Atsushi Nemoto wrote:
This is the driver for the Toshiba TX4939 SoC ATA controller.
This controller has standard ATA taskfile registers and DMA
command/status registers, but the register layout is swapped on big
endian. There are some other endian issue and some special registers
which requires many custom dma_ops/port_ops routines.
Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
---
This patch is against linux-next 20080905.
drivers/ide/Kconfig | 6 +
drivers/ide/mips/Makefile | 1 +
drivers/ide/mips/tx4939ide.c | 762 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 769 insertions(+), 0 deletions(-)
create mode 100644 drivers/ide/mips/tx4939ide.c
diff --git a/drivers/ide/mips/tx4939ide.c b/drivers/ide/mips/tx4939ide.c
new file mode 100644
index 0000000..ba9776d
--- /dev/null
+++ b/drivers/ide/mips/tx4939ide.c
@@ -0,0 +1,762 @@
[...]
+static void tx4939ide_set_mode(ide_drive_t *drive, const u8 speed)
+{
+ ide_hwif_t *hwif = HWIF(drive);
+ unsigned long base = TX4939IDE_BASE(hwif);
+ int is_slave = drive->dn & 1;
+ u16 value;
+ int safe_speed = speed;
+ int i;
+
+ for (i = 0; i < MAX_DRIVES; i++) {
Use ide_get_paired_drive() ISO this loop.
+ if (drive != &hwif->drives[i] &&
+ (hwif->drives[i].dev_flags & IDE_DFLAG_PRESENT))
+ safe_speed = min(safe_speed,
+ (int)hwif->drives[i].current_speed);
You shouldn't clamp the command PIO mode timings like this, and shouldn't
do it at all when DMA mode is set. Call ide_get_best_pio_mode(255, 4) to get
the mate drive's fastest PIO mode which should be a clamping value.
+ /* Command Transfer Mode Select */
+ switch (safe_speed) {
+ case XFER_UDMA_5:
+ case XFER_UDMA_4:
+ case XFER_UDMA_3:
+ case XFER_UDMA_2:
+ case XFER_UDMA_1:
+ case XFER_UDMA_0:
+ case XFER_MW_DMA_2:
You shouldn't change the command PIO mode when DMA mode is selected.
+ case XFER_MW_DMA_1:
+ case XFER_MW_DMA_0:
+ case XFER_PIO_4:
MWDMA0/1 timings don't match PIO4, they are [much] slower.
+ value |= 0x0400;
+ break;
+ case XFER_PIO_3:
+ value |= 0x0300;
+ break;
+ case XFER_PIO_2:
+ value |= 0x0200;
+ break;
+ case XFER_PIO_1:
+ value |= 0x0100;
+ break;
+ default:
+ case XFER_PIO_0:
+ value |= 0x0000;
+ break;
+ }
> +
+ if (is_slave)
+ hwif->select_data =
+ (hwif->select_data & ~0xffff0000) | (value << 16);
Why not just 0x0000ffff?
+ else
+ hwif->select_data = (hwif->select_data & ~0x0000ffff) | value;
Why not just 0xffff0000?
+ TX4939IDE_writew(value, base, Sys_Ctl);
+}
+
+static void tx4939ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
+{
+ tx4939ide_set_mode(drive, XFER_PIO_0 + pio);
+}
I suggest that you implement tx4939ide_set_{dma|pio}_mode() as seperate
functions, possibly using a common function to do a final part. These 2
methods are quite different functionally.
+
+static void tx4939ide_check_error_ints(ide_hwif_t *hwif, u16 stat)
+{
+ if (stat & TX4939IDE_INT_BUSERR) {
+ unsigned long base = TX4939IDE_BASE(hwif);
+ /* reset FIFO */
+ TX4939IDE_writew(TX4939IDE_readw(base, Sys_Ctl) |
+ 0x4000,
+ base, Sys_Ctl);
+ }
+ if (stat & (TX4939IDE_INT_ADDRERR | TX4939IDE_INT_REACHMUL |
+ TX4939IDE_INT_DEVTIMING | TX4939IDE_INT_BUSERR))
+ pr_err("%s: Error interrupt %#x (%s%s%s%s )\n",
+ hwif->name, stat,
+ (stat & TX4939IDE_INT_ADDRERR) ?
+ " Address-Error" : "",
+ (stat & TX4939IDE_INT_REACHMUL) ?
+ " Reach-Multiple" : "",
+ (stat & TX4939IDE_INT_DEVTIMING) ?
+ " DEV-Timing" : "",
+ (stat & TX4939IDE_INT_BUSERR) ?
+ " Bus-Error" : "");
+}
+
+static void tx4939ide_clear_irq(ide_drive_t *drive)
+{
+ ide_hwif_t *hwif;
+ unsigned long base;
+ u16 ctl;
+
+ /*
+ * tx4939ide_dma_test_irq() and tx4939ide_dma_end() do all
+ * jobs for DMA case.
+ */
+ if (drive->waiting_for_dma)
+ return;
+ hwif = HWIF(drive);
+ base = TX4939IDE_BASE(hwif);
+ ctl = TX4939IDE_readw(base, int_ctl);
+
+ tx4939ide_check_error_ints(hwif, ctl);
+ TX4939IDE_writew(ctl, base, int_ctl);
+}
+
+static int tx4939ide_dma_setup(ide_drive_t *drive)
+{
+ ide_hwif_t *hwif = HWIF(drive);
+ unsigned long base = TX4939IDE_BASE(hwif);
+ int is_slave = drive->dn & 1;
+ unsigned int nframes;
+ int rc, i;
+ unsigned int sect_size = queue_hardsect_size(drive->queue);
+ u16 select_data;
+
+ select_data = (hwif->select_data >> (is_slave ? 16 : 0)) & 0xffff;
+ TX4939IDE_writew(select_data, base, Sys_Ctl);
Unfortunately, programming the timings from the dma_setup() method isn't
enough since it won't be called for PIO transfers. You'll have to use the
selectproc() method.
MBR, Sergei
