ec.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <arch/io.h>
#include <console/console.h>
#include <delay.h>
#include <device/device.h>
#include <device/pnp.h>
#include <pc80/keyboard.h>
 
#include "ec.h"
#include "chip.h"
 
/* helper functions from drivers/pc80/keyboard.c */
static int input_buffer_empty(u16 status_reg)
{
        u32 timeout;
        for (timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(status_reg) & KBD_IBF);
            timeout--) {
                udelay(1000);
        }
 
        if (!timeout) {
                printk(BIOS_WARNING, "EC-IT8518 Unexpected input buffer full\n");
                printk(BIOS_WARNING, "  Status (0x%x): 0x%x\n", status_reg, inb(status_reg));
        }
        return !!timeout;
}
 
static int output_buffer_full(u16 status_reg)
{
        u32 timeout;
        for (timeout = KBC_TIMEOUT_IN_MS; timeout && ((inb(status_reg)
            & KBD_OBF) == 0); timeout--) {
                udelay(1000);
        }
 
        if (!timeout) {
                printk(BIOS_INFO, "EC-IT8518 output buffer result timeout\n");
                printk(BIOS_INFO, "  Status (0x%x): 0x%x\n", status_reg, inb(status_reg));
        }
        return !!timeout;
}
 
/* The IT8518 60/64 EC registers are the same command/status IB/OB KBC pair.
 * Check status from 64 port before each command.
 *
 *  Ex. Get panel ID command C43/D77
 *  Check IBF empty. Then Write 0x43(CMD) to 0x64 Port
 *  Check IBF empty. Then Write 0x77(DATA) to 0x60 Port
 *  Check OBF set. Then Get Data(0x03:panel ID) from 0x60
 * Different commands return may or may not respond and may have multiple
 * bytes. Keep it simple for nor
 */
 
u8 ec_kbc_read_ob(void)
{
        if (!output_buffer_full(KBD_STATUS)) return 0;
        return inb(KBD_DATA);
}
 
void ec_kbc_write_cmd(u8 cmd)
{
        if (!input_buffer_empty(KBD_STATUS)) return;
        outb(cmd, KBD_COMMAND);
}
 
void ec_kbc_write_ib(u8 data)
{
        if (!input_buffer_empty(KBD_STATUS)) return;
        outb(data, KBD_DATA);
}
 
/*
 * These functions are for accessing the IT8518 device RAM space via 0x66/0x68
 */
 
u8 ec_read_ob(void)
{
        if (!output_buffer_full(EC_SC)) return 0;
        return inb(EC_DATA);
}
 
void ec_write_cmd(u8 cmd)
{
        if (!input_buffer_empty(EC_SC)) return;
        outb(cmd, EC_SC);
}
 
void ec_write_ib(u8 data)
{
        if (!input_buffer_empty(EC_SC)) return;
        outb(data, EC_DATA);
}
 
u8 ec_read(u16 addr)
{
        ec_write_cmd(RD_EC);
        ec_write_ib(addr);
        return ec_read_ob();
}
 
void ec_write(u16 addr, u8 data)
{
        ec_write_cmd(WR_EC);
        ec_write_ib(addr);
        ec_write_ib(data);
}
 
u8 ec_it8518_get_event(void)
{
        u8 cmd = 0;
        u8 status = inb(EC_SC);
        if (status & SCI_EVT) {
                ec_write_cmd(QR_EC);
                cmd = ec_read_ob();
        } else if (status & SMI_EVT) {
                ec_kbc_write_cmd(EC_KBD_SMI_EVENT);
                cmd = ec_kbc_read_ob();
        }
        return cmd;
}
 
void ec_it8518_enable_wake_events(void)
{
        /*
         * Set the bit in ECRAM that will enable the Lid switch as a wake source
         */
        u8 reg8 = ec_read(EC_WAKE_SRC_ENABLE);
        ec_write(EC_WAKE_SRC_ENABLE, reg8 | EC_LID_WAKE_ENABLE);
}
 
static void it8518_init(struct device *dev)
{
        if (!dev->enabled)
                return;
 
        printk(BIOS_DEBUG, "Quanta IT8518: Initializing keyboard.\n");
        pc_keyboard_init(NO_AUX_DEVICE);
}
 
static struct device_operations ops = {
        .init             = it8518_init,
        .read_resources   = noop_read_resources,
        .set_resources    = noop_set_resources,
};
 
static struct pnp_info pnp_dev_info[] = {
        { NULL, 0, 0, 0, }
};
 
static void enable_dev(struct device *dev)
{
        pnp_enable_devices(dev, &ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
}
 
struct chip_operations ec_quanta_it8518_ops = {
        CHIP_NAME("QUANTA IT8518 EC")
        .enable_dev = enable_dev
};