linux-kernel - [PATCH 04/12] m68k/mac: Place ISM IOP in bypass mode

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Message-Id: <8b6687388074cd4be70b625f874292cd062e0b04.1522546571.git.fthain@telegraphics.com.au>
Date:   Sat, 31 Mar 2018 21:41:04 -0400 (EDT)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Laurent Vivier <lvivier@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: [PATCH 04/12] m68k/mac: Place ISM IOP in bypass mode

Some Mac models have an IOP for offloading floppy disk IO. Linux once
had a driver for that but it got removed in commit b21a323710e7
("[PATCH] remove the broken BLK_DEV_SWIM_IOP driver").

Put the ISM IOP into bypass mode so that the existing 'swim_mod' driver
can access the controller directly. Use the appropriate macros for the
flag bits.

Cc: Laurent Vivier <lvivier@...hat.com>
Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
---
 arch/m68k/mac/iop.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/m68k/mac/iop.c b/arch/m68k/mac/iop.c
index 9bfa17015768..7864dcca5891 100644
--- a/arch/m68k/mac/iop.c
+++ b/arch/m68k/mac/iop.c
@@ -234,6 +234,7 @@ static struct iop_msg *iop_get_unused_msg(void)
  * is to find and initialize the IOPs early in the boot sequence, so that
  * the serial IOP can be placed into bypass mode _before_ we try to
  * initialize the serial console.
+ * The ISM IOP is put into bypass mode for compatibility with the swim driver.
  */
 
 void __init iop_preinit(void)
@@ -244,7 +245,8 @@ void __init iop_preinit(void)
 		} else {
 			iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_QUADRA;
 		}
-		iop_base[IOP_NUM_SCC]->status_ctrl = 0x87;
+		iop_base[IOP_NUM_SCC]->status_ctrl = IOP_BYPASS | IOP_AUTOINC |
+						     IOP_RUN | IOP_DMAINACTIVE;
 		iop_scc_present = 1;
 	} else {
 		iop_base[IOP_NUM_SCC] = NULL;
@@ -256,7 +258,8 @@ void __init iop_preinit(void)
 		} else {
 			iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_QUADRA;
 		}
-		iop_base[IOP_NUM_ISM]->status_ctrl = 0;
+		iop_base[IOP_NUM_ISM]->status_ctrl = IOP_BYPASS | IOP_AUTOINC |
+						     IOP_RUN | IOP_DMAINACTIVE;
 		iop_ism_present = 1;
 	} else {
 		iop_base[IOP_NUM_ISM] = NULL;
-- 
2.16.1