C++ sdram_init函数代码示例

void board_init_f(ulong bootflag)
{
	u32 plat_ratio, ddr_ratio;
	unsigned long bus_clk;
	ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;

	/* initialize selected port with appropriate baud rate */
	plat_ratio = in_be32(&gur->porpllsr) & MPC85xx_PORPLLSR_PLAT_RATIO;
	plat_ratio >>= 1;
	bus_clk = CONFIG_SYS_CLK_FREQ * plat_ratio;

	ddr_ratio = in_be32(&gur->porpllsr) & MPC85xx_PORPLLSR_DDR_RATIO;
	ddr_ratio = ddr_ratio >> MPC85xx_PORPLLSR_DDR_RATIO_SHIFT;
	ddr_freq_mhz = (CONFIG_SYS_CLK_FREQ * ddr_ratio) / 0x1000000;

	NS16550_init((NS16550_t)CONFIG_SYS_NS16550_COM1,
			bus_clk / 16 / CONFIG_BAUDRATE);

	puts("\nNAND boot... ");

	/* Initialize the DDR3 */
	sdram_init();

	/* copy code to RAM and jump to it - this should not return */
	/* NOTE - code has to be copied out of NAND buffer before
	 * other blocks can be read.
	 */
	relocate_code(CONFIG_SYS_NAND_U_BOOT_RELOC_SP, 0,
			CONFIG_SYS_NAND_U_BOOT_RELOC);
}

void main(void)
{
	timestamp_add_now(TS_START_ROMSTAGE);

	console_init();
	configure_l2ctlr();
	tsadc_init();

	/* vdd_log 1200mv is enough for ddr run 666Mhz */
	regulate_vdd_log(1200);

	timestamp_add_now(TS_BEFORE_INITRAM);

	sdram_init(get_sdram_config());

	timestamp_add_now(TS_AFTER_INITRAM);

	/* Now that DRAM is up, add mappings for it and DMA coherency buffer. */
	mmu_config_range((uintptr_t)_dram/MiB,
			 sdram_size_mb(), DCACHE_WRITEBACK);
	mmu_config_range((uintptr_t)_dma_coherent/MiB,
			 _dma_coherent_size/MiB, DCACHE_OFF);

	cbmem_initialize_empty();

	timestamp_add_now(TS_END_ROMSTAGE);

	run_ramstage();
}

int mymain(void)
{	
	// beep off
	GPBCON = 0x1;	// output
	GPBDAT = 0x0;	// Tout = 0;
	
	// watchdog timer off
	WTCON = 0;
		
	uart_init();
	uart_putchar('a');
	
	sdram_init();
	
	*(int *)TEST = 0x12345678;
	
	print_addr(TEST);

	while (1)
	{
		char c;
		
		c = uart_getchar();			
		uart_putchar(c);			
	}
	
	while (1);
	
	return 0;
}

long int initdram (int board_type)
{
	volatile immap_t *im = (immap_t *)CFG_IMMR;
	u32 msize = 0;

	if ((im->sysconf.immrbar & IMMRBAR_BASE_ADDR) != (u32)im)
		return -1;

	/* DDR SDRAM - Main SODIMM */
	im->sysconf.ddrlaw[0].bar = CFG_DDR_BASE & LAWBAR_BAR;
#if defined(CONFIG_SPD_EEPROM)
	msize = spd_sdram();
#else
	msize = fixed_sdram();
#endif
	/*
	 * Initialize SDRAM if it is on local bus.
	 */
	sdram_init();

#if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
	/*
	 * Initialize and enable DDR ECC.
	 */
	ddr_enable_ecc(msize * 1024 * 1024);
#endif

	/* return total bus SDRAM size(bytes)  -- DDR */
	return (msize * 1024 * 1024);
}

static void main(unsigned long bist)
{
	pc97317_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
	uart_init();
	console_init();

	/* Halt if there was a built in self test failure */
	report_bist_failure(bist);

	cs5530_enable_rom();

	sdram_init();

	/* Check all of memory */
#if 0
	ram_check(0x00000000, msr.lo);
#endif
#if 0
	static const struct {
		unsigned long lo, hi;
	} check_addrs[] = {
		/* Check 16MB of memory @ 0*/
		{ 0x00000000, 0x01000000 },
#if TOTAL_CPUS > 1
		/* Check 16MB of memory @ 2GB */
		{ 0x80000000, 0x81000000 },
#endif
	};
	int i;
	for(i = 0; i < ARRAY_SIZE(check_addrs); i++) {
		ram_check(check_addrs[i].lo, check_addrs[i].hi);
	}
#endif
}

