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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2011 by amaury Pouly
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "kernel.h"
#include "system.h"
#include "gcc_extensions.h"
#include "system-target.h"
#include "cpu.h"
#include "clkctrl-imx233.h"
#include "pinctrl-imx233.h"
#include "timrot-imx233.h"
#include "lcd.h"
#include "backlight-target.h"
#define HW_POWER_BASE 0x80044000
#define HW_POWER_RESET (*(volatile uint32_t *)(HW_POWER_BASE + 0x100))
#define HW_POWER_RESET__UNLOCK 0x3E770000
#define HW_POWER_RESET__PWD 0x1
#define HW_ICOLL_BASE 0x80000000
#define HW_ICOLL_VECTOR (*(volatile uint32_t *)(HW_ICOLL_BASE + 0x0))
#define HW_ICOLL_LEVELACK (*(volatile uint32_t *)(HW_ICOLL_BASE + 0x10))
#define HW_ICOLL_LEVELACK__LEVEL0 0x1
#define HW_ICOLL_CTRL (*(volatile uint32_t *)(HW_ICOLL_BASE + 0x20))
#define HW_ICOLL_CTRL__IRQ_FINAL_ENABLE (1 << 16)
#define HW_ICOLL_CTRL__ARM_RSE_MODE (1 << 18)
#define HW_ICOLL_VBASE (*(volatile uint32_t *)(HW_ICOLL_BASE + 0x40))
#define HW_ICOLL_INTERRUPT(i) (*(volatile uint32_t *)(HW_ICOLL_BASE + 0x120 + (i) * 0x10))
#define HW_ICOLL_INTERRUPT__PRIORITY_BM 0x3
#define HW_ICOLL_INTERRUPT__ENABLE 0x4
#define HW_ICOLL_INTERRUPT__SOFTIRQ 0x8
#define HW_ICOLL_INTERRUPT__ENFIQ 0x10
#define default_interrupt(name) \
extern __attribute__((weak, alias("UIRQ"))) void name(void)
static void UIRQ (void) __attribute__((interrupt ("IRQ")));
void irq_handler(void) __attribute__((interrupt("IRQ")));
void fiq_handler(void) __attribute__((interrupt("FIQ")));
default_interrupt(INT_USB_CTRL);
default_interrupt(INT_TIMER0);
default_interrupt(INT_TIMER1);
default_interrupt(INT_TIMER2);
default_interrupt(INT_TIMER3);
default_interrupt(INT_LCDIF_DMA);
default_interrupt(INT_LCDIF_ERROR);
typedef void (*isr_t)(void);
static isr_t isr_table[INT_SRC_NR_SOURCES] =
{
[INT_SRC_USB_CTRL] = INT_USB_CTRL,
[INT_SRC_TIMER(0)] = INT_TIMER0,
[INT_SRC_TIMER(1)] = INT_TIMER1,
[INT_SRC_TIMER(2)] = INT_TIMER2,
[INT_SRC_TIMER(3)] = INT_TIMER3,
[INT_SRC_LCDIF_DMA] = INT_LCDIF_DMA,
[INT_SRC_LCDIF_ERROR] = INT_LCDIF_ERROR,
};
static void UIRQ(void)
{
panicf("Unhandled IRQ %02X",
(unsigned int)(HW_ICOLL_VECTOR - (uint32_t)isr_table) / 4);
}
void irq_handler(void)
{
HW_ICOLL_VECTOR = HW_ICOLL_VECTOR; /* notify icoll that we entered ISR */
(*(isr_t *)HW_ICOLL_VECTOR)();
/* acknowledge completion of IRQ (all use the same priority 0 */
HW_ICOLL_LEVELACK = HW_ICOLL_LEVELACK__LEVEL0;
}
void fiq_handler(void)
{
}
static void imx233_chip_reset(void)
{
HW_CLKCTRL_RESET = HW_CLKCTRL_RESET_CHIP;
}
void system_reboot(void)
{
_backlight_off();
disable_irq();
/* use watchdog to reset */
imx233_chip_reset();
while(1);
}
void system_exception_wait(void)
{
/* what is this supposed to do ? */
}
void imx233_enable_interrupt(int src, bool enable)
{
if(enable)
__REG_SET(HW_ICOLL_INTERRUPT(src)) = HW_ICOLL_INTERRUPT__ENABLE;
else
__REG_CLR(HW_ICOLL_INTERRUPT(src)) = HW_ICOLL_INTERRUPT__ENABLE;
}
void imx233_softirq(int src, bool enable)
{
if(enable)
__REG_SET(HW_ICOLL_INTERRUPT(src)) = HW_ICOLL_INTERRUPT__SOFTIRQ;
else
__REG_CLR(HW_ICOLL_INTERRUPT(src)) = HW_ICOLL_INTERRUPT__SOFTIRQ;
}
void system_init(void)
{
/* disable all interrupts */
for(int i = 0; i < INT_SRC_NR_SOURCES; i++)
{
/* priority = 0, disable, disable fiq */
HW_ICOLL_INTERRUPT(i) = 0;
}
/* setup vbase as isr_table */
HW_ICOLL_VBASE = (uint32_t)&isr_table;
/* enable final irq bit */
__REG_SET(HW_ICOLL_CTRL) = HW_ICOLL_CTRL__IRQ_FINAL_ENABLE;
imx233_pinctrl_init();
imx233_timrot_init();
}
void power_off(void)
{
/* power down */
HW_POWER_RESET = HW_POWER_RESET__UNLOCK | HW_POWER_RESET__PWD;
while(1);
}
bool imx233_us_elapsed(uint32_t ref, unsigned us_delay)
{
uint32_t cur = HW_DIGCTL_MICROSECONDS;
if(ref + us_delay <= ref)
return !(cur > ref) && !(cur < (ref + us_delay));
else
return (cur < ref) || cur >= (ref + us_delay);
}
void imx233_reset_block(volatile uint32_t *block_reg)
{
__REG_CLR(*block_reg) = __BLOCK_SFTRST;
while(*block_reg & __BLOCK_SFTRST);
__REG_CLR(*block_reg) = __BLOCK_CLKGATE;
__REG_SET(*block_reg) = __BLOCK_SFTRST;
while(!(*block_reg & __BLOCK_CLKGATE));
__REG_CLR(*block_reg) = __BLOCK_SFTRST;
while(*block_reg & __BLOCK_SFTRST);
__REG_CLR(*block_reg) = __BLOCK_CLKGATE;
while(*block_reg & __BLOCK_CLKGATE);
}
void udelay(unsigned us)
{
uint32_t ref = HW_DIGCTL_MICROSECONDS;
while(!imx233_us_elapsed(ref, us));
}
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