m68k updates for v6.13

- Revive SCSI and early console support on MVME147,
   - Fix early kernel parameters using static keys,
   - Prevent and improve handling of kernel configurations that lack
     specific platform, CPU, or MMU support, to avoid build failures,
   - Miscellaneous fixes and improvements,
   - Defconfig updates.
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Merge tag 'm68k-for-v6.13-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k

Pull m68k updates from Geert Uytterhoeven:

 - Revive SCSI and early console support on MVME147

 - Fix early kernel parameters using static keys

 - Prevent and improve handling of kernel configurations that lack
   specific platform, CPU, or MMU support, to avoid build failures

 - Miscellaneous fixes and improvements

 - Defconfig updates

* tag 'm68k-for-v6.13-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
  m68k: defconfig: Update defconfigs for v6.12-rc1
  m68k: mvme147: Reinstate early console
  m68k: Make sure NR_IRQS is never zero
  m68k: Select M68020 as fallback for classic
  m68k: Move Sun 3 into a top-level platform option
  m68k: kernel: Use str_read_write() helper function
  m68k: Initialize jump labels early during setup_arch()
  m68k: mvme147: Fix SCSI controller IRQ numbers
  m68k: mvme147: Make mvme147_sched_init() __init

arch/m68k/Kconfig

@@ -84,24 +84,23 @@ config MMU
 	  support by paged memory management. If unsure, say 'Y'.
 
 config MMU_MOTOROLA
-	bool
+	def_bool MMU && M68KCLASSIC
 	select HAVE_PAGE_SIZE_4KB
 
 config MMU_COLDFIRE
+	def_bool MMU && COLDFIRE
 	select HAVE_PAGE_SIZE_8KB
-	bool
 
 config MMU_SUN3
-	bool
+	def_bool MMU && SUN3
 	select HAVE_PAGE_SIZE_8KB
-	depends on MMU && !MMU_MOTOROLA && !MMU_COLDFIRE
 
 config ARCH_SUPPORTS_KEXEC
-	def_bool M68KCLASSIC && MMU
+	def_bool (M68KCLASSIC || SUN3) && MMU
 
 config BOOTINFO_PROC
 	bool "Export bootinfo in procfs"
-	depends on KEXEC && M68KCLASSIC
+	depends on KEXEC && (M68KCLASSIC || SUN3)
 	help
 	  Say Y to export the bootinfo used to boot the kernel in a
 	  "bootinfo" file in procfs.  This is useful with kexec.

arch/m68k/Kconfig.cpu

@@ -2,7 +2,7 @@
 comment "Processor Type"
 
 choice
-	prompt "CPU family support"
+	prompt "CPU/machine family support"
 	default M68KCLASSIC if MMU
 	default COLDFIRE if !MMU
 	help
@@ -19,8 +19,9 @@ choice
 	  processor, select COLDFIRE.
 
 config M68KCLASSIC
-	bool "Classic M68K CPU family support"
+	bool "Classic M68K CPU/machine family support"
 	select HAVE_ARCH_PFN_VALID
+	select M68020 if MMU && !(M68030 || M68040 || M68060)
 
 config COLDFIRE
 	bool "Coldfire CPU family support"
@@ -32,13 +33,23 @@ config COLDFIRE
 	select HAVE_LEGACY_CLK
 	select HAVE_PAGE_SIZE_8KB if !MMU
 
+config SUN3
+	bool "Sun3 machine support"
+	depends on MMU
+	select HAVE_ARCH_PFN_VALID
+	select LEGACY_TIMER_TICK
+	select NO_DMA
+	select M68020
+	help
+	  This option enables support for the Sun 3 series of workstations
+	  (3/50, 3/60, 3/1xx, 3/2xx systems). These use a classic 68020 CPU
+	  but the custom memory management unit makes them incompatible with
+	  all other classic m68k machines, including Sun 3x.
+
 endchoice
 
-if M68KCLASSIC
-
 config M68000
-	def_bool y
+	def_bool M68KCLASSIC && !MMU
-	depends on !MMU
 	select CPU_HAS_NO_BITFIELDS
 	select CPU_HAS_NO_CAS
 	select CPU_HAS_NO_MULDIV64
@@ -56,7 +67,7 @@ config M68000
 	  a paging MMU.
 
 config M68020
-	bool "68020 support"
+	bool "68020 support" if M68KCLASSIC
 	depends on MMU
 	select FPU
 	select CPU_HAS_ADDRESS_SPACES
@@ -66,9 +77,10 @@ config M68020
 	  68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
 	  Sun 3, which provides its own version.
 
