// SPDX-License-Identifier: GPL-2.0-only /* 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.) * * My unofficial company acronym list is 21 pages long: * FLA: Four letter acronym with built in facility for * future expansion to five letters. */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/blkdev.h> #include <linux/parport.h> #include <linux/workqueue.h> #include <linux/delay.h> #include <linux/slab.h> #include <asm/io.h> #include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_device.h> #include <scsi/scsi_host.h> /* The following #define is to avoid a clash with hosts.c */ #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 typedef struct { struct pardevice *dev; /* Parport device entry */ int base; /* Actual port address */ int base_hi; /* Hi Base address for ECP-ISA chipset */ int mode; /* Transfer mode */ struct scsi_cmnd *cur_cmd; /* Current queued command */ struct delayed_work imm_tq; /* Polling interrupt 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 wanted:1; /* Parport sharing busy flag */ unsigned int dev_no; /* Device number */ wait_queue_head_t *waiting; struct Scsi_Host *host; struct list_head list; } imm_struct; static void imm_reset_pulse(unsigned int base); static int device_check(imm_struct *dev); #include "imm.h" static inline imm_struct *imm_dev(struct Scsi_Host *host) { return *(imm_struct **)&host->hostdata; } static DEFINE_SPINLOCK(arbitration_lock); static void got_it(imm_struct *dev) { dev->base = dev->dev->port->base; if (dev->cur_cmd) dev->cur_cmd->SCp.phase = 1; else wake_up(dev->waiting); } static void imm_wakeup(void *ref) { imm_struct *dev = (imm_struct *) ref; unsigned long flags; spin_lock_irqsave(&arbitration_lock, flags); if (dev->wanted) { if (parport_claim(dev->dev) == 0) { got_it(dev); dev->wanted = 0; } } spin_unlock_irqrestore(&arbitration_lock, flags); } static int imm_pb_claim(imm_struct *dev) { unsigned long flags; int res = 1; spin_lock_irqsave(&arbitration_lock, flags); if (parport_claim(dev->dev) == 0) { got_it(dev); res = 0; } dev->wanted = res; spin_unlock_irqrestore(&arbitration_lock, flags); return res; } static void imm_pb_dismiss(imm_struct *dev) { unsigned long flags; int wanted; spin_lock_irqsave(&arbitration_lock, flags); wanted = dev->wanted; dev->wanted = 0; spin_unlock_irqrestore(&arbitration_lock, flags); if (!wanted) parport_release(dev->dev); } static inline void imm_pb_release(imm_struct *dev) { parport_release(dev->dev); } /* 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... (Too 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 int imm_write_info(struct Scsi_Host *host, char *buffer, int length) { imm_struct *dev = imm_dev(host); if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) { dev->mode = simple_strtoul(buffer + 5, NULL, 0); return length; } printk("imm /proc: invalid variable\n"); return -EINVAL; } static int imm_show_info(struct seq_file *m, struct Scsi_Host *host) { imm_struct *dev = imm_dev(host); seq_printf(m, "Version : %s\n", IMM_VERSION); seq_printf(m, "Parport : %s\n", dev->dev->port->name); seq_printf(m, "Mode : %s\n", IMM_MODE_STRING[dev->mode]); return 0; } #if IMM_DEBUG > 0 #define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\ y, __func__, __LINE__); imm_fail_func(x,y); static inline void imm_fail_func(imm_struct *dev, int error_code) #else static inline void imm_fail(imm_struct *dev, int error_code) #endif { /* If we fail a device then we trash status / message bytes */ if (dev->cur_cmd) { dev->cur_cmd->result = error_code << 16; dev->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(imm_struct *dev) { int k; unsigned short ppb = dev->base; 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 occurred */ imm_fail(dev, 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 1284-1994 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, DID_ERROR); } return a; } /* * Clear EPP timeout bit. */ static inline void epp_reset(unsigned short ppb) { int i; i = r_str(ppb); w_str(ppb, i); w_str(ppb, i & 0xfe); } /* * Wait for empty ECP fifo (if we are in ECP fifo mode only) */ static inline void ecp_sync(imm_struct *dev) { int i, ppb_hi = dev->base_hi; if (ppb_hi == 0) return; if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */ for (i = 0; i < 100; i++) { if (r_ecr(ppb_hi) & 0x01) return; udelay(5); } printk("imm: ECP sync failed as data still present in FIFO.