Merge tag 'amlogic-drivers-2' of https://git.kernel.org/pub/scm/linux/kernel/git...
[muen/linux.git] / drivers / soc / atmel / soc.c
1 /*
2  * Copyright (C) 2015 Atmel
3  *
4  * Alexandre Belloni <alexandre.belloni@free-electrons.com
5  * Boris Brezillon <boris.brezillon@free-electrons.com
6  *
7  * This file is licensed under the terms of the GNU General Public
8  * License version 2.  This program is licensed "as is" without any
9  * warranty of any kind, whether express or implied.
10  *
11  */
12
13 #define pr_fmt(fmt)     "AT91: " fmt
14
15 #include <linux/io.h>
16 #include <linux/of.h>
17 #include <linux/of_address.h>
18 #include <linux/of_platform.h>
19 #include <linux/slab.h>
20 #include <linux/sys_soc.h>
21
22 #include "soc.h"
23
24 #define AT91_DBGU_CIDR                  0x40
25 #define AT91_DBGU_EXID                  0x44
26 #define AT91_CHIPID_CIDR                0x00
27 #define AT91_CHIPID_EXID                0x04
28 #define AT91_CIDR_VERSION(x)            ((x) & 0x1f)
29 #define AT91_CIDR_EXT                   BIT(31)
30 #define AT91_CIDR_MATCH_MASK            0x7fffffe0
31
32 static const struct at91_soc __initconst socs[] = {
33 #ifdef CONFIG_SOC_AT91RM9200
34         AT91_SOC(AT91RM9200_CIDR_MATCH, 0, "at91rm9200 BGA", "at91rm9200"),
35 #endif
36 #ifdef CONFIG_SOC_AT91SAM9
37         AT91_SOC(AT91SAM9260_CIDR_MATCH, 0, "at91sam9260", NULL),
38         AT91_SOC(AT91SAM9261_CIDR_MATCH, 0, "at91sam9261", NULL),
39         AT91_SOC(AT91SAM9263_CIDR_MATCH, 0, "at91sam9263", NULL),
40         AT91_SOC(AT91SAM9G20_CIDR_MATCH, 0, "at91sam9g20", NULL),
41         AT91_SOC(AT91SAM9RL64_CIDR_MATCH, 0, "at91sam9rl64", NULL),
42         AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M11_EXID_MATCH,
43                  "at91sam9m11", "at91sam9g45"),
44         AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M10_EXID_MATCH,
45                  "at91sam9m10", "at91sam9g45"),
46         AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G46_EXID_MATCH,
47                  "at91sam9g46", "at91sam9g45"),
48         AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G45_EXID_MATCH,
49                  "at91sam9g45", "at91sam9g45"),
50         AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G15_EXID_MATCH,
51                  "at91sam9g15", "at91sam9x5"),
52         AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G35_EXID_MATCH,
53                  "at91sam9g35", "at91sam9x5"),
54         AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X35_EXID_MATCH,
55                  "at91sam9x35", "at91sam9x5"),
56         AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G25_EXID_MATCH,
57                  "at91sam9g25", "at91sam9x5"),
58         AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X25_EXID_MATCH,
59                  "at91sam9x25", "at91sam9x5"),
60         AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN12_EXID_MATCH,
61                  "at91sam9cn12", "at91sam9n12"),
62         AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9N12_EXID_MATCH,
63                  "at91sam9n12", "at91sam9n12"),
64         AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN11_EXID_MATCH,
65                  "at91sam9cn11", "at91sam9n12"),
66         AT91_SOC(AT91SAM9XE128_CIDR_MATCH, 0, "at91sam9xe128", "at91sam9xe128"),
67         AT91_SOC(AT91SAM9XE256_CIDR_MATCH, 0, "at91sam9xe256", "at91sam9xe256"),
68         AT91_SOC(AT91SAM9XE512_CIDR_MATCH, 0, "at91sam9xe512", "at91sam9xe512"),
69 #endif
70 #ifdef CONFIG_SOC_SAMA5
71         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D21CU_EXID_MATCH,
72                  "sama5d21", "sama5d2"),
73         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D22CU_EXID_MATCH,
74                  "sama5d22", "sama5d2"),
75         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D225C_D1M_EXID_MATCH,
