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rockbox/firmware/target/mips/ingenic_jz47xx/system-jz4740.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Maurus Cuelenaere
*
* 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 "config.h"
#include "jz4740.h"
#include "mips.h"
#include "mipsregs.h"
#include "panic.h"
#include "system.h"
#include "string.h"
#include "kernel.h"
#define NUM_DMA 6
#define NUM_GPIO 128
#define IRQ_MAX (IRQ_GPIO_0 + NUM_GPIO)
static int irq;
static void UIRQ(void)
{
panicf("Unhandled interrupt occurred: %d\n", irq);
}
#define default_interrupt(name) \
extern __attribute__((weak,alias("UIRQ"))) void name (void)
default_interrupt(I2C);
default_interrupt(EMC);
default_interrupt(UHC);
default_interrupt(UART0);
default_interrupt(SADC);
default_interrupt(MSC);
default_interrupt(RTC);
default_interrupt(SSI);
default_interrupt(CIM);
default_interrupt(AIC);
default_interrupt(ETH);
default_interrupt(TCU2);
default_interrupt(TCU1);
default_interrupt(TCU0);
default_interrupt(UDC);
default_interrupt(IPU);
default_interrupt(LCD);
default_interrupt(DMA0);
default_interrupt(DMA1);
default_interrupt(DMA2);
default_interrupt(DMA3);
default_interrupt(DMA4);
default_interrupt(DMA5);
default_interrupt(GPIO0);
default_interrupt(GPIO1);
default_interrupt(GPIO2);
default_interrupt(GPIO3);
default_interrupt(GPIO4);
default_interrupt(GPIO5);
default_interrupt(GPIO6);
default_interrupt(GPIO7);
default_interrupt(GPIO8);
default_interrupt(GPIO9);
default_interrupt(GPIO10);
default_interrupt(GPIO11);
default_interrupt(GPIO12);
default_interrupt(GPIO13);
default_interrupt(GPIO14);
default_interrupt(GPIO15);
default_interrupt(GPIO16);
default_interrupt(GPIO17);
default_interrupt(GPIO18);
default_interrupt(GPIO19);
default_interrupt(GPIO20);
default_interrupt(GPIO21);
default_interrupt(GPIO22);
default_interrupt(GPIO23);
default_interrupt(GPIO24);
default_interrupt(GPIO25);
default_interrupt(GPIO26);
default_interrupt(GPIO27);
default_interrupt(GPIO28);
default_interrupt(GPIO29);
default_interrupt(GPIO30);
default_interrupt(GPIO31);
default_interrupt(GPIO32);
default_interrupt(GPIO33);
default_interrupt(GPIO34);
default_interrupt(GPIO35);
default_interrupt(GPIO36);
default_interrupt(GPIO37);
default_interrupt(GPIO38);
default_interrupt(GPIO39);
default_interrupt(GPIO40);
default_interrupt(GPIO41);
default_interrupt(GPIO42);
default_interrupt(GPIO43);
default_interrupt(GPIO44);
default_interrupt(GPIO45);
default_interrupt(GPIO46);
default_interrupt(GPIO47);
default_interrupt(GPIO48);
default_interrupt(GPIO49);
default_interrupt(GPIO50);
