/* * Copyright (c) 2015-2018, Renesas Electronics Corporation. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #include #include #define SCIF_INTERNAL_CLK 0 #define SCIF_EXTARNAL_CLK 1 #define SCIF_CLK SCIF_INTERNAL_CLK /* product register */ #define PRR (0xFFF00044) #define PRR_PRODUCT_MASK (0x00007F00) #define PRR_CUT_MASK (0x000000FF) #define PRR_PRODUCT_H3_VER_10 (0x00004F00) #define PRR_PRODUCT_E3 (0x00005700) /* module stop */ #define CPG_BASE (0xE6150000) #define CPG_SMSTPCR3 (0x013C) #define CPG_MSTPSR3 (0x0048) #define MSTP310 (1 << 10) #define CPG_CPGWPR (0x0900) /* scif */ #define SCIF2_BASE (0xE6E88000) #define SCIF_SCSMR (0x00) #define SCIF_SCBRR (0x04) #define SCIF_SCSCR (0x08) #define SCIF_SCFTDR (0x0C) #define SCIF_SCFSR (0x10) #define SCIF_SCFRDR (0x14) #define SCIF_SCFCR (0x18) #define SCIF_SCFDR (0x1C) #define SCIF_SCSPTR (0x20) #define SCIF_SCLSR (0x24) #define SCIF_DL (0x30) #define SCIF_CKS (0x34) /* mode pin */ #define RST_MODEMR (0xE6160060) #define MODEMR_MD12 (0x00001000) #define SCSMR_CA_MASK (1 << 7) #define SCSMR_CA_ASYNC (0x0000) #define SCSMR_CHR_MASK (1 << 6) #define SCSMR_CHR_8 (0x0000) #define SCSMR_PE_MASK (1 << 5) #define SCSMR_PE_DIS (0x0000) #define SCSMR_STOP_MASK (1 << 3) #define SCSMR_STOP_1 (0x0000) #define SCSMR_CKS_MASK (3 << 0) #define SCSMR_CKS_DIV1 (0x0000) #define SCSMR_INIT_DATA (SCSMR_CA_ASYNC + \ SCSMR_CHR_8 + \ SCSMR_PE_DIS + \ SCSMR_STOP_1 + \ SCSMR_CKS_DIV1) #define SCBRR_115200BPS (17) #define SCBRR_115200BPS_E3_SSCG (15) #define SCBRR_230400BPS (8) #define SCSCR_TE_MASK (1 << 5) #define SCSCR_TE_DIS (0x0000) #define SCSCR_TE_EN (0x0020) #define SCSCR_RE_MASK (1 << 4) #define SCSCR_RE_DIS (0x0000) #define SCSCR_RE_EN (0x0010) #define SCSCR_CKE_MASK (3 << 0) #define SCSCR_CKE_INT (0x0000) #define SCSCR_CKE_BRG (0x0002) #if SCIF_CLK == SCIF_EXTARNAL_CLK #define SCSCR_CKE_INT_CLK (SCSCR_CKE_BRG) #else #define SCFSR_TEND_MASK (1 << 6) #define SCFSR_TEND_TRANS_END (0x0040) #define SCSCR_CKE_INT_CLK (SCSCR_CKE_INT) #endif #define SCFSR_INIT_DATA (0x0000) #define SCFCR_TTRG_MASK (3 << 4) #define SCFCR_TTRG_8 (0x0000) #define SCFCR_TTRG_0 (0x0030) #define SCFCR_TFRST_MASK (1 << 2) #define SCFCR_TFRST_DIS (0x0000) #define SCFCR_TFRST_EN (0x0004) #define SCFCR_RFRS_MASK (1 << 1) #define SCFCR_RFRS_DIS (0x0000) #define SCFCR_RFRS_EN (0x0002) #define SCFCR_INIT_DATA (SCFCR_TTRG_8) #define SCFDR_T_MASK (0x1f << 8) #define DL_INIT_DATA (8) #define CKS_CKS_DIV_MASK (1 << 15) #define CKS_CKS_DIV_CLK (0x0000) #define CKS_XIN_MASK (1 << 14) #define CKS_XIN_SCIF_CLK (0x0000) #define CKS_INIT_DATA (CKS_CKS_DIV_CLK + CKS_XIN_SCIF_CLK) .globl console_init .globl console_uninit .globl console_putc .globl console_core_init .globl console_core_putc .globl console_getc .globl console_flush /* * The console base is in the data section and not in .bss * even though it is zero-init. In particular, this allows * the console functions to start using this variable before * the runtime memory is initialized for images which do not * need to copy the .data section from ROM to RAM. */ /* ----------------------------------------------- * int console_init(unsigned long base_addr, * unsigned int uart_clk, unsigned int baud_rate) * Function to initialize the console without a * C Runtime to print debug information. It saves * the console base to the data section. * In: x0 - console base address * w1 - Uart clock in Hz * w2 - Baud rate * out: return 1 on success. * Clobber list : x1 - x3 * ----------------------------------------------- */ func console_init b console_core_init endfunc console_init func console_uninit ret endfunc console_uninit /* ----------------------------------------------- * int console_core_init(unsigned long base_addr, * unsigned int uart_clk, unsigned int baud_rate) * Function to initialize the console without a * C Runtime to print debug information. This * function will be accessed by console_init and * crash reporting. * In: x0 - console base address * w1 - Uart clock in Hz * w2 - Baud rate * Out: return 1 on success * Clobber list : x1, x2 * ----------------------------------------------- */ func console_core_init ldr x0, =CPG_BASE