/* * initcode.c - Initialize the processor. This is usually entails things * like external memory, voltage regulators, etc... Note that this file * cannot make any function calls as it may be executed all by itself by * the Blackfin's bootrom in LDR format. * * Copyright (c) 2004-2008 Analog Devices Inc. * * Licensed under the GPL-2 or later. */ #include #include #include #include #include #include #include #define BFIN_IN_INITCODE #include "serial.h" __attribute__((always_inline)) static inline void serial_init(void) { #ifdef __ADSPBF54x__ # ifdef BFIN_BOOT_UART_USE_RTS # define BFIN_UART_USE_RTS 1 # else # define BFIN_UART_USE_RTS 0 # endif if (BFIN_UART_USE_RTS && CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_UART) { size_t i; /* force RTS rather than relying on auto RTS */ bfin_write_UART1_MCR(bfin_read_UART1_MCR() | FCPOL); /* Wait for the line to clear up. We cannot rely on UART * registers as none of them reflect the status of the RSR. * Instead, we'll sleep for ~10 bit times at 9600 baud. * We can precalc things here by assuming boot values for * PLL rather than loading registers and calculating. * baud = SCLK / (16 ^ (1 - EDBO) * Divisor) * EDB0 = 0 * Divisor = (SCLK / baud) / 16 * SCLK = baud * 16 * Divisor * SCLK = (0x14 * CONFIG_CLKIN_HZ) / 5 * CCLK = (16 * Divisor * 5) * (9600 / 10) * In reality, this will probably be just about 1 second delay, * so assuming 9600 baud is OK (both as a very low and too high * speed as this will buffer things enough). */ #define _NUMBITS (10) /* how many bits to delay */ #define _LOWBAUD (9600) /* low baud rate */ #define _SCLK ((0x14 * CONFIG_CLKIN_HZ) / 5) /* SCLK based on PLL */ #define _DIVISOR ((_SCLK / _LOWBAUD) / 16) /* UART DLL/DLH */ #define _NUMINS (3) /* how many instructions in loop */ #define _CCLK (((16 * _DIVISOR * 5) * (_LOWBAUD / _NUMBITS)) / _NUMINS) i = _CCLK; while (i--) asm volatile("" : : : "memory"); } #endif if (BFIN_DEBUG_EARLY_SERIAL) { int ucen = *pUART_GCTL & UCEN; serial_early_init(); /* If the UART is off, that means we need to program * the baud rate ourselves initially. */ if (ucen != UCEN) serial_early_set_baud(CONFIG_BAUDRATE); } } __attribute__((always_inline)) static inline void serial_deinit(void) { #ifdef __ADSPBF54x__ if (BFIN_UART_USE_RTS && CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_UART) { /* clear forced RTS rather than relying on auto RTS */ bfin_write_UART1_MCR(bfin_read_UART1_MCR() & ~FCPOL); } #endif } __attribute__((always_inline)) static inline void serial_putc(char c) { if (!BFIN_DEBUG_EARLY_SERIAL) return; if (c == '\n') *pUART_THR = '\r'; *pUART_THR = c; while (!(*pUART_LSR & TEMT)) continue; } /* Max SCLK can be 133MHz ... dividing that by (2*4) gives * us a freq of 16MHz for SPI which should generally be * slow enough for the slow reads the bootrom uses. */ #if !defined(CONFIG_SPI_FLASH_SLOW_READ) && \ ((defined(__ADSPBF52x__) && __SILICON_REVISION__ >= 2) || \ (defined(__ADSPBF54x__) && __SILICON_REVISION__ >= 1)) # define BOOTROM_SUPPORTS_SPI_FAST_READ 1 #else # define BOOTROM_SUPPORTS_SPI_FAST_READ 0 #endif #ifndef CONFIG_SPI_BAUD_INITBLOCK # define CONFIG_SPI_BAUD_INITBLOCK (BOOTROM_SUPPORTS_SPI_FAST_READ ? 