default_interrupt(GPIO51);
default_interrupt(GPIO52);
default_interrupt(GPIO53);
default_interrupt(GPIO54);
default_interrupt(GPIO55);
default_interrupt(GPIO56);
default_interrupt(GPIO57);
default_interrupt(GPIO58);
default_interrupt(GPIO59);
default_interrupt(GPIO60);
default_interrupt(GPIO61);
default_interrupt(GPIO62);
default_interrupt(GPIO63);
default_interrupt(GPIO64);
default_interrupt(GPIO65);
default_interrupt(GPIO66);
default_interrupt(GPIO67);
default_interrupt(GPIO68);
default_interrupt(GPIO69);
default_interrupt(GPIO70);
default_interrupt(GPIO71);
default_interrupt(GPIO72);
default_interrupt(GPIO73);
default_interrupt(GPIO74);
default_interrupt(GPIO75);
default_interrupt(GPIO76);
default_interrupt(GPIO77);
default_interrupt(GPIO78);
default_interrupt(GPIO79);
default_interrupt(GPIO80);
default_interrupt(GPIO81);
default_interrupt(GPIO82);
default_interrupt(GPIO83);
default_interrupt(GPIO84);
default_interrupt(GPIO85);
default_interrupt(GPIO86);
default_interrupt(GPIO87);
default_interrupt(GPIO88);
default_interrupt(GPIO89);
default_interrupt(GPIO90);
default_interrupt(GPIO91);
default_interrupt(GPIO92);
default_interrupt(GPIO93);
default_interrupt(GPIO94);
default_interrupt(GPIO95);
default_interrupt(GPIO96);
default_interrupt(GPIO97);
default_interrupt(GPIO98);
default_interrupt(GPIO99);
default_interrupt(GPIO100);
default_interrupt(GPIO101);
default_interrupt(GPIO102);
default_interrupt(GPIO103);
default_interrupt(GPIO104);
default_interrupt(GPIO105);
default_interrupt(GPIO106);
default_interrupt(GPIO107);
default_interrupt(GPIO108);
default_interrupt(GPIO109);
default_interrupt(GPIO110);
default_interrupt(GPIO111);
default_interrupt(GPIO112);
default_interrupt(GPIO113);
default_interrupt(GPIO114);
default_interrupt(GPIO115);
default_interrupt(GPIO116);
default_interrupt(GPIO117);
default_interrupt(GPIO118);
default_interrupt(GPIO119);
default_interrupt(GPIO120);
default_interrupt(GPIO121);
default_interrupt(GPIO122);
default_interrupt(GPIO123);
default_interrupt(GPIO124);
default_interrupt(GPIO125);
default_interrupt(GPIO126);
default_interrupt(GPIO127);
static void (* const irqvector[])(void) =
{
I2C,EMC,UHC,UIRQ,UIRQ,UIRQ,UIRQ,UIRQ,
UART0,UIRQ,UIRQ,SADC,UIRQ,MSC,RTC,SSI,
CIM,AIC,ETH,UIRQ,TCU2,TCU1,TCU0,UDC,
UIRQ,UIRQ,UIRQ,UIRQ,IPU,LCD,UIRQ,DMA0,
DMA1,DMA2,DMA3,DMA4,DMA5,UIRQ,UIRQ,UIRQ,
UIRQ,UIRQ,UIRQ,UIRQ,UIRQ,UIRQ,UIRQ,
GPIO0,GPIO1,GPIO2,GPIO3,GPIO4,GPIO5,GPIO6,GPIO7,
GPIO8,GPIO9,GPIO10,GPIO11,GPIO12,GPIO13,GPIO14,GPIO15,
GPIO16,GPIO17,GPIO18,GPIO19,GPIO20,GPIO21,GPIO22,GPIO23,
GPIO24,GPIO25,GPIO26,GPIO27,GPIO28,GPIO29,GPIO30,GPIO31,
