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rockbox/firmware/target/arm/tms320dm320/system-dm320.c
Tomasz Moń 37f4dfc259 TMS320DM320: Prevent lockup in udelay() when this function is called with interrupts disabled. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31392 a1c6a512-1295-4272-9138-f99709370657
2011-12-21 14:56:22 +00:00

472 lines
14 KiB
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/***************************************************************************
* __________ __ ___.
* 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"
#include "i2c.h"
#ifdef CREATIVE_ZVx
#include "dma-target.h"
#endif
#ifdef MROBE_500
#include "usb-mr500.h"
#endif
#ifdef SANSA_CONNECT
#include "avr-sansaconnect.h"
#endif
static unsigned short clock_arm_slow = 0xFFFF;
static unsigned short clock_arm_fast = 0xFFFF;
#define default_interrupt(name) \
extern __attribute__((weak,alias("UIRQ"))) void name (void)
void irq_handler(void) __attribute__((interrupt ("IRQ"), section(".icode")));
void fiq_handler(void) __attribute__((interrupt ("FIQ"), section(".icode")));
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) __attribute__ ((section(".idata"))) =
{
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)
{
unsigned short addr = IO_INTC_IRQENTRY0>>2;
if(addr != 0)
{
addr--;
irqvector[addr]();
}
}
void fiq_handler(void)
{
/*
* Based on: linux/arch/arm/kernel/entry-armv.S and system-meg-fx.c
*/
unsigned short addr = IO_INTC_FIQENTRY0>>2;
if(addr != 0)
{
addr--;
irqvector[addr]();
}
}
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;
#ifdef MROBE_500
while ((IO_GIO_BITSET0&0x01) != 0); /* Wait for power button */
#endif
#ifdef SANSA_CONNECT
while (1); /* Holding power button for a while makes avr system reset */
#endif
}
void system_init(void)
{
unsigned int vector_addr;
/* Pin 33 is connected to a buzzer, for an annoying sound set
* PWM0C == 0x3264
* PWM0H == 0x1932
* Function to 1
* Since this is not used in the FW, set it to a normal output at a zero
* level. */
/* 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;
/* Only initially needed clocks should be turned on */
IO_CLK_MOD0 = CLK_MOD0_HPIB | CLK_MOD0_DSP | CLK_MOD0_SDRAMC |
CLK_MOD0_EMIF | CLK_MOD0_INTC | CLK_MOD0_AIM |
CLK_MOD0_AHB | CLK_MOD0_BUSC | CLK_MOD0_ARM;
IO_CLK_MOD1 = CLK_MOD1_CPBUS;
IO_CLK_MOD2 = CLK_MOD2_GIO;
#if 0
if (IO_BUSC_REVR == REVR_ES11)
{
/* Agressive clock setup for newer parts (ES11) - this is actually lower
* power also.
*/
/* Setup the EMIF interface timings */
/* ATA interface:
* If this is the newer silicon the timings need to be slowed down some
* for reliable access due to the faster ARM clock.
*/
/* OE width, WE width, CS width, Cycle width */
IO_EMIF_CS3CTRL1 = (8 << 12) | (8 << 8) | (14 << 4) | 15;
/* 14: Width (16), 12: Idles, 8: OE setup, 4: WE Setup, CS setup */
IO_EMIF_CS3CTRL2 = (1<<14) | (1 << 12) | (3 << 8) | (3 << 4) | 1;
/* USB interface:
* The following EMIF timing values are from the OF:
* IO_EMIF_CS4CTRL1 = 0x66AB;
* IO_EMIF_CS4CTRL2 = 0x4220;
*
* More agressive numbers may be possible, but it depends on the clocking
* setup.
