[ARM] 4506/1: HP Jornada 7XX: Addition of SSP Platform Driver
These patches add full SSP/MCU support for the HP Jornada 720 machine. Its needed to handle keyboard, touchscreen, battery and backlight/lcd. The main driver exports functions and the header file exports the command values. When talking to the MCU the general procedure is to start MCU, send command (using ssp_inout(command)), the proper reply is always TXDUMMY. After receiving TXDUMMY you can send the value you wish pushed (for example brightness level). End with ssp_end() so the spinlock gets unlocked. Drivers using this havent been implemented yet, but will shortly. Signed-off-by: Kristoffer Ericson <Kristoffer.ericson@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Kristoffer Ericson
Russell King
Родитель
7b4c965a0b
Коммит
69ebb22277
|
|
@ -101,6 +101,16 @@ config SA1100_JORNADA720
|
|||
handheld computer. See <http://www.hp.com/jornada/products/720>
|
||||
for details.
|
||||
|
||||
config SA1100_JORNADA720_SSP
|
||||
bool "HP Jornada 720 Extended SSP driver"
|
||||
select SA1100_SSP
|
||||
depends on SA1100_JORNADA720
|
||||
help
|
||||
Say Y here if you have a HP Jornada 7xx handheld computer and you
|
||||
want to access devices connected to the MCU. Those include the
|
||||
keyboard, touchscreen, backlight and battery. This driver also activates
|
||||
the generic SSP which it extends.
|
||||
|
||||
config SA1100_HACKKIT
|
||||
bool "HackKit Core CPU Board"
|
||||
help
|
||||
|
|
@ -145,8 +155,7 @@ config SA1100_SSP
|
|||
help
|
||||
Say Y here to enable support for the generic PIO SSP driver.
|
||||
This isn't for audio support, but for attached sensors and
|
||||
other devices, eg for BadgePAD 4 sensor support, or Jornada
|
||||
720 touchscreen support.
|
||||
other devices, eg for BadgePAD 4 sensor support.
|
||||
|
||||
config H3600_SLEEVE
|
||||
tristate "Compaq iPAQ Handheld sleeve support"
|
||||
|
|
|
|||
|
|
@ -31,6 +31,7 @@ obj-$(CONFIG_SA1100_HACKKIT) += hackkit.o
|
|||
led-$(CONFIG_SA1100_HACKKIT) += leds-hackkit.o
|
||||
|
||||
obj-$(CONFIG_SA1100_JORNADA720) += jornada720.o
|
||||
obj-$(CONFIG_SA1100_JORNADA720_SSP) += jornada720_ssp.o
|
||||
|
||||
obj-$(CONFIG_SA1100_LART) += lart.o
|
||||
led-$(CONFIG_SA1100_LART) += leds-lart.o
|
||||
|
|
@ -51,3 +52,4 @@ obj-$(CONFIG_LEDS) += $(led-y)
|
|||
# Miscelaneous functions
|
||||
obj-$(CONFIG_PM) += pm.o sleep.o
|
||||
obj-$(CONFIG_SA1100_SSP) += ssp.o
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,201 @@
|
|||
/**
|
||||
* arch/arm/mac-sa1100/jornada720_ssp.c
|
||||
*
|
||||
* Copyright (C) 2006/2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
|
||||
* Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* SSP driver for the HP Jornada 710/720/728
|
||||
*/
|
||||
|
||||
#include <linux/delay.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
#include <asm/hardware.h>
|
||||
#include <asm/hardware/ssp.h>
|
||||
#include <asm/arch/jornada720.h>
|
||||
|
||||
static DEFINE_SPINLOCK(jornada_ssp_lock);
|
||||
static unsigned long jornada_ssp_flags;
|
||||
|
||||
/**
|
||||
* jornada_ssp_reverse - reverses input byte
|
||||
*
|
||||
* we need to reverse all data we recieve from the mcu due to its physical location
|
||||
* returns : 01110111 -> 11101110
|
||||
*/
|
||||
u8 inline jornada_ssp_reverse(u8 byte)
|
||||
{
|
||||
return
|
||||
((0x80 & byte) >> 7) |
|
||||
((0x40 & byte) >> 5) |
|
||||
((0x20 & byte) >> 3) |
|
||||
((0x10 & byte) >> 1) |
|
||||
((0x08 & byte) << 1) |
|
||||
((0x04 & byte) << 3) |
|
||||
((0x02 & byte) << 5) |
|
||||
((0x01 & byte) << 7);
|
||||
};
|
||||
EXPORT_SYMBOL(jornada_ssp_reverse);
|
||||
|
||||
/**
|
||||
* jornada_ssp_byte - waits for ready ssp bus and sends byte
|
||||
*
|
||||
* waits for fifo buffer to clear and then transmits, if it doesn't then we will
|
||||
* timeout after <timeout> rounds. Needs mcu running before its called.