GPIO32,GPIO33,GPIO34,GPIO35,GPIO36,GPIO37,GPIO38,GPIO39,
GPIO40,GPIO41,GPIO42,GPIO43,GPIO44,GPIO45,GPIO46,GPIO47,
GPIO48,GPIO49,GPIO50,GPIO51,GPIO52,GPIO53,GPIO54,GPIO55,
GPIO56,GPIO57,GPIO58,GPIO59,GPIO60,GPIO61,GPIO62,GPIO63,
GPIO64,GPIO65,GPIO66,GPIO67,GPIO68,GPIO69,GPIO70,GPIO71,
GPIO72,GPIO73,GPIO74,GPIO75,GPIO76,GPIO77,GPIO78,GPIO79,
GPIO80,GPIO81,GPIO82,GPIO83,GPIO84,GPIO85,GPIO86,GPIO87,
GPIO88,GPIO89,GPIO90,GPIO91,GPIO92,GPIO93,GPIO94,GPIO95,
GPIO96,GPIO97,GPIO98,GPIO99,GPIO100,GPIO101,GPIO102,GPIO103,
GPIO104,GPIO105,GPIO106,GPIO107,GPIO108,GPIO109,GPIO110,GPIO111,
GPIO112,GPIO113,GPIO114,GPIO115,GPIO116,GPIO117,GPIO118,GPIO119,
GPIO120,GPIO121,GPIO122,GPIO123,GPIO124,GPIO125,GPIO126,GPIO127
};
static unsigned int dma_irq_mask = 0;
static unsigned int gpio_irq_mask[4] = {0};
void system_enable_irq(unsigned int irq)
{
register unsigned int t;
if ((irq >= IRQ_GPIO_0) && (irq <= IRQ_GPIO_0 + NUM_GPIO))
{
__gpio_unmask_irq(irq - IRQ_GPIO_0);
t = (irq - IRQ_GPIO_0) >> 5;
gpio_irq_mask[t] |= (1 << ((irq - IRQ_GPIO_0) & 0x1f));
__intc_unmask_irq(IRQ_GPIO0 - t);
}
else if ((irq >= IRQ_DMA_0) && (irq <= IRQ_DMA_0 + NUM_DMA))
{
__dmac_channel_enable_irq(irq - IRQ_DMA_0);
dma_irq_mask |= (1 << (irq - IRQ_DMA_0));
__intc_unmask_irq(IRQ_DMAC);
}
else if (irq < 32)
__intc_unmask_irq(irq);
}
static void dis_irq(unsigned int irq)
{
register unsigned int t;
if ((irq >= IRQ_GPIO_0) && (irq <= IRQ_GPIO_0 + NUM_GPIO))
{
__gpio_mask_irq(irq - IRQ_GPIO_0);
t = (irq - IRQ_GPIO_0) >> 5;
gpio_irq_mask[t] &= ~(1 << ((irq - IRQ_GPIO_0) & 0x1f));
if (!gpio_irq_mask[t])
__intc_mask_irq(IRQ_GPIO0 - t);
}
else if ((irq >= IRQ_DMA_0) && (irq <= IRQ_DMA_0 + NUM_DMA))
{
__dmac_channel_disable_irq(irq - IRQ_DMA_0);
dma_irq_mask &= ~(1 << (irq - IRQ_DMA_0));
if (!dma_irq_mask)
__intc_mask_irq(IRQ_DMAC);
}
else if (irq < 32)
__intc_mask_irq(irq);
}
static void ack_irq(unsigned int irq)
{
if ((irq >= IRQ_GPIO_0) && (irq <= IRQ_GPIO_0 + NUM_GPIO))
{
__intc_ack_irq(IRQ_GPIO0 - ((irq - IRQ_GPIO_0)>>5));
__gpio_ack_irq(irq - IRQ_GPIO_0);
}
else if ((irq >= IRQ_DMA_0) && (irq <= IRQ_DMA_0 + NUM_DMA))
__intc_ack_irq(IRQ_DMAC);
else if (irq < 32)
__intc_ack_irq(irq);
}
static unsigned long ipl;
static int get_irq_number(void)
{
register int irq = 0;
ipl |= REG_INTC_IPR;
if (ipl == 0)
return -1;
/* find out the real irq defined in irq_xxx.c */
for (irq = 31; irq >= 0; irq--)
if (ipl & (1 << irq))
break;
if (irq < 0)
return -1;
ipl &= ~(1 << irq);
switch (irq)
{
case IRQ_GPIO0:
irq = __gpio_group_irq(0) + IRQ_GPIO_0;
break;
case IRQ_GPIO1:
