1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Support for Ingenic SoCs
4 *
5 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
6 * Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org>
7 * Copyright (C) 2020 Paul Cercueil <paul@crapouillou.net>
8 */
9
10 #include <linux/clk.h>
11 #include <linux/of.h>
12 #include <linux/of_address.h>
13 #include <linux/of_fdt.h>
14 #include <linux/pm.h>
15 #include <linux/sizes.h>
16 #include <linux/suspend.h>
17 #include <linux/types.h>
18
19 #include <asm/bootinfo.h>
20 #include <asm/io.h>
21 #include <asm/machine.h>
22 #include <asm/reboot.h>
23
24 static __init char *ingenic_get_system_type(unsigned long machtype)
25 {
26 switch (machtype) {
27 case MACH_INGENIC_X2100:
28 return "X2100";
29 case MACH_INGENIC_X2000H:
30 return "X2000H";
31 case MACH_INGENIC_X2000E:
32 return "X2000E";
33 case MACH_INGENIC_X2000:
34 return "X2000";
35 case MACH_INGENIC_X1830:
36 return "X1830";
37 case MACH_INGENIC_X1000E:
38 return "X1000E";
39 case MACH_INGENIC_X1000:
40 return "X1000";
41 case MACH_INGENIC_JZ4780:
42 return "JZ4780";
43 case MACH_INGENIC_JZ4775:
44 return "JZ4775";
45 case MACH_INGENIC_JZ4770:
46 return "JZ4770";
47 case MACH_INGENIC_JZ4760B:
48 return "JZ4760B";
49 case MACH_INGENIC_JZ4760:
50 return "JZ4760";
51 case MACH_INGENIC_JZ4755:
52 return "JZ4755";
53 case MACH_INGENIC_JZ4750:
54 return "JZ4750";
55 case MACH_INGENIC_JZ4725B:
56 return "JZ4725B";
57 case MACH_INGENIC_JZ4730:
58 return "JZ4730";
59 default:
60 return "JZ4740";
61 }
62 }
63
64 #define INGENIC_CGU_BASE 0x10000000
65 #define JZ4750_CGU_CPCCR_ECS BIT(30)
66 #define JZ4760_CGU_CPCCR_ECS BIT(31)
67
68 static __init void ingenic_force_12M_ext(const void *fdt, unsigned int mask)
69 {
70 const __be32 *prop;
71 unsigned int cpccr;
72 void __iomem *cgu;
73 bool use_div;
74 int offset;
75
76 offset = fdt_path_offset(fdt, "/ext");
77 if (offset < 0)
78 return;
79
80 prop = fdt_getprop(fdt, offset, "clock-frequency", NULL);
81 if (!prop)
82 return;
83
84 /*
85 * If the external oscillator is 24 MHz, enable the /2 divider to
86 * drive it down to 12 MHz, since this is what the hardware can work
87 * with.
88 * The 16 MHz cutoff value is arbitrary; setting it to 12 MHz would not
89 * work as the crystal frequency (as reported in the Device Tree) might
90 * be slightly above this value.
91 */
92 use_div = be32_to_cpup(prop) >= 16000000;
93
94 cgu = ioremap(INGENIC_CGU_BASE, 0x4);
95 if (!cgu)
96 return;
97
98 cpccr = ioread32(cgu);
99 if (use_div)
100 cpccr |= mask;
101 else
102 cpccr &= ~mask;
103 iowrite32(cpccr, cgu);
104
105 iounmap(cgu);
106 }
107
108 static __init const void *ingenic_fixup_fdt(const void *fdt, const void *match_data)
109 {
110 /*
111 * Old devicetree files for the qi,lb60 board did not have a /memory
112 * node. Hardcode the memory info here.
113 */
114 if (!fdt_node_check_compatible(fdt, 0, "qi,lb60") &&
115 fdt_path_offset(fdt, "/memory") < 0)
116 early_init_dt_add_memory_arch(0, SZ_32M);
117
118 mips_machtype = (unsigned long)match_data;
119 system_type = ingenic_get_system_type(mips_machtype);
120
121 switch (mips_machtype) {
122 case MACH_INGENIC_JZ4750:
123 case MACH_INGENIC_JZ4755:
124 ingenic_force_12M_ext(fdt, JZ4750_CGU_CPCCR_ECS);
125 break;
126 case MACH_INGENIC_JZ4760:
127 ingenic_force_12M_ext(fdt, JZ4760_CGU_CPCCR_ECS);
128 break;
129 default:
130 break;
131 }
132
133 return fdt;
134 }
135
136 static const struct of_device_id ingenic_of_match[] __initconst = {
137 { .compatible = "ingenic,jz4730", .data = (void *)MACH_INGENIC_JZ4730 },
138 { .compatible = "ingenic,jz4740", .data = (void *)MACH_INGENIC_JZ4740 },
139 { .compatible = "ingenic,jz4725b", .data = (void *)MACH_INGENIC_JZ4725B },
140 { .compatible = "ingenic,jz4750", .data = (void *)MACH_INGENIC_JZ4750 },
141 { .compatible = "ingenic,jz4755", .data = (void *)MACH_INGENIC_JZ4755 },
142 { .compatible = "ingenic,jz4760", .data = (void *)MACH_INGENIC_JZ4760 },
143 { .compatible = "ingenic,jz4760b", .data = (void *)MACH_INGENIC_JZ4760B },
144 { .compatible = "ingenic,jz4770", .data = (void *)MACH_INGENIC_JZ4770 },
145 { .compatible = "ingenic,jz4775", .data = (void *)MACH_INGENIC_JZ4775 },
146 { .compatible = "ingenic,jz4780", .data = (void *)MACH_INGENIC_JZ4780 },
147 { .compatible = "ingenic,x1000", .data = (void *)MACH_INGENIC_X1000 },
148 { .compatible = "ingenic,x1000e", .data = (void *)MACH_INGENIC_X1000E },
149 { .compatible = "ingenic,x1830", .data = (void *)MACH_INGENIC_X1830 },
150 { .compatible = "ingenic,x2000", .data = (void *)MACH_INGENIC_X2000 },
151 { .compatible = "ingenic,x2000e", .data = (void *)MACH_INGENIC_X2000E },
152 { .compatible = "ingenic,x2000h", .data = (void *)MACH_INGENIC_X2000H },
153 { .compatible = "ingenic,x2100", .data = (void *)MACH_INGENIC_X2100 },
154 {}
155 };
156
157 MIPS_MACHINE(ingenic) = {
158 .matches = ingenic_of_match,
159 .fixup_fdt = ingenic_fixup_fdt,
160 };
161
162 static void ingenic_wait_instr(void)
163 {
164 __asm__(".set push;\n"
165 ".set mips3;\n"
166 "wait;\n"
167 ".set pop;\n"
168 );
169 }
170
171 static void ingenic_halt(void)
172 {
173 for (;;)
174 ingenic_wait_instr();
175 }
176
177 static int ingenic_pm_enter(suspend_state_t state)
178 {
179 ingenic_wait_instr();
180
181 return 0;
182 }
183
184 static const struct platform_suspend_ops ingenic_pm_ops = {
185 .valid = suspend_valid_only_mem,
186 .enter = ingenic_pm_enter,
187 };
188
189 static int __init ingenic_pm_init(void)
190 {
191 if (boot_cpu_type() == CPU_XBURST) {
192 if (IS_ENABLED(CONFIG_PM_SLEEP))
193 suspend_set_ops(&ingenic_pm_ops);
194 _machine_halt = ingenic_halt;
195 }
196
197 return 0;
198
199 }
200 late_initcall(ingenic_pm_init);
201
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