126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Basic KB3310B Embedded Controller support for the YeeLoong 2F netbook
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*
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* Copyright (C) 2008 Lemote Inc.
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* Author: liujl <liujl@lemote.com>, 2008-04-20
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*/
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#include <linux/io.h>
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#include <linux/export.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include "ec_kb3310b.h"
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static DEFINE_SPINLOCK(index_access_lock);
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static DEFINE_SPINLOCK(port_access_lock);
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unsigned char ec_read(unsigned short addr)
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{
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unsigned char value;
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unsigned long flags;
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spin_lock_irqsave(&index_access_lock, flags);
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outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
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outb((addr & 0x00ff), EC_IO_PORT_LOW);
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value = inb(EC_IO_PORT_DATA);
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spin_unlock_irqrestore(&index_access_lock, flags);
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return value;
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}
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EXPORT_SYMBOL_GPL(ec_read);
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void ec_write(unsigned short addr, unsigned char val)
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{
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unsigned long flags;
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spin_lock_irqsave(&index_access_lock, flags);
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outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
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outb((addr & 0x00ff), EC_IO_PORT_LOW);
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outb(val, EC_IO_PORT_DATA);
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/* flush the write action */
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inb(EC_IO_PORT_DATA);
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spin_unlock_irqrestore(&index_access_lock, flags);
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}
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EXPORT_SYMBOL_GPL(ec_write);
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/*
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* This function is used for EC command writes and corresponding status queries.
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*/
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int ec_query_seq(unsigned char cmd)
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{
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int timeout;
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unsigned char status;
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&port_access_lock, flags);
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/* make chip goto reset mode */
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udelay(EC_REG_DELAY);
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outb(cmd, EC_CMD_PORT);
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udelay(EC_REG_DELAY);
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/* check if the command is received by ec */
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timeout = EC_CMD_TIMEOUT;
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status = inb(EC_STS_PORT);
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while (timeout-- && (status & (1 << 1))) {
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status = inb(EC_STS_PORT);
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udelay(EC_REG_DELAY);
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}
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spin_unlock_irqrestore(&port_access_lock, flags);
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if (timeout <= 0) {
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printk(KERN_ERR "%s: deadable error : timeout...\n", __func__);
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ret = -EINVAL;
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} else
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printk(KERN_INFO
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"(%x/%d)ec issued command %d status : 0x%x\n",
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timeout, EC_CMD_TIMEOUT - timeout, cmd, status);
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return ret;
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}
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EXPORT_SYMBOL_GPL(ec_query_seq);
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/*
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* Send query command to EC to get the proper event number
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*/
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int ec_query_event_num(void)
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{
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return ec_query_seq(CMD_GET_EVENT_NUM);
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}
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EXPORT_SYMBOL(ec_query_event_num);
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/*
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* Get event number from EC
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*
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* NOTE: This routine must follow the query_event_num function in the
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* interrupt.
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*/
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int ec_get_event_num(void)
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{
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int timeout = 100;
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unsigned char value;
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unsigned char status;
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udelay(EC_REG_DELAY);
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status = inb(EC_STS_PORT);
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udelay(EC_REG_DELAY);
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while (timeout-- && !(status & (1 << 0))) {
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status = inb(EC_STS_PORT);
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udelay(EC_REG_DELAY);
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}
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if (timeout <= 0) {
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pr_info("%s: get event number timeout.\n", __func__);
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return -EINVAL;
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}
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value = inb(EC_DAT_PORT);
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udelay(EC_REG_DELAY);
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return value;
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}
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EXPORT_SYMBOL(ec_get_event_num);
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