From 6dae44f9a55f13765c877687602cd2bf1a057cfd Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Mon, 15 Jun 2009 18:52:52 +0200 Subject: ata: add ata_id_pio_need_iordy() helper (v2) v2: Minor fixes per Sergei's review. Cc: Sergei Shtylyov Cc: Jeff Garzik Signed-off-by: Bartlomiej Zolnierkiewicz --- include/linux/ata.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'include') diff --git a/include/linux/ata.h b/include/linux/ata.h index 915da43edee1..9c75921f0c16 100644 --- a/include/linux/ata.h +++ b/include/linux/ata.h @@ -800,6 +800,20 @@ static inline int ata_id_is_ssd(const u16 *id) return id[ATA_ID_ROT_SPEED] == 0x01; } +static inline int ata_id_pio_need_iordy(const u16 *id, const u8 pio) +{ + /* CF spec. r4.1 Table 22 says no IORDY on PIO5 and PIO6. */ + if (pio > 4 && ata_id_is_cfa(id)) + return 0; + /* For PIO3 and higher it is mandatory. */ + if (pio > 2) + return 1; + /* Turn it on when possible. */ + if (ata_id_has_iordy(id)) + return 1; + return 0; +} + static inline int ata_drive_40wire(const u16 *dev_id) { if (ata_id_is_sata(dev_id)) -- cgit v1.2.1