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().
In addition, on SoCs that support it, the product ID is read from a
hardware register and validated, to catch accidental use of a DTB for a
different SoC.
Example:
Detected Renesas r8a7791 ES1.0
...
# cat /sys/devices/soc0/{family,machine,soc_id,revision}
R-Car Gen2
Koelsch
r8a7791
ES1.0
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
This patch does NOT add a call to
of_platform_default_populate(NULL, NULL,
soc_device_to_device(soc_dev));
Contrary to suggested by commit 74d1d82cdaaec727 ("drivers/base: add bus
for System-on-Chip devices), doing so would not only move on-SoC devices
from /sys/devices/platform/ to /sys/devices/soc0/, but also all other
board (off-SoC) devices specified in the DTB.
---
arch/arm/mach-shmobile/Kconfig | 1 +
arch/arm64/Kconfig.platforms | 1 +
drivers/soc/renesas/Makefile | 2 +
drivers/soc/renesas/renesas-soc.c | 266 ++++++++++++++++++++++++++++++++++++++
4 files changed, 270 insertions(+)
create mode 100644 drivers/soc/renesas/renesas-soc.c
diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index b5a3cbe81dd1d1f0..e41d2cbb2c825981 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -42,6 +42,7 @@ menuconfig ARCH_RENESAS
select HAVE_ARM_TWD if SMP
select NO_IOPORT_MAP
select PINCTRL
+ select SOC_BUS
select ZONE_DMA if ARM_LPAE
if ARCH_RENESAS
diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
index be5d824ebdba2dab..a2675afc61baba8d 100644
--- a/arch/arm64/Kconfig.platforms
+++ b/arch/arm64/Kconfig.platforms
@@ -131,6 +131,7 @@ 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.
diff --git a/drivers/soc/renesas/Makefile b/drivers/soc/renesas/Makefile
index 623039c3514cdc34..ae6ae8a11f98aba1 100644
--- a/drivers/soc/renesas/Makefile
+++ b/drivers/soc/renesas/Makefile
@@ -1,3 +1,5 @@
+obj-y += 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
diff --git a/drivers/soc/renesas/renesas-soc.c b/drivers/soc/renesas/renesas-soc.c
new file mode 100644
index 0000000000000000..74b72e4112b8889e
--- /dev/null
+++ b/drivers/soc/renesas/renesas-soc.c
@@ -0,0 +1,266 @@
+/*
+ * 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/slab.h>
+#include <linux/string.h>
+#include <linux/sys_soc.h>
+
+
+struct renesas_family {
+ const char name[16];
+ u32 reg; /* CCCR, PVR, or PRR */
+};
+
+static const struct renesas_family fam_emev2 __initconst = {
+ .name = "Emma Mobile EV2",
+};
+
+static const struct renesas_family fam_rmobile __initconst = {
+ .name = "R-Mobile",
+ .reg = 0xe600101c, /* CCCR (Common Chip Code Register) */
+};
+
+static const struct renesas_family fam_rcar_gen1 __initconst = {
+ .name = "R-Car Gen1",
+ .reg = 0xff000044, /* PRR (Product Register) */
+};
+
+static const struct renesas_family fam_rcar_gen2 __initconst = {
+ .name = "R-Car Gen2",
+ .reg = 0xff000044, /* PRR (Product Register) */
+};
+
+static const struct renesas_family fam_rcar_gen3 __initconst = {
+ .name = "R-Car Gen3",
+ .reg = 0xfff00044, /* PRR (Product Register) */
+};
+
+static const struct renesas_family fam_rza __initconst = {
+ .name = "RZ/A",
+};
+
+static const struct renesas_family fam_rzg __initconst = {
+ .name = "RZ/G",
+ .reg = 0xff000044, /* PRR (Product Register) */
+};
+
+static const struct renesas_family fam_shmobile __initconst = {
+ .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_emev2 __initconst = {
+ .family = &fam_emev2,
+};
+
+static const struct renesas_soc soc_rz_a1h __initconst = {
+ .family = &fam_rza,
+};
+
+static const struct renesas_soc soc_rmobile_ape6 __initconst = {
+ .family = &fam_rmobile,
+ .id = 0x3f,
+};
+
+static const struct renesas_soc soc_rmobile_a1 __initconst = {
+ .family = &fam_rmobile,
+ .id = 0x40,
+};
+
+static const struct renesas_soc soc_rz_g1m __initconst = {
+ .family = &fam_rzg,
+ .id = 0x47,
+};
+
+static const struct renesas_soc soc_rz_g1e __initconst = {
+ .family = &fam_rzg,
+ .id = 0x4c,
+};
+
+static const struct renesas_soc soc_rcar_m1a __initconst = {
+ .family = &fam_rcar_gen1,
+};
+
+static const struct renesas_soc soc_rcar_h1 __initconst = {
+ .family = &fam_rcar_gen1,
+ .id = 0x3b,
+};
+
+static const struct renesas_soc soc_rcar_h2 __initconst = {
+ .family = &fam_rcar_gen2,
+ .id = 0x45,
+};
+
+static const struct renesas_soc soc_rcar_m2_w __initconst = {
+ .family = &fam_rcar_gen2,
+ .id = 0x47,
+};
+
+static const struct renesas_soc soc_rcar_v2h __initconst = {
+ .family = &fam_rcar_gen2,
+ .id = 0x4a,
+};
+
+static const struct renesas_soc soc_rcar_m2_n __initconst = {
+ .family = &fam_rcar_gen2,
+ .id = 0x4b,
+};
+
+static const struct renesas_soc soc_rcar_e2 __initconst = {
+ .family = &fam_rcar_gen2,
+ .id = 0x4c,
+};
+
+static const struct renesas_soc soc_rcar_h3 __initconst = {
+ .family = &fam_rcar_gen3,
+ .id = 0x4f,
+};
+
+static const struct renesas_soc soc_rcar_m3_w __initconst = {
+ .family = &fam_rcar_gen3,
+ .id = 0x52,
+};
+
+static const struct renesas_soc soc_shmobile_ag5 __initconst = {
+ .family = &fam_shmobile,
+ .id = 0x37,
+};
+
+static const struct of_device_id renesas_socs[] __initconst = {
+#ifdef CONFIG_ARCH_EMEV2
+ { .compatible = "renesas,emev2", .data = &soc_emev2 },
+#endif
+#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;
+ unsigned int product, esi = 0, esf;
+ const struct of_device_id *match;
+ const struct renesas_soc *soc;
+ struct soc_device *soc_dev;
+ struct device_node *np;
+ void __iomem *mapped;
+
+ np = of_find_matching_node_and_match(NULL, renesas_socs, &match);
+ if (!np)
+ return -ENODEV;
+
+ of_node_put(np);
+ soc = match->data;
+ family = soc->family;
+
+ if (soc->id) {
+ mapped = ioremap(family->reg, 4);
+ if (!mapped)
+ return -ENOMEM;
+
+ product = readl(mapped);
+ iounmap(mapped);
+
+ if (((product >> 8) & 0xff) != soc->id) {
+ pr_crit("SoC mismatch (product = 0x%x)\n", product);
+ return -ENODEV;
+ }
+
+ esi = ((product >> 4) & 0x0f) + 1;
+ esf = product & 0xf;
+ }
+
+ 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 (esi > 0)
+ soc_dev_attr->revision = kasprintf(GFP_KERNEL, "ES%u.%u", esi,
+ esf);
+
+ pr_info("Detected Renesas %s %s\n", 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);
--
1.9.1
