mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2024-12-29 09:13:38 +00:00
scsi: imm: Add a module parameter for the transfer mode
Fix in the imm driver the same problem that was fixed in the ppa driver by
commit 68a4f84a17 ("scsi: ppa: Add a module parameter for the transfer
mode").
Tested and confirmed working with an Iomega Z250P zip drive and a StarTech
PEX1P2 AX99100 PCIe parallel port.
Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Link: https://lore.kernel.org/r/20230831054620.515611-1-alexhenrie24@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Alex Henrie
Martin K. Petersen
parent
1345a7d909
commit
b0597fd5a9
@ -834,21 +834,6 @@ config SCSI_IMM
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called imm.
|
||||
|
||||
config SCSI_IZIP_EPP16
|
||||
bool "ppa/imm option - Use slow (but safe) EPP-16"
|
||||
depends on SCSI_IMM
|
||||
help
|
||||
EPP (Enhanced Parallel Port) is a standard for parallel ports which
|
||||
allows them to act as expansion buses that can handle up to 64
|
||||
peripheral devices.
|
||||
|
||||
Some parallel port chipsets are slower than their motherboard, and
|
||||
so we have to control the state of the chipset's FIFO queue every
|
||||
now and then to avoid data loss. This will be done if you say Y
|
||||
here.
|
||||
|
||||
Generally, saying Y is the safe option and slows things down a bit.
|
||||
|
||||
config SCSI_IZIP_SLOW_CTR
|
||||
bool "ppa/imm option - Assume slow parport control register"
|
||||
depends on SCSI_PPA || SCSI_IMM
|
||||
|
||||
@ -51,10 +51,15 @@ typedef struct {
|
||||
} imm_struct;
|
||||
|
||||
static void imm_reset_pulse(unsigned int base);
|
||||
static int device_check(imm_struct *dev);
|
||||
static int device_check(imm_struct *dev, bool autodetect);
|
||||
|
||||
#include "imm.h"
|
||||
|
||||
static unsigned int mode = IMM_AUTODETECT;
|
||||
module_param(mode, uint, 0644);
|
||||
MODULE_PARM_DESC(mode, "Transfer mode (0 = Autodetect, 1 = SPP 4-bit, "
|
||||
"2 = SPP 8-bit, 3 = EPP 8-bit, 4 = EPP 16-bit, 5 = EPP 32-bit");
|
||||
|
||||
static inline imm_struct *imm_dev(struct Scsi_Host *host)
|
||||
{
|
||||
return *(imm_struct **)&host->hostdata;
|
||||
@ -366,13 +371,10 @@ static int imm_out(imm_struct *dev, char *buffer, int len)
|
||||
case IMM_EPP_8:
|
||||
epp_reset(ppb);
|
||||
w_ctr(ppb, 0x4);
|
||||
#ifdef CONFIG_SCSI_IZIP_EPP16
|
||||
if (!(((long) buffer | len) & 0x01))
|
||||
outsw(ppb + 4, buffer, len >> 1);
|
||||
#else
|
||||
if (!(((long) buffer | len) & 0x03))
|
||||
if (dev->mode == IMM_EPP_32 && !(((long) buffer | len) & 0x03))
|
||||
outsl(ppb + 4, buffer, len >> 2);
|
||||
#endif
|
||||
else if (dev->mode == IMM_EPP_16 && !(((long) buffer | len) & 0x01))
|
||||
outsw(ppb + 4, buffer, len >> 1);
|
||||
else
|
||||
outsb(ppb + 4, buffer, len);
|
||||
w_ctr(ppb, 0xc);
|
||||
@ -426,13 +428,10 @@ static int imm_in(imm_struct *dev, char *buffer, int len)
|
||||
case IMM_EPP_8:
|
||||
epp_reset(ppb);
|
||||
w_ctr(ppb, 0x24);
|
||||
#ifdef CONFIG_SCSI_IZIP_EPP16
|
||||
if (!(((long) buffer | len) & 0x01))
|
||||
insw(ppb + 4, buffer, len >> 1);
|
||||
#else
|
||||
if (!(((long) buffer | len) & 0x03))
|
||||
insl(ppb + 4, buffer, len >> 2);
|
||||
#endif
|
||||
if (dev->mode == IMM_EPP_32 && !(((long) buffer | len) & 0x03))
|
||||
insw(ppb + 4, buffer, len >> 2);
|
||||
else if (dev->mode == IMM_EPP_16 && !(((long) buffer | len) & 0x01))
|
||||
insl(ppb + 4, buffer, len >> 1);
|
||||
else
|
||||
insb(ppb + 4, buffer, len);
|
||||
w_ctr(ppb, 0x2c);
|
||||
@ -589,13 +588,28 @@ static int imm_select(imm_struct *dev, int target)
|
||||
|
||||
static int imm_init(imm_struct *dev)
|
||||
{
|
||||
bool autodetect = dev->mode == IMM_AUTODETECT;
