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https://github.com/brain-hackers/u-boot-brain
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d5cf32977f
For ARM32 architecture, CONFIG_DEBUG_LL is available for early low-level debugging (and actually UniPhier 32bit SoCs use it), but ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART is available as an architecture-independent debug facility. This commit supports it on all the UniPhier SoCs (including the new ARMv8 SoCs), which is very useful for new SoC bringups. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/*
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* Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <debug_uart.h>
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#include <linux/io.h>
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#include <linux/serial_reg.h>
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#include "../soc-info.h"
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#include "debug-uart.h"
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#define UNIPHIER_UART_TX 0x00
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#define UNIPHIER_UART_LCR_MCR 0x10
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#define UNIPHIER_UART_LSR 0x14
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#define UNIPHIER_UART_LDR 0x24
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static void _debug_uart_putc(int c)
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{
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void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
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while (!(readl(base + UNIPHIER_UART_LSR) & UART_LSR_THRE))
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;
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writel(c, base + UNIPHIER_UART_TX);
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}
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void _debug_uart_init(void)
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{
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void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
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unsigned int divisor;
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switch (uniphier_get_soc_type()) {
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#if defined(CONFIG_ARCH_UNIPHIER_SLD3)
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case SOC_UNIPHIER_SLD3:
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divisor = uniphier_sld3_debug_uart_init();
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break;
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#endif
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#if defined(CONFIG_ARCH_UNIPHIER_LD4)
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case SOC_UNIPHIER_LD4:
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divisor = uniphier_ld4_debug_uart_init();
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break;
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#endif
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#if defined(CONFIG_ARCH_UNIPHIER_PRO4)
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case SOC_UNIPHIER_PRO4:
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divisor = uniphier_pro4_debug_uart_init();
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break;
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#endif
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#if defined(CONFIG_ARCH_UNIPHIER_SLD8)
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case SOC_UNIPHIER_SLD8:
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divisor = uniphier_sld8_debug_uart_init();
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break;
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#endif
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#if defined(CONFIG_ARCH_UNIPHIER_PRO5)
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case SOC_UNIPHIER_PRO5:
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divisor = uniphier_pro5_debug_uart_init();
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break;
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#endif
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#if defined(CONFIG_ARCH_UNIPHIER_PXS2)
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case SOC_UNIPHIER_PXS2:
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divisor = uniphier_pxs2_debug_uart_init();
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break;
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#endif
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#if defined(CONFIG_ARCH_UNIPHIER_LD6B)
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case SOC_UNIPHIER_LD6B:
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divisor = uniphier_ld6b_debug_uart_init();
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break;
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#endif
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#if defined(CONFIG_ARCH_UNIPHIER_LD11) || defined(CONFIG_ARCH_UNIPHIER_LD20)
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case SOC_UNIPHIER_LD11:
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case SOC_UNIPHIER_LD20:
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divisor = uniphier_ld20_debug_uart_init();
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break;
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#endif
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default:
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return;
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}
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writel(UART_LCR_WLEN8 << 8, base + UNIPHIER_UART_LCR_MCR);
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writel(divisor, base + UNIPHIER_UART_LDR);
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}
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DEBUG_UART_FUNCS
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