soc: xilinx: versal: Add soc_xilinx_versal driver

soc_xilinx_versal driver allows identification of family & revision
of versal SoC. This driver is selected by CONFIG_SOC_XILINX_VERSAL.
Probe this driver using platdata U_BOOT_DEVICE structure which is
defined at mach-versal/cpu.c.
Add this config to xilinx_versal_virt_defconfig &
xilinx_versal_mini_ospi_defconfig file to select this driver.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Reviewed-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

3 files changed, 85 insertions, 0 deletions

diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index 17fb4c4..292dc41 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -24,6 +24,14 @@ config SOC_XILINX_ZYNQMP
 	  This allows other drivers to verify the SoC familiy & revision
 	  using matching SoC attributes.
 
+config SOC_XILINX_VERSAL
+	bool "Enable SoC Device ID driver for Xilinx Versal"
+	depends on SOC_DEVICE && ARCH_VERSAL
+	help
+	  Enable this option to select SoC device id driver for Xilinx Versal.
+	  This allows other drivers to verify the SoC familiy & revision using
+	  matching SoC attributes.
+
 source "drivers/soc/ti/Kconfig"
 
 endmenu
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 9b26573..031fa76 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_SOC_DEVICE) += soc-uclass.o
 obj-$(CONFIG_SOC_DEVICE_TI_K3) += soc_ti_k3.o
 obj-$(CONFIG_SANDBOX) += soc_sandbox.o
 obj-$(CONFIG_SOC_XILINX_ZYNQMP) += soc_xilinx_zynqmp.o
+obj-$(CONFIG_SOC_XILINX_VERSAL) += soc_xilinx_versal.o
diff --git a/drivers/soc/soc_xilinx_versal.c b/drivers/soc/soc_xilinx_versal.c
new file mode 100644
index 0000000..f8bcd9a
--- /dev/null
+++ b/drivers/soc/soc_xilinx_versal.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Versal SOC driver
+ *
+ * Copyright (C) 2021 Xilinx, Inc.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <soc.h>
+#include <zynqmp_firmware.h>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+
+/*
+ * v1 -> 0x10 - ES1
+ * v2 -> 0x20 - Production
+ */
+static const char versal_family[] = "Versal";
+
+struct soc_xilinx_versal_priv {
+	const char *family;
+	char revision;
+};
+
+static int soc_xilinx_versal_get_family(struct udevice *dev, char *buf, int size)
+{
+	struct soc_xilinx_versal_priv *priv = dev_get_priv(dev);
+
+	return snprintf(buf, size, "%s", priv->family);
+}
+
+static int soc_xilinx_versal_get_revision(struct udevice *dev, char *buf, int size)
+{
+	struct soc_xilinx_versal_priv *priv = dev_get_priv(dev);
+
+	return snprintf(buf, size, "v%d", priv->revision);
+}
+
+static const struct soc_ops soc_xilinx_versal_ops = {
+	.get_family = soc_xilinx_versal_get_family,
+	.get_revision = soc_xilinx_versal_get_revision,
+};
+
+static int soc_xilinx_versal_probe(struct udevice *dev)
+{
+	struct soc_xilinx_versal_priv *priv = dev_get_priv(dev);
+	u32 ret_payload[4];
+	int ret;
+
+	priv->family = versal_family;
+
+	if (IS_ENABLED(CONFIG_ZYNQMP_FIRMWARE)) {
+		ret = xilinx_pm_request(PM_GET_CHIPID, 0, 0, 0, 0,
+					ret_payload);
+		if (ret)
+			return ret;
+	} else {
+		ret_payload[2] = readl(VERSAL_PS_PMC_VERSION);
+		if (!ret_payload[2])
+			return -EINVAL;
+	}
+
+	priv->revision = ret_payload[2] >> VERSAL_PS_VER_SHIFT;
+
+	return 0;
+}
+
+U_BOOT_DRIVER(soc_xilinx_versal) = {
+	.name		= "soc_xilinx_versal",
+	.id		= UCLASS_SOC,
+	.ops		= &soc_xilinx_versal_ops,
+	.probe		= soc_xilinx_versal_probe,
+	.priv_auto	= sizeof(struct soc_xilinx_versal_priv),
+	.flags		= DM_FLAG_PRE_RELOC,
+};