ldr w1, [x0, #CPG_SMSTPCR3] and w1, w1, #~MSTP310 /* MSTP310=0 */ mvn w2, w1 str w2, [x0, #CPG_CPGWPR] str w1, [x0, #CPG_SMSTPCR3] 5: ldr w1, [x0, #CPG_MSTPSR3] and w1, w1, #MSTP310 cbnz w1, 5b ldr x0, =SCIF2_BASE /* Clear bits TE and RE in SCSCR to 0 */ mov w1, #(SCSCR_TE_DIS + SCSCR_RE_DIS) strh w1, [x0, #SCIF_SCSCR] /* Set bits TFRST and RFRST in SCFCR to 1 */ ldrh w1, [x0, #SCIF_SCFCR] orr w1, w1, #(SCFCR_TFRST_EN + SCFCR_RFRS_EN) strh w1, [x0, #SCIF_SCFCR] /* Read flags of ER, DR, BRK, and RDF in SCFSR and those of TO and ORER in SCLSR, then clear them to 0 */ mov w1, #SCFSR_INIT_DATA strh w1, [x0, #SCIF_SCFSR] mov w1, #0 strh w1, [x0, #SCIF_SCLSR] /* Set bits CKE[1:0] in SCSCR */ ldrh w1, [x0, #SCIF_SCSCR] and w1, w1, #~SCSCR_CKE_MASK mov w2, #SCSCR_CKE_INT_CLK orr w1, w1, w2 strh w1, [x0, #SCIF_SCSCR] /* Set data transfer format in SCSMR */ mov w1, #SCSMR_INIT_DATA strh w1, [x0, #SCIF_SCSMR] /* Set value in SCBRR */ #if SCIF_CLK == SCIF_INTERNAL_CLK ldr x1, =PRR ldr w1, [x1] and w1, w1, #(PRR_PRODUCT_MASK | PRR_CUT_MASK) mov w2, #PRR_PRODUCT_H3_VER_10 cmp w1, w2 beq 3f and w1, w1, #PRR_PRODUCT_MASK mov w2, #PRR_PRODUCT_E3 cmp w1, w2 bne 4f ldr x1, =RST_MODEMR ldr w1, [x1] and w1, w1, #MODEMR_MD12 mov w2, #MODEMR_MD12 cmp w1, w2 bne 4f mov w1, #SCBRR_115200BPS_E3_SSCG b 2f 4: mov w1, #SCBRR_115200BPS b 2f 3: mov w1, #SCBRR_230400BPS 2: strb w1, [x0, SCIF_SCBRR] #else mov w1, #DL_INIT_DATA strh w1, [x0, #SCIF_DL] mov w1, #CKS_INIT_DATA strh w1, [x0, #SCIF_CKS] #endif /* 1-bit interval elapsed */ mov w1, #100 1: subs w1, w1, #1 cbnz w1, 1b /* * Set bits RTRG[1:0], TTRG[1:0], and MCE in SCFCR * Clear bits FRST and RFRST to 0 */ mov w1, #SCFCR_INIT_DATA strh w1, [x0, #SCIF_SCFCR] /* Set bits TE and RE in SCSCR to 1 */ ldrh w1, [x0, #SCIF_SCSCR] orr w1, w1, #(SCSCR_TE_EN + SCSCR_RE_EN) strh w1, [x0, #SCIF_SCSCR] mov x0, #1 ret endfunc console_core_init /* --------------------------------------------- * int console_putc(int c) * Function to output a character over the * console. It returns the character printed on * success or -1 on error. * In : x0 - character to be printed * Out : return -1 on error else return character. * Clobber list : x1, x2 * --------------------------------------------- */ func console_putc b console_core_putc endfunc console_putc /* -------------------------------------------------------- * int console_core_putc(int c, unsigned int base_addr) * Function to output a character over the console. It * returns the character printed on success or -1 on error. * In : w0 - character to be printed * x1 - console base address * Out : return -1 on error else return character. * Clobber list : x2 * -------------------------------------------------------- */ func console_core_putc ldr x1, =SCIF2_BASE cmp w0, #0xA /* Prepend '\r' to '\n' */ bne 2f 1: /* Check if the transmit FIFO is full */ ldrh w2, [x1, #SCIF_SCFDR] ubfx w2, w2, #8, #5 cmp w2, #16 bcs 1b mov w2, #0x0D strb w2, [x1, #SCIF_SCFTDR] 2: /* Check if the transmit FIFO is full */ ldrh w2, [x1, #SCIF_SCFDR] ubfx w2, w2, #8, #5 cmp w2, #16 bcs 2b strb w0, [x1, #SCIF_SCFTDR] /* Clear TEND flag */ ldrh w2, [x1, #SCIF_SCFSR] and w2, w2, #~SCFSR_TEND_MASK strh w2, [x1, #SCIF_SCFSR] ret endfunc console_core_putc /* --------------------------------------------- * int console_getc(void) * Function to get a character from the console. * It returns the character grabbed on success * or -1 on error. * Clobber list : x0, x1 * --------------------------------------------- */ func console_getc mov w0, #-1 ret endfunc console_getc /* --------------------------------------------- * int console_flush(void) * Function to force a write of all buffered * data that hasn't been output. It returns 0 * upon successful completion, otherwise it * returns -1. * Clobber list : x0, x1 * --------------------------------------------- */ func console_flush ldr x0, =SCIF2_BASE 1: /* Check TEND flag */ ldrh w1, [x0, #SCIF_SCFSR] and w1, w1, #SCFSR_TEND_MASK cmp w1, #SCFSR_TEND_TRANS_END bne 1b ldr x0, =SCIF2_BASE ldrh w1, [x0, #SCIF_SCSCR] and w1, w1, #~(SCSCR_TE_EN + SCSCR_RE_EN) strh w1, [x0, #SCIF_SCSCR] mov w0, #0 ret endfunc console_flush