/*************************************************************************** * __________ __ ___. * 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 "config.h" #include "kernel.h" #include "system.h" #include "panic.h" #include "ascodec-target.h" #include "adc.h" #include "dma-target.h" #include "clock-target.h" #include "fmradio_i2c.h" #include "button-target.h" #ifndef BOOTLOADER #include "mmu-arm.h" #endif #include "backlight-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 */ /* INT_GPIOA is declared in this file */ void INT_GPIOA(void); default_interrupt(INT_GPIOB); default_interrupt(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; if(status == 0) panicf("Unhandled IRQ (source unknown!)"); while((status >>= 1)) irq_no++; panicf("Unhandled IRQ %02X: %s", irq_no, irqname[irq_no]); } struct vec_int_src { int source; void (*isr) (void); }; /* Vectored interrupts (16 available) */ struct vec_int_src vec_int_srcs[] = { { INT_SRC_TIMER1, INT_TIMER1 }, { INT_SRC_TIMER2, INT_TIMER2 }, { INT_SRC_DMAC, INT_DMAC }, { INT_SRC_NAND, INT_NAND }, { INT_SRC_I2C_AUDIO, INT_I2C_AUDIO }, { INT_SRC_AUDIO, INT_AUDIO }, #if (defined HAVE_MULTIDRIVE && CONFIG_CPU == AS3525) { INT_SRC_MCI0, INT_MCI0 }, #endif #ifdef HAVE_HOTSWAP { INT_SRC_GPIOA, INT_GPIOA, }, #endif #ifdef HAVE_RECORDING { INT_SRC_I2SIN, INT_I2SIN, }, #endif }; static void setup_vic(void) { volatile unsigned long *vic_vect_addrs = VIC_VECT_ADDRS; volatile unsigned long *vic_vect_cntls = VIC_VECT_CNTLS; const unsigned int n = sizeof(vec_int_srcs)/sizeof(vec_int_srcs[0]); unsigned int i; CGU_PERI |= CGU_VIC_CLOCK_ENABLE; /* enable VIC */ VIC_INT_EN_CLEAR = 0xffffffff; /* disable all interrupt lines */ VIC_INT_SELECT = 0; /* only IRQ, no FIQ */ VIC_DEF_VECT_ADDR = (unsigned long)UIRQ; for(i = 0; i < n; i++) { vic_vect_addrs[i] = (unsigned long)vec_int_srcs[i].isr; vic_vect_cntls[i] = (1<<5) | vec_int_srcs[i].source; } } void INT_GPIOA(void) { #ifdef HAVE_MULTIDRIVE void sd_gpioa_isr(void); sd_gpioa_isr(); #endif #if (defined(HAVE_SCROLLWHEEL) && CONFIG_CPU != AS3525) void button_gpioa_isr(void); button_gpioa_isr(); #endif } void irq_handler(void) { asm volatile( "stmfd sp!, {r0-r5,ip,lr} \n" /* Store context */ "ldr r5, =0xC6010030 \n" /* VIC_VECT_ADDR */ "mov lr, pc \n" /* Return from ISR */ "ldr pc, [r5] \n" /* execute ISR */ "str r0, [r5] \n" /* Ack interrupt */ "ldmfd sp!, {r0-r5,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" ); } #if defined(SANSA_C200V2) #include "dbop-as3525.h" int c200v2_variant = 0; static void check_model_variant(void) { unsigned int i; unsigned int saved_dir = GPIOA_DIR; /* Make A7 input */ GPIOA_DIR &= ~(1<<7); /* wait a little to allow the pullup/pulldown resistor * to charge the input capacitance */ for (i=0; i<1000; i++) asm volatile ("nop\n"); /* read the pullup/pulldown value on A7 to determine the variant */ if (GPIOA_PIN(7) == 0) { /* * Backlight