sm.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <amdblocks/acpimmio.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/smbus.h>
#include <device/smbus_host.h>
 
static u32 get_sm_mmio(struct device *dev)
{
        /*
         * Since SMBus and ASF controller are behind the same PCIe device, we don't know behind
         * which controller a device is. We assume here that the devices are behind the SMBus
         * controller. The proper solution would be to handle those as MMIO devices instead of
         * PCI ones.
         */
        return (uintptr_t)acpimmio_smbus;
}
 
static int lsmbus_recv_byte(struct device *dev)
{
        u8 device;
 
        device = dev->path.i2c.device;
        return do_smbus_recv_byte(get_sm_mmio(dev), device);
}
 
static int lsmbus_send_byte(struct device *dev, u8 val)
{
        u8 device;
 
        device = dev->path.i2c.device;
        return do_smbus_send_byte(get_sm_mmio(dev), device, val);
}
 
static int lsmbus_read_byte(struct device *dev, u8 address)
{
        u8 device;
 
        device = dev->path.i2c.device;
        return do_smbus_read_byte(get_sm_mmio(dev), device, address);
}
 
static int lsmbus_write_byte(struct device *dev, u8 address, u8 val)
{
        u8 device;
 
        device = dev->path.i2c.device;
        return do_smbus_write_byte(get_sm_mmio(dev), device, address, val);
}
 
static struct smbus_bus_operations lops_smbus_bus = {
        .recv_byte = lsmbus_recv_byte,
        .send_byte = lsmbus_send_byte,
        .read_byte = lsmbus_read_byte,
        .write_byte = lsmbus_write_byte,
};
 
#if CONFIG(HAVE_ACPI_TABLES)
static const char *smbus_acpi_name(const struct device *dev)
{
        return "SBUS";
}
#endif
 
static struct device_operations smbus_ops = {
        .read_resources         = noop_read_resources,
        .set_resources          = noop_set_resources,
        .enable_resources       = pci_dev_enable_resources,
        .scan_bus               = scan_smbus,
        .ops_pci                = &pci_dev_ops_pci,
        .ops_smbus_bus          = &lops_smbus_bus,
#if CONFIG(HAVE_ACPI_TABLES)
        .acpi_name              = smbus_acpi_name,
#endif
};
 
static const struct pci_driver smbus_driver __pci_driver = {
        .ops = &smbus_ops,
        .vendor = PCI_VID_AMD,
        /* PCI device ID is used on all integrated FCHs except Family 16h Models 00h-3Fh */
        .device = PCI_DID_AMD_CZ_SMBUS,
};