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rockbox/firmware/target/arm/tcc77x/system-tcc77x.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Dave Chapman
*
* 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"
/* Externally defined interrupt handlers */
extern void TIMER(void);
extern void ADC(void);
extern void USBD_IRQ(void);
void irq(void)
{
int irq = IREQ & 0x7fffffff;
CREQ = irq; /* Clears the corresponding IRQ status */
if (irq & TIMER0_IRQ_MASK)
TIMER();
else if (irq & ADC_IRQ_MASK)
ADC();
#ifdef HAVE_USBSTACK
else if (irq & USBD_IRQ_MASK)
USBD_IRQ();
#endif
else
panicf("Unhandled IRQ 0x%08X", irq);
}
void fiq_handler(void) __attribute__((interrupt ("FIQ"), naked));
#ifdef BOOTLOADER
void fiq_handler(void)
{
/* TODO */
}
#endif
void system_reboot(void)
{
}
/* TODO - these should live in the target-specific directories and
once we understand what all the GPIO pins do, move the init to the
specific driver for that hardware. For now, we just perform the
same GPIO init as the original firmware - this makes it easier to
investigate what the GPIO pins do.
*/
#ifdef LOGIK_DAX
static void gpio_init(void)
{
/* Do what the original firmware does */
GPIOD_FUNC = 0;
GPIOD_DIR = 0x3f0;
GPIOD = 0xe0;
GPIOE_FUNC = 0;
GPIOE_DIR = 0xe0;
GPIOE = 0;
GPIOA_FUNC = 0;
GPIOA_DIR = 0xffff1000; /* 0 - 0xf000 */
GPIOA = 0x1080;
GPIOB_FUNC = 0x16a3;
GPIOB_DIR = 0x6ffff;
GPIOB = 0;
GPIOC_FUNC = 1;
GPIOC_DIR = 0x03ffffff; /* mvn r2, 0xfc000000 */
GPIOC = 0;
}
#elif defined(IAUDIO_7)
static void gpio_init(void)
{
/* Do what the original firmware does */
GPIOA_FUNC = 0;
GPIOB_FUNC = 0x1623;
GPIOC_FUNC = 1;
GPIOD_FUNC = 0;
GPIOE_FUNC = 0;
GPIOA = 0x30;
GPIOB = 0x80000;
GPIOC = 0;
GPIOD = 0x180;
GPIOE = 0;
GPIOA_DIR = 0x84b0;
GPIOB_DIR = 0x80800;
GPIOC_DIR = 0x2000000;
GPIOD_DIR = 0x3e3;
GPIOE_DIR = 0x88;
}
#elif defined(SANSA_M200)
static void gpio_init(void)
{
/* TODO - Implement for M200 */
}
#elif defined(SANSA_C100)
static void gpio_init(void)
{
/* Do what the original firmware does */
GPIOA_FUNC = 0;
GPIOB_FUNC = 0x16A3;
GPIOC_FUNC = 1;
GPIOD_FUNC |= 2;
GPIOE_FUNC = 0;
GPIOA_DIR = 0xFFFF0E00;
GPIOB_DIR = 0x6FFFF;
GPIOC_DIR = 0x03FFFFFF;
GPIOD_DIR = 0x3F7;
GPIOE_DIR = 0x9B;
GPIOA = 0x80;
GPIOB = 0;
GPIOC = 0;
GPIOD |= 0xC0;
GPIOE = 0x9B;
}
#endif
/* Second function called in the original firmware's startup code - we just
set up the clocks in the same way as the original firmware for now. */
static void clock_init(void)
{
unsigned int i;
/* STP = 0x1, PW = 0x04 , HLD = 0x0 */
CSCFG3 = (CSCFG3 &~ 0x3fff) | 0x820;
/* XIN=External main, Fcpu=Fsys, BCKDIV=1 (Fbus = Fsys / 2) */
CLKCTRL = (CLKCTRL & ~0xff) | 0x14;
if (BMI & 0x20)
PCLKCFG0 = 0xc82d7000; /* EN1 = 1, XIN=Ext. main, DIV1 = 0x2d, P1 = 1 */
else
PCLKCFG0 = 0xc8ba7000; /* EN1 = 1, XIN=Ext. main, DIV1 = 0xba, P1 = 1 */
MCFG |= 0x2000;
#ifdef LOGIK_DAX
/* Only seen in the Logik DAX original firmware */
SDCFG = (SDCFG & ~0x7000) | 0x2000;
#endif
/* Disable PLL */
PLL0CFG |= 0x80000000;
/* Enable PLL, M=0xcf, P=0x13. m=M+8, p=P+2, S = 0
Fout = (215/21)*12MHz = 122857142Hz */
PLL0CFG = 0x0000cf13;
i = 8000;
while (--i) {};
/* Enable PLL0 */
CLKDIVC = 0x81000000;
/* Fsys = PLL0, Fcpu = Fsys, Fbus=Fsys / 2 */
CLKCTRL = 0x80000010;
