1*e2469d82SVarun Wadekar/* 2*e2469d82SVarun Wadekar * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved. 3*e2469d82SVarun Wadekar * Copyright (c) 2020, NVIDIA Corporation. All rights reserved. 4*e2469d82SVarun Wadekar * 5*e2469d82SVarun Wadekar * SPDX-License-Identifier: BSD-3-Clause 6*e2469d82SVarun Wadekar */ 7*e2469d82SVarun Wadekar#include <asm_macros.S> 8*e2469d82SVarun Wadekar#include <console_macros.S> 9*e2469d82SVarun Wadekar 10*e2469d82SVarun Wadekar#define CONSOLE_NUM_BYTES_SHIFT 24 11*e2469d82SVarun Wadekar#define CONSOLE_FLUSH_DATA_TO_PORT (1 << 26) 12*e2469d82SVarun Wadekar#define CONSOLE_RING_DOORBELL (1 << 31) 13*e2469d82SVarun Wadekar#define CONSOLE_IS_BUSY (1 << 31) 14*e2469d82SVarun Wadekar#define CONSOLE_TIMEOUT 0xC000 /* approx. 50 ms */ 15*e2469d82SVarun Wadekar#define CONSOLE_WRITE (CONSOLE_RING_DOORBELL | CONSOLE_FLUSH_DATA_TO_PORT) 16*e2469d82SVarun Wadekar 17*e2469d82SVarun Wadekar /* 18*e2469d82SVarun Wadekar * This file contains a driver implementation to make use of the 19*e2469d82SVarun Wadekar * real console implementation provided by the SPE firmware running 20*e2469d82SVarun Wadekar * SoCs after Tegra186. 21*e2469d82SVarun Wadekar * 22*e2469d82SVarun Wadekar * This console is shared by multiple components and the SPE firmware 23*e2469d82SVarun Wadekar * finally displays everything on the UART port. 24*e2469d82SVarun Wadekar */ 25*e2469d82SVarun Wadekar 26*e2469d82SVarun Wadekar .globl console_spe_core_init 27*e2469d82SVarun Wadekar .globl console_spe_core_putc 28*e2469d82SVarun Wadekar .globl console_spe_core_getc 29*e2469d82SVarun Wadekar .globl console_spe_core_flush 30*e2469d82SVarun Wadekar .globl console_spe_putc 31*e2469d82SVarun Wadekar .globl console_spe_getc 32*e2469d82SVarun Wadekar .globl console_spe_flush 33*e2469d82SVarun Wadekar .globl console_spe_register 34*e2469d82SVarun Wadekar 35*e2469d82SVarun Wadekar.macro check_if_console_is_ready base, tmp1, tmp2, label 36*e2469d82SVarun Wadekar /* wait until spe is ready or timeout expires */ 37*e2469d82SVarun Wadekar mrs \tmp2, cntps_tval_el1 38*e2469d82SVarun Wadekar1: ldr \tmp1, [\base] 39*e2469d82SVarun Wadekar and \tmp1, \tmp1, #CONSOLE_IS_BUSY 40*e2469d82SVarun Wadekar cbz \tmp1, 2f 41*e2469d82SVarun Wadekar mrs \tmp1, cntps_tval_el1 42*e2469d82SVarun Wadekar sub \tmp1, \tmp2, \tmp1 43*e2469d82SVarun Wadekar cmp \tmp1, #CONSOLE_TIMEOUT 44*e2469d82SVarun Wadekar b.lt 1b 45*e2469d82SVarun Wadekar b \label 46*e2469d82SVarun Wadekar2: 47*e2469d82SVarun Wadekar.endm 48*e2469d82SVarun Wadekar 49*e2469d82SVarun Wadekar /* ------------------------------------------------- 50*e2469d82SVarun Wadekar * int console_spe_register(uintptr_t baseaddr, 51*e2469d82SVarun Wadekar * uint32_t clock, uint32_t baud, 52*e2469d82SVarun Wadekar * console_t *console); 53*e2469d82SVarun Wadekar * Function to initialize and register a new spe 54*e2469d82SVarun Wadekar * console. Storage passed in for the console struct 55*e2469d82SVarun Wadekar * *must* be persistent (i.e. not from the stack). 