1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2014 Linaro Ltd.
5 * Author: Linus Walleij <linus.walleij@linaro.org>
7 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/sys_soc.h>
11 #include <linux/platform_device.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/regmap.h>
16 #define INTEGRATOR_HDR_ID_OFFSET 0x00
18 static u32 integrator_coreid
;
20 static const struct of_device_id integrator_cm_match
[] = {
21 { .compatible
= "arm,core-module-integrator", },
25 static const char *integrator_arch_str(u32 id
)
27 switch ((id
>> 16) & 0xff) {
29 return "ASB little-endian";
31 return "AHB little-endian";
33 return "AHB-Lite system bus, bi-endian";
37 return "AHB system bus, ASB processor bus";
43 static const char *integrator_fpga_str(u32 id
)
45 switch ((id
>> 12) & 0xf) {
53 return "EPM7256AE (Altera PLD)";
60 manufacturer_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
62 return sprintf(buf
, "%02x\n", integrator_coreid
>> 24);
65 static DEVICE_ATTR_RO(manufacturer
);
68 arch_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
70 return sprintf(buf
, "%s\n", integrator_arch_str(integrator_coreid
));
73 static DEVICE_ATTR_RO(arch
);
76 fpga_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
78 return sprintf(buf
, "%s\n", integrator_fpga_str(integrator_coreid
));
81 static DEVICE_ATTR_RO(fpga
);
84 build_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
86 return sprintf(buf
, "%02x\n", (integrator_coreid
>> 4) & 0xFF);
89 static DEVICE_ATTR_RO(build
);
91 static struct attribute
*integrator_attrs
[] = {
92 &dev_attr_manufacturer
.attr
,
99 ATTRIBUTE_GROUPS(integrator
);
101 static int __init
integrator_soc_init(void)
103 struct regmap
*syscon_regmap
;
104 struct soc_device
*soc_dev
;
105 struct soc_device_attribute
*soc_dev_attr
;
106 struct device_node
*np
;
111 np
= of_find_matching_node(NULL
, integrator_cm_match
);
115 syscon_regmap
= syscon_node_to_regmap(np
);
116 if (IS_ERR(syscon_regmap
))
117 return PTR_ERR(syscon_regmap
);
119 ret
= regmap_read(syscon_regmap
, INTEGRATOR_HDR_ID_OFFSET
,
123 integrator_coreid
= val
;
125 soc_dev_attr
= kzalloc(sizeof(*soc_dev_attr
), GFP_KERNEL
);
129 soc_dev_attr
->soc_id
= "Integrator";
130 soc_dev_attr
->machine
= "Integrator";
131 soc_dev_attr
->family
= "Versatile";
132 soc_dev_attr
->custom_attr_group
= integrator_groups
[0];
133 soc_dev
= soc_device_register(soc_dev_attr
);
134 if (IS_ERR(soc_dev
)) {
138 dev
= soc_device_to_device(soc_dev
);
140 dev_info(dev
, "Detected ARM core module:\n");
141 dev_info(dev
, " Manufacturer: %02x\n", (val
>> 24));
142 dev_info(dev
, " Architecture: %s\n", integrator_arch_str(val
));
143 dev_info(dev
, " FPGA: %s\n", integrator_fpga_str(val
));
144 dev_info(dev
, " Build: %02x\n", (val
>> 4) & 0xFF);
145 dev_info(dev
, " Rev: %c\n", ('A' + (val
& 0x03)));
149 device_initcall(integrator_soc_init
);