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132 lines
3.4 KiB
132 lines
3.4 KiB
4 months ago
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/*
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* Copyright (c) Linaro 2018 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 <arch.h>
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#include <asm_macros.S>
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#include <assert_macros.S>
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#include <imx_uart.h>
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#include <platform_def.h>
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.globl imx_crash_uart_init
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.globl imx_crash_uart_putc
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/* -----------------------------------------------
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* int imx_crash_uart_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: r0 - console base address
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* r1 - Uart clock in Hz
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* r2 - Baud rate
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* Out: return 1 on success else 0 on error
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* Clobber list : r1, r2, r3, r4
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* -----------------------------------------------
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*/
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func imx_crash_uart_init
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/* Free up r1 as a scratch reg */
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mov r4, r0
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mov r0, r1
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/* Reset UART via CR2 */
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add r1, r4, #IMX_UART_CR2_OFFSET
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movs r3, #0
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str r3, [r4, #IMX_UART_CR2_OFFSET]
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/* Wait for reset complete */
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__wait_cr2_reset:
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ldr r3, [r1, #0]
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ands r3, #IMX_UART_CR2_SRST
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beq __wait_cr2_reset
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/* Enable UART */
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movs r3, #IMX_UART_CR1_UARTEN
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mov r1, r2
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str r3, [r4, #IMX_UART_CR1_OFFSET]
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/*
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* Ignore RTC/CTS - disable reset
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* Magic value #16423 =>
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* IMX_UART_CR2_IRTS | IMX_UART_CR2_WS | IMX_UART_CR2_TXEN | IMX_UART_CR2_RXEN | IMX_UART_CR2_SRST
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*/
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movw r3, #16423
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str r3, [r4, #IMX_UART_CR2_OFFSET]
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/*
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* No parity, autobaud detect-old, rxdmuxsel=1 (fixed i.mx7)
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* Magic value => #132
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* IMX_UART_CR3_ADNIMP | IMX_UART_CR3_RXDMUXSEL
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*/
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movs r3, #132
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str r3, [r4, #IMX_UART_CR3_OFFSET]
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/*
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* Set CTS FIFO trigger to 32 bytes bits 15:10
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* Magic value => #32768
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* FIFO trigger bitmask 100000
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* */
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mov r3, #32768
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str r3, [r4, #IMX_UART_CR4_OFFSET]
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/*
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* TX/RX-thresh = 2 bytes, DCE (bit6 = 0), refclk @24MHz / 4
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* Magic value #2562
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* IMX_UART_FCR_TXTL(TX_RX_THRESH) | IMX_UART_FCR_RXTL(TX_RX_THRESH) | IMX_UART_FCR_RFDIV2
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*/
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#ifdef IMX_UART_DTE
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movw r3, #2626
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#else
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movw r3, #2562
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#endif
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str r3, [r4, #IMX_UART_FCR_OFFSET]
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/* This BIR should be set to 0x0F prior to writing the BMR */
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movs r3, #15
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str r3, [r4, #IMX_UART_BIR_OFFSET]
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/* Hard-code to 115200 @ 24 MHz */
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movs r0, #104
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str r0, [r4, #IMX_UART_BMR_OFFSET]
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/* Indicate success */
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movs r0, #1
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bx lr
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endfunc imx_crash_uart_init
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/* --------------------------------------------------------
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* int imx_crash_uart_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 : r0 - character to be printed
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* r1 - console base address
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* Out : return -1 on error else return character.
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* Clobber list : r2
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* --------------------------------------------------------
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*/
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func imx_crash_uart_putc
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/* Output specified character to UART shift-register */
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str r0, [r1, #IMX_UART_TXD_OFFSET]
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/* Wait for transmit IMX_UART_STAT2_OFFSET.IMX_UART_STAT2_TXDC == 1 */
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__putc_spin_ready:
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ldr r2, [r1, #IMX_UART_STAT2_OFFSET]
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ands r2, #IMX_UART_STAT2_TXDC
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beq __putc_spin_ready
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/* Transmit complete do we need to fixup \n to \n\r */
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cmp r0, #10
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beq __putc_fixup_lf
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/* No fixup necessary - exit here */
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movs r0, #0
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bx lr
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/* Fixup \n to \n\r */
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__putc_fixup_lf:
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movs r0, #13
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b imx_crash_uart_putc
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endfunc imx_crash_uart_putc
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