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![Gustavo A. R. Silva](/assets/img/avatar_default.png)
In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. Addresses-Coverity-ID: 114988 Addresses-Coverity-ID: 114989 Addresses-Coverity-ID: 114990 Addresses-Coverity-ID: 114991 Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
1168 lines
26 KiB
C
1168 lines
26 KiB
C
/* ppa.c -- low level driver for the IOMEGA PPA3
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* parallel port SCSI host adapter.
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*
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* (The PPA3 is the embedded controller in the ZIP drive.)
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*
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* (c) 1995,1996 Grant R. Guenther, grant@torque.net,
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* under the terms of the GNU General Public License.
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*
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/parport.h>
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#include <linux/workqueue.h>
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#include <linux/delay.h>
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#include <linux/jiffies.h>
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#include <asm/io.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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static void ppa_reset_pulse(unsigned int base);
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typedef struct {
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struct pardevice *dev; /* Parport device entry */
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int base; /* Actual port address */
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int mode; /* Transfer mode */
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struct scsi_cmnd *cur_cmd; /* Current queued command */
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struct delayed_work ppa_tq; /* Polling interrupt stuff */
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unsigned long jstart; /* Jiffies at start */
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unsigned long recon_tmo; /* How many usecs to wait for reconnection (6th bit) */
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unsigned int failed:1; /* Failure flag */
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unsigned wanted:1; /* Parport sharing busy flag */
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unsigned int dev_no; /* Device number */
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wait_queue_head_t *waiting;
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struct Scsi_Host *host;
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struct list_head list;
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} ppa_struct;
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#include "ppa.h"
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static inline ppa_struct *ppa_dev(struct Scsi_Host *host)
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{
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return *(ppa_struct **)&host->hostdata;
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}
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static DEFINE_SPINLOCK(arbitration_lock);
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static void got_it(ppa_struct *dev)
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{
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dev->base = dev->dev->port->base;
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if (dev->cur_cmd)
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dev->cur_cmd->SCp.phase = 1;
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else
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wake_up(dev->waiting);
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}
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static void ppa_wakeup(void *ref)
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{
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ppa_struct *dev = (ppa_struct *) ref;
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unsigned long flags;
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spin_lock_irqsave(&arbitration_lock, flags);
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if (dev->wanted) {
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parport_claim(dev->dev);
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got_it(dev);
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dev->wanted = 0;
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}
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spin_unlock_irqrestore(&arbitration_lock, flags);
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return;
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}
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static int ppa_pb_claim(ppa_struct *dev)
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{
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unsigned long flags;
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int res = 1;
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spin_lock_irqsave(&arbitration_lock, flags);
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if (parport_claim(dev->dev) == 0) {
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got_it(dev);
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res = 0;
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}
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dev->wanted = res;
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spin_unlock_irqrestore(&arbitration_lock, flags);
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return res;
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}
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static void ppa_pb_dismiss(ppa_struct *dev)
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{
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unsigned long flags;
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int wanted;
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spin_lock_irqsave(&arbitration_lock, flags);
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wanted = dev->wanted;
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dev->wanted = 0;
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spin_unlock_irqrestore(&arbitration_lock, flags);
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if (!wanted)
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parport_release(dev->dev);
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}
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static inline void ppa_pb_release(ppa_struct *dev)
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{
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parport_release(dev->dev);
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}
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/*
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* Start of Chipset kludges
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*/
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/* This is to give the ppa driver a way to modify the timings (and other
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* parameters) by writing to the /proc/scsi/ppa/0 file.
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* Very simple method really... (To simple, no error checking :( )
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* Reason: Kernel hackers HATE having to unload and reload modules for
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* testing...
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* Also gives a method to use a script to obtain optimum timings (TODO)
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*/
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static inline int ppa_write_info(struct Scsi_Host *host, char *buffer, int length)
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{
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ppa_struct *dev = ppa_dev(host);
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unsigned long x;
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if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
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x = simple_strtoul(buffer + 5, NULL, 0);
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dev->mode = x;
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return length;
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}
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if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) {
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x = simple_strtoul(buffer + 10, NULL, 0);
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dev->recon_tmo = x;
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printk(KERN_INFO "ppa: recon_tmo set to %ld\n", x);
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return length;
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}
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printk(KERN_WARNING "ppa /proc: invalid variable\n");
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return -EINVAL;
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}
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static int ppa_show_info(struct seq_file *m, struct Scsi_Host *host)
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{
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ppa_struct *dev = ppa_dev(host);
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seq_printf(m, "Version : %s\n", PPA_VERSION);
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seq_printf(m, "Parport : %s\n", dev->dev->port->name);
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seq_printf(m, "Mode : %s\n", PPA_MODE_STRING[dev->mode]);
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#if PPA_DEBUG > 0
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seq_printf(m, "recon_tmo : %lu\n", dev->recon_tmo);
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#endif
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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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#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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y, __func__, __LINE__); ppa_fail_func(x,y);
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static inline void ppa_fail_func(ppa_struct *dev, int error_code)
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#else
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static inline void ppa_fail(ppa_struct *dev, int error_code)
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#endif
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{
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/* If we fail a device then we trash status / message bytes */
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if (dev->cur_cmd) {
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dev->cur_cmd->result = error_code << 16;
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dev->failed = 1;
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}
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}
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/*
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* Wait for the high bit to be set.
