/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2007 by Rob Purchase * * 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 "panic.h" #ifdef IPOD_NANO2G #include "ftl-target.h" #endif #define default_interrupt(name) \ extern __attribute__((weak,alias("UIRQ"))) void name (void) void irq_handler(void) __attribute__((interrupt ("IRQ"), naked)); void fiq_handler(void) __attribute__((interrupt ("FIQ"), naked)); default_interrupt(EXT0); default_interrupt(EXT1); default_interrupt(EXT2); default_interrupt(EINT_VBUS); default_interrupt(EINTG); default_interrupt(INT_TIMERA); default_interrupt(INT_WDT); default_interrupt(INT_TIMERB); default_interrupt(INT_TIMERC); default_interrupt(INT_TIMERD); default_interrupt(INT_DMA); default_interrupt(INT_ALARM_RTC); default_interrupt(INT_PRI_RTC); default_interrupt(RESERVED1); default_interrupt(INT_UART); default_interrupt(INT_USB_HOST); default_interrupt(INT_USB_FUNC); default_interrupt(INT_LCDC_0); default_interrupt(INT_LCDC_1); default_interrupt(INT_ECC); default_interrupt(INT_CALM); default_interrupt(INT_ATA); default_interrupt(INT_UART0); default_interrupt(INT_SPDIF_OUT); default_interrupt(INT_SDCI); default_interrupt(INT_LCD); default_interrupt(INT_SPI); default_interrupt(INT_IIC); default_interrupt(RESERVED2); default_interrupt(INT_MSTICK); default_interrupt(INT_ADC_WAKEUP); default_interrupt(INT_ADC); default_interrupt(INT_UNK1); default_interrupt(INT_UNK2); default_interrupt(INT_UNK3); void INT_TIMER(void) { if (TACON & 0x00038000) INT_TIMERA(); if (TBCON & 0x00038000) INT_TIMERB(); if (TCCON & 0x00038000) INT_TIMERC(); if (TDCON & 0x00038000) INT_TIMERD(); } #if CONFIG_CPU==S5L8701 static void (* const irqvector[])(void) = { /* still 90% unverified and probably incorrect */ EXT0,EXT1,EXT2,EINT_VBUS,EINTG,INT_TIMER,INT_WDT,INT_UNK1, INT_UNK2,INT_UNK3,INT_DMA,INT_ALARM_RTC,INT_PRI_RTC,RESERVED1,INT_UART,INT_USB_HOST, INT_USB_FUNC,INT_LCDC_0,INT_LCDC_1,INT_CALM,INT_ATA,INT_UART0,INT_SPDIF_OUT,INT_ECC, INT_SDCI,INT_LCD,INT_SPI,INT_IIC,RESERVED2,INT_MSTICK,INT_ADC_WAKEUP,INT_ADC }; #else static void (* const irqvector[])(void) = { EXT0,EXT1,EXT2,EINT_VBUS,EINTG,INT_TIMERA,INT_WDT,INT_TIMERB, INT_TIMERC,INT_TIMERD,INT_DMA,INT_ALARM_RTC,INT_PRI_RTC,RESERVED1,INT_UART,INT_USB_HOST, INT_USB_FUNC,INT_LCDC_0,INT_LCDC_1,INT_ECC,INT_CALM,INT_ATA,INT_UART0,INT_SPDIF_OUT, INT_SDCI,INT_LCD,INT_SPI,INT_IIC,RESERVED2,INT_MSTICK,INT_ADC_WAKEUP,INT_ADC }; #endif #if CONFIG_CPU==S5L8701 static const char * const irqname[] = { /* still 90% unverified and probably incorrect */ "EXT0","EXT1","EXT2","EINT_VBUS","EINTG","INT_TIMER","INT_WDT","INT_UNK1", "INT_UNK2","INT_UNK3","INT_DMA","INT_ALARM_RTC","INT_PRI_RTC","Reserved","INT_UART","INT_USB_HOST", "INT_USB_FUNC","INT_LCDC_0","INT_LCDC_1","INT_CALM","INT_ATA","INT_UART0","INT_SPDIF_OUT","INT_ECC", "INT_SDCI","INT_LCD","INT_SPI","INT_IIC","Reserved","INT_MSTICK","INT_ADC_WAKEUP","INT_ADC" }; #else static const char * const irqname[] = { "EXT0","EXT1","EXT2","EINT_VBUS","EINTG","INT_TIMERA","INT_WDT","INT_TIMERB", "INT_TIMERC","INT_TIMERD","INT_DMA","INT_ALARM_RTC","INT_PRI_RTC","Reserved","INT_UART","INT_USB_HOST", "INT_USB_FUNC","INT_LCDC_0","INT_LCDC_1","INT_ECC","INT_CALM","INT_ATA","INT_UART0","INT_SPDIF_OUT", "INT_SDCI","INT_LCD","INT_SPI","INT_IIC","Reserved","INT_MSTICK","INT_ADC_WAKEUP","INT_ADC" }; #endif static void UIRQ(void) { unsigned int offset = INTOFFSET; panicf("Unhandled IRQ %02X: %s", offset, irqname[offset]); } void irq_handler(void) { /* * Based on: linux/arch/arm/kernel/entry-armv.S and system-meg-fx.c */ asm volatile( "stmfd sp!, {r0-r7, ip, lr} \n" /* Store context */ "sub sp, sp, #8 \n"); /* Reserve stack */ int irq_no = INTOFFSET; irqvector[irq_no](); /* clear interrupt */ SRCPND = (1 << irq_no); INTPND = INTPND; asm volatile( "add sp, sp, #8 \n" /* Cleanup stack */ "ldmfd sp!, {r0-r7, ip, lr} \n" /* Restore context */ "subs pc, lr, #4 \n"); /* Return from IRQ */ } void fiq_handler(void) { asm volatile ( "subs pc, lr, #4 \r\n" ); } static void gpio_init(void) { } static void clock_init(void) { } void system_init(void) { } void system_reboot(void) { #ifdef IPOD_NANO2G if (ftl_sync() != 0) panicf("Failed to unmount flash!"); /* Reset the SoC */ asm volatile("msr CPSR_c, #0xd3 \n" "mov r5, #0x110000 \n" "add r5, r5, #0xff \n" "add r6, r5, #0xa00 \n" "mov r10, #0x3c800000 \n" "str r6, [r10] \n" "mov r6, #0xff0 \n" "str r6, [r10,#4] \n" "str r5, [r10] \n"); /* Wait for reboot to kick in */ while(1); #endif } void system_exception_wait(void) { while (1); } int system_memory_guard(int newmode) { (void)newmode; return 0; } #ifdef HAVE_ADJUSTABLE_CPU_FREQ void set_cpu_frequency(long frequency) { if (cpu_frequency == frequency) return; /* CPU/COP frequencies can be scaled between Fbus (min) and Fsys (max). Fbus should not be set below ~32Mhz with LCD enabled or the display will be garbled. */ if (frequency == CPUFREQ_MAX) { } else if (frequency == CPUFREQ_NORMAL) { } else { } asm volatile ( "nop \n\t" "nop \n\t" "nop \n\t" ); cpu_frequency = frequency; } #endif