mirror of https://gitee.com/openkylin/linux.git
nios2: remove custom early console implementation
As of commits d8f347ba35cf ("nios2: enable earlycon support"),
0dcc0542a0 ("serial: altera_jtaguart: add earlycon support") and
4d9d7d896d ("serial: altera_uart: add earlycon support"), the nios2
architecture and the altera_uart/altera_jtaguart drivers support
earlycon. Thus, the custom early console implementation for nios2 is no
longer necessary to get early boot messages. Remove it and rely fully on
earlycon support.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
This commit is contained in:
Tobias Klauser
Ley Foon Tan
parent
7f1e614113
commit
e118c3fec9
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@ -1,22 +0,0 @@
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/*
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* Copyright Altera Corporation (C) <2015>. All rights reserved
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_NIOS2_PROM_H__
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#define __ASM_NIOS2_PROM_H__
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extern unsigned long __init of_early_console(void);
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#endif
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@ -30,8 +30,6 @@ extern char fast_handler_end[];
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extern void pagetable_init(void);
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extern void setup_early_printk(void);
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#endif/* __KERNEL__ */
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#endif /* __ASSEMBLY__ */
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@ -20,7 +20,6 @@ obj-y += syscall_table.o
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obj-y += time.o
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obj-y += traps.o
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obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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obj-$(CONFIG_KGDB) += kgdb.o
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_NIOS2_ALIGNMENT_TRAP) += misaligned.o
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@ -1,121 +0,0 @@
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/*
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* Early printk for Nios2.
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*
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* Copyright (C) 2015, Altera Corporation
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* Copyright (C) 2010, Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2009, Wind River Systems Inc
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* Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <asm/prom.h>
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static unsigned long base_addr;
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#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE)
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#define ALTERA_JTAGUART_DATA_REG 0
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#define ALTERA_JTAGUART_CONTROL_REG 4
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#define ALTERA_JTAGUART_CONTROL_WSPACE_MSK 0xFFFF0000
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#define ALTERA_JTAGUART_CONTROL_AC_MSK 0x00000400
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#define JUART_GET_CR() \
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__builtin_ldwio((void *)(base_addr + ALTERA_JTAGUART_CONTROL_REG))
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#define JUART_SET_CR(v) \
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__builtin_stwio((void *)(base_addr + ALTERA_JTAGUART_CONTROL_REG), v)
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#define JUART_SET_TX(v) \
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__builtin_stwio((void *)(base_addr + ALTERA_JTAGUART_DATA_REG), v)
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static void early_console_write(struct console *con, const char *s, unsigned n)
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{
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unsigned long status;
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while (n-- && *s) {
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while (((status = JUART_GET_CR())
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& ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0) {
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#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
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if ((status & ALTERA_JTAGUART_CONTROL_AC_MSK) == 0)
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return; /* no connection activity */
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#endif
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}
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JUART_SET_TX(*s);
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s++;
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}
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}
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#elif defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
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#define ALTERA_UART_TXDATA_REG 4
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#define ALTERA_UART_STATUS_REG 8
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#define ALTERA_UART_STATUS_TRDY 0x0040
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#define UART_GET_SR() \
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__builtin_ldwio((void *)(base_addr + ALTERA_UART_STATUS_REG))
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#define UART_SET_TX(v) \
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__builtin_stwio((void *)(base_addr + ALTERA_UART_TXDATA_REG), v)
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static void early_console_putc(char c)
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{
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while (!(UART_GET_SR() & ALTERA_UART_STATUS_TRDY))
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;
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UART_SET_TX(c);
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}
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static void early_console_write(struct console *con, const char *s, unsigned n)
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{
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while (n-- && *s) {
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early_console_putc(*s);
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if (*s == '\n')
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early_console_putc('\r');
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s++;
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}
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}
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#else
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static void early_console_write(struct console *con, const char *s, unsigned n)
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{
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}
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#endif
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static struct console early_console_prom = {
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.name = "early",
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.write = early_console_write,
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.flags = CON_PRINTBUFFER | CON_BOOT,
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.index = -1
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};
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void __init setup_early_printk(void)
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{
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#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) || \
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defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
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base_addr = of_early_console();
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#else
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base_addr = 0;
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#endif
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if (!base_addr)
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return;
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#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
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/* Clear activity bit so BYPASS doesn't stall if we've used JTAG for
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* downloading the kernel. This might cause early data to be lost even
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* if the JTAG terminal is running.
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*/
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JUART_SET_CR(JUART_GET_CR() | ALTERA_JTAGUART_CONTROL_AC_MSK);
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#endif
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early_console = &early_console_prom;
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register_console(early_console);
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pr_info("early_console initialized at 0x%08lx\n", base_addr);
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}
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@ -30,7 +30,6 @@
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#include <linux/of_fdt.h>
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#include <linux/io.h>
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#include <asm/prom.h>
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#include <asm/sections.h>
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void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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@ -71,51 +70,3 @@ void __init early_init_devtree(void *params)
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early_init_dt_scan(params);
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}
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#ifdef CONFIG_EARLY_PRINTK
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static int __init early_init_dt_scan_serial(unsigned long node,
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const char *uname, int depth, void *data)
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{
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u64 *addr64 = (u64 *) data;
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const char *p;
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/* only consider serial nodes */
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if (strncmp(uname, "serial", 6) != 0)
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return 0;
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p = of_get_flat_dt_prop(node, "compatible", NULL);
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if (!p)
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return 0;
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/*
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* We found an altera_jtaguart but it wasn't configured for console, so
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* skip it.
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*/
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#ifndef CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE
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if (strncmp(p, "altr,juart", 10) == 0)
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return 0;
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#endif
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/*
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* Same for altera_uart.
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*/
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#ifndef CONFIG_SERIAL_ALTERA_UART_CONSOLE
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if (strncmp(p, "altr,uart", 9) == 0)
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return 0;
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#endif
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*addr64 = of_flat_dt_translate_address(node);
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return *addr64 == OF_BAD_ADDR ? 0 : 1;
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}
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unsigned long __init of_early_console(void)
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{
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u64 base = 0;
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if (of_scan_flat_dt(early_init_dt_scan_serial, &base))
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return (u32)ioremap(base, 32);
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else
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return 0;
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}
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#endif /* CONFIG_EARLY_PRINTK */
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@ -147,10 +147,6 @@ void __init setup_arch(char **cmdline_p)
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console_verbose();
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#ifdef CONFIG_EARLY_PRINTK
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setup_early_printk();
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#endif
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memory_start = PAGE_ALIGN((unsigned long)__pa(_end));
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memory_end = (unsigned long) CONFIG_NIOS2_MEM_BASE + memory_size;
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