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: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven
Simon Horman
parent
5384f45cd9
commit
8d6799a9ba
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@ -40,6 +40,7 @@ menuconfig ARCH_RENESAS
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select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
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select NO_IOPORT_MAP
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select PINCTRL
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select SOC_BUS
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select GPIOLIB
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select ZONE_DMA if ARM_LPAE
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@ -143,6 +143,7 @@ config ARCH_RENESAS
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select PM
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select PM_GENERIC_DOMAINS
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select RENESAS_IRQC
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select SOC_BUS
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help
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This enables support for the ARMv8 based Renesas SoCs.
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@ -1,3 +1,5 @@
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obj-$(CONFIG_SOC_BUS) += renesas-soc.o
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obj-$(CONFIG_ARCH_R8A7779) += rcar-sysc.o r8a7779-sysc.o
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obj-$(CONFIG_ARCH_R8A7790) += rcar-sysc.o r8a7790-sysc.o
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obj-$(CONFIG_ARCH_R8A7791) += rcar-sysc.o r8a7791-sysc.o
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@ -0,0 +1,257 @@
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/*
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* Renesas SoC Identification
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*
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* Copyright (C) 2014-2016 Glider bvba
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/sys_soc.h>
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struct renesas_family {
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const char name[16];
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u32 reg; /* CCCR or PRR, if not in DT */
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};
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static const struct renesas_family fam_rcar_gen1 __initconst __maybe_unused = {
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.name = "R-Car Gen1",
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.reg = 0xff000044, /* PRR (Product Register) */
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};
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static const struct renesas_family fam_rcar_gen2 __initconst __maybe_unused = {
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.name = "R-Car Gen2",
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.reg = 0xff000044, /* PRR (Product Register) */
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};
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static const struct renesas_family fam_rcar_gen3 __initconst __maybe_unused = {
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.name = "R-Car Gen3",
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.reg = 0xfff00044, /* PRR (Product Register) */
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};
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static const struct renesas_family fam_rmobile __initconst __maybe_unused = {
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.name = "R-Mobile",
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.reg = 0xe600101c, /* CCCR (Common Chip Code Register) */
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};
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static const struct renesas_family fam_rza __initconst __maybe_unused = {
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.name = "RZ/A",
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};
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static const struct renesas_family fam_rzg __initconst __maybe_unused = {
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.name = "RZ/G",
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.reg = 0xff000044, /* PRR (Product Register) */
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};
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static const struct renesas_family fam_shmobile __initconst __maybe_unused = {
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.name = "SH-Mobile",
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.reg = 0xe600101c, /* CCCR (Common Chip Code Register) */
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};
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struct renesas_soc {
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const struct renesas_family *family;
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u8 id;
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};
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static const struct renesas_soc soc_rz_a1h __initconst __maybe_unused = {
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.family = &fam_rza,
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};
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static const struct renesas_soc soc_rmobile_ape6 __initconst __maybe_unused = {
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.family = &fam_rmobile,
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.id = 0x3f,
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};
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static const struct renesas_soc soc_rmobile_a1 __initconst __maybe_unused = {
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.family = &fam_rmobile,
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.id = 0x40,
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};
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static const struct renesas_soc soc_rz_g1m __initconst __maybe_unused = {
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.family = &fam_rzg,
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.id = 0x47,
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};
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static const struct renesas_soc soc_rz_g1e __initconst __maybe_unused = {
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.family = &fam_rzg,
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.id = 0x4c,
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};
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static const struct renesas_soc soc_rcar_m1a __initconst __maybe_unused = {
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.family = &fam_rcar_gen1,
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};
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static const struct renesas_soc soc_rcar_h1 __initconst __maybe_unused = {
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.family = &fam_rcar_gen1,
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.id = 0x3b,
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};
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static const struct renesas_soc soc_rcar_h2 __initconst __maybe_unused = {
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.family = &fam_rcar_gen2,
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.id = 0x45,
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};
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static const struct renesas_soc soc_rcar_m2_w __initconst __maybe_unused = {
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.family = &fam_rcar_gen2,
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.id = 0x47,
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};
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static const struct renesas_soc soc_rcar_v2h __initconst __maybe_unused = {
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.family = &fam_rcar_gen2,
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.id = 0x4a,
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};
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static const struct renesas_soc soc_rcar_m2_n __initconst __maybe_unused = {
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.family = &fam_rcar_gen2,
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.id = 0x4b,
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};
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static const struct renesas_soc soc_rcar_e2 __initconst __maybe_unused = {
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.family = &fam_rcar_gen2,
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.id = 0x4c,
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};
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static const struct renesas_soc soc_rcar_h3 __initconst __maybe_unused = {
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.family = &fam_rcar_gen3,
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.id = 0x4f,
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};