+if M68KCLASSIC && MMU
+
 config M68030
 	bool "68030 support"
-	depends on MMU && !MMU_SUN3
 	select FPU
 	select CPU_HAS_ADDRESS_SPACES
 	help
@@ -78,7 +90,6 @@ config M68030
 
 config M68040
 	bool "68040 support"
-	depends on MMU && !MMU_SUN3
 	select FPU
 	select CPU_HAS_ADDRESS_SPACES
 	help
@@ -89,13 +100,14 @@ config M68040
 
 config M68060
 	bool "68060 support"
-	depends on MMU && !MMU_SUN3
 	select FPU
 	select CPU_HAS_ADDRESS_SPACES
 	help
 	  If you anticipate running this kernel on a computer with a MC68060
 	  processor, say Y. Otherwise, say N.
 
+endif # M68KCLASSIC
+
 config M68328
 	bool
 	depends on !MMU
@@ -117,8 +129,6 @@ config M68VZ328
 	help
 	  Motorola 68VZ328 processor support.
 
-endif # M68KCLASSIC
-
 if COLDFIRE
 
 choice
@@ -325,7 +335,7 @@ comment "Processor Specific Options"
 
 config M68KFPU_EMU
 	bool "Math emulation support"
-	depends on M68KCLASSIC && FPU
+	depends on (M68KCLASSIC || SUN3) && FPU
 	help
 	  At some point in the future, this will cause floating-point math
 	  instructions to be emulated by the kernel on machines that lack a

arch/m68k/Kconfig.machine

@@ -6,7 +6,6 @@ if M68KCLASSIC
 config AMIGA
 	bool "Amiga support"
 	depends on MMU
-	select MMU_MOTOROLA if MMU
 	select LEGACY_TIMER_TICK
 	help
 	  This option enables support for the Amiga series of computers. If
@@ -16,7 +15,6 @@ config AMIGA
 config ATARI
 	bool "Atari support"
 	depends on MMU
-	select MMU_MOTOROLA if MMU
 	select HAVE_ARCH_NVRAM_OPS
 	select LEGACY_TIMER_TICK
 	help
@@ -31,7 +29,6 @@ config ATARI_KBD_CORE
 config MAC
 	bool "Macintosh support"
 	depends on MMU
-	select MMU_MOTOROLA if MMU
 	select HAVE_ARCH_NVRAM_OPS
 	select HAVE_PATA_PLATFORM
 	select LEGACY_TIMER_TICK
@@ -44,7 +41,6 @@ config MAC
 config APOLLO
 	bool "Apollo support"
 	depends on MMU
-	select MMU_MOTOROLA if MMU
 	select LEGACY_TIMER_TICK
 	help
 	  Say Y here if you want to run Linux on an MC680x0-based Apollo
@@ -53,7 +49,6 @@ config APOLLO
 config VME
 	bool "VME (Motorola and BVM) support"
 	depends on MMU
-	select MMU_MOTOROLA if MMU
 	help
 	  Say Y here if you want to build a kernel for a 680x0 based VME
 	  board.  Boards currently supported include Motorola boards MVME147,
@@ -97,7 +92,6 @@ config BVME6000
 config HP300
 	bool "HP9000/300 and HP9000/400 support"
 	depends on MMU
-	select MMU_MOTOROLA if MMU
 	select LEGACY_TIMER_TICK
 	help
 	  This option enables support for the HP9000/300 and HP9000/400 series
@@ -110,7 +104,6 @@ config SUN3X
 	bool "Sun3x support"
 	depends on MMU
 	select LEGACY_TIMER_TICK
-	select MMU_MOTOROLA if MMU
 	select M68030
 	help
 	  This option enables support for the Sun 3x series of workstations.
@@ -124,7 +117,6 @@ config SUN3X
 config Q40
 	bool "Q40/Q60 support"
 	depends on MMU
-	select MMU_MOTOROLA if MMU
 	select LEGACY_TIMER_TICK
 	help
 	  The Q40 is a Motorola 68040-based successor to the Sinclair QL
@@ -133,22 +125,6 @@ config Q40
 	  Q60. Select your CPU below.  For 68LC060 don't forget to enable FPU
 	  emulation.
 
