Two bugfixes, one workaround and IDE command set registers support for fit3
driver. All needed for EXP Computer CD-865 drive with MC-1285B EPP cable to
work.
Signed-off-by: Ondrej Zary <[email protected]>
---
Changes in v4:
- coding style fixes in patch 3
drivers/ata/pata_parport/fit3.c | 14 +-----
drivers/ata/pata_parport/pata_parport.c | 78 ++++++++++++++++++++++++++++++++-
2 files changed, 78 insertions(+), 14 deletions(-)
--
Ondrej Zary
There's a 'x' missing in 0x55 in pata_parport_devchk(), causing the
detection to always fail. Fix it.
Fixes: 246a1c4c6b7f ("ata: pata_parport: add driver (PARIDE replacement)")
Cc: [email protected]
Signed-off-by: Ondrej Zary <[email protected]>
Reviewed-by: Sergey Shtylyov <[email protected]>
---
drivers/ata/pata_parport/pata_parport.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/ata/pata_parport/pata_parport.c b/drivers/ata/pata_parport/pata_parport.c
index 1af64d435d3c..258d189f42e5 100644
--- a/drivers/ata/pata_parport/pata_parport.c
+++ b/drivers/ata/pata_parport/pata_parport.c
@@ -64,7 +64,7 @@ static bool pata_parport_devchk(struct ata_port *ap, unsigned int device)
pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 0xaa);
pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0x55);
- pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 055);
+ pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 0x55);
pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0xaa);
nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT);
--
Ondrej Zary
Some parallel adapters (e.g. EXP Computer MC-1285B EPP Cable) return
bogus values when there's no master device present. This can cause
reset to fail, preventing the lone slave device (such as EXP Computer
CD-865) from working.
Add custom version of wait_after_reset that ignores master failure when
a slave device is present. The custom version is also needed because
the generic ata_sff_wait_after_reset uses direct port I/O for slave
device detection.
Signed-off-by: Ondrej Zary <[email protected]>
Reviewed-by: Sergey Shtylyov <[email protected]>
---
drivers/ata/pata_parport/pata_parport.c | 68 ++++++++++++++++++++++++-
1 file changed, 67 insertions(+), 1 deletion(-)
diff --git a/drivers/ata/pata_parport/pata_parport.c b/drivers/ata/pata_parport/pata_parport.c
index cf87bbb52f1f..a7adfdcb5e27 100644
--- a/drivers/ata/pata_parport/pata_parport.c
+++ b/drivers/ata/pata_parport/pata_parport.c
@@ -80,6 +80,72 @@ static bool pata_parport_devchk(struct ata_port *ap, unsigned int device)
return (nsect == 0x55) && (lbal == 0xaa);
}
+static int pata_parport_wait_after_reset(struct ata_link *link,
+ unsigned int devmask,
+ unsigned long deadline)
+{
+ struct ata_port *ap = link->ap;
+ struct pi_adapter *pi = ap->host->private_data;
+ unsigned int dev0 = devmask & (1 << 0);
+ unsigned int dev1 = devmask & (1 << 1);
+ int rc, ret = 0;
+
+ ata_msleep(ap, ATA_WAIT_AFTER_RESET);
+
+ /* always check readiness of the master device */
+ rc = ata_sff_wait_ready(link, deadline);
+ if (rc) {
+ /*
+ * some adapters return bogus values if master device is not
+ * present, so don't abort now if a slave device is present
+ */
+ if (!dev1)
+ return rc;
+ ret = -ENODEV;
+ }
+
+ /*
+ * if device 1 was found in ata_devchk, wait for register
+ * access briefly, then wait for BSY to clear.
+ */
+ if (dev1) {
+ int i;
+
+ pata_parport_dev_select(ap, 1);
+
+ /*
+ * Wait for register access. Some ATAPI devices fail
+ * to set nsect/lbal after reset, so don't waste too
+ * much time on it. We're gonna wait for !BSY anyway.
+ */
+ for (i = 0; i < 2; i++) {
+ u8 nsect, lbal;
+
+ nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT);
+ lbal = pi->proto->read_regr(pi, 0, ATA_REG_LBAL);
+ if (nsect == 1 && lbal == 1)
+ break;
+ /* give drive a breather */
+ ata_msleep(ap, 50);
+ }
+
+ rc = ata_sff_wait_ready(link, deadline);
+ if (rc) {
+ if (rc != -ENODEV)
+ return rc;
+ ret = rc;
+ }
+ }
+
+ pata_parport_dev_select(ap, 0);
+ if (dev1)
+ pata_parport_dev_select(ap, 1);
+ if (dev0)
+ pata_parport_dev_select(ap, 0);
+
+ return ret;
+}
+
static int pata_parport_bus_softreset(struct ata_port *ap, unsigned int devmask,
unsigned long deadline)
{
@@ -94,7 +160,7 @@ static int pata_parport_bus_softreset(struct ata_port *ap, unsigned int devmask,
ap->last_ctl = ap->ctl;
/* wait the port to become ready */
- return ata_sff_wait_after_reset(&ap->link, devmask, deadline);
+ return pata_parport_wait_after_reset(&ap->link, devmask, deadline);
}
static int pata_parport_softreset(struct ata_link *link, unsigned int *classes,
--
Ondrej Zary
Add missing ops->sff_set_devctl implementation.