irq = __gpio_group_irq(1) + IRQ_GPIO_0 + 32;
break;
case IRQ_GPIO2:
irq = __gpio_group_irq(2) + IRQ_GPIO_0 + 64;
break;
case IRQ_GPIO3:
irq = __gpio_group_irq(3) + IRQ_GPIO_0 + 96;
break;
case IRQ_DMAC:
irq = __dmac_get_irq() + IRQ_DMA_0;
break;
}
return irq;
}
void intr_handler(void)
{
int irq = get_irq_number();
if(UNLIKELY(irq < 0))
return;
ack_irq(irq);
if(LIKELY(irq > 0))
irqvector[irq-1]();
}
#define EXC(x,y) case (x): return (y);
static char* parse_exception(unsigned int cause)
{
switch(cause & M_CauseExcCode)
{
EXC(EXC_INT, "Interrupt");
EXC(EXC_MOD, "TLB Modified");
EXC(EXC_TLBL, "TLB Exception (Load or Ifetch)");
EXC(EXC_ADEL, "Address Error (Load or Ifetch)");
EXC(EXC_ADES, "Address Error (Store)");
EXC(EXC_TLBS, "TLB Exception (Store)");
EXC(EXC_IBE, "Instruction Bus Error");
EXC(EXC_DBE, "Data Bus Error");
EXC(EXC_SYS, "Syscall");
EXC(EXC_BP, "Breakpoint");
EXC(EXC_RI, "Reserved Instruction");
EXC(EXC_CPU, "Coprocessor Unusable");
EXC(EXC_OV, "Overflow");
EXC(EXC_TR, "Trap Instruction");
EXC(EXC_FPE, "Floating Point Exception");
EXC(EXC_C2E, "COP2 Exception");
EXC(EXC_MDMX, "MDMX Exception");
EXC(EXC_WATCH, "Watch Exception");
EXC(EXC_MCHECK, "Machine Check Exception");
EXC(EXC_CacheErr, "Cache error caused re-entry to Debug Mode");
default:
return NULL;
}
}
void exception_handler(void* stack_ptr, unsigned int cause, unsigned int epc)
{
panicf("Exception occurred: %s [0x%08x] at 0x%08x (stack at 0x%08x)", parse_exception(cause), cause, epc, (unsigned int)stack_ptr);
}
static const int FR2n[] = {1, 2, 3, 4, 6, 8, 12, 16, 24, 32};
static unsigned int iclk;
static void detect_clock(void)
{
unsigned int cfcr, pllout;
cfcr = REG_CPM_CPCCR;
pllout = (__cpm_get_pllm() + 2)* JZ_EXTAL / (__cpm_get_plln() + 2);
iclk = pllout / FR2n[__cpm_get_cdiv()];
}
void udelay(unsigned int usec)
{
unsigned int i = usec * (iclk / 2000000);
__asm__ __volatile__ (
".set noreorder \n"
"1: \n"
"bne %0, $0, 1b \n"
"addi %0, %0, -1 \n"
".set reorder \n"
: "=r" (i)
: "0" (i)
);
}
void mdelay(unsigned int msec)
{
unsigned int i;
for(i=0; i<msec; i++)
udelay(1000);
}
/* Core-level interrupt masking */
void cli(void)
{
register unsigned int t;
t = read_c0_status();
t &= ~1;
write_c0_status(t);
}
unsigned int mips_get_sr(void)
{
return read_c0_status();
}
void sti(void)
{
register unsigned int t;
t = read_c0_status();
t |= 1;
t &= ~2;
write_c0_status(t);
}
#define Index_Invalidate_I 0x00
#define Index_Writeback_Inv_D 0x01
#define Index_Load_Tag_I 0x04
#define Index_Load_Tag_D 0x05
#define Index_Store_Tag_I 0x08
#define Index_Store_Tag_D 0x09
#define Hit_Invalidate_I 0x10
