patch-2.1.122 linux/drivers/scsi/imm.c
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- Lines: 1322
- Date:
Mon Sep 14 11:11:44 1998
- Orig file:
v2.1.121/linux/drivers/scsi/imm.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.1.121/linux/drivers/scsi/imm.c linux/drivers/scsi/imm.c
@@ -0,0 +1,1321 @@
+/* imm.c -- low level driver for the IOMEGA MatchMaker
+ * parallel port SCSI host adapter.
+ *
+ * (The IMM is the embedded controller in the ZIP Plus drive.)
+ *
+ * Current Maintainer: David Campbell (Perth, Western Australia)
+ * campbell@gear.torque.net
+ * dcampbel@p01.as17.honeywell.com.au
+ *
+ * My unoffical company acronym list is 21 pages long:
+ * FLA: Four letter acronym with built in facility for
+ * future expansion to five letters.
+ */
+
+#include <linux/config.h>
+
+/* The following #define is to avoid a clash with hosts.c */
+#define IMM_CODE 1
+#define IMM_PROBE_SPP 0x0001
+#define IMM_PROBE_PS2 0x0002
+#define IMM_PROBE_ECR 0x0010
+#define IMM_PROBE_EPP17 0x0100
+#define IMM_PROBE_EPP19 0x0200
+
+void imm_reset_pulse(unsigned int base);
+static int device_check(int host_no);
+
+#include <linux/blk.h>
+#include <asm/io.h>
+#include <linux/parport.h>
+#include "sd.h"
+#include "hosts.h"
+typedef struct {
+ struct pardevice *dev; /* Parport device entry */
+ int base; /* Actual port address */
+ int mode; /* Transfer mode */
+ int host; /* Host number (for proc) */
+ Scsi_Cmnd *cur_cmd; /* Current queued command */
+ struct tq_struct imm_tq; /* Polling interupt stuff */
+ unsigned long jstart; /* Jiffies at start */
+ unsigned failed:1; /* Failure flag */
+ unsigned dp:1; /* Data phase present */
+ unsigned rd:1; /* Read data in data phase */
+ unsigned p_busy:1; /* Parport sharing busy flag */
+} imm_struct;
+
+#define IMM_EMPTY \
+{ dev: NULL, \
+ base: -1, \
+ mode: IMM_AUTODETECT, \
+ host: -1, \
+ cur_cmd: NULL, \
+ imm_tq: {0, 0, imm_interrupt, NULL}, \
+ jstart: 0, \
+ failed: 0, \
+ dp: 0, \
+ rd: 0, \
+ p_busy: 0 \
+}
+
+#include "imm.h"
+#define NO_HOSTS 4
+static imm_struct imm_hosts[NO_HOSTS] =
+{IMM_EMPTY, IMM_EMPTY, IMM_EMPTY, IMM_EMPTY};
+
+#define IMM_BASE(x) imm_hosts[(x)].base
+
+int base[NO_HOSTS] =
+{0x03bc, 0x0378, 0x0278, 0x0000};
+
+void imm_wakeup(void *ref)
+{
+ imm_struct *imm_dev = (imm_struct *) ref;
+
+ if (!imm_dev->p_busy)
+ return;
+
+ if (parport_claim(imm_dev->dev)) {
+ printk("imm: bug in imm_wakeup\n");
+ return;
+ }
+ imm_dev->p_busy = 0;
+ imm_dev->base = imm_dev->dev->port->base;
+ if (imm_dev->cur_cmd)
+ imm_dev->cur_cmd->SCp.phase++;
+ return;
+}
+
+int imm_release(struct Scsi_Host *host)
+{
+ int host_no = host->unique_id;
+
+ printk("Releasing imm%i\n", host_no);
+ parport_unregister_device(imm_hosts[host_no].dev);
+ return 0;
+}
+
+static int imm_pb_claim(int host_no)
+{
+ if (parport_claim(imm_hosts[host_no].dev)) {
+ imm_hosts[host_no].p_busy = 1;
+ return 1;
+ }
+
+ if (imm_hosts[host_no].cur_cmd)
+ imm_hosts[host_no].cur_cmd->SCp.phase++;
+ return 0;
+}
+
+#define imm_pb_release(x) parport_release(imm_hosts[(x)].dev)
+
+/***************************************************************************
+ * Parallel port probing routines *
+ ***************************************************************************/
+
+#ifndef MODULE
+/*
+ * Command line parameters (for built-in driver):
+ *
+ * Syntax: imm=base[,mode[,use_sg]]
+ *
+ * For example: imm=0x378 or imm=0x378,0,3
+ *
+ */
+
+void imm_setup(char *str, int *ints)
+{
+ static int x = 0;
+
+ if (x == 0) { /* Disable ALL known ports */
+ int i;
+
+ for (i = 0; i < NO_HOSTS; i++)
+ parbus_base[i] = 0x0000;
+ }
+ switch (ints[0]) {
+ case 3:
+ imm_sg = ints[3];
+ case 2:
+ imm_hosts[x].mode = ints[2];
+ parbus_base[x] = ints[1];
+ break;
+ default:
+ printk("IMM: I only use between 2 to 3 parameters.\n");
+ break;
+ }
+ x++;
+}
+#else
+Scsi_Host_Template driver_template = IMM;
+#include "scsi_module.c"
+#endif
+
+int imm_detect(Scsi_Host_Template * host)
+{
+ struct Scsi_Host *hreg;
