1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2020 Microchip Technology Inc. and its subsidiaries
4 *
5 * Author: Claudiu Beznea <claudiu.beznea@microchip.com>
6 */
7
8 #include <cpu.h>
9 #include <dm.h>
10 #include <div64.h>
11 #include <linux/clk-provider.h>
12
13 struct at91_cpu_plat {
14 const char *name;
15 ulong cpufreq_mhz;
16 ulong mckfreq_mhz;
17 ulong xtalfreq_mhz;
18 };
19
20 extern char *get_cpu_name(void);
21
at91_cpu_get_name(void)22 const char *at91_cpu_get_name(void)
23 {
24 return get_cpu_name();
25 }
26
at91_cpu_get_desc(const struct udevice * dev,char * buf,int size)27 int at91_cpu_get_desc(const struct udevice *dev, char *buf, int size)
28 {
29 struct at91_cpu_plat *plat = dev_get_plat(dev);
30
31 snprintf(buf, size, "%s\n"
32 "Crystal frequency: %8lu MHz\n"
33 "CPU clock : %8lu MHz\n"
34 "Master clock : %8lu MHz\n",
35 plat->name, plat->xtalfreq_mhz, plat->cpufreq_mhz,
36 plat->mckfreq_mhz);
37
38 return 0;
39 }
40
at91_cpu_get_info(const struct udevice * dev,struct cpu_info * info)41 static int at91_cpu_get_info(const struct udevice *dev, struct cpu_info *info)
42 {
43 struct at91_cpu_plat *plat = dev_get_plat(dev);
44
45 info->cpu_freq = plat->cpufreq_mhz * 1000000;
46 info->features = BIT(CPU_FEAT_L1_CACHE);
47
48 return 0;
49 }
50
at91_cpu_get_count(const struct udevice * dev)51 static int at91_cpu_get_count(const struct udevice *dev)
52 {
53 return 1;
54 }
55
at91_cpu_get_vendor(const struct udevice * dev,char * buf,int size)56 static int at91_cpu_get_vendor(const struct udevice *dev, char *buf, int size)
57 {
58 snprintf(buf, size, "Microchip Technology Inc.");
59
60 return 0;
61 }
62
63 static const struct cpu_ops at91_cpu_ops = {
64 .get_desc = at91_cpu_get_desc,
65 .get_info = at91_cpu_get_info,
66 .get_count = at91_cpu_get_count,
67 .get_vendor = at91_cpu_get_vendor,
68 };
69
70 static const struct udevice_id at91_cpu_ids[] = {
71 { .compatible = "arm,cortex-a7" },
72 { .compatible = "arm,arm926ej-s" },
73 { /* Sentinel. */ }
74 };
75
at91_cpu_probe(struct udevice * dev)76 static int at91_cpu_probe(struct udevice *dev)
77 {
78 struct at91_cpu_plat *plat = dev_get_plat(dev);
79 struct clk clk;
80 ulong rate;
81 int ret;
82
83 ret = clk_get_by_index(dev, 0, &clk);
84 if (ret)
85 return ret;
86
87 rate = clk_get_rate(&clk);
88 if (!rate)
89 return -ENOTSUPP;
90 plat->cpufreq_mhz = DIV_ROUND_CLOSEST_ULL(rate, 1000000);
91
92 ret = clk_get_by_index(dev, 1, &clk);
93 if (ret)
94 return ret;
95
96 rate = clk_get_rate(&clk);
97 if (!rate)
98 return -ENOTSUPP;
99 plat->mckfreq_mhz = DIV_ROUND_CLOSEST_ULL(rate, 1000000);
100
101 ret = clk_get_by_index(dev, 2, &clk);
102 if (ret)
103 return ret;
104
105 rate = clk_get_rate(&clk);
106 if (!rate)
107 return -ENOTSUPP;
108 plat->xtalfreq_mhz = DIV_ROUND_CLOSEST_ULL(rate, 1000000);
109
110 plat->name = get_cpu_name();
111
112 return 0;
113 }
114
115 U_BOOT_DRIVER(cpu_at91_drv) = {
116 .name = "at91-cpu",
117 .id = UCLASS_CPU,
118 .of_match = at91_cpu_ids,
119 .ops = &at91_cpu_ops,
120 .probe = at91_cpu_probe,
121 .plat_auto = sizeof(struct at91_cpu_plat),
122 .flags = DM_FLAG_PRE_RELOC,
123 };
124