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ARM: at91: use chipid device for soc detection

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So far, the CIDR and EXID registers were in the DBGU interface. This device
has disappeared with the SAMA5D2 family. These registers are exposed
through a new device called chipid.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
[nicolas.ferre@atmel.com: remove useless warnings]
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Rob Herring <robh@kernel.org>
[arnd@arndb.de: suggest to use static functions to reduce scope]
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Ludovic Desroches 2016-03-18 08:21:19 +01:00 committed by Nicolas Ferre
parent f55532a0c0
commit 2f26e6189d
2 changed files with 69 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/devicetree/bindings/arm/atmel-at91.txt
View File

@ -41,6 +41,10 @@ compatible: must be one of:
- "atmel,sama5d43"
- "atmel,sama5d44"
Chipid required properties:
- compatible: Should be "atmel,sama5d2-chipid"
- reg : Should contain registers location and length
PIT Timer required properties:
- compatible: Should be "atmel,at91sam9260-pit"
- reg: Should contain registers location and length

85
arch/arm/mach-at91/soc.c
View File

@ -22,48 +22,93 @@
#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
#define AT91_CHIPID_CIDR 0x00
#define AT91_CHIPID_EXID 0x04
#define AT91_CIDR_VERSION(x) ((x) & 0x1f)
#define AT91_CIDR_EXT BIT(31)
#define AT91_CIDR_MATCH_MASK 0x7fffffe0
struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
static int __init at91_get_cidr_exid_from_dbgu(u32 *cidr, u32 *exid)
{
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;
}
if (!np)
return -ENODEV;
regs = of_iomap(np, 0);
of_node_put(np);
if (!regs) {
pr_warn("Could not map DBGU iomem range");
return NULL;
return -ENXIO;
}
cidr = readl(regs + AT91_DBGU_CIDR);
exid = readl(regs + AT91_DBGU_EXID);
*cidr = readl(regs + AT91_DBGU_CIDR);
*exid = readl(regs + AT91_DBGU_EXID);
iounmap(regs);
return 0;
}
static int __init at91_get_cidr_exid_from_chipid(u32 *cidr, u32 *exid)
{
struct device_node *np;
void __iomem *regs;
np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-chipid");
if (!np)
return -ENODEV;
regs = of_iomap(np, 0);
of_node_put(np);
if (!regs) {
pr_warn("Could not map DBGU iomem range");
return -ENXIO;
}
*cidr = readl(regs + AT91_CHIPID_CIDR);
*exid = readl(regs + AT91_CHIPID_EXID);
iounmap(regs);
return 0;
}
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;
u32 cidr, exid;
int ret;
/*
* With SAMA5D2 and later SoCs, CIDR and EXID registers are no more
* in the dbgu device but in the chipid device whose purpose is only
* to expose these two registers.
*/
ret = at91_get_cidr_exid_from_dbgu(&cidr, &exid);
if (ret)
ret = at91_get_cidr_exid_from_chipid(&cidr, &exid);
if (ret) {
if (ret == -ENODEV)
pr_warn("Could not find identification node");
return NULL;
}
for (soc = socs; soc->name; soc++) {
if (soc->cidr_match != (cidr & AT91_DBGU_CIDR_MATCH_MASK))
if (soc->cidr_match != (cidr & AT91_CIDR_MATCH_MASK))
continue;
if (!(cidr & AT91_DBGU_CIDR_EXT) || soc->exid_match == exid)
if (!(cidr & AT91_CIDR_EXT) || soc->exid_match == exid)
break;
}
@ -79,7 +124,7 @@ struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
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));
AT91_CIDR_VERSION(cidr));
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
kfree(soc_dev_attr->revision);
@ -91,7 +136,7 @@ struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
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));
AT91_CIDR_VERSION(cidr));
return soc_dev;
}