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microblaze: remove redundant early_printk support
With earlycon support now enabled, the arch specific early_printk support can be removed. Signed-off-by: Rob Herring <robh@kernel.org> Cc: Michal Simek <monstr@monstr.eu> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Rob Herring
Michal Simek
parent
f71044c999
commit
96f0e6fcc9
@ -8,14 +8,6 @@ config TRACE_IRQFLAGS_SUPPORT
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source "lib/Kconfig.debug"
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config EARLY_PRINTK
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bool "Early printk function for kernel"
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depends on SERIAL_UARTLITE_CONSOLE || SERIAL_8250_CONSOLE
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default n
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help
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This option turns on/off early printk messages to console.
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First Uartlite node is taken.
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config HEART_BEAT
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bool "Heart beat function for kernel"
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default n
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@ -1,27 +0,0 @@
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/*
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* Definitions for talking to the Open Firmware PROM on
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* Power Macintosh computers.
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*
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* Copyright (C) 1996-2005 Paul Mackerras.
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*
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* Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_MICROBLAZE_PROM_H
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#define _ASM_MICROBLAZE_PROM_H
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#include <linux/of.h>
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/* Other Prototypes */
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enum early_consoles {
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UARTLITE = 1,
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UART16550 = 2,
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};
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extern int of_early_console(void *version);
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#endif /* _ASM_MICROBLAZE_PROM_H */
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@ -19,16 +19,11 @@ extern char cmd_line[COMMAND_LINE_SIZE];
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extern char *klimit;
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int setup_early_printk(char *opt);
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void remap_early_printk(void);
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void disable_early_printk(void);
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void microblaze_heartbeat(void);
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void microblaze_setup_heartbeat(void);
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# ifdef CONFIG_MMU
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extern void mmu_reset(void);
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extern void early_console_reg_tlb_alloc(unsigned int addr);
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# endif /* CONFIG_MMU */
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extern void of_platform_reset_gpio_probe(void);
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@ -22,7 +22,6 @@ obj-y += dma.o exceptions.o \
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obj-y += cpu/
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obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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obj-$(CONFIG_HEART_BEAT) += heartbeat.o
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obj-$(CONFIG_MODULES) += microblaze_ksyms.o module.o
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obj-$(CONFIG_MMU) += misc.o
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@ -1,184 +0,0 @@
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/*
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* Early printk support for Microblaze.
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*
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* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2007-2009 PetaLogix
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* Copyright (C) 2003-2006 Yasushi SHOJI <yashi@atmark-techno.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/kernel.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/tty.h>
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#include <linux/io.h>
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#include <asm/processor.h>
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#include <linux/fcntl.h>
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#include <asm/setup.h>
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#include <asm/prom.h>
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static u32 base_addr;
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#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
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static void early_printk_uartlite_putc(char c)
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{
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/*
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* Limit how many times we'll spin waiting for TX FIFO status.
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* This will prevent lockups if the base address is incorrectly
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* set, or any other issue on the UARTLITE.
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* This limit is pretty arbitrary, unless we are at about 10 baud
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* we'll never timeout on a working UART.
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*/
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unsigned retries = 1000000;
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/* read status bit - 0x8 offset */
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while (--retries && (in_be32(base_addr + 8) & (1 << 3)))
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;
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/* Only attempt the iowrite if we didn't timeout */
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/* write to TX_FIFO - 0x4 offset */
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if (retries)
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out_be32(base_addr + 4, c & 0xff);
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}
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static void early_printk_uartlite_write(struct console *unused,
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const char *s, unsigned n)
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{
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while (*s && n-- > 0) {
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if (*s == '\n')
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early_printk_uartlite_putc('\r');
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early_printk_uartlite_putc(*s);
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s++;
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}
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}
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static struct console early_serial_uartlite_console = {
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.name = "earlyser",
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.write = early_printk_uartlite_write,
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.flags = CON_PRINTBUFFER | CON_BOOT,
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.index = -1,
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};
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#endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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static void early_printk_uart16550_putc(char c)
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{
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/*
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* Limit how many times we'll spin waiting for TX FIFO status.
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* This will prevent lockups if the base address is incorrectly
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* set, or any other issue on the UARTLITE.
