Commit | Line | Data |
---|---|---|
6a438309 AB |
1 | /* |
2 | * Pistachio platform setup | |
3 | * | |
4 | * Copyright (C) 2014 Google, Inc. | |
ae07ea85 | 5 | * Copyright (C) 2016 Imagination Technologies |
6a438309 AB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms and conditions of the GNU General Public License, | |
9 | * version 2, as published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/init.h> | |
ae07ea85 | 13 | #include <linux/io.h> |
6a438309 AB |
14 | #include <linux/kernel.h> |
15 | #include <linux/of_address.h> | |
16 | #include <linux/of_fdt.h> | |
17 | #include <linux/of_platform.h> | |
18 | ||
19 | #include <asm/cacheflush.h> | |
20 | #include <asm/dma-coherence.h> | |
21 | #include <asm/fw/fw.h> | |
22 | #include <asm/mips-boards/generic.h> | |
23 | #include <asm/mips-cm.h> | |
24 | #include <asm/mips-cpc.h> | |
25 | #include <asm/prom.h> | |
26 | #include <asm/smp-ops.h> | |
27 | #include <asm/traps.h> | |
28 | ||
ae07ea85 JH |
29 | /* |
30 | * Core revision register decoding | |
31 | * Bits 23 to 20: Major rev | |
32 | * Bits 15 to 8: Minor rev | |
33 | * Bits 7 to 0: Maintenance rev | |
34 | */ | |
35 | #define PISTACHIO_CORE_REV_REG 0xB81483D0 | |
36 | #define PISTACHIO_CORE_REV_A1 0x00100006 | |
37 | #define PISTACHIO_CORE_REV_B0 0x00100106 | |
38 | ||
6a438309 AB |
39 | const char *get_system_type(void) |
40 | { | |
ae07ea85 JH |
41 | u32 core_rev; |
42 | const char *sys_type; | |
43 | ||
44 | core_rev = __raw_readl((const void *)PISTACHIO_CORE_REV_REG); | |
45 | ||
46 | switch (core_rev) { | |
47 | case PISTACHIO_CORE_REV_B0: | |
48 | sys_type = "IMG Pistachio SoC (B0)"; | |
49 | break; | |
50 | ||
51 | case PISTACHIO_CORE_REV_A1: | |
52 | sys_type = "IMG Pistachio SoC (A1)"; | |
53 | break; | |
54 | ||
55 | default: | |
56 | sys_type = "IMG Pistachio SoC"; | |
57 | break; | |
58 | } | |
59 | ||
60 | return sys_type; | |
6a438309 AB |
61 | } |
62 | ||
63 | static void __init plat_setup_iocoherency(void) | |
64 | { | |
65 | /* | |
66 | * Kernel has been configured with software coherency | |
67 | * but we might choose to turn it off and use hardware | |
68 | * coherency instead. | |
69 | */ | |
70 | if (mips_cm_numiocu() != 0) { | |
71 | /* Nothing special needs to be done to enable coherency */ | |
72 | pr_info("CMP IOCU detected\n"); | |
73 | hw_coherentio = 1; | |
74 | if (coherentio == 0) | |
75 | pr_info("Hardware DMA cache coherency disabled\n"); | |
76 | else | |
77 | pr_info("Hardware DMA cache coherency enabled\n"); | |
78 | } else { | |
79 | if (coherentio == 1) | |
80 | pr_info("Hardware DMA cache coherency unsupported, but enabled from command line!\n"); | |
81 | else | |
82 | pr_info("Software DMA cache coherency enabled\n"); | |
83 | } | |
84 | } | |
85 | ||
86 | void __init plat_mem_setup(void) | |
87 | { | |
88 | if (fw_arg0 != -2) | |
89 | panic("Device-tree not present"); | |
90 | ||
91 | __dt_setup_arch((void *)fw_arg1); | |
6a438309 AB |
92 | |
93 | plat_setup_iocoherency(); | |
94 | } | |
95 | ||
6b5e741e JH |
96 | #define DEFAULT_CPC_BASE_ADDR 0x1bde0000 |
97 | #define DEFAULT_CDMM_BASE_ADDR 0x1bdd0000 | |
6a438309 AB |
98 | |
99 | phys_addr_t mips_cpc_default_phys_base(void) | |
100 | { | |
101 | return DEFAULT_CPC_BASE_ADDR; | |
102 | } | |
103 | ||
6b5e741e JH |
104 | phys_addr_t mips_cdmm_phys_base(void) |
105 | { | |
106 | return DEFAULT_CDMM_BASE_ADDR; | |
107 | } | |
108 | ||
6a438309 AB |
109 | static void __init mips_nmi_setup(void) |
110 | { | |
111 | void *base; | |
112 | extern char except_vec_nmi; | |
113 | ||
114 | base = cpu_has_veic ? | |
115 | (void *)(CAC_BASE + 0xa80) : | |
116 | (void *)(CAC_BASE + 0x380); | |
117 | memcpy(base, &except_vec_nmi, 0x80); | |
118 | flush_icache_range((unsigned long)base, | |
119 | (unsigned long)base + 0x80); | |
120 | } | |
121 | ||
122 | static void __init mips_ejtag_setup(void) | |
123 | { | |
124 | void *base; | |
125 | extern char except_vec_ejtag_debug; | |
126 | ||
127 | base = cpu_has_veic ? | |
128 | (void *)(CAC_BASE + 0xa00) : | |
129 | (void *)(CAC_BASE + 0x300); | |
130 | memcpy(base, &except_vec_ejtag_debug, 0x80); | |
131 | flush_icache_range((unsigned long)base, | |
132 | (unsigned long)base + 0x80); | |
133 | } | |
134 | ||
135 | void __init prom_init(void) | |
136 | { | |
137 | board_nmi_handler_setup = mips_nmi_setup; | |
138 | board_ejtag_handler_setup = mips_ejtag_setup; | |
139 | ||
140 | mips_cm_probe(); | |
141 | mips_cpc_probe(); | |
142 | register_cps_smp_ops(); | |
ae07ea85 JH |
143 | |
144 | pr_info("SoC Type: %s\n", get_system_type()); | |
6a438309 AB |
145 | } |
146 | ||
147 | void __init prom_free_prom_memory(void) | |
148 | { | |
149 | } | |
150 | ||
151 | void __init device_tree_init(void) | |
152 | { | |
153 | if (!initial_boot_params) | |
154 | return; | |
155 | ||
156 | unflatten_and_copy_device_tree(); | |
157 | } | |
158 | ||
159 | static int __init plat_of_setup(void) | |
160 | { | |
161 | if (!of_have_populated_dt()) | |
162 | panic("Device tree not present"); | |
163 | ||
164 | if (of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL)) | |
165 | panic("Failed to populate DT"); | |
166 | ||
167 | return 0; | |
168 | } | |
169 | arch_initcall(plat_of_setup); |