[SCSI] aic7xxx: remove aiclib.c

[safe/jmp/linux-2.6] / drivers / scsi / aic7xxx / aic7xxx_proc.c

diff --git a/drivers/scsi/aic7xxx/aic7xxx_proc.c b/drivers/scsi/aic7xxx/aic7xxx_proc.c
index 3802c91..04a3506 100644 (file)
--- a/drivers/scsi/aic7xxx/aic7xxx_proc.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_proc.c
@@ -54,6 +54,49 @@ static void  ahc_dump_device_state(struct info_str *info,
 static int     ahc_proc_write_seeprom(struct ahc_softc *ahc,
                                       char *buffer, int length);
 
+/*
+ * Table of syncrates that don't follow the "divisible by 4"
+ * rule. This table will be expanded in future SCSI specs.
+ */
+static struct {
+       u_int period_factor;
+       u_int period;   /* in 100ths of ns */
+} scsi_syncrates[] = {
+       { 0x08, 625 },  /* FAST-160 */
+       { 0x09, 1250 }, /* FAST-80 */
+       { 0x0a, 2500 }, /* FAST-40 40MHz */
+       { 0x0b, 3030 }, /* FAST-40 33MHz */
+       { 0x0c, 5000 }  /* FAST-20 */
+};
+
+/*
+ * Return the frequency in kHz corresponding to the given
+ * sync period factor.
+ */
+static u_int
+ahc_calc_syncsrate(u_int period_factor)
+{
+       int i;
+       int num_syncrates;
+
+       num_syncrates = sizeof(scsi_syncrates) / sizeof(scsi_syncrates[0]);
+       /* See if the period is in the "exception" table */
+       for (i = 0; i < num_syncrates; i++) {
+
+               if (period_factor == scsi_syncrates[i].period_factor) {
+                       /* Period in kHz */
+                       return (100000000 / scsi_syncrates[i].period);
+               }
+       }
+
+       /*
+        * Wasn't in the table, so use the standard
+        * 4 times conversion.
+        */
+       return (10000000 / (period_factor * 4 * 10));
+}
+
+
 static void
 copy_mem_info(struct info_str *info, char *data, int len)
 {
@@ -106,7 +149,7 @@ ahc_format_transinfo(struct info_str *info, struct ahc_transinfo *tinfo)
         speed = 3300;
         freq = 0;
        if (tinfo->offset != 0) {
-               freq = aic_calc_syncsrate(tinfo->period);
+               freq = ahc_calc_syncsrate(tinfo->period);
                speed = freq;
        }
        speed *= (0x01 << tinfo->width);