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kernel-ark/arch/arm/mach-pxa/corgi_ssp.c
Richard Purdie 50a5de4482 [PATCH] SharpSL: Abstract c7x0 specifics from Corgi SSP 
Sharp's newer range of Zaurus clamshell handhelds, the cxx00's are similar to
the c7x0 series yet different.  This patch series abstracts the differences
and generates a set of common drivers that support both series of devices.  It
then adds machine support for Spitz (SL-C3000) and Borzoi (SL-C3100).  Hooks
for Akita (SL-C1000) differences are also added.  The I2C driver for its IO
expander is the only missing piece.

This patch:

Separate out the Sharp Zaurus c7x0 series specific code from corgi_ssp.c so
that other models such as the cxx00's can share it.  Create sharpsl.h which
will be used to abstract machine/model specifics.

This enables the driver to be used by the Zaurus cxx00 series.

Signed-Off-by: Richard Purdie <rpurdie@rpsys.net>
Cc: Vojtech Pavlik <vojtech@suse.cz>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-13 08:22:31 -07:00

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/*
* SSP control code for Sharp Corgi devices
*
* Copyright (c) 2004-2005 Richard Purdie
*
* 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/sched.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>
#include <asm/arch/ssp.h>
#include <asm/arch/pxa-regs.h>
#include "sharpsl.h"
static DEFINE_SPINLOCK(corgi_ssp_lock);
static struct ssp_dev corgi_ssp_dev;
static struct ssp_state corgi_ssp_state;
static struct corgissp_machinfo *ssp_machinfo;
/*
* There are three devices connected to the SSP interface:
* 1. A touchscreen controller (TI ADS7846 compatible)
* 2. An LCD contoller (with some Backlight functionality)
* 3. A battery moinitoring IC (Maxim MAX1111)
*
* Each device uses a different speed/mode of communication.
*
* The touchscreen is very sensitive and the most frequently used
* so the port is left configured for this.
*
* Devices are selected using Chip Selects on GPIOs.
*/
/*
* ADS7846 Routines
*/
unsigned long corgi_ssp_ads7846_putget(ulong data)
{
unsigned long ret,flag;
spin_lock_irqsave(&corgi_ssp_lock, flag);
GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
ssp_write_word(&corgi_ssp_dev,data);
ret = ssp_read_word(&corgi_ssp_dev);
GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
spin_unlock_irqrestore(&corgi_ssp_lock, flag);
return ret;
}
/*
* NOTE: These functions should always be called in interrupt context
* and use the _lock and _unlock functions. They are very time sensitive.
*/
void corgi_ssp_ads7846_lock(void)
{
spin_lock(&corgi_ssp_lock);
GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
}
void corgi_ssp_ads7846_unlock(void)
{
GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
spin_unlock(&corgi_ssp_lock);
}
void corgi_ssp_ads7846_put(ulong data)
{
ssp_write_word(&corgi_ssp_dev,data);
}
unsigned long corgi_ssp_ads7846_get(void)
{
return ssp_read_word(&corgi_ssp_dev);
}
EXPORT_SYMBOL(corgi_ssp_ads7846_putget);
EXPORT_SYMBOL(corgi_ssp_ads7846_lock);
EXPORT_SYMBOL(corgi_ssp_ads7846_unlock);
EXPORT_SYMBOL(corgi_ssp_ads7846_put);
EXPORT_SYMBOL(corgi_ssp_ads7846_get);
/*
* LCD/Backlight Routines
*/
unsigned long corgi_ssp_dac_put(ulong data)
{
unsigned long flag, sscr1 = SSCR1_SPH;
spin_lock_irqsave(&corgi_ssp_lock, flag);
if (machine_is_spitz() || machine_is_akita() || machine_is_borzoi())
sscr1 = 0;
ssp_disable(&corgi_ssp_dev);
ssp_config(&corgi_ssp_dev, (SSCR0_Motorola | (SSCR0_DSS & 0x07 )), sscr1, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_lcdcon));
ssp_enable(&corgi_ssp_dev);
GPCR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon);
ssp_write_word(&corgi_ssp_dev,data);
/* Read null data back from device to prevent SSP overflow */
