2 * Copyright (C) 2015 Atmel
4 * Alexandre Belloni <alexandre.belloni@free-electrons.com
5 * Boris Brezillon <boris.brezillon@free-electrons.com
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.
13 #define pr_fmt(fmt) "AT91: " fmt
17 #include <linux/of_address.h>
18 #include <linux/of_platform.h>
19 #include <linux/slab.h>
20 #include <linux/sys_soc.h>
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
32 static int __init at91_get_cidr_exid_from_dbgu(u32 *cidr, u32 *exid)
34 struct device_node *np;
37 np = of_find_compatible_node(NULL, NULL, "atmel,at91rm9200-dbgu");
39 np = of_find_compatible_node(NULL, NULL,
40 "atmel,at91sam9260-dbgu");
44 regs = of_iomap(np, 0);
48 pr_warn("Could not map DBGU iomem range");
52 *cidr = readl(regs + AT91_DBGU_CIDR);
53 *exid = readl(regs + AT91_DBGU_EXID);
60 static int __init at91_get_cidr_exid_from_chipid(u32 *cidr, u32 *exid)
62 struct device_node *np;
65 np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-chipid");
69 regs = of_iomap(np, 0);
73 pr_warn("Could not map DBGU iomem range");
77 *cidr = readl(regs + AT91_CHIPID_CIDR);
78 *exid = readl(regs + AT91_CHIPID_EXID);
85 struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
87 struct soc_device_attribute *soc_dev_attr;
88 const struct at91_soc *soc;
89 struct soc_device *soc_dev;
94 * With SAMA5D2 and later SoCs, CIDR and EXID registers are no more
95 * in the dbgu device but in the chipid device whose purpose is only
96 * to expose these two registers.
98 ret = at91_get_cidr_exid_from_dbgu(&cidr, &exid);
100 ret = at91_get_cidr_exid_from_chipid(&cidr, &exid);
103 pr_warn("Could not find identification node");
107 for (soc = socs; soc->name; soc++) {
108 if (soc->cidr_match != (cidr & AT91_CIDR_MATCH_MASK))
111 if (!(cidr & AT91_CIDR_EXT) || soc->exid_match == exid)
116 pr_warn("Could not find matching SoC description\n");
120 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
124 soc_dev_attr->family = soc->family;
125 soc_dev_attr->soc_id = soc->name;
126 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%X",
127 AT91_CIDR_VERSION(cidr));
128 soc_dev = soc_device_register(soc_dev_attr);
129 if (IS_ERR(soc_dev)) {
130 kfree(soc_dev_attr->revision);
132 pr_warn("Could not register SoC device\n");
137 pr_info("Detected SoC family: %s\n", soc->family);
138 pr_info("Detected SoC: %s, revision %X\n", soc->name,
139 AT91_CIDR_VERSION(cidr));