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static const struct renesas_soc soc_rcar_m3_w __initconst __maybe_unused = {
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.family = &fam_rcar_gen3,
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.id = 0x52,
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};
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static const struct renesas_soc soc_shmobile_ag5 __initconst __maybe_unused = {
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.family = &fam_shmobile,
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.id = 0x37,
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};
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static const struct of_device_id renesas_socs[] __initconst = {
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#ifdef CONFIG_ARCH_R7S72100
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{ .compatible = "renesas,r7s72100", .data = &soc_rz_a1h },
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#endif
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#ifdef CONFIG_ARCH_R8A73A4
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{ .compatible = "renesas,r8a73a4", .data = &soc_rmobile_ape6 },
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#endif
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#ifdef CONFIG_ARCH_R8A7740
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{ .compatible = "renesas,r8a7740", .data = &soc_rmobile_a1 },
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#endif
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#ifdef CONFIG_ARCH_R8A7743
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{ .compatible = "renesas,r8a7743", .data = &soc_rz_g1m },
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#endif
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#ifdef CONFIG_ARCH_R8A7745
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{ .compatible = "renesas,r8a7745", .data = &soc_rz_g1e },
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#endif
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#ifdef CONFIG_ARCH_R8A7778
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{ .compatible = "renesas,r8a7778", .data = &soc_rcar_m1a },
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#endif
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#ifdef CONFIG_ARCH_R8A7779
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{ .compatible = "renesas,r8a7779", .data = &soc_rcar_h1 },
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#endif
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#ifdef CONFIG_ARCH_R8A7790
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{ .compatible = "renesas,r8a7790", .data = &soc_rcar_h2 },
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#endif
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#ifdef CONFIG_ARCH_R8A7791
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{ .compatible = "renesas,r8a7791", .data = &soc_rcar_m2_w },
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#endif
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#ifdef CONFIG_ARCH_R8A7792
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{ .compatible = "renesas,r8a7792", .data = &soc_rcar_v2h },
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#endif
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#ifdef CONFIG_ARCH_R8A7793
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{ .compatible = "renesas,r8a7793", .data = &soc_rcar_m2_n },
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#endif
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#ifdef CONFIG_ARCH_R8A7794
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{ .compatible = "renesas,r8a7794", .data = &soc_rcar_e2 },
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#endif
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#ifdef CONFIG_ARCH_R8A7795
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{ .compatible = "renesas,r8a7795", .data = &soc_rcar_h3 },
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#endif
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#ifdef CONFIG_ARCH_R8A7796
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{ .compatible = "renesas,r8a7796", .data = &soc_rcar_m3_w },
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#endif
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#ifdef CONFIG_ARCH_SH73A0
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{ .compatible = "renesas,sh73a0", .data = &soc_shmobile_ag5 },
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#endif
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{ /* sentinel */ }
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};
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static int __init renesas_soc_init(void)
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{
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struct soc_device_attribute *soc_dev_attr;
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const struct renesas_family *family;
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const struct of_device_id *match;
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const struct renesas_soc *soc;
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void __iomem *chipid = NULL;
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struct soc_device *soc_dev;
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struct device_node *np;
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unsigned int product;
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match = of_match_node(renesas_socs, of_root);
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if (!match)
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return -ENODEV;
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soc = match->data;
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family = soc->family;
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/* Try PRR first, then hardcoded fallback */
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np = of_find_compatible_node(NULL, NULL, "renesas,prr");
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if (np) {
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chipid = of_iomap(np, 0);
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of_node_put(np);
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} else if (soc->id) {
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chipid = ioremap(family->reg, 4);
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}
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if (chipid) {
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product = readl(chipid);
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iounmap(chipid);
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if (soc->id && ((product >> 8) & 0xff) != soc->id) {
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pr_warn("SoC mismatch (product = 0x%x)\n", product);
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return -ENODEV;
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}
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}
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soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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if (!soc_dev_attr)
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return -ENOMEM;
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np = of_find_node_by_path("/");
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of_property_read_string(np, "model", &soc_dev_attr->machine);
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of_node_put(np);
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soc_dev_attr->family = kstrdup_const(family->name, GFP_KERNEL);
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soc_dev_attr->soc_id = kstrdup_const(strchr(match->compatible, ',') + 1,
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GFP_KERNEL);
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if (chipid)
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soc_dev_attr->revision = kasprintf(GFP_KERNEL, "ES%u.%u",
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((product >> 4) & 0x0f) + 1,
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product & 0xf);
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pr_info("Detected Renesas %s %s %s\n", soc_dev_attr->family,
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soc_dev_attr->soc_id, soc_dev_attr->revision ?: "");
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev)) {
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kfree(soc_dev_attr->revision);
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kfree_const(soc_dev_attr->soc_id);
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kfree_const(soc_dev_attr->family);
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kfree(soc_dev_attr);
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return PTR_ERR(soc_dev);
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}
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return 0;
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}
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core_initcall(renesas_soc_init);
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