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*
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* In principle, this could be tied to an interrupt, but the adapter
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* doesn't appear to be designed to support interrupts. We spin on
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* the 0x80 ready bit.
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*/
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static unsigned char ppa_wait(ppa_struct *dev)
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{
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int k;
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unsigned short ppb = dev->base;
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unsigned char r;
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k = PPA_SPIN_TMO;
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/* Wait for bit 6 and 7 - PJC */
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for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) {
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udelay(1);
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r = r_str(ppb);
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}
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/*
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* return some status information.
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* Semantics: 0xc0 = ZIP wants more data
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* 0xd0 = ZIP wants to send more data
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* 0xe0 = ZIP is expecting SCSI command data
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* 0xf0 = end of transfer, ZIP is sending status
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*/
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if (k)
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return (r & 0xf0);
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/* Counter expired - Time out occurred */
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ppa_fail(dev, DID_TIME_OUT);
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printk(KERN_WARNING "ppa timeout in ppa_wait\n");
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return 0; /* command timed out */
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}
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/*
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* Clear EPP Timeout Bit
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*/
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static inline void epp_reset(unsigned short ppb)
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{
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int i;
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i = r_str(ppb);
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w_str(ppb, i);
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w_str(ppb, i & 0xfe);
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}
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/*
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* Wait for empty ECP fifo (if we are in ECP fifo mode only)
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*/
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static inline void ecp_sync(ppa_struct *dev)
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{
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int i, ppb_hi = dev->dev->port->base_hi;
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if (ppb_hi == 0)
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return;
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if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
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for (i = 0; i < 100; i++) {
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if (r_ecr(ppb_hi) & 0x01)
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return;
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udelay(5);
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}
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printk(KERN_WARNING "ppa: ECP sync failed as data still present in FIFO.\n");
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}
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}
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static int ppa_byte_out(unsigned short base, const char *buffer, int len)
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{
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int i;
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for (i = len; i; i--) {
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w_dtr(base, *buffer++);
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w_ctr(base, 0xe);
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w_ctr(base, 0xc);
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}
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return 1; /* All went well - we hope! */
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}
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static int ppa_byte_in(unsigned short base, char *buffer, int len)
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{
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int i;
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for (i = len; i; i--) {
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*buffer++ = r_dtr(base);
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w_ctr(base, 0x27);
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w_ctr(base, 0x25);
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}
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return 1; /* All went well - we hope! */
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}
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static int ppa_nibble_in(unsigned short base, char *buffer, int len)
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{
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for (; len; len--) {
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unsigned char h;
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w_ctr(base, 0x4);
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h = r_str(base) & 0xf0;
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w_ctr(base, 0x6);
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*buffer++ = h | ((r_str(base) & 0xf0) >> 4);
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}
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return 1; /* All went well - we hope! */
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}
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static int ppa_out(ppa_struct *dev, char *buffer, int len)
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{
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int r;
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unsigned short ppb = dev->base;
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r = ppa_wait(dev);
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if ((r & 0x50) != 0x40) {
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ppa_fail(dev, DID_ERROR);
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return 0;
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}
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switch (dev->mode) {
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case PPA_NIBBLE:
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case PPA_PS2:
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/* 8 bit output, with a loop */
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r = ppa_byte_out(ppb, buffer, len);
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break;
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case PPA_EPP_32:
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case PPA_EPP_16:
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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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outsl(ppb + 4, buffer, len >> 2);
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#endif
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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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r = !(r_str(ppb) & 0x01);
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w_ctr(ppb, 0xc);
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ecp_sync(dev);
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break;
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default:
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printk(KERN_ERR "PPA: bug in ppa_out()\n");
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r = 0;
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}
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return r;
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}
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static int ppa_in(ppa_struct *dev, char *buffer, int len)
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{
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int r;
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unsigned short ppb = dev->base;
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r = ppa_wait(dev);
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if ((r & 0x50) != 0x50) {
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ppa_fail(dev, DID_ERROR);
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return 0;
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}
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switch (dev->mode) {
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case PPA_NIBBLE:
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/* 4 bit input, with a loop */
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r = ppa_nibble_in(ppb, buffer, len);
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w_ctr(ppb, 0xc);
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break;
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case PPA_PS2:
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/* 8 bit input, with a loop */