-config SUN3
-	bool "Sun3 support"
-	depends on MMU
-	depends on !MMU_MOTOROLA
-	select MMU_SUN3 if MMU
-	select LEGACY_TIMER_TICK
-	select NO_DMA
-	select M68020
-	help
-	  This option enables support for the Sun 3 series of workstations
-	  (3/50, 3/60, 3/1xx, 3/2xx systems). Enabling this option requires
-	  that all other hardware types must be disabled, as Sun 3 kernels
-	  are incompatible with all other m68k targets (including Sun 3x!).
-
-	  If you don't want to compile a kernel exclusively for a Sun 3, say N.
-
 config VIRT
 	bool "Virtual M68k Machine support"
 	depends on MMU
@@ -157,7 +133,6 @@ config VIRT
 	select GOLDFISH_TIMER
 	select GOLDFISH_TTY
 	select M68040
-	select MMU_MOTOROLA if MMU
 	select RTC_CLASS
 	select RTC_DRV_GOLDFISH
 	select TTY

arch/m68k/configs/amiga_defconfig

@@ -620,6 +620,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/configs/apollo_defconfig

@@ -577,6 +577,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/configs/atari_defconfig

@@ -597,6 +597,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/configs/bvme6000_defconfig

@@ -569,6 +569,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/configs/hp300_defconfig

@@ -579,6 +579,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/configs/mac_defconfig

@@ -596,6 +596,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/configs/multi_defconfig

@@ -682,6 +682,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/configs/mvme147_defconfig

@@ -568,6 +568,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/configs/mvme16x_defconfig

@@ -569,6 +569,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/configs/q40_defconfig

@@ -586,6 +586,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/configs/sun3_defconfig

@@ -566,6 +566,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/configs/sun3x_defconfig

@@ -567,6 +567,7 @@ CONFIG_KUNIT_ALL_TESTS=m
 CONFIG_TEST_DHRY=m
 CONFIG_TEST_MIN_HEAP=m
 CONFIG_TEST_DIV64=m
+CONFIG_TEST_MULDIV64=m
 CONFIG_REED_SOLOMON_TEST=m
 CONFIG_ATOMIC64_SELFTEST=m
 CONFIG_ASYNC_RAID6_TEST=m

arch/m68k/include/asm/irq.h

@@ -28,10 +28,8 @@
 #define NR_IRQS	32
 #elif defined(CONFIG_APOLLO)
 #define NR_IRQS	24
-#elif defined(CONFIG_HP300)
+#else /* CONFIG_HP300 etc. */
 #define NR_IRQS	8
-#else
-#define NR_IRQS	0
 #endif
 
 #if defined(CONFIG_M68020) || defined(CONFIG_M68030) || \

arch/m68k/include/asm/mvme147hw.h

@@ -93,8 +93,8 @@ struct pcc_regs {
 #define M147_SCC_B_ADDR		0xfffe3000
 #define M147_SCC_PCLK		5000000
 
-#define MVME147_IRQ_SCSI_PORT	(IRQ_USER+0x45)
+#define MVME147_IRQ_SCSI_PORT	(IRQ_USER + 5)
-#define MVME147_IRQ_SCSI_DMA	(IRQ_USER+0x46)
+#define MVME147_IRQ_SCSI_DMA	(IRQ_USER + 6)
 
