Commit 8d6799a9 authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Simon Horman
Browse files

soc: renesas: Identify SoC and register with the SoC bus 



Identify the SoC type and revision, and register this information with
the SoC bus, so it is available under /sys/devices/soc0/, and can be
checked where needed using soc_device_match().

Identification is done using the Product Register or Common Chip Code
Register, as declared in DT (PRR only for now), or using a hardcoded
fallback if missing.

Example:

    Detected Renesas R-Car Gen2 r8a7791 ES1.0
    ...
    # cat /sys/devices/soc0/{machine,family,soc_id,revision}
    Koelsch
    R-Car Gen2
    r8a7791
    ES1.0

Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarSimon Horman <horms+renesas@verge.net.au>
parent 5384f45c

arch/arm/mach-shmobile/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ menuconfig ARCH_RENESAS 
	select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE

	select NO_IOPORT_MAP

	select PINCTRL

	select SOC_BUS

	select GPIOLIB

	select ZONE_DMA if ARM_LPAE

arch/arm64/Kconfig.platforms

+1 −0
Original line number Diff line number Diff line
@@ -143,6 +143,7 @@ config ARCH_RENESAS 
	select PM

	select PM_GENERIC_DOMAINS

	select RENESAS_IRQC

	select SOC_BUS

	help

	  This enables support for the ARMv8 based Renesas SoCs.

drivers/soc/renesas/Makefile

+2 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_SOC_BUS)		+= renesas-soc.o



obj-$(CONFIG_ARCH_R8A7779)	+= rcar-sysc.o r8a7779-sysc.o

obj-$(CONFIG_ARCH_R8A7790)	+= rcar-sysc.o r8a7790-sysc.o

obj-$(CONFIG_ARCH_R8A7791)	+= rcar-sysc.o r8a7791-sysc.o

drivers/soc/renesas/renesas-soc.c

0 → 100644
+257 −0
Original line number Diff line number Diff line 
/*

 * Renesas SoC Identification

 *

 * Copyright (C) 2014-2016 Glider bvba

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/slab.h>

#include <linux/string.h>

#include <linux/sys_soc.h>





struct renesas_family {

	const char name[16];

	u32 reg;			/* CCCR or PRR, if not in DT */

};



static const struct renesas_family fam_rcar_gen1 __initconst __maybe_unused = {

	.name	= "R-Car Gen1",

	.reg	= 0xff000044,		/* PRR (Product Register) */

};



static const struct renesas_family fam_rcar_gen2 __initconst __maybe_unused = {

	.name	= "R-Car Gen2",

	.reg	= 0xff000044,		/* PRR (Product Register) */

};



static const struct renesas_family fam_rcar_gen3 __initconst __maybe_unused = {

	.name	= "R-Car Gen3",

	.reg	= 0xfff00044,		/* PRR (Product Register) */

};



static const struct renesas_family fam_rmobile __initconst __maybe_unused = {

	.name	= "R-Mobile",

	.reg	= 0xe600101c,		/* CCCR (Common Chip Code Register) */

};



static const struct renesas_family fam_rza __initconst __maybe_unused = {

	.name	= "RZ/A",

};



static const struct renesas_family fam_rzg __initconst __maybe_unused = {

	.name	= "RZ/G",

	.reg	= 0xff000044,		/* PRR (Product Register) */

};



static const struct renesas_family fam_shmobile __initconst __maybe_unused = {

	.name	= "SH-Mobile",

	.reg	= 0xe600101c,		/* CCCR (Common Chip Code Register) */

};





struct renesas_soc {

	const struct renesas_family *family;

	u8 id;

};



static const struct renesas_soc soc_rz_a1h __initconst __maybe_unused = {

	.family	= &fam_rza,

};



static const struct renesas_soc soc_rmobile_ape6 __initconst __maybe_unused = {

	.family	= &fam_rmobile,

	.id	= 0x3f,

};



static const struct renesas_soc soc_rmobile_a1 __initconst __maybe_unused = {

	.family	= &fam_rmobile,

	.id	= 0x40,

};



static const struct renesas_soc soc_rz_g1m __initconst __maybe_unused = {

	.family	= &fam_rzg,

	.id	= 0x47,

};



static const struct renesas_soc soc_rz_g1e __initconst __maybe_unused = {

	.family	= &fam_rzg,

	.id	= 0x4c,

};



static const struct renesas_soc soc_rcar_m1a __initconst __maybe_unused = {

	.family	= &fam_rcar_gen1,

};



static const struct renesas_soc soc_rcar_h1 __initconst __maybe_unused = {

	.family	= &fam_rcar_gen1,

	.id	= 0x3b,

};



static const struct renesas_soc soc_rcar_h2 __initconst __maybe_unused = {

	.family	= &fam_rcar_gen2,

	.id	= 0x45,

};



static const struct renesas_soc soc_rcar_m2_w __initconst __maybe_unused = {

	.family	= &fam_rcar_gen2,

	.id	= 0x47,

};



static const struct renesas_soc soc_rcar_v2h __initconst __maybe_unused = {

	.family	= &fam_rcar_gen2,

	.id	= 0x4a,

};



static const struct renesas_soc soc_rcar_m2_n __initconst __maybe_unused = {

	.family	= &fam_rcar_gen2,

	.id	= 0x4b,

};



