diff options
Diffstat (limited to 'arch/nios2/kernel/early_printk.c')
| -rw-r--r-- | arch/nios2/kernel/early_printk.c | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/arch/nios2/kernel/early_printk.c b/arch/nios2/kernel/early_printk.c deleted file mode 100644 index 4a7bb98f744c..000000000000 --- a/arch/nios2/kernel/early_printk.c +++ /dev/null @@ -1,121 +0,0 @@ -/* - * 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); -} |