#define Hit_Invalidate_D 0x11
#define Hit_Writeback_Inv_D 0x15
#define Hit_Writeback_I 0x18
#define Hit_Writeback_D 0x19
#define CACHE_SIZE 16*1024
#define CACHE_LINE_SIZE 32
#define KSEG0 0x80000000
#define SYNC_WB() __asm__ __volatile__ ("sync")
#define __CACHE_OP(op, addr) \
__asm__ __volatile__( \
" .set noreorder \n" \
" .set mips32\n\t \n" \
" cache %0, %1 \n" \
" .set mips0 \n" \
" .set reorder \n" \
: \
: "i" (op), "m" (*(unsigned char *)(addr)))
void __flush_dcache_line(unsigned long addr)
{
__CACHE_OP(Hit_Writeback_Inv_D, addr);
SYNC_WB();
}
void __icache_invalidate_all(void)
{
unsigned int i;
asm volatile (".set noreorder \n"
".set mips32 \n"
"mtc0 $0, $28 \n" /* TagLo */
"mtc0 $0, $29 \n" /* TagHi */
".set mips0 \n"
".set reorder \n"
);
for(i=KSEG0; i<KSEG0+CACHE_SIZE; i+=CACHE_LINE_SIZE)
__CACHE_OP(Index_Store_Tag_I, i);
/* invalidate btb */
asm volatile (
".set mips32 \n"
"mfc0 %0, $16, 7 \n"
"nop \n"
"ori %0, 2 \n"
"mtc0 %0, $16, 7 \n"
".set mips0 \n"
:
: "r" (i));
}
void __dcache_invalidate_all(void)
{
unsigned int i;
asm volatile (".set noreorder \n"
".set mips32 \n"
"mtc0 $0, $28 \n"
"mtc0 $0, $29 \n"
".set mips0 \n"
".set reorder \n"
);
for (i=KSEG0; i<KSEG0+CACHE_SIZE; i+=CACHE_LINE_SIZE)
__CACHE_OP(Index_Store_Tag_D, i);
}
void __dcache_writeback_all(void)
{
unsigned int i;
for(i=KSEG0; i<KSEG0+CACHE_SIZE; i+=CACHE_LINE_SIZE)
__CACHE_OP(Index_Writeback_Inv_D, i);
SYNC_WB();
}
void dma_cache_wback_inv(unsigned long addr, unsigned long size)
{
unsigned long end, a;
if (size >= CACHE_SIZE)
__dcache_writeback_all();
else
{
unsigned long dc_lsize = CACHE_LINE_SIZE;
a = addr & ~(dc_lsize - 1);
end = (addr + size - 1) & ~(dc_lsize - 1);
for(; a < end; a += dc_lsize)
__flush_dcache_line(a); /* Hit_Writeback_Inv_D */
}
}
#define BARRIER \
__asm__ __volatile__( \
" .set noreorder \n" \
" nop \n" \
" nop \n" \
" nop \n" \
" nop \n" \
" nop \n" \
" nop \n" \
" .set reorder \n");
#define DEFAULT_PAGE_SHIFT PL_4K
#define DEFAULT_PAGE_MASK PM_4K
#define UNIQUE_ENTRYHI(idx, ps) (A_K0BASE + ((idx) << (ps + 1)))
#define ASID_MASK M_EntryHiASID
#define VPN2_SHIFT S_EntryHiVPN2
#define PFN_SHIFT S_EntryLoPFN
#define PFN_MASK 0xffffff
static void local_flush_tlb_all(void)
{
unsigned long old_ctx;
int entry;
unsigned int old_irq = disable_irq_save();
/* Save old context and create impossible VPN2 value */
old_ctx = read_c0_entryhi();
write_c0_entrylo0(0);
write_c0_entrylo1(0);
BARRIER;
/* Blast 'em all away. */
for(entry = 0; entry < 32; entry++)
{
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(entry, DEFAULT_PAGE_SHIFT));