|
||||
*
|
||||
* returns : %mcu output on success
|
||||
* : %-ETIMEOUT on timeout
|
||||
*/
|
||||
int jornada_ssp_byte(u8 byte)
|
||||
{
|
||||
int timeout = 400000;
|
||||
u16 ret;
|
||||
|
||||
while ((GPLR & GPIO_GPIO10)) {
|
||||
if (!--timeout) {
|
||||
printk(KERN_WARNING "SSP: timeout while waiting for transmit\n");
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
cpu_relax();
|
||||
}
|
||||
|
||||
ret = jornada_ssp_reverse(byte) << 8;
|
||||
|
||||
ssp_write_word(ret);
|
||||
ssp_read_word(&ret);
|
||||
|
||||
return jornada_ssp_reverse(ret);
|
||||
};
|
||||
EXPORT_SYMBOL(jornada_ssp_byte);
|
||||
|
||||
/**
|
||||
* jornada_ssp_inout - decide if input is command or trading byte
|
||||
*
|
||||
* returns : (jornada_ssp_byte(byte)) on success
|
||||
* : %-ETIMEOUT on timeout failure
|
||||
*/
|
||||
int jornada_ssp_inout(u8 byte)
|
||||
{
|
||||
int ret, i;
|
||||
|
||||
/* true means command byte */
|
||||
if (byte != TXDUMMY) {
|
||||
ret = jornada_ssp_byte(byte);
|
||||
/* Proper return to commands is TxDummy */
|
||||
if (ret != TXDUMMY) {
|
||||
for (i = 0; i < 256; i++)/* flushing bus */
|
||||
if (jornada_ssp_byte(TXDUMMY) == -1)
|
||||
break;
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
} else /* Exchange TxDummy for data */
|
||||
ret = jornada_ssp_byte(TXDUMMY);
|
||||
|
||||
return ret;
|
||||
};
|
||||
EXPORT_SYMBOL(jornada_ssp_inout);
|
||||
|
||||
/**
|
||||
* jornada_ssp_start - enable mcu
|
||||
*
|
||||
*/
|
||||
int jornada_ssp_start()
|
||||
{
|
||||
spin_lock_irqsave(&jornada_ssp_lock, jornada_ssp_flags);
|
||||
GPCR = GPIO_GPIO25;
|
||||
udelay(50);
|
||||
return 0;
|
||||
};
|
||||
EXPORT_SYMBOL(jornada_ssp_start);
|
||||
|
||||
/**
|
||||
* jornada_ssp_end - disable mcu and turn off lock
|
||||
*
|
||||
*/
|
||||
int jornada_ssp_end()
|
||||
{
|
||||
GPSR = GPIO_GPIO25;
|
||||
spin_unlock_irqrestore(&jornada_ssp_lock, jornada_ssp_flags);
|
||||
return 0;
|
||||
};
|
||||
EXPORT_SYMBOL(jornada_ssp_end);
|
||||
|
||||
static int __init jornada_ssp_probe(struct platform_device *dev)
|
||||
{
|
||||
int ret;
|
||||
|
||||
GPSR = GPIO_GPIO25;
|
||||
|
||||
ret = ssp_init();
|
||||
|
||||
/* worked fine, lets not bother with anything else */
|
||||
if (!ret) {
|
||||
printk(KERN_INFO "SSP: device initialized with irq\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
printk(KERN_WARNING "SSP: initialization failed, trying non-irq solution \n");
|
||||
|
||||
/* init of Serial 4 port */
|
||||
Ser4MCCR0 = 0;
|
||||
Ser4SSCR0 = 0x0387;
|
||||
Ser4SSCR1 = 0x18;
|
||||
|
||||
/* clear out any left over data */
|
||||
ssp_flush();
|
||||
|
||||
/* enable MCU */
|
||||
jornada_ssp_start();
|
||||
|
||||
/* see if return value makes sense */
|
||||
ret = jornada_ssp_inout(GETBRIGHTNESS);
|
||||
|
||||
/* seems like it worked, just feed it with TxDummy to get rid of data */
|
||||
if (ret == TxDummy)
|
||||
jornada_ssp_inout(TXDUMMY);
|
||||
|
||||
jornada_ssp_end();
|
||||
|
||||
/* failed, lets just kill everything */
|
||||
if (ret == -ETIMEDOUT) {
|
||||
printk(KERN_WARNING "SSP: attempts failed, bailing\n");
|
||||
ssp_exit();
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* all fine */
|
||||
printk(KERN_INFO "SSP: device initialized\n");
|
||||
return 0;
|
||||
};
|
||||
|
||||
static int jornada_ssp_remove(struct platform_device *dev)
|
||||
{
|
||||
/* Note that this doesnt actually remove the driver, since theres nothing to remove
|
||||
* It just makes sure everything is turned off */
|
||||
GPSR = GPIO_GPIO25;
|
||||
ssp_exit();
|
||||
return 0;
|
||||
};
|
||||
|
||||
struct platform_driver jornadassp_driver = {
|
||||
.probe = jornada_ssp_probe,
|
||||
.remove = jornada_ssp_remove,
|
||||
.driver = {
|
||||
.name = "jornada_ssp",
|
||||
},
|
||||
};
|
||||
|
||||
static int __init jornada_ssp_init(void)
|
||||
{
|
||||
return platform_driver_register(&jornadassp_driver);
|
||||
}
|
||||
|
|
@ -0,0 +1,27 @@
|
|||
/*
|
||||
* include/asm-arm/arch-sa1100/jornada720.h
|
||||
*
|
||||
* This file contains SSP/MCU communication definitions for HP Jornada 710/720/728
|
||||
*
|
||||
* Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
|
||||
* Copyright (C) 2000 John Ankcorn <jca@lcs.mit.edu>
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
*/
|
||||
|
||||
/* HP Jornada 7xx microprocessor commands */
|
||||
#define GETBATTERYDATA 0xc0
|
||||
#define GETSCANKEYCODE 0x90
|
||||
#define GETTOUCHSAMPLES 0xa0
|
||||
#define GETCONTRAST 0xD0
|
||||
#define SETCONTRAST 0xD1
|
||||
#define GETBRIGHTNESS 0xD2
|
||||
#define SETBRIGHTNESS 0xD3
|
||||
#define CONTRASTOFF 0xD8
|
||||
#define BRIGHTNESSOFF 0xD9
|
||||
#define PWMOFF 0xDF
|
||||
#define TXDUMMY 0x11
|
||||
#define ERRORCODE 0x00
|
||||
Загрузка…
Ссылка в новой задаче