+ int ports;
+ int i, nhosts, try_again;
+ struct parport *pb = parport_enumerate();
+
+ printk("imm: Version %s\n", IMM_VERSION);
+ nhosts = 0;
+ try_again = 0;
+
+ if (!pb) {
+ printk("imm: parport reports no devices.\n");
+ return 0;
+ }
+
+ retry_entry:
+ for (i = 0; pb; i++, pb = pb->next) {
+ int modes, ppb;
+
+ imm_hosts[i].dev =
+ parport_register_device(pb, "imm", NULL, imm_wakeup,
+ NULL, PARPORT_DEV_TRAN, (void *) &imm_hosts[i]);
+
+ /* Claim the bus so it remembers what we do to the control
+ * registers. [ CTR and ECP ]
+ */
+ if (imm_pb_claim(i))
+ while (imm_hosts[i].p_busy)
+ schedule(); /* We are safe to schedule here */
+
+ ppb = IMM_BASE(i) = imm_hosts[i].dev->port->base;
+ w_ctr(ppb, 0x0c);
+ modes = imm_hosts[i].dev->port->modes;
+
+ /* Mode detection works up the chain of speed
+ * This avoids a nasty if-then-else-if-... tree
+ */
+ imm_hosts[i].mode = IMM_NIBBLE;
+
+ if (modes & PARPORT_MODE_PCPS2)
+ imm_hosts[i].mode = IMM_PS2;
+
+ if (modes & PARPORT_MODE_PCECPPS2) {
+ w_ecr(ppb, 0x20);
+ imm_hosts[i].mode = IMM_PS2;
+ }
+ if (modes & PARPORT_MODE_PCECPEPP)
+ w_ecr(ppb, 0x80);
+
+ /* Done configuration */
+ imm_pb_release(i);
+
+ if (imm_init(i)) {
+ parport_unregister_device(imm_hosts[i].dev);
+ continue;
+ }
+ /* now the glue ... */
+ switch (imm_hosts[i].mode) {
+ case IMM_NIBBLE:
+ ports = 3;
+ break;
+ case IMM_PS2:
+ ports = 3;
+ break;
+ case IMM_EPP_8:
+ case IMM_EPP_16:
+ case IMM_EPP_32:
+ ports = 8;
+ break;
+ default: /* Never gets here */
+ continue;
+ }
+
+ host->can_queue = IMM_CAN_QUEUE;
+ host->sg_tablesize = imm_sg;
+ hreg = scsi_register(host, 0);
+ hreg->io_port = pb->base;
+ hreg->n_io_port = ports;
+ hreg->dma_channel = -1;
+ hreg->unique_id = i;
+ imm_hosts[i].host = hreg->host_no;
+ nhosts++;
+ }
+ if (nhosts == 0) {
+ if (try_again == 1)
+ return 0;
+ try_again = 1;
+ goto retry_entry;
+ } else
+ return 1; /* return number of hosts detected */
+}
+
+/* This is to give the imm driver a way to modify the timings (and other
+ * parameters) by writing to the /proc/scsi/imm/0 file.
+ * Very simple method really... (To simple, no error checking :( )
+ * Reason: Kernel hackers HATE having to unload and reload modules for
+ * testing...
+ * Also gives a method to use a script to obtain optimum timings (TODO)
+ */
+
+static inline int imm_strncmp(const char *a, const char *b, int len)
+{
+ int loop;
+ for (loop = 0; loop < len; loop++)
+ if (a[loop] != b[loop])
+ return 1;
+
+ return 0;
+}
+
+static inline int imm_proc_write(int hostno, char *buffer, int length)
+{
+ unsigned long x;
+
+ if ((length > 5) && (imm_strncmp(buffer, "mode=", 5) == 0)) {
+ x = simple_strtoul(buffer + 5, NULL, 0);
+ imm_hosts[hostno].mode = x;
+ return length;
+ }
+ printk("imm /proc: invalid variable\n");
+ return (-EINVAL);
+}
+
+int imm_proc_info(char *buffer, char **start, off_t offset,
+ int length, int hostno, int inout)
+{
+ int i;
+ int len = 0;
+
+ for (i = 0; i < 4; i++)
+ if (imm_hosts[i].host == hostno)
+ break;
+
+ if (inout)
+ return imm_proc_write(i, buffer, length);
+
+ len += sprintf(buffer + len, "Version : %s\n", IMM_VERSION);
+ len += sprintf(buffer + len, "Parport : %s\n", imm_hosts[i].dev->port->name);
+ len += sprintf(buffer + len, "Mode : %s\n", IMM_MODE_STRING[imm_hosts[i].mode]);
+
+ /* Request for beyond end of buffer */
+ if (offset > len)
+ return 0;
+
+ *start = buffer + offset;
+ len -= offset;
+ if (len > length)
+ len = length;
+ return len;
+}
+
+#if IMM_DEBUG > 0
+#define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\
+ y, __FUNCTION__, __LINE__); imm_fail_func(x,y);
+static inline void imm_fail_func(int host_no, int error_code)
+#else
+static inline void imm_fail(int host_no, int error_code)
+#endif
+{
+ /* If we fail a device then we trash status / message bytes */
+ if (imm_hosts[host_no].cur_cmd) {
+ imm_hosts[host_no].cur_cmd->result = error_code << 16;
+ imm_hosts[host_no].failed = 1;
+ }
+}
+
+/*
+ * Wait for the high bit to be set.
