188 lines
5.3 KiB
ArmAsm
188 lines
5.3 KiB
ArmAsm
/*
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* Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved.
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* Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <asm_macros.S>
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#include <assert_macros.S>
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#include <console_macros.S>
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#define CONSOLE_NUM_BYTES_SHIFT 24
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#define CONSOLE_FLUSH_DATA_TO_PORT (1 << 26)
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#define CONSOLE_RING_DOORBELL (1 << 31)
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#define CONSOLE_IS_BUSY (1 << 31)
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#define CONSOLE_TIMEOUT 0xC000 /* 50 ms */
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/*
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* This file contains a driver implementation to make use of the
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* real console implementation provided by the SPE firmware running
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* SoCs after Tegra186.
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*
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* This console is shared by multiple components and the SPE firmware
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* finally displays everything on the UART port.
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*/
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.globl console_spe_core_init
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.globl console_spe_core_putc
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.globl console_spe_core_getc
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.globl console_spe_core_flush
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.globl console_spe_putc
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.globl console_spe_getc
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.globl console_spe_flush
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.globl console_spe_register
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.macro check_if_console_is_ready base, tmp1, tmp2, label
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/* wait until spe is ready or timeout expires */
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mrs \tmp2, cntps_tval_el1
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1: ldr \tmp1, [\base]
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and \tmp1, \tmp1, #CONSOLE_IS_BUSY
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cbz \tmp1, 2f
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mrs \tmp1, cntps_tval_el1
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sub \tmp1, \tmp2, \tmp1
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cmp \tmp1, #CONSOLE_TIMEOUT
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b.lt 1b
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b \label
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2:
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.endm
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/* -------------------------------------------------
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* int console_spe_register(uintptr_t baseaddr,
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* uint32_t clock, uint32_t baud,
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* console_t *console);
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* Function to initialize and register a new spe
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* console. Storage passed in for the console struct
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* *must* be persistent (i.e. not from the stack).
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* In: x0 - UART register base address
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* w1 - UART clock in Hz
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* w2 - Baud rate
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* x3 - pointer to empty console_t struct
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* Out: return 1 on success, 0 on error
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* Clobber list : x0, x1, x2, x6, x7, x14
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* -------------------------------------------------
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*/
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func console_spe_register
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/* Check the input base address */
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cbz x0, register_fail
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/* Dont use clock or baud rate, so ok to overwrite them */
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check_if_console_is_ready x0, x1, x2, register_fail
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cbz x3, register_fail
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str x0, [x3, #CONSOLE_T_BASE]
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mov x0, x3
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finish_console_register spe putc=1, getc=1, flush=1
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register_fail:
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mov w0, wzr
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ret
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endfunc console_spe_register
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/* --------------------------------------------------------
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* int console_spe_core_putc(int c, uintptr_t base_addr)
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* Function to output a character over the console. It
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* returns the character printed on success or -1 on error.
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* In : w0 - character to be printed
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* x1 - console base address
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* Out : return -1 on error else return character.
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* Clobber list : x2, x3
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* --------------------------------------------------------
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*/
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func console_spe_core_putc
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/* Check the input parameter */
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cbz x1, putc_error
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/* Prepend '\r' to '\n' */
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cmp w0, #0xA
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b.ne not_eol
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check_if_console_is_ready x1, x2, x3, putc_error
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/* spe is ready */
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mov w2, #0xD /* '\r' */
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and w2, w2, #0xFF
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mov w3, #(CONSOLE_RING_DOORBELL | (1 << CONSOLE_NUM_BYTES_SHIFT))
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orr w2, w2, w3
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str w2, [x1]
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not_eol:
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check_if_console_is_ready x1, x2, x3, putc_error
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/* spe is ready */
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mov w2, w0
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and w2, w2, #0xFF
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mov w3, #(CONSOLE_RING_DOORBELL | (1 << CONSOLE_NUM_BYTES_SHIFT))
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orr w2, w2, w3
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str w2, [x1]
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ret
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putc_error:
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mov w0, #-1
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ret
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endfunc console_spe_core_putc
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/* --------------------------------------------------------
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* int console_spe_putc(int c, console_t *console)
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* Function to output a character over the console. It
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* returns the character printed on success or -1 on error.
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* In : w0 - character to be printed
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* x1 - pointer to console_t structure
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* Out : return -1 on error else return character.
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* Clobber list : x2
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* --------------------------------------------------------
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*/
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func console_spe_putc
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ldr x1, [x1, #CONSOLE_T_BASE]
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b console_spe_core_putc
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endfunc console_spe_putc
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/* ---------------------------------------------
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* int console_spe_getc(console_t *console)
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* Function to get a character from the console.
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* It returns the character grabbed on success
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* or -1 if no character is available.
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* In : x0 - pointer to console_t structure
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* Out: w0 - character if available, else -1
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* Clobber list : x0, x1
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* ---------------------------------------------
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*/
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func console_spe_getc
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mov w0, #-1
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ret
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endfunc console_spe_getc
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/* -------------------------------------------------
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* void console_spe_core_flush(uintptr_t base_addr)
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* Function to force a write of all buffered
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* data that hasn't been output.
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* In : x0 - console base address
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* Out : void.
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* Clobber list : x0, x1
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* -------------------------------------------------
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*/
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func console_spe_core_flush
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#if ENABLE_ASSERTIONS
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cmp x0, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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/* flush console */
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mov w1, #(CONSOLE_RING_DOORBELL | CONSOLE_FLUSH_DATA_TO_PORT)
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str w1, [x0]
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ret
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endfunc console_spe_core_flush
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/* ---------------------------------------------
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* void console_spe_flush(console_t *console)
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* Function to force a write of all buffered
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* data that hasn't been output.
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* In : x0 - pointer to console_t structure
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* Out : void.
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* Clobber list : x0, x1
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* ---------------------------------------------
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*/
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func console_spe_flush
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ldr x0, [x0, #CONSOLE_T_BASE]
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b console_spe_core_flush
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endfunc console_spe_flush
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