Commit 6770b211 authored by Ruslan Bilovol's avatar Ruslan Bilovol Committed by Tony Lindgren
Browse files

ARM: OMAP2+: Export SoC information to userspace 



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: default avatarRuslan Bilovol <ruslan.bilovol@ti.com>
[tony@atomide.com: updated for multiplatform changes]
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent f9d41eef

arch/arm/mach-omap2/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/mach-omap2/common.h

+8 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/mach-omap2/id.c

+65 −0
Original line number Diff line number Diff line
@@ -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 */

arch/arm/mach-omap2/io.c

+1 −0
Original line number Diff line number Diff line
@@ -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

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