PARPORT_EPP_FAST flag currently uses 32-bit I/O port access for data
read/write (insl/outsl).
Add PARPORT_EPP_FAST_16 and PARPORT_EPP_FAST_8 that use insw/outsw
and insb/outsb (and PARPORT_EPP_FAST_32 as alias for PARPORT_EPP_FAST).
Signed-off-by: Ondrej Zary <linux@xxxxxxx>
---
drivers/parport/parport_pc.c | 20 ++++++++++++++++----
include/uapi/linux/parport.h | 3 +++
2 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
index 5784dc20fb38..eda4e4e6d4e8 100644
--- a/drivers/parport/parport_pc.c
+++ b/drivers/parport/parport_pc.c
@@ -298,9 +298,15 @@ static size_t parport_pc_epp_read_data(struct parport *port, void *buf,
}
return got;
}
- if ((flags & PARPORT_EPP_FAST) && (length > 1)) {
- if (!(((long)buf | length) & 0x03))
+ if ((length > 1) && ((flags & PARPORT_EPP_FAST_32)
+ || flags & PARPORT_EPP_FAST_16
+ || flags & PARPORT_EPP_FAST_8)) {
+ if ((flags & PARPORT_EPP_FAST_32)
+ && !(((long)buf | length) & 0x03))
insl(EPPDATA(port), buf, (length >> 2));
+ else if ((flags & PARPORT_EPP_FAST_16)
+ && !(((long)buf | length) & 0x01))
+ insw(EPPDATA(port), buf, length >> 1);
else
insb(EPPDATA(port), buf, length);
if (inb(STATUS(port)) & 0x01) {
@@ -327,9 +333,15 @@ static size_t parport_pc_epp_write_data(struct parport *port, const void *buf,
{
size_t written = 0;
- if ((flags & PARPORT_EPP_FAST) && (length > 1)) {
- if (!(((long)buf | length) & 0x03))
+ if ((length > 1) && ((flags & PARPORT_EPP_FAST_32)
+ || flags & PARPORT_EPP_FAST_16
+ || flags & PARPORT_EPP_FAST_8)) {
+ if ((flags & PARPORT_EPP_FAST_32)
+ && !(((long)buf | length) & 0x03))
outsl(EPPDATA(port), buf, (length >> 2));
+ else if ((flags & PARPORT_EPP_FAST_16)
+ && !(((long)buf | length) & 0x01))
+ outsw(EPPDATA(port), buf, length >> 1);
else
outsb(EPPDATA(port), buf, length);
if (inb(STATUS(port)) & 0x01) {
diff --git a/include/uapi/linux/parport.h b/include/uapi/linux/parport.h
index f41388f88dc3..fe93e41fc205 100644
--- a/include/uapi/linux/parport.h
+++ b/include/uapi/linux/parport.h
@@ -90,6 +90,9 @@ typedef enum {
/* Flags for block transfer operations. */
#define PARPORT_EPP_FAST (1<<0) /* Unreliable counts. */
#define PARPORT_W91284PIC (1<<1) /* have a Warp9 w91284pic in the device */
+#define PARPORT_EPP_FAST_32 PARPORT_EPP_FAST /* 32-bit EPP transfers */
+#define PARPORT_EPP_FAST_16 (1<<2) /* 16-bit EPP transfers */
+#define PARPORT_EPP_FAST_8 (1<<3) /* 8-bit EPP transfers */
/* The rest is for the kernel only */
#endif /* _UAPI_PARPORT_H_ */
--
Ondrej Zary