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* This limit is pretty arbitrary, unless we are at about 10 baud
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* we'll never timeout on a working UART.
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*/
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#define UART_LSR_TEMT 0x40 /* Transmitter empty */
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#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */
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#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
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unsigned retries = 10000;
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while (--retries &&
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!((in_be32(base_addr + 0x14) & BOTH_EMPTY) == BOTH_EMPTY))
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;
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if (retries)
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out_be32(base_addr, c & 0xff);
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}
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static void early_printk_uart16550_write(struct console *unused,
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const char *s, unsigned n)
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{
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while (*s && n-- > 0) {
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if (*s == '\n')
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early_printk_uart16550_putc('\r');
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early_printk_uart16550_putc(*s);
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s++;
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}
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}
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static struct console early_serial_uart16550_console = {
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.name = "earlyser",
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.write = early_printk_uart16550_write,
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.flags = CON_PRINTBUFFER | CON_BOOT,
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.index = -1,
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};
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#endif /* CONFIG_SERIAL_8250_CONSOLE */
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int __init setup_early_printk(char *opt)
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{
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int version = 0;
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if (early_console)
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return 1;
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base_addr = of_early_console(&version);
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if (base_addr) {
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#ifdef CONFIG_MMU
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early_console_reg_tlb_alloc(base_addr);
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#endif
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switch (version) {
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#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
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case UARTLITE:
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pr_info("Early console on uartlite at 0x%08x\n",
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base_addr);
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early_console = &early_serial_uartlite_console;
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break;
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#endif
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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case UART16550:
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pr_info("Early console on uart16650 at 0x%08x\n",
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base_addr);
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early_console = &early_serial_uart16550_console;
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break;
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#endif
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default:
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pr_info("Unsupported early console %d\n",
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version);
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return 1;
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}
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register_console(early_console);
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return 0;
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}
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return 1;
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}
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/* Remap early console to virtual address and do not allocate one TLB
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* only for early console because of performance degression */
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void __init remap_early_printk(void)
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{
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if (!early_console)
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return;
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pr_info("early_printk_console remapping from 0x%x to ", base_addr);
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base_addr = (u32) ioremap(base_addr, PAGE_SIZE);
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pr_cont("0x%x\n", base_addr);
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#ifdef CONFIG_MMU
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/*
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* Early console is on the top of skipped TLB entries
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* decrease tlb_skip size ensure that hardcoded TLB entry will be
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* used by generic algorithm
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* FIXME check if early console mapping is on the top by rereading
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* TLB entry and compare baseaddr
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* mts rtlbx, (tlb_skip - 1)
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* nop
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* mfs rX, rtlblo
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* nop
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* cmp rX, orig_base_addr
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*/
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tlb_skip -= 1;
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#endif
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}
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void __init disable_early_printk(void)
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{
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if (!early_console)
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return;
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pr_warn("disabling early console\n");
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unregister_console(early_console);
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early_console = NULL;
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}
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@ -63,38 +63,3 @@ _tlbie_1:
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nop
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.size _tlbie, . - _tlbie
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/*
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* Allocate TLB entry for early console
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*/
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.globl early_console_reg_tlb_alloc;
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.type early_console_reg_tlb_alloc, @function
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.align 4;
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early_console_reg_tlb_alloc:
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/*
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* Load a TLB entry for the UART, so that microblaze_progress() can use
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* the UARTs nice and early. We use a 4k real==virtual mapping.
