+++ /dev/null
-/*
- * Copyright Altera Corporation (C) <2015>. All rights reserved
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef __ASM_NIOS2_PROM_H__
-#define __ASM_NIOS2_PROM_H__
-
-extern unsigned long __init of_early_console(void);
-
-#endif
+++ /dev/null
-/*
- * Early printk for Nios2.
- *
- * Copyright (C) 2015, Altera Corporation
- * Copyright (C) 2010, Tobias Klauser <tklauser@distanz.ch>
- * Copyright (C) 2009, Wind River Systems Inc
- * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-
-#include <linux/console.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/io.h>
-
-#include <asm/prom.h>
-
-static unsigned long base_addr;
-
-#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE)
-
-#define ALTERA_JTAGUART_DATA_REG 0
-#define ALTERA_JTAGUART_CONTROL_REG 4
-#define ALTERA_JTAGUART_CONTROL_WSPACE_MSK 0xFFFF0000
-#define ALTERA_JTAGUART_CONTROL_AC_MSK 0x00000400
-
-#define JUART_GET_CR() \
- __builtin_ldwio((void *)(base_addr + ALTERA_JTAGUART_CONTROL_REG))
-#define JUART_SET_CR(v) \
- __builtin_stwio((void *)(base_addr + ALTERA_JTAGUART_CONTROL_REG), v)
-#define JUART_SET_TX(v) \
- __builtin_stwio((void *)(base_addr + ALTERA_JTAGUART_DATA_REG), v)
-
-static void early_console_write(struct console *con, const char *s, unsigned n)
-{
- unsigned long status;
-
- while (n-- && *s) {
- while (((status = JUART_GET_CR())
- & ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0) {
-#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
- if ((status & ALTERA_JTAGUART_CONTROL_AC_MSK) == 0)
- return; /* no connection activity */
-#endif
- }
- JUART_SET_TX(*s);
- s++;
- }
-}
-
-#elif defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
-
-#define ALTERA_UART_TXDATA_REG 4
-#define ALTERA_UART_STATUS_REG 8
-#define ALTERA_UART_STATUS_TRDY 0x0040
-
-#define UART_GET_SR() \
- __builtin_ldwio((void *)(base_addr + ALTERA_UART_STATUS_REG))
-#define UART_SET_TX(v) \
- __builtin_stwio((void *)(base_addr + ALTERA_UART_TXDATA_REG), v)
-
-static void early_console_putc(char c)
-{
- while (!(UART_GET_SR() & ALTERA_UART_STATUS_TRDY))
- ;
-
- UART_SET_TX(c);
-}
-
-static void early_console_write(struct console *con, const char *s, unsigned n)
-{
- while (n-- && *s) {
- early_console_putc(*s);
- if (*s == '\n')
- early_console_putc('\r');
- s++;
- }
-}
-
-#else
-
-static void early_console_write(struct console *con, const char *s, unsigned n)
-{
-}
-
-#endif
-
-static struct console early_console_prom = {
- .name = "early",
- .write = early_console_write,
- .flags = CON_PRINTBUFFER | CON_BOOT,
- .index = -1
-};
-
-void __init setup_early_printk(void)
-{
-#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) || \
- defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
- base_addr = of_early_console();
-#else
- base_addr = 0;
-#endif
-
- if (!base_addr)
- return;
-
-#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
- /* Clear activity bit so BYPASS doesn't stall if we've used JTAG for
- * downloading the kernel. This might cause early data to be lost even
- * if the JTAG terminal is running.
- */
- JUART_SET_CR(JUART_GET_CR() | ALTERA_JTAGUART_CONTROL_AC_MSK);
-#endif
-
- early_console = &early_console_prom;
- register_console(early_console);
- pr_info("early_console initialized at 0x%08lx\n", base_addr);
-}
#include <linux/of_fdt.h>
#include <linux/io.h>
-#include <asm/prom.h>
#include <asm/sections.h>
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
early_init_dt_scan(params);
}
-
-#ifdef CONFIG_EARLY_PRINTK
-static int __init early_init_dt_scan_serial(unsigned long node,
- const char *uname, int depth, void *data)
-{
- u64 *addr64 = (u64 *) data;
- const char *p;
-
- /* only consider serial nodes */
- if (strncmp(uname, "serial", 6) != 0)
- return 0;
-
- p = of_get_flat_dt_prop(node, "compatible", NULL);
- if (!p)
- return 0;
-
- /*
- * We found an altera_jtaguart but it wasn't configured for console, so
- * skip it.
- */
-#ifndef CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE
- if (strncmp(p, "altr,juart", 10) == 0)
- return 0;
-#endif
-
- /*
- * Same for altera_uart.
- */
-#ifndef CONFIG_SERIAL_ALTERA_UART_CONSOLE
- if (strncmp(p, "altr,uart", 9) == 0)
- return 0;
-#endif
-
- *addr64 = of_flat_dt_translate_address(node);
-
- return *addr64 == OF_BAD_ADDR ? 0 : 1;
-}
-
-unsigned long __init of_early_console(void)
-{
- u64 base = 0;
-
- if (of_scan_flat_dt(early_init_dt_scan_serial, &base))
- return (u32)ioremap(base, 32);
- else
- return 0;
-}
-#endif /* CONFIG_EARLY_PRINTK */
projects / kernel.git / commitdiff