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w_ctr(ppb, 0x25);
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r = ppa_byte_in(ppb, buffer, len);
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w_ctr(ppb, 0x4);
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w_ctr(ppb, 0xc);
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break;
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case PPA_EPP_32:
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case PPA_EPP_16:
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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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insl(ppb + 4, buffer, len >> 2);
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#endif
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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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r = !(r_str(ppb) & 0x01);
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w_ctr(ppb, 0x2c);
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ecp_sync(dev);
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break;
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default:
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printk(KERN_ERR "PPA: bug in ppa_ins()\n");
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r = 0;
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break;
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}
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return r;
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}
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/* end of ppa_io.h */
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static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
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{
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w_dtr(ppb, b);
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w_ctr(ppb, 0xc);
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w_ctr(ppb, 0xe);
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w_ctr(ppb, 0xc);
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w_ctr(ppb, 0x4);
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w_ctr(ppb, 0xc);
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}
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static void ppa_disconnect(ppa_struct *dev)
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{
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unsigned short ppb = dev->base;
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ppa_d_pulse(ppb, 0);
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ppa_d_pulse(ppb, 0x3c);
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ppa_d_pulse(ppb, 0x20);
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ppa_d_pulse(ppb, 0xf);
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}
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static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
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{
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w_dtr(ppb, b);
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w_ctr(ppb, 0x4);
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w_ctr(ppb, 0x6);
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w_ctr(ppb, 0x4);
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w_ctr(ppb, 0xc);
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}
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static inline void ppa_connect(ppa_struct *dev, int flag)
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{
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unsigned short ppb = dev->base;
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ppa_c_pulse(ppb, 0);
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ppa_c_pulse(ppb, 0x3c);
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ppa_c_pulse(ppb, 0x20);
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if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode))
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ppa_c_pulse(ppb, 0xcf);
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else
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ppa_c_pulse(ppb, 0x8f);
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}
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static int ppa_select(ppa_struct *dev, int target)
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{
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int k;
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unsigned short ppb = dev->base;
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/*
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* Bit 6 (0x40) is the device selected bit.
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* First we must wait till the current device goes off line...
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*/
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k = PPA_SELECT_TMO;
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do {
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k--;
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udelay(1);
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} while ((r_str(ppb) & 0x40) && (k));
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if (!k)
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return 0;
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w_dtr(ppb, (1 << target));
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w_ctr(ppb, 0xe);
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w_ctr(ppb, 0xc);
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w_dtr(ppb, 0x80); /* This is NOT the initator */
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w_ctr(ppb, 0x8);
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k = PPA_SELECT_TMO;
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do {
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k--;
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udelay(1);
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}
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while (!(r_str(ppb) & 0x40) && (k));
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if (!k)
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return 0;
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return 1;
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}
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/*
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* This is based on a trace of what the Iomega DOS 'guest' driver does.
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* I've tried several different kinds of parallel ports with guest and
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* coded this to react in the same ways that it does.
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*
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* The return value from this function is just a hint about where the
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* handshaking failed.
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*
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*/
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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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ppa_disconnect(dev);
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ppa_connect(dev, CONNECT_NORMAL);
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retv = 2; /* Failed */
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w_ctr(ppb, 0xe);
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if ((r_str(ppb) & 0x08) == 0x08)
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retv--;
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w_ctr(ppb, 0xc);
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if ((r_str(ppb) & 0x08) == 0x00)
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retv--;
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if (!retv)
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ppa_reset_pulse(ppb);
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udelay(1000); /* Allow devices to settle down */
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ppa_disconnect(dev);
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udelay(1000); /* Another delay to allow devices to settle */
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if (retv)
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return -EIO;
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|
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return device_check(dev);
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}
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static inline int ppa_send_command(struct scsi_cmnd *cmd)
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{
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ppa_struct *dev = ppa_dev(cmd->device->host);
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int k;
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w_ctr(dev->base, 0x0c);
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for (k = 0; k < cmd->cmd_len; k++)
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if (!ppa_out(dev, &cmd->cmnd[k], 1))
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return 0;
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return 1;
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}
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|
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/*
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* The bulk flag enables some optimisations in the data transfer loops,
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* it should be true for any command that transfers data in integral
|
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* numbers of sectors.
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*
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* The driver appears to remain stable if we speed up the parallel port
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* i/o in this function, but not elsewhere.
