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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Rob Purchase
* Copyright © 2008 Rafaël Carré
*
* 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"
#include "ascodec-target.h"
#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(INT_WATCHDOG);
default_interrupt(INT_TIMER1);
default_interrupt(INT_TIMER2);
default_interrupt(INT_USB);
default_interrupt(INT_DMAC);
default_interrupt(INT_NAND);
default_interrupt(INT_IDE);
default_interrupt(INT_MCI0);
default_interrupt(INT_MCI1);
default_interrupt(INT_AUDIO);
default_interrupt(INT_SSP);
default_interrupt(INT_I2C_MS);
default_interrupt(INT_I2C_AUDIO);
default_interrupt(INT_I2SIN);
default_interrupt(INT_I2SOUT);
default_interrupt(INT_UART);
default_interrupt(INT_GPIOD);
default_interrupt(RESERVED1); /* Interrupt 17 : unused */
default_interrupt(INT_CGU);
default_interrupt(INT_MEMORY_STICK);
default_interrupt(INT_DBOP);
default_interrupt(RESERVED2); /* Interrupt 21 : unused */
default_interrupt(RESERVED3); /* Interrupt 22 : unused */
default_interrupt(RESERVED4); /* Interrupt 23 : unused */
default_interrupt(RESERVED5); /* Interrupt 24 : unused */
default_interrupt(RESERVED6); /* Interrupt 25 : unused */
default_interrupt(RESERVED7); /* Interrupt 26 : unused */
default_interrupt(RESERVED8); /* Interrupt 27 : unused */
default_interrupt(RESERVED9); /* Interrupt 28 : unused */
default_interrupt(INT_GPIOA);
default_interrupt(INT_GPIOB);
default_interrupt(INT_GPIOC);
static void (* const irqvector[])(void) =
{
INT_WATCHDOG, INT_TIMER1, INT_TIMER2, INT_USB, INT_DMAC, INT_NAND, INT_IDE, INT_MCI0,
INT_MCI1, INT_AUDIO, INT_SSP, INT_I2C_MS, INT_I2C_AUDIO, INT_I2SIN, INT_I2SOUT,
INT_UART, INT_GPIOD, RESERVED1 /* 17 */ ,INT_CGU, INT_MEMORY_STICK, INT_DBOP,
RESERVED2 /* 21 */, RESERVED3 /* 22 */, RESERVED4 /* 23 */, RESERVED5 /* 24 */,
RESERVED6 /* 25 */, RESERVED7 /* 26 */, RESERVED8 /* 27 */, RESERVED9 /* 28 */,
INT_GPIOA, INT_GPIOB, INT_GPIOC
};
static const char * const irqname[] =
{
"INT_WATCHDOG", "INT_TIMER1", "INT_TIMER2", "INT_USB", "INT_DMAC", "INT_NAND",
"INT_IDE", "INT_MCI0", "INT_MCI1", "INT_AUDIO", "INT_SSP", "INT_I2C_MS",
"INT_I2C_AUDIO", "INT_I2SIN", "INT_I2SOUT", "INT_UART", "INT_GPIOD", "RESERVED1",
"INT_CGU", "INT_MEMORY_STICK", "INT_DBOP", "RESERVED2", "RESERVED3", "RESERVED4",
"RESERVED5", "RESERVED6", "RESERVED7", "RESERVED8", "RESERVED9", "INT_GPIOA",
"INT_GPIOB", "INT_GPIOC"
};
static void UIRQ(void)
{
unsigned int irq_no = 0;
int status = VIC_IRQ_STATUS;
while((status >>= 1))
irq_no++;
panicf("Unhandled IRQ %02X: %s", irq_no, irqname[irq_no]);
}
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 int irq_no = 0;
int status = VIC_IRQ_STATUS;
while((status >>= 1))
irq_no++;
irqvector[irq_no]();
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"
);
}
#ifdef BOOTLOADER
static void sdram_delay(void)
{
int delay = 1024; /* arbitrary */
while (delay--) ;
}
/* Use the same initialization than OF */
static void sdram_init(void)
{
CGU_PERI &= ~(0xf<<2); /* clear div0 (memclock) */
CGU_PERI |= (1<<2); /* divider = 2 */
CGU_PERI |= (1<<26)|(1<<27); /* extmem & extmem intf clocks */
MPMC_CONTROL = 0x1; /* enable MPMC */
MPMC_DYNAMIC_CONTROL = 0x183; /* SDRAM NOP, all clocks high */
sdram_delay();