2 : 4) #endif #ifdef SPI0_BAUD # define bfin_write_SPI_BAUD bfin_write_SPI0_BAUD #endif /* PLL_DIV defines */ #ifndef CONFIG_PLL_DIV_VAL # if (CONFIG_CCLK_DIV == 1) # define CONFIG_CCLK_ACT_DIV CCLK_DIV1 # elif (CONFIG_CCLK_DIV == 2) # define CONFIG_CCLK_ACT_DIV CCLK_DIV2 # elif (CONFIG_CCLK_DIV == 4) # define CONFIG_CCLK_ACT_DIV CCLK_DIV4 # elif (CONFIG_CCLK_DIV == 8) # define CONFIG_CCLK_ACT_DIV CCLK_DIV8 # else # define CONFIG_CCLK_ACT_DIV CONFIG_CCLK_DIV_not_defined_properly # endif # define CONFIG_PLL_DIV_VAL (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV) #endif #ifndef CONFIG_PLL_LOCKCNT_VAL # define CONFIG_PLL_LOCKCNT_VAL 0x0300 #endif #ifndef CONFIG_PLL_CTL_VAL # define CONFIG_PLL_CTL_VAL (SPORT_HYST | (CONFIG_VCO_MULT << 9) | CONFIG_CLKIN_HALF) #endif #ifndef CONFIG_EBIU_RSTCTL_VAL # define CONFIG_EBIU_RSTCTL_VAL 0 /* only MDDRENABLE is useful */ #endif #if ((CONFIG_EBIU_RSTCTL_VAL & 0xFFFFFFC4) != 0) # error invalid EBIU_RSTCTL value: must not set reserved bits #endif #ifndef CONFIG_EBIU_MBSCTL_VAL # define CONFIG_EBIU_MBSCTL_VAL 0 #endif #if defined(CONFIG_EBIU_DDRQUE_VAL) && ((CONFIG_EBIU_DDRQUE_VAL & 0xFFFF8000) != 0) # error invalid EBIU_DDRQUE value: must not set reserved bits #endif /* Make sure our voltage value is sane so we don't blow up! */ #ifndef CONFIG_VR_CTL_VAL # define BFIN_CCLK ((CONFIG_CLKIN_HZ * CONFIG_VCO_MULT) / CONFIG_CCLK_DIV) # if defined(__ADSPBF533__) || defined(__ADSPBF532__) || defined(__ADSPBF531__) # define CCLK_VLEV_120 400000000 # define CCLK_VLEV_125 533000000 # elif defined(__ADSPBF537__) || defined(__ADSPBF536__) || defined(__ADSPBF534__) # define CCLK_VLEV_120 401000000 # define CCLK_VLEV_125 401000000 # elif defined(__ADSPBF561__) # define CCLK_VLEV_120 300000000 # define CCLK_VLEV_125 501000000 # endif # if BFIN_CCLK < CCLK_VLEV_120 # define CONFIG_VR_CTL_VLEV VLEV_120 # elif BFIN_CCLK < CCLK_VLEV_125 # define CONFIG_VR_CTL_VLEV VLEV_125 # else # define CONFIG_VR_CTL_VLEV VLEV_130 # endif # if defined(__ADSPBF52x__) /* TBD; use default */ # undef CONFIG_VR_CTL_VLEV # define CONFIG_VR_CTL_VLEV VLEV_110 # elif defined(__ADSPBF54x__) /* TBD; use default */ # undef CONFIG_VR_CTL_VLEV # define CONFIG_VR_CTL_VLEV VLEV_120 # elif defined(__ADSPBF538__) || defined(__ADSPBF539__) /* TBD; use default */ # undef CONFIG_VR_CTL_VLEV # define CONFIG_VR_CTL_VLEV VLEV_125 # endif # ifdef CONFIG_BFIN_MAC # define CONFIG_VR_CTL_CLKBUF CLKBUFOE # else # define CONFIG_VR_CTL_CLKBUF 0 # endif # if defined(__ADSPBF52x__) # define CONFIG_VR_CTL_FREQ FREQ_1000 # else # define CONFIG_VR_CTL_FREQ (GAIN_20 | FREQ_1000) # endif # define CONFIG_VR_CTL_VAL (CONFIG_VR_CTL_CLKBUF | CONFIG_VR_CTL_VLEV | CONFIG_VR_CTL_FREQ) #endif /* some parts do not have an on-chip voltage regulator */ #if defined(__ADSPBF51x__) # define