TestDisplay::TestDisplay(WhichDisplay which) : 
    _initStr(NULL),
    _lcdCfg(NULL),
    _lcdBoard(P0_27, P0_28),
    _touch(P0_27, P0_28, P2_25) {
    
    switch (which) {
        case TFT_5:
            _lcdCfg = new LcdController::Config(LCD_CONFIGURATION_50);
            _initStr = LCD_INIT_STRING_50;
            break;
        case TFT_4_3:
            _lcdCfg = new LcdController::Config(LCD_CONFIGURATION_43);
            _initStr = LCD_INIT_STRING_43;
            break;
        default:
            mbed_die();
    }
            
    if (sdram_init() == 1) {
        printf("Failed to initialize SDRAM\n");
        _framebuffer = 0;
    } else {
        _framebuffer = (uint32_t) malloc(_lcdCfg->width * _lcdCfg->height * 2 * 3); // 2 is for 16 bit color, 3 is the number of buffers
        if (_framebuffer != 0) {
            memset((uint8_t*)_framebuffer, 0, _lcdCfg->width * _lcdCfg->height * 2 * 3);
        }
    }
}

static void main(unsigned long bist)
{
	pc87351_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
	console_init();
	report_bist_failure(bist);
	cs5530_enable_rom();
	sdram_init();
}

static bool sdramiodev_init(struct cyg_devtab_entry *tab)
{
    int stat = sdram_init();
//diag_printf("sdramiodev_init\n");
    if ( stat == 0 )
        return true;
    else
        return false;
}

void board_init_f(ulong bootflag)
{
	u32 plat_ratio;
	ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
#ifndef CONFIG_QE
	ccsr_gpio_t *pgpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
#elif defined(CONFIG_P1021RDB)
	par_io_t *par_io = (par_io_t *) &(gur->qe_par_io);
#endif

	/* initialize selected port with appropriate baud rate */
	plat_ratio = in_be32(&gur->porpllsr) & MPC85xx_PORPLLSR_PLAT_RATIO;
	plat_ratio >>= 1;
	bus_clk = CONFIG_SYS_CLK_FREQ * plat_ratio;

	NS16550_init((NS16550_t)CONFIG_SYS_NS16550_COM1,
			bus_clk / 16 / CONFIG_BAUDRATE);

	puts("\nNAND boot... ");

#ifndef CONFIG_QE
	/* init DDR3 reset signal */
	puts("\nDDR & BCM56445 reset... ");
	__raw_writel(0x02210000, &pgpio->gpdir);
	__raw_writel(0x00210000, &pgpio->gpodr);
	__raw_writel(0x00000000, &pgpio->gpdat);
	udelay(20000);
	__raw_writel(0x00210000, &pgpio->gpdat);
	udelay(20000);
	__raw_writel(0x00000000, &pgpio->gpdir);
#elif defined(CONFIG_P1021RDB)
	/* init DDR3 reset signal CE_PB8 */
	out_be32(&par_io[1].cpdir1, 0x00004000);
	out_be32(&par_io[1].cpodr, 0x00800000);
	out_be32(&par_io[1].cppar1, 0x00000000);
	/* reset DDR3 */
	out_be32(&par_io[1].cpdat, 0x00800000);
	udelay(1000);
	out_be32(&par_io[1].cpdat, 0x00000000);
	udelay(1000);
	out_be32(&par_io[1].cpdat, 0x00800000);
	/* disable the CE_PB8 */
	out_be32(&par_io[1].cpdir1, 0x00000000);
#endif

	//sdram_reset();
	/* Initialize the DDR3 */
	sdram_init();
	puts("\nsdram_init ok... ");

	/* copy code to RAM and jump to it - this should not return */
	/* NOTE - code has to be copied out of NAND buffer before
	 * other blocks can be read.
	 */
	relocate_code(CONFIG_SYS_NAND_U_BOOT_RELOC_SP, 0,
			CONFIG_SYS_NAND_U_BOOT_RELOC);
}

void board_init_f(ulong dummy)
{
	/* Set global data pointer */
	gd = &gdata;

