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authorBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>2020-03-26 18:58:12 +0300
committerJens Axboe <axboe@kernel.dk>2020-03-26 19:28:19 +0300
commit6eab1bc0eecb541f4c383a0823902dc8f5d99861 (patch)
tree1f8cd4aa01eaa38e586e5473adfa372dda459793 /drivers/ata/libata-sata.c
parent7fe183c773c42f9814cd361c45a0233f441bc4fc (diff)
downloadlinux-6eab1bc0eecb541f4c383a0823902dc8f5d99861.tar.xz
ata: move sata_scr_*() to libata-sata.c
* move sata_scr_*() to libata-sata.c * add static inlines for CONFIG_SATA_HOST=n case Code size savings on m68k arch using (modified) atari_defconfig: text data bss dec hex filename before: 35642 572 40 36254 8d9e drivers/ata/libata-core.o 16607 18 0 16625 40f1 drivers/ata/libata-eh.o after: 32846 572 40 33458 82b2 drivers/ata/libata-core.o 16243 18 0 16261 3f85 drivers/ata/libata-eh.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>
Diffstat (limited to 'drivers/ata/libata-sata.c')
-rw-r--r--drivers/ata/libata-sata.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index 04f1ecaf414c..1ef4c19864ac 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -13,6 +13,115 @@
#include "libata.h"
/**
+ * sata_scr_valid - test whether SCRs are accessible
+ * @link: ATA link to test SCR accessibility for
+ *
+ * Test whether SCRs are accessible for @link.
+ *
+ * LOCKING:
+ * None.
+ *
+ * RETURNS:
+ * 1 if SCRs are accessible, 0 otherwise.
+ */
+int sata_scr_valid(struct ata_link *link)
+{
+ struct ata_port *ap = link->ap;
+
+ return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
+}
+EXPORT_SYMBOL_GPL(sata_scr_valid);
+
+/**
+ * sata_scr_read - read SCR register of the specified port
+ * @link: ATA link to read SCR for
+ * @reg: SCR to read
+ * @val: Place to store read value
+ *
+ * Read SCR register @reg of @link into *@val. This function is
+ * guaranteed to succeed if @link is ap->link, the cable type of
+ * the port is SATA and the port implements ->scr_read.
+ *
+ * LOCKING:
+ * None if @link is ap->link. Kernel thread context otherwise.
+ *
+ * RETURNS:
+ * 0 on success, negative errno on failure.
+ */
+int sata_scr_read(struct ata_link *link, int reg, u32 *val)
+{
+ if (ata_is_host_link(link)) {
+ if (sata_scr_valid(link))
+ return link->ap->ops->scr_read(link, reg, val);
+ return -EOPNOTSUPP;
+ }
+
+ return sata_pmp_scr_read(link, reg, val);
+}
+EXPORT_SYMBOL_GPL(sata_scr_read);
+
+/**
+ * sata_scr_write - write SCR register of the specified port
+ * @link: ATA link to write SCR for
+ * @reg: SCR to write
+ * @val: value to write
+ *
+ * Write @val to SCR register @reg of @link. This function is
+ * guaranteed to succeed if @link is ap->link, the cable type of
+ * the port is SATA and the port implements ->scr_read.
+ *
+ * LOCKING:
+ * None if @link is ap->link. Kernel thread context otherwise.
+ *
+ * RETURNS:
+ * 0 on success, negative errno on failure.
+ */
+int sata_scr_write(struct ata_link *link, int reg, u32 val)
+{
+ if (ata_is_host_link(link)) {
+ if (sata_scr_valid(link))
+ return link->ap->ops->scr_write(link, reg, val);
+ return -EOPNOTSUPP;
+ }
+
+ return sata_pmp_scr_write(link, reg, val);
+}
+EXPORT_SYMBOL_GPL(sata_scr_write);
+
+/**
+ * sata_scr_write_flush - write SCR register of the specified port and flush
+ * @link: ATA link to write SCR for
+ * @reg: SCR to write
+ * @val: value to write
+ *
+ * This function is identical to sata_scr_write() except that this
+ * function performs flush after writing to the register.
+ *
+ * LOCKING:
+ * None if @link is ap->link. Kernel thread context otherwise.
+ *
+ * RETURNS:
+ * 0 on success, negative errno on failure.
+ */
+int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
+{
+ if (ata_is_host_link(link)) {
+ int rc;
+
+ if (sata_scr_valid(link)) {
+ rc = link->ap->ops->scr_write(link, reg, val);
+ if (rc == 0)
+ rc = link->ap->ops->scr_read(link, reg, &val);
+ return rc;
+ }
+ return -EOPNOTSUPP;
+ }
+
+ return sata_pmp_scr_write(link, reg, val);
+}
+EXPORT_SYMBOL_GPL(sata_scr_write_flush);
+
+/**
* ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
* @tf: Taskfile to convert
* @pmp: Port multiplier port