+ *
+ * In principle, this could be tied to an interrupt, but the adapter
+ * doesn't appear to be designed to support interrupts. We spin on
+ * the 0x80 ready bit.
+ */
+static unsigned char imm_wait(int host_no)
+{
+ int k;
+ unsigned short ppb = IMM_BASE(host_no);
+ unsigned char r;
+
+ w_ctr(ppb, 0x0c);
+
+ k = IMM_SPIN_TMO;
+ do {
+ r = r_str(ppb);
+ k--;
+ udelay(1);
+ }
+ while (!(r & 0x80) && (k));
+
+ /*
+ * STR register (LPT base+1) to SCSI mapping:
+ *
+ * STR imm imm
+ * ===================================
+ * 0x80 S_REQ S_REQ
+ * 0x40 !S_BSY (????)
+ * 0x20 !S_CD !S_CD
+ * 0x10 !S_IO !S_IO
+ * 0x08 (????) !S_BSY
+ *
+ * imm imm meaning
+ * ==================================
+ * 0xf0 0xb8 Bit mask
+ * 0xc0 0x88 ZIP wants more data
+ * 0xd0 0x98 ZIP wants to send more data
+ * 0xe0 0xa8 ZIP is expecting SCSI command data
+ * 0xf0 0xb8 end of transfer, ZIP is sending status
+ */
+ w_ctr(ppb, 0x04);
+ if (k)
+ return (r & 0xb8);
+
+ /* Counter expired - Time out occured */
+ imm_fail(host_no, DID_TIME_OUT);
+ printk("imm timeout in imm_wait\n");
+ return 0; /* command timed out */
+}
+
+static int imm_negotiate(imm_struct * tmp)
+{
+ /*
+ * The following is supposedly the IEEE 1248-1994 negotiate
+ * sequence. I have yet to obtain a copy of the above standard
+ * so this is a bit of a guess...
+ *
+ * A fair chunk of this is based on the Linux parport implementation
+ * of IEEE 1284.
+ *
+ * Return 0 if data available
+ * 1 if no data available
+ */
+
+ unsigned short base = tmp->base;
+ unsigned char a, mode;
+
+ switch (tmp->mode) {
+ case IMM_NIBBLE:
+ mode = 0x00;
+ break;
+ case IMM_PS2:
+ mode = 0x01;
+ break;
+ default:
+ return 0;
+ }
+
+ w_ctr(base, 0x04);
+ udelay(5);
+ w_dtr(base, mode);
+ udelay(100);
+ w_ctr(base, 0x06);
+ udelay(5);
+ a = (r_str(base) & 0x20) ? 0 : 1;
+ udelay(5);
+ w_ctr(base, 0x07);
+ udelay(5);
+ w_ctr(base, 0x06);
+
+ if (a) {
+ printk("IMM: IEEE1284 negotiate indicates no data available.\n");
+ imm_fail(tmp->host, DID_ERROR);
+ }
+ return a;
+}
+
+static inline void epp_reset(unsigned short ppb)
+{
+ int i;
+
+ i = r_str(ppb);
+ w_str(ppb, i);
+ w_str(ppb, i & 0xfe);
+}
+
+static inline void ecp_sync(unsigned short ppb)
+{
+ int i;
+
+ if ((r_ecr(ppb) & 0xe0) != 0x80)
+ return;
+
+ for (i = 0; i < 100; i++) {
+ if (r_ecr(ppb) & 0x01)
+ return;
+ udelay(5);
+ }
+ printk("imm: ECP sync failed as data still present in FIFO.\n");
+}
+
+static inline int imm_byte_out(unsigned short base, const char *buffer, int len)
+{
+ int i;
+
+ w_ctr(base, 0x4); /* aimmrently a sane mode */
+ for (i = len >> 1; i; i--) {
+ w_dtr(base, *buffer++);
+ w_ctr(base, 0x5); /* Drop STROBE low */
+ w_dtr(base, *buffer++);
+ w_ctr(base, 0x0); /* STROBE high + INIT low */
+ }
+ w_ctr(base, 0x4); /* aimmrently a sane mode */
+ return 1; /* All went well - we hope! */
+}
+
+static inline int imm_epp_out(unsigned short base, char *buffer, int len)
+{
+ int i;
+ for (i = len; i; i--)
+ w_epp(base, *buffer++);
+ return 1;
+}
+
+static inline int imm_nibble_in(unsigned short base, char *buffer, int len)
+{
+ unsigned char h, l;
+ int i;
+
+ /*
+ * The following is based on documented timing signals
+ */
+ w_ctr(base, 0x4);
+ for (i = len; i; i--) {
+ w_ctr(base, 0x6);
+ l = r_str(base);
+ w_ctr(base, 0x5);
+ h = r_str(base);
+ w_ctr(base, 0x4);
+ *buffer++ = (h & 0xf0) | ((l & 0xf0) >> 4);
+ }
+ return 1; /* All went well - we hope! */
+}
+