	/* Setup global info */
#ifndef CONFIG_CMD_BURN
	gd->arch.gi = &ginfo;
#else
	gd->arch.gi = (struct global_info *)CONFIG_SPL_GINFO_BASE;
#endif
	gpio_init();

#ifndef CONFIG_FPGA
	/* Init uart first */
	enable_uart_clk();
#endif

#ifdef CONFIG_SPL_SERIAL_SUPPORT
	preloader_console_init();
#endif

#ifndef CONFIG_FPGA
	debug("Timer init\n");
	timer_init();

#ifdef CONFIG_SPL_REGULATOR_SUPPORT
	debug("regulator set\n");
	spl_regulator_set();
#endif

	debug("CLK stop\n");
	clk_prepare();

	debug("PLL init\n");
	pll_init();

	debug("CLK init\n");
	clk_init();
#endif

	debug("SDRAM init\n");
	sdram_init();
	debug("SDRAM init ok\n");

#ifdef CONFIG_DDR_TEST
	ddr_basic_tests();
#endif

#ifndef CONFIG_BURNER
	/* Clear the BSS */
	memset(__bss_start, 0, (char *)&__bss_end - __bss_start);
	debug("board_init_r\n");
	board_init_r(NULL, 0);
#endif
}

static void main(unsigned long bist)
{
	w83977f_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
	uart_init();
	console_init();
	report_bist_failure(bist);
	cs5530_enable_rom();
	sdram_init();
	/* ram_check(0, 640 * 1024); */
}

void board_init_f(ulong dummy)
{
	hw_data_init();
	early_system_init();
	board_early_init_f();
	sdram_init();
	/* dram_init must store complete ramsize in gd->ram_size */
	gd->ram_size = get_ram_size(
			(void *)CONFIG_SYS_SDRAM_BASE,
			CONFIG_MAX_RAM_BANK_SIZE);
}

phys_size_t initdram (int board_type)
{
	/*
	 * ToDo: Move the asm init routine sdram_init() to this C file,
	 * or even better use some common ppc4xx code available
	 * in cpu/ppc4xx
	 */
	sdram_init();

	return get_dram_size ();
}

int dram_init(void)
{
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
    sdram_init();
#endif

    /* dram_init must store complete ramsize in gd->ram_size */
    gd->ram_size = get_ram_size(
                       (void *)CONFIG_SYS_SDRAM_BASE,
                       CONFIG_MAX_RAM_BANK_SIZE);
    return 0;
}

/*
 * Check if we are executing rtc-only + DDR mode, and resume from it if needed
 */
static void rtc_only(void)
{
	struct davinci_rtc *rtc = (struct davinci_rtc *)RTC_BASE;
	struct prm_device_inst *prm_device =
				(struct prm_device_inst *)PRM_DEVICE_INST;

	u32 scratch1;
	void (*resume_func)(void);

	scratch1 = readl(&rtc->scratch1);

	/*
	 * Check RTC scratch against RTC_MAGIC_VAL, RTC_MAGIC_VAL is only
	 * written to this register when we want to wake up from RTC only
	 * with DDR in self-refresh mode. Contents of the RTC_SCRATCH1:
	 * bits 0-15:  RTC_MAGIC_VAL
	 * bits 16-31: board type (needed for sdram_init)
	 */
	if ((scratch1 & 0xffff) != RTC_MAGIC_VAL)
		return;

	rtc32k_unlock(rtc);

	/* Clear RTC magic */
	writel(0, &rtc->scratch1);

	/*
	 * Update board type based on value stored on RTC_SCRATCH1, this
	 * is done so that we don't need to read the board type from eeprom
	 * over i2c bus which is expensive
	 */
	rtc_only_update_board_type(scratch1 >> RTC_BOARD_TYPE_SHIFT);

	/*
	 * Enable EMIF_DEVOFF in PRCM_PRM_EMIF_CTRL to indicate to EMIF we
	 * are resuming from self-refresh. This avoids an unnecessary re-init
	 * of the DDR. The re-init takes time and we would need to wait for
	 * it to complete before accessing DDR to avoid L3 NOC errors.
	 */
	writel(EMIF_CTRL_DEVOFF, &prm_device->emif_ctrl);

	rtc_only_prcm_init();
	sdram_init();

	/* Disable EMIF_DEVOFF for normal operation and to exit self-refresh */
	writel(0, &prm_device->emif_ctrl);

	resume_func = (void *)readl(&rtc->scratch0);
	if (resume_func)
		resume_func();
}