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scsi: ppa: Add a module parameter for the transfer mode
I have an Iomega Z100P2 zip drive, but it does not work with my StarTech PEX1P2 AX99100 PCIe parallel port, which evidently does not support 16-bit or 32-bit EPP. Currently the only way to tell the PPA driver to use 8-bit EPP is to write 'mode=3' to /proc/scsi/ppa/*, but the driver doesn't actually distinguish between the three EPP modes and still tries to use 16-bit or 32-bit EPP. And even if writing to that file did make the driver use 8-bit EPP, it still wouldn't do me any good because by the time that file exists, the drive has already failed to initialize. Add a new parameter /sys/module/ppa/mode to set the transfer mode before initializing the drive. This parameter replaces the use of CONFIG_SCSI_IZIP_EPP16 in the PPA driver. At the same time, default to 8-bit EPP. 16-bit and 32-bit EPP are not necessary for the drive to function, nor are they part of the IEEE 1284 standard, so the driver should not assume that they are available. Signed-off-by: Alex Henrie <alexhenrie24@gmail.com> Link: https://lore.kernel.org/r/20230807155856.362864-2-alexhenrie24@gmail.com Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Alex Henrie
Martin K. Petersen
parent
b68442ebda
commit
68a4f84a17
@ -836,7 +836,7 @@ config SCSI_IMM
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config SCSI_IZIP_EPP16
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bool "ppa/imm option - Use slow (but safe) EPP-16"
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depends on SCSI_PPA || SCSI_IMM
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depends on SCSI_IMM
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help
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EPP (Enhanced Parallel Port) is a standard for parallel ports which
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allows them to act as expansion buses that can handle up to 64
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@ -45,6 +45,11 @@ typedef struct {
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#include "ppa.h"
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static unsigned int mode = PPA_AUTODETECT;
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module_param(mode, uint, 0644);
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MODULE_PARM_DESC(mode, "Transfer mode (0 = Autodetect, 1 = SPP 4-bit, "
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"2 = SPP 8-bit, 3 = EPP 8-bit, 4 = EPP 16-bit, 5 = EPP 32-bit");
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static struct scsi_pointer *ppa_scsi_pointer(struct scsi_cmnd *cmd)
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{
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return scsi_cmd_priv(cmd);
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@ -157,7 +162,7 @@ static int ppa_show_info(struct seq_file *m, struct Scsi_Host *host)
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return 0;
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}
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static int device_check(ppa_struct *dev);
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static int device_check(ppa_struct *dev, bool autodetect);
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#if PPA_DEBUG > 0
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#define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
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@ -302,13 +307,10 @@ static int ppa_out(ppa_struct *dev, char *buffer, int len)
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case PPA_EPP_8:
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epp_reset(ppb);
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w_ctr(ppb, 0x4);
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#ifdef CONFIG_SCSI_IZIP_EPP16
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if (!(((long) buffer | len) & 0x01))
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outsw(ppb + 4, buffer, len >> 1);
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#else
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if (!(((long) buffer | len) & 0x03))
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if (dev->mode == PPA_EPP_32 && !(((long) buffer | len) & 0x01))
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outsl(ppb + 4, buffer, len >> 2);
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#endif
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else if (dev->mode == PPA_EPP_16 && !(((long) buffer | len) & 0x03))
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outsw(ppb + 4, buffer, len >> 1);
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else
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outsb(ppb + 4, buffer, len);
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w_ctr(ppb, 0xc);
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@ -355,13 +357,10 @@ static int ppa_in(ppa_struct *dev, char *buffer, int len)
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case PPA_EPP_8:
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epp_reset(ppb);
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w_ctr(ppb, 0x24);
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#ifdef CONFIG_SCSI_IZIP_EPP16
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if (!(((long) buffer | len) & 0x01))
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insw(ppb + 4, buffer, len >> 1);
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#else
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if (!(((long) buffer | len) & 0x03))
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if (dev->mode == PPA_EPP_32 && !(((long) buffer | len) & 0x03))
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insl(ppb + 4, buffer, len >> 2);
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#endif
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else if (dev->mode == PPA_EPP_16 && !(((long) buffer | len) & 0x01))
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insw(ppb + 4, buffer, len >> 1);
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else
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insb(ppb + 4, buffer, len);
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w_ctr(ppb, 0x2c);
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@ -469,6 +468,27 @@ static int ppa_init(ppa_struct *dev)
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{
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int retv;
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unsigned short ppb = dev->base;
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bool autodetect = dev->mode == PPA_AUTODETECT;
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if (autodetect) {
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int modes = dev->dev->port->modes;
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int ppb_hi = dev->dev->port->base_hi;
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/* Mode detection works up the chain of speed
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* This avoids a nasty if-then-else-if-... tree
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*/
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dev->mode = PPA_NIBBLE;
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if (modes & PARPORT_MODE_TRISTATE)
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dev->mode = PPA_PS2;
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if (modes & PARPORT_MODE_ECP) {
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w_ecr(ppb_hi, 0x20);
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dev->mode = PPA_PS2;
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}
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if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
