ata: start separating SATA specific code from libata-core.c

Start separating SATA specific code from libata-core.c:

* move following functions to libata-sata.c:
  - ata_tf_to_fis()
  - ata_tf_from_fis()
  - sata_link_scr_lpm()
  - ata_slave_link_init()
  - sata_lpm_ignore_phy_events()

* group above functions together in <linux/libata.h>

* include libata-sata.c in the build when CONFIG_SATA_HOST=y

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  37582     572      40   38194    9532 drivers/ata/libata-core.o
after:
  36762     572      40   37374    91fe drivers/ata/libata-core.o

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 10 insertions, 6 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 661d76038684..b419d7412f71 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1082,8 +1082,6 @@ extern int sata_link_debounce(struct ata_link *link,
 			const unsigned long *params, unsigned long deadline);
 extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
 			    unsigned long deadline);
-extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
-			     bool spm_wakeup);
 extern int sata_link_hardreset(struct ata_link *link,
 			const unsigned long *timing, unsigned long deadline,
 			bool *online, int (*check_ready)(struct ata_link *));
@@ -1094,7 +1092,6 @@ extern void ata_std_postreset(struct ata_link *link, unsigned int *classes);
 extern struct ata_host *ata_host_alloc(struct device *dev, int max_ports);
 extern struct ata_host *ata_host_alloc_pinfo(struct device *dev,
 			const struct ata_port_info * const * ppi, int n_ports);
-extern int ata_slave_link_init(struct ata_port *ap);
 extern void ata_host_get(struct ata_host *host);
 extern void ata_host_put(struct ata_host *host);
 extern int ata_host_start(struct ata_host *host);
@@ -1152,9 +1149,6 @@ extern void ata_msleep(struct ata_port *ap, unsigned int msecs);
 extern u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask,
 			u32 val, unsigned long interval, unsigned long timeout);
 extern int atapi_cmd_type(u8 opcode);
-extern void ata_tf_to_fis(const struct ata_taskfile *tf,
-			  u8 pmp, int is_cmd, u8 *fis);
-extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
 extern unsigned long ata_pack_xfermask(unsigned long pio_mask,
 			unsigned long mwdma_mask, unsigned long udma_mask);
 extern void ata_unpack_xfermask(unsigned long xfer_mask,
@@ -1195,6 +1189,16 @@ extern struct ata_device *ata_dev_pair(struct ata_device *adev);
 extern int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev);
 extern void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap);
 extern void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap, struct list_head *eh_q);
+
+/*
+ * SATA specific code - drivers/ata/libata-sata.c
+ */
+extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
+			     bool spm_wakeup);
+extern int ata_slave_link_init(struct ata_port *ap);
+extern void ata_tf_to_fis(const struct ata_taskfile *tf,
+			  u8 pmp, int is_cmd, u8 *fis);
+extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
 extern bool sata_lpm_ignore_phy_events(struct ata_link *link);
 
 extern int ata_cable_40wire(struct ata_port *ap);