1b820eaf42
Versatile Express platform can be used in different configurations, the console UART used by early printk may be located at different addresses in the address space. This patch makes it possible to select the base address of a PL011 UART to be used as a console output in the kernel configuration. The default behaviour is still the heuristic detecting memory map on Cortex-A core tiles. The zImage decompressor will use the same configuration values or print out nothing if DEBUG_LL is not enabled. Signed-off-by: Pawel Moll <pawel.moll@arm.com>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
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* arch/arm/mach-vexpress/include/mach/uncompress.h
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*
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* Copyright (C) 2003 ARM Limited
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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
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define AMBA_UART_DR(base) (*(volatile unsigned char *)((base) + 0x00))
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#define AMBA_UART_LCRH(base) (*(volatile unsigned char *)((base) + 0x2c))
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#define AMBA_UART_CR(base) (*(volatile unsigned char *)((base) + 0x30))
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#define AMBA_UART_FR(base) (*(volatile unsigned char *)((base) + 0x18))
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#define UART_BASE 0x10009000
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#define UART_BASE_RS1 0x1c090000
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static unsigned long get_uart_base(void)
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{
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#if defined(CONFIG_DEBUG_VEXPRESS_UART0_DETECT)
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unsigned long mpcore_periph;
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/*
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* Make an educated guess regarding the memory map:
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* - the original A9 core tile, which has MPCore peripherals
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* located at 0x1e000000, should use UART at 0x10009000
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* - all other (RS1 complaint) tiles use UART mapped
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* at 0x1c090000
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*/
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asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (mpcore_periph));
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if (mpcore_periph == 0x1e000000)
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return UART_BASE;
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else
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return UART_BASE_RS1;
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#elif defined(CONFIG_DEBUG_VEXPRESS_UART0_CA9)
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return UART_BASE;
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#elif defined(CONFIG_DEBUG_VEXPRESS_UART0_RS1)
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return UART_BASE_RS1;
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#else
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return 0;
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#endif
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}
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/*
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* This does not append a newline
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*/
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static inline void putc(int c)
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{
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unsigned long base = get_uart_base();
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if (!base)
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return;
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while (AMBA_UART_FR(base) & (1 << 5))
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barrier();
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AMBA_UART_DR(base) = c;
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}
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static inline void flush(void)
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{
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unsigned long base = get_uart_base();
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if (!base)
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return;
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while (AMBA_UART_FR(base) & (1 << 3))
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barrier();
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}
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/*
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* nothing to do
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*/
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#define arch_decomp_setup()
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#define arch_decomp_wdog()
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