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*/
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lwi r4, r0, tlb_skip
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mts rtlbx, r4 /* TLB slot 63 */
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or r4,r5,r0
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andi r4,r4,0xfffff000
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ori r4,r4,(TLB_WR|TLB_I|TLB_M|TLB_G)
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andi r5,r5,0xfffff000
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ori r5,r5,(TLB_VALID | TLB_PAGESZ(PAGESZ_4K))
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mts rtlblo,r4 /* Load the data portion of the entry */
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nop
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mts rtlbhi,r5 /* Load the tag portion of the entry */
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nop
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lwi r5, r0, tlb_skip
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addik r5, r5, 1
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swi r5, r0, tlb_skip
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rtsd r15, 8
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nop
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.size early_console_reg_tlb_alloc, . - early_console_reg_tlb_alloc
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@ -13,91 +13,11 @@
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* 2 of the License, or (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/threads.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/stringify.h>
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#include <linux/delay.h>
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#include <linux/initrd.h>
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#include <linux/bitops.h>
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#include <linux/kexec.h>
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#include <linux/debugfs.h>
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#include <linux/irq.h>
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#include <linux/memblock.h>
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#include <linux/of_fdt.h>
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#include <asm/prom.h>
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#include <asm/page.h>
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#include <asm/processor.h>
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#include <asm/irq.h>
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#include <linux/io.h>
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#include <asm/mmu.h>
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#include <asm/pgtable.h>
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#include <asm/sections.h>
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#include <asm/pci-bridge.h>
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#ifdef CONFIG_EARLY_PRINTK
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static const char *stdout;
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static int __init early_init_dt_scan_chosen_serial(unsigned long node,
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const char *uname, int depth, void *data)
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{
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int l;
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const char *p;
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pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname);
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if (depth == 1 && (strcmp(uname, "chosen") == 0 ||
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strcmp(uname, "chosen@0") == 0)) {
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p = of_get_flat_dt_prop(node, "linux,stdout-path", &l);
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if (p != NULL && l > 0)
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stdout = p; /* store pointer to stdout-path */
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}
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if (stdout && strstr(stdout, uname)) {
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p = of_get_flat_dt_prop(node, "compatible", &l);
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pr_debug("Compatible string: %s\n", p);
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if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) ||
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(strncmp(p, "xlnx,axi-uart16550", 18) == 0)) {
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unsigned int addr;
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*(u32 *)data = UART16550;
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addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
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addr += *(u32 *)of_get_flat_dt_prop(node,
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"reg-offset", &l);
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/* clear register offset */
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return be32_to_cpu(addr) & ~3;
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}
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if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) ||
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(strncmp(p, "xlnx,opb-uartlite", 17) == 0) ||
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(strncmp(p, "xlnx,axi-uartlite", 17) == 0) ||
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(strncmp(p, "xlnx,mdm", 8) == 0)) {
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const unsigned int *addrp;
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*(u32 *)data = UARTLITE;
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addrp = of_get_flat_dt_prop(node, "reg", &l);
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return be32_to_cpup(addrp); /* return address */
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}
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}
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return 0;
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}
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/* this function is looking for early console - Microblaze specific */
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int __init of_early_console(void *version)
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{
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return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version);
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}
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#endif
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void __init early_init_devtree(void *params)
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{
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pr_debug(" -> early_init_devtree(%p)\n", params);
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@ -106,8 +26,6 @@ void __init early_init_devtree(void *params)
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if (!strlen(boot_command_line))
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strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
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parse_early_param();
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memblock_allow_resize();
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pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
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@ -27,13 +27,12 @@
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#include <linux/param.h>
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#include <linux/pci.h>
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#include <linux/cache.h>
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#include <linux/of_platform.h>
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#include <linux/of.h>
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#include <linux/dma-mapping.h>
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#include <asm/cacheflush.h>
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#include <asm/entry.h>
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#include <asm/cpuinfo.h>
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#include <asm/prom.h>
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#include <asm/pgtable.h>
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DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */
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@ -54,6 +53,9 @@ void __init setup_arch(char **cmdline_p)
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{
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*cmdline_p = boot_command_line;
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setup_memory();
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parse_early_param();
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console_verbose();
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unflatten_device_tree();
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@ -62,13 +64,6 @@ void __init setup_arch(char **cmdline_p)
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microblaze_cache_init();
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setup_memory();
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#ifdef CONFIG_EARLY_PRINTK
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/* remap early console to virtual address */
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remap_early_printk();
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#endif
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xilinx_pci_init();
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#if defined(CONFIG_DUMMY_CONSOLE)
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@ -133,10 +128,6 @@ void __init machine_early_init(const char *cmdline, unsigned int ram,
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/* initialize device tree for usage in early_printk */
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early_init_devtree(_fdt_start);
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#ifdef CONFIG_EARLY_PRINTK
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setup_early_printk(NULL);
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#endif
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/* setup kernel_tlb after BSS cleaning
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* Maybe worth to move to asm code */
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kernel_tlb = tlb0 + tlb1;
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