|
||||
|
||||
if (autodetect) {
|
||||
int modes = dev->dev->port->modes;
|
||||
|
||||
/* Mode detection works up the chain of speed
|
||||
* This avoids a nasty if-then-else-if-... tree
|
||||
*/
|
||||
dev->mode = IMM_NIBBLE;
|
||||
|
||||
if (modes & PARPORT_MODE_TRISTATE)
|
||||
dev->mode = IMM_PS2;
|
||||
}
|
||||
|
||||
if (imm_connect(dev, 0) != 1)
|
||||
return -EIO;
|
||||
imm_reset_pulse(dev->base);
|
||||
mdelay(1); /* Delay to allow devices to settle */
|
||||
imm_disconnect(dev);
|
||||
mdelay(1); /* Another delay to allow devices to settle */
|
||||
return device_check(dev);
|
||||
|
||||
return device_check(dev, autodetect);
|
||||
}
|
||||
|
||||
static inline int imm_send_command(struct scsi_cmnd *cmd)
|
||||
@ -1000,7 +1014,7 @@ static int imm_reset(struct scsi_cmnd *cmd)
|
||||
return SUCCESS;
|
||||
}
|
||||
|
||||
static int device_check(imm_struct *dev)
|
||||
static int device_check(imm_struct *dev, bool autodetect)
|
||||
{
|
||||
/* This routine looks for a device and then attempts to use EPP
|
||||
to send a command. If all goes as planned then EPP is available. */
|
||||
@ -1012,8 +1026,8 @@ static int device_check(imm_struct *dev)
|
||||
old_mode = dev->mode;
|
||||
for (loop = 0; loop < 8; loop++) {
|
||||
/* Attempt to use EPP for Test Unit Ready */
|
||||
if ((ppb & 0x0007) == 0x0000)
|
||||
dev->mode = IMM_EPP_32;
|
||||
if (autodetect && (ppb & 0x0007) == 0x0000)
|
||||
dev->mode = IMM_EPP_8;
|
||||
|
||||
second_pass:
|
||||
imm_connect(dev, CONNECT_EPP_MAYBE);
|
||||
@ -1038,7 +1052,7 @@ static int device_check(imm_struct *dev)
|
||||
udelay(1000);
|
||||
imm_disconnect(dev);
|
||||
udelay(1000);
|
||||
if (dev->mode == IMM_EPP_32) {
|
||||
if (dev->mode != old_mode) {
|
||||
dev->mode = old_mode;
|
||||
goto second_pass;
|
||||
}
|
||||
@ -1063,7 +1077,7 @@ static int device_check(imm_struct *dev)
|
||||
udelay(1000);
|
||||
imm_disconnect(dev);
|
||||
udelay(1000);
|
||||
if (dev->mode == IMM_EPP_32) {
|
||||
if (dev->mode != old_mode) {
|
||||
dev->mode = old_mode;
|
||||
goto second_pass;
|
||||
}
|
||||
@ -1150,7 +1164,6 @@ static int __imm_attach(struct parport *pb)
|
||||
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
|
||||
DEFINE_WAIT(wait);
|
||||
int ports;
|
||||
int modes, ppb;
|
||||
int err = -ENOMEM;
|
||||
struct pardev_cb imm_cb;
|
||||
|
||||
@ -1162,7 +1175,7 @@ static int __imm_attach(struct parport *pb)
|
||||
|
||||
|
||||
dev->base = -1;
|
||||
dev->mode = IMM_AUTODETECT;
|
||||
dev->mode = mode < IMM_UNKNOWN ? mode : IMM_AUTODETECT;
|
||||
INIT_LIST_HEAD(&dev->list);
|
||||
|
||||
temp = find_parent();
|
||||
@ -1197,18 +1210,9 @@ static int __imm_attach(struct parport *pb)
|
||||
}
|
||||
dev->waiting = NULL;
|
||||
finish_wait(&waiting, &wait);
|
||||
ppb = dev->base = dev->dev->port->base;
|
||||
dev->base = dev->dev->port->base;
|
||||
dev->base_hi = dev->dev->port->base_hi;
|
||||
w_ctr(ppb, 0x0c);
|
||||
modes = dev->dev->port->modes;
|
||||
|
||||
/* Mode detection works up the chain of speed
|
||||
* This avoids a nasty if-then-else-if-... tree
|
||||
*/
|
||||
dev->mode = IMM_NIBBLE;
|
||||
|
||||
if (modes & PARPORT_MODE_TRISTATE)
|
||||
dev->mode = IMM_PS2;
|
||||
w_ctr(dev->base, 0x0c);
|
||||
|
||||
/* Done configuration */
|
||||
|
||||
|
||||
@ -100,11 +100,7 @@ static char *IMM_MODE_STRING[] =
|
||||
[IMM_PS2] = "PS/2",
|
||||
[IMM_EPP_8] = "EPP 8 bit",
|
||||
[IMM_EPP_16] = "EPP 16 bit",
|
||||
#ifdef CONFIG_SCSI_IZIP_EPP16
|
||||
[IMM_EPP_32] = "EPP 16 bit",
|
||||
#else
|
||||
[IMM_EPP_32] = "EPP 32 bit",
|
||||
#endif
|
||||
[IMM_UNKNOWN] = "Unknown",
|
||||
};
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user