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-rw-r--r--drivers/soc/atmel/soc.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/drivers/soc/atmel/soc.c b/drivers/soc/atmel/soc.c
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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
32static 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, SAMA5D23CU_EXID_MATCH,
76 "sama5d23", "sama5d2"),
77 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CX_EXID_MATCH,
78 "sama5d24", "sama5d2"),
79 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CU_EXID_MATCH,
80 "sama5d24", "sama5d2"),
81 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D26CU_EXID_MATCH,
82 "sama5d26", "sama5d2"),
83 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CU_EXID_MATCH,
84 "sama5d27", "sama5d2"),
85 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CN_EXID_MATCH,
86 "sama5d27", "sama5d2"),
87 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CU_EXID_MATCH,
88 "sama5d28", "sama5d2"),
89 AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CN_EXID_MATCH,
90 "sama5d28", "sama5d2"),
91 AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D31_EXID_MATCH,
92 "sama5d31", "sama5d3"),
93 AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D33_EXID_MATCH,
94 "sama5d33", "sama5d3"),
95 AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D34_EXID_MATCH,
96 "sama5d34", "sama5d3"),
97 AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D35_EXID_MATCH,
98 "sama5d35", "sama5d3"),
99 AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D36_EXID_MATCH,
100 "sama5d36", "sama5d3"),
101 AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D41_EXID_MATCH,
102 "sama5d41", "sama5d4"),
103 AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D42_EXID_MATCH,
104 "sama5d42", "sama5d4"),
105 AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D43_EXID_MATCH,
106 "sama5d43", "sama5d4"),
107 AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D44_EXID_MATCH,
108 "sama5d44", "sama5d4"),
109#endif
110 { /* sentinel */ },
111};
112
113static int __init at91_get_cidr_exid_from_dbgu(u32 *cidr, u32 *exid)
114{
115 struct device_node *np;
116 void __iomem *regs;
117
118 np = of_find_compatible_node(NULL, NULL, "atmel,at91rm9200-dbgu");
119 if (!np)
120 np = of_find_compatible_node(NULL, NULL,
121 "atmel,at91sam9260-dbgu");
122 if (!np)
123 return -ENODEV;
124
125 regs = of_iomap(np, 0);
126 of_node_put(np);
127
128 if (!regs) {
129 pr_warn("Could not map DBGU iomem range");
130 return -ENXIO;
131 }
132
133 *cidr = readl(regs + AT91_DBGU_CIDR);
134 *exid = readl(regs + AT91_DBGU_EXID);
135
136 iounmap(regs);
137
138 return 0;
139}
140
141static int __init at91_get_cidr_exid_from_chipid(u32 *cidr, u32 *exid)
142{
143 struct device_node *np;
144 void __iomem *regs;
145
146 np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-chipid");
147 if (!np)
148 return -ENODEV;
149
150 regs = of_iomap(np, 0);
151 of_node_put(np);
152
153 if (!regs) {
154 pr_warn("Could not map DBGU iomem range");
155 return -ENXIO;
156 }
157
158 *cidr = readl(regs + AT91_CHIPID_CIDR);
159 *exid = readl(regs + AT91_CHIPID_EXID);
160
161 iounmap(regs);
162
163 return 0;
164}
165
166struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
167{
168 struct soc_device_attribute *soc_dev_attr;
169 const struct at91_soc *soc;
170 struct soc_device *soc_dev;
171 u32 cidr, exid;
172 int ret;
173
174 /*
175 * With SAMA5D2 and later SoCs, CIDR and EXID registers are no more
176 * in the dbgu device but in the chipid device whose purpose is only
177 * to expose these two registers.
178 */
179 ret = at91_get_cidr_exid_from_dbgu(&cidr, &exid);
180 if (ret)
181 ret = at91_get_cidr_exid_from_chipid(&cidr, &exid);
182 if (ret) {
183 if (ret == -ENODEV)
184 pr_warn("Could not find identification node");
185 return NULL;
186 }
187
188 for (soc = socs; soc->name; soc++) {
189 if (soc->cidr_match != (cidr & AT91_CIDR_MATCH_MASK))
190 continue;
191
192 if (!(cidr & AT91_CIDR_EXT) || soc->exid_match == exid)
193 break;
194 }
195
196 if (!soc->name) {
197 pr_warn("Could not find matching SoC description\n");
198 return NULL;
199 }
200
201 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
202 if (!soc_dev_attr)
203 return NULL;
204
205 soc_dev_attr->family = soc->family;
206 soc_dev_attr->soc_id = soc->name;
207 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%X",
208 AT91_CIDR_VERSION(cidr));
209 soc_dev = soc_device_register(soc_dev_attr);
210 if (IS_ERR(soc_dev)) {
211 kfree(soc_dev_attr->revision);
212 kfree(soc_dev_attr);
213 pr_warn("Could not register SoC device\n");
214 return NULL;
215 }
216
217 if (soc->family)
218 pr_info("Detected SoC family: %s\n", soc->family);
219 pr_info("Detected SoC: %s, revision %X\n", soc->name,
220 AT91_CIDR_VERSION(cidr));
221
222 return soc_dev;
223}
224
225static int __init atmel_soc_device_init(void)
226{
227 at91_soc_init(socs);
228
229 return 0;
230}
231subsys_initcall(atmel_soc_device_init);
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