write_c0_index(entry);
BARRIER;
tlb_write_indexed();
}
BARRIER;
write_c0_entryhi(old_ctx);
restore_irq(old_irq);
}
static void add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
unsigned long entryhi, unsigned long pagemask)
{
unsigned long wired;
unsigned long old_pagemask;
unsigned long old_ctx;
unsigned int old_irq = disable_irq_save();
old_ctx = read_c0_entryhi() & ASID_MASK;
old_pagemask = read_c0_pagemask();
wired = read_c0_wired();
write_c0_wired(wired + 1);
write_c0_index(wired);
BARRIER;
write_c0_pagemask(pagemask);
write_c0_entryhi(entryhi);
write_c0_entrylo0(entrylo0);
write_c0_entrylo1(entrylo1);
BARRIER;
tlb_write_indexed();
BARRIER;
write_c0_entryhi(old_ctx);
BARRIER;
write_c0_pagemask(old_pagemask);
local_flush_tlb_all();
restore_irq(old_irq);
}
static void map_address(unsigned long virtual, unsigned long physical, unsigned long length)
{
unsigned long entry0 = (physical & PFN_MASK) << PFN_SHIFT;
unsigned long entry1 = ((physical+length) & PFN_MASK) << PFN_SHIFT;
unsigned long entryhi = virtual & ~VPN2_SHIFT;
entry0 |= (M_EntryLoG | M_EntryLoV | (K_CacheAttrC << S_EntryLoC) );
entry1 |= (M_EntryLoG | M_EntryLoV | (K_CacheAttrC << S_EntryLoC) );
add_wired_entry(entry0, entry1, entryhi, DEFAULT_PAGE_MASK);
}
static void tlb_init(void)
{
write_c0_pagemask(DEFAULT_PAGE_MASK);
write_c0_wired(0);
write_c0_framemask(0);
local_flush_tlb_all();
/*
map_address(0x80000000, 0x80000000, 0x4000);
map_address(0x80004000, 0x80004000, MEM * 0x100000);
*/
}
void tlb_refill_handler(void)
{
panicf("TLB refill handler at 0x%08lx! [0x%x]", read_c0_epc(), read_c0_badvaddr());
}
static void tlb_call_refill(void)
{
asm("la $8, tlb_refill_handler \n"
"jr $8 \n"
);
}
static int dma_count = 0;
void dma_enable(void)
{
if(++dma_count == 1)
{
__cpm_start_dmac();
REG_DMAC_DCCSR(0) = 0;
REG_DMAC_DCCSR(1) = 0;
REG_DMAC_DCCSR(2) = 0;
REG_DMAC_DCCSR(3) = 0;
REG_DMAC_DCCSR(4) = 0;
REG_DMAC_DCCSR(5) = 0;
REG_DMAC_DMACR = (DMAC_DMACR_PR_012345 | DMAC_DMACR_DMAE);
}
}
void dma_disable(void)
{
if(--dma_count == 0)
{
REG_DMAC_DMACR &= ~DMAC_DMACR_DMAE;
__cpm_stop_dmac();
}
}
static inline void pll_convert(unsigned int pllin, unsigned int *pll_cfcr, unsigned int *pll_plcr1)
{
register unsigned int cfcr, plcr1;
int div[5] = {1, 3, 3, 3, 3}; /* divisors of I:S:P:L:M */
int nf;
cfcr = CPM_CPCCR_CLKOEN |
(div[0] << CPM_CPCCR_CDIV_BIT) |
(div[1] << CPM_CPCCR_HDIV_BIT) |
(div[2] << CPM_CPCCR_PDIV_BIT) |
(div[3] << CPM_CPCCR_MDIV_BIT) |
(div[4] << CPM_CPCCR_LDIV_BIT);
//nf = pllin * 2 / CFG_EXTAL;
nf = pllin * 2 / 375299969;
plcr1 = ((nf - 2) << CPM_CPPCR_PLLM_BIT) | /* FD */
