mirror of https://gitee.com/openkylin/linux.git
277 lines
7.3 KiB
C
277 lines
7.3 KiB
C
/*
|
|
* 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/platform_device.h>
|
|
#include <asm/hardware.h>
|
|
#include <asm/mach-types.h>
|
|
|
|
#include <asm/arch/ssp.h>
|
|
#include <asm/arch/pxa-regs.h>
|
|
#include <asm/arch/pxa2xx-gpio.h>
|
|
#include <asm/arch/regs-ssp.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 controller (with some Backlight functionality)
|
|
* 3. A battery monitoring 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 flag;
|
|
u32 ret = 0;
|
|
|
|
spin_lock_irqsave(&corgi_ssp_lock, flag);
|
|
if (ssp_machinfo->cs_ads7846 >= 0)
|
|
GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
|
|
|
|
ssp_write_word(&corgi_ssp_dev,data);
|
|
ssp_read_word(&corgi_ssp_dev, &ret);
|
|
|
|
if (ssp_machinfo->cs_ads7846 >= 0)
|
|
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);
|
|
if (ssp_machinfo->cs_ads7846 >= 0)
|
|
GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);
|
|
}
|
|
|
|
void corgi_ssp_ads7846_unlock(void)
|
|
{
|
|
if (ssp_machinfo->cs_ads7846 >= 0)
|
|
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)
|
|
{
|
|
u32 ret = 0;
|
|
ssp_read_word(&corgi_ssp_dev, &ret);
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
u32 tmp;
|
|
|
|
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);
|
|
|
|
if (ssp_machinfo->cs_lcdcon >= 0)
|
|
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, &tmp);
|
|
if (ssp_machinfo->cs_lcdcon >= 0)
|
|
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;
|
|
long voltage = 0, voltage1 = 0, voltage2 = 0;
|
|
|
|
spin_lock_irqsave(&corgi_ssp_lock, flag);
|
|
if (ssp_machinfo->cs_max1111 >= 0)
|
|
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, (u32*)&voltage1); /* null read */
|
|
|
|
/* TB12/RB2 */
|
|
ssp_write_word(&corgi_ssp_dev,0);
|
|
ssp_read_word(&corgi_ssp_dev, (u32*)&voltage1);
|
|
|
|
/* TB13/RB3*/
|
|
ssp_write_word(&corgi_ssp_dev,0);
|
|
ssp_read_word(&corgi_ssp_dev, (u32*)&voltage2);
|
|
|
|
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);
|
|
if (ssp_machinfo->cs_max1111 >= 0)
|
|
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 platform_device *dev)
|
|
{
|
|
int ret;
|
|
|
|
/* Chip Select - Disable All */
|
|
if (ssp_machinfo->cs_lcdcon >= 0)
|
|
pxa_gpio_mode(ssp_machinfo->cs_lcdcon | GPIO_OUT | GPIO_DFLT_HIGH);
|
|
if (ssp_machinfo->cs_max1111 >= 0)
|
|
pxa_gpio_mode(ssp_machinfo->cs_max1111 | GPIO_OUT | GPIO_DFLT_HIGH);
|
|
if (ssp_machinfo->cs_ads7846 >= 0)
|
|
pxa_gpio_mode(ssp_machinfo->cs_ads7846 | GPIO_OUT | GPIO_DFLT_HIGH);
|
|
|
|
ret = ssp_init(&corgi_ssp_dev, ssp_machinfo->port, 0);
|
|
|
|
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 platform_device *dev)
|
|
{
|
|
ssp_exit(&corgi_ssp_dev);
|
|
return 0;
|
|
}
|
|
|
|
static int corgi_ssp_suspend(struct platform_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 platform_device *dev)
|
|
{
|
|
if (ssp_machinfo->cs_lcdcon >= 0)
|
|
GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon); /* High - Disable LCD Control/Timing Gen */
|
|
if (ssp_machinfo->cs_max1111 >= 0)
|
|
GPSR(ssp_machinfo->cs_max1111) = GPIO_bit(ssp_machinfo->cs_max1111); /* High - Disable MAX1111*/
|
|
if (ssp_machinfo->cs_ads7846 >= 0)
|
|
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 platform_driver corgissp_driver = {
|
|
.probe = corgi_ssp_probe,
|
|
.remove = corgi_ssp_remove,
|
|
.suspend = corgi_ssp_suspend,
|
|
.resume = corgi_ssp_resume,
|
|
.driver = {
|
|
.name = "corgi-ssp",
|
|
},
|
|
};
|
|
|
|
int __init corgi_ssp_init(void)
|
|
{
|
|
return platform_driver_register(&corgissp_driver);
|
|
}
|
|
|
|
arch_initcall(corgi_ssp_init);
|