MPMC_DYNAMIC_CONTROL = 0x103; /* SDRAM PALL, all clocks high */
sdram_delay();
MPMC_DYNAMIC_REFRESH = 0x138; /* 0x138 * 16 HCLK ticks between SDRAM refresh cycles */
MPMC_CONFIG = 0; /* little endian, HCLK:MPMCCLKOUT[3:0] ratio = 1:1 */
if(MPMC_PERIPH_ID2 & 0xf0)
MPMC_DYNAMIC_READ_CONFIG = 0x1; /* command delayed, clock out not delayed */
/* timings */
MPMC_DYNAMIC_tRP = 2;
MPMC_DYNAMIC_tRAS = 4;
MPMC_DYNAMIC_tSREX = 5;
MPMC_DYNAMIC_tAPR = 0;
MPMC_DYNAMIC_tDAL = 4;
MPMC_DYNAMIC_tWR = 2;
MPMC_DYNAMIC_tRC = 5;
MPMC_DYNAMIC_tRFC = 5;
MPMC_DYNAMIC_tXSR = 5;
MPMC_DYNAMIC_tRRD = 2;
MPMC_DYNAMIC_tMRD = 2;
#if defined(SANSA_CLIP) || defined(SANSA_M200V4)
/* 16 bits external bus, low power SDRAM, 16 Mbits = 2 Mbytes */
#define MEMORY_MODEL 0x21
#elif defined(SANSA_E200V2) || defined(SANSA_FUZE)
/* 16 bits external bus, high performance SDRAM, 64 Mbits = 8 Mbytes */
#define MEMORY_MODEL 0x5
#else
#error "The external memory in your player is unknown"
#endif
MPMC_DYNAMIC_RASCAS_0 = (2<<8)|2; /* CAS & RAS latency = 2 clock cycles */
MPMC_DYNAMIC_CONFIG_0 = (MEMORY_MODEL << 7);
MPMC_DYNAMIC_RASCAS_1 = MPMC_DYNAMIC_CONFIG_1 =
MPMC_DYNAMIC_RASCAS_2 = MPMC_DYNAMIC_CONFIG_2 =
MPMC_DYNAMIC_RASCAS_3 = MPMC_DYNAMIC_CONFIG_3 = 0;
MPMC_DYNAMIC_CONTROL = 0x82; /* SDRAM MODE, MPMCCLKOUT runs continuously */
/* this part is required, if you know why please explain */
unsigned int tmp = *(volatile unsigned int*)(0x30000000+0x2300*MEM);
(void)tmp; /* we just need to read from this location */
MPMC_DYNAMIC_CONTROL = 0x2; /* SDRAM NORMAL, MPMCCLKOUT runs continuously */
MPMC_DYNAMIC_CONFIG_0 |= (1<<19); /* buffer enable */
}
#endif
void system_init(void)
{
#ifdef BOOTLOADER
#if 0 /* the GPIO clock is already enabled by the dualboot function */
CGU_PERI |= CGU_GPIO_CLOCK_ENABLE;
#endif
CGU_PROC = 0; /* fclk 24 MHz */
CGU_PERI &= ~0x7f; /* pclk 24 MHz */
asm volatile(
"mrc p15, 0, r0, c1, c0 \n"
"orr r0, r0, #0xC0000000 \n" /* asynchronous clocking */
"mcr p15, 0, r0, c1, c0 \n"
: : : "r0" );
CGU_PLLA = 0x4330; /* PLLA 384 MHz */
while(!(CGU_INTCTRL & (1<<0))); /* wait until PLLA is locked */
CGU_PROC = (3<<2)|0x01; /* fclk = PLLA*5/8 = 240 MHz */
asm volatile(
"mrs r0, cpsr \n"
"orr r0, r0, #0x80 \n" /* disable interrupts */
"msr cpsr, r0 \n"
"mov r0, #0 \n"
"mcr p15, 0, r0, c7, c7 \n" /* invalidate icache & dcache */
"mrc p15, 0, r0, c1, c0 \n" /* control register */
"orr r0, r0, #0x1000 \n" /* enable icache */
"orr r0, r0, #4 \n" /* enable dcache */
"mcr p15, 0, r0, c1, c0 \n"
: : : "r0" );
sdram_init();
CGU_PERI |= (5<<2)|0x01; /* pclk = PLLA / 6 = 64 MHz */
/* enable timer interface for TIMER1 & TIMER2 */
CGU_PERI |= CGU_TIMERIF_CLOCK_ENABLE;
/* enable VIC */
CGU_PERI |= CGU_VIC_CLOCK_ENABLE;
VIC_INT_SELECT = 0; /* only IRQ, no FIQ */
#else
/* disable fast hardware power-off, to use power button normally */
ascodec_init();
ascodec_write(AS3514_CVDD_DCDC3, ascodec_read(AS3514_CVDD_DCDC3) & (1<<2));
#endif /* BOOTLOADER */
}
void system_reboot(void)
{
}
int system_memory_guard(int newmode)
{
(void)newmode;
return 0;
}
#ifndef BOOTLOADER
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
void set_cpu_frequency(long frequency)
{
/* TODO */
}
#endif /* HAVE_ADJUSTABLE_CPU_FREQ */
#endif /* BOOTLOADER */
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