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author | Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | 2020-03-26 16:58:11 +0100 |
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committer | Jens Axboe <axboe@kernel.dk> | 2020-03-26 10:28:19 -0600 |
commit | 7fe183c773c42f9814cd361c45a0233f441bc4fc (patch) | |
tree | 3553149188ac70a9d0dd654e9ac54dbbfc524501 /drivers/ata/libata-core.c | |
parent | 4c9029e7d00f31923bcecbaab6a12ba52017924e (diff) | |
download | linux-stable-7fe183c773c42f9814cd361c45a0233f441bc4fc.tar.gz linux-stable-7fe183c773c42f9814cd361c45a0233f441bc4fc.tar.bz2 linux-stable-7fe183c773c42f9814cd361c45a0233f441bc4fc.zip |
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>
Diffstat (limited to 'drivers/ata/libata-core.c')
-rw-r--r-- | drivers/ata/libata-core.c | 245 |
1 files changed, 0 insertions, 245 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index dcdb7fb46dbd..b4a952dce7ab 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -531,81 +531,6 @@ int atapi_cmd_type(u8 opcode) } EXPORT_SYMBOL_GPL(atapi_cmd_type); -/** - * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure - * @tf: Taskfile to convert - * @pmp: Port multiplier port - * @is_cmd: This FIS is for command - * @fis: Buffer into which data will output - * - * Converts a standard ATA taskfile to a Serial ATA - * FIS structure (Register - Host to Device). - * - * LOCKING: - * Inherited from caller. - */ -void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis) -{ - fis[0] = 0x27; /* Register - Host to Device FIS */ - fis[1] = pmp & 0xf; /* Port multiplier number*/ - if (is_cmd) - fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */ - - fis[2] = tf->command; - fis[3] = tf->feature; - - fis[4] = tf->lbal; - fis[5] = tf->lbam; - fis[6] = tf->lbah; - fis[7] = tf->device; - - fis[8] = tf->hob_lbal; - fis[9] = tf->hob_lbam; - fis[10] = tf->hob_lbah; - fis[11] = tf->hob_feature; - - fis[12] = tf->nsect; - fis[13] = tf->hob_nsect; - fis[14] = 0; - fis[15] = tf->ctl; - - fis[16] = tf->auxiliary & 0xff; - fis[17] = (tf->auxiliary >> 8) & 0xff; - fis[18] = (tf->auxiliary >> 16) & 0xff; - fis[19] = (tf->auxiliary >> 24) & 0xff; -} -EXPORT_SYMBOL_GPL(ata_tf_to_fis); - -/** - * ata_tf_from_fis - Convert SATA FIS to ATA taskfile - * @fis: Buffer from which data will be input - * @tf: Taskfile to output - * - * Converts a serial ATA FIS structure to a standard ATA taskfile. - * - * LOCKING: - * Inherited from caller. - */ - -void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf) -{ - tf->command = fis[2]; /* status */ - tf->feature = fis[3]; /* error */ - - tf->lbal = fis[4]; - tf->lbam = fis[5]; - tf->lbah = fis[6]; - tf->device = fis[7]; - - tf->hob_lbal = fis[8]; - tf->hob_lbam = fis[9]; - tf->hob_lbah = fis[10]; - - tf->nsect = fis[12]; - tf->hob_nsect = fis[13]; -} -EXPORT_SYMBOL_GPL(ata_tf_from_fis); - static const u8 ata_rw_cmds[] = { /* pio multi */ ATA_CMD_READ_MULTI, @@ -3780,81 +3705,6 @@ int sata_link_resume(struct ata_link *link, const unsigned long *params, EXPORT_SYMBOL_GPL(sata_link_resume); /** - * sata_link_scr_lpm - manipulate SControl IPM and SPM fields - * @link: ATA link to manipulate SControl for - * @policy: LPM policy to configure - * @spm_wakeup: initiate LPM transition to active state - * - * Manipulate the IPM field of the SControl register of @link - * according to @policy. If @policy is ATA_LPM_MAX_POWER and - * @spm_wakeup is %true, the SPM field is manipulated to wake up - * the link. This function also clears PHYRDY_CHG before - * returning. - * - * LOCKING: - * EH context. - * - * RETURNS: - * 0 on success, -errno otherwise. - */ -int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy, - bool spm_wakeup) -{ - struct ata_eh_context *ehc = &link->eh_context; - bool woken_up = false; - u32 scontrol; - int rc; - - rc = sata_scr_read(link, SCR_CONTROL, &scontrol); - if (rc) - return rc; - - switch (policy) { - case ATA_LPM_MAX_POWER: - /* disable all LPM transitions */ - scontrol |= (0x7 << 8); - /* initiate transition to active state */ - if (spm_wakeup) { - scontrol |= (0x4 << 12); - woken_up = true; - } - break; - case ATA_LPM_MED_POWER: - /* allow LPM to PARTIAL */ - scontrol &= ~(0x1 << 8); - scontrol |= (0x6 << 8); - break; - case ATA_LPM_MED_POWER_WITH_DIPM: - case