 /* SCC interrupts, for MVME147 */
 

arch/m68k/kernel/Makefile

@@ -5,16 +5,8 @@
 
 extra-y			+= vmlinux.lds
 
-obj-$(CONFIG_AMIGA)	:= head.o
+obj-$(CONFIG_MMU_MOTOROLA)	:= head.o
-obj-$(CONFIG_ATARI)	:= head.o
+obj-$(CONFIG_SUN3)		:= sun3-head.o
-obj-$(CONFIG_MAC)	:= head.o
-obj-$(CONFIG_APOLLO)	:= head.o
-obj-$(CONFIG_VME)	:= head.o
-obj-$(CONFIG_HP300)	:= head.o
-obj-$(CONFIG_Q40)	:= head.o
-obj-$(CONFIG_SUN3X)	:= head.o
-obj-$(CONFIG_VIRT)	:= head.o
-obj-$(CONFIG_SUN3)	:= sun3-head.o
 
 obj-y	+= entry.o irq.o module.o process.o ptrace.o
 obj-y	+= setup.o signal.o sys_m68k.o syscalltable.o time.o traps.o

arch/m68k/kernel/early_printk.c

@@ -13,6 +13,7 @@
 #include <asm/setup.h>
 
 
+#include "../mvme147/mvme147.h"
 #include "../mvme16x/mvme16x.h"
 
 asmlinkage void __init debug_cons_nputs(const char *s, unsigned n);
@@ -22,7 +23,9 @@ static void __ref debug_cons_write(struct console *c,
 {
 #if !(defined(CONFIG_SUN3) || defined(CONFIG_M68000) || \
       defined(CONFIG_COLDFIRE))
-	if (MACH_IS_MVME16x)
+	if (MACH_IS_MVME147)
+		mvme147_scc_write(c, s, n);
+	else if (MACH_IS_MVME16x)
 		mvme16x_cons_write(c, s, n);
 	else
 		debug_cons_nputs(s, n);

arch/m68k/kernel/setup_mm.c

@@ -249,7 +249,11 @@ void __init setup_arch(char **cmdline_p)
 	process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
 	*cmdline_p = m68k_command_line;
 	memcpy(boot_command_line, *cmdline_p, CL_SIZE);
-
+	/*
+	 * Initialise the static keys early as they may be enabled by the
+	 * cpufeature code and early parameters.
+	 */
+	jump_label_init();
 	parse_early_param();
 
 	switch (m68k_machtype) {

arch/m68k/kernel/time.c

@@ -62,7 +62,7 @@ void timer_heartbeat(void)
 }
 #endif /* CONFIG_HEARTBEAT */
 
-#ifdef CONFIG_M68KCLASSIC
+#if defined(CONFIG_M68KCLASSIC) || defined(CONFIG_SUN3)
 /* machine dependent timer functions */
 int (*mach_hwclk) (int, struct rtc_time*);
 EXPORT_SYMBOL(mach_hwclk);
@@ -149,7 +149,7 @@ static int __init rtc_init(void)
 
 module_init(rtc_init);
 #endif /* CONFIG_RTC_DRV_GENERIC */
-#endif /* CONFIG M68KCLASSIC */
+#endif /* CONFIG_M68KCLASSIC || SUN3 */
 
 void __init time_init(void)
 {

arch/m68k/kernel/traps.c

@@ -383,7 +383,7 @@ static inline void bus_error030 (struct frame *fp)
 			fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 	if (ssw & DF)
 		pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n",
-			ssw & RW ? "read" : "write",
+			str_read_write(ssw & RW),
 			fp->un.fmtb.daddr,
 			space_names[ssw & DFC], fp->ptregs.pc);
 
