Merge tag 'efi-2020-07-rc6' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi
[oweals/u-boot.git] / drivers / cpu / imx8_cpu.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2019 NXP
4  */
5
6 #include <common.h>
7 #include <cpu.h>
8 #include <dm.h>
9 #include <thermal.h>
10 #include <asm/system.h>
11 #include <asm/arch/sci/sci.h>
12 #include <asm/arch/sys_proto.h>
13 #include <asm/arch-imx/cpu.h>
14 #include <asm/armv8/cpu.h>
15 #include <linux/bitops.h>
16
17 DECLARE_GLOBAL_DATA_PTR;
18
19 struct cpu_imx_platdata {
20         const char *name;
21         const char *rev;
22         const char *type;
23         u32 cpu_rsrc;
24         u32 cpurev;
25         u32 freq_mhz;
26         u32 mpidr;
27 };
28
29 const char *get_imx8_type(u32 imxtype)
30 {
31         switch (imxtype) {
32         case MXC_CPU_IMX8QXP:
33         case MXC_CPU_IMX8QXP_A0:
34                 return "QXP";
35         case MXC_CPU_IMX8QM:
36                 return "QM";
37         default:
38                 return "??";
39         }
40 }
41
42 const char *get_imx8_rev(u32 rev)
43 {
44         switch (rev) {
45         case CHIP_REV_A:
46                 return "A";
47         case CHIP_REV_B:
48                 return "B";
49         case CHIP_REV_C:
50                 return "C";
51         default:
52                 return "?";
53         }
54 }
55
56 static void set_core_data(struct udevice *dev)
57 {
58         struct cpu_imx_platdata *plat = dev_get_platdata(dev);
59
60         if (device_is_compatible(dev, "arm,cortex-a35")) {
61                 plat->cpu_rsrc = SC_R_A35;
62                 plat->name = "A35";
63         } else if (device_is_compatible(dev, "arm,cortex-a53")) {
64                 plat->cpu_rsrc = SC_R_A53;
65                 plat->name = "A53";
66         } else if (device_is_compatible(dev, "arm,cortex-a72")) {
67                 plat->cpu_rsrc = SC_R_A72;
68                 plat->name = "A72";
69         } else {
70                 plat->cpu_rsrc = SC_R_A53;
71                 plat->name = "?";
72         }
73 }
74
75 #if IS_ENABLED(CONFIG_IMX_SCU_THERMAL)
76 static int cpu_imx_get_temp(struct cpu_imx_platdata *plat)
77 {
78         struct udevice *thermal_dev;
79         int cpu_tmp, ret;
80         int idx = 1; /* use "cpu-thermal0" device */
81
82         if (plat->cpu_rsrc == SC_R_A72)
83                 idx = 2; /* use "cpu-thermal1" device */
84
85         ret = uclass_get_device(UCLASS_THERMAL, idx, &thermal_dev);
86         if (!ret) {
87                 ret = thermal_get_temp(thermal_dev, &cpu_tmp);
88                 if (ret)
89                         return 0xdeadbeef;
90         } else {
91                 return 0xdeadbeef;
92         }
93
94         return cpu_tmp;
95 }
96 #else
97 static int cpu_imx_get_temp(struct cpu_imx_platdata *plat)
98 {
99         return 0;
100 }
101 #endif
102
103 int cpu_imx_get_desc(struct udevice *dev, char *buf, int size)
104 {
105         struct cpu_imx_platdata *plat = dev_get_platdata(dev);
106         int ret, temp;
107
108         if (size < 100)
109                 return -ENOSPC;
110
111         ret = snprintf(buf, size, "NXP i.MX8%s Rev%s %s at %u MHz",
112                        plat->type, plat->rev, plat->name, plat->freq_mhz);
113
114         if (IS_ENABLED(CONFIG_IMX_SCU_THERMAL)) {
115                 temp = cpu_imx_get_temp(plat);
116                 buf = buf + ret;
117                 size = size - ret;
118                 if (temp != 0xdeadbeef)
119                         ret = snprintf(buf, size, " at %dC", temp);
120                 else