76                  "sama5d225c 16MiB SiP", "sama5d2"),
77         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D23CU_EXID_MATCH,
78                  "sama5d23", "sama5d2"),
79         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CX_EXID_MATCH,
80                  "sama5d24", "sama5d2"),
81         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CU_EXID_MATCH,
82                  "sama5d24", "sama5d2"),
83         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D26CU_EXID_MATCH,
84                  "sama5d26", "sama5d2"),
85         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CU_EXID_MATCH,
86                  "sama5d27", "sama5d2"),
87         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CN_EXID_MATCH,
88                  "sama5d27", "sama5d2"),
89         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27C_D1G_EXID_MATCH,
90                  "sama5d27c 128MiB SiP", "sama5d2"),
91         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27C_D5M_EXID_MATCH,
92                  "sama5d27c 64MiB SiP", "sama5d2"),
93         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CU_EXID_MATCH,
94                  "sama5d28", "sama5d2"),
95         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CN_EXID_MATCH,
96                  "sama5d28", "sama5d2"),
97         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28C_D1G_EXID_MATCH,
98                  "sama5d28c 128MiB SiP", "sama5d2"),
99         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D31_EXID_MATCH,
100                  "sama5d31", "sama5d3"),
101         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D33_EXID_MATCH,
102                  "sama5d33", "sama5d3"),
103         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D34_EXID_MATCH,
104                  "sama5d34", "sama5d3"),
105         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D35_EXID_MATCH,
106                  "sama5d35", "sama5d3"),
107         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D36_EXID_MATCH,
108                  "sama5d36", "sama5d3"),
109         AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D41_EXID_MATCH,
110                  "sama5d41", "sama5d4"),
111         AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D42_EXID_MATCH,
112                  "sama5d42", "sama5d4"),
113         AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D43_EXID_MATCH,
114                  "sama5d43", "sama5d4"),
115         AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D44_EXID_MATCH,
116                  "sama5d44", "sama5d4"),
117 #endif
118 #ifdef CONFIG_SOC_SAMV7
119         AT91_SOC(SAME70Q21_CIDR_MATCH, SAME70Q21_EXID_MATCH,
120                  "same70q21", "same7"),
121         AT91_SOC(SAME70Q20_CIDR_MATCH, SAME70Q20_EXID_MATCH,
122                  "same70q20", "same7"),
123         AT91_SOC(SAME70Q19_CIDR_MATCH, SAME70Q19_EXID_MATCH,
124                  "same70q19", "same7"),
125         AT91_SOC(SAMS70Q21_CIDR_MATCH, SAMS70Q21_EXID_MATCH,
126                  "sams70q21", "sams7"),
127         AT91_SOC(SAMS70Q20_CIDR_MATCH, SAMS70Q20_EXID_MATCH,
128                  "sams70q20", "sams7"),
129         AT91_SOC(SAMS70Q19_CIDR_MATCH, SAMS70Q19_EXID_MATCH,
130                  "sams70q19", "sams7"),
131         AT91_SOC(SAMV71Q21_CIDR_MATCH, SAMV71Q21_EXID_MATCH,
132                  "samv71q21", "samv7"),
133         AT91_SOC(SAMV71Q20_CIDR_MATCH, SAMV71Q20_EXID_MATCH,
134                  "samv71q20", "samv7"),
135         AT91_SOC(SAMV71Q19_CIDR_MATCH, SAMV71Q19_EXID_MATCH,
136                  "samv71q19", "samv7"),
137         AT91_SOC(SAMV70Q20_CIDR_MATCH, SAMV70Q20_EXID_MATCH,
138                  "samv70q20", "samv7"),
139         AT91_SOC(SAMV70Q19_CIDR_MATCH, SAMV70Q19_EXID_MATCH,
140                  "samv70q19", "samv7"),
141 #endif
142         { /* sentinel */ },
143 };