static const struct renesas_soc soc_rcar_e2 __initconst __maybe_unused = {

	.family	= &fam_rcar_gen2,

	.id	= 0x4c,

};



static const struct renesas_soc soc_rcar_h3 __initconst __maybe_unused = {

	.family	= &fam_rcar_gen3,

	.id	= 0x4f,

};



static const struct renesas_soc soc_rcar_m3_w __initconst __maybe_unused = {

	.family	= &fam_rcar_gen3,

	.id	= 0x52,

};



static const struct renesas_soc soc_shmobile_ag5 __initconst __maybe_unused = {

	.family	= &fam_shmobile,

	.id	= 0x37,

};





static const struct of_device_id renesas_socs[] __initconst = {

#ifdef CONFIG_ARCH_R7S72100

	{ .compatible = "renesas,r7s72100",	.data = &soc_rz_a1h },

#endif

#ifdef CONFIG_ARCH_R8A73A4

	{ .compatible = "renesas,r8a73a4",	.data = &soc_rmobile_ape6 },

#endif

#ifdef CONFIG_ARCH_R8A7740

	{ .compatible = "renesas,r8a7740",	.data = &soc_rmobile_a1 },

#endif

#ifdef CONFIG_ARCH_R8A7743

	{ .compatible = "renesas,r8a7743",	.data = &soc_rz_g1m },

#endif

#ifdef CONFIG_ARCH_R8A7745

	{ .compatible = "renesas,r8a7745",	.data = &soc_rz_g1e },

#endif

#ifdef CONFIG_ARCH_R8A7778

	{ .compatible = "renesas,r8a7778",	.data = &soc_rcar_m1a },

#endif

#ifdef CONFIG_ARCH_R8A7779

	{ .compatible = "renesas,r8a7779",	.data = &soc_rcar_h1 },

#endif

#ifdef CONFIG_ARCH_R8A7790

	{ .compatible = "renesas,r8a7790",	.data = &soc_rcar_h2 },

#endif

#ifdef CONFIG_ARCH_R8A7791

	{ .compatible = "renesas,r8a7791",	.data = &soc_rcar_m2_w },

#endif

#ifdef CONFIG_ARCH_R8A7792

	{ .compatible = "renesas,r8a7792",	.data = &soc_rcar_v2h },

#endif

#ifdef CONFIG_ARCH_R8A7793

	{ .compatible = "renesas,r8a7793",	.data = &soc_rcar_m2_n },

#endif

#ifdef CONFIG_ARCH_R8A7794

	{ .compatible = "renesas,r8a7794",	.data = &soc_rcar_e2 },

#endif

#ifdef CONFIG_ARCH_R8A7795

	{ .compatible = "renesas,r8a7795",	.data = &soc_rcar_h3 },

#endif

#ifdef CONFIG_ARCH_R8A7796

	{ .compatible = "renesas,r8a7796",	.data = &soc_rcar_m3_w },

#endif

#ifdef CONFIG_ARCH_SH73A0

	{ .compatible = "renesas,sh73a0",	.data = &soc_shmobile_ag5 },

#endif

	{ /* sentinel */ }

};



static int __init renesas_soc_init(void)

{

	struct soc_device_attribute *soc_dev_attr;

	const struct renesas_family *family;

	const struct of_device_id *match;

	const struct renesas_soc *soc;

	void __iomem *chipid = NULL;

	struct soc_device *soc_dev;

	struct device_node *np;

	unsigned int product;



	match = of_match_node(renesas_socs, of_root);

	if (!match)

		return -ENODEV;



	soc = match->data;

	family = soc->family;



	/* Try PRR first, then hardcoded fallback */

	np = of_find_compatible_node(NULL, NULL, "renesas,prr");

	if (np) {

		chipid = of_iomap(np, 0);

		of_node_put(np);

	} else if (soc->id) {

		chipid = ioremap(family->reg, 4);

	}

	if (chipid) {

		product = readl(chipid);

		iounmap(chipid);

		if (soc->id && ((product >> 8) & 0xff) != soc->id) {

			pr_warn("SoC mismatch (product = 0x%x)\n", product);

			return -ENODEV;

		}

	}



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

	if (!soc_dev_attr)

		return -ENOMEM;



	np = of_find_node_by_path("/");

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

	of_node_put(np);



	soc_dev_attr->family = kstrdup_const(family->name, GFP_KERNEL);

	soc_dev_attr->soc_id = kstrdup_const(strchr(match->compatible, ',') + 1,

					     GFP_KERNEL);

	if (chipid)

		soc_dev_attr->revision = kasprintf(GFP_KERNEL, "ES%u.%u",

						   ((product >> 4) & 0x0f) + 1,

						   product & 0xf);



	pr_info("Detected Renesas %s %s %s\n", soc_dev_attr->family,

		soc_dev_attr->soc_id, soc_dev_attr->revision ?: "");



	soc_dev = soc_device_register(soc_dev_attr);

	if (IS_ERR(soc_dev)) {

		kfree(soc_dev_attr->revision);

		kfree_const(soc_dev_attr->soc_id);

		kfree_const(soc_dev_attr->family);

		kfree(soc_dev_attr);

		return PTR_ERR(soc_dev);

	}



	return 0;

}

core_initcall(renesas_soc_init);

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