[PATCH v3 0/2] ARM: OMAP2+: Export SoC information to userspace using SoC infrastructure

[PATCH v3 0/2] ARM: OMAP2+: Export SoC information to userspace using SoC infrastructure

[Ruslan Bilovol]

Hi,

This patch series is an attempt to export some OMAP SoC
information (like name, revision etc.) to userspace.
The first patch does some unification of OMAP SoC
information representation in current sources.
Second patch adds exactly needed changes using
exists in Linux kernel SoC infrastructure.

-----------------------------------------
v3:
- reduced number of lines changed in the first patch (reusing
  existent code)

-----------------------------------------
v2:
- changed cpu_* -> soc_* variable names
- rebased on top of 'omap-for-v3.9/soc' branch of tmlind/linux-omap tree


Ruslan Bilovol (2):
  ARM: OMAP2+: SoC name and revision unification
  ARM: OMAP2+: Export SoC information to userspace

 arch/arm/mach-omap2/common.h |    8 ++++
 arch/arm/mach-omap2/id.c     |   95 ++++++++++++++++++++++++++++++++++++++----
 arch/arm/mach-omap2/io.c     |    1 +
 arch/arm/plat-omap/Kconfig   |    1 +
 4 files changed, 97 insertions(+), 8 deletions(-)

-- 
1.7.9.5

[PATCH v3 1/2] ARM: OMAP2+: SoC name and revision unification

[Ruslan Bilovol]

This is a long story where for each new generation of
OMAP we used different approaches for creating
strings for SoCs names and revisions that this patch
fixes. It makes future exporting of this information
to SoC infrastructure easier.

Signed-off-by: Ruslan Bilovol <ruslan.bilovol@ti.com>
---
 arch/arm/mach-omap2/id.c |   30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index 8a68f1e..3737700 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -31,8 +31,11 @@
 #define OMAP4_SILICON_TYPE_STANDARD		0x01
 #define OMAP4_SILICON_TYPE_PERFORMANCE		0x02
 
+#define OMAP_SOC_MAX_NAME_LENGTH		16
+
 static unsigned int omap_revision;
-static const char *cpu_rev;
+static char soc_name[OMAP_SOC_MAX_NAME_LENGTH];
+static char soc_rev[OMAP_SOC_MAX_NAME_LENGTH];
 u32 omap_features;
 
 unsigned int omap_rev(void)
@@ -169,9 +172,12 @@ void __init omap2xxx_check_revision(void)
 		j = i;
 	}
 
-	pr_info("OMAP%04x", omap_rev() >> 16);
+	sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
+	sprintf(soc_rev, "ES%x", (omap_rev() >> 12) & 0xf);
+
+	pr_info("%s", soc_name);
 	if ((omap_rev() >> 8) & 0x0f)
-		pr_info("ES%x", (omap_rev() >> 12) & 0xf);
+		pr_info("%s", soc_rev);
 	pr_info("\n");
 }
 
@@ -211,8 +217,10 @@ static void __init omap3_cpuinfo(void)
 		cpu_name = "OMAP3503";
 	}
 
+	sprintf(soc_name, "%s", cpu_name);
+
 	/* Print verbose information */
-	pr_info("%s ES%s (", cpu_name, cpu_rev);
+	pr_info("%s %s (", soc_name, soc_rev);
 
 	OMAP3_SHOW_FEATURE(l2cache);
 	OMAP3_SHOW_FEATURE(iva);
@@ -291,6 +299,7 @@ void __init ti81xx_check_features(void)
 
 void __init omap3xxx_check_revision(void)
 {
+	const char *cpu_rev;
 	u32 cpuid, idcode;
 	u16 hawkeye;
 	u8 rev;
@@ -438,6 +447,7 @@ void __init omap3xxx_check_revision(void)
 		cpu_rev = "1.2";
 		pr_warn("Warning: unknown chip type; assuming OMAP3630ES1.2\n");
 	}
+	sprintf(soc_rev, "ES%s", cpu_rev);
 }
 
 void __init omap4xxx_check_revision(void)
@@ -512,8 +522,10 @@ void __init omap4xxx_check_revision(void)
 		omap_revision = OMAP4430_REV_ES2_3;
 	}
 
-	pr_info("OMAP%04x ES%d.%d\n", omap_rev() >> 16,
-		((omap_rev() >> 12) & 0xf), ((omap_rev() >> 8) & 0xf));
+	sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
+	sprintf(soc_rev, "ES%d.%d", (omap_rev() >> 12) & 0xf,
+						(omap_rev() >> 8) & 0xf);
+	pr_info("%s %s\n", soc_name, soc_rev);
 }
 
 void __init omap5xxx_check_revision(void)
@@ -547,8 +559,10 @@ void __init omap5xxx_check_revision(void)
 		omap_revision = OMAP5430_REV_ES1_0;
 	}
 