56*e2469d82SVarun Wadekar * In: x0 - UART register base address 57*e2469d82SVarun Wadekar * w1 - UART clock in Hz 58*e2469d82SVarun Wadekar * w2 - Baud rate 59*e2469d82SVarun Wadekar * x3 - pointer to empty console_t struct 60*e2469d82SVarun Wadekar * Out: return 1 on success, 0 on error 61*e2469d82SVarun Wadekar * Clobber list : x0, x1, x2, x6, x7, x14 62*e2469d82SVarun Wadekar * ------------------------------------------------- 63*e2469d82SVarun Wadekar */ 64*e2469d82SVarun Wadekarfunc console_spe_register 65*e2469d82SVarun Wadekar /* Check the input base address */ 66*e2469d82SVarun Wadekar cbz x0, register_fail 67*e2469d82SVarun Wadekar 68*e2469d82SVarun Wadekar /* Dont use clock or baud rate, so ok to overwrite them */ 69*e2469d82SVarun Wadekar check_if_console_is_ready x0, x1, x2, register_fail 70*e2469d82SVarun Wadekar 71*e2469d82SVarun Wadekar cbz x3, register_fail 72*e2469d82SVarun Wadekar str x0, [x3, #CONSOLE_T_BASE] 73*e2469d82SVarun Wadekar mov x0, x3 74*e2469d82SVarun Wadekar finish_console_register spe putc=1, getc=1, flush=1 75*e2469d82SVarun Wadekar 76*e2469d82SVarun Wadekarregister_fail: 77*e2469d82SVarun Wadekar mov w0, wzr 78*e2469d82SVarun Wadekar ret 79*e2469d82SVarun Wadekarendfunc console_spe_register 80*e2469d82SVarun Wadekar 81*e2469d82SVarun Wadekar /* -------------------------------------------------------- 82*e2469d82SVarun Wadekar * int console_spe_core_putc(int c, uintptr_t base_addr) 83*e2469d82SVarun Wadekar * Function to output a character over the console. It 84*e2469d82SVarun Wadekar * returns the character printed on success or -1 on error. 85*e2469d82SVarun Wadekar * In : w0 - character to be printed 86*e2469d82SVarun Wadekar * x1 - console base address 87*e2469d82SVarun Wadekar * Out : return -1 on error else return character. 88*e2469d82SVarun Wadekar * Clobber list : x2, x3 89*e2469d82SVarun Wadekar * -------------------------------------------------------- 90*e2469d82SVarun Wadekar */ 91*e2469d82SVarun Wadekarfunc console_spe_core_putc 92*e2469d82SVarun Wadekar /* Check the input parameter */ 93*e2469d82SVarun Wadekar cbz x1, putc_error 94*e2469d82SVarun Wadekar 95*e2469d82SVarun Wadekar /* Prepend '\r' to '\n' */ 96*e2469d82SVarun Wadekar cmp w0, #0xA 97*e2469d82SVarun Wadekar b.ne not_eol 98*e2469d82SVarun Wadekar 99*e2469d82SVarun Wadekar check_if_console_is_ready x1, x2, x3, putc_error 100*e2469d82SVarun Wadekar 101*e2469d82SVarun Wadekar /* spe is ready */ 102*e2469d82SVarun Wadekar mov w2, #0xD /* '\r' */ 103*e2469d82SVarun Wadekar and w2, w2, #0xFF 104*e2469d82SVarun Wadekar mov w3, #(CONSOLE_WRITE | (1 << CONSOLE_NUM_BYTES_SHIFT)) 105*e2469d82SVarun Wadekar orr w2, w2, w3 106*e2469d82SVarun Wadekar str w2, [x1] 107*e2469d82SVarun Wadekar 108*e2469d82SVarun Wadekarnot_eol: 109*e2469d82SVarun Wadekar check_if_console_is_ready x1, x2, x3, putc_error 110*e2469d82SVarun Wadekar 111*e2469d82SVarun Wadekar /* spe is ready */ 112*e2469d82SVarun Wadekar mov w2, w0 113*e2469d82SVarun Wadekar and w2, w2, #0xFF 114*e2469d82SVarun Wadekar mov w3, #(CONSOLE_WRITE | (1 << CONSOLE_NUM_BYTES_SHIFT)) 115*e2469d82SVarun Wadekar orr w2, w2, w3 116*e2469d82SVarun Wadekar str w2, [x1] 117*e2469d82SVarun Wadekar 118*e2469d82SVarun Wadekar ret 119*e2469d82SVarun Wadekarputc_error: 120*e2469d82SVarun Wadekar mov w0, #-1 121*e2469d82SVarun Wadekar ret 122*e2469d82SVarun Wadekarendfunc console_spe_core_putc 123*e2469d82SVarun Wadekar 124*e2469d82SVarun Wadekar /* -------------------------------------------------------- 125*e2469d82SVarun Wadekar * int console_spe_putc(int c, console_t *console) 126*e2469d82SVarun Wadekar * Function to output a character over the console. It 127*e2469d82SVarun Wadekar * returns the character printed on success or -1 on error. 