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// 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");
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