libata: reorganize ata_port_operations

Over the time, ops in ata_port_operations has become a bit confusing.
Reorganize.  SFF/BMDMA ops are separated into separate a group as they
will be taken out of ata_port_operations later.

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 61 insertions, 56 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index bc60132c7d33..9476a479691b 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -665,69 +665,74 @@ struct ata_port {
 };
 
 struct ata_port_operations {
-        void (*dev_config) (struct ata_device *);
+        /*
+         * Command execution
+         */
+        int  (*qc_defer)(struct ata_queued_cmd *qc);
+        int  (*check_atapi_dma)(struct ata_queued_cmd *qc);
+        void (*qc_prep)(struct ata_queued_cmd *qc);
+        unsigned int (*qc_issue)(struct ata_queued_cmd *qc);
 
-        void (*set_piomode) (struct ata_port *, struct ata_device *);
-        void (*set_dmamode) (struct ata_port *, struct ata_device *);
-        unsigned long (*mode_filter) (struct ata_device *, unsigned long);
+        /*
+         * Configuration and exception handling
+         */
+        int  (*cable_detect)(struct ata_port *ap);
+        unsigned long (*mode_filter)(struct ata_device *dev, unsigned long xfer_mask);
+        void (*set_piomode)(struct ata_port *ap, struct ata_device *dev);
+        void (*set_dmamode)(struct ata_port *ap, struct ata_device *dev);
+        int  (*set_mode)(struct ata_link *link, struct ata_device **r_failed_dev);
 
-        void (*tf_load) (struct ata_port *ap, const struct ata_taskfile *tf);
-        void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
+        void (*dev_config)(struct ata_device *dev);
 
-        void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
+        void (*freeze)(struct ata_port *ap);
+        void (*thaw)(struct ata_port *ap);
+        void (*error_handler)(struct ata_port *ap);
+        void (*post_internal_cmd)(struct ata_queued_cmd *qc);
+
+        /*
+         * Optional features
+         */
+        int  (*scr_read)(struct ata_port *ap, unsigned int sc_reg, u32 *val);
+        int  (*scr_write)(struct ata_port *ap, unsigned int sc_reg, u32 val);
+        void (*pmp_attach)(struct ata_port *ap);
+        void (*pmp_detach)(struct ata_port *ap);
+        int  (*enable_pm)(struct ata_port *ap, enum link_pm policy);
+        void (*disable_pm)(struct ata_port *ap);
+
+        /*
+         * Start, stop, suspend and resume
+         */
+        int  (*port_suspend)(struct ata_port *ap, pm_message_t mesg);
+        int  (*port_resume)(struct ata_port *ap);
+        int  (*port_start)(struct ata_port *ap);
+        void (*port_stop)(struct ata_port *ap);
+        void (*host_stop)(struct ata_host *host);
+
+        /*
+         * SFF / taskfile oriented ops
+         */
+        void (*dev_select)(struct ata_port *ap, unsigned int device);
         u8   (*check_status)(struct ata_port *ap);
         u8   (*check_altstatus)(struct ata_port *ap);
-        void (*dev_select)(struct ata_port *ap, unsigned int device);
-
-        void (*phy_reset) (struct ata_port *ap); /* obsolete */
-        int  (*set_mode) (struct ata_link *link, struct ata_device **r_failed_dev);
-
-        int (*cable_detect) (struct ata_port *ap);
-
-        int  (*check_atapi_dma) (struct ata_queued_cmd *qc);
-
-        void (*bmdma_setup) (struct ata_queued_cmd *qc);
-        void (*bmdma_start) (struct ata_queued_cmd *qc);
-
-        unsigned int (*data_xfer) (struct ata_device *dev, unsigned char *buf,
-                                   unsigned int buflen, int rw);
-
-        int (*qc_defer) (struct ata_queued_cmd *qc);
-        void (*qc_prep) (struct ata_queued_cmd *qc);
-        unsigned int (*qc_issue) (struct ata_queued_cmd *qc);
-
-        /* port multiplier */
-        void (*pmp_attach) (struct ata_port *ap);
-        void (*pmp_detach) (struct ata_port *ap);
-
-        /* Error handlers.  ->error_handler overrides ->eng_timeout and
-         * indicates that new-style EH is in place.
+        void (*tf_load)(struct ata_port *ap, const struct ata_taskfile *tf);
+        void (*tf_read)(struct ata_port *ap, struct ata_taskfile *tf);
+        void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
+        unsigned int (*data_xfer)(struct ata_device *dev, unsigned char *buf,
+                                  unsigned int buflen, int rw);
+        u8   (*irq_on)(struct ata_port *);
+
+        void (*irq_clear)(struct ata_port *);
+        void (*bmdma_setup)(struct ata_queued_cmd *qc);
+        void (*bmdma_start)(struct ata_queued_cmd *qc);
+        void (*bmdma_stop)(struct ata_queued_cmd *qc);
+        u8   (*bmdma_status)(struct ata_port *ap);
+
+        /*
+         * Obsolete
          */
-        void (*eng_timeout) (struct ata_port *ap); /* obsolete */
-
-        void (*freeze) (struct ata_port *ap);
-        void (*thaw) (struct ata_port *ap);
-        void (*error_handler) (struct ata_port *ap);
-        void (*post_internal_cmd) (struct ata_queued_cmd *qc);
-
+        void (*phy_reset)(struct ata_port *ap);
+        void (*eng_timeout)(struct ata_port *ap);
         irq_handler_t irq_handler;
-        void (*irq_clear) (struct ata_port *);
-        u8 (*irq_on) (struct ata_port *);
-
-        int (*scr_read) (struct ata_port *ap, unsigned int sc_reg, u32 *val);
-        int (*scr_write) (struct ata_port *ap, unsigned int sc_reg, u32 val);
-
-        int (*port_suspend) (struct ata_port *ap, pm_message_t mesg);
-        int (*port_resume) (struct ata_port *ap);
-        int (*enable_pm) (struct ata_port *ap, enum link_pm policy);
-        void (*disable_pm) (struct ata_port *ap);
-        int (*port_start) (struct ata_port *ap);
-        void (*port_stop) (struct ata_port *ap);
-
-        void (*host_stop) (struct ata_host *host);
-
-        void (*bmdma_stop) (struct ata_queued_cmd *qc);
-        u8   (*bmdma_status) (struct ata_port *ap);
 };
 
 struct ata_port_info {