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>

MAINTAINERS

@@ -546,6 +546,7 @@ S:	Maintained
 T:	git https://source.denx.de/u-boot/custodians/u-boot-microblaze.git
 F:	arch/arm/mach-versal/
 F:	drivers/net/xilinx_axi_mrmac.*
+F:	drivers/soc/soc_xilinx_versal.c
 F:	drivers/watchdog/xilinx_wwdt.c
 N:	(?<!uni)versal
 

arch/arm/Kconfig

@@ -1055,6 +1055,7 @@ config ARCH_VERSAL
 	select DM_SERIAL
 	select GPIO_EXTRA_HEADER
 	select OF_CONTROL
+	select SOC_DEVICE
 	imply BOARD_LATE_INIT
 	imply ENV_VARS_UBOOT_RUNTIME_CONFIG
 

arch/arm/mach-versal/cpu.c

@@ -13,6 +13,7 @@
 #include <asm/arch/hardware.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/cache.h>
+#include <dm/platdata.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -120,3 +121,7 @@ int arm_reserve_mmu(void)
 	return 0;
 }
 #endif
+
+U_BOOT_DRVINFO(soc_xilinx_versal) = {
+	.name = "soc_xilinx_versal",
+};

arch/arm/mach-versal/include/mach/hardware.h

@@ -65,6 +65,10 @@ struct crp_regs {
 
 #define crp_base ((struct crp_regs *)VERSAL_CRP_BASEADDR)
 
+#define VERSAL_PS_PMC_VERSION	0xF11A0004
+#define VERSAL_PS_VER_MASK	GENMASK(7, 0)
+#define VERSAL_PS_VER_SHIFT	12
+
 /* Bootmode setting values */
 #define BOOT_MODES_MASK	0x0000000F
 #define QSPI_MODE_24BIT	0x00000001

configs/xilinx_versal_virt_defconfig

@@ -96,6 +96,7 @@ CONFIG_ZYNQ_GEM=y
 CONFIG_ARM_DCC=y
 CONFIG_PL01X_SERIAL=y
 CONFIG_XILINX_UARTLITE=y
+CONFIG_SOC_XILINX_VERSAL=y
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
 CONFIG_ZYNQ_SPI=y

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

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

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,
+};