reg_access.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#define __SIMPLE_DEVICE__
 
#include <assert.h>
#include <console/console.h>
#include <device/i2c_simple.h>
#include <soc/pci_devs.h>
#include <soc/reg_access.h>
#include "reg_access.h"
 
static uint64_t reg_read(struct reg_script_context *ctx)
{
        int ret_code;
        const struct reg_script *step;
        uint8_t value = 0;
 
        step = ctx->step;
        switch (step->id) {
        default:
                printk(BIOS_ERR, "Unknown register set (0x%08x)!\n",
                        step->id);
                ctx->display_features = REG_SCRIPT_DISPLAY_NOTHING;
                break;
 
        case GEN1_I2C_GPIO_EXP_0x20:
        case GEN1_I2C_GPIO_EXP_0x21:
        case GEN2_I2C_GPIO_EXP0:
        case GEN2_I2C_GPIO_EXP1:
        case GEN2_I2C_GPIO_EXP2:
        case GEN2_I2C_LED_PWM:
                if (ctx->display_features)
                        printk(BIOS_INFO, "I2C chip 0x%02x: ", step->id);
                ret_code = i2c_readb(0, step->id, (uint8_t)step->reg, &value);
                ASSERT(ret_code == 2);
                break;
        }
        return value;
}
 
static void reg_write(struct reg_script_context *ctx)
{
        int ret_code;
        const struct reg_script *step;
        uint8_t value;
 
        step = ctx->step;
        switch (step->id) {
        default:
                printk(BIOS_ERR, "Unknown register set (0x%08x)!\n",
                        step->id);
                ctx->display_features = REG_SCRIPT_DISPLAY_NOTHING;
                break;
 
        case GEN1_I2C_GPIO_EXP_0x20:
        case GEN1_I2C_GPIO_EXP_0x21:
        case GEN2_I2C_GPIO_EXP0:
        case GEN2_I2C_GPIO_EXP1:
        case GEN2_I2C_GPIO_EXP2:
        case GEN2_I2C_LED_PWM:
        case RMU_TEMP_REGS:
                if (ctx->display_features)
                        printk(BIOS_INFO, "I2C chip 0x%02x: ", step->id);
                value = (uint8_t)step->value;
                ret_code = i2c_writeb(0, step->id, (uint8_t)step->reg, value);
                ASSERT(ret_code == 2);
                break;
        }
}
 
const struct reg_script_bus_entry mainboard_reg_script_bus_table = {
        MAINBOARD_TYPE, reg_read, reg_write
};
 
REG_SCRIPT_BUS_ENTRY(mainboard_reg_script_bus_table);