Add ide-timing functionality to libata.

This is needed for full AMD and VIA drivers and possibly more. Functions
to turn actual clocking and cycle timings into register values. Also to
merge shared timings to compute an optimal timing set.

Built from the drivers/ide version by Vojtech Pavlik

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 0261c55f3483..0e214f8c8f9f 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -388,6 +388,19 @@ struct ata_port_info {
         struct ata_port_operations      *port_ops;
 };
 
+struct ata_timing {
+        unsigned short mode;            /* ATA mode */
+        unsigned short setup;           /* t1 */
+        unsigned short act8b;           /* t2 for 8-bit I/O */
+        unsigned short rec8b;           /* t2i for 8-bit I/O */
+        unsigned short cyc8b;           /* t0 for 8-bit I/O */
+        unsigned short active;          /* t2 or tD */
+        unsigned short recover;         /* t2i or tK */
+        unsigned short cycle;           /* t0 */
+        unsigned short udma;            /* t2CYCTYP/2 */
+};
+
+#define FIT(v,vmin,vmax)        max_t(short,min_t(short,v,vmax),vmin)
 
 extern void ata_port_probe(struct ata_port *);
 extern void __sata_phy_reset(struct ata_port *ap);
@@ -451,6 +464,32 @@ extern int ata_std_bios_param(struct scsi_device *sdev,
                               sector_t capacity, int geom[]);
 extern int ata_scsi_slave_config(struct scsi_device *sdev);
 
+/*
+ * Timing helpers
+ */
+extern int ata_timing_compute(struct ata_device *, unsigned short,
+                              struct ata_timing *, int, int);
+extern void ata_timing_merge(const struct ata_timing *,
+                             const struct ata_timing *, struct ata_timing *,
+                             unsigned int);
+
+enum {
+        ATA_TIMING_SETUP        = (1 << 0),
+        ATA_TIMING_ACT8B        = (1 << 1),
+        ATA_TIMING_REC8B        = (1 << 2),
+        ATA_TIMING_CYC8B        = (1 << 3),
+        ATA_TIMING_8BIT         = ATA_TIMING_ACT8B | ATA_TIMING_REC8B |
+                                  ATA_TIMING_CYC8B,
+        ATA_TIMING_ACTIVE       = (1 << 4),
+        ATA_TIMING_RECOVER      = (1 << 5),
+        ATA_TIMING_CYCLE        = (1 << 6),
+        ATA_TIMING_UDMA         = (1 << 7),
+        ATA_TIMING_ALL          = ATA_TIMING_SETUP | ATA_TIMING_ACT8B |
+                                  ATA_TIMING_REC8B | ATA_TIMING_CYC8B |
+                                  ATA_TIMING_ACTIVE | ATA_TIMING_RECOVER |
+                                  ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
+};
+
 
 #ifdef CONFIG_PCI
 struct pci_bits {