CONFIG_HAS_VR 0 # undef CONFIG_VR_CTL_VAL # define CONFIG_VR_CTL_VAL 0 #else # define CONFIG_HAS_VR 1 #endif #ifndef EBIU_RSTCTL /* Blackfin with SDRAM */ #ifndef CONFIG_EBIU_SDBCTL_VAL # if CONFIG_MEM_SIZE == 16 # define CONFIG_EBSZ_VAL EBSZ_16 # elif CONFIG_MEM_SIZE == 32 # define CONFIG_EBSZ_VAL EBSZ_32 # elif CONFIG_MEM_SIZE == 64 # define CONFIG_EBSZ_VAL EBSZ_64 # elif CONFIG_MEM_SIZE == 128 # define CONFIG_EBSZ_VAL EBSZ_128 # elif CONFIG_MEM_SIZE == 256 # define CONFIG_EBSZ_VAL EBSZ_256 # elif CONFIG_MEM_SIZE == 512 # define CONFIG_EBSZ_VAL EBSZ_512 # else # error You need to define CONFIG_EBIU_SDBCTL_VAL or CONFIG_MEM_SIZE # endif # if CONFIG_MEM_ADD_WDTH == 8 # define CONFIG_EBCAW_VAL EBCAW_8 # elif CONFIG_MEM_ADD_WDTH == 9 # define CONFIG_EBCAW_VAL EBCAW_9 # elif CONFIG_MEM_ADD_WDTH == 10 # define CONFIG_EBCAW_VAL EBCAW_10 # elif CONFIG_MEM_ADD_WDTH == 11 # define CONFIG_EBCAW_VAL EBCAW_11 # else # error You need to define CONFIG_EBIU_SDBCTL_VAL or CONFIG_MEM_ADD_WDTH # endif # define CONFIG_EBIU_SDBCTL_VAL (CONFIG_EBCAW_VAL | CONFIG_EBSZ_VAL | EBE) #endif #endif BOOTROM_CALLED_FUNC_ATTR void initcode(ADI_BOOT_DATA *bootstruct) { ADI_BOOT_DATA bootstruct_scratch; /* Save the clock pieces that are used in baud rate calculation */ unsigned int sdivB, divB, vcoB; serial_init(); if (BFIN_DEBUG_EARLY_SERIAL || CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_UART) { sdivB = bfin_read_PLL_DIV() & 0xf; vcoB = (bfin_read_PLL_CTL() >> 9) & 0x3f; divB = serial_early_get_div(); } serial_putc('A'); /* If the bootstruct is NULL, then it's because we're loading * dynamically and not via LDR (bootrom). So set the struct to * some scratch space. */ if (!bootstruct) bootstruct = &bootstruct_scratch; #ifdef CONFIG_HW_WATCHDOG # ifndef CONFIG_HW_WATCHDOG_TIMEOUT_INITCODE # define CONFIG_HW_WATCHDOG_TIMEOUT_INITCODE 20000 # endif /* Program the watchdog with an initial timeout of ~20 seconds. * Hopefully that should be long enough to load the u-boot LDR * (from wherever) and then the common u-boot code can take over. * In bypass mode, the start.S would have already set a much lower * timeout, so don't clobber that. */ if (CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_BYPASS) { bfin_write_WDOG_CNT(MSEC_TO_SCLK(CONFIG_HW_WATCHDOG_TIMEOUT_INITCODE)); bfin_write_WDOG_CTL(0); } #endif serial_putc('B'); /* If external memory is enabled, put it into self refresh first. */ bool put_into_srfs = false; #ifdef EBIU_RSTCTL if (bfin_read_EBIU_RSTCTL() & DDR_SRESET) { bfin_write_EBIU_RSTCTL(bfin_read_EBIU_RSTCTL() | SRREQ); put_into_srfs = true; } #else if (bfin_read_EBIU_SDBCTL() & EBE) { bfin_write_EBIU_SDGCTL(bfin_read_EBIU_SDGCTL() | SRFS); put_into_srfs = true; } #endif serial_putc('C'); /* Blackfin bootroms use the SPI slow read opcode instead of the SPI * fast read, so we need to slow down the SPI clock a lot more during * boot. Once we switch over to u-boot's SPI flash driver, we'll * increase the speed appropriately. */ if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_SPI_MASTER) { if (BOOTROM_SUPPORTS_SPI_FAST_READ && CONFIG_SPI_BAUD_INITBLOCK < 4) bootstruct->dFlags |= BFLAG_FASTREAD; bfin_write_SPI_BAUD(CONFIG_SPI_BAUD_INITBLOCK); } serial_putc('D'); /* If we're entering self refresh, make sure it has happened. */ if (put_into_srfs) #ifdef EBIU_RSTCTL while (!