[PATCH v3 4/4] dm: soc: SoC identification driver for Renesas SoC's

Biju Das biju.das.jz at bp.renesas.com
Wed Nov 4 11:56:16 CET 2020


Add SoC identification driver for Renesas SoC's. This allows
to identify the SoC type and revision based on Product Register.

This can be checked where needed using soc_device_match().

Signed-off-by: Biju Das <biju.das.jz at bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj at bp.renesas.com>
---
v2->v3: No Change.
v2: New patch
---
 drivers/soc/Kconfig       |   7 ++
 drivers/soc/Makefile      |   1 +
 drivers/soc/soc_renesas.c | 239 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 247 insertions(+)
 create mode 100644 drivers/soc/soc_renesas.c

diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index 864d00a885..475e94cd77 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -16,6 +16,13 @@ config SOC_DEVICE_TI_K3
 	  This allows Texas Instruments Keystone 3 SoCs to identify
 	  specifics about the SoC in use.
 
+config SOC_DEVICE_RENESAS
+	depends on SOC_DEVICE
+	bool "Enable SoC driver for Renesas SoCs"
+	help
+	  This allows Renesas SoCs to identify specifics about the
+	  SoC in use.
+
 source "drivers/soc/ti/Kconfig"
 
 endmenu
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 9ef20ca506..b143eac5fd 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -4,5 +4,6 @@
 
