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linux/arch/arm/mach-pxa/corgi_ssp.c
Russell King 9480e307cd [PATCH] DRIVER MODEL: Get rid of the obsolete tri-level suspend/resume callbacks 
In PM v1, all devices were called at SUSPEND_DISABLE level.  Then
all devices were called at SUSPEND_SAVE_STATE level, and finally
SUSPEND_POWER_DOWN level.  However, with PM v2, to maintain
compatibility for platform devices, I arranged for the PM v2
suspend/resume callbacks to call the old PM v1 suspend/resume
callbacks three times with each level in order so that existing
drivers continued to work.

Since this is obsolete infrastructure which is no longer necessary,
we can remove it.  Here's an (untested) patch to do exactly that.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-10-28 09:52:56 -07:00

259 lines
6.9 KiB
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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)
{
ssp_flush(&corgi_ssp_dev);
ssp_save_state(&corgi_ssp_dev,&corgi_ssp_state);
return 0;
}
static int corgi_ssp_resume(struct device *dev)
{
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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