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*/
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static int ppa_completion(struct scsi_cmnd *cmd)
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{
|
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/* Return codes:
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* -1 Error
|
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* 0 Told to schedule
|
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* 1 Finished data transfer
|
|
*/
|
|
ppa_struct *dev = ppa_dev(cmd->device->host);
|
|
unsigned short ppb = dev->base;
|
|
unsigned long start_jiffies = jiffies;
|
|
|
|
unsigned char r, v;
|
|
int fast, bulk, status;
|
|
|
|
v = cmd->cmnd[0];
|
|
bulk = ((v == READ_6) ||
|
|
(v == READ_10) || (v == WRITE_6) || (v == WRITE_10));
|
|
|
|
/*
|
|
* We only get here if the drive is ready to comunicate,
|
|
* hence no need for a full ppa_wait.
|
|
*/
|
|
r = (r_str(ppb) & 0xf0);
|
|
|
|
while (r != (unsigned char) 0xf0) {
|
|
/*
|
|
* If we have been running for more than a full timer tick
|
|
* then take a rest.
|
|
*/
|
|
if (time_after(jiffies, start_jiffies + 1))
|
|
return 0;
|
|
|
|
if ((cmd->SCp.this_residual <= 0)) {
|
|
ppa_fail(dev, DID_ERROR);
|
|
return -1; /* ERROR_RETURN */
|
|
}
|
|
|
|
/* On some hardware we have SCSI disconnected (6th bit low)
|
|
* for about 100usecs. It is too expensive to wait a
|
|
* tick on every loop so we busy wait for no more than
|
|
* 500usecs to give the drive a chance first. We do not
|
|
* change things for "normal" hardware since generally
|
|
* the 6th bit is always high.
|
|
* This makes the CPU load higher on some hardware
|
|
* but otherwise we can not get more than 50K/secs
|
|
* on this problem hardware.
|
|
*/
|
|
if ((r & 0xc0) != 0xc0) {
|
|
/* Wait for reconnection should be no more than
|
|
* jiffy/2 = 5ms = 5000 loops
|
|
*/
|
|
unsigned long k = dev->recon_tmo;
|
|
for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0;
|
|
k--)
|
|
udelay(1);
|
|
|
|
if (!k)
|
|
return 0;
|
|
}
|
|
|
|
/* determine if we should use burst I/O */
|
|
fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
|
|
? PPA_BURST_SIZE : 1;
|
|
|
|
if (r == (unsigned char) 0xc0)
|
|
status = ppa_out(dev, cmd->SCp.ptr, fast);
|
|
else
|
|
status = ppa_in(dev, cmd->SCp.ptr, fast);
|
|
|
|
cmd->SCp.ptr += fast;
|
|
cmd->SCp.this_residual -= fast;
|
|
|
|
if (!status) {
|
|
ppa_fail(dev, DID_BUS_BUSY);
|
|
return -1; /* ERROR_RETURN */
|
|
}
|
|
if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
|
|
/* if scatter/gather, advance to the next segment */
|
|
if (cmd->SCp.buffers_residual--) {
|
|
cmd->SCp.buffer++;
|
|
cmd->SCp.this_residual =
|
|
cmd->SCp.buffer->length;
|
|
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
|
|
}
|
|
}
|
|
/* Now check to see if the drive is ready to comunicate */
|
|
r = (r_str(ppb) & 0xf0);
|
|
/* If not, drop back down to the scheduler and wait a timer tick */
|
|
if (!(r & 0x80))
|
|
return 0;
|
|
}
|
|
return 1; /* FINISH_RETURN */
|
|
}
|
|
|
|
/*
|
|
* Since the PPA itself doesn't generate interrupts, we use
|
|
* the scheduler's task queue to generate a stream of call-backs and
|
|
* complete the request when the drive is ready.
