soc: xilinx: versal-net: Add soc_xilinx_versal_net driver
Add soc_xilinx_versal_net driver to identify the family & revision of
versal-net SoC. Add Kconfig option CONFIG_SOC_XILINX_VERSAL_NET to
enable/disable this driver. To enable this driver by default, add this
config to xilinx_versal_net_virt_defconfig file. This driver will be
probed using platdata U_BOOT_DEVICE structure which is specified in
mach-versal-net/cpu.c.
Signed-off-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>
Link: https://lore.kernel.org/r/613d6bcffd9070f62cf348079ed16c120f8fc56f.1668612993.git.michal.simek@amd.com
diff --git a/drivers/soc/soc_xilinx_versal_net.c b/drivers/soc/soc_xilinx_versal_net.c
new file mode 100644
index 0000000..146d068
--- /dev/null
+++ b/drivers/soc/soc_xilinx_versal_net.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Versal NET SOC driver
+ *
+ * Copyright (C) 2022, Advanced Micro Devices, Inc.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <soc.h>
+#include <zynqmp_firmware.h>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+
+#include <linux/bitfield.h>
+
+/*
+ * v1 -> 0x10 - ES1
+ * v2 -> 0x20 - Production
+ */
+static const char versal_family[] = "Versal NET";
+
+struct soc_xilinx_versal_net_priv {
+ const char *family;
+ char revision;
+};
+
+static int soc_xilinx_versal_net_get_family(struct udevice *dev, char *buf, int size)
+{
+ struct soc_xilinx_versal_net_priv *priv = dev_get_priv(dev);
+
+ return snprintf(buf, size, "%s", priv->family);
+}
+
+static int soc_xilinx_versal_net_get_revision(struct udevice *dev, char *buf, int size)
+{
+ struct soc_xilinx_versal_net_priv *priv = dev_get_priv(dev);
+
+ return snprintf(buf, size, "v%d", priv->revision);
+}
+
+static const struct soc_ops soc_xilinx_versal_net_ops = {
+ .get_family = soc_xilinx_versal_net_get_family,
+ .get_revision = soc_xilinx_versal_net_get_revision,
+};
+
+static int soc_xilinx_versal_net_probe(struct udevice *dev)
+{
+ struct soc_xilinx_versal_net_priv *priv = dev_get_priv(dev);
+ u32 ret_payload[PAYLOAD_ARG_CNT];
+ 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(PMC_TAP_VERSION);
+ if (!ret_payload[2])
+ return -EINVAL;
+ }
+
+ priv->revision = FIELD_GET(PS_VERSION_MASK, ret_payload[2]);
+
+ return 0;
+}
+
+U_BOOT_DRIVER(soc_xilinx_versal_net) = {
+ .name = "soc_xilinx_versal_net",
+ .id = UCLASS_SOC,
+ .ops = &soc_xilinx_versal_net_ops,
+ .probe = soc_xilinx_versal_net_probe,
+ .priv_auto = sizeof(struct soc_xilinx_versal_net_priv),
+ .flags = DM_FLAG_PRE_RELOC,
+};