128*e2469d82SVarun Wadekar * In : w0 - character to be printed 129*e2469d82SVarun Wadekar * x1 - pointer to console_t structure 130*e2469d82SVarun Wadekar * Out : return -1 on error else return character. 131*e2469d82SVarun Wadekar * Clobber list : x2 132*e2469d82SVarun Wadekar * -------------------------------------------------------- 133*e2469d82SVarun Wadekar */ 134*e2469d82SVarun Wadekarfunc console_spe_putc 135*e2469d82SVarun Wadekar ldr x1, [x1, #CONSOLE_T_BASE] 136*e2469d82SVarun Wadekar b console_spe_core_putc 137*e2469d82SVarun Wadekarendfunc console_spe_putc 138*e2469d82SVarun Wadekar 139*e2469d82SVarun Wadekar /* --------------------------------------------- 140*e2469d82SVarun Wadekar * int console_spe_getc(console_t *console) 141*e2469d82SVarun Wadekar * Function to get a character from the console. 142*e2469d82SVarun Wadekar * It returns the character grabbed on success 143*e2469d82SVarun Wadekar * or -1 if no character is available. 144*e2469d82SVarun Wadekar * In : x0 - pointer to console_t structure 145*e2469d82SVarun Wadekar * Out: w0 - character if available, else -1 146*e2469d82SVarun Wadekar * Clobber list : x0, x1 147*e2469d82SVarun Wadekar * --------------------------------------------- 148*e2469d82SVarun Wadekar */ 149*e2469d82SVarun Wadekarfunc console_spe_getc 150*e2469d82SVarun Wadekar mov w0, #-1 151*e2469d82SVarun Wadekar ret 152*e2469d82SVarun Wadekarendfunc console_spe_getc 153*e2469d82SVarun Wadekar 154*e2469d82SVarun Wadekar /* ------------------------------------------------- 155*e2469d82SVarun Wadekar * int console_spe_core_flush(uintptr_t base_addr) 156*e2469d82SVarun Wadekar * Function to force a write of all buffered 157*e2469d82SVarun Wadekar * data that hasn't been output. 158*e2469d82SVarun Wadekar * In : x0 - console base address 159*e2469d82SVarun Wadekar * Out : return -1 on error else return 0. 160*e2469d82SVarun Wadekar * Clobber list : x0, x1 161*e2469d82SVarun Wadekar * ------------------------------------------------- 162*e2469d82SVarun Wadekar */ 163*e2469d82SVarun Wadekarfunc console_spe_core_flush 164*e2469d82SVarun Wadekar cbz x0, flush_error 165*e2469d82SVarun Wadekar 166*e2469d82SVarun Wadekar /* flush console */ 167*e2469d82SVarun Wadekar mov w1, #CONSOLE_WRITE 168*e2469d82SVarun Wadekar str w1, [x0] 169*e2469d82SVarun Wadekar mov w0, #0 170*e2469d82SVarun Wadekar ret 171*e2469d82SVarun Wadekarflush_error: 172*e2469d82SVarun Wadekar mov w0, #-1 173*e2469d82SVarun Wadekar ret 174*e2469d82SVarun Wadekarendfunc console_spe_core_flush 175*e2469d82SVarun Wadekar 176*e2469d82SVarun Wadekar /* --------------------------------------------- 177*e2469d82SVarun Wadekar * int console_spe_flush(console_t *console) 178*e2469d82SVarun Wadekar * Function to force a write of all buffered 179*e2469d82SVarun Wadekar * data that hasn't been output. 180*e2469d82SVarun Wadekar * In : x0 - pointer to console_t structure 181*e2469d82SVarun Wadekar * Out : return -1 on error else return 0. 182*e2469d82SVarun Wadekar * Clobber list : x0, x1 183*e2469d82SVarun Wadekar * --------------------------------------------- 184*e2469d82SVarun Wadekar */ 185*e2469d82SVarun Wadekarfunc console_spe_flush 186*e2469d82SVarun Wadekar ldr x0, [x0, #CONSOLE_T_BASE] 187*e2469d82SVarun Wadekar b console_spe_core_flush 188*e2469d82SVarun Wadekarendfunc console_spe_flush 189