/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2007 by Karl Kurbjun * * 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 "cpu.h" #include "mmu-arm.h" #include "kernel.h" #include "system.h" #include "panic.h" #include "uart-target.h" #include "system-arm.h" #include "spi.h" #ifdef CREATIVE_ZVx #include "dma-target.h" #else #include "usb-mr500.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(TIMER0); default_interrupt(TIMER1); default_interrupt(TIMER2); default_interrupt(TIMER3); default_interrupt(CCD_VD0); default_interrupt(CCD_VD1); default_interrupt(CCD_WEN); default_interrupt(VENC); default_interrupt(SERIAL0); default_interrupt(SERIAL1); default_interrupt(EXT_HOST); default_interrupt(DSPHINT); default_interrupt(UART0); default_interrupt(UART1); default_interrupt(USB_DMA); default_interrupt(USB_CORE); default_interrupt(VLYNQ); default_interrupt(MTC0); default_interrupt(MTC1); default_interrupt(SD_MMC); default_interrupt(SDIO_MS); default_interrupt(GIO0); default_interrupt(GIO1); default_interrupt(GIO2); default_interrupt(GIO3); default_interrupt(GIO4); default_interrupt(GIO5); default_interrupt(GIO6); default_interrupt(GIO7); default_interrupt(GIO8); default_interrupt(GIO9); default_interrupt(GIO10); default_interrupt(GIO11); default_interrupt(GIO12); default_interrupt(GIO13); default_interrupt(GIO14); default_interrupt(GIO15); default_interrupt(PREVIEW0); default_interrupt(PREVIEW1); default_interrupt(WATCHDOG); default_interrupt(I2C); default_interrupt(CLKC); default_interrupt(ICE); default_interrupt(ARMCOM_RX); default_interrupt(ARMCOM_TX); default_interrupt(RESERVED); /* The entry address is equal to base address plus an offset. * The offset is based on the priority of the interrupt. So if * the priority of an interrupt is changed, the user should also * change the offset for the interrupt in the entry table. */ static const unsigned short const irqpriority[] = { IRQ_TIMER0,IRQ_TIMER1,IRQ_TIMER2,IRQ_TIMER3,IRQ_CCD_VD0,IRQ_CCD_VD1, IRQ_CCD_WEN,IRQ_VENC,IRQ_SERIAL0,IRQ_SERIAL1,IRQ_EXT_HOST,IRQ_DSPHINT, IRQ_UART0,IRQ_UART1,IRQ_USB_DMA,IRQ_USB_CORE,IRQ_VLYNQ,IRQ_MTC0,IRQ_MTC1, IRQ_SD_MMC,IRQ_SDIO_MS,IRQ_GIO0,IRQ_GIO1,IRQ_GIO2,IRQ_GIO3,IRQ_GIO4,IRQ_GIO5, IRQ_GIO6,IRQ_GIO7,IRQ_GIO8,IRQ_GIO9,IRQ_GIO10,IRQ_GIO11,IRQ_GIO12,IRQ_GIO13, IRQ_GIO14,IRQ_GIO15,IRQ_PREVIEW0,IRQ_PREVIEW1,IRQ_WATCHDOG,IRQ_I2C,IRQ_CLKC, IRQ_ICE,IRQ_ARMCOM_RX,IRQ_ARMCOM_TX,IRQ_RESERVED }; /* IRQ priorities, ranging from highest to lowest */ static void (* const