smbus.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#define __SIMPLE_DEVICE__
 
#include <soc/iomap.h>
#include <soc/pci_devs.h>
#include <device/pci_def.h>
#include <device/pci_type.h>
#include <device/pci_ops.h>
#include <device/smbus_host.h>
#include <soc/smbus.h>
 
int smbus_i2c_block_write(u8 addr, u8 bytes, u8 *buf)
{
        const pci_devfn_t dev = PCI_DEV(0, SMBUS_DEV, SMBUS_FUNC);
 
        u32 smbase;
        u32 smb_ctrl_reg;
        int status;
 
        /* SMBus I/O BAR */
        smbase = pci_read_config32(dev, PCI_BASE_ADDRESS_4) & 0xFFFFFFFE;
 
        /* Enable I2C_EN bit in HOSTC register */
        smb_ctrl_reg = pci_read_config32(dev, HOSTC);
        pci_write_config32(dev, HOSTC, smb_ctrl_reg | HOSTC_I2C_EN);
 
        status = do_i2c_block_write(smbase, addr, bytes, buf);
 
        /* Restore I2C_EN bit */
        pci_write_config32(dev, HOSTC, smb_ctrl_reg);
 
        return status;
}