(0 << CPM_CPPCR_PLLN_BIT) | /* RD=0, NR=2 */
(0 << CPM_CPPCR_PLLOD_BIT) | /* OD=0, NO=1 */
(0xa << CPM_CPPCR_PLLST_BIT) | /* PLL stable time */
CPM_CPPCR_PLLEN; /* enable PLL */
/* init PLL */
*pll_cfcr = cfcr;
*pll_plcr1 = plcr1;
}
static inline void sdram_convert(unsigned int pllin, unsigned int *sdram_freq)
{
register unsigned int ns, tmp;
ns = 1000000000 / pllin;
tmp = 15625 / ns;
/* Set refresh registers */
tmp = tmp / 64 + 1;
if(tmp > 0xff)
tmp = 0xff;
*sdram_freq = tmp;
}
static inline void set_cpu_freq(unsigned int pllin, unsigned int div)
{
unsigned int sdram_freq;
unsigned int pll_cfcr, pll_plcr1;
int div_preq[] = {1, 2, 3, 4, 6, 8, 12, 16, 24, 32};
if(pllin < 25000000 || pllin > 420000000)
panicf("PLL should be >25000000 and <420000000 !");
unsigned long t = read_c0_status();
write_c0_status(t & ~1);
pll_convert(pllin, &pll_cfcr, &pll_plcr1);
sdram_convert(pllin / div_preq[div], &sdram_freq);
REG_CPM_CPCCR &= ~CPM_CPCCR_CE;
REG_CPM_CPCCR = pll_cfcr;
REG_CPM_CPPCR = pll_plcr1;
REG_EMC_RTCOR = sdram_freq;
REG_EMC_RTCNT = sdram_freq;
REG_CPM_CPCCR |= CPM_CPCCR_CE;
detect_clock();
write_c0_status(t);
}
static void OF_init_clocks(void)
{
unsigned int prog_entry = ((unsigned int)OF_init_clocks >> 5) << 5;
unsigned int i, prog_size = 1024;
for(i = prog_entry; i < prog_entry + prog_size; i += 32)
__asm__ __volatile__("cache 0x1c, 0x00(%0) \n"
:
: "r" (i)
);
/* disable PLL clock */
REG_CPM_CPPCR &= ~CPM_CPPCR_PLLEN;
REG_CPM_CPCCR |= CPM_CPCCR_CE;
unsigned long old_clocks = REG_CPM_CLKGR;
/*
REG_CPM_CLKGR = ~( CPM_CLKGR_UART0 | CPM_CLKGR_TCU |
CPM_CLKGR_RTC | CPM_CLKGR_SADC |
CPM_CLKGR_LCD );
*/
unsigned long old_scr = REG_CPM_SCR;
REG_CPM_SCR &= ~CPM_SCR_OSC_ENABLE; /* O1SE: 12M oscillator is disabled in Sleep mode */
REG_EMC_DMCR |= (EMC_DMCR_RMODE | EMC_DMCR_RFSH); /* self refresh + refresh is performed */
REG_EMC_DMCR = (REG_EMC_DMCR & ~EMC_DMCR_RMODE) | 1; /* -> RMODE = auto refresh
-> CAS mode = 2 cycles */
__asm__ __volatile__("wait \n");
REG_CPM_CLKGR = old_clocks;
REG_CPM_SCR = old_scr;
for(i=0; i<90; i++);
set_cpu_freq(336000000, 1);
for(i=0; i<60; i++);
}
static void my_init_clocks(void)
{
unsigned long t = read_c0_status();
write_c0_status(t & ~1);
unsigned int prog_entry = ((unsigned int)my_init_clocks / 32 - 1) * 32;
unsigned int i, prog_size = 1024;
for(i = prog_entry; i < prog_entry + prog_size; i += 32)
__asm__ __volatile__("cache 0x1c, 0x00(%0) \n"
:
: "r" (i)
);
unsigned int sdram_freq, plcr1, cfcr;
sdram_convert(336000000/3, &sdram_freq);
cfcr = CPM_CPCCR_CLKOEN |
(6 << CPM_CPCCR_UDIV_BIT) |
CPM_CPCCR_UCS |