144
145 static int __init at91_get_cidr_exid_from_dbgu(u32 *cidr, u32 *exid)
146 {
147         struct device_node *np;
148         void __iomem *regs;
149
150         np = of_find_compatible_node(NULL, NULL, "atmel,at91rm9200-dbgu");
151         if (!np)
152                 np = of_find_compatible_node(NULL, NULL,
153                                              "atmel,at91sam9260-dbgu");
154         if (!np)
155                 return -ENODEV;
156
157         regs = of_iomap(np, 0);
158         of_node_put(np);
159
160         if (!regs) {
161                 pr_warn("Could not map DBGU iomem range");
162                 return -ENXIO;
163         }
164
165         *cidr = readl(regs + AT91_DBGU_CIDR);
166         *exid = readl(regs + AT91_DBGU_EXID);
167
168         iounmap(regs);
169
170         return 0;
171 }
172
173 static int __init at91_get_cidr_exid_from_chipid(u32 *cidr, u32 *exid)
174 {
175         struct device_node *np;
176         void __iomem *regs;
177
178         np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-chipid");
179         if (!np)
180                 return -ENODEV;
181
182         regs = of_iomap(np, 0);
183         of_node_put(np);
184
185         if (!regs) {
186                 pr_warn("Could not map DBGU iomem range");
187                 return -ENXIO;
188         }
189
190         *cidr = readl(regs + AT91_CHIPID_CIDR);
191         *exid = readl(regs + AT91_CHIPID_EXID);
192
193         iounmap(regs);
194
195         return 0;
196 }
197
198 struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
199 {
200         struct soc_device_attribute *soc_dev_attr;
201         const struct at91_soc *soc;
202         struct soc_device *soc_dev;
203         u32 cidr, exid;
204         int ret;
205
206         /*
207          * With SAMA5D2 and later SoCs, CIDR and EXID registers are no more
208          * in the dbgu device but in the chipid device whose purpose is only
209          * to expose these two registers.
210          */
211         ret = at91_get_cidr_exid_from_dbgu(&cidr, &exid);
212         if (ret)
213                 ret = at91_get_cidr_exid_from_chipid(&cidr, &exid);
214         if (ret) {
215                 if (ret == -ENODEV)
216                         pr_warn("Could not find identification node");
217                 return NULL;
218         }
219
220         for (soc = socs; soc->name; soc++) {
221                 if (soc->cidr_match != (cidr & AT91_CIDR_MATCH_MASK))
222                         continue;
223
224                 if (!(cidr & AT91_CIDR_EXT) || soc->exid_match == exid)
225                         break;
226         }
227
228         if (!soc->name) {
229                 pr_warn("Could not find matching SoC description\n");
230                 return NULL;
231         }
232
233         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
234         if (!soc_dev_attr)
235                 return NULL;
236
237         soc_dev_attr->family = soc->family;
238         soc_dev_attr->soc_id = soc->name;
239         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%X",
240                                            AT91_CIDR_VERSION(cidr));
241         soc_dev = soc_device_register(soc_dev_attr);
242         if (IS_ERR(soc_dev)) {
243                 kfree(soc_dev_attr->revision);
244                 kfree(soc_dev_attr);
245                 pr_warn("Could not register SoC device\n");
246                 return NULL;
247         }
248
249         if (soc->family)
250                 pr_info("Detected SoC family: %s\n", soc->family);
251         pr_info("Detected SoC: %s, revision %X\n", soc->name,
252                 AT91_CIDR_VERSION(cidr));
253
254         return soc_dev;
255 }
256
257 static int __init atmel_soc_device_init(void)
258 {
259         at91_soc_init(socs);
260
261         return 0;
262 }
263 subsys_initcall(atmel_soc_device_init);