on A7. */ c200v2_variant = 1; } else { /* * Backlight on A5. */ c200v2_variant = 0; } GPIOA_DIR = saved_dir; } #else static inline void check_model_variant(void) { } #endif /* SANSA_C200V2*/ #if defined(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 |= (CGU_EXTMEM_CLOCK_ENABLE|CGU_EXTMEMIF_CLOCK_ENABLE); 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) || defined(SANSA_C200V2) /* 16 bits external bus, low power SDRAM, 16 Mbits = 2 Mbytes */ #define MEMORY_MODEL 0x21 #elif defined(SANSA_E200V2) || defined(SANSA_FUZE) || defined(SANSA_CLIPV2) \ || defined(SANSA_CLIPPLUS) || defined(SANSA_FUZEV2) /* 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 */ /* program the SDRAM mode register */ /* FIXME: details the exact settings of mode register */ asm volatile( "ldr r4, [%0]\n" : : "p"(0x30000000+0x2300*MEM) : "r4"); MPMC_DYNAMIC_CONTROL = 0x2; /* SDRAM NORMAL, MPMCCLKOUT runs continuously */ MPMC_DYNAMIC_CONFIG_0 |= (1<<19); /* buffer enable */ } #endif /* BOOTLOADER */ void system_init(void) { #if CONFIG_CPU == AS3525v2 CCU_SRC = 0x57D7BF0; #else CCU_SRC = 0x1fffff0 & ~CCU_SRC_IDE_EN; /* FIXME */ #endif unsigned int reset_loops = 640; while(reset_loops--) CCU_SRL = CCU_SRL_MAGIC_NUMBER; CCU_SRC = CCU_SRL = 0; CCU_SCON = 1; /* AHB master's priority configuration : TIC (Test Interface Controller) > DMA > USB > IDE > ARM */ CGU_PROC = 0; /* fclk 24 MHz */ #if CONFIG_CPU == AS3525v2 /* pclk is always based on PLLA, since we don't know the current PLLA speed, * avoid having pclk too fast and hope it's not too low */ CGU_PERI |= 0xf << 2; /* pclk lowest */ #else CGU_PERI &= ~0x7f; /* pclk 24 MHz */ #endif /* bits 31:30 should be set to 0 in arm926-ejs */ asm volatile( "mrc p15, 0, r0, c1, c0 \n" /* control register */ "bic r0, r0, #3<<30 \n" /* clears bus bits : sets fastbus */ "mcr p15, 0, r0, c1, c0 \n" : : : "r0" ); CGU_COUNTA = 0xff; CGU_PLLA = AS3525_PLLA_SETTING; CGU_PLLASUP = 0; /* enable PLLA */ while(!(CGU_INTCTRL & (1<<0))); /* wait until PLLA is locked */ #if (AS3525_MCLK_SEL == AS3525_CLK_PLLB) CGU_COUNTB = 0xff; CGU_PLLB = AS3525_PLLB_SETTING; CGU_PLLBSUP = 0; /* enable PLLB */ while(!(CGU_INTCTRL & (1<<1))); /* wait until PLLB is locked */ #endif /* Set FCLK frequency */ CGU_PROC = ((AS3525_FCLK_POSTDIV << 4) | (AS3525_FCLK_PREDIV << 2) | AS3525_FCLK_SEL); /* Set PCLK frequency */ CGU_PERI = ((CGU_PERI & ~0x7F) | /* reset divider & clksel bits */ (AS3525_PCLK_DIV0 << 2) | #if CONFIG_CPU == AS3525 (AS3525_PCLK_DIV1 << 6) | #endif AS3525_PCLK_SEL); #ifdef BOOTLOADER sdram_init(); #endif /* BOOTLOADER */ #if 0 /* the GPIO clock is already enabled by the dualboot function */ CGU_PERI |= CGU_GPIO_CLOCK_ENABLE; #endif /* enable timer interface for TIMER1 & TIMER2 */ CGU_PERI |= CGU_TIMERIF_CLOCK_ENABLE; setup_vic(); dma_init(); ascodec_init(); #ifndef BOOTLOADER /* setup isr for microsd monitoring and for scrollwheel irq */ #if