[PATCH 2/3] microblaze: remove redundant early_printk support
From: Rob Herring
Date: Wed Feb 28 2018 - 17:40:14 EST
With earlycon support now enabled, the arch specific early_printk support
can be removed.
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
Cc: Michal Simek <monstr@xxxxxxxxx>
---
arch/microblaze/Kconfig.debug | 8 --
arch/microblaze/include/asm/prom.h | 27 -----
arch/microblaze/kernel/Makefile | 1 -
arch/microblaze/kernel/early_printk.c | 184 ----------------------------------
arch/microblaze/kernel/misc.S | 35 -------
arch/microblaze/kernel/prom.c | 80 ---------------
arch/microblaze/kernel/setup.c | 12 +--
7 files changed, 1 insertion(+), 346 deletions(-)
delete mode 100644 arch/microblaze/include/asm/prom.h
delete mode 100644 arch/microblaze/kernel/early_printk.c
diff --git a/arch/microblaze/Kconfig.debug b/arch/microblaze/Kconfig.debug
index 012e377330cd..331a3bb66297 100644
--- a/arch/microblaze/Kconfig.debug
+++ b/arch/microblaze/Kconfig.debug
@@ -8,14 +8,6 @@ config TRACE_IRQFLAGS_SUPPORT
source "lib/Kconfig.debug"
-config EARLY_PRINTK
- bool "Early printk function for kernel"
- depends on SERIAL_UARTLITE_CONSOLE || SERIAL_8250_CONSOLE
- default n
- help
- This option turns on/off early printk messages to console.
- First Uartlite node is taken.
-
config HEART_BEAT
bool "Heart beat function for kernel"
default n
diff --git a/arch/microblaze/include/asm/prom.h b/arch/microblaze/include/asm/prom.h
deleted file mode 100644
index 2f03ac815851..000000000000
--- a/arch/microblaze/include/asm/prom.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- * Definitions for talking to the Open Firmware PROM on
- * Power Macintosh computers.
- *
- * Copyright (C) 1996-2005 Paul Mackerras.
- *
- * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-#ifndef _ASM_MICROBLAZE_PROM_H
-#define _ASM_MICROBLAZE_PROM_H
-
-#include <linux/of.h>
-
-/* Other Prototypes */
-enum early_consoles {
- UARTLITE = 1,
- UART16550 = 2,
-};
-
-extern int of_early_console(void *version);
-
-#endif /* _ASM_MICROBLAZE_PROM_H */
diff --git a/arch/microblaze/kernel/Makefile b/arch/microblaze/kernel/Makefile
index 0da76fa1ab17..7e99cf6984a1 100644
--- a/arch/microblaze/kernel/Makefile
+++ b/arch/microblaze/kernel/Makefile
@@ -22,7 +22,6 @@ obj-y += dma.o exceptions.o \
obj-y += cpu/
-obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_HEART_BEAT) += heartbeat.o
obj-$(CONFIG_MODULES) += microblaze_ksyms.o module.o
obj-$(CONFIG_MMU) += misc.o
diff --git a/arch/microblaze/kernel/early_printk.c b/arch/microblaze/kernel/early_printk.c
deleted file mode 100644
index 365f2d53f1b2..000000000000
--- 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@xxxxxxxxx>
- * Copyright (C) 2007-2009 PetaLogix
- * Copyright (C) 2003-2006 Yasushi SHOJI <yashi@xxxxxxxxxxxxxxxxx>
- *
- * 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;
-}
diff --git a/arch/microblaze/kernel/misc.S b/arch/microblaze/kernel/misc.S
index 1dafddeb8a0b..6759af688451 100644
--- a/arch/microblaze/kernel/misc.S
+++ b/arch/microblaze/kernel/misc.S
@@ -63,38 +63,3 @@ _tlbie_1:
nop
.size _tlbie, . - _tlbie
-
-/*
- * Allocate TLB entry for early console
- */
-.globl early_console_reg_tlb_alloc;
-.type early_console_reg_tlb_alloc, @function
-.align 4;
-early_console_reg_tlb_alloc:
- /*
- * Load a TLB entry for the UART, so that microblaze_progress() can use
- * the UARTs nice and early. We use a 4k real==virtual mapping.
