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831b0e9824
And from crash_console_flush. We ignore the error information return by console_flush in _every_ place where we call it, and casting the return type to void does not work around the MISRA violation that this causes. Instead, we collect the error information from the driver (to avoid changing that API), and don't return it to the caller. Change-Id: I1e35afe01764d5c8f0efd04f8949d333ffb688c1 Signed-off-by: Jimmy Brisson <jimmy.brisson@arm.com>
262 lines
7.7 KiB
ArmAsm
262 lines
7.7 KiB
ArmAsm
/*
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* Copyright (c) 2018-2020, ARM Limited and Contributors. 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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#include <drivers/amlogic/meson_console.h>
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.globl console_meson_register
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.globl console_meson_init
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.globl console_meson_putc
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.globl console_meson_getc
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.globl console_meson_flush
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.globl console_meson_core_putc
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.globl console_meson_core_getc
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.globl console_meson_core_flush
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/* -----------------------------------------------
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* Hardware definitions
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* -----------------------------------------------
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*/
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#define MESON_WFIFO_OFFSET 0x0
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#define MESON_RFIFO_OFFSET 0x4
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#define MESON_CONTROL_OFFSET 0x8
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#define MESON_STATUS_OFFSET 0xC
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#define MESON_MISC_OFFSET 0x10
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#define MESON_REG5_OFFSET 0x14
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#define MESON_CONTROL_CLR_ERROR_BIT 24
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#define MESON_CONTROL_RX_RESET_BIT 23
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#define MESON_CONTROL_TX_RESET_BIT 22
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#define MESON_CONTROL_RX_ENABLE_BIT 13
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#define MESON_CONTROL_TX_ENABLE_BIT 12
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#define MESON_STATUS_RX_EMPTY_BIT 20
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#define MESON_STATUS_TX_FULL_BIT 21
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#define MESON_STATUS_TX_EMPTY_BIT 22
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#define MESON_REG5_USE_XTAL_CLK_BIT 24
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#define MESON_REG5_USE_NEW_RATE_BIT 23
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#define MESON_REG5_NEW_BAUD_RATE_MASK 0x7FFFFF
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/* -----------------------------------------------
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* int console_meson_register(uintptr_t base,
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* uint32_t clk, uint32_t baud,
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* console_t *console);
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* Function to initialize and register a new MESON
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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_meson_register
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mov x7, x30
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mov x6, x3
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cbz x6, register_fail
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str x0, [x6, #CONSOLE_T_BASE]
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bl console_meson_init
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cbz x0, register_fail
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mov x0, x6
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mov x30, x7
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finish_console_register meson putc=1, getc=1, flush=1
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register_fail:
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ret x7
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endfunc console_meson_register
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/* -----------------------------------------------
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* int console_meson_init(uintptr_t base_addr,
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* unsigned int uart_clk, unsigned int baud_rate)
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* Function to initialize the console without a
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* C Runtime to print debug information. This
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* function will be accessed by console_init and
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* crash reporting.
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* In: x0 - console base address
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* w1 - Uart clock in Hz
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* w2 - Baud rate
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* Out: return 1 on success else 0 on error
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* Clobber list : x0-x3
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* -----------------------------------------------
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*/
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func console_meson_init
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cmp w0, #0
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beq init_fail
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mov_imm w3, 24000000 /* TODO: This only works with a 24 MHz clock. */
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cmp w1, w3
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bne init_fail
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cmp w2, #0
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beq init_fail
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/* Set baud rate: value = ((clock / 3) / baudrate) - 1 */
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mov w3, #3
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udiv w3, w1, w3
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udiv w3, w3, w2
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sub w3, w3, #1
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orr w3, w3, #((1 << MESON_REG5_USE_XTAL_CLK_BIT) | \
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(1 << MESON_REG5_USE_NEW_RATE_BIT))
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str w3, [x0, #MESON_REG5_OFFSET]
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/* Reset UART and clear error flag */
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ldr w3, [x0, #MESON_CONTROL_OFFSET]
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orr w3, w3, #((1 << MESON_CONTROL_CLR_ERROR_BIT) | \
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(1 << MESON_CONTROL_RX_RESET_BIT) | \
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(1 << MESON_CONTROL_TX_RESET_BIT))
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str w3, [x0, #MESON_CONTROL_OFFSET]
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bic w3, w3, #((1 << MESON_CONTROL_CLR_ERROR_BIT) | \
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(1 << MESON_CONTROL_RX_RESET_BIT) | \
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(1 << MESON_CONTROL_TX_RESET_BIT))
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str w3, [x0, #MESON_CONTROL_OFFSET]
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/* Enable transfer and receive FIFO */
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orr w3, w3, #((1 << MESON_CONTROL_RX_ENABLE_BIT) | \
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(1 << MESON_CONTROL_TX_ENABLE_BIT))
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str w3, [x0, #MESON_CONTROL_OFFSET]
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/* Success */
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mov w0, #1
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ret
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init_fail:
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mov w0, wzr
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ret
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endfunc console_meson_init
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/* --------------------------------------------------------
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* int console_meson_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_meson_putc
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#if ENABLE_ASSERTIONS
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cmp x1, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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ldr x1, [x1, #CONSOLE_T_BASE]
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b console_meson_core_putc
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endfunc console_meson_putc
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/* --------------------------------------------------------
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* int console_meson_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
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* --------------------------------------------------------
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*/
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func console_meson_core_putc
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#if ENABLE_ASSERTIONS
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cmp x1, #0
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ASM_ASSERT(ne)
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#endif
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/* Prepend '\r' to '\n' */
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cmp w0, #0xA
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b.ne 2f
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/* Wait until the transmit FIFO isn't full */
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1: ldr w2, [x1, #MESON_STATUS_OFFSET]
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tbnz w2, #MESON_STATUS_TX_FULL_BIT, 1b
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/* Write '\r' if needed */
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mov w2, #0xD
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str w2, [x1, #MESON_WFIFO_OFFSET]
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/* Wait until the transmit FIFO isn't full */
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2: ldr w2, [x1, #MESON_STATUS_OFFSET]
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tbnz w2, #MESON_STATUS_TX_FULL_BIT, 2b
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/* Write input character */
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str w0, [x1, #MESON_WFIFO_OFFSET]
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ret
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endfunc console_meson_core_putc
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/* ---------------------------------------------
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* int console_meson_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_meson_getc
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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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ldr x0, [x0, #CONSOLE_T_BASE]
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b console_meson_core_getc
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endfunc console_meson_getc
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/* ---------------------------------------------
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* int console_meson_core_getc(uintptr_t base_addr)
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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 - console base address
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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_meson_core_getc
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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
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/* Is the receive FIFO empty? */
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ldr w1, [x0, #MESON_STATUS_OFFSET]
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tbnz w1, #MESON_STATUS_RX_EMPTY_BIT, 1f
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/* Read one character from the RX FIFO */
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ldr w0, [x0, #MESON_RFIFO_OFFSET]
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ret
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1:
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mov w0, #ERROR_NO_PENDING_CHAR
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ret
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endfunc console_meson_core_getc
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/* ---------------------------------------------
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* void console_meson_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_meson_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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ldr x0, [x0, #CONSOLE_T_BASE]
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b console_meson_core_flush
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endfunc console_meson_flush
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/* ---------------------------------------------
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* void console_meson_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_meson_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
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/* Wait until the transmit FIFO is empty */
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1: ldr w1, [x0, #MESON_STATUS_OFFSET]
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tbz w1, #MESON_STATUS_TX_EMPTY_BIT, 1b
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ret
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endfunc console_meson_core_flush
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