Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 5e68c0fc authored by Martin Blumenstingl's avatar Martin Blumenstingl Committed by Kevin Hilman
Browse files

soc: amlogic: Add Meson6/Meson8/Meson8b/Meson8m2 SoC Information driver 



Amlogic SoCs have an information register which contains the SoC type
and revision information.
This patchs adds support for decoding those registers and exposing the
resulting information via the SoC bus infrastructure.

Signed-off-by: default avatarMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: default avatarKevin Hilman <khilman@baylibre.com>
parent 2bd6bf03

drivers/soc/amlogic/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -9,4 +9,14 @@ config MESON_GX_SOCINFO 
	  Say yes to support decoding of Amlogic Meson GX SoC family

	  information about the type, package and version.



config MESON_MX_SOCINFO

	bool "Amlogic Meson MX SoC Information driver"

	depends on ARCH_MESON || COMPILE_TEST

	default ARCH_MESON

	select SOC_BUS

	help

	  Say yes to support decoding of Amlogic Meson6, Meson8,

	  Meson8b and Meson8m2 SoC family information about the type

	  and version.



endmenu

drivers/soc/amlogic/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o

obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o

drivers/soc/amlogic/meson-mx-socinfo.c

0 → 100644
+175 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>

 *

 * SPDX-License-Identifier: GPL-2.0+

 */



#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/sys_soc.h>

#include <linux/bitfield.h>

#include <linux/regmap.h>

#include <linux/mfd/syscon.h>



#define MESON_SOCINFO_MAJOR_VER_MESON6		0x16

#define MESON_SOCINFO_MAJOR_VER_MESON8		0x19

#define MESON_SOCINFO_MAJOR_VER_MESON8B		0x1b



#define MESON_MX_ASSIST_HW_REV			0x14c



#define MESON_MX_ANALOG_TOP_METAL_REVISION	0x0



#define MESON_MX_BOOTROM_MISC_VER		0x4



static const char *meson_mx_socinfo_revision(unsigned int major_ver,

					     unsigned int misc_ver,

					     unsigned int metal_rev)

{

	unsigned int minor_ver;



	switch (major_ver) {

	case MESON_SOCINFO_MAJOR_VER_MESON6:

		minor_ver = 0xa;

		break;



	case MESON_SOCINFO_MAJOR_VER_MESON8:

		if (metal_rev == 0x11111112)

			major_ver = 0x1d;



		if (metal_rev == 0x11111111 || metal_rev == 0x11111112)

			minor_ver = 0xa;

		else if (metal_rev == 0x11111113)

			minor_ver = 0xb;

		else if (metal_rev == 0x11111133)

			minor_ver = 0xc;

		else

			minor_ver = 0xd;



		break;



	case MESON_SOCINFO_MAJOR_VER_MESON8B:

		if (metal_rev == 0x11111111)

			minor_ver = 0xa;

		else

			minor_ver = 0xb;



		break;



	default:

		minor_ver = 0x0;

		break;

	}



	return kasprintf(GFP_KERNEL, "Rev%X (%x - 0:%X)", minor_ver, major_ver,

			 misc_ver);

}



static const char *meson_mx_socinfo_soc_id(unsigned int major_ver,

					   unsigned int metal_rev)

{

	const char *soc_id;



	switch (major_ver) {

	case MESON_SOCINFO_MAJOR_VER_MESON6:

		soc_id = "Meson6 (AML8726-MX)";

		break;



	case MESON_SOCINFO_MAJOR_VER_MESON8:

		if (metal_rev == 0x11111112)

			soc_id = "Meson8m2 (S812)";

		else

			soc_id = "Meson8 (S802)";



		break;



	case MESON_SOCINFO_MAJOR_VER_MESON8B:

		soc_id = "Meson8b (S805)";

		break;



	default:

		soc_id = "Unknown";

		break;

	}



	return kstrdup_const(soc_id, GFP_KERNEL);

}



static const struct of_device_id meson_mx_socinfo_analog_top_ids[] = {

	{ .compatible = "amlogic,meson8-analog-top", },

	{ .compatible = "amlogic,meson8b-analog-top", },

	{ /* sentinel */ }

};



int __init meson_mx_socinfo_init(void)

{

	struct soc_device_attribute *soc_dev_attr;

	struct soc_device *soc_dev;

	struct device_node *np;

	struct regmap *assist_regmap, *bootrom_regmap, *analog_top_regmap;

	unsigned int major_ver, misc_ver, metal_rev = 0;

	int ret;



	assist_regmap =

		syscon_regmap_lookup_by_compatible("amlogic,meson-mx-assist");

	if (IS_ERR(assist_regmap))

		return PTR_ERR(assist_regmap);



	bootrom_regmap =

		syscon_regmap_lookup_by_compatible("amlogic,meson-mx-bootrom");

	if (IS_ERR(bootrom_regmap))

		return PTR_ERR(bootrom_regmap);



	np = of_find_matching_node(NULL, meson_mx_socinfo_analog_top_ids);

	if (np) {

		analog_top_regmap = syscon_node_to_regmap(np);

		if (IS_ERR(analog_top_regmap))

			return PTR_ERR(analog_top_regmap);



		ret = regmap_read(analog_top_regmap,

				  MESON_MX_ANALOG_TOP_METAL_REVISION,

				  &metal_rev);

		if (ret)

			return ret;

	}



	ret = regmap_read(assist_regmap, MESON_MX_ASSIST_HW_REV, &major_ver);

	if (ret < 0)

		return ret;



	ret = regmap_read(bootrom_regmap, MESON_MX_BOOTROM_MISC_VER,

			  &misc_ver);

	if (ret < 0)

		return ret;



	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);

	if (!soc_dev_attr)

		return -ENODEV;



	soc_dev_attr->family = "Amlogic Meson";



	np = of_find_node_by_path("/");

	of_property_read_string(np, "model", &soc_dev_attr->machine);

	of_node_put(np);



	soc_dev_attr->revision = meson_mx_socinfo_revision(major_ver, misc_ver,

							   metal_rev);

	soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);



	soc_dev = soc_device_register(soc_dev_attr);

	if (IS_ERR(soc_dev)) {

		kfree_const(soc_dev_attr->revision);

		kfree_const(soc_dev_attr->soc_id);

		kfree(soc_dev_attr);

		return PTR_ERR(soc_dev);

	}



	dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",

		 soc_dev_attr->soc_id, soc_dev_attr->revision);



	return 0;

}

device_initcall(meson_mx_socinfo_init);