121                         ret = snprintf(buf, size, " - invalid sensor data");
122         }
123
124         snprintf(buf + ret, size - ret, "\n");
125
126         return 0;
127 }
128
129 static int cpu_imx_get_info(struct udevice *dev, struct cpu_info *info)
130 {
131         struct cpu_imx_platdata *plat = dev_get_platdata(dev);
132
133         info->cpu_freq = plat->freq_mhz * 1000;
134         info->features = BIT(CPU_FEAT_L1_CACHE) | BIT(CPU_FEAT_MMU);
135         return 0;
136 }
137
138 static int cpu_imx_get_count(struct udevice *dev)
139 {
140         ofnode node;
141         int num = 0;
142
143         ofnode_for_each_subnode(node, dev_ofnode(dev->parent)) {
144                 const char *device_type;
145
146                 if (!ofnode_is_available(node))
147                         continue;
148
149                 device_type = ofnode_read_string(node, "device_type");
150                 if (!device_type)
151                         continue;
152
153                 if (!strcmp(device_type, "cpu"))
154                         num++;
155         }
156
157         return num;
158 }
159
160 static int cpu_imx_get_vendor(struct udevice *dev,  char *buf, int size)
161 {
162         snprintf(buf, size, "NXP");
163         return 0;
164 }
165
166 static int cpu_imx_is_current(struct udevice *dev)
167 {
168         struct cpu_imx_platdata *plat = dev_get_platdata(dev);
169
170         if (plat->mpidr == (read_mpidr() & 0xffff))
171                 return 1;
172
173         return 0;
174 }
175
176 static const struct cpu_ops cpu_imx8_ops = {
177         .get_desc       = cpu_imx_get_desc,
178         .get_info       = cpu_imx_get_info,
179         .get_count      = cpu_imx_get_count,
180         .get_vendor     = cpu_imx_get_vendor,
181         .is_current     = cpu_imx_is_current,
182 };
183
184 static const struct udevice_id cpu_imx8_ids[] = {
185         { .compatible = "arm,cortex-a35" },
186         { .compatible = "arm,cortex-a53" },
187         { .compatible = "arm,cortex-a72" },
188         { }
189 };
190
191 static ulong imx8_get_cpu_rate(struct udevice *dev)
192 {
193         struct cpu_imx_platdata *plat = dev_get_platdata(dev);
194         ulong rate;
195         int ret;
196
197         ret = sc_pm_get_clock_rate(-1, plat->cpu_rsrc, SC_PM_CLK_CPU,
198                                    (sc_pm_clock_rate_t *)&rate);
199         if (ret) {
200                 printf("Could not read CPU frequency: %d\n", ret);
201                 return 0;
202         }
203
204         return rate;
205 }
206
207 static int imx8_cpu_probe(struct udevice *dev)
208 {
209         struct cpu_imx_platdata *plat = dev_get_platdata(dev);
210         u32 cpurev;
211
212         set_core_data(dev);
213         cpurev = get_cpu_rev();
214         plat->cpurev = cpurev;
215         plat->rev = get_imx8_rev(cpurev & 0xFFF);
216         plat->type = get_imx8_type((cpurev & 0xFF000) >> 12);
217         plat->freq_mhz = imx8_get_cpu_rate(dev) / 1000000;
218         plat->mpidr = dev_read_addr(dev);
219         if (plat->mpidr == FDT_ADDR_T_NONE) {
220                 printf("%s: Failed to get CPU reg property\n", __func__);
221                 return -EINVAL;
222         }
223
224         return 0;
225 }
226
227 U_BOOT_DRIVER(cpu_imx8_drv) = {
228         .name           = "imx8x_cpu",
229         .id             = UCLASS_CPU,
230         .of_match       = cpu_imx8_ids,
231         .ops            = &cpu_imx8_ops,
232         .probe          = imx8_cpu_probe,
233         .platdata_auto_alloc_size = sizeof(struct cpu_imx_platdata),
234         .flags          = DM_FLAG_PRE_RELOC,
235 };