- */
- lwi r4, r0, tlb_skip
- mts rtlbx, r4 /* TLB slot 63 */
-
- or r4,r5,r0
- andi r4,r4,0xfffff000
- ori r4,r4,(TLB_WR|TLB_I|TLB_M|TLB_G)
-
- andi r5,r5,0xfffff000
- ori r5,r5,(TLB_VALID | TLB_PAGESZ(PAGESZ_4K))
-
- mts rtlblo,r4 /* Load the data portion of the entry */
- nop
- mts rtlbhi,r5 /* Load the tag portion of the entry */
- nop
-
- lwi r5, r0, tlb_skip
- addik r5, r5, 1
- swi r5, r0, tlb_skip
-
- rtsd r15, 8
- nop
-
- .size early_console_reg_tlb_alloc, . - early_console_reg_tlb_alloc
diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
index 68f099960ebc..f15cc1933bab 100644
--- a/arch/microblaze/kernel/prom.c
+++ b/arch/microblaze/kernel/prom.c
@@ -13,91 +13,11 @@
* 2 of the License, or (at your option) any later version.
*/
-#include <stdarg.h>
-#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/string.h>
-#include <linux/init.h>
-#include <linux/threads.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-#include <linux/pci.h>
-#include <linux/stringify.h>
-#include <linux/delay.h>
-#include <linux/initrd.h>
-#include <linux/bitops.h>
-#include <linux/kexec.h>
-#include <linux/debugfs.h>
-#include <linux/irq.h>
#include <linux/memblock.h>
#include <linux/of_fdt.h>
-#include <asm/prom.h>
-#include <asm/page.h>
-#include <asm/processor.h>
-#include <asm/irq.h>
-#include <linux/io.h>
-#include <asm/mmu.h>
-#include <asm/pgtable.h>
-#include <asm/sections.h>
-#include <asm/pci-bridge.h>
-
-#ifdef CONFIG_EARLY_PRINTK
-static const char *stdout;
-
-static int __init early_init_dt_scan_chosen_serial(unsigned long node,
- const char *uname, int depth, void *data)
-{
- int l;
- const char *p;
-
- pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname);
-
- if (depth == 1 && (strcmp(uname, "chosen") == 0 ||
- strcmp(uname, "chosen@0") == 0)) {
- p = of_get_flat_dt_prop(node, "linux,stdout-path", &l);
- if (p != NULL && l > 0)
- stdout = p; /* store pointer to stdout-path */
- }
-
- if (stdout && strstr(stdout, uname)) {
- p = of_get_flat_dt_prop(node, "compatible", &l);
- pr_debug("Compatible string: %s\n", p);
-
- if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) ||
- (strncmp(p, "xlnx,axi-uart16550", 18) == 0)) {
- unsigned int addr;
-
- *(u32 *)data = UART16550;
-
- addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
- addr += *(u32 *)of_get_flat_dt_prop(node,
- "reg-offset", &l);
- /* clear register offset */
- return be32_to_cpu(addr) & ~3;
- }
- if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) ||
- (strncmp(p, "xlnx,opb-uartlite", 17) == 0) ||
- (strncmp(p, "xlnx,axi-uartlite", 17) == 0) ||
- (strncmp(p, "xlnx,mdm", 8) == 0)) {
- const unsigned int *addrp;
-
- *(u32 *)data = UARTLITE;
-
- addrp = of_get_flat_dt_prop(node, "reg", &l);
- return be32_to_cpup(addrp); /* return address */
- }
- }
- return 0;
-}
-
-/* this function is looking for early console - Microblaze specific */
-int __init of_early_console(void *version)
-{
- return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version);
-}
-#endif
-
void __init early_init_devtree(void *params)
{
pr_debug(" -> early_init_devtree(%p)\n", params);
diff --git a/arch/microblaze/kernel/setup.c b/arch/microblaze/kernel/setup.c
index be98ffe28ca8..bd47aba352af 100644
--- a/arch/microblaze/kernel/setup.c
+++ b/arch/microblaze/kernel/setup.c
@@ -27,13 +27,12 @@
#include <linux/param.h>
#include <linux/pci.h>
#include <linux/cache.h>
-#include <linux/of_platform.h>
+#include <linux/of.h>
#include <linux/dma-mapping.h>
#include <asm/cacheflush.h>
#include <asm/entry.h>
#include <asm/cpuinfo.h>
-#include <asm/prom.h>
#include <asm/pgtable.h>
DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */
@@ -64,11 +63,6 @@ void __init setup_arch(char **cmdline_p)
setup_memory();
-#ifdef CONFIG_EARLY_PRINTK
- /* remap early console to virtual address */
- remap_early_printk();
-#endif
-
xilinx_pci_init();
#if defined(CONFIG_DUMMY_CONSOLE)
@@ -133,10 +127,6 @@ void __init machine_early_init(const char *cmdline, unsigned int ram,
/* initialize device tree for usage in early_printk */
early_init_devtree(_fdt_start);
-#ifdef CONFIG_EARLY_PRINTK
- setup_early_printk(NULL);
-#endif
-
/* setup kernel_tlb after BSS cleaning
* Maybe worth to move to asm code */
kernel_tlb = tlb0 + tlb1;
--
2.14.1