|
|
*/
|
|
static void ppa_interrupt(struct work_struct *work)
|
|
{
|
|
ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work);
|
|
struct scsi_cmnd *cmd = dev->cur_cmd;
|
|
|
|
if (!cmd) {
|
|
printk(KERN_ERR "PPA: bug in ppa_interrupt\n");
|
|
return;
|
|
}
|
|
if (ppa_engine(dev, cmd)) {
|
|
schedule_delayed_work(&dev->ppa_tq, 1);
|
|
return;
|
|
}
|
|
/* Command must of completed hence it is safe to let go... */
|
|
#if PPA_DEBUG > 0
|
|
switch ((cmd->result >> 16) & 0xff) {
|
|
case DID_OK:
|
|
break;
|
|
case DID_NO_CONNECT:
|
|
printk(KERN_DEBUG "ppa: no device at SCSI ID %i\n", cmd->device->target);
|
|
break;
|
|
case DID_BUS_BUSY:
|
|
printk(KERN_DEBUG "ppa: BUS BUSY - EPP timeout detected\n");
|
|
break;
|
|
case DID_TIME_OUT:
|
|
printk(KERN_DEBUG "ppa: unknown timeout\n");
|
|
break;
|
|
case DID_ABORT:
|
|
printk(KERN_DEBUG "ppa: told to abort\n");
|
|
break;
|
|
case DID_PARITY:
|
|
printk(KERN_DEBUG "ppa: parity error (???)\n");
|
|
break;
|
|
case DID_ERROR:
|
|
printk(KERN_DEBUG "ppa: internal driver error\n");
|
|
break;
|
|
case DID_RESET:
|
|
printk(KERN_DEBUG "ppa: told to reset device\n");
|
|
break;
|
|
case DID_BAD_INTR:
|
|
printk(KERN_WARNING "ppa: bad interrupt (???)\n");
|
|
break;
|
|
default:
|
|
printk(KERN_WARNING "ppa: bad return code (%02x)\n",
|
|
(cmd->result >> 16) & 0xff);
|
|
}
|
|
#endif
|
|
|
|
if (cmd->SCp.phase > 1)
|
|
ppa_disconnect(dev);
|
|
|
|
ppa_pb_dismiss(dev);
|
|
|
|
dev->cur_cmd = NULL;
|
|
|
|
cmd->scsi_done(cmd);
|
|
}
|
|
|
|
static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd)
|
|
{
|
|
unsigned short ppb = dev->base;
|
|
unsigned char l = 0, h = 0;
|
|
int retv;
|
|
|
|
/* First check for any errors that may of occurred
|
|
* Here we check for internal errors
|
|
*/
|
|
if (dev->failed)
|
|
return 0;
|
|
|
|
switch (cmd->SCp.phase) {
|
|
case 0: /* Phase 0 - Waiting for parport */
|
|
if (time_after(jiffies, dev->jstart + HZ)) {
|
|
/*
|
|
* We waited more than a second
|
|
* for parport to call us
|
|
*/
|
|
ppa_fail(dev, DID_BUS_BUSY);
|
|
return 0;
|
|
}
|
|
return 1; /* wait until ppa_wakeup claims parport */
|
|
case 1: /* Phase 1 - Connected */
|
|
{ /* Perform a sanity check for cable unplugged */
|
|
int retv = 2; /* Failed */
|
|
|
|
ppa_connect(dev, CONNECT_EPP_MAYBE);
|
|
|
|
w_ctr(ppb, 0xe);
|
|
if ((r_str(ppb) & 0x08) == 0x08)
|
|
retv--;
|
|
|
|
w_ctr(ppb, 0xc);
|
|
if ((r_str(ppb) & 0x08) == 0x00)
|
|
retv--;
|
|
|
|
if (retv) {
|
|
if (time_after(jiffies, dev->jstart + (1 * HZ))) {
|
|
printk(KERN_ERR "ppa: Parallel port cable is unplugged.\n");
|
|
ppa_fail(dev, DID_BUS_BUSY);
|
|
return 0;
|
|
} else {
|
|
ppa_disconnect(dev);
|
|
return 1; /* Try again in a jiffy */
|
|
}
|
|
}
|
|
cmd->SCp.phase++;
|
|
}
|
|
|
|
case 2: /* Phase 2 - We are now talking to the scsi bus */
|
|
if (!ppa_select(dev, scmd_id(cmd))) {
|
|
ppa_fail(dev, DID_NO_CONNECT);
|
|
return 0;
|
|
}
|
|
cmd->SCp.phase++;
|
|
/* fall through */
|
|
|
|
case 3: /* Phase 3 - Ready to accept a command */
|
|
w_ctr(ppb, 0x0c);
|
|
if (!(r_str(ppb) & 0x80))
|
|
return 1;
|
|
|
|
if (!ppa_send_command(cmd))
|
|
return 0;
|
|
cmd->SCp.phase++;
|
|
/* fall through */
|
|
|
|
case 4: /* Phase 4 - Setup scatter/gather buffers */
|
|
if (scsi_bufflen(cmd)) {
|
|
cmd->SCp.buffer = scsi_sglist(cmd);
|
|
cmd->SCp.this_residual = cmd->SCp.buffer->length;