\n"); } } static int imm_byte_out(unsigned short base, const char *buffer, int len) { int i; w_ctr(base, 0x4); /* apparently 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); /* apparently a sane mode */ return 1; /* All went well - we hope! */ } static int imm_nibble_in(unsigned short base, char *buffer, int len) { unsigned char 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) & 0xf0) >> 4; w_ctr(base, 0x5); *buffer++ = (r_str(base) & 0xf0) | l; w_ctr(base, 0x4); } return 1; /* All went well - we hope! */ } static 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 int imm_out(imm_struct *dev, char *buffer, int len) { unsigned short ppb = dev->base; int r = imm_wait(dev); /* * Make sure that: * a) the SCSI bus is BUSY (device still listening) * b) the device is listening */ if ((r & 0x18) != 0x08) { imm_fail(dev, DID_ERROR); printk("IMM: returned SCSI status %2x\n", r); return 0; } switch (dev->mode) { case IMM_EPP_32: case IMM_EPP_16: case IMM_EPP_8: epp_reset(ppb); w_ctr(ppb, 0x4); #ifdef CONFIG_SCSI_IZIP_EPP16 if (!(((long) buffer | len) & 0x01)) outsw(ppb + 4, buffer, len >> 1); #else if (!(((long) buffer | len) & 0x03)) outsl(ppb + 4, buffer, len >> 2); #endif else outsb(ppb + 4, buffer, len); w_ctr(ppb, 0xc); r = !(r_str(ppb) & 0x01); w_ctr(ppb, 0xc); ecp_sync(dev); 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(imm_struct *dev, char *buffer, int len) { unsigned short ppb = dev->base; int r = imm_wait(dev); /* * Make sure that: * a) the SCSI bus is BUSY (device still listening) * b) the device is sending data */ if ((r & 0x18) != 0x18) { imm_fail(dev, DID_ERROR); return 0; } switch (dev->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); #ifdef CONFIG_SCSI_IZIP_EPP16 if (!(((long) buffer | len) & 0x01)) insw(ppb + 4, buffer, len >> 1); #else if (!(((long) buffer | len) & 0x03)) insl(ppb + 4, buffer, len >> 2); #endif else insb(ppb + 4, buffer, len); w_ctr(ppb, 0x2c); r = !(r_str(ppb) & 0x01); w_ctr(ppb, 0x2c); ecp_sync(dev); 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(imm_struct *dev, int flag) { unsigned short ppb = dev->base; imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */ imm_cpp(ppb, 0x30); /* Disconnect all devices */ if ((dev->mode == IMM_EPP_8) || (dev->mode == IMM_EPP_16) || (dev->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(imm_struct *dev) { imm_cpp(dev->base, 0x30); /* Disconnect all devices */ } static int imm_select(imm_struct *dev, int target) { int k; unsigned short ppb = dev->base; /* * 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(imm_struct *dev) { if (imm_connect(dev, 0) != 1) return -EIO; imm_reset_pulse(dev->base); mdelay(1); /* Delay to allow devices to settle */ imm_disconnect(dev); mdelay(1); /* Another delay to allow devices to settle */ return device_check(dev); } static inline int imm_send_command(struct scsi_cmnd *cmd) { imm_struct *dev = imm_dev(cmd->device->host); int k; /* NOTE: IMM uses byte pairs */ for (k = 0; k < cmd->cmd_len; k += 2) if (!imm_out(dev, &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(struct scsi_cmnd *cmd) { /* Return codes: * -1 Error * 0 Told to schedule * 1 Finished data transfer */ imm_struct *dev = imm_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 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 (time_after(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(dev, DID_ERROR); return -1; /* ERROR_RETURN */ } /* determine if we should use burst I/O */ if (dev->rd == 0) { fast = (bulk && (cmd->SCp.this_residual >= IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 2; status = imm_out(dev, cmd->SCp.ptr, fast); } else { fast = (bulk && (cmd->SCp.this_residual >= IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 1; status = imm_in(dev, cmd->SCp.ptr, fast); } cmd->SCp.ptr += fast; cmd->SCp.this_residual -= fast; if (!status) { imm_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); /* * 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++; } } /* 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 */ } /* * 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(struct work_struct *work) { imm_struct *dev = container_of(work, imm_struct, imm_tq.work); struct scsi_cmnd *cmd = dev->cur_cmd; struct Scsi_Host *host = cmd->device->host; unsigned long flags; if (imm_engine(dev, cmd)) { schedule_delayed_work(&dev->imm_tq, 1); 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->device->id); 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(dev); imm_pb_dismiss(dev); spin_lock_irqsave(host->host_lock, flags); dev->cur_cmd = NULL; cmd->scsi_done(cmd); spin_unlock_irqrestore(host->host_lock, flags); return; } static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) { unsigned short ppb = dev->base; unsigned char l = 0, h = 0; int retv, x; /* First check for any errors that may have 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 */ imm_fail(dev, DID_BUS_BUSY); return 0; } return 1; /* wait until imm_wakeup claims parport */ case 1: /* Phase 1 - Connected */ imm_connect(dev, CONNECT_EPP_MAYBE); cmd->SCp.phase++; /* fall through */ case 2: /* Phase 2 - We are now talking to the scsi bus */ if (!imm_select(dev, scmd_id(cmd))) { imm_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 (!imm_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++; if (cmd->SCp.this_residual & 0x01) cmd->SCp.this_residual++; /* fall through */ case 5: /* Phase 5 - Pre-Data transfer stage */ /* 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); dev->rd = (x & 0x10) ? 1 : 0; dev->dp = (x & 0x20) ? 0 : 1; if ((dev->dp) && (dev->rd)) if (imm_negotiate(dev)) return 0; cmd->SCp.phase++; /* fall through */ case 6: /* Phase 6 - Data transfer stage */ /* Spin lock for BUSY */ w_ctr(ppb, 0x0c); if (!(r_str(ppb) & 0x80)) return 1; if (dev->dp) { retv = imm_completion(cmd); if (retv == -1) return 0; if (retv == 0) return 1; } cmd->SCp.phase++; /* fall through */ case 7: /* Phase 7 - Post data transfer stage */ if ((dev->dp) && (dev->rd)) { if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { w_ctr(ppb, 0x4); w_ctr(ppb, 0xc); w_ctr(ppb, 0xe); w_ctr(ppb, 0x4); } } cmd->SCp.phase++; /* fall through */ case 8: /* Phase 8 - Read status/message */ /* Check for data overrun */ if (imm_wait(dev) != (unsigned char) 0xb8) { imm_fail(dev, DID_ERROR); return 0; } if (imm_negotiate(dev)) return 0; if (imm_in(dev, &l, 1)) { /* read status byte */ /* Check for optional message byte */ if (imm_wait(dev) == (unsigned char) 0xb8) imm_in(dev, &h, 1); cmd->result = (DID_OK << 16) | (l & STATUS_MASK); } if ((dev->mode == IMM_NIBBLE) || (dev->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; } static int imm_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) { imm_struct *dev = imm_dev(cmd->device->host); if (dev->cur_cmd) { printk("IMM: bug in imm_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->imm_tq, 0); imm_pb_claim(dev); return 0; } static DEF_SCSI_QCMD(imm_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 imm_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]); } return 0; } static int imm_abort(struct scsi_cmnd *cmd) { imm_struct *dev = imm_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 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); } static int imm_reset(struct scsi_cmnd *cmd) { imm_struct *dev = imm_dev(cmd->device->host); if (cmd->SCp.phase) imm_disconnect(dev); dev->cur_cmd = NULL; /* Forget the problem */ imm_connect(dev, CONNECT_NORMAL); imm_reset_pulse(dev->base); mdelay(1); /* device settle delay */ imm_disconnect(dev); mdelay(1); /* device settle delay */ return SUCCESS; } static int device_check(imm_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 char 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 = IMM_EPP_32; second_pass: imm_connect(dev, CONNECT_EPP_MAYBE); /* Select SCSI device */ if (!imm_select(dev, loop)) { imm_disconnect(dev); continue; } printk("imm: Found device at ID %i, Attempting to use %s\n", loop, IMM_MODE_STRING[dev->mode]); /* Send SCSI command */ status = 1; w_ctr(ppb, 0x0c); for (l = 0; (l < 3) && (status); l++) status = imm_out(dev, &cmd[l << 1], 2); if (!status) { imm_disconnect(dev); imm_connect(dev, CONNECT_EPP_MAYBE); imm_reset_pulse(dev->base); udelay(1000); imm_disconnect(dev); udelay(1000); if (dev->mode == IMM_EPP_32) { dev->mode = old_mode; goto second_pass; } printk("imm: Unable to establish communication\n"); return -EIO; } 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(dev); imm_connect(dev, CONNECT_EPP_MAYBE); imm_reset_pulse(dev->base); udelay(1000); imm_disconnect(dev); udelay(1000); if (dev->mode == IMM_EPP_32) { dev->mode = old_mode; goto second_pass; } printk ("imm: Unable to establish communication\n"); return -EIO; } imm_disconnect(dev); printk ("imm: Communication established at 0x%x with ID %i using %s\n", ppb, loop, IMM_MODE_STRING[dev->mode]); imm_connect(dev, CONNECT_EPP_MAYBE); imm_reset_pulse(dev->base); udelay(1000); imm_disconnect(dev); udelay(1000); return 0; } printk("imm: No devices found\n"); return -ENODEV; } /* * imm cannot deal with highmem, so this causes all IO pages for this host * to reside in low memory (hence mapped) */ static int imm_adjust_queue(struct scsi_device *device) { blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH); return 0; } static struct scsi_host_template imm_template = { .module = THIS_MODULE, .proc_name = "imm", .show_info = imm_show_info, .write_info = imm_write_info, .name = "Iomega VPI2 (imm) interface", .queuecommand = imm_queuecommand, .eh_abort_handler = imm_abort, .eh_host_reset_handler = imm_reset, .bios_param = imm_biosparam, .this_id = 7, .sg_tablesize = SG_ALL, .can_queue = 1, .slave_alloc = imm_adjust_queue, }; /*************************************************************************** * Parallel port probing routines * ***************************************************************************/ static LIST_HEAD(imm_hosts); /* * Finds the first available device number that can be alloted to the * new imm 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 imm_struct *find_parent(void) { imm_struct *dev, *par = NULL; unsigned int cnt = 0; if (list_empty(&imm_hosts)) return NULL; list_for_each_entry(dev, &imm_hosts, list) { if (dev->dev_no != cnt) return par; cnt++; par = dev; } return par; } static int __imm_attach(struct parport *pb) { struct Scsi_Host *host; imm_struct *dev, *temp; DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting); DEFINE_WAIT(wait); int ports; int modes, ppb; int err = -ENOMEM; struct pardev_cb imm_cb; init_waitqueue_head(&waiting); dev = kzalloc(sizeof(imm_struct), GFP_KERNEL); if (!dev) return -ENOMEM; dev->base = -1; dev->mode = IMM_AUTODETECT; INIT_LIST_HEAD(&dev->list); temp = find_parent(); if (temp) dev->dev_no = temp->dev_no + 1; memset(&imm_cb, 0, sizeof(imm_cb)); imm_cb.private = dev; imm_cb.wakeup = imm_wakeup; dev->dev = parport_register_dev_model(pb, "imm", &imm_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 (imm_pb_claim(dev)) schedule_timeout(3 * HZ); if (dev->wanted) { printk(KERN_ERR "imm%d: failed to claim parport because " "a pardevice is owning the port for too long " "time!\n", pb->number); imm_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; dev->base_hi = dev->dev->port->base_hi; w_ctr(ppb, 0x0c); modes = dev->dev->port->modes; /* Mode detection works up the chain of speed * This avoids a nasty if-then-else-if-... tree */ dev->mode = IMM_NIBBLE; if (modes & PARPORT_MODE_TRISTATE) dev->mode = IMM_PS2; /* Done configuration */ err = imm_init(dev); imm_pb_release(dev); if (err) goto out1; /* now the glue ... */ if (dev->mode == IMM_NIBBLE || dev->mode == IMM_PS2) ports = 3; else ports = 8; INIT_DELAYED_WORK(&dev->imm_tq, imm_interrupt); err = -ENOMEM; host = scsi_host_alloc(&imm_template, sizeof(imm_struct *)); if (!host) goto out1; host->io_port = pb->base; host->n_io_port = ports; host->dma_channel = -1; host->unique_id = pb->number; *(imm_struct **)&host->hostdata = dev; dev->host = host; if (!temp) list_add_tail(&dev->list, &imm_hosts); else list_add_tail(&dev->list, &temp->list); 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 imm_attach(struct parport *pb) { __imm_attach(pb); } static void imm_detach(struct parport *pb) { imm_struct *dev; list_for_each_entry(dev, &imm_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 imm_driver = { .name = "imm", .match_port = imm_attach, .detach = imm