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linux/arch/mips/loongson2ef/lemote-2f/ec_kb3310b.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Basic KB3310B Embedded Controller support for the YeeLoong 2F netbook
*
* Copyright (C) 2008 Lemote Inc.
* Author: liujl <liujl@lemote.com>, 2008-04-20
*/
MIPS: Audit and remove any unnecessary uses of module.h Historically a lot of these existed because we did not have a distinction between what was modular code and what was providing support to modules via EXPORT_SYMBOL and friends. That changed when we forked out support for the latter into the export.h file. This means we should be able to reduce the usage of module.h in code that is obj-y Makefile or bool Kconfig. In the case of some code where it is modular, we can extend that to also include files that are building basic support functionality but not related to loading or registering the final module; such files also have no need whatsoever for module.h The advantage in removing such instances is that module.h itself sources about 15 other headers; adding significantly to what we feed cpp, and it can obscure what headers we are effectively using. Since module.h might have been the implicit source for init.h (for __init) and for export.h (for EXPORT_SYMBOL) we consider each instance for the presence of either and replace/add as needed. Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code. Build coverage of all the mips defconfigs revealed the module.h header was masking a couple of implicit include instances, so we add the appropriate headers there. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: David Daney <david.daney@cavium.com> Cc: John Crispin <john@phrozen.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: "Steven J. Hill" <steven.hill@cavium.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/15131/ [james.hogan@imgtec.com: Preserve sort order where it already exists] Signed-off-by: James Hogan <james.hogan@imgtec.com>
2017-01-28 19:05:57 -07:00
#include <linux/io.h>
#include <linux/export.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include "ec_kb3310b.h"
static DEFINE_SPINLOCK(index_access_lock);
static DEFINE_SPINLOCK(port_access_lock);
unsigned char ec_read(unsigned short addr)
{
unsigned char value;
unsigned long flags;
spin_lock_irqsave(&index_access_lock, flags);
outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
outb((addr & 0x00ff), EC_IO_PORT_LOW);
value = inb(EC_IO_PORT_DATA);
spin_unlock_irqrestore(&index_access_lock, flags);
return value;
}
EXPORT_SYMBOL_GPL(ec_read);
void ec_write(unsigned short addr, unsigned char val)
{
unsigned long flags;
spin_lock_irqsave(&index_access_lock, flags);
outb((addr & 0xff00) >> 8, EC_IO_PORT_HIGH);
outb((addr & 0x00ff), EC_IO_PORT_LOW);
outb(val, EC_IO_PORT_DATA);
/* flush the write action */
inb(EC_IO_PORT_DATA);
spin_unlock_irqrestore(&index_access_lock, flags);
}
EXPORT_SYMBOL_GPL(ec_write);
/*
* This function is used for EC command writes and corresponding status queries.
*/
int ec_query_seq(unsigned char cmd)
{
int timeout;
unsigned char status;
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&port_access_lock, flags);
/* make chip goto reset mode */
udelay(EC_REG_DELAY);
outb(cmd, EC_CMD_PORT);
udelay(EC_REG_DELAY);
/* check if the command is received by ec */
timeout = EC_CMD_TIMEOUT;
status = inb(EC_STS_PORT);
while (timeout-- && (status & (1 << 1))) {
status = inb(EC_STS_PORT);
udelay(EC_REG_DELAY);
}
spin_unlock_irqrestore(&port_access_lock, flags);
if (timeout <= 0) {
printk(KERN_ERR "%s: deadable error : timeout...\n", __func__);
ret = -EINVAL;
} else
printk(KERN_INFO
"(%x/%d)ec issued command %d status : 0x%x\n",
timeout, EC_CMD_TIMEOUT - timeout, cmd, status);
return ret;
}
EXPORT_SYMBOL_GPL(ec_query_seq);
/*
* Send query command to EC to get the proper event number
*/
int ec_query_event_num(void)
{
return ec_query_seq(CMD_GET_EVENT_NUM);
}
EXPORT_SYMBOL(ec_query_event_num);
/*
* Get event number from EC
*
* NOTE: This routine must follow the query_event_num function in the
* interrupt.
*/
int ec_get_event_num(void)
{
int timeout = 100;
unsigned char value;
unsigned char status;
udelay(EC_REG_DELAY);
status = inb(EC_STS_PORT);
udelay(EC_REG_DELAY);
while (timeout-- && !(status & (1 << 0))) {
status = inb(EC_STS_PORT);
udelay(EC_REG_DELAY);
}
if (timeout <= 0) {
pr_info("%s: get event number timeout.\n", __func__);
return -EINVAL;
}
value = inb(EC_DAT_PORT);
udelay(EC_REG_DELAY);
return value;
}
EXPORT_SYMBOL(ec_get_event_num);