smbus_ops.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/device.h>
#include <device/path.h>
#include <device/smbus.h>
#include <device/pci.h>
#include <device/pci_def.h>
#include <device/pci_ids.h>
#include <device/smbus_host.h>
#include <southbridge/intel/common/smbus_ops.h>
 
static int lsmbus_read_byte(struct device *dev, u8 address)
{
        u16 device;
        struct resource *res;
        struct bus *pbus;
 
        device = dev->path.i2c.device;
        pbus = get_pbus_smbus(dev);
        res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);
 
        return do_smbus_read_byte(res->base, device, address);
}
 
static int lsmbus_write_byte(struct device *dev, u8 address, u8 data)
{
        u16 device;
        struct resource *res;
        struct bus *pbus;
 
        device = dev->path.i2c.device;
        pbus = get_pbus_smbus(dev);
        res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);
        return do_smbus_write_byte(res->base, device, address, data);
}
 
static int lsmbus_block_write(struct device *dev, u8 cmd, u8 bytes, const u8 *buf)
{
        u16 device;
        struct resource *res;
        struct bus *pbus;
 
        device = dev->path.i2c.device;
        pbus = get_pbus_smbus(dev);
        res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);
        return do_smbus_block_write(res->base, device, cmd, bytes, buf);
}
 
static int lsmbus_block_read(struct device *dev, u8 cmd, u8 bytes, u8 *buf)
{
        u16 device;
        struct resource *res;
        struct bus *pbus;
 
        device = dev->path.i2c.device;
        pbus = get_pbus_smbus(dev);
        res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);
        return do_smbus_block_read(res->base, device, cmd, bytes, buf);
}
 
struct smbus_bus_operations lops_smbus_bus = {
        .read_byte      = lsmbus_read_byte,
        .write_byte     = lsmbus_write_byte,
        .block_read     = lsmbus_block_read,
        .block_write    = lsmbus_block_write,
};
 
void smbus_read_resources(struct device *dev)
{
        pci_dev_read_resources(dev);
 
        struct resource *res = new_resource(dev, PCI_BASE_ADDRESS_4);
        res->base = CONFIG_FIXED_SMBUS_IO_BASE;
        res->size = 32;
        res->limit = res->base + res->size - 1;
        res->flags = IORESOURCE_IO | IORESOURCE_FIXED | IORESOURCE_RESERVE |
                     IORESOURCE_STORED | IORESOURCE_ASSIGNED;
}