Commit ea4abe7f authored by Boris BREZILLON's avatar Boris BREZILLON Committed by Nicolas Ferre

ARM: at91: add soc detection infrastructure

Add new structures and functions to handle AT91 SoC detection.

[alexandre.belloni@free-electrons.com: reworked DBGU detection]
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: default avatarBoris BREZILLON <boris.brezillon@free-electrons.com>
Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
parent 8c07f664
......@@ -363,6 +363,7 @@ config ARCH_AT91
select IRQ_DOMAIN
select PINCTRL
select PINCTRL_AT91
select SOC_BUS
select USE_OF
help
This enables support for systems based on Atmel
......
......@@ -2,7 +2,7 @@
# Makefile for the linux kernel.
#
obj-y := setup.o
obj-y := setup.o soc.o
obj-$(CONFIG_SOC_AT91SAM9) += sam9_smc.o
......
/*
* 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;
}
/*
* Copyright (C) 2015 Atmel
*
* 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.
*
*/
#ifndef __AT91_SOC_H
#define __AT91_SOC_H
#include <linux/sys_soc.h>
struct at91_soc {
u32 cidr_match;
u32 exid_match;
const char *name;
const char *family;
};
#define AT91_SOC(__cidr, __exid, __name, __family) \
{ \
.cidr_match = (__cidr), \
.exid_match = (__exid), \
.name = (__name), \
.family = (__family), \
}
struct soc_device * __init
at91_soc_init(const struct at91_soc *socs);
#endif /* __AT91_SOC_H */
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