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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-18 17:46:47 +07:00
d2c215aac5
The generic option DEBUG_LL_UART_PL01X is now used to select the UART
type for the kernel low-level debugging on the ep93xx platform. This
enables two config options to provide the physical and virtual base
address of the debug UART.
Use the generic options instead of providing platform specific options
to select the debug UART.
UART1 is selected with: DEBUG_UART_PHYS = 0x808c0000
DEBUG_UART_VIRT = 0xfedc0000
UART2 is selected with: DEBUG_UART_PHYS = 0x808d0000
DEBUG_UART_VIRT = 0xfedd0000
UART3 is selected with: DEBUG_UART_PHYS = 0x808e0000
DEBUG_UART_VIRT = 0xfede0000
The selected UART must already be initialized by the bootloader. If it
isn't setup nothing will appear (which might be desired).
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ryan Mallon <rmallon@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/*
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* arch/arm/mach-ep93xx/include/mach/uncompress.h
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*
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* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*/
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#include <mach/ep93xx-regs.h>
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static unsigned char __raw_readb(unsigned int ptr)
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{
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return *((volatile unsigned char *)ptr);
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}
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static unsigned int __raw_readl(unsigned int ptr)
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{
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return *((volatile unsigned int *)ptr);
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}
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static void __raw_writeb(unsigned char value, unsigned int ptr)
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{
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*((volatile unsigned char *)ptr) = value;
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}
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static void __raw_writel(unsigned int value, unsigned int ptr)
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{
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*((volatile unsigned int *)ptr) = value;
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}
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#define PHYS_UART_DATA (CONFIG_DEBUG_UART_PHYS + 0x00)
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#define PHYS_UART_FLAG (CONFIG_DEBUG_UART_PHYS + 0x18)
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#define UART_FLAG_TXFF 0x20
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static inline void putc(int c)
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{
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int i;
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for (i = 0; i < 10000; i++) {
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/* Transmit fifo not full? */
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if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF))
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break;
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}
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__raw_writeb(c, PHYS_UART_DATA);
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}
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static inline void flush(void)
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{
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}
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/*
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* Some bootloaders don't turn off DMA from the ethernet MAC before
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* jumping to linux, which means that we might end up with bits of RX
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* status and packet data scribbled over the uncompressed kernel image.
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* Work around this by resetting the ethernet MAC before we uncompress.
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*/
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#define PHYS_ETH_SELF_CTL 0x80010020
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#define ETH_SELF_CTL_RESET 0x00000001
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static void ethernet_reset(void)
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{
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unsigned int v;
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/* Reset the ethernet MAC. */
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v = __raw_readl(PHYS_ETH_SELF_CTL);
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__raw_writel(v | ETH_SELF_CTL_RESET, PHYS_ETH_SELF_CTL);
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/* Wait for reset to finish. */
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while (__raw_readl(PHYS_ETH_SELF_CTL) & ETH_SELF_CTL_RESET)
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;
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}
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static void arch_decomp_setup(void)
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{
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ethernet_reset();
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}
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