+static inline int imm_byte_in(unsigned short base, char *buffer, int len)
+{
+ int i;
+
+ /*
+ * The following is based on documented timing signals
+ */
+ w_ctr(base, 0x4);
+ for (i = len; i; i--) {
+ w_ctr(base, 0x26);
+ *buffer++ = r_dtr(base);
+ w_ctr(base, 0x25);
+ }
+ return 1; /* All went well - we hope! */
+}
+
+static inline int imm_epp_in(unsigned short base, char *buffer, int len)
+{
+ int i;
+ for (i = len; i; i--)
+ *buffer++ = r_epp(base);
+ return 1;
+}
+
+static int imm_out(int host_no, char *buffer, int len)
+{
+ int r;
+ unsigned short ppb = IMM_BASE(host_no);
+
+ r = imm_wait(host_no);
+
+ /*
+ * Make sure that:
+ * a) the SCSI bus is BUSY (device still listening)
+ * b) the device is listening
+ */
+ if ((r & 0x18) != 0x08) {
+ imm_fail(host_no, DID_ERROR);
+ printk("IMM: returned SCSI status %2x\n", r);
+ return 0;
+ }
+ switch (imm_hosts[host_no].mode) {
+ case IMM_EPP_32:
+ case IMM_EPP_16:
+ case IMM_EPP_8:
+ epp_reset(ppb);
+ w_ctr(ppb, 0x4);
+ r = imm_epp_out(ppb, buffer, len);
+ w_ctr(ppb, 0xc);
+ ecp_sync(ppb);
+ break;
+
+ case IMM_NIBBLE:
+ case IMM_PS2:
+ /* 8 bit output, with a loop */
+ r = imm_byte_out(ppb, buffer, len);
+ break;
+
+ default:
+ printk("IMM: bug in imm_out()\n");
+ r = 0;
+ }
+ return r;
+}
+
+static int imm_in(int host_no, char *buffer, int len)
+{
+ int r;
+ unsigned short ppb = IMM_BASE(host_no);
+
+ r = imm_wait(host_no);
+
+ /*
+ * Make sure that:
+ * a) the SCSI bus is BUSY (device still listening)
+ * b) the device is sending data
+ */
+ if ((r & 0x18) != 0x18) {
+ imm_fail(host_no, DID_ERROR);
+ return 0;
+ }
+ switch (imm_hosts[host_no].mode) {
+ case IMM_NIBBLE:
+ /* 4 bit input, with a loop */
+ r = imm_nibble_in(ppb, buffer, len);
+ w_ctr(ppb, 0xc);
+ break;
+
+ case IMM_PS2:
+ /* 8 bit input, with a loop */
+ r = imm_byte_in(ppb, buffer, len);
+ w_ctr(ppb, 0xc);
+ break;
+
+ case IMM_EPP_32:
+ case IMM_EPP_16:
+ case IMM_EPP_8:
+ epp_reset(ppb);
+ w_ctr(ppb, 0x24);
+ r = imm_epp_in(ppb, buffer, len);
+ w_ctr(ppb, 0x2c);
+ ecp_sync(ppb);
+ break;
+
+ default:
+ printk("IMM: bug in imm_ins()\n");
+ r = 0;
+ break;
+ }
+ return r;
+}
+
+static int imm_cpp(unsigned short ppb, unsigned char b)
+{
+ /*
+ * Comments on udelay values refer to the
+ * Command Packet Protocol (CPP) timing diagram.
+ */
+
+ unsigned char s1, s2, s3;
+ w_ctr(ppb, 0x0c);
+ udelay(2); /* 1 usec - infinite */
+ w_dtr(ppb, 0xaa);
+ udelay(10); /* 7 usec - infinite */
+ w_dtr(ppb, 0x55);
+ udelay(10); /* 7 usec - infinite */
+ w_dtr(ppb, 0x00);
+ udelay(10); /* 7 usec - infinite */
+ w_dtr(ppb, 0xff);
+ udelay(10); /* 7 usec - infinite */
+ s1 = r_str(ppb) & 0xb8;
+ w_dtr(ppb, 0x87);
+ udelay(10); /* 7 usec - infinite */
+ s2 = r_str(ppb) & 0xb8;
+ w_dtr(ppb, 0x78);
+ udelay(10); /* 7 usec - infinite */
+ s3 = r_str(ppb) & 0x38;
+ /*
+ * Values for b are:
+ * 0000 00aa Assign address aa to current device
+ * 0010 00aa Select device aa in EPP Winbond mode
+ * 0010 10aa Select device aa in EPP mode
+ * 0011 xxxx Deselect all devices
+ * 0110 00aa Test device aa
+ * 1101 00aa Select device aa in ECP mode
+ * 1110 00aa Select device aa in Compatible mode
+ */
+ w_dtr(ppb, b);
+ udelay(2); /* 1 usec - infinite */
+ w_ctr(ppb, 0x0c);
+ udelay(10); /* 7 usec - infinite */
+ w_ctr(ppb, 0x0d);
+ udelay(2); /* 1 usec - infinite */
+ w_ctr(ppb, 0x0c);
+ udelay(10); /* 7 usec - infinite */
+ w_dtr(ppb, 0xff);
+ udelay(10); /* 7 usec - infinite */
+
+ /*
+ * The following table is electrical pin values.
