mirror of https://gitee.com/openkylin/linux.git
98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2015 Atmel
|
||
|
|
*
|
||
|
|
* Alexandre Belloni <alexandre.belloni@free-electrons.com
|
||
|
|
* Boris Brezillon <boris.brezillon@free-electrons.com
|
||
|
|
*
|
||
|
|
* 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,
|
||
|
|
"atmel,at91sam9260-dbgu");
|
||
|
|
|
||
|
|
if (!np) {
|
||
|
|
pr_warn("Could not find DBGU node");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
regs = of_iomap(np, 0);
|
||
|
|
of_node_put(np);
|
||
|
|
|
||
|
|
if (!regs) {
|
||
|
|
pr_warn("Could not map DBGU iomem range");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
cidr = readl(regs + AT91_DBGU_CIDR);
|
||
|
|
exid = readl(regs + AT91_DBGU_EXID);
|
||
|
|
|
||
|
|
iounmap(regs);
|
||
|
|
|
||
|
|
for (soc = socs; soc->name; soc++) {
|
||
|
|
if (soc->cidr_match != (cidr & AT91_DBGU_CIDR_MATCH_MASK))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
if (!(cidr & AT91_DBGU_CIDR_EXT) || soc->exid_match == exid)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
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",
|
||
|
|
AT91_DBGU_CIDR_VERSION(cidr));
|
||
|
|
soc_dev = soc_device_register(soc_dev_attr);
|
||
|
|
if (IS_ERR(soc_dev)) {
|
||
|
|
kfree(soc_dev_attr->revision);
|
||
|
|
kfree(soc_dev_attr);
|
||
|
|
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,
|
||
|
|
AT91_DBGU_CIDR_VERSION(cidr));
|
||
|
|
|
||
|
|
return soc_dev;
|
||
|
|
}
|