*/
IO_EMIF_CS4CTRL1 = 0x66AB;
IO_EMIF_CS4CTRL2 = 0x4220;
/* 27 MHz input clock:
* PLLA: 27 * 15 / 2 = 202.5 MHz
* PLLB: 27 * 9 / 2 = 121.5 MHz (off: bit 12)
*/
IO_CLK_PLLA = (14 << 4) | 1;
IO_CLK_PLLB = ( 1 << 12) | ( 8 << 4) | 1;
/* Set the slow and fast clock speeds used for boosting
* Slow Setup:
* ARM div = 4 ( 50.625 MHz )
* AHB div = 1 ( 50.625 MHz )
* Fast Setup:
* ARM div = 1 ( 202.5 MHz )
* AHB div = 2 ( 101.25 MHz )
*/
clock_arm_slow = (0 << 8) | 3;
clock_arm_fast = (1 << 8) | 0;
IO_CLK_DIV0 = clock_arm_slow;
/* SDRAM div= 2 ( 101.25 MHz )
* AXL div = 1 ( 202.5 MHz )
*/
IO_CLK_DIV1 = (0 << 8) | 1;
/* MS div = 15 ( 13.5 MHz )
* DSP div = 4 ( 50.625 MHz - could be double, but this saves power)
*/
IO_CLK_DIV2 = (3 << 8) | 14;
/* MMC div = 256 ( slow )
* VENC div = 32 ( 843.75 KHz )
*/
IO_CLK_DIV3 = (31 << 8) | 255;
/* I2C div = 1 ( 48 MHz if M48XI is running )
* VLNQ div = 32
*/
IO_CLK_DIV4 = (31 << 8) | 0;
/* Feed everything from PLLA */
IO_CLK_SEL0=0x007E;
IO_CLK_SEL1=0x1000;
IO_CLK_SEL2=0x0000;
}
else
#endif
{
#ifdef SANSA_CONNECT
/* Setting AHB divisor to 0 causes MMC/SD interface to lock */
clock_arm_slow = (1 << 8) | 3;
clock_arm_fast = (1 << 8) | 1;
#else
/* Set the slow and fast clock speeds used for boosting
* Slow Setup:
* ARM div = 4 ( 87.5 MHz )
* AHB div = 1 ( 87.5 MHz )
* Fast Setup:
* ARM div = 2 ( 175 MHz )
* AHB div = 2 ( 87.5 MHz )
*/
clock_arm_slow = (0 << 8) | 3;
clock_arm_fast = (1 << 8) | 1;
#endif
}
/* M48XI disabled, USB buffer powerdown */
IO_CLK_LPCTL1 = 0x11; /* I2C wodn't work with this disabled */
/* IRQENTRY only reflects enabled interrupts */
IO_INTC_RAW = 0;
vector_addr = (unsigned int) irqvector;
IO_INTC_ENTRY_TBA0 = 0;//(short) vector_addr & ~0x000F;
IO_INTC_ENTRY_TBA1 = 0;//(short) (vector_addr >> 16);
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 SANSA_CONNECT
/* UART1 is not used on Sansa Connect - don't power it up */
uart_init();
#endif
spi_init();
#ifdef MROBE_500
/* Initialization is done so shut the front LED off so that the battery
* can charge.
*/
IO_GIO_BITCLR2 = 0x0001;
#endif
#ifdef CREATIVE_ZVx
dma_init();
#endif
#ifdef SANSA_CONNECT
/* keep WIFI CS and reset high to save power */
IO_GIO_DIR0 &= ~((1 << 4) /* CS */ | (1 << 3) /* reset */);
IO_GIO_BITSET0 = (1 << 4) | (1 << 3);
i2c_init();
avr_hid_init();
#ifndef BOOTLOADER
/* Disable External Memory interface (used for accessing NOR flash) */
bitclr16(&IO_CLK_MOD0, CLK_MOD0_EMIF);
#endif
#endif
}
int system_memory_guard(int newmode)
{
(void)newmode;
return 0;
}
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
void set_cpu_frequency(long frequency)
{
/* If these variables have not been changed since startup then boosting
* should not be used.
*/
if(clock_arm_slow == 0xFFFF || clock_arm_fast == 0xFFFF)
{
return;
}
if (frequency == CPUFREQ_MAX)
{
IO_CLK_DIV0 = clock_arm_fast;
FREQ = CPUFREQ_MAX;
}
else
{
IO_CLK_DIV0 = clock_arm_slow;
FREQ = CPUFREQ_NORMAL;
}
}
#endif
/*
* Waits for specified amount of microseconds
*/
void udelay(int usec) {
unsigned short count = IO_TIMER1_TMCNT;
unsigned short stop;
unsigned short tmp = IO_TIMER1_TMDIV;
int prev_tick = current_tick;
/*
* On Sansa Connect tick timer counts from 0 to 26999
* in this case stop will overflow only if usec > 10000
* such long delays shouldn't be blocking (use sleep() instead)
*/
stop = count + usec*((tmp+1)/10000);
stop += (unsigned short)(((unsigned long)(usec)*((tmp%10000)+1))/10000);
/* stop values over TMDIV won't ever be reached */
if (stop > tmp)
{
stop -= tmp;
}
/*
* Status in IO_INTC_IRQ0 is changed even when interrupts are
* masked. If IRQ_TIMER1 bit in IO_INTC_IRQ0 is set to 0, then
* there is pending current_tick update.
*
* Relaying solely on current_tick value when interrupts are disabled
* can lead to lockup.
* Interrupt status bit check below is used to prevent this lockup.
*/
if (stop < count)
{
/* udelay will end after counter reset (tick) */
while ((IO_TIMER1_TMCNT < stop) ||
((current_tick == prev_tick) /* ensure new tick */ &&
(IO_INTC_IRQ0 & IRQ_TIMER1))); /* prevent lock */
}
else
{
/* udelay will end before counter reset (tick) */
while ((IO_TIMER1_TMCNT < stop) &&
((current_tick == prev_tick) && (IO_INTC_IRQ0 & IRQ_TIMER1)));
}
}
#ifdef BOOTLOADER
void system_prepare_fw_start(void)
{
tick_stop();
IO_INTC_EINT0 = 0;
IO_INTC_EINT1 = 0;
IO_INTC_EINT2 = 0;
}
#endif
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