mirror of https://gitee.com/openkylin/linux.git
ata: move sata_link_{debounce,resume}() to libata-sata.c
* move sata_link_{debounce,resume}() to libata-sata.c
* add static inline for CONFIG_SATA_HOST=n case (only one,
for sata_link_resume() is needed)
Code size savings on m68k arch using (modified) atari_defconfig:
text data bss dec hex filename
before:
32816 572 40 33428 8294 drivers/ata/libata-core.o
after:
32724 572 40 33336 8238 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>
This commit is contained in:
Bartlomiej Zolnierkiewicz
Jens Axboe
parent
ab4117cf24
commit
9d3158f5cb
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@ -3485,144 +3485,6 @@ int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
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}
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EXPORT_SYMBOL_GPL(ata_wait_after_reset);
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/**
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* sata_link_debounce - debounce SATA phy status
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* @link: ATA link to debounce SATA phy status for
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* @params: timing parameters { interval, duration, timeout } in msec
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* @deadline: deadline jiffies for the operation
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*
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* Make sure SStatus of @link reaches stable state, determined by
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* holding the same value where DET is not 1 for @duration polled
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* every @interval, before @timeout. Timeout constraints the
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* beginning of the stable state. Because DET gets stuck at 1 on
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* some controllers after hot unplugging, this functions waits
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* until timeout then returns 0 if DET is stable at 1.
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*
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* @timeout is further limited by @deadline. The sooner of the
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* two is used.
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*
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* LOCKING:
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* Kernel thread context (may sleep)
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int sata_link_debounce(struct ata_link *link, const unsigned long *params,
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unsigned long deadline)
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{
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unsigned long interval = params[0];
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unsigned long duration = params[1];
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unsigned long last_jiffies, t;
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u32 last, cur;
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int rc;
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t = ata_deadline(jiffies, params[2]);
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if (time_before(t, deadline))
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deadline = t;
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if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
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return rc;
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cur &= 0xf;
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last = cur;
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last_jiffies = jiffies;
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while (1) {
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ata_msleep(link->ap, interval);
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if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
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return rc;
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cur &= 0xf;
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/* DET stable? */
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if (cur == last) {
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if (cur == 1 && time_before(jiffies, deadline))
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continue;
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if (time_after(jiffies,
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ata_deadline(last_jiffies, duration)))
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return 0;
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continue;
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}
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/* unstable, start over */
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last = cur;
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last_jiffies = jiffies;
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/* Check deadline. If debouncing failed, return
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* -EPIPE to tell upper layer to lower link speed.
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*/
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if (time_after(jiffies, deadline))
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return -EPIPE;
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}
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}
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EXPORT_SYMBOL_GPL(sata_link_debounce);
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/**
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* sata_link_resume - resume SATA link
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* @link: ATA link to resume SATA
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* @params: timing parameters { interval, duration, timeout } in msec
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* @deadline: deadline jiffies for the operation
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*
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* Resume SATA phy @link and debounce it.
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*
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* LOCKING:
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* Kernel thread context (may sleep)
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int sata_link_resume(struct ata_link *link, const unsigned long *params,
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unsigned long deadline)
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{
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int tries = ATA_LINK_RESUME_TRIES;
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u32 scontrol, serror;
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int rc;
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if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
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return rc;
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/*
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* Writes to SControl sometimes get ignored under certain
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* controllers (ata_piix SIDPR). Make sure DET actually is
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* cleared.
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*/
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do {
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scontrol = (scontrol & 0x0f0) | 0x300;
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if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
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return rc;
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/*
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* Some PHYs react badly if SStatus is pounded
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* immediately after resuming. Delay 200ms before
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* debouncing.
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*/
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if (!(link->flags & ATA_LFLAG_NO_DB_DELAY))
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ata_msleep(link->ap, 200);
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/* is SControl restored correctly? */
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if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
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return rc;
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} while ((scontrol & 0xf0f) != 0x300 && --tries);
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if ((scontrol & 0xf0f) != 0x300) {
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ata_link_warn(link, "failed to resume link (SControl %X)\n",
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scontrol);
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return 0;
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}
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if (tries < ATA_LINK_RESUME_TRIES)
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ata_link_warn(link, "link resume succeeded after %d retries\n",
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ATA_LINK_RESUME_TRIES - tries);
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if ((rc = sata_link_debounce(link, params, deadline)))
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return rc;
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/* clear SError, some PHYs require this even for SRST to work */
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if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
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rc = sata_scr_write(link, SCR_ERROR, serror);
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return rc != -EINVAL ? rc : 0;
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}
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EXPORT_SYMBOL_GPL(sata_link_resume);
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/**
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* ata_std_prereset - prepare for reset
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* @link: ATA link to be reset
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@ -196,6 +196,144 @@ void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
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}
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EXPORT_SYMBOL_GPL(ata_tf_from_fis);
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/**
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* sata_link_debounce - debounce SATA phy status
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* @link: ATA link to debounce SATA phy status for
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* @params: timing parameters { interval, duration, timeout } in msec
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* @deadline: deadline jiffies for the operation
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*
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* Make sure SStatus of @link reaches stable state, determined by
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* holding the same value where DET is not 1 for @duration polled
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* every @interval, before @timeout. Timeout constraints the
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* beginning of the stable state. Because DET gets stuck at 1 on
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* some controllers after hot unplugging, this functions waits
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* until timeout then returns 0 if DET is stable at 1.