ATA_LPM_MIN_POWER_WITH_PARTIAL: - case ATA_LPM_MIN_POWER: - if (ata_link_nr_enabled(link) > 0) - /* no restrictions on LPM transitions */ - scontrol &= ~(0x7 << 8); - else { - /* empty port, power off */ - scontrol &= ~0xf; - scontrol |= (0x1 << 2); - } - break; - default: - WARN_ON(1); - } - - rc = sata_scr_write(link, SCR_CONTROL, scontrol); - if (rc) - return rc; - - /* give the link time to transit out of LPM state */ - if (woken_up) - msleep(10); - - /* clear PHYRDY_CHG from SError */ - ehc->i.serror &= ~SERR_PHYRDY_CHG; - return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); -} -EXPORT_SYMBOL_GPL(sata_link_scr_lpm); - -/** * ata_std_prereset - prepare for reset * @link: ATA link to be reset * @deadline: deadline jiffies for the operation @@ -6118,69 +5968,6 @@ struct ata_host *ata_host_alloc_pinfo(struct device *dev, } EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo); -/** - * ata_slave_link_init - initialize slave link - * @ap: port to initialize slave link for - * - * Create and initialize slave link for @ap. This enables slave - * link handling on the port. - * - * In libata, a port contains links and a link contains devices. - * There is single host link but if a PMP is attached to it, - * there can be multiple fan-out links. On SATA, there's usually - * a single device connected to a link but PATA and SATA - * controllers emulating TF based interface can have two - master - * and slave. - * - * However, there are a few controllers which don't fit into this - * abstraction too well - SATA controllers which emulate TF - * interface with both master and slave devices but also have - * separate SCR register sets for each device. These controllers - * need separate links for physical link handling - * (e.g. onlineness, link speed) but should be treated like a - * traditional M/S controller for everything else (e.g. command - * issue, softreset). - * - * slave_link is libata's way of handling this class of - * controllers without impacting core layer too much. For - * anything other than physical link handling, the default host - * link is used for both master and slave. For physical link - * handling, separate @ap->slave_link is used. All dirty details - * are implemented inside libata core layer. From LLD's POV, the - * only difference is that prereset, hardreset and postreset are - * called once more for the slave link, so the reset sequence - * looks like the following. - * - * prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) -> - * softreset(M) -> postreset(M) -> postreset(S) - * - * Note that softreset is called only for the master. Softreset - * resets both M/S by definition, so SRST on master should handle - * both (the standard method will work just fine). - * - * LOCKING: - * Should be called before host is registered. - * - * RETURNS: - * 0 on success, -errno on failure. - */ -int ata_slave_link_init(struct ata_port *ap) -{ - struct ata_link *link; - - WARN_ON(ap->slave_link); - WARN_ON(ap->flags & ATA_FLAG_PMP); - - link = kzalloc(sizeof(*link), GFP_KERNEL); - if (!link) - return -ENOMEM; - - ata_link_init(ap, link, 1); - ap->slave_link = link; - return 0; -} -EXPORT_SYMBOL_GPL(ata_slave_link_init); - static void ata_host_stop(struct device *gendev, void *res) { struct ata_host *host = dev_get_drvdata(gendev); @@ -7106,38 +6893,6 @@ u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val, } EXPORT_SYMBOL_GPL(ata_wait_register); -/** - * sata_lpm_ignore_phy_events - test if PHY event should be ignored - * @link: Link receiving the event - * - * Test whether the received PHY event has to be ignored or not. - * - * LOCKING: - * None: - * - * RETURNS: - * True if the event has to be ignored. - */ -bool sata_lpm_ignore_phy_events(struct ata_link *link) -{ - unsigned long lpm_timeout = link->last_lpm_change + - msecs_to_jiffies(ATA_TMOUT_SPURIOUS_PHY); - - /* if LPM is enabled, PHYRDY doesn't mean anything */ - if (link->lpm_policy > ATA_LPM_MAX_POWER) - return true; - - /* ignore the first PHY event after the LPM policy changed - * as it is might be spurious - */ - if ((link->flags & ATA_LFLAG_CHANGED) && - time_before(jiffies, lpm_timeout)) - return true; - - return false; -} -EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events); - /* * Dummy port_ops */ |