 obj-$(CONFIG_SOC_TI) += ti/
 obj-$(CONFIG_SOC_DEVICE) += soc-uclass.o
+obj-$(CONFIG_$(SPL_)SOC_DEVICE_RENESAS) += soc_renesas.o
 obj-$(CONFIG_SOC_DEVICE_TI_K3) += soc_ti_k3.o
 obj-$(CONFIG_SANDBOX) += soc_sandbox.o
diff --git a/drivers/soc/soc_renesas.c b/drivers/soc/soc_renesas.c
new file mode 100644
index 0000000000..4543e0dbfd
--- /dev/null
+++ b/drivers/soc/soc_renesas.c
@@ -0,0 +1,239 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Renesas Electronics Corp.
+ *
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/device-internal.h>
+#include <soc.h>
+
+#include <asm/io.h>
+
+struct soc_renesas_priv {
+	const char *family;
+	const char *soc_id;
+	char revision[6];
+};
+
+struct renesas_family {
+	const char name[16];
+	u32 reg;			/* CCCR or PRR, if not in DT */
+};
+
+static const struct renesas_family fam_rcar_gen3 __maybe_unused = {
+	.name	= "R-Car Gen3",
+	.reg	= 0xfff00044,		/* PRR (Product Register) */
+};
+
+static const struct renesas_family fam_rzg2 __maybe_unused = {
+	.name	= "RZ/G2",
+	.reg	= 0xfff00044,		/* PRR (Product Register) */
+};
+
+struct renesas_soc {
+	const struct renesas_family *family;
+	u8 id;
+};
+
+#ifdef CONFIG_R8A774A1
+static const struct renesas_soc soc_rz_g2m = {
+	.family	= &fam_rzg2,
+	.id	= 0x52,
+};
+#endif
+
+#ifdef CONFIG_R8A774B1
+static const struct renesas_soc soc_rz_g2n = {
+	.family = &fam_rzg2,
+	.id     = 0x55,
+};
+#endif
+
+#ifdef CONFIG_R8A774C0
+static const struct renesas_soc soc_rz_g2e = {
+	.family	= &fam_rzg2,
+	.id	= 0x57,
+};
+#endif
+
+#ifdef CONFIG_R8A774E1
+static const struct renesas_soc soc_rz_g2h = {
+	.family	= &fam_rzg2,
+	.id	= 0x4f,
+};
+#endif
+
+#ifdef CONFIG_R8A7795
+static const struct renesas_soc soc_rcar_h3 = {
+	.family	= &fam_rcar_gen3,
+	.id	= 0x4f,
+};
+#endif
+
+#ifdef CONFIG_R8A7796
+static const struct renesas_soc soc_rcar_m3_w = {
+	.family	= &fam_rcar_gen3,
+	.id	= 0x52,
+};
+#endif
+
+#ifdef CONFIG_R8A77965
+static const struct renesas_soc soc_rcar_m3_n = {
+	.family = &fam_rcar_gen3,
+	.id     = 0x55,
+};
+#endif
+
+#ifdef CONFIG_R8A77970
+static const struct renesas_soc soc_rcar_v3m = {
+	.family	= &fam_rcar_gen3,
+	.id	= 0x54,
+};
+#endif
+
+#ifdef CONFIG_R8A77980
+static const struct renesas_soc soc_rcar_v3h = {
+	.family	= &fam_rcar_gen3,
+	.id	= 0x56,
+};
+#endif
+
+#ifdef CONFIG_R8A77990
+static const struct renesas_soc soc_rcar_e3 = {
+	.family	= &fam_rcar_gen3,
+	.id	= 0x57,
+};
+#endif
+
+#ifdef CONFIG_R8A77995
+static const struct renesas_soc soc_rcar_d3 = {
+	.family	= &fam_rcar_gen3,
+	.id	= 0x58,
+};
+#endif
+
+static int soc_renesas_get_family(struct udevice *dev, char *buf, int size)
+{
+	struct soc_renesas_priv *priv = dev_get_priv(dev);
+
+	snprintf(buf, size, "%s", priv->family);
+
+	return 0;
+}
+
+static int soc_renesas_get_revision(struct udevice *dev, char *buf, int size)
+{
+	struct soc_renesas_priv *priv = dev_get_priv(dev);
+
+	snprintf(buf, size, "%s", priv->revision);
+
+	return 0;
+}
+
+static int soc_renesas_get_soc_id(struct udevice *dev, char *buf, int size)
+{
+	struct soc_renesas_priv *priv = dev_get_priv(dev);
+
+	snprintf(buf, size, "%s", priv->soc_id);
+
+	return 0;
+}
+
+static const struct udevice_id renesas_socs[] = {
+#ifdef CONFIG_R8A774A1
+	{ .compatible = "renesas,r8a774a1",	.data = (ulong)&soc_rz_g2m, },
+#endif
+#ifdef CONFIG_R8A774B1
+	{ .compatible = "renesas,r8a774b1",	.data = (ulong)&soc_rz_g2n, },
+#endif
+#ifdef CONFIG_R8A774C0
+	{ .compatible = "renesas,r8a774c0",	.data = (ulong)&soc_rz_g2e, },
+#endif
+#ifdef CONFIG_R8A774E1
+	{ .compatible = "renesas,r8a774e1",	.data = (ulong)&soc_rz_g2h, },
+#endif
+#ifdef CONFIG_R8A7795
+	{ .compatible = "renesas,r8a7795",	.data = (ulong)&soc_rcar_h3, },
+#endif
+#ifdef CONFIG_R8A7796
+	{ .compatible = "renesas,r8a7796",	.data = (ulong)&soc_rcar_m3_w, },
+#endif
+#ifdef CONFIG_R8A77965
+	{ .compatible = "renesas,r8a77965",	.data = (ulong)&soc_rcar_m3_n, },
+#endif
+#ifdef CONFIG_R8A77970
+	{ .compatible = "renesas,r8a77970",	.data = (ulong)&soc_rcar_v3m, },
+#endif
+#ifdef CONFIG_R8A77980
+	{ .compatible = "renesas,r8a77980",	.data = (ulong)&soc_rcar_v3h, },
+#endif
+#ifdef CONFIG_R8A77990
+	{ .compatible = "renesas,r8a77990",	.data = (ulong)&soc_rcar_e3, },
+#endif
+#ifdef CONFIG_R8A77995
+	{ .compatible = "renesas,r8a77995",	.data = (ulong)&soc_rcar_d3, },
+#endif
+	{ /* sentinel */ }
+};
+
+static const struct udevice_id prr_ids[] = {
+	{ .compatible = "renesas,prr" },
+	{ /* sentinel */ }
+};
+
+static const struct soc_ops soc_renesas_ops = {
+	.get_family = soc_renesas_get_family,
+	.get_revision = soc_renesas_get_revision,
+	.get_soc_id = soc_renesas_get_soc_id,
+};
+
+int soc_renesas_probe(struct udevice *dev)
+{
+	struct soc_renesas_priv *priv = dev_get_priv(dev);
+	const struct renesas_family *family;
+	const struct udevice_id *match;
+	struct renesas_soc *soc;
+	unsigned int product, eshi = 0, eslo;
+	ofnode root_node;
+
+	root_node = ofnode_path("/");
+	match = of_match_node(renesas_socs, root_node);
+	if (!match) {
+		printf("SoC entry is missing in DT\n");
+		return 0;
+	}
+
+	soc = (struct renesas_soc *)match->data;
+	family = soc->family;
+
+	product = readl(0xFFF00044);
+	/* R-Car M3-W ES1.1 incorrectly identifies as ES2.0 */
+	if ((product & 0x7fff) == 0x5210)
+		product ^= 0x11;
+	/* R-Car M3-W ES1.3 incorrectly identifies as ES2.1 */
+	if ((product & 0x7fff) == 0x5211)
+		product ^= 0x12;
+	if (soc->id && ((product >> 8) & 0xff) != soc->id) {
+		printf("SoC mismatch (product = 0x%x)\n", product);
+		return 0;
+	}
+	eshi = ((product >> 4) & 0x0f) + 1;
+	eslo = product & 0xf;
+
+	priv->family = family->name;
+	priv->soc_id = strchr(match->compatible, ',') + 1;
+	snprintf(priv->revision, sizeof(priv->revision), "ES%u.%u", eshi, eslo);
+
+	return 0;
+}
+
+U_BOOT_DRIVER(soc_renesas) = {
+	.name           = "soc_renesas",
+	.id             = UCLASS_SOC,
+	.ops		= &soc_renesas_ops,
+	.of_match       = prr_ids,
+	.probe          = soc_renesas_probe,
+	.priv_auto_alloc_size  = sizeof(struct soc_renesas_priv),
+};
-- 
2.17.1



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