ec_oem.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <arch/io.h>
#include <delay.h>
#include <ec/acpi/ec.h>
#include "ec_oem.h"
 
int send_ec_oem_command(u8 command)
{
        int timeout;
 
        timeout = 0x7ff;
        while ((inb(EC_OEM_SC) & EC_IBF) && --timeout) {
                udelay(10);
                if ((timeout & 0xff) == 0)
                        printk(BIOS_SPEW, ".");
        }
        if (!timeout) {
                printk(BIOS_DEBUG, "Timeout while sending OEM command 0x%02x to EC!\n",
                                command);
                // return -1;
        }
 
        outb(command, EC_OEM_SC);
        return 0;
}
 
int send_ec_oem_data(u8 data)
{
        int timeout;
 
        timeout = 0x7ff;
        while ((inb(EC_OEM_SC) & EC_IBF) && --timeout) { // wait for IBF = 0
                udelay(10);
                if ((timeout & 0xff) == 0)
                        printk(BIOS_SPEW, ".");
        }
        if (!timeout) {
                printk(BIOS_DEBUG, "Timeout while sending OEM data 0x%02x to EC!\n",
                                data);
                // return -1;
        }
 
        outb(data, EC_OEM_DATA);
 
        return 0;
}
 
int send_ec_oem_data_nowait(u8 data)
{
        outb(data, EC_OEM_DATA);
 
        return 0;
}
 
u8 recv_ec_oem_data(void)
{
        int timeout;
        u8 data;
 
        timeout = 0x7fff;
        while (--timeout) { // Wait for OBF = 1
                if (inb(EC_OEM_SC) & EC_OBF) {
                        break;
                }
                udelay(10);
                if ((timeout & 0xff) == 0)
                        printk(BIOS_SPEW, ".");
        }
        if (!timeout) {
                printk(BIOS_DEBUG, "\nTimeout while receiving OEM data from EC!\n");
                // return -1;
        }
 
        data = inb(EC_OEM_DATA);
        // printk(BIOS_SPEW, "recv_ec_oem_data: 0x%02x\n", data);
 
        return data;
}
 
u8 ec_oem_read(u8 addr)
{
        send_ec_oem_command(0x80);
        send_ec_oem_data(addr);
 
        return recv_ec_oem_data();
}
 
int ec_oem_write(u8 addr, u8 data)
{
        send_ec_oem_command(0x81);
        send_ec_oem_data(addr);
        return send_ec_oem_data(data);
}
 
int ec_oem_dump_status(void)
{
        u8 ec_sc = inb(EC_OEM_SC);
        printk(BIOS_DEBUG, "Embedded Controller Status: ");
        if (ec_sc & (1 << 6)) printk(BIOS_DEBUG, "SMI_EVT ");
        if (ec_sc & (1 << 5)) printk(BIOS_DEBUG, "SCI_EVT ");
        if (ec_sc & (1 << 4)) printk(BIOS_DEBUG, "BURST ");
        if (ec_sc & (1 << 3)) printk(BIOS_DEBUG, "CMD ");
        if (ec_sc & (1 << 1)) printk(BIOS_DEBUG, "IBF ");
        if (ec_sc & (1 << 0)) printk(BIOS_DEBUG, "OBF ");
        printk(BIOS_DEBUG, "\n");
 
        return ec_sc;
}