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w_ecr(ppb_hi, 0x80);
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}
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ppa_disconnect(dev);
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ppa_connect(dev, CONNECT_NORMAL);
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@ -492,7 +512,7 @@ static int ppa_init(ppa_struct *dev)
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if (retv)
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return -EIO;
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return device_check(dev);
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return device_check(dev, autodetect);
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}
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static inline int ppa_send_command(struct scsi_cmnd *cmd)
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@ -883,7 +903,7 @@ static int ppa_reset(struct scsi_cmnd *cmd)
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return SUCCESS;
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}
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static int device_check(ppa_struct *dev)
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static int device_check(ppa_struct *dev, bool autodetect)
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{
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/* This routine looks for a device and then attempts to use EPP
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to send a command. If all goes as planned then EPP is available. */
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@ -895,8 +915,8 @@ static int device_check(ppa_struct *dev)
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old_mode = dev->mode;
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for (loop = 0; loop < 8; loop++) {
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/* Attempt to use EPP for Test Unit Ready */
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if ((ppb & 0x0007) == 0x0000)
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dev->mode = PPA_EPP_32;
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if (autodetect && (ppb & 0x0007) == 0x0000)
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dev->mode = PPA_EPP_8;
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second_pass:
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ppa_connect(dev, CONNECT_EPP_MAYBE);
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@ -924,7 +944,7 @@ second_pass:
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udelay(1000);
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ppa_disconnect(dev);
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udelay(1000);
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if (dev->mode == PPA_EPP_32) {
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if (dev->mode != old_mode) {
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dev->mode = old_mode;
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goto second_pass;
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}
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@ -947,7 +967,7 @@ second_pass:
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udelay(1000);
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ppa_disconnect(dev);
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udelay(1000);
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if (dev->mode == PPA_EPP_32) {
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if (dev->mode != old_mode) {
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dev->mode = old_mode;
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goto second_pass;
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}
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@ -1026,7 +1046,6 @@ static int __ppa_attach(struct parport *pb)
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DEFINE_WAIT(wait);
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ppa_struct *dev, *temp;
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int ports;
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int modes, ppb, ppb_hi;
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int err = -ENOMEM;
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struct pardev_cb ppa_cb;
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@ -1034,7 +1053,7 @@ static int __ppa_attach(struct parport *pb)
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if (!dev)
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return -ENOMEM;
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dev->base = -1;
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dev->mode = PPA_AUTODETECT;
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dev->mode = mode < PPA_UNKNOWN ? mode : PPA_AUTODETECT;
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dev->recon_tmo = PPA_RECON_TMO;
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init_waitqueue_head(&waiting);
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temp = find_parent();
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@ -1069,25 +1088,8 @@ static int __ppa_attach(struct parport *pb)
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}
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dev->waiting = NULL;
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finish_wait(&waiting, &wait);
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ppb = dev->base = dev->dev->port->base;
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ppb_hi = dev->dev->port->base_hi;
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w_ctr(ppb, 0x0c);
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modes = dev->dev->port->modes;
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/* Mode detection works up the chain of speed
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* This avoids a nasty if-then-else-if-... tree
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*/
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dev->mode = PPA_NIBBLE;
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if (modes & PARPORT_MODE_TRISTATE)
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dev->mode = PPA_PS2;
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if (modes & PARPORT_MODE_ECP) {
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w_ecr(ppb_hi, 0x20);
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dev->mode = PPA_PS2;
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}
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if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
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w_ecr(ppb_hi, 0x80);
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dev->base = dev->dev->port->base;
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w_ctr(dev->base, 0x0c);
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/* Done configuration */
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@ -107,11 +107,7 @@ static char *PPA_MODE_STRING[] =
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"PS/2",
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"EPP 8 bit",
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"EPP 16 bit",
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#ifdef CONFIG_SCSI_IZIP_EPP16
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"EPP 16 bit",
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#else
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"EPP 32 bit",
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#endif
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"Unknown"};
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/* other options */
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