+ * (BSY is inverted at the CTR register)
+ *
+ * BSY ACK POut SEL Fault
+ * S1 0 X 1 1 1
+ * S2 1 X 0 1 1
+ * S3 L X 1 1 S
+ *
+ * L => Last device in chain
+ * S => Selected
+ *
+ * Observered values for S1,S2,S3 are:
+ * Disconnect => f8/58/78
+ * Connect => f8/58/70
+ */
+ if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x30))
+ return 1; /* Connected */
+ if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x38))
+ return 0; /* Disconnected */
+
+ return -1; /* No device present */
+}
+
+static inline int imm_connect(int host_no, int flag)
+{
+ unsigned short ppb = IMM_BASE(host_no);
+
+ imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
+ imm_cpp(ppb, 0x30); /* Disconnect all devices */
+
+ if ((imm_hosts[host_no].mode == IMM_EPP_8) ||
+ (imm_hosts[host_no].mode == IMM_EPP_16) ||
+ (imm_hosts[host_no].mode == IMM_EPP_32))
+ return imm_cpp(ppb, 0x28); /* Select device 0 in EPP mode */
+ return imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
+}
+
+static void imm_disconnect(int host_no)
+{
+ unsigned short ppb = IMM_BASE(host_no);
+
+ imm_cpp(ppb, 0x30); /* Disconnect all devices */
+}
+
+static int imm_select(int host_no, int target)
+{
+ int k;
+ unsigned short ppb = IMM_BASE(host_no);
+
+ /*
+ * Firstly we want to make sure there is nothing
+ * holding onto the SCSI bus.
+ */
+ w_ctr(ppb, 0xc);
+
+ k = IMM_SELECT_TMO;
+ do {
+ k--;
+ } while ((r_str(ppb) & 0x08) && (k));
+
+ if (!k)
+ return 0;
+
+ /*
+ * Now assert the SCSI ID (HOST and TARGET) on the data bus
+ */
+ w_ctr(ppb, 0x4);
+ w_dtr(ppb, 0x80 | (1 << target));
+ udelay(1);
+
+ /*
+ * Deassert SELIN first followed by STROBE
+ */
+ w_ctr(ppb, 0xc);
+ w_ctr(ppb, 0xd);
+
+ /*
+ * ACK should drop low while SELIN is deasserted.
+ * FAULT should drop low when the SCSI device latches the bus.
+ */
+ k = IMM_SELECT_TMO;
+ do {
+ k--;
+ }
+ while (!(r_str(ppb) & 0x08) && (k));
+
+ /*
+ * Place the interface back into a sane state (status mode)
+ */
+ w_ctr(ppb, 0xc);
+ return (k) ? 1 : 0;
+}
+
+static int imm_init(int host_no)
+{
+ int retv;
+
+#if defined(CONFIG_PARPORT) || defined(CONFIG_PARPORT_MODULE)
+ if (imm_pb_claim(host_no))
+ while (imm_hosts[host_no].p_busy)
+ schedule(); /* We can safe schedule here */
+#endif
+ retv = imm_connect(host_no, 0);
+
+ if (retv == 1) {
+ imm_reset_pulse(IMM_BASE(host_no));
+ udelay(1000); /* Delay to allow devices to settle */
+ imm_disconnect(host_no);
+ udelay(1000); /* Another delay to allow devices to settle */
+ retv = device_check(host_no);
+ imm_pb_release(host_no);
+ return retv;
+ }
+
+ imm_pb_release(host_no);
+ return 1;
+}
+
+static inline int imm_send_command(Scsi_Cmnd * cmd)
+{
+ int host_no = cmd->host->unique_id;
+ int k;
+
+ /* NOTE: IMM uses byte pairs */
+ for (k = 0; k < cmd->cmd_len; k += 2)
+ if (!imm_out(host_no, &cmd->cmnd[k], 2))
+ return 0;
+ return 1;
+}
+
+/*
+ * The bulk flag enables some optimisations in the data transfer loops,
+ * it should be true for any command that transfers data in integral
+ * numbers of sectors.
+ *
+ * The driver appears to remain stable if we speed up the parallel port
+ * i/o in this function, but not elsewhere.
+ */
+static int imm_completion(Scsi_Cmnd * cmd)
+{
+ /* Return codes:
+ * -1 Error
+ * 0 Told to schedule
+ * 1 Finished data transfer
+ */
+ int host_no = cmd->host->unique_id;
+ unsigned short ppb = IMM_BASE(host_no);
+ 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 imm_wait.
+ */
+ w_ctr(ppb, 0x0c);
+ r = (r_str(ppb) & 0xb8);
+
+ /*
+ * while (device is not ready to send status byte)
+ * loop;
+ */
+ while (r != (unsigned char) 0xb8) {
+ /*
+ * If we have been running for more than a full timer tick
+ * then take a rest.
+ */
+ if (jiffies > start_jiffies + 1)
+ return 0;
+
+ /*
+ * FAIL if:
+ * a) Drive status is screwy (!ready && !present)
+ * b) Drive is requesting/sending more data than expected
+ */
+ if (((r & 0x88) != 0x88) || (cmd->SCp.this_residual <= 0)) {
+ imm_fail(host_no, DID_ERROR);
+ return -1; /* ERROR_RETURN */
+ }
+ /* determine if we should use burst I/O */
+ if (imm_hosts[host_no].rd == 0) {
+ fast = (bulk && (cmd->SCp.this_residual >= IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 2;
+ status = imm_out(host_no, cmd->SCp.ptr, fast);
+ } else {
+ fast = (bulk && (cmd->SCp.this_residual >= IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 1;
+ status = imm_in(host_no, cmd->SCp.ptr, fast);
+ }
+
+ cmd->SCp.ptr += fast;
+ cmd->SCp.this_residual -= fast;
+
+ if (!status) {
+ imm_fail(host_no, 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 = cmd->SCp.buffer->address;
+
+ /*
+ * Make sure that we transfer even number of bytes
+ * otherwise it makes imm_byte_out() messy.
