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/*
* arch/arm/mach-sa1100/jornada720_mcu.c
*
* HP Jornada 720 Microprocessor Control Unit driver
*
* Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
* Copyright (C) 2005 Michael Gernoth <michael@gernoth.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <asm/hardware.h>
#include <asm/arch/jornada720_mcu.h>
/* TODO:
* when CONFIG_SA1100_SSP will be definable and ssp header will be present,
* CONFIG_SA1100_SSP should be added to this module's dependencies and this
* include should be removed in favour of ssp header file
*/
#include "ssp.c"
MODULE_AUTHOR("Filip Zyzniewski <filip.zyzniewski@tefnet.pl>");
MODULE_DESCRIPTION("HP Jornada 720 Microprocessor Controller Unit driver");
MODULE_LICENSE("GPL");
/*
* HP Documentation referred in this file:
* http://www.jlime.com/downloads/development/docs/jornada7xx/jornada720.txt
*/
/*
* we have to lock to avoid starting
* second transmission during one taking place
*/
static spinlock_t jornada720_mcu_lock = SPIN_LOCK_UNLOCKED;
static unsigned long jornada720_mcu_flags;
u8 inline jornada720_mcu_reverse(u8 x)
{
/* byte ghijklmn becomes nmlkjihg (line 205 of HP's doc) */
return
((0x80 & x) >> 7) |
((0x40 & x) >> 5) |
((0x20 & x) >> 3) |
((0x10 & x) >> 1) |
((0x08 & x) << 1) |
((0x04 & x) << 3) |
((0x02 & x) << 5) |
((0x01 & x) << 7) ;
}
int jornada720_mcu_byte(u8 byte)
{
u16 ret;
int timeout = 400000;
/* wating for GPIO 10 to go low (line 197 of HP's doc) */
while ((GPLR & GPIO_GPIO10)) {
if (!--timeout) {
printk("jornada720_mcu_byte ret -ETIMEDOUT\n");
return -ETIMEDOUT;
}
cpu_relax();
}
ret=jornada720_mcu_reverse(byte) << 8;
ssp_write_word(ret);
ssp_read_word(&ret);
return jornada720_mcu_reverse(ret);
}
EXPORT_SYMBOL(jornada720_mcu_byte);
/*
* WARNING: remember to jornada720_mcu_end() after every
* jornada720_mcu_start() or you will deadlock!
*/
int jornada720_mcu_start(u8 byte)
{
int i;
/* we don't want other access to the MCU now */
spin_lock_irqsave(&jornada720_mcu_lock, jornada720_mcu_flags);
/* clear to enable MCU (line 194 of HP's doc) */
GPCR = GPIO_GPIO25;
/* we should always get TxDummy after first request */
if (jornada720_mcu_byte(byte) != jornada720_mcu_TxDummy)
{
printk(KERN_WARNING "jornada720_mcu: leftover MCU data, flushing\n");
for (i = 0; i < 256; i++)
if (jornada720_mcu_read() == -1)
break;
return -1;
}
return 0;
}
EXPORT_SYMBOL(jornada720_mcu_start);
void jornada720_mcu_end(void)
{
/* end of transmission (line 203 of HP's doc) */
GPSR = GPIO_GPIO25;
spin_unlock_irqrestore(&jornada720_mcu_lock, jornada720_mcu_flags);
}
EXPORT_SYMBOL(jornada720_mcu_end);
/* Jornada 720 devices accessed by the MCU */
static struct device jornada720_mcu_bus_devices[] = {
/* keyboard */
{ .bus_id = jornada720_mcu_bus_id_kbd },
/* touchscreen */
{ .bus_id = jornada720_mcu_bus_id_ts },
/* apm (batteries) */
{ .bus_id = jornada720_mcu_bus_id_apm },
/* backlight */
{ .bus_id = jornada720_mcu_bus_id_bl },
/* lcd display */
{ .bus_id = jornada720_mcu_bus_id_lcd },
};
static int jornada720_mcu_bus_match(struct device *dev, struct device_driver *drv)
{
return ! strcmp(dev->bus_id, drv->name);
}
struct bus_type jornada720_mcu_bus_type = {
.name = "jornada720_mcu_bus",
.match = jornada720_mcu_bus_match,
};
EXPORT_SYMBOL(jornada720_mcu_bus_type);
void jornada720_mcu_bus_device_release(struct device *dev)
{
/*
* those device structures are static, so we don't
* have anything to free
*/
}
static int __init jornada720_mcu_probe(struct platform_device *dev)
{
int ret, i;
/* we don't want any data yet (line 203 of HP's doc) */
GPSR = GPIO_GPIO25;
ret=ssp_init();
if (ret)
return ret;
/* initialization of MCU serial interface (line 182 of HP's doc) */
Ser4MCCR0 = 0;
Ser4SSCR0 = 0x0387;
Ser4SSCR1 = 0x18;
ssp_flush();
/* test of MCU presence */
ret = jornada720_mcu_start(jornada720_mcu_GetBrightness);
if(!ret) jornada720_mcu_read();
jornada720_mcu_end();
if(ret < 0) {
ssp_exit();
return -ENODEV;
}
/* registering devices accessible through this bus */
for(i=0; i<ARRAY_SIZE(jornada720_mcu_bus_devices); i++) {
jornada720_mcu_bus_devices[i].bus = &jornada720_mcu_bus_type;
jornada720_mcu_bus_devices[i].parent = &(dev->dev);
jornada720_mcu_bus_devices[i].release = jornada720_mcu_bus_device_release;
ret = device_register(jornada720_mcu_bus_devices + i);
if (ret)
break;
}
if (ret) {
for(; i <= 0; i--) {
device_unregister(jornada720_mcu_bus_devices + i);
}
ssp_exit();
}
return ret;
}
static int jornada720_mcu_remove(struct platform_device *dev)
{
int i;
for(i=0; i<ARRAY_SIZE(jornada720_mcu_bus_devices); i++)
device_unregister(jornada720_mcu_bus_devices + i);
/* we don't want data anymore (line 203 of HP's doc) */
GPSR = GPIO_GPIO25;
ssp_exit();
return 0;
}
struct platform_driver jornada720_mcu_driver = {
.probe = jornada720_mcu_probe,
.remove = jornada720_mcu_remove,
.driver = {
.name = "jornada720_mcu",
},
};
static int __init jornada720_mcu_init(void) {
int ret = bus_register(&jornada720_mcu_bus_type);
if (!ret)
return platform_driver_register(&jornada720_mcu_driver);
return ret;
}
static void __exit jornada720_mcu_exit(void) {
bus_unregister(&jornada720_mcu_bus_type);
platform_driver_unregister(&jornada720_mcu_driver);
}
module_init(jornada720_mcu_init);
module_exit(jornada720_mcu_exit);
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