[PATCH 6.1 167/473] m68k: mac: Fix reboot hang on Mac IIci

Greg Kroah-Hartman
2024-06-06T14:14:51Z

From: Finn Thain <fthain@linux-m68k.org>

[ Upstream commit 265a3b322df9a973ff1fc63da70af456ab6ae1d6 ]

Calling mac_reset() on a Mac IIci does reset the system, but what
follows is a POST failure that requires a manual reset to resolve.
Avoid that by using the 68030 asm implementation instead of the C
implementation.

Apparently the SE/30 has a similar problem as it has used the asm
implementation since before git. This patch extends that solution to
other systems with a similar ROM.

After this patch, the only systems still using the C implementation are
68040 systems where adb_type is either MAC_ADB_IOP or MAC_ADB_II. This
implies a 1 MiB Quadra ROM.

This now includes the Quadra 900/950, which previously fell through to
the "should never get here" catch-all.

Reported-and-tested-by: Stan Johnson <userm57@yahoo.com>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/480ebd1249d229c6dc1f3f1c6d599b8505483fd8.1714797072.git.fthain@linux-m68k.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/m68k/mac/misc.c | 36 ++++++++++++++++++------------------
1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/arch/m68k/mac/misc.c b/arch/m68k/mac/misc.c
index 4fab347917586..060394b00037d 100644
--- a/arch/m68k/mac/misc.c
+++ b/arch/m68k/mac/misc.c
@@ -451,30 +451,18 @@ void mac_poweroff(void)

void mac_reset(void)
{
- if (macintosh_config->adb_type == MAC_ADB_II &&
- macintosh_config->ident != MAC_MODEL_SE30) {
- /* need ROMBASE in booter */
- /* indeed, plus need to MAP THE ROM !! */
-
- if (mac_bi_data.rombase == 0)
- mac_bi_data.rombase = 0x40800000;
-
- /* works on some */
- rom_reset = (void *) (mac_bi_data.rombase + 0xa);
-
- local_irq_disable();
- rom_reset();
#ifdef CONFIG_ADB_CUDA
- } else if (macintosh_config->adb_type == MAC_ADB_EGRET ||
- macintosh_config->adb_type == MAC_ADB_CUDA) {
+ if (macintosh_config->adb_type == MAC_ADB_EGRET ||
+ macintosh_config->adb_type == MAC_ADB_CUDA) {
cuda_restart();
+ } else
#endif
#ifdef CONFIG_ADB_PMU
- } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
+ if (macintosh_config->adb_type == MAC_ADB_PB2) {
pmu_restart();
+ } else
#endif
- } else if (CPU_IS_030) {
-
+ if (CPU_IS_030) {
/* 030-specific reset routine. The idea is general, but the
* specific registers to reset are '030-specific. Until I
* have a non-030 machine, I can't test anything else.
@@ -522,6 +510,18 @@ void mac_reset(void)
"jmp %/a0@\n\t" /* jump to the reset vector */
".chip 68k"
: : "r" (offset), "a" (rombase) : "a0");
+ } else {
+ /* need ROMBASE in booter */
+ /* indeed, plus need to MAP THE ROM !! */
+
+ if (mac_bi_data.rombase == 0)
+ mac_bi_data.rombase = 0x40800000;
+
+ /* works on some */
+ rom_reset = (void *)(mac_bi_data.rombase + 0xa);
+
+ local_irq_disable();
+ rom_reset();
}

/* should never get here */
--
2.43.0