@@ -419,7 +419,7 @@ static inline void bus_error030 (struct frame *fp)
 				}
 
 				pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
-					ssw & RW ? "read" : "write",
+					str_read_write(ssw & RW),
 					fp->un.fmtb.daddr,
 					space_names[ssw & DFC], fp->ptregs.pc);
 			}
@@ -455,7 +455,7 @@ static inline void bus_error030 (struct frame *fp)
 			pr_debug("*** unexpected busfault type=%#04x\n",
 				 buserr_type);
 			pr_debug("invalid %s access at %#lx from pc %#lx\n",
-				 !(ssw & RW) ? "write" : "read", addr,
+				 str_read_write(ssw & RW), addr,
 				 fp->ptregs.pc);
 			die_if_kernel ("Oops", &fp->ptregs, buserr_type);
 			force_sig (SIGBUS);
@@ -514,7 +514,7 @@ static inline void bus_error030 (struct frame *fp)
 			fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 	if (ssw & DF)
 		pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n",
-			ssw & RW ? "read" : "write",
+			str_read_write(ssw & RW),
 			fp->un.fmtb.daddr,
 			space_names[ssw & DFC], fp->ptregs.pc);
 
@@ -548,7 +548,7 @@ static inline void bus_error030 (struct frame *fp)
 			/* We might have an exception table for this PC */
 			if (ssw & 4 && !search_exception_tables(fp->ptregs.pc)) {
 				pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
-				       ssw & RW ? "read" : "write",
+				       str_read_write(ssw & RW),
 				       fp->un.fmtb.daddr,
 				       space_names[ssw & DFC], fp->ptregs.pc);
 				goto buserr;
@@ -564,7 +564,7 @@ static inline void bus_error030 (struct frame *fp)
 				       mmusr);
 		} else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
 			pr_err("invalid %s access at %#lx from pc %#lx\n",
-			       !(ssw & RW) ? "write" : "read", addr,
+			       str_read_write(ssw & RW), addr,
 			       fp->ptregs.pc);
 			die_if_kernel("Oops",&fp->ptregs,mmusr);
 			force_sig(SIGSEGV);
@@ -575,7 +575,7 @@ static inline void bus_error030 (struct frame *fp)
 #endif
 
 			pr_err("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
-			       !(ssw & RW) ? "write" : "read", addr,
+			       str_read_write(ssw & RW), addr,
 			       fp->ptregs.pc, ssw);
 			asm volatile ("ptestr #1,%1@,#0\n\t"
 				      "pmove %%psr,%0"
@@ -991,7 +991,7 @@ static void bad_super_trap(struct frame *fp)
 				fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
 		if (ssw & DF)
 			pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
-				ssw & RW ? "read" : "write",
+				str_read_write(ssw & RW),
 				fp->un.fmtb.daddr, space_names[ssw & DFC],
 				fp->ptregs.pc);
 	}

arch/m68k/mvme147/config.c

@@ -32,9 +32,10 @@
 #include <asm/mvme147hw.h>
 #include <asm/config.h>
 
+#include "mvme147.h"
 
 static void mvme147_get_model(char *model);
-extern void mvme147_sched_init(void);
+static void __init mvme147_sched_init(void);
 extern int mvme147_hwclk (int, struct rtc_time *);
 extern void mvme147_reset (void);
 
@@ -123,7 +124,7 @@ static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
 }
 
 
-void mvme147_sched_init (void)
+static void __init mvme147_sched_init(void)
 {
 	if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
 			"timer 1", NULL))
@@ -185,3 +186,32 @@ int mvme147_hwclk(int op, struct rtc_time *t)
 	}
 	return 0;
 }
+
+static void scc_delay(void)
+{
+	__asm__ __volatile__ ("nop; nop;");
+}
+
+static void scc_write(char ch)
+{
+	do {
+		scc_delay();
+	} while (!(in_8(M147_SCC_A_ADDR) & BIT(2)));
+	scc_delay();
+	out_8(M147_SCC_A_ADDR, 8);
+	scc_delay();
+	out_8(M147_SCC_A_ADDR, ch);
+}
+
+void mvme147_scc_write(struct console *co, const char *str, unsigned int count)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	while (count--)	{
+		if (*str == '\n')
+			scc_write('\r');
+		scc_write(*str++);
+	}
+	local_irq_restore(flags);
+}

arch/m68k/mvme147/mvme147.h

@@ -0,0 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+struct console;
+
+/* config.c */
+void mvme147_scc_write(struct console *co, const char *str, unsigned int count);