Messages in this thread Patch in this message | | | From | Finn Thain <> | Subject | [PATCH 04/12] m68k/mac: Place ISM IOP in bypass mode | Date | Sat, 31 Mar 2018 21:41:04 -0400 (EDT) |
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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@redhat.com> Tested-by: Stan Johnson <userm57@yahoo.com> Signed-off-by: Finn Thain <fthain@telegraphics.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
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