/* * 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 #define BFIN_IN_INITCODE #include "serial.h" __attribute__((always_inline)) static inline uint32_t 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 uint32_t old_baud = serial_early_get_baud(); if (BFIN_DEBUG_EARLY_SERIAL) { serial_early_init(); /* If the UART is off, that means we need to program * the baud rate ourselves initially. */ if (!old_baud) { old_baud = CONFIG_BAUDRATE; serial_early_set_baud(CONFIG_BAUDRATE); } } return old_baud; } __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 } /* We need to reset the baud rate when we have early debug turned on * or when we are booting over the UART. * XXX: we should fix this to calc the old baud and restore it rather * than hardcoding it via CONFIG_LDR_LOAD_BAUD ... but we have * to figure out how to avoid the division in the baud calc ... */ __attribute__((always_inline)) static inline void serial_reset_baud(uint32_t baud) { if (!BFIN_DEBUG_EARLY_SERIAL && CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_UART) return; #ifndef CONFIG_LDR_LOAD_BAUD # define CONFIG_LDR_LOAD_BAUD 115200 #endif if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS) serial_early_set_baud(baud); else if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_UART) serial_early_set_baud(CONFIG_LDR_LOAD_BAUD); else serial_early_set_baud(CONFIG_BAUDRATE); } __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 4 gives * us a freq of 33MHz for SPI which should generally be * slow enough for the slow reads the bootrom uses. */ #ifndef CONFIG_SPI_BAUD_INITBLOCK # define CONFIG_SPI_BAUD_INITBLOCK 4 #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)) #endif #ifndef CONFIG_EBIU_RSTCTL_VAL # define CONFIG_EBIU_RSTCTL_VAL 0 /* only MDDRENABLE is useful */ #endif #ifndef CONFIG_EBIU_MBSCTL_VAL # define CONFIG_EBIU_MBSCTL_VAL 0 #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 # 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 __attribute__((saveall)) void initcode(ADI_BOOT_DATA *bootstruct) { uint32_t old_baud = serial_init(); #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('S'); /* 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) #ifdef SPI0_BAUD bfin_write_SPI0_BAUD(CONFIG_SPI_BAUD_INITBLOCK); #else bfin_write_SPI_BAUD(CONFIG_SPI_BAUD_INITBLOCK); #endif serial_putc('B'); /* 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('L'); bfin_write_PLL_LOCKCNT(CONFIG_PLL_LOCKCNT_VAL); serial_putc('A'); /* Only reprogram when needed to avoid triggering unnecessary * PLL relock sequences. */ if (bfin_read_VR_CTL() != CONFIG_VR_CTL_VAL) { serial_putc('!'); bfin_write_VR_CTL(CONFIG_VR_CTL_VAL); asm("idle;"); } serial_putc('C'); bfin_write_PLL_DIV(CONFIG_PLL_DIV_VAL); serial_putc('K'); /* Only reprogram when needed to avoid triggering unnecessary * PLL relock sequences. */ if (bfin_read_PLL_CTL() != CONFIG_PLL_CTL_VAL) { serial_putc('!'); bfin_write_PLL_CTL(CONFIG_PLL_CTL_VAL); asm("idle;"); } /* Since we've changed the SCLK above, we may need to update * the UART divisors (UART baud rates are based on SCLK). */ serial_reset_baud(old_baud); serial_putc('F'); /* 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('I'); /* Program the external memory controller. */ #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 #else 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('N'); /* 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('>'); serial_putc('\n'); serial_deinit(); }