defined(HAVE_MULTIDRIVE) || (defined(HAVE_SCROLLWHEEL) && CONFIG_CPU != AS3525) VIC_INT_ENABLE = (INTERRUPT_GPIOA); /* pin selection for irq happens in the drivers */ #endif /* Initialize power management settings */ ascodec_write(AS3514_CVDD_DCDC3, AS314_CP_DCDC3_SETTING); #if CONFIG_TUNER fmradio_i2c_init(); #endif #endif /* !BOOTLOADER */ check_model_variant(); } void system_reboot(void) { _backlight_off(); /* use watchdog to reset */ CGU_PERI |= (CGU_WDOCNT_CLOCK_ENABLE | CGU_WDOIF_CLOCK_ENABLE); WDT_LOAD = 1; /* set counter to 1 */ WDT_CONTROL = 3; /* enable watchdog counter & reset */ while(1); } void system_exception_wait(void) { /* wait until button release (if a button is pressed) */ while(button_read_device()); /* then wait until next button press */ while(!button_read_device()); } int system_memory_guard(int newmode) { (void)newmode; return 0; } #ifndef BOOTLOADER #ifdef HAVE_ADJUSTABLE_CPU_FREQ #if CONFIG_CPU == AS3525 void set_cpu_frequency(long frequency) { if(frequency == CPUFREQ_MAX) { #ifdef HAVE_ADJUSTABLE_CPU_VOLTAGE /* Increasing frequency so boost voltage before change */ ascodec_write(AS3514_CVDD_DCDC3, (AS314_CP_DCDC3_SETTING | CVDD_1_20)); /* Some players run a bit low so use 1.175 volts instead of 1.20 */ /* Wait for voltage to be at least 1.175v before making fclk > 200 MHz */ while(adc_read(ADC_CVDD) < 470); /* 470 * .0025 = 1.175V */ #endif /* HAVE_ADJUSTABLE_CPU_VOLTAGE */ asm volatile( "mrc p15, 0, r0, c1, c0 \n" #ifdef ASYNCHRONOUS_BUS "orr r0, r0, #3<<30 \n" /* asynchronous bus clocking */ #else "bic r0, r0, #3<<30 \n" /* clear bus bits */ "orr r0, r0, #1<<30 \n" /* synchronous bus clocking */ #endif "mcr p15, 0, r0, c1, c0 \n" : : : "r0" ); cpu_frequency = CPUFREQ_MAX; } else { asm volatile( "mrc p15, 0, r0, c1, c0 \n" "bic r0, r0, #3<<30 \n" /* fastbus clocking */ "mcr p15, 0, r0, c1, c0 \n" : : : "r0" ); #ifdef HAVE_ADJUSTABLE_CPU_VOLTAGE /* Decreasing frequency so reduce voltage after change */ ascodec_write(AS3514_CVDD_DCDC3, (AS314_CP_DCDC3_SETTING | CVDD_1_10)); #endif /* HAVE_ADJUSTABLE_CPU_VOLTAGE */ cpu_frequency = CPUFREQ_NORMAL; } } #else /* as3525v2 */ void set_cpu_frequency(long frequency) { int oldstatus = disable_irq_save(); /* We only have 2 settings */ cpu_frequency = (frequency == CPUFREQ_MAX) ? frequency : CPUFREQ_NORMAL; if(frequency == CPUFREQ_MAX) { /* Change PCLK while FCLK is low, so it doesn't go too high */ CGU_PERI = (CGU_PERI & ~(0xF << 2)) | (AS3525_PCLK_DIV0 << 2); CGU_PROC = ((AS3525_FCLK_POSTDIV << 4) | (AS3525_FCLK_PREDIV << 2) | AS3525_FCLK_SEL); } else { CGU_PROC = ((AS3525_FCLK_POSTDIV_UNBOOSTED << 4) | (AS3525_FCLK_PREDIV << 2) | AS3525_FCLK_SEL); /* Change PCLK after FCLK is low, so it doesn't go too high */ CGU_PERI = (CGU_PERI & ~(0xF << 2)) | (AS3525_PCLK_DIV0_UNBOOSTED << 2); } restore_irq(oldstatus); } #endif #endif /* HAVE_ADJUSTABLE_CPU_FREQ */ #endif /* !BOOTLOADER */