1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/spi/spi-amd-pci.c b/drivers/spi/spi-amd-pci.c
new file mode 100644
index 000000000000..e5faab414c17
--- /dev/null
+++ b/drivers/spi/spi-amd-pci.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AMD SPI controller driver
+ *
+ * Copyright (c) 2025, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Authors: Krishnamoorthi M <krishnamoorthi.m@amd.com>
+ *          Akshata MukundShetty <akshata.mukundshetty@amd.com>
+ */
+
+#include <linux/init.h>
+#include <linux/spi/spi.h>
+#include <linux/pci.h>
+
+#include "spi-amd.h"
+
+#define AMD_PCI_DEVICE_ID_LPC_BRIDGE		0x1682
+#define AMD_PCI_LPC_SPI_BASE_ADDR_REG		0xA0
+#define AMD_SPI_BASE_ADDR_MASK			~0xFF
+#define AMD_HID2_PCI_BAR_OFFSET			0x00002000
+#define AMD_HID2_MEM_SIZE			0x200
+
+static struct pci_device_id pci_spi_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_PCI_DEVICE_ID_LPC_BRIDGE) },
+	{ 0, }
+};
+MODULE_DEVICE_TABLE(pci, pci_spi_ids);
+
+static int amd_spi_pci_probe(struct pci_dev *pdev,
+			     const struct pci_device_id *id)
+{
+	struct device *dev = &pdev->dev;
+	struct spi_controller *host;
+	struct amd_spi *amd_spi;
+	u32 io_base_addr;
+
+	/* Allocate storage for host and driver private data */
+	host = devm_spi_alloc_host(dev, sizeof(struct amd_spi));
+	if (!host)
+		return dev_err_probe(dev, -ENOMEM, "Error allocating SPI host\n");
+
+	amd_spi = spi_controller_get_devdata(host);
+
+	pci_read_config_dword(pdev, AMD_PCI_LPC_SPI_BASE_ADDR_REG, &io_base_addr);
+	io_base_addr = (io_base_addr & AMD_SPI_BASE_ADDR_MASK) + AMD_HID2_PCI_BAR_OFFSET;
+	amd_spi->io_remap_addr = devm_ioremap(dev, io_base_addr, AMD_HID2_MEM_SIZE);
+
+	if (!amd_spi->io_remap_addr)
+		return dev_err_probe(dev, -ENOMEM,
+				"ioremap of SPI registers failed\n");
+
+	dev_dbg(dev, "io_remap_address: %p\n", amd_spi->io_remap_addr);
+
+	amd_spi->version = AMD_HID2_SPI;
+	host->bus_num = 2;
+
+	return amd_spi_probe_common(dev, host);
+}
+
+static struct pci_driver amd_spi_pci_driver = {
+	.name = "amd_spi_pci",
+	.id_table = pci_spi_ids,
+	.probe = amd_spi_pci_probe,
+};
+
+module_pci_driver(amd_spi_pci_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("AMD HID2 SPI Controller Driver");