diff options
Diffstat (limited to 'arch/microblaze/kernel/early_printk.c')
| -rw-r--r-- | arch/microblaze/kernel/early_printk.c | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/arch/microblaze/kernel/early_printk.c b/arch/microblaze/kernel/early_printk.c deleted file mode 100644 index 365f2d53f1b29..0000000000000 --- a/arch/microblaze/kernel/early_printk.c +++ /dev/null @@ -1,184 +0,0 @@ -/* - * Early printk support for Microblaze. - * - * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> - * Copyright (C) 2007-2009 PetaLogix - * Copyright (C) 2003-2006 Yasushi SHOJI <yashi@atmark-techno.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/kernel.h> -#include <linux/init.h> -#include <linux/string.h> -#include <linux/tty.h> -#include <linux/io.h> -#include <asm/processor.h> -#include <linux/fcntl.h> -#include <asm/setup.h> -#include <asm/prom.h> - -static u32 base_addr; - -#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE -static void early_printk_uartlite_putc(char c) -{ - /* - * Limit how many times we'll spin waiting for TX FIFO status. - * This will prevent lockups if the base address is incorrectly - * set, or any other issue on the UARTLITE. - * This limit is pretty arbitrary, unless we are at about 10 baud - * we'll never timeout on a working UART. - */ - - unsigned retries = 1000000; - /* read status bit - 0x8 offset */ - while (--retries && (in_be32(base_addr + 8) & (1 << 3))) - ; - - /* Only attempt the iowrite if we didn't timeout */ - /* write to TX_FIFO - 0x4 offset */ - if (retries) - out_be32(base_addr + 4, c & 0xff); -} - -static void early_printk_uartlite_write(struct console *unused, - const char *s, unsigned n) -{ - while (*s && n-- > 0) { - if (*s == '\n') - early_printk_uartlite_putc('\r'); - early_printk_uartlite_putc(*s); - s++; - } -} - -static struct console early_serial_uartlite_console = { - .name = "earlyser", - .write = early_printk_uartlite_write, - .flags = CON_PRINTBUFFER | CON_BOOT, - .index = -1, -}; -#endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */ - -#ifdef CONFIG_SERIAL_8250_CONSOLE -static void early_printk_uart16550_putc(char c) -{ - /* - * Limit how many times we'll spin waiting for TX FIFO status. - * This will prevent lockups if the base address is incorrectly - * set, or any other issue on the UARTLITE. - * This limit is pretty arbitrary, unless we are at about 10 baud - * we'll never timeout on a working UART. - */ - - #define UART_LSR_TEMT 0x40 /* Transmitter empty */ - #define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */ - #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) - - unsigned retries = 10000; - - while (--retries && - !((in_be32(base_addr + 0x14) & BOTH_EMPTY) == BOTH_EMPTY)) - ; - - if (retries) - out_be32(base_addr, c & 0xff); -} - -static void early_printk_uart16550_write(struct console *unused, - const char *s, unsigned n) -{ - while (*s && n-- > 0) { - if (*s == '\n') - early_printk_uart16550_putc('\r'); - early_printk_uart16550_putc(*s); - s++; - } -} - -static struct console early_serial_uart16550_console = { - .name = "earlyser", - .write = early_printk_uart16550_write, - .flags = CON_PRINTBUFFER | CON_BOOT, - .index = -1, -}; -#endif /* CONFIG_SERIAL_8250_CONSOLE */ - -int __init setup_early_printk(char *opt) -{ - int version = 0; - - if (early_console) - return 1; - - base_addr = of_early_console(&version); - if (base_addr) { -#ifdef CONFIG_MMU - early_console_reg_tlb_alloc(base_addr); -#endif - switch (version) { -#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE - case UARTLITE: - pr_info("Early console on uartlite at 0x%08x\n", - base_addr); - early_console = &early_serial_uartlite_console; - break; -#endif -#ifdef CONFIG_SERIAL_8250_CONSOLE - case UART16550: - pr_info("Early console on uart16650 at 0x%08x\n", - base_addr); - early_console = &early_serial_uart16550_console; - break; -#endif - default: - pr_info("Unsupported early console %d\n", - version); - return 1; - } - - register_console(early_console); - return 0; - } - return 1; -} - -/* Remap early console to virtual address and do not allocate one TLB - * only for early console because of performance degression */ -void __init remap_early_printk(void) -{ - if (!early_console) - return; - pr_info("early_printk_console remapping from 0x%x to ", base_addr); - base_addr = (u32) ioremap(base_addr, PAGE_SIZE); - pr_cont("0x%x\n", base_addr); - -#ifdef CONFIG_MMU - /* - * Early console is on the top of skipped TLB entries - * decrease tlb_skip size ensure that hardcoded TLB entry will be - * used by generic algorithm - * FIXME check if early console mapping is on the top by rereading - * TLB entry and compare baseaddr - * mts rtlbx, (tlb_skip - 1) - * nop - * mfs rX, rtlblo - * nop - * cmp rX, orig_base_addr - */ - tlb_skip -= 1; -#endif -} - -void __init disable_early_printk(void) -{ - if (!early_console) - return; - pr_warn("disabling early console\n"); - unregister_console(early_console); - early_console = NULL; -} |