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authorGeert Uytterhoeven <geert@linux-m68k.org>2009-05-17 20:44:16 +0200
committerGeert Uytterhoeven <geert@linux-m68k.org>2010-05-26 19:51:07 +0200
commit11ca46eaf207e2fde20f6207b6a3ae7b6295da07 (patch)
treed0574232ea58e5a68624ff8725594d82518c5f54 /drivers/scsi
parenta8169e6057e9b7dd41c9e3b7a41efebc4bd859c9 (diff)
downloadlinux-2.6.34-ux500-11ca46eaf207e2fde20f6207b6a3ae7b6295da07.tar.gz
m68k/scsi: gvp11 - Extract check_wd33c93()
Acked-by: James Bottomley <James.Bottomley@suse.de> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/gvp11.c160
1 files changed, 83 insertions, 77 deletions
diff --git a/drivers/scsi/gvp11.c b/drivers/scsi/gvp11.c
index 777972e6bbf..59a7bff53e1 100644
--- a/drivers/scsi/gvp11.c
+++ b/drivers/scsi/gvp11.c
@@ -22,6 +22,8 @@
#include <linux/stat.h>
+#define CHECK_WD33C93
+
static irqreturn_t gvp11_intr(int irq, void *data)
{
struct Scsi_Host *instance = data;
@@ -167,7 +169,85 @@ static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
}
}
-#define CHECK_WD33C93
+static int __init check_wd33c93(gvp11_scsiregs *regs)
+{
+#ifdef CHECK_WD33C93
+ volatile unsigned char *sasr_3393, *scmd_3393;
+ unsigned char save_sasr;
+ unsigned char q, qq;
+
+ /*
+ * These darn GVP boards are a problem - it can be tough to tell
+ * whether or not they include a SCSI controller. This is the
+ * ultimate Yet-Another-GVP-Detection-Hack in that it actually
+ * probes for a WD33c93 chip: If we find one, it's extremely
+ * likely that this card supports SCSI, regardless of Product_
+ * Code, Board_Size, etc.
+ */
+
+ /* Get pointers to the presumed register locations and save contents */
+
+ sasr_3393 = &regs->SASR;
+ scmd_3393 = &regs->SCMD;
+ save_sasr = *sasr_3393;
+
+ /* First test the AuxStatus Reg */
+
+ q = *sasr_3393; /* read it */
+ if (q & 0x08) /* bit 3 should always be clear */
+ return -ENODEV;
+ *sasr_3393 = WD_AUXILIARY_STATUS; /* setup indirect address */
+ if (*sasr_3393 == WD_AUXILIARY_STATUS) { /* shouldn't retain the write */
+ *sasr_3393 = save_sasr; /* Oops - restore this byte */
+ return -ENODEV;
+ }
+ if (*sasr_3393 != q) { /* should still read the same */
+ *sasr_3393 = save_sasr; /* Oops - restore this byte */
+ return -ENODEV;
+ }
+ if (*scmd_3393 != q) /* and so should the image at 0x1f */
+ return -ENODEV;
+
+ /*
+ * Ok, we probably have a wd33c93, but let's check a few other places
+ * for good measure. Make sure that this works for both 'A and 'B
+ * chip versions.