|
|
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
|
|
} else {
|
|
cmd->SCp.buffer = NULL;
|
|
cmd->SCp.this_residual = 0;
|
|
cmd->SCp.ptr = NULL;
|
|
}
|
|
cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
|
|
cmd->SCp.phase++;
|
|
/* fall through */
|
|
|
|
case 5: /* Phase 5 - Data transfer stage */
|
|
w_ctr(ppb, 0x0c);
|
|
if (!(r_str(ppb) & 0x80))
|
|
return 1;
|
|
|
|
retv = ppa_completion(cmd);
|
|
if (retv == -1)
|
|
return 0;
|
|
if (retv == 0)
|
|
return 1;
|
|
cmd->SCp.phase++;
|
|
/* fall through */
|
|
|
|
case 6: /* Phase 6 - Read status/message */
|
|
cmd->result = DID_OK << 16;
|
|
/* Check for data overrun */
|
|
if (ppa_wait(dev) != (unsigned char) 0xf0) {
|
|
ppa_fail(dev, DID_ERROR);
|
|
return 0;
|
|
}
|
|
if (ppa_in(dev, &l, 1)) { /* read status byte */
|
|
/* Check for optional message byte */
|
|
if (ppa_wait(dev) == (unsigned char) 0xf0)
|
|
ppa_in(dev, &h, 1);
|
|
cmd->result =
|
|
(DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
|
|
}
|
|
return 0; /* Finished */
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_ERR "ppa: Invalid scsi phase\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ppa_queuecommand_lck(struct scsi_cmnd *cmd,
|
|
void (*done) (struct scsi_cmnd *))
|
|
{
|
|
ppa_struct *dev = ppa_dev(cmd->device->host);
|
|
|
|
if (dev->cur_cmd) {
|
|
printk(KERN_ERR "PPA: bug in ppa_queuecommand\n");
|
|
return 0;
|
|
}
|
|
dev->failed = 0;
|
|
dev->jstart = jiffies;
|
|
dev->cur_cmd = cmd;
|
|
cmd->scsi_done = done;
|
|
cmd->result = DID_ERROR << 16; /* default return code */
|
|
cmd->SCp.phase = 0; /* bus free */
|
|
|
|
schedule_delayed_work(&dev->ppa_tq, 0);
|
|
|
|
ppa_pb_claim(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static DEF_SCSI_QCMD(ppa_queuecommand)
|
|
|
|
/*
|
|
* Apparently the disk->capacity attribute is off by 1 sector
|
|
* for all disk drives. We add the one here, but it should really
|
|
* be done in sd.c. Even if it gets fixed there, this will still
|
|
* work.
|
|
*/
|
|
static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev,
|
|
sector_t capacity, int ip[])
|
|
{
|
|
ip[0] = 0x40;
|
|
ip[1] = 0x20;
|
|
ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
|
|
if (ip[2] > 1024) {
|
|
ip[0] = 0xff;
|
|
ip[1] = 0x3f;
|
|
ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]);
|
|
if (ip[2] > 1023)
|
|
ip[2] = 1023;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ppa_abort(struct scsi_cmnd *cmd)
|
|
{
|
|
ppa_struct *dev = ppa_dev(cmd->device->host);
|
|
/*
|
|
* There is no method for aborting commands since Iomega
|
|
* have tied the SCSI_MESSAGE line high in the interface
|
|
*/
|
|
|
|
switch (cmd->SCp.phase) {
|
|
case 0: /* Do not have access to parport */
|
|
case 1: /* Have not connected to interface */
|
|
dev->cur_cmd = NULL; /* Forget the problem */
|
|
return SUCCESS;
|
|
break;
|
|
default: /* SCSI command sent, can not abort */
|
|
return FAILED;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void ppa_reset_pulse(unsigned int base)
|
|
{
|
|
w_dtr(base, 0x40);
|
|
w_ctr(base, 0x8);
|
|
udelay(30);
|
|
w_ctr(base, 0xc);
|
|
}
|
|
|
|
static int ppa_reset(struct scsi_cmnd *cmd)
|
|
{
|
|
ppa_struct *dev = ppa_dev(cmd->device->host);
|
|
|
|
if (cmd->SCp.phase)
|
|
ppa_disconnect(dev);
|
|
dev->cur_cmd = NULL; /* Forget the problem */