-	pr_info("OMAP%04x ES%d.0\n",
-			omap_rev() >> 16, ((omap_rev() >> 12) & 0xf));
+	sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
+	sprintf(soc_rev, "ES%d.0", (omap_rev() >> 12) & 0xf);
+
+	pr_info("%s %s\n", soc_name, soc_rev);
 }
 
 /*
-- 
1.7.9.5

[PATCH v3 2/2] ARM: OMAP2+: Export SoC information to userspace

[Ruslan Bilovol]

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>
---
 arch/arm/mach-omap2/common.h |    8 ++++++
 arch/arm/mach-omap2/id.c     |   65 ++++++++++++++++++++++++++++++++++++++++++
 arch/arm/mach-omap2/io.c     |    1 +
 arch/arm/plat-omap/Kconfig   |    1 +
 4 files changed, 75 insertions(+)

diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index 0c3a991..a024084 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -111,6 +111,14 @@ void ti81xx_init_late(void);
 void omap4430_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
diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index 3737700..098e94e 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -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 */
diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c
index 2c3fdd6..08003c1 100644
--- a/arch/arm/mach-omap2/io.c
+++ b/arch/arm/mach-omap2/io.c
@@ -602,6 +602,7 @@ void __init omap4430_init_late(void)
 	omap2_common_pm_late_init();
 	omap4_pm_init();
 	omap2_clk_enable_autoidle_all();
+	omap_soc_device_init();
 }
 #endif
 
diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig
index 1fbac36..24b5687 100644
--- a/arch/arm/plat-omap/Kconfig
+++ b/arch/arm/plat-omap/Kconfig
@@ -30,6 +30,7 @@ config ARCH_OMAP2PLUS
 	select PROC_DEVICETREE if PROC_FS
 	select SPARSE_IRQ
 	select USE_OF
+	select SOC_BUS
 	help
 	  "Systems based on OMAP2, OMAP3, OMAP4 or OMAP5"
 
-- 
1.7.9.5

Re: [PATCH v3 2/2] ARM: OMAP2+: Export SoC information to userspace

[Tony Lindgren]

* Ruslan Bilovol <ruslan.bilovol@ti.com> [130206 14:54]:
> --- a/arch/arm/mach-omap2/io.c
> +++ b/arch/arm/mach-omap2/io.c
> @@ -602,6 +602,7 @@ void __init omap4430_init_late(void)
>  	omap2_common_pm_late_init();
>  	omap4_pm_init();
>  	omap2_clk_enable_autoidle_all();
> +	omap_soc_device_init();
>  }
>  #endif

Looks like this should be called for all omaps instead
of just omap4430?

I suggest you create omap_common_init_late() that
calls all the common init_late functions:

static void __init omap_common_init_late(void)
{
	omap_mux_late_init();
	omap2_common_pm_late_init();
	omap_soc_device_init();
}

Needs to be verified that these really are common to
all omap2+ though :)

Regards,

Tony

Re: [PATCH v3 2/2] ARM: OMAP2+: Export SoC information to userspace

[Ruslan Bilovol]

On Mon, Feb 11, 2013 at 7:56 PM, Tony Lindgren <tony@atomide.com> wrote:
> * Ruslan Bilovol <ruslan.bilovol@ti.com> [130206 14:54]:
>> --- a/arch/arm/mach-omap2/io.c
>> +++ b/arch/arm/mach-omap2/io.c
>> @@ -602,6 +602,7 @@ void __init omap4430_init_late(void)
>>       omap2_common_pm_late_init();
>>       omap4_pm_init();
>>       omap2_clk_enable_autoidle_all();
>> +     omap_soc_device_init();
>>  }
>>  #endif
>
> Looks like this should be called for all omaps instead
> of just omap4430?
>
> I suggest you create omap_common_init_late() that
> calls all the common init_late functions:
>
> static void __init omap_common_init_late(void)
> {
>         omap_mux_late_init();
>         omap2_common_pm_late_init();
>         omap_soc_device_init();
> }
>
> Needs to be verified that these really are common to
> all omap2+ though :)

Yes, you are right, currently these functions are common to all
init_late callbacks that we have right now in io.c
I will prepare additional patch soon...

>
> Regards,
>
> Tony
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