr,has-mmu", 0);
128         gd->arch.io_region_base = gd->arch.has_mmu ? 0xe0000000 : 0x80000000;
129         gd->arch.mem_region_base = gd->arch.has_mmu ? 0xc0000000 : 0x00000000;
130         gd->arch.physaddr_mask = gd->arch.has_mmu ? 0x1fffffff : 0x7fffffff;
131
132         return 0;
133 }
134
135 static const struct cpu_ops altera_nios2_ops = {
136         .get_desc       = altera_nios2_get_desc,
137         .get_info       = altera_nios2_get_info,
138         .get_count      = altera_nios2_get_count,
139 };
140
141 static const struct udevice_id altera_nios2_ids[] = {
142         { .compatible = "altr,nios2-1.0" },
143         { .compatible = "altr,nios2-1.1" },
144         { }
145 };
146
147 U_BOOT_DRIVER(altera_nios2) = {
148         .name           = "altera_nios2",
149         .id             = UCLASS_CPU,
150         .of_match       = altera_nios2_ids,
151         .probe          = altera_nios2_probe,
152         .ops            = &altera_nios2_ops,
153         .flags          = DM_FLAG_PRE_RELOC,
154 };