+ */
+ if (cmd->SCp.this_residual & 0x01) {
+ cmd->SCp.this_residual++;
+ printk("IMM: adjusted buffer for 16 bit transfer\n");
+ }
+ }
+ }
+ /* Now check to see if the drive is ready to comunicate */
+ w_ctr(ppb, 0x0c);
+ r = (r_str(ppb) & 0xb8);
+
+ /* If not, drop back down to the scheduler and wait a timer tick */
+ if (!(r & 0x80))
+ return 0;
+ }
+ return 1; /* FINISH_RETURN */
+}
+
+/* deprecated synchronous interface */
+int imm_command(Scsi_Cmnd * cmd)
+{
+ static int first_pass = 1;
+ int host_no = cmd->host->unique_id;
+
+ if (first_pass) {
+ printk("imm: using non-queuing interface\n");
+ first_pass = 0;
+ }
+ if (imm_hosts[host_no].cur_cmd) {
+ printk("IMM: bug in imm_command\n");
+ return 0;
+ }
+ imm_hosts[host_no].failed = 0;
+ imm_hosts[host_no].jstart = jiffies;
+ imm_hosts[host_no].cur_cmd = cmd;
+ cmd->result = DID_ERROR << 16; /* default return code */
+ cmd->SCp.phase = 0;
+
+ imm_pb_claim(host_no);
+
+ while (imm_engine(&imm_hosts[host_no], cmd))
+ schedule();
+
+ if (cmd->SCp.phase) /* Only disconnect if we have connected */
+ imm_disconnect(cmd->host->unique_id);
+
+ imm_pb_release(host_no);
+ imm_hosts[host_no].cur_cmd = 0;
+ return cmd->result;
+}
+
+/*
+ * Since the IMM 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 imm_interrupt(void *data)
+{
+ imm_struct *tmp = (imm_struct *) data;
+ Scsi_Cmnd *cmd = tmp->cur_cmd;
+
+ if (!cmd) {
+ printk("IMM: bug in imm_interrupt\n");
+ return;
+ }
+ if (imm_engine(tmp, cmd)) {
+ tmp->imm_tq.data = (void *) tmp;
+ tmp->imm_tq.sync = 0;
+ queue_task(&tmp->imm_tq, &tq_timer);
+ return;
+ }
+ /* Command must of completed hence it is safe to let go... */
+#if IMM_DEBUG > 0
+ switch ((cmd->result >> 16) & 0xff) {
+ case DID_OK:
+ break;
+ case DID_NO_CONNECT:
+ printk("imm: no device at SCSI ID %i\n", cmd->target);
+ break;
+ case DID_BUS_BUSY:
+ printk("imm: BUS BUSY - EPP timeout detected\n");
+ break;
+ case DID_TIME_OUT:
+ printk("imm: unknown timeout\n");
+ break;
+ case DID_ABORT:
+ printk("imm: told to abort\n");
+ break;
+ case DID_PARITY:
+ printk("imm: parity error (???)\n");
+ break;
+ case DID_ERROR:
+ printk("imm: internal driver error\n");
+ break;
+ case DID_RESET:
+ printk("imm: told to reset device\n");
+ break;
+ case DID_BAD_INTR:
+ printk("imm: bad interrupt (???)\n");
+ break;
+ default:
+ printk("imm: bad return code (%02x)\n", (cmd->result >> 16) & 0xff);
+ }
+#endif
+
+ if (cmd->SCp.phase > 1)
+ imm_disconnect(cmd->host->unique_id);
+ if (cmd->SCp.phase > 0)
+ imm_pb_release(cmd->host->unique_id);
+
+ tmp->cur_cmd = 0;
+ cmd->scsi_done(cmd);
+ return;
+}
+
+static int imm_engine(imm_struct * tmp, Scsi_Cmnd * cmd)
+{
+ int host_no = cmd->host->unique_id;
+ unsigned short ppb = IMM_BASE(host_no);
+ unsigned char l = 0, h = 0;
+ int retv, x;
+
+ /* First check for any errors that may of occured
+ * Here we check for internal errors
+ */
+ if (tmp->failed)
+ return 0;
+
+ switch (cmd->SCp.phase) {
+ case 0: /* Phase 0 - Waiting for parport */
+ if ((jiffies - tmp->jstart) > HZ) {
+ /*
+ * We waited more than a second
+ * for parport to call us
+ */
+ imm_fail(host_no, DID_BUS_BUSY);
+ return 0;
+ }
+ return 1; /* wait until imm_wakeup claims parport */
+ /* Phase 1 - Connected */
+ case 1:
+ imm_connect(host_no, CONNECT_EPP_MAYBE);
+ cmd->SCp.phase++;
+
