+#ifdef CONFIG_TUNE_PIO
+ /* Mode 0 - 2 only, are directly determined by word 51. */
+ pio_mode = iop->tPIO;
+ if (pio_mode > 2) {
+ printf("WARNING: Invalid PIO (word 51 = %d).\n", pio_mode);
+ pio_mode = 0; /* Force it to dead slow, and hope for the best... */
+ }
+
+ /* Any CompactFlash Storage Card that supports PIO mode 3 or above
+ * shall set bit 1 of word 53 to one and support the fields contained
+ * in words 64 through 70.
+ */
+ if (iop->field_valid & 0x02) {
+ /* Mode 3 and above are possible. Check in order from slow
+ * to fast, so we wind up with the highest mode allowed.
+ */
+ if (iop->eide_pio_modes & 0x01)
+ pio_mode = 3;
+ if (iop->eide_pio_modes & 0x02)
+ pio_mode = 4;
+ if (ata_id_is_cfa((u16 *)iop)) {
+ if ((iop->cf_advanced_caps & 0x07) == 0x01)
+ pio_mode = 5;
+ if ((iop->cf_advanced_caps & 0x07) == 0x02)
+ pio_mode = 6;
+ }
+ }
+
+ /* System-specific, depends on bus speeds, etc. */
+ ide_set_piomode(pio_mode);
+#endif /* CONFIG_TUNE_PIO */
+