Hello, I wrote:
diff --git a/drivers/ata/pata_octeon_cf.c
b/drivers/ata/pata_octeon_cf.c
new file mode 100644
index 0000000..e8712c0
--- /dev/null
+++ b/drivers/ata/pata_octeon_cf.c
@@ -0,0 +1,942 @@
[...]
+/**
+ * Get the status of the DMA engine. The results of this function
+ * must emulate the BMDMA engine expected by libata.
+ *
+ * @ap: ATA port to check status on
+ *
+ * Returns BMDMA status bits
+ */
+static uint8_t octeon_cf_bmdma_status(struct ata_port *ap)
+{
+ struct octeon_cf_data *ocd = ap->dev->platform_data;
+ cvmx_mio_boot_dma_intx_t mio_boot_dma_int;
+ cvmx_mio_boot_dma_cfgx_t mio_boot_dma_cfg;
+ uint8_t result = 0;
+
+ mio_boot_dma_int.u64 =
+ cvmx_read_csr(CVMX_MIO_BOOT_DMA_INTX(ocd->dma_engine));
+ if (mio_boot_dma_int.s.done)
+ result |= ATA_DMA_INTR;
But if you're saying that there is only DMA completion inetrrupt,
you *cannot* completely emulate SFF-8038i BMDMA since its interrupt
status is the (delayed) IDE INTRQ status. I suggest that you move
away from the emulation -- Alan has said it's possible.
As part of our efforts to get the Cavium OCTEON processor support
My suggestion then is not to emulate the ATA_DMA_INTR bit (always
returning it as 0)
No, this is not an option because you chain to ata_sff_host_intr().
However, DMA interrupt status is *not* a substitute for SFF-8038i
interrupt status (as it gets set on the S/G segment boundaries too), so
you should employ the pure software emulation for this bit, only
triggering before the control gets passed to ata_sff_host_intr().
directly in octeon_cf_interrupt().
MBR, Sergei
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