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ARM: OMAP2+: Export SoC information to userspace

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In some situations it is useful for userspace to
know some SoC-specific information. For example,
this may be used for deciding what kernel module to
use or how to better configure some settings etc.
This patch exports OMAP SoC information to userspace
using existing in Linux kernel SoC infrastructure.

This information can be read under
/sys/devices/socX directory

Signed-off-by: Ruslan Bilovol <ruslan.bilovol@ti.com>
[tony@atomide.com: updated for multiplatform changes]
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Ruslan Bilovol 2013-02-14 13:55:24 +02:00 committed by Tony Lindgren
parent f9d41eefcf
commit 6770b21143
4 changed files with 75 additions and 0 deletions
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1
arch/arm/mach-omap2/Kconfig
View File

@ -15,6 +15,7 @@ config ARCH_OMAP2PLUS
select OMAP_DM_TIMER
select PINCTRL
select PROC_DEVICETREE if PROC_FS
select SOC_BUS
select SPARSE_IRQ
select USE_OF
help

8
arch/arm/mach-omap2/common.h
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@ -110,6 +110,14 @@ void am35xx_init_late(void);
void ti81xx_init_late(void);
int omap2_common_pm_late_init(void);
#ifdef CONFIG_SOC_BUS
void omap_soc_device_init(void);
#else
static inline void omap_soc_device_init(void)
{
}
#endif
#if defined(CONFIG_SOC_OMAP2420) || defined(CONFIG_SOC_OMAP2430)
void omap2xxx_restart(char mode, const char *cmd);
#else

65
arch/arm/mach-omap2/id.c
View File

@ -18,6 +18,11 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/slab.h>
#ifdef CONFIG_SOC_BUS
#include <linux/sys_soc.h>
#endif
#include <asm/cputype.h>
@ -583,3 +588,63 @@ void __init omap2_set_globals_tap(u32 class, void __iomem *tap)
else
tap_prod_id = 0x0208;
}
#ifdef CONFIG_SOC_BUS
static const char const *omap_types[] = {
[OMAP2_DEVICE_TYPE_TEST] = "TST",
[OMAP2_DEVICE_TYPE_EMU] = "EMU",
[OMAP2_DEVICE_TYPE_SEC] = "HS",
[OMAP2_DEVICE_TYPE_GP] = "GP",
[OMAP2_DEVICE_TYPE_BAD] = "BAD",
};
static const char * __init omap_get_family(void)
{
if (cpu_is_omap24xx())
return kasprintf(GFP_KERNEL, "OMAP2");
else if (cpu_is_omap34xx())
return kasprintf(GFP_KERNEL, "OMAP3");
else if (cpu_is_omap44xx())
return kasprintf(GFP_KERNEL, "OMAP4");
else if (soc_is_omap54xx())
return kasprintf(GFP_KERNEL, "OMAP5");
else
return kasprintf(GFP_KERNEL, "Unknown");
}
static ssize_t omap_get_type(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%s\n", omap_types[omap_type()]);
}
static struct device_attribute omap_soc_attr =
__ATTR(type, S_IRUGO, omap_get_type, NULL);
void __init omap_soc_device_init(void)
{
struct device *parent;
struct soc_device *soc_dev;
struct soc_device_attribute *soc_dev_attr;
soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
if (!soc_dev_attr)
return;
soc_dev_attr->machine = soc_name;
soc_dev_attr->family = omap_get_family();
soc_dev_attr->revision = soc_rev;
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR_OR_NULL(soc_dev)) {
kfree(soc_dev_attr);
return;
}
parent = soc_device_to_device(soc_dev);
if (!IS_ERR_OR_NULL(parent))
device_create_file(parent, &omap_soc_attr);
}
#endif /* CONFIG_SOC_BUS */

1
arch/arm/mach-omap2/io.c
View File

@ -389,6 +389,7 @@ static void __init omap_common_late_init(void)
{
omap_mux_late_init();
omap2_common_pm_late_init();
omap_soc_device_init();
}
#ifdef CONFIG_SOC_OMAP2420