Fixes: 246a1c4c6b7f ("ata: pata_parport: add driver (PARIDE replacement)")
Cc: [email protected]
Signed-off-by: Ondrej Zary <[email protected]>
Reviewed-by: Sergey Shtylyov <[email protected]>
---
drivers/ata/pata_parport/pata_parport.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/ata/pata_parport/pata_parport.c b/drivers/ata/pata_parport/pata_parport.c
index 258d189f42e5..cf87bbb52f1f 100644
--- a/drivers/ata/pata_parport/pata_parport.c
+++ b/drivers/ata/pata_parport/pata_parport.c
@@ -51,6 +51,13 @@ static void pata_parport_dev_select(struct ata_port *ap, unsigned int device)
ata_sff_pause(ap);
}
+static void pata_parport_set_devctl(struct ata_port *ap, u8 ctl)
+{
+ struct pi_adapter *pi = ap->host->private_data;
+
+ pi->proto->write_regr(pi, 1, 6, ctl);
+}
+
static bool pata_parport_devchk(struct ata_port *ap, unsigned int device)
{
struct pi_adapter *pi = ap->host->private_data;
@@ -252,6 +259,7 @@ static struct ata_port_operations pata_parport_port_ops = {
.hardreset = NULL,
.sff_dev_select = pata_parport_dev_select,
+ .sff_set_devctl = pata_parport_set_devctl,
.sff_check_status = pata_parport_check_status,
.sff_check_altstatus = pata_parport_check_altstatus,
.sff_tf_load = pata_parport_tf_load,
--
Ondrej Zary
fit3 protocol driver does not support accessing IDE control registers
(device control/altstatus). The DOS driver does not use these registers
either (as observed from DOSEMU trace). But the HW seems to be capable
of accessing these registers - I simply tried bit 3 and it works!
The control register is required to properly reset ATAPI devices or
they will be detected only once (after a power cycle).
Tested with EXP Computer CD-865 with MC-1285B EPP cable and
TransDisk 3000.
Signed-off-by: Ondrej Zary <[email protected]>
Reviewed-by: Sergey Shtylyov <[email protected]>
---
drivers/ata/pata_parport/fit3.c | 14 ++------------
1 file changed, 2 insertions(+), 12 deletions(-)
diff --git a/drivers/ata/pata_parport/fit3.c b/drivers/ata/pata_parport/fit3.c
index bad7aa920cdc..d2b81cf2e16d 100644
--- a/drivers/ata/pata_parport/fit3.c
+++ b/drivers/ata/pata_parport/fit3.c
@@ -9,11 +9,6 @@
*
* The TD-2000 and certain older devices use a different protocol.
* Try the fit2 protocol module with them.
- *
- * NB: The FIT adapters do not appear to support the control
- * registers. So, we map ALT_STATUS to STATUS and NO-OP writes
- * to the device control register - this means that IDE reset
- * will not work on these devices.
*/
#include <linux/module.h>
@@ -37,8 +32,7 @@
static void fit3_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
- if (cont == 1)
- return;
+ regr += cont << 3;
switch (pi->mode) {
case 0:
@@ -59,11 +53,7 @@ static int fit3_read_regr(struct pi_adapter *pi, int cont, int regr)
{
int a, b;
- if (cont) {
- if (regr != 6)
- return 0xff;
- regr = 7;
- }
+ regr += cont << 3;
switch (pi->mode) {
case 0:
--
Ondrej Zary
On 10/6/23 05:55, Ondrej Zary wrote:
>
> Two bugfixes, one workaround and IDE command set registers support for fit3
> driver. All needed for EXP Computer CD-865 drive with MC-1285B EPP cable to
> work.
>
> Signed-off-by: Ondrej Zary <[email protected]>
> ---
> Changes in v4:
> - coding style fixes in patch 3
>
> drivers/ata/pata_parport/fit3.c | 14 +-----
> drivers/ata/pata_parport/pata_parport.c | 78 ++++++++++++++++++++++++++++++++-
> 2 files changed, 78 insertions(+), 14 deletions(-)
Applied to for-6.6-fixes. Thanks !
--
Damien Le Moal
Western Digital Research