(bfin_read_EBIU_RSTCTL() & SRACK)) #else while (!(bfin_read_EBIU_SDSTAT() & SDSRA)) #endif continue; serial_putc('E'); /* With newer bootroms, we use the helper function to set up * the memory controller. Older bootroms lacks such helpers * so we do it ourselves. */ uint16_t vr_ctl = bfin_read_VR_CTL(); if (!ANOMALY_05000386) { serial_putc('F'); ADI_SYSCTRL_VALUES memory_settings; uint32_t actions = SYSCTRL_WRITE | SYSCTRL_PLLCTL | SYSCTRL_PLLDIV | SYSCTRL_LOCKCNT; if (CONFIG_HAS_VR) { actions |= SYSCTRL_VRCTL; if (CONFIG_VR_CTL_VAL & FREQ_MASK) actions |= SYSCTRL_INTVOLTAGE; else actions |= SYSCTRL_EXTVOLTAGE; memory_settings.uwVrCtl = CONFIG_VR_CTL_VAL; } else actions |= SYSCTRL_EXTVOLTAGE; memory_settings.uwPllCtl = CONFIG_PLL_CTL_VAL; memory_settings.uwPllDiv = CONFIG_PLL_DIV_VAL; memory_settings.uwPllLockCnt = CONFIG_PLL_LOCKCNT_VAL; #if ANOMALY_05000432 bfin_write_SIC_IWR1(0); #endif bfrom_SysControl(actions, &memory_settings, NULL); #if ANOMALY_05000432 bfin_write_SIC_IWR1(-1); #endif #if ANOMALY_05000171 bfin_write_SICA_IWR0(-1); bfin_write_SICA_IWR1(-1); #endif } else { serial_putc('G'); /* Disable all peripheral wakeups except for the PLL event. */ #ifdef SIC_IWR0 bfin_write_SIC_IWR0(1); bfin_write_SIC_IWR1(0); # ifdef SIC_IWR2 bfin_write_SIC_IWR2(0); # endif #elif defined(SICA_IWR0) bfin_write_SICA_IWR0(1); bfin_write_SICA_IWR1(0); #else bfin_write_SIC_IWR(1); #endif serial_putc('H'); bfin_write_PLL_LOCKCNT(CONFIG_PLL_LOCKCNT_VAL); serial_putc('I'); /* Only reprogram when needed to avoid triggering unnecessary * PLL relock sequences. */ if (vr_ctl != CONFIG_VR_CTL_VAL) { serial_putc('!'); bfin_write_VR_CTL(CONFIG_VR_CTL_VAL); asm("idle;"); } serial_putc('J'); bfin_write_PLL_DIV(CONFIG_PLL_DIV_VAL); serial_putc('K'); /* Only reprogram when needed to avoid triggering unnecessary * PLL relock sequences. */ if (ANOMALY_05000242 || bfin_read_PLL_CTL() != CONFIG_PLL_CTL_VAL) { serial_putc('!'); bfin_write_PLL_CTL(CONFIG_PLL_CTL_VAL); asm("idle;"); } serial_putc('L'); /* Restore all peripheral wakeups. */ #ifdef SIC_IWR0 bfin_write_SIC_IWR0(-1); bfin_write_SIC_IWR1(-1); # ifdef SIC_IWR2 bfin_write_SIC_IWR2(-1); # endif #elif defined(SICA_IWR0) bfin_write_SICA_IWR0(-1); bfin_write_SICA_IWR1(-1); #else bfin_write_SIC_IWR(-1); #endif } serial_putc('M'); /* Since we've changed the SCLK above, we may need to update * the UART divisors (UART baud rates are based on SCLK). * Do the division by hand as there are no native instructions * for dividing which means we'd generate a libgcc reference. */ if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_UART) { unsigned int sdivR, vcoR; sdivR = bfin_read_PLL_DIV() & 0xf; vcoR = (bfin_read_PLL_CTL() >> 9) & 0x3f; int dividend = sdivB * divB * vcoR; int divisor = vcoB * sdivR; unsigned int quotient; for (quotient = 0; dividend > 0; ++quotient) dividend -= divisor; serial_early_put_div(quotient - ANOMALY_05000230); } serial_putc('N'); /* Program the external memory controller before we come out of * self-refresh. This only works with our SDRAM controller. */ #ifndef EBIU_RSTCTL bfin_write_EBIU_SDRRC(CONFIG_EBIU_SDRRC_VAL); bfin_write_EBIU_SDBCTL(CONFIG_EBIU_SDBCTL_VAL); bfin_write_EBIU_SDGCTL(CONFIG_EBIU_SDGCTL_VAL); #endif serial_putc('O'); /* Now that we've reprogrammed, take things out of self refresh. */ if (put_into_srfs) #ifdef EBIU_RSTCTL bfin_write_EBIU_RSTCTL(bfin_read_EBIU_RSTCTL() & ~(SRREQ)); #else bfin_write_EBIU_SDGCTL(bfin_read_EBIU_SDGCTL() & ~(SRFS)); #endif serial_putc('P'); /* Our DDR controller sucks and cannot be programmed while in * self-refresh. So we have to pull it out before programming. */ #ifdef EBIU_RSTCTL bfin_write_EBIU_RSTCTL(bfin_read_EBIU_RSTCTL() | 0x1 /*DDRSRESET*/ | CONFIG_EBIU_RSTCTL_VAL); bfin_write_EBIU_DDRCTL0(CONFIG_EBIU_DDRCTL0_VAL); bfin_write_EBIU_DDRCTL1(CONFIG_EBIU_DDRCTL1_VAL); bfin_write_EBIU_DDRCTL2(CONFIG_EBIU_DDRCTL2_VAL); # ifdef CONFIG_EBIU_DDRCTL3_VAL /* default is disable, so don't need to force this */ bfin_write_EBIU_DDRCTL3(CONFIG_EBIU_DDRCTL3_VAL); # endif # ifdef CONFIG_EBIU_DDRQUE_VAL bfin_write_EBIU_DDRQUE(bfin_read_EBIU_DDRQUE() | CONFIG_EBIU_DDRQUE_VAL); # endif #endif serial_putc('Q'); /* Are we coming out of hibernate (suspend to memory) ? * The memory layout is: * 0x0: hibernate magic for anomaly 307 (0xDEADBEEF) * 0x4: return address * 0x8: stack pointer * * SCKELOW is unreliable on older parts (anomaly 307) */ if (ANOMALY_05000307 || vr_ctl & 0x8000) { uint32_t *hibernate_magic = 0; __builtin_bfin_ssync(); /* make sure memory controller is done */ if (hibernate_magic[0] == 0xDEADBEEF) { serial_putc('R'); bfin_write_EVT15(hibernate_magic[1]); bfin_write_IMASK(EVT_IVG15); __asm__ __volatile__ ( /* load reti early to avoid anomaly 281 */ "reti = %0;" /* clear hibernate magic */ "[%0] = %1;" /* load stack pointer */ "SP = [%0 + 8];" /* lower ourselves from reset ivg to ivg15 */ "raise 15;" "rti;" : : "p"(hibernate_magic), "d"(0x2000 /* jump.s 0 */) ); } } serial_putc('S'); /* Program the async banks controller. */ bfin_write_EBIU_AMBCTL0(CONFIG_EBIU_AMBCTL0_VAL); bfin_write_EBIU_AMBCTL1(CONFIG_EBIU_AMBCTL1_VAL); bfin_write_EBIU_AMGCTL(CONFIG_EBIU_AMGCTL_VAL); #ifdef EBIU_MODE /* Not all parts have these additional MMRs. */ bfin_write_EBIU_MBSCTL(CONFIG_EBIU_MBSCTL_VAL); bfin_write_EBIU_MODE(CONFIG_EBIU_MODE_VAL); bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTL_VAL); #endif serial_putc('T'); /* tell the bootrom where our entry point is */ if (CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_BYPASS) bfin_write_EVT1(CONFIG_SYS_MONITOR_BASE); serial_putc('>'); serial_putc('\n'); serial_deinit(); }