+ */
+
+ *sasr_3393 = WD_SCSI_STATUS;
+ q = *scmd_3393;
+ *sasr_3393 = WD_SCSI_STATUS;
+ *scmd_3393 = ~q;
+ *sasr_3393 = WD_SCSI_STATUS;
+ qq = *scmd_3393;
+ *sasr_3393 = WD_SCSI_STATUS;
+ *scmd_3393 = q;
+ if (qq != q) /* should be read only */
+ return -ENODEV;
+ *sasr_3393 = 0x1e; /* this register is unimplemented */
+ q = *scmd_3393;
+ *sasr_3393 = 0x1e;
+ *scmd_3393 = ~q;
+ *sasr_3393 = 0x1e;
+ qq = *scmd_3393;
+ *sasr_3393 = 0x1e;
+ *scmd_3393 = q;
+ if (qq != q || qq != 0xff) /* should be read only, all 1's */
+ return -ENODEV;
+ *sasr_3393 = WD_TIMEOUT_PERIOD;
+ q = *scmd_3393;
+ *sasr_3393 = WD_TIMEOUT_PERIOD;
+ *scmd_3393 = ~q;
+ *sasr_3393 = WD_TIMEOUT_PERIOD;
+ qq = *scmd_3393;
+ *sasr_3393 = WD_TIMEOUT_PERIOD;
+ *scmd_3393 = q;
+ if (qq != (~q & 0xff)) /* should be read/write */
+ return -ENODEV;
+#endif /* CHECK_WD33C93 */
+
+ return 0;
+}
int __init gvp11_detect(struct scsi_host_template *tpnt)
{
@@ -181,11 +261,6 @@ int __init gvp11_detect(struct scsi_host_template *tpnt)
gvp11_scsiregs *regs;
wd33c93_regs wdregs;
int num_gvp11 = 0;
-#ifdef CHECK_WD33C93
- volatile unsigned char *sasr_3393, *scmd_3393;
- unsigned char save_sasr;
- unsigned char q, qq;
-#endif
if (!MACH_IS_AMIGA || called)
return 0;
@@ -226,77 +301,9 @@ int __init gvp11_detect(struct scsi_host_template *tpnt)
if (!request_mem_region(address, 256, "wd33c93"))
continue;
-#ifdef CHECK_WD33C93
-
- /*
- * These darn GVP boards are a problem - it can be tough to tell
- * whether or not they include a SCSI controller. This is the
- * ultimate Yet-Another-GVP-Detection-Hack in that it actually
- * probes for a WD33c93 chip: If we find one, it's extremely
- * likely that this card supports SCSI, regardless of Product_
- * Code, Board_Size, etc.
- */
-
- /* Get pointers to the presumed register locations and save contents */
-
- sasr_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SASR);
- scmd_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SCMD);
- save_sasr = *sasr_3393;
-
- /* First test the AuxStatus Reg */
-
- q = *sasr_3393; /* read it */
- if (q & 0x08) /* bit 3 should always be clear */
- goto release;
- *sasr_3393 = WD_AUXILIARY_STATUS; /* setup indirect address */
- if (*sasr_3393 == WD_AUXILIARY_STATUS) { /* shouldn't retain the write */
- *sasr_3393 = save_sasr; /* Oops - restore this byte */
- goto release;
- }
- if (*sasr_3393 != q) { /* should still read the same */
- *sasr_3393 = save_sasr; /* Oops - restore this byte */
- goto release;
- }
- if (*scmd_3393 != q) /* and so should the image at 0x1f */
- goto release;
-
- /*
- * Ok, we probably have a wd33c93, but let's check a few other places
- * for good measure. Make sure that this works for both 'A and 'B
- * chip versions.
- */
-
- *sasr_3393 = WD_SCSI_STATUS;
- q = *scmd_3393;
- *sasr_3393 = WD_SCSI_STATUS;
- *scmd_3393 = ~q;
- *sasr_3393 = WD_SCSI_STATUS;
- qq = *scmd_3393;
- *sasr_3393 = WD_SCSI_STATUS;
- *scmd_3393 = q;
- if (qq != q) /* should be read only */
- goto release;
- *sasr_3393 = 0x1e; /* this register is unimplemented */
- q = *scmd_3393;
- *sasr_3393 = 0x1e;
- *scmd_3393 = ~q;
- *sasr_3393 = 0x1e;
- qq = *scmd_3393;
- *sasr_3393 = 0x1e;
- *scmd_3393 = q;
- if (qq != q || qq != 0xff) /* should be read only, all 1's */
+ regs = (gvp11_scsiregs *)(ZTWO_VADDR(address));
+ if (check_wd33c93(regs))
goto release;
- *sasr_3393 = WD_TIMEOUT_PERIOD;
- q = *scmd_3393;
- *sasr_3393 = WD_TIMEOUT_PERIOD;
- *scmd_3393 = ~q;
- *sasr_3393 = WD_TIMEOUT_PERIOD;
- qq = *scmd_3393;
- *sasr_3393 = WD_TIMEOUT_PERIOD;
- *scmd_3393 = q;
- if (qq != (~q & 0xff)) /* should be read/write */
- goto release;
-#endif
instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
if (instance == NULL)
@@ -311,7 +318,6 @@ int __init gvp11_detect(struct scsi_host_template *tpnt)
else
hdata->dma_xfer_mask = default_dma_xfer_mask;
- regs = (gvp11_scsiregs *)(instance->base);
regs->secret2 = 1;
regs->secret1 = 0;
regs->secret3 = 15;