CPM_CPCCR_PCS |
(0 << CPM_CPCCR_CDIV_BIT) |
(2 << CPM_CPCCR_HDIV_BIT) |
(2 << CPM_CPCCR_PDIV_BIT) |
(2 << CPM_CPCCR_MDIV_BIT) |
(2 << CPM_CPCCR_LDIV_BIT);
plcr1 = (54 << CPM_CPPCR_PLLM_BIT) | /* FD */
(0 << CPM_CPPCR_PLLN_BIT) | /* RD=0, NR=2 */
(0 << CPM_CPPCR_PLLOD_BIT) | /* OD=0, NO=1 */
(0x20 << CPM_CPPCR_PLLST_BIT)| /* PLL stable time */
CPM_CPPCR_PLLEN; /* enable PLL */
REG_CPM_CPCCR &= ~CPM_CPCCR_CE;
REG_CPM_CPCCR = cfcr;
REG_CPM_CPPCR = plcr1;
REG_EMC_RTCOR = sdram_freq;
REG_EMC_RTCNT = sdram_freq;
REG_CPM_CPCCR |= CPM_CPCCR_CE;
REG_CPM_LPCDR = (REG_CPM_LPCDR & ~CPM_LPCDR_PIXDIV_MASK) | (11 << CPM_LPCDR_PIXDIV_BIT);
write_c0_status(t);
}
extern int main(void);
extern void except_common_entry(void);
void system_main(void)
{
int i;
/*
* 0x0 - Simple TLB refill handler
* 0x100 - Cache error handler
* 0x180 - Exception/Interrupt handler
* 0x200 - Special Exception Interrupt handler (when IV is set in CP0_CAUSE)
*/
memcpy((void *)A_K0BASE, (void *)&tlb_call_refill, 0x20);
memcpy((void *)(A_K0BASE + 0x100), (void *)&except_common_entry, 0x20);
memcpy((void *)(A_K0BASE + 0x180), (void *)&except_common_entry, 0x20);
memcpy((void *)(A_K0BASE + 0x200), (void *)&except_common_entry, 0x20);
__dcache_writeback_all();
__icache_invalidate_all();
write_c0_status(1 << 28 | 1 << 10 ); /* Enable CP | Mask interrupt 2 */
/* Disable all interrupts */
for(i=0; i<IRQ_MAX; i++)
dis_irq(i);
tlb_init();
detect_clock();
/* Disable unneeded clocks, clocks are enabled when needed */
__cpm_stop_all();
__cpm_suspend_usbhost();
#if 0
my_init_clocks();
/*__cpm_stop_udc();
REG_CPM_CPCCR |= CPM_CPCCR_UCS;
REG_CPM_CPCCR = (REG_CPM_CPCCR & ~CPM_CPCCR_UDIV_MASK) | (3 << CPM_CPCCR_UDIV_BIT);
__cpm_start_udc();*/
#endif
/* Enable interrupts at core level */
sti();
main(); /* Shouldn't return */
while(1);
}
void system_reboot(void)
{
REG_WDT_TCSR = WDT_TCSR_PRESCALE4 | WDT_TCSR_EXT_EN;
REG_WDT_TCNT = 0;
REG_WDT_TDR = JZ_EXTAL/1000; /* reset after 4ms */
REG_TCU_TSCR = TCU_TSSR_WDTSC; /* enable wdt clock */
REG_WDT_TCER = WDT_TCER_TCEN; /* wdt start */
while (1);
}
void system_exception_wait(void)
{
/* check for power button without including any .h file */
while (1)
{
if( (~(*(volatile unsigned int *)(0xB0010300))) & (1 << 29) )
break;
}
}
void power_off(void)
{
/* Put system into hibernate mode */
__rtc_clear_alarm_flag();
__rtc_clear_hib_stat_all();
/* __rtc_set_scratch_pattern(0x12345678); */
__rtc_enable_alarm_wakeup();
__rtc_set_hrcr_val(0xfe0);
__rtc_set_hwfcr_val((0xFFFF << 4));
__rtc_power_down();
while(1);
}
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