irqvector[])(void) = { TIMER0,TIMER1,TIMER2,TIMER3,CCD_VD0,CCD_VD1, CCD_WEN,VENC,SERIAL0,SERIAL1,EXT_HOST,DSPHINT, UART0,UART1,USB_DMA,USB_CORE,VLYNQ,MTC0,MTC1, SD_MMC,SDIO_MS,GIO0,GIO1,GIO2,GIO3,GIO4,GIO5, GIO6,GIO7,GIO8,GIO9,GIO10,GIO11,GIO12,GIO13, GIO14,GIO15,PREVIEW0,PREVIEW1,WATCHDOG,I2C,CLKC, ICE,ARMCOM_RX,ARMCOM_TX,RESERVED }; static const char * const irqname[] = { "TIMER0","TIMER1","TIMER2","TIMER3","CCD_VD0","CCD_VD1", "CCD_WEN","VENC","SERIAL0","SERIAL1","EXT_HOST","DSPHINT", "UART0","UART1","USB_DMA","USB_CORE","VLYNQ","MTC0","MTC1", "SD_MMC","SDIO_MS","GIO0","GIO1","GIO2","GIO3","GIO4","GIO5", "GIO6","GIO7","GIO8","GIO9","GIO10","GIO11","GIO12","GIO13", "GIO14","GIO15","PREVIEW0","PREVIEW1","WATCHDOG","I2C","CLKC", "ICE","ARMCOM_RX","ARMCOM_TX","RESERVED" }; static void UIRQ(void) { unsigned int offset = (IO_INTC_IRQENTRY0>>2)-1; 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 */ unsigned short addr = IO_INTC_IRQENTRY0>>2; if(addr != 0) { addr--; irqvector[addr](); } 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) { /* * Based on: linux/arch/arm/kernel/entry-armv.S and system-meg-fx.c */ asm volatile ( "sub lr, lr, #4 \r\n" "stmfd sp!, {r0-r3, ip, lr} \r\n" "mov r0, #0x00030000 \r\n" "ldr r0, [r0, #0x510] \r\n" /* Fetch value from IO_INTC_FIQENTRY0 */ "sub r0, r0, #1 \r\n" "ldr r1, =irqvector \r\n" "ldr r1, [r1, r0, lsl #2] \r\n" /* Divide value by 4 (TBA0/TBA1 is set to 0) and load appropriate pointer from the vector list */ "blx r1 \r\n" /* Jump to handler */ "ldmfd sp!, {r0-r3, ip, pc}^ \r\n" /* Return from FIQ */ ); } void system_reboot(void) { /* Code taken from linux/include/asm-arm/arch-itdm320-20/system.h at NeuroSVN */ __asm__ __volatile__( "mov ip, #0 \n" "mcr p15, 0, ip, c7, c7, 0 @ invalidate cache \n" "mcr p15, 0, ip, c7, c10,4 @ drain WB \n" "mcr p15, 0, ip, c8, c7, 0 @ flush TLB (v4) \n" "mrc p15, 0, ip, c1, c0, 0 @ get ctrl register\n" "bic ip, ip, #0x000f @ ............wcam \n" "bic ip, ip, #0x2100 @ ..v....s........ \n" "mcr p15, 0, ip, c1, c0, 0 @ ctrl register \n" "mov ip, #0xFF000000 \n" "orr pc, ip, #0xFF0000 @ ip = 0xFFFF0000 \n" : : : "cc" ); } void system_exception_wait(void) { /* Mask all Interrupts. */ IO_INTC_EINT0 = 0; IO_INTC_EINT1 = 0; IO_INTC_EINT2 = 0; while ((IO_GIO_BITSET0&0x01) != 0); /* Wait for power button */ } void system_init(void) { /* taken from linux/arch/arm/mach-itdm320-20/irq.c */ /* Clearing all FIQs and IRQs. */ IO_INTC_IRQ0 = 0xFFFF; IO_INTC_IRQ1 = 0xFFFF; IO_INTC_IRQ2 = 0xFFFF; IO_INTC_FIQ0 = 0xFFFF; IO_INTC_FIQ1 = 0xFFFF; IO_INTC_FIQ2 = 0xFFFF; /* Masking all Interrupts. */ IO_INTC_EINT0 = 0; IO_INTC_EINT1 = 0; IO_INTC_EINT2 = 0; /* Setting INTC to all IRQs. */ IO_INTC_FISEL0 = 0; IO_INTC_FISEL1 = 0; IO_INTC_FISEL2 = 0; /* setup the clocks */ IO_CLK_DIV0=0x0003; IO_CLK_DIV1=0x0102; IO_CLK_DIV2=0x021F; IO_CLK_DIV3=0x1FFF; IO_CLK_DIV4=0x1F00; IO_CLK_PLLA=0x80A0; IO_CLK_PLLB=0x80C0; IO_CLK_SEL0=0x017E; IO_CLK_SEL1=0x1000; IO_CLK_SEL2=0x1001; /* need to wait before bypassing */ IO_CLK_BYP=0x0000; /* turn off some unneeded modules */ IO_CLK_MOD0 &= ~0x0018; IO_CLK_MOD1 = 0x0918; IO_CLK_MOD2 = ~0x7C58; /* IRQENTRY only reflects enabled interrupts */ IO_INTC_RAW = 0; IO_INTC_ENTRY_TBA0 = 0; IO_INTC_ENTRY_TBA1 = 0; int i; /* Set interrupt priorities to predefined values */ for(i = 0; i < 23; i++) DM320_REG(0x0540+i*2) = ((irqpriority[i*2+1] & 0x3F) << 8) | (irqpriority[i*2] & 0x3F); /* IO_INTC_PRIORITYx */ /* Turn off all timers */ IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_STOP; IO_TIMER1_TMMD = CONFIG_TIMER1_TMMD_STOP; IO_TIMER2_TMMD = CONFIG_TIMER2_TMMD_STOP; IO_TIMER3_TMMD = CONFIG_TIMER3_TMMD_STOP; #ifndef CREATIVE_ZVx /* set GIO26 (reset pin) to output and low */ IO_GIO_BITCLR1=(1<<10); IO_GIO_DIR1&=~(1<<10); #endif uart_init(); spi_init(); #ifdef CREATIVE_ZVx dma_init(); #endif #if !defined(LCD_NATIVE_WIDTH) && !defined(LCD_NATIVE_HEIGHT) #define LCD_NATIVE_WIDTH LCD_WIDTH #define LCD_NATIVE_HEIGHT LCD_HEIGHT #endif #define LCD_FUDGE LCD_NATIVE_WIDTH%32 #define LCD_BUFFER_SIZE ((LCD_NATIVE_WIDTH+LCD_FUDGE)*LCD_NATIVE_HEIGHT*2) #define LCD_TTB_AREA ((LCD_BUFFER_SIZE>>19)+1) /* MMU initialization (Starts data and instruction cache) */ ttb_init(); /* Make sure everything is mapped on itself */ map_section(0, 0, 0x1000, CACHE_NONE); /* Enable caching for RAM */ map_section(CONFIG_SDRAM_START, CONFIG_SDRAM_START, MEM, CACHE_ALL); /* enable buffered writing for the framebuffer */ map_section((int)FRAME, (int)FRAME, LCD_TTB_AREA, BUFFERED); #ifdef CREATIVE_ZVx /* mimic OF */ map_section(0x00100000, 0x00100000, 4, CACHE_NONE); map_section(0x04700000, 0x04700000, 2, BUFFERED); map_section(0x40000000, 0x40000000, 16, CACHE_NONE); map_section(0x50000000, 0x50000000, 16, CACHE_NONE); map_section(0x60000000, 0x60000000, 16, CACHE_NONE); map_section(0x80000000, 0x80000000, 1, CACHE_NONE); #endif enable_mmu(); } int system_memory_guard(int newmode) { (void)newmode; return 0; } #ifdef HAVE_ADJUSTABLE_CPU_FREQ void set_cpu_frequency(long frequency) { if (frequency == CPUFREQ_MAX) { IO_CLK_DIV0 = 0x0101; /* 175 MHz ARM */ } else { IO_CLK_DIV0 = 0x0003; /* 87.5 MHz ARM - not much savings, about 3 mA */ } } #endif /* This function is pretty crude. It is not acurate to a usec, but errors on * longer. */ void udelay(int usec) { volatile int temp=usec*(175000/200); while(temp) { temp--; } }