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*
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* @timeout is further limited by @deadline. The sooner of the
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* two is used.
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*
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* LOCKING:
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* Kernel thread context (may sleep)
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int sata_link_debounce(struct ata_link *link, const unsigned long *params,
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unsigned long deadline)
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{
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unsigned long interval = params[0];
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unsigned long duration = params[1];
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unsigned long last_jiffies, t;
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u32 last, cur;
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int rc;
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t = ata_deadline(jiffies, params[2]);
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if (time_before(t, deadline))
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deadline = t;
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if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
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return rc;
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cur &= 0xf;
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last = cur;
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last_jiffies = jiffies;
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while (1) {
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ata_msleep(link->ap, interval);
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if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
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return rc;
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cur &= 0xf;
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/* DET stable? */
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if (cur == last) {
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if (cur == 1 && time_before(jiffies, deadline))
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continue;
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if (time_after(jiffies,
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ata_deadline(last_jiffies, duration)))
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return 0;
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continue;
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}
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/* unstable, start over */
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last = cur;
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last_jiffies = jiffies;
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/* Check deadline. If debouncing failed, return
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* -EPIPE to tell upper layer to lower link speed.
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*/
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if (time_after(jiffies, deadline))
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return -EPIPE;
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}
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}
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EXPORT_SYMBOL_GPL(sata_link_debounce);
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/**
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* sata_link_resume - resume SATA link
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* @link: ATA link to resume SATA
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* @params: timing parameters { interval, duration, timeout } in msec
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* @deadline: deadline jiffies for the operation
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*
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* Resume SATA phy @link and debounce it.
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*
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* LOCKING:
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* Kernel thread context (may sleep)
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int sata_link_resume(struct ata_link *link, const unsigned long *params,
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unsigned long deadline)
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{
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int tries = ATA_LINK_RESUME_TRIES;
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u32 scontrol, serror;
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int rc;
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if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
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return rc;
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/*
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* Writes to SControl sometimes get ignored under certain
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* controllers (ata_piix SIDPR). Make sure DET actually is
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* cleared.
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*/
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do {
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scontrol = (scontrol & 0x0f0) | 0x300;
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if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
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return rc;
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/*
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* Some PHYs react badly if SStatus is pounded
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* immediately after resuming. Delay 200ms before
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* debouncing.
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*/
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if (!(link->flags & ATA_LFLAG_NO_DB_DELAY))
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ata_msleep(link->ap, 200);
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/* is SControl restored correctly? */
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if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
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return rc;
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} while ((scontrol & 0xf0f) != 0x300 && --tries);
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if ((scontrol & 0xf0f) != 0x300) {
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ata_link_warn(link, "failed to resume link (SControl %X)\n",
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scontrol);
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return 0;
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}
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if (tries < ATA_LINK_RESUME_TRIES)
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ata_link_warn(link, "link resume succeeded after %d retries\n",
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ATA_LINK_RESUME_TRIES - tries);
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if ((rc = sata_link_debounce(link, params, deadline)))
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return rc;
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/* clear SError, some PHYs require this even for SRST to work */
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if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
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rc = sata_scr_write(link, SCR_ERROR, serror);
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return rc != -EINVAL ? rc : 0;
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}
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EXPORT_SYMBOL_GPL(sata_link_resume);
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/**
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* sata_link_scr_lpm - manipulate SControl IPM and SPM fields
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* @link: ATA link to manipulate SControl for
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@ -1077,10 +1077,6 @@ static inline int ata_port_is_dummy(struct ata_port *ap)
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extern int ata_std_prereset(struct ata_link *link, unsigned long deadline);
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extern int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
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int (*check_ready)(struct ata_link *link));
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extern int sata_link_debounce(struct ata_link *link,
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const unsigned long *params, unsigned long deadline);
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extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
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unsigned long deadline);
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extern int sata_link_hardreset(struct ata_link *link,
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const unsigned long *timing, unsigned long deadline,
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bool *online, int (*check_ready)(struct ata_link *));
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@ -1194,6 +1190,8 @@ extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
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extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
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extern int sata_scr_write_flush(struct ata_link *link, int reg, u32 val);
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extern int sata_set_spd(struct ata_link *link);
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extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
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unsigned long deadline);
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#else
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static inline int sata_scr_valid(struct ata_link *link) { return 0; }
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static inline int sata_scr_read(struct ata_link *link, int reg, u32 *val)
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@ -1209,7 +1207,15 @@ static inline int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
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return -EOPNOTSUPP;
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}
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static inline int sata_set_spd(struct ata_link *link) { return -EOPNOTSUPP; }
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static inline int sata_link_resume(struct ata_link *link,
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const unsigned long *params,
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unsigned long deadline)
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{
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return -EOPNOTSUPP;
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}
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#endif
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extern int sata_link_debounce(struct ata_link *link,
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const unsigned long *params, unsigned long deadline);
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extern int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
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bool spm_wakeup);
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extern int ata_slave_link_init(struct ata_port *ap);
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