|
|
|
|
ppa_connect(dev, CONNECT_NORMAL);
|
|
ppa_reset_pulse(dev->base);
|
|
mdelay(1); /* device settle delay */
|
|
ppa_disconnect(dev);
|
|
mdelay(1); /* device settle delay */
|
|
return SUCCESS;
|
|
}
|
|
|
|
static int device_check(ppa_struct *dev)
|
|
{
|
|
/* 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. */
|
|
|
|
static u8 cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
|
|
int loop, old_mode, status, k, ppb = dev->base;
|
|
unsigned char l;
|
|
|
|
old_mode = dev->mode;
|
|
for (loop = 0; loop < 8; loop++) {
|
|
/* Attempt to use EPP for Test Unit Ready */
|
|
if ((ppb & 0x0007) == 0x0000)
|
|
dev->mode = PPA_EPP_32;
|
|
|
|
second_pass:
|
|
ppa_connect(dev, CONNECT_EPP_MAYBE);
|
|
/* Select SCSI device */
|
|
if (!ppa_select(dev, loop)) {
|
|
ppa_disconnect(dev);
|
|
continue;
|
|
}
|
|
printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n",
|
|
loop, PPA_MODE_STRING[dev->mode]);
|
|
|
|
/* Send SCSI command */
|
|
status = 1;
|
|
w_ctr(ppb, 0x0c);
|
|
for (l = 0; (l < 6) && (status); l++)
|
|
status = ppa_out(dev, cmd, 1);
|
|
|
|
if (!status) {
|
|
ppa_disconnect(dev);
|
|
ppa_connect(dev, CONNECT_EPP_MAYBE);
|
|
w_dtr(ppb, 0x40);
|
|
w_ctr(ppb, 0x08);
|
|
udelay(30);
|
|
w_ctr(ppb, 0x0c);
|
|
udelay(1000);
|
|
ppa_disconnect(dev);
|
|
udelay(1000);
|
|
if (dev->mode == PPA_EPP_32) {
|
|
dev->mode = old_mode;
|
|
goto second_pass;
|
|
}
|
|
return -EIO;
|
|
}
|
|
w_ctr(ppb, 0x0c);
|
|
k = 1000000; /* 1 Second */
|
|
do {
|
|
l = r_str(ppb);
|
|
k--;
|
|
udelay(1);
|
|
} while (!(l & 0x80) && (k));
|
|
|
|
l &= 0xf0;
|
|
|
|
if (l != 0xf0) {
|
|
ppa_disconnect(dev);
|
|
ppa_connect(dev, CONNECT_EPP_MAYBE);
|
|
ppa_reset_pulse(ppb);
|
|
udelay(1000);
|
|
ppa_disconnect(dev);
|
|
udelay(1000);
|
|
if (dev->mode == PPA_EPP_32) {
|
|
dev->mode = old_mode;
|
|
goto second_pass;
|
|
}
|
|
return -EIO;
|
|
}
|
|
ppa_disconnect(dev);
|
|
printk(KERN_INFO "ppa: Communication established with ID %i using %s\n",
|
|
loop, PPA_MODE_STRING[dev->mode]);
|
|
ppa_connect(dev, CONNECT_EPP_MAYBE);
|
|
ppa_reset_pulse(ppb);
|
|
udelay(1000);
|
|
ppa_disconnect(dev);
|
|
udelay(1000);
|
|
return 0;
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int ppa_adjust_queue(struct scsi_device *device)
|
|
{
|
|
blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH);
|
|
return 0;
|
|
}
|
|
|
|
static struct scsi_host_template ppa_template = {
|
|
.module = THIS_MODULE,
|
|
.proc_name = "ppa",
|
|
.show_info = ppa_show_info,
|
|
.write_info = ppa_write_info,
|
|
.name = "Iomega VPI0 (ppa) interface",
|
|
.queuecommand = ppa_queuecommand,
|
|
.eh_abort_handler = ppa_abort,
|
|
.eh_host_reset_handler = ppa_reset,
|
|
.bios_param = ppa_biosparam,
|
|
.this_id = -1,
|
|
.sg_tablesize = SG_ALL,
|
|
.use_clustering = ENABLE_CLUSTERING,
|
|
.can_queue = 1,
|
|
.slave_alloc = ppa_adjust_queue,
|
|
};
|
|
|
|
/***************************************************************************
|
|
* Parallel port probing routines *
|
|
***************************************************************************/
|
|
|
|
static LIST_HEAD(ppa_hosts);
|
|
|
|
/*
|
|
* Finds the first available device number that can be alloted to the
|
|
* new ppa device and returns the address of the previous node so that
|
|
* we can add to the tail and have a list in the ascending order.