+ /* Phase 2 - We are now talking to the scsi bus */
+ case 2:
+ if (!imm_select(host_no, cmd->target)) {
+ imm_fail(host_no, DID_NO_CONNECT);
+ return 0;
+ }
+ cmd->SCp.phase++;
+
+ /* Phase 3 - Ready to accept a command */
+ case 3:
+ w_ctr(ppb, 0x0c);
+ if (!(r_str(ppb) & 0x80))
+ return 1;
+
+ if (!imm_send_command(cmd))
+ return 0;
+ cmd->SCp.phase++;
+
+ /* Phase 4 - Setup scatter/gather buffers */
+ case 4:
+ if (cmd->use_sg) {
+ /* if many buffers are available, start filling the first */
+ cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
+ cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ cmd->SCp.ptr = cmd->SCp.buffer->address;
+ } else {
+ /* else fill the only available buffer */
+ cmd->SCp.buffer = NULL;
+ cmd->SCp.this_residual = cmd->request_bufflen;
+ cmd->SCp.ptr = cmd->request_buffer;
+ }
+ cmd->SCp.buffers_residual = cmd->use_sg;
+ cmd->SCp.phase++;
+ if (cmd->SCp.this_residual & 0x01) {
+ cmd->SCp.this_residual++;
+ printk("IMM: adjusted buffer for 16 bit transfer\n");
+ }
+ /* Phase 5 - Pre-Data transfer stage */
+ case 5:
+ /* Spin lock for BUSY */
+ w_ctr(ppb, 0x0c);
+ if (!(r_str(ppb) & 0x80))
+ return 1;
+
+ /* Require negotiation for read requests */
+ x = (r_str(ppb) & 0xb8);
+ tmp->rd = (x & 0x10) ? 1 : 0;
+ tmp->dp = (x & 0x20) ? 0 : 1;
+
+ if ((tmp->dp) && (tmp->rd))
+ if (imm_negotiate(tmp))
+ return 0;
+ cmd->SCp.phase++;
+
+ /* Phase 6 - Data transfer stage */
+ case 6:
+ /* Spin lock for BUSY */
+ w_ctr(ppb, 0x0c);
+ if (!(r_str(ppb) & 0x80))
+ return 1;
+
+ if (tmp->dp) {
+ retv = imm_completion(cmd);
+ if (retv == -1)
+ return 0;
+ if (retv == 0)
+ return 1;
+ }
+ cmd->SCp.phase++;
+
+ /* Phase 7 - Post data transfer stage */
+ case 7:
+ if ((tmp->dp) && (tmp->rd)) {
+ if ((tmp->mode == IMM_NIBBLE) || (tmp->mode == IMM_PS2)) {
+ w_ctr(ppb, 0x4);
+ w_ctr(ppb, 0xc);
+ w_ctr(ppb, 0xe);
+ w_ctr(ppb, 0x4);
+ }
+ }
+ cmd->SCp.phase++;
+
+ /* Phase 8 - Read status/message */
+ case 8:
+ /* Check for data overrun */
+ if (imm_wait(host_no) != (unsigned char) 0xb8) {
+ imm_fail(host_no, DID_ERROR);
+ return 0;
+ }
+ if (imm_negotiate(tmp))
+ return 0;
+ if (imm_in(host_no, &l, 1)) { /* read status byte */
+ /* Check for optional message byte */
+ if (imm_wait(host_no) == (unsigned char) 0xb8)
+ imm_in(host_no, &h, 1);
+ cmd->result = (DID_OK << 16) + (l & STATUS_MASK);
+ }
+ if ((tmp->mode == IMM_NIBBLE) || (tmp->mode == IMM_PS2)) {
+ w_ctr(ppb, 0x4);
+ w_ctr(ppb, 0xc);
+ w_ctr(ppb, 0xe);
+ w_ctr(ppb, 0x4);
+ }
+ return 0; /* Finished */
+ break;
+
+ default:
+ printk("imm: Invalid scsi phase\n");
+ }
+ return 0;
+}
+
+int imm_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
+{
+ int host_no = cmd->host->unique_id;
+
+ if (imm_hosts[host_no].cur_cmd) {
+ printk("IMM: bug in imm_queuecommand\n");
+ return 0;
+ }
+ imm_hosts[host_no].failed = 0;
+ imm_hosts[host_no].jstart = jiffies;
+ imm_hosts[host_no].cur_cmd = cmd;
+ cmd->scsi_done = done;
+ cmd->result = DID_ERROR << 16; /* default return code */
+ cmd->SCp.phase = 0; /* bus free */
+
+ imm_pb_claim(host_no);
+
+ imm_hosts[host_no].imm_tq.data = imm_hosts + host_no;
+ imm_hosts[host_no].imm_tq.sync = 0;
+ queue_task(&imm_hosts[host_no].imm_tq, &tq_immediate);
+ mark_bh(IMMEDIATE_BH);
+
+ return 0;
+}
+
+/*
+ * Aimmrently the 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.
