i2c.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <amdblocks/acpimmio.h>
#include <amdblocks/i2c.h>
#include <soc/i2c.h>
#include <soc/iomap.h>
#include <soc/pci_devs.h>
#include <soc/southbridge.h>
#include "chip.h"
 
#if ENV_X86
/* Preferably keep all the I2C controllers operating in a specific mode together. */
static const struct soc_i2c_ctrlr_info i2c_ctrlr[I2C_CTRLR_COUNT] = {
        { I2C_MASTER_MODE, 0, "" },
        { I2C_MASTER_MODE, 0, "" },
        { I2C_MASTER_MODE, APU_I2C2_BASE, "I2C2" },
        { I2C_MASTER_MODE, APU_I2C3_BASE, "I2C3" },
        { I2C_PERIPHERAL_MODE, APU_I2C4_BASE, "I2C4" } /* Can only be used in peripheral mode */
};
#else
static struct soc_i2c_ctrlr_info i2c_ctrlr[I2C_CTRLR_COUNT] = {
        { I2C_MASTER_MODE, 0, ""},
        { I2C_MASTER_MODE, 0, "" },
        { I2C_MASTER_MODE, 0, "" },
        { I2C_MASTER_MODE, 0, "" },
        { I2C_PERIPHERAL_MODE, 0, "" },
};
 
void i2c_set_bar(unsigned int bus, uintptr_t bar)
{
        if (bus >= ARRAY_SIZE(i2c_ctrlr)) {
                printk(BIOS_ERR, "i2c index out of bounds: %u.", bus);
                return;
        }
 
        i2c_ctrlr[bus].bar = bar;
}
#endif
 
void soc_i2c_misc_init(unsigned int bus, const struct dw_i2c_bus_config *cfg)
{
        /* TODO: Picasso supports I2C RX pad configurations 3.3V, 1.8V and off, so make this
           configurable. */
        const struct i2c_pad_control ctrl = {
                .rx_level = I2C_PAD_RX_3_3V,
        };
 
        fch_i2c_pad_init(bus, cfg->speed, &ctrl);
}
 
const struct soc_i2c_ctrlr_info *soc_get_i2c_ctrlr_info(size_t *num_ctrlrs)
{
        *num_ctrlrs = ARRAY_SIZE(i2c_ctrlr);
        return i2c_ctrlr;
}
 
const struct dw_i2c_bus_config *soc_get_i2c_bus_config(size_t *num_buses)
{
        const struct soc_amd_picasso_config *config = config_of_soc();
 
        *num_buses = ARRAY_SIZE(config->i2c);
        return config->i2c;
}