The low-level debugging functions are useful to debug the early boot stage where the full UART driver is not available. UniPhier SoCs need to initialize the UART port 0 to use this feature. The initialization routine is called at the very entry of the lowlevel_init(). Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>master
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/* |
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* On-chip UART initializaion for low-level debugging |
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* |
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* Copyright (C) 2014 Panasonic Corporation |
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* Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/arch/sg-regs.h> |
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#define UART_CLK 36864000 |
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#include <asm/arch/debug-uart.S> |
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ENTRY(setup_lowlevel_debug) |
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init_debug_uart r0, r1, r2 |
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/* UART Port 0 */ |
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set_pinsel 85, 1, r0, r1 |
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set_pinsel 88, 1, r0, r1 |
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ldr r0, =SG_IECTRL |
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ldr r1, [r0] |
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orr r1, r1, #1 |
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str r1, [r0] |
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mov pc, lr |
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ENDPROC(setup_lowlevel_debug) |
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/* |
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* On-chip UART initializaion for low-level debugging |
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* |
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* Copyright (C) 2014 Panasonic Corporation |
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* Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/arch/sc-regs.h> |
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#include <asm/arch/sg-regs.h> |
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#define UART_CLK 73728000 |
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#include <asm/arch/debug-uart.S> |
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ENTRY(setup_lowlevel_debug) |
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ldr r0, =SC_CLKCTRL |
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ldr r1, [r0] |
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orr r1, r1, #SC_CLKCTRL_CLK_PERI |
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str r1, [r0] |
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init_debug_uart r0, r1, r2 |
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/* UART Port 0 */ |
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set_pinsel 127, 0, r0, r1 |
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set_pinsel 128, 0, r0, r1 |
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ldr r0, =SG_LOADPINCTRL |
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mov r1, #1 |
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str r1, [r0] |
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ldr r0, =SG_IECTRL |
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ldr r1, [r0] |
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orr r1, r1, #1 |
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str r1, [r0] |
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mov pc, lr |
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ENDPROC(setup_lowlevel_debug) |
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/* |
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* On-chip UART initializaion for low-level debugging |
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* |
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* Copyright (C) 2014 Panasonic Corporation |
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* Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/arch/sg-regs.h> |
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#define UART_CLK 80000000 |
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#include <asm/arch/debug-uart.S> |
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ENTRY(setup_lowlevel_debug) |
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init_debug_uart r0, r1, r2 |
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/* UART Port 0 */ |
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set_pinsel 70, 3, r0, r1 |
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set_pinsel 71, 3, r0, r1 |
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ldr r0, =SG_IECTRL |
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ldr r1, [r0] |
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orr r1, r1, #1 |
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str r1, [r0] |
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mov pc, lr |
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ENDPROC(setup_lowlevel_debug) |
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/* |
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* Copyright (C) 2014 Panasonic Corporation |
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* Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <linux/serial_reg.h> |
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#if !defined(CONFIG_DEBUG_SEMIHOSTING) |
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#include CONFIG_DEBUG_LL_INCLUDE |
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#endif |
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#define BAUDRATE 115200 |
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#define DIV_ROUND(x, d) (((x) + ((d) / 2)) / (d)) |
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#define DIVISOR DIV_ROUND(UART_CLK, 16 * BAUDRATE) |
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.macro init_debug_uart, ra, rb, rc |
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addruart \ra, \rb, \rc |
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mov \rb, #UART_LCR_WLEN8 |
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strb \rb, [\ra, #0x11] |
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ldr \rb, =DIVISOR |
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str \rb, [\ra, #0x24] |
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.endm |
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