+ */
+int imm_biosparam(Disk * disk, kdev_t dev, int ip[])
+{
+ ip[0] = 0x40;
+ ip[1] = 0x20;
+ ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
+ if (ip[2] > 1024) {
+ ip[0] = 0xff;
+ ip[1] = 0x3f;
+ ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
+ if (ip[2] > 1023)
+ ip[2] = 1023;
+ }
+ return 0;
+}
+
+int imm_abort(Scsi_Cmnd * cmd)
+{
+ /*
+ * 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 */
+ cmd->result = DID_ABORT;
+ cmd->done(cmd);
+ return SCSI_ABORT_SUCCESS;
+ break;
+ default: /* SCSI command sent, can not abort */
+ return SCSI_ABORT_BUSY;
+ break;
+ }
+}
+
+void imm_reset_pulse(unsigned int base)
+{
+ w_ctr(base, 0x04);
+ w_dtr(base, 0x40);
+ udelay(1);
+ w_ctr(base, 0x0c);
+ w_ctr(base, 0x0d);
+ udelay(50);
+ w_ctr(base, 0x0c);
+ w_ctr(base, 0x04);
+}
+
+int imm_reset(Scsi_Cmnd * cmd, unsigned int x)
+{
+ int host_no = cmd->host->unique_id;
+
+ /*
+ * PHASE1:
+ * Bring the interface crashing down on whatever is running
+ * hopefully this will kill the request.
+ * Bring back up the interface, reset the drive (and anything
+ * attached for that manner)
+ */
+ if (cmd)
+ if (cmd->SCp.phase)
+ imm_disconnect(cmd->host->unique_id);
+
+ imm_connect(host_no, CONNECT_NORMAL);
+ imm_reset_pulse(IMM_BASE(host_no));
+ udelay(1000); /* delay for devices to settle down */
+ imm_disconnect(host_no);
+ udelay(1000); /* Additional delay to allow devices to settle down */
+
+ /*
+ * PHASE2:
+ * Sanity check for the sake of mid-level driver
+ */
+ if (!cmd) {
+ printk("imm bus reset called for invalid command.\n");
+ return SCSI_RESET_NOT_RUNNING;
+ }
+ /*
+ * PHASE3:
+ * Flag the current command as having died due to reset
+ */
+ imm_connect(host_no, CONNECT_NORMAL);
+ imm_fail(host_no, DID_RESET);
+
+ /* Since the command was already on the timer queue imm_interrupt
+ * will be called shortly.
+ */
+ return SCSI_RESET_PENDING;
+}
+
+static int device_check(int host_no)
+{
+ /* 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 char cmd[6] =
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+ int loop, old_mode, status, k, ppb = IMM_BASE(host_no);
+ unsigned char l;
+
+ old_mode = imm_hosts[host_no].mode;
+ for (loop = 0; loop < 8; loop++) {
+ /* Attempt to use EPP for Test Unit Ready */
+ if ((ppb & 0x0007) == 0x0000)
+ imm_hosts[host_no].mode = IMM_EPP_32;
+
+ second_pass:
+ imm_connect(host_no, CONNECT_EPP_MAYBE);
+ /* Select SCSI device */
+ if (!imm_select(host_no, loop)) {
+ imm_disconnect(host_no);
+ continue;
+ }
+ printk("imm: Found device at ID %i, Attempting to use %s\n", loop,
+ IMM_MODE_STRING[imm_hosts[host_no].mode]);
+
+ /* Send SCSI command */
+ status = 1;
+ w_ctr(ppb, 0x0c);
+ for (l = 0; (l < 3) && (status); l++)
+ status = imm_out(host_no, &cmd[l<<1], 2);
+
+ if (!status) {
+ imm_disconnect(host_no);
+ imm_connect(host_no, CONNECT_EPP_MAYBE);
+ w_dtr(ppb, 0x40);
+ w_ctr(ppb, 0x08);
+ udelay(30);
+ w_ctr(ppb, 0x0c);
+ udelay(1000);
+ imm_disconnect(host_no);
+ udelay(1000);
+ if (imm_hosts[host_no].mode == IMM_EPP_32) {
+ imm_hosts[host_no].mode = old_mode;
+ goto second_pass;
+ }
+ printk("imm: Unable to establish communication, aborting driver load.\n");
+ return 1;
+ }
+ w_ctr(ppb, 0x0c);
+
+ k = 1000000; /* 1 Second */
+ do {
+ l = r_str(ppb);
+ k--;
+ udelay(1);
+ } while (!(l & 0x80) && (k));
+
+ l &= 0xb8;
+
+ if (l != 0xb8) {
+ imm_disconnect(host_no);
+ imm_connect(host_no, CONNECT_EPP_MAYBE);
+ imm_reset_pulse(IMM_BASE(host_no));
+ udelay(1000);
+ imm_disconnect(host_no);
+ udelay(1000);
+ if (imm_hosts[host_no].mode == IMM_EPP_32) {
+ imm_hosts[host_no].mode = old_mode;
+ goto second_pass;
+ }
+ printk("imm: Unable to establish communication, aborting driver load.\n");
+ return 1;
+ }
+ imm_disconnect(host_no);
+ printk("imm: Communication established with ID %i using %s\n", loop,
+ IMM_MODE_STRING[imm_hosts[host_no].mode]);
+ imm_connect(host_no, CONNECT_EPP_MAYBE);
+ imm_reset_pulse(IMM_BASE(host_no));
+ udelay(1000);
+ imm_disconnect(host_no);
+ udelay(1000);
+ return 0;
+ }
+ printk("imm: No devices found, aborting driver load.\n");
+ return 1;
+}
+
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TCL-scripts by Sam Shen, slshen@lbl.gov