diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/DocBook/libata.tmpl | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/Documentation/DocBook/libata.tmpl b/Documentation/DocBook/libata.tmpl index 77b4a223a86..6df1dfd18b6 100644 --- a/Documentation/DocBook/libata.tmpl +++ b/Documentation/DocBook/libata.tmpl @@ -60,9 +60,22 @@ <chapter id="libataDriverApi"> <title>libata Driver API</title> + <para> + struct ata_port_operations is defined for every low-level libata + hardware driver, and it controls how the low-level driver + interfaces with the ATA and SCSI layers. + </para> + <para> + FIS-based drivers will hook into the system with ->qc_prep() and + ->qc_issue() high-level hooks. Hardware which behaves in a manner + similar to PCI IDE hardware may utilize several generic helpers, + defining at a bare minimum the bus I/O addresses of the ATA shadow + register blocks. + </para> <sect1> <title>struct ata_port_operations</title> + <sect2><title>Disable ATA port</title> <programlisting> void (*port_disable) (struct ata_port *); </programlisting> @@ -73,6 +86,9 @@ void (*port_disable) (struct ata_port *); unplug). </para> + </sect2> + + <sect2><title>Post-IDENTIFY device configuration</title> <programlisting> void (*dev_config) (struct ata_port *, struct ata_device *); </programlisting> @@ -83,6 +99,9 @@ void (*dev_config) (struct ata_port *, struct ata_device *); issue of SET FEATURES - XFER MODE, and prior to operation. </para> + </sect2> + + <sect2><title>Set PIO/DMA mode</title> <programlisting> void (*set_piomode) (struct ata_port *, struct ata_device *); void (*set_dmamode) (struct ata_port *, struct ata_device *); @@ -103,6 +122,9 @@ void (*post_set_mode) (struct ata_port *ap); ->set_dma_mode() is only called if DMA is possible. </para> + </sect2> + + <sect2><title>Taskfile read/write</title> <programlisting> void (*tf_load) (struct ata_port *ap, struct ata_taskfile *tf); void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf); @@ -115,6 +137,9 @@ void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf); taskfile register values. </para> + </sect2> + + <sect2><title>ATA command execute</title> <programlisting> void (*exec_command)(struct ata_port *ap, struct ata_taskfile *tf); </programlisting> @@ -124,6 +149,9 @@ void (*exec_command)(struct ata_port *ap, struct ata_taskfile *tf); ->tf_load(), to be initiated in hardware. </para> + </sect2> + + <sect2><title>Per-cmd ATAPI DMA capabilities filter</title> <programlisting> int (*check_atapi_dma) (struct ata_queued_cmd *qc); </programlisting> @@ -134,6 +162,9 @@ indicating whether or not it is OK to use DMA for the supplied PACKET command. </para> + </sect2> + + <sect2><title>Read specific ATA shadow registers</title> <programlisting> u8 (*check_status)(struct ata_port *ap); u8 (*check_altstatus)(struct ata_port *ap); @@ -146,6 +177,9 @@ u8 (*check_err)(struct ata_port *ap); the side effect of clearing the interrupt condition. </para> + </sect2> + + <sect2><title>Select ATA device on bus</title> <programlisting> void (*dev_select)(struct ata_port *ap, unsigned int device); </programlisting> @@ -157,6 +191,9 @@ void (*dev_select)(struct ata_port *ap, unsigned int device); meaning on FIS-based devices. </para> + </sect2> + + <sect2><title>Reset ATA bus</title> <programlisting> void (*phy_reset) (struct ata_port *ap); </programlisting> @@ -169,6 +206,9 @@ void (*phy_reset) (struct ata_port *ap); functions ata_bus_reset() or sata_phy_reset() for this hook. </para> + </sect2> + + <sect2><title>Control PCI IDE BMDMA engine</title> <programlisting> void (*bmdma_setup) (struct ata_queued_cmd *qc); void (*bmdma_start) (struct ata_queued_cmd *qc); @@ -188,6 +228,9 @@ These hooks are typically either no-ops, or simply not implemented, in FIS-based drivers. </para> + </sect2> + + <sect2><title>High-level taskfile hooks</title> <programlisting> void (*qc_prep) (struct ata_queued_cmd *qc); int (*qc_issue) (struct ata_queued_cmd *qc); @@ -208,6 +251,9 @@ int (*qc_issue) (struct ata_queued_cmd *qc); dispatch. More advanced drivers implement their own ->qc_issue. </para> + </sect2> + + <sect2><title>Timeout (error) handling</title> <programlisting> void (*eng_timeout) (struct ata_port *ap); </programlisting> @@ -219,6 +265,9 @@ hardware will implement its own error handling code here. IDE BMDMA drivers may use the helper function ata_eng_timeout(). </para> + </sect2> + + <sect2><title>Hardware interrupt handling</title> <programlisting> irqreturn_t (*irq_handler)(int, void *, struct pt_regs *); void (*irq_clear) (struct ata_port *); @@ -231,6 +280,9 @@ void (*irq_clear) (struct ata_port *); is quiet. </para> + </sect2> + + <sect2><title>SATA phy read/write</title> <programlisting> u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg); void (*scr_write) (struct ata_port *ap, unsigned int sc_reg, @@ -242,6 +294,9 @@ void (*scr_write) (struct ata_port *ap, unsigned int sc_reg, if ->phy_reset hook called the sata_phy_reset() helper function. </para> + </sect2> + + <sect2><title>Init and shutdown</title> <programlisting> int (*port_start) (struct ata_port *ap); void (*port_stop) (struct ata_port *ap); @@ -265,6 +320,8 @@ have completed. The hook must finalize hardware shutdown, release DMA and other resources, etc. </para> + </sect2> + </sect1> </chapter> |