ssp_read_word(&corgi_ssp_dev);
GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon);
ssp_disable(&corgi_ssp_dev);
ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846));
ssp_enable(&corgi_ssp_dev);
spin_unlock_irqrestore(&corgi_ssp_lock, flag);
return 0;
}
void corgi_ssp_lcdtg_send(u8 adrs, u8 data)
{
corgi_ssp_dac_put(((adrs & 0x07) << 5) | (data & 0x1f));
}
void corgi_ssp_blduty_set(int duty)
{
corgi_ssp_lcdtg_send(0x02,duty);
}
EXPORT_SYMBOL(corgi_ssp_lcdtg_send);
EXPORT_SYMBOL(corgi_ssp_blduty_set);
/*
* Max1111 Routines
*/
int corgi_ssp_max1111_get(ulong data)
{
unsigned long flag;
int voltage,voltage1,voltage2;
spin_lock_irqsave(&corgi_ssp_lock, flag);
GPCR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111);
ssp_disable(&corgi_ssp_dev);
ssp_config(&corgi_ssp_dev, (SSCR0_Motorola | (SSCR0_DSS & 0x07 )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_max1111));
ssp_enable(&corgi_ssp_dev);
udelay(1);
/* TB1/RB1 */
ssp_write_word(&corgi_ssp_dev,data);
ssp_read_word(&corgi_ssp_dev); /* null read */
/* TB12/RB2 */
ssp_write_word(&corgi_ssp_dev,0);
voltage1=ssp_read_word(&corgi_ssp_dev);
/* TB13/RB3*/
ssp_write_word(&corgi_ssp_dev,0);
voltage2=ssp_read_word(&corgi_ssp_dev);
ssp_disable(&corgi_ssp_dev);
ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846));
ssp_enable(&corgi_ssp_dev);
GPSR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111);
spin_unlock_irqrestore(&corgi_ssp_lock, flag);
if (voltage1 & 0xc0 || voltage2 & 0x3f)
voltage = -1;
else
voltage = ((voltage1 << 2) & 0xfc) | ((voltage2 >> 6) & 0x03);
return voltage;
}
EXPORT_SYMBOL(corgi_ssp_max1111_get);
/*
* Support Routines
*/
void __init corgi_ssp_set_machinfo(struct corgissp_machinfo *machinfo)
{
ssp_machinfo = machinfo;
}
static int __init corgi_ssp_probe(struct device *dev)
{
int ret;
/* Chip Select - Disable All */
GPDR(ssp_machinfo->cs_lcdcon) |= GPIO_bit(ssp_machinfo->cs_lcdcon); /* output */
GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon); /* High - Disable LCD Control/Timing Gen */
GPDR(ssp_machinfo->cs_max1111) |= GPIO_bit(ssp_machinfo->cs_max1111); /* output */
GPSR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111); /* High - Disable MAX1111*/
GPDR(ssp_machinfo->cs_ads7846) |= GPIO_bit(ssp_machinfo->cs_ads7846); /* output */
GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); /* High - Disable ADS7846*/
ret = ssp_init(&corgi_ssp_dev,ssp_machinfo->port);
if (ret)
printk(KERN_ERR "Unable to register SSP handler!\n");
else {
ssp_disable(&corgi_ssp_dev);
ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846));
ssp_enable(&corgi_ssp_dev);
}
return ret;
}
static int corgi_ssp_remove(struct device *dev)
{
ssp_exit(&corgi_ssp_dev);
return 0;
}
static int corgi_ssp_suspend(struct device *dev, pm_message_t state, u32 level)
{
if (level == SUSPEND_POWER_DOWN) {
ssp_flush(&corgi_ssp_dev);
ssp_save_state(&corgi_ssp_dev,&corgi_ssp_state);
}
return 0;
}
static int corgi_ssp_resume(struct device *dev, u32 level)
{
if (level == RESUME_POWER_ON) {
GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon); /* High - Disable LCD Control/Timing Gen */
GPSR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111); /* High - Disable MAX1111*/
GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); /* High - Disable ADS7846*/
ssp_restore_state(&corgi_ssp_dev,&corgi_ssp_state);
ssp_enable(&corgi_ssp_dev);
}
return 0;
}
static struct device_driver corgissp_driver = {
.name = "corgi-ssp",
.bus = &platform_bus_type,
.probe = corgi_ssp_probe,
.remove = corgi_ssp_remove,
.suspend = corgi_ssp_suspend,
.resume = corgi_ssp_resume,
};
int __init corgi_ssp_init(void)
{
return driver_register(&corgissp_driver);
}
arch_initcall(corgi_ssp_init);
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