|
|
*/
|
|
|
|
static inline ppa_struct *find_parent(void)
|
|
{
|
|
ppa_struct *dev, *par = NULL;
|
|
unsigned int cnt = 0;
|
|
|
|
if (list_empty(&ppa_hosts))
|
|
return NULL;
|
|
|
|
list_for_each_entry(dev, &ppa_hosts, list) {
|
|
if (dev->dev_no != cnt)
|
|
return par;
|
|
cnt++;
|
|
par = dev;
|
|
}
|
|
|
|
return par;
|
|
}
|
|
|
|
static int __ppa_attach(struct parport *pb)
|
|
{
|
|
struct Scsi_Host *host;
|
|
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting);
|
|
DEFINE_WAIT(wait);
|
|
ppa_struct *dev, *temp;
|
|
int ports;
|
|
int modes, ppb, ppb_hi;
|
|
int err = -ENOMEM;
|
|
struct pardev_cb ppa_cb;
|
|
|
|
dev = kzalloc(sizeof(ppa_struct), GFP_KERNEL);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
dev->base = -1;
|
|
dev->mode = PPA_AUTODETECT;
|
|
dev->recon_tmo = PPA_RECON_TMO;
|
|
init_waitqueue_head(&waiting);
|
|
temp = find_parent();
|
|
if (temp)
|
|
dev->dev_no = temp->dev_no + 1;
|
|
|
|
memset(&ppa_cb, 0, sizeof(ppa_cb));
|
|
ppa_cb.private = dev;
|
|
ppa_cb.wakeup = ppa_wakeup;
|
|
|
|
dev->dev = parport_register_dev_model(pb, "ppa", &ppa_cb, dev->dev_no);
|
|
|
|
if (!dev->dev)
|
|
goto out;
|
|
|
|
/* Claim the bus so it remembers what we do to the control
|
|
* registers. [ CTR and ECP ]
|
|
*/
|
|
err = -EBUSY;
|
|
dev->waiting = &waiting;
|
|
prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE);
|
|
if (ppa_pb_claim(dev))
|
|
schedule_timeout(3 * HZ);
|
|
if (dev->wanted) {
|
|
printk(KERN_ERR "ppa%d: failed to claim parport because "
|
|
"a pardevice is owning the port for too long "
|
|
"time!\n", pb->number);
|
|
ppa_pb_dismiss(dev);
|
|
dev->waiting = NULL;
|
|
finish_wait(&waiting, &wait);
|
|
goto out1;
|
|
}
|
|
dev->waiting = NULL;
|
|
finish_wait(&waiting, &wait);
|
|
ppb = dev->base = dev->dev->port->base;
|
|
ppb_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 = PPA_NIBBLE;
|
|
|
|
if (modes & PARPORT_MODE_TRISTATE)
|
|
dev->mode = PPA_PS2;
|
|
|
|
if (modes & PARPORT_MODE_ECP) {
|
|
w_ecr(ppb_hi, 0x20);
|
|
dev->mode = PPA_PS2;
|
|
}
|
|
if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP))
|
|
w_ecr(ppb_hi, 0x80);
|
|
|
|
/* Done configuration */
|
|
|
|
err = ppa_init(dev);
|
|
ppa_pb_release(dev);
|
|
|
|
if (err)
|
|
goto out1;
|
|
|
|
/* now the glue ... */
|
|
if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2)
|
|
ports = 3;
|
|
else
|
|
ports = 8;
|
|
|
|
INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt);
|
|
|
|
err = -ENOMEM;
|
|
host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *));
|
|
if (!host)
|
|
goto out1;
|
|
host->io_port = pb->base;
|
|
host->n_io_port = ports;
|
|
host->dma_channel = -1;
|
|
host->unique_id = pb->number;
|
|
*(ppa_struct **)&host->hostdata = dev;
|
|
dev->host = host;
|
|
list_add_tail(&dev->list, &ppa_hosts);
|
|
err = scsi_add_host(host, NULL);
|
|
if (err)
|
|
goto out2;
|
|
scsi_scan_host(host);
|
|
return 0;
|
|
out2:
|
|
list_del_init(&dev->list);
|
|
scsi_host_put(host);
|
|
out1:
|
|
parport_unregister_device(dev->dev);
|
|
out:
|
|
kfree(dev);
|
|
return err;
|
|
}
|
|
|
|
static void ppa_attach(struct parport *pb)
|
|
{
|
|
__ppa_attach(pb);
|
|
}
|
|
|
|
static void ppa_detach(struct parport *pb)
|
|
{
|
|
ppa_struct *dev;
|
|
list_for_each_entry(dev, &ppa_hosts, list) {
|
|
if (dev->dev->port == pb) {
|
|
list_del_init(&dev->list);
|
|
scsi_remove_host(dev->host);
|
|
scsi_host_put(dev->host);
|
|
parport_unregister_device(dev->dev);
|
|
kfree(dev);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct parport_driver ppa_driver = {
|
|
.name = "ppa",
|
|
.match_port = ppa_attach,
|
|
.detach = ppa_detach,
|
|
.devmodel = true,
|
|
};
|
|
|
|
static int __init ppa_driver_init(void)
|
|
{
|
|
printk(KERN_INFO "ppa: Version %s\n", PPA_VERSION);
|
|
return parport_register_driver(&ppa_driver);
|
|
}
|
|
|
|
static void __exit ppa_driver_exit(void)
|
|
{
|
|
parport_unregister_driver(&ppa_driver);
|
|
}
|
|
|
|
module_init(ppa_driver_init);
|
|
module_exit(ppa_driver_exit);
|
|
MODULE_LICENSE("GPL");
|