// // Authors: Wolfgang Spraul // // 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 // 3 of the License, or (at your option) any later version. // #include #include "../target-common/jz4740.h" #include "../target-common/serial.h" #define STAGE1_ARGS_ADDR 0x80002008 struct stage1_args { // PLL unsigned char ext_clk; // external crystal in MHz unsigned char cpu_speed; // PLL output frequency=cpu_speed * ext_clk Mhz unsigned char phm_div; // frequency divider ratio of PLL=CCLK:PCLK=HCLK=MCLK // UART unsigned char uart_num; // which UART to use (default: 0) unsigned int uart_baud; // default: 57600 // SDRAM unsigned char bus_width_16; // bus width of SDRAM is 16-bit (default is 32-bit) unsigned char bank_addr_2bit; // 2-bit bank address width (=4 banks each chip select), default is 1-bit bank address=2 banks unsigned char row_addr; // row address width in bits (11-13) unsigned char col_addr; // column address width in bits (8-12) } __attribute__((packed)); void load_args(); void gpio_init(); void pll_init(); void serial_init(); void sdram_init(); void c_main(void) { load_args(); gpio_init(); pll_init(); serial_init(); serial_puts("XBurst boot stage1...\n"); sdram_init(); serial_puts("stage 1 finished: GPIO, clocks, SDRAM, UART setup - now jump back to BOOT ROM...\n"); } // tbd: do they have to be copied into globals? or just reference STAGE1_ARGS_ADDR? volatile u32 ARG_EXTAL; volatile u32 ARG_CPU_SPEED; volatile u8 ARG_PHM_DIV; volatile u32 ARG_UART_BASE; volatile u32 ARG_UART_BAUD; volatile u8 ARG_BUS_WIDTH_16; volatile u8 ARG_BANK_ADDR_2BIT; volatile u8 ARG_ROW_ADDR; volatile u8 ARG_COL_ADDR; void load_args() { struct stage1_args* args = (struct stage1_args*) STAGE1_ARGS_ADDR; // NanoNote defaults args->ext_clk = 12; args->cpu_speed = 21; args->phm_div = 3; args->uart_num = 0; args->uart_baud = 57600; args->bus_width_16 = 1; args->bank_addr_2bit = 1; args->row_addr = 13; args->col_addr = 9; // END NanoNote defaults ARG_EXTAL = args->ext_clk * 1000000; ARG_CPU_SPEED = args->cpu_speed * ARG_EXTAL; ARG_PHM_DIV = args->phm_div; ARG_UART_BASE = UART0_BASE + args->uart_num * UART_OFF; UART_BASE = ARG_UART_BASE; // for ../target-common/serial.c ARG_UART_BAUD = args->uart_baud; ARG_BUS_WIDTH_16 = args->bus_width_16; ARG_BANK_ADDR_2BIT = args->bank_addr_2bit; ARG_ROW_ADDR = args->row_addr; ARG_COL_ADDR = args->col_addr; } void gpio_init() { __gpio_as_nand(); __gpio_as_sdram_32bit(); __gpio_as_uart0(); __gpio_as_uart1(); } void pll_init() { register unsigned int cfcr, plcr1; int n2FR[33] = { 0, 0, 1, 2, 3, 0, 4, 0, 5, 0, 0, 0, 6, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 9 }; /* int div[5] = {1, 4, 4, 4, 4}; */ /* divisors of I:S:P:L:M */ int nf, pllout2; cfcr = CPM_CPCCR_CLKOEN | (n2FR[1] << CPM_CPCCR_CDIV_BIT) | (n2FR[ARG_PHM_DIV] << CPM_CPCCR_HDIV_BIT) | (n2FR[ARG_PHM_DIV] << CPM_CPCCR_PDIV_BIT) | (n2FR[ARG_PHM_DIV] << CPM_CPCCR_MDIV_BIT) | (n2FR[ARG_PHM_DIV] << CPM_CPCCR_LDIV_BIT); pllout2 = (cfcr & CPM_CPCCR_PCS) ? ARG_CPU_SPEED : (ARG_CPU_SPEED / 2); /* Init UHC clock */ REG_CPM_UHCCDR = pllout2 / 48000000 - 1; nf = ARG_CPU_SPEED * 2 / ARG_EXTAL; 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 */ (0x20 << CPM_CPPCR_PLLST_BIT) | /* PLL stable time */ CPM_CPPCR_PLLEN; /* enable PLL */ /* init PLL */ REG_CPM_CPCCR = cfcr; REG_CPM_CPPCR = plcr1; } static void serial_setbaud() { volatile u8* uart_lcr = (volatile u8*)(ARG_UART_BASE + OFF_LCR); volatile u8* uart_dlhr = (volatile u8*)(ARG_UART_BASE + OFF_DLHR); volatile u8* uart_dllr = (volatile u8*)(ARG_UART_BASE + OFF_DLLR); u32 baud_div, tmp; baud_div = ARG_EXTAL / 16 / ARG_UART_BAUD; tmp = *uart_lcr; tmp |= UART_LCR_DLAB; *uart_lcr = tmp; *uart_dlhr = (baud_div >> 8) & 0xff; *uart_dllr = baud_div & 0xff; tmp &= ~UART_LCR_DLAB; *uart_lcr = tmp; } void serial_init() { volatile u8* uart_fcr = (volatile u8*)(ARG_UART_BASE + OFF_FCR); volatile u8* uart_lcr = (volatile u8*)(ARG_UART_BASE + OFF_LCR); volatile u8* uart_ier = (volatile u8*)(ARG_UART_BASE + OFF_IER); volatile u8* uart_sircr = (volatile u8*)(ARG_UART_BASE + OFF_SIRCR); /* Disable port interrupts while changing hardware */ *uart_ier = 0; /* Disable UART unit function */ *uart_fcr = ~UART_FCR_UUE; /* Set both receiver and transmitter in UART mode (not SIR) */ *uart_sircr = ~(SIRCR_RSIRE | SIRCR_TSIRE); /* Set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */ *uart_lcr = UART_LCR_WLEN_8 | UART_LCR_STOP_1; /* Set baud rate */ serial_setbaud(); /* Enable UART unit, enable and clear FIFO */ *uart_fcr = UART_FCR_UUE | UART_FCR_FE | UART_FCR_TFLS | UART_FCR_RFLS; } #define SDRAM_CASL 3 /* CAS latency: 2 or 3 */ // SDRAM Timings, unit: ns #define SDRAM_TRAS 45 /* RAS# Active Time */ #define SDRAM_RCD 20 /* RAS# to CAS# Delay */ #define SDRAM_TPC 20 /* RAS# Precharge Time */ #define SDRAM_TRWL 7 /* Write Latency Time */ #define SDRAM_TREF 15625 /* Refresh period: 4096 refresh cycles/64ms */ void sdram_init() { register unsigned int dmcr0, dmcr, sdmode, tmp, cpu_clk, mem_clk, ns; unsigned int cas_latency_sdmr[2] = { EMC_SDMR_CAS_2, EMC_SDMR_CAS_3, }; unsigned int cas_latency_dmcr[2] = { 1 << EMC_DMCR_TCL_BIT, /* CAS latency is 2 */ 2 << EMC_DMCR_TCL_BIT /* CAS latency is 3 */ }; int div[] = {1, 2, 3, 4, 6, 8, 12, 16, 24, 32}; cpu_clk = ARG_CPU_SPEED; mem_clk = cpu_clk * div[__cpm_get_cdiv()] / div[__cpm_get_mdiv()]; REG_EMC_BCR = 0; /* Disable bus release */ REG_EMC_RTCSR = 0; /* Disable clock for counting */ /* Fault DMCR value for mode register setting*/ dmcr0 = (ARG_BUS_WIDTH_16< 11) tmp = 11; dmcr |= ((tmp-4) << EMC_DMCR_TRAS_BIT); tmp = SDRAM_RCD/ns; if (tmp > 3) tmp = 3; dmcr |= (tmp << EMC_DMCR_RCD_BIT); tmp = SDRAM_TPC/ns; if (tmp > 7) tmp = 7; dmcr |= (tmp << EMC_DMCR_TPC_BIT); tmp = SDRAM_TRWL/ns; if (tmp > 3) tmp = 3; dmcr |= (tmp << EMC_DMCR_TRWL_BIT); tmp = (SDRAM_TRAS + SDRAM_TPC)/ns; if (tmp > 14) tmp = 14; dmcr |= (((tmp + 1) >> 1) << EMC_DMCR_TRC_BIT); /* SDRAM mode value */ sdmode = EMC_SDMR_BT_SEQ | EMC_SDMR_OM_NORMAL | EMC_SDMR_BL_4 | cas_latency_sdmr[((SDRAM_CASL == 3) ? 1 : 0)]; /* Stage 1. Precharge all banks by writing SDMR with DMCR.MRSET=0 */ REG_EMC_DMCR = dmcr; REG8(EMC_SDMR0|sdmode) = 0; /* Wait for precharge, > 200us */ tmp = (cpu_clk / 1000000) * 1000; while (tmp--); /* Stage 2. Enable auto-refresh */ REG_EMC_DMCR = dmcr | EMC_DMCR_RFSH; tmp = SDRAM_TREF/ns; tmp = tmp/64 + 1; if (tmp > 0xff) tmp = 0xff; REG_EMC_RTCOR = tmp; REG_EMC_RTCNT = 0; REG_EMC_RTCSR = EMC_RTCSR_CKS_64; /* Divisor is 64, CKO/64 */ /* Wait for number of auto-refresh cycles */ tmp = (cpu_clk / 1000000) * 1000; while (tmp--); /* Stage 3. Mode Register Set */ REG_EMC_DMCR = dmcr0 | EMC_DMCR_RFSH | EMC_DMCR_MRSET; REG8(EMC_SDMR0|sdmode) = 0; /* Set back to basic DMCR value */ REG_EMC_DMCR = dmcr | EMC_DMCR_RFSH | EMC_DMCR_MRSET; /* everything is ok now */ }