asm volatile (
"nop \n\t"
"nop \n\t"
);
}
static void cpu_init(void)
{
/* Memory protection - see page 48 of ARM946 TRM
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0201d/DDI0201D_arm946es_r1p1_trm.pdf
*/
asm volatile (
/* Region 0 - addr=0, size=4GB, enabled */
"mov r0, #0x3f \n\t"
"mcr p15, 0, r0, c6, c0, 0 \n\t"
"mcr p15, 0, r0, c6, c0, 1 \n\t"
#if defined(LOGIK_DAX) || defined(SANSA_C100)
/* Address region 1 - addr 0x2fff0000, size=64KB, enabled*/
"ldr r0, =0x2fff001f \n\t"
#elif defined(IAUDIO_7)
/* Address region 1 - addr 0x20000000, size=8KB, enabled*/
"mov r0, #0x19 \n\t"
"add r0, r0, #0x20000000 \n\t"
#elif defined(SANSA_M200)
/* Address region 1 - addr 0x20000000, size=256MB, enabled*/
"mov r0, #0x37 \n\t"
"add r0, r0, #0x20000000 \n\t"
#endif
"mcr p15, 0, r0, c6, c1, 0 \n\t"
"mcr p15, 0, r0, c6, c1, 1 \n\t"
/* Address region 2 - addr 0x30000000, size=256MB, enabled*/
"mov r0, #0x37 \n\t"
"add r0, r0, #0x30000000 \n\t"
"mcr p15, 0, r0, c6, c2, 0 \n\t"
"mcr p15, 0, r0, c6, c2, 1 \n\t"
/* Address region 2 - addr 0x40000000, size=512MB, enabled*/
"mov r0, #0x39 \n\t"
"add r0, r0, #0x40000000 \n\t"
"mcr p15, 0, r0, c6, c3, 0 \n\t"
"mcr p15, 0, r0, c6, c3, 1 \n\t"
/* Address region 4 - addr 0x60000000, size=256MB, enabled*/
"mov r0, #0x37 \n\t"
"add r0, r0, #0x60000000 \n\t"
"mcr p15, 0, r0, c6, c4, 0 \n\t"
"mcr p15, 0, r0, c6, c4, 1 \n\t"
/* Address region 5 - addr 0x10000000, size=256MB, enabled*/
"mov r0, #0x37 \n\t"
"add r0, r0, #0x10000000 \n\t"
"mcr p15, 0, r0, c6, c5, 0 \n\t"
"mcr p15, 0, r0, c6, c5, 1 \n\t"
/* Address region 6 - addr 0x80000000, size=2GB, enabled*/
"mov r0, #0x37 \n\t"
"add r0, r0, #0x80000006 \n\t"
"mcr p15, 0, r0, c6, c6, 0 \n\t"
"mcr p15, 0, r0, c6, c6, 1 \n\t"
/* Address region 7 - addr 0x3000f000, size=4KB, enabled*/
"ldr r0, =0x3000f017 \n\t"
"mcr p15, 0, r0, c6, c7, 0 \n\t"
"mcr p15, 0, r0, c6, c7, 1 \n\t"
/* Register 5 - Access Permission Registers */
"ldr r0, =0xffff \n\t"
"mcr p15, 0, r0, c5, c0, 0 \n\t" /* write data access permission bits */
"mcr p15, 0, r0, c5, c0, 1 \n\t" /* write instruction access permission bits */
"mov r0, #0xa7 \n\t"
"mcr p15, 0, r0, c3, c0, 0 \n\t" /* set write buffer control register */
#if defined(LOGIK_DAX) || defined(SANSA_C100)
"mov r0, #0xa5 \n\t"
#elif defined(IAUDIO_7) || defined(SANSA_M200)
"mov r0, #0xa7 \n\t"
#elif
#error NOT DEFINED FOR THIS TARGET!
#endif
"mcr p15, 0, r0, c2, c0, 0 \n\t"
"mcr p15, 0, r0, c2, c0, 1 \n\t"
"mov r0, #0xa0000006 \n\t"
"mcr p15, 0, r0, c9, c1, 0 \n\t"
"ldr r1, =0x1107d \n\t"
"mov r0, #0x0 \n\t"
"mcr p15, 0, r0, c7, c5, 0 \n\t" /* Flush instruction cache */
"mcr p15, 0, r0, c7, c6, 0 \n\t" /* Flush data cache */
"mcr p15, 0, r1, c1, c0, 0 \n\t" /* CPU control bits */
: : : "r0", "r1"
);
}
void system_init(void)
{
/* mask all interrupts */
IEN = 0;
/* Set all interrupts as IRQ for now - some may need to be FIQ in future */
IRQSEL = 0xffffffff;
/* Set master enable bit */
IEN = 0x80000000;
cpu_init();
clock_init();
gpio_init();
enable_irq();
}
int system_memory_guard(int newmode)
{
(void)newmode;
return 0;
}
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
void set_cpu_frequency(long frequency)
{
}
#endif
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