blob: 54343ffa3e53352ba142c7ed1894f00f37193bc3 [file] [log] [blame]
* Copyright (C) 2015 Atmel
* Alexandre Belloni <
* Boris Brezillon <
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
#define pr_fmt(fmt) "AT91: " fmt
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include "soc.h"
#define AT91_DBGU_CIDR 0x40
#define AT91_DBGU_CIDR_VERSION(x) ((x) & 0x1f)
#define AT91_DBGU_CIDR_EXT BIT(31)
#define AT91_DBGU_CIDR_MATCH_MASK 0x7fffffe0
#define AT91_DBGU_EXID 0x44
struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
struct soc_device_attribute *soc_dev_attr;
const struct at91_soc *soc;
struct soc_device *soc_dev;
struct device_node *np;
void __iomem *regs;
u32 cidr, exid;
np = of_find_compatible_node(NULL, NULL, "atmel,at91rm9200-dbgu");
if (!np)
np = of_find_compatible_node(NULL, NULL,
if (!np) {
pr_warn("Could not find DBGU node");
return NULL;
regs = of_iomap(np, 0);
if (!regs) {
pr_warn("Could not map DBGU iomem range");
return NULL;
cidr = readl(regs + AT91_DBGU_CIDR);
exid = readl(regs + AT91_DBGU_EXID);
for (soc = socs; soc->name; soc++) {
if (soc->cidr_match != (cidr & AT91_DBGU_CIDR_MATCH_MASK))
if (!(cidr & AT91_DBGU_CIDR_EXT) || soc->exid_match == exid)
if (!soc->name) {
pr_warn("Could not find matching SoC description\n");
return NULL;
soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
if (!soc_dev_attr)
return NULL;
soc_dev_attr->family = soc->family;
soc_dev_attr->soc_id = soc->name;
soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%X",
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
pr_warn("Could not register SoC device\n");
return NULL;
if (soc->family)
pr_info("Detected SoC family: %s\n", soc->family);
pr_info("Detected SoC: %s, revision %X\n", soc->name,
return soc_dev;