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 <common.h>
9 #include <cpu.h>
10 #include <dm.h>
11 #include <div64.h>
12 #include <linux/clk-provider.h>
13
14 struct at91_cpu_plat {
15 const char *name;
16 ulong cpufreq_mhz;
17 ulong mckfreq_mhz;
18 ulong xtalfreq_mhz;
19 };
20
21 extern char *get_cpu_name(void);
22
at91_cpu_get_name(void)23 const char *at91_cpu_get_name(void)
24 {
25 return get_cpu_name();
26 }
27
at91_cpu_get_desc(const struct udevice * dev,char * buf,int size)28 int at91_cpu_get_desc(const struct udevice *dev, char *buf, int size)
29 {
30 struct at91_cpu_plat *plat = dev_get_plat(dev);
31
32 snprintf(buf, size, "%s\n"
33 "Crystal frequency: %8lu MHz\n"
34 "CPU clock : %8lu MHz\n"
35 "Master clock : %8lu MHz\n",
36 plat->name, plat->xtalfreq_mhz, plat->cpufreq_mhz,
37 plat->mckfreq_mhz);
38
39 return 0;
40 }
41
at91_cpu_get_info(const struct udevice * dev,struct cpu_info * info)42 static int at91_cpu_get_info(const struct udevice *dev, struct cpu_info *info)
43 {
44 struct at91_cpu_plat *plat = dev_get_plat(dev);
45
46 info->cpu_freq = plat->cpufreq_mhz * 1000000;
47 info->features = BIT(CPU_FEAT_L1_CACHE);
48
49 return 0;
50 }
51
at91_cpu_get_count(const struct udevice * dev)52 static int at91_cpu_get_count(const struct udevice *dev)
53 {
54 return 1;
55 }
56
at91_cpu_get_vendor(const struct udevice * dev,char * buf,int size)57 static int at91_cpu_get_vendor(const struct udevice *dev, char *buf, int size)
58 {
59 snprintf(buf, size, "Microchip Technology Inc.");
60
61 return 0;
62 }
63
64 static const struct cpu_ops at91_cpu_ops = {
65 .get_desc = at91_cpu_get_desc,
66 .get_info = at91_cpu_get_info,
67 .get_count = at91_cpu_get_count,
68 .get_vendor = at91_cpu_get_vendor,
69 };
70
71 static const struct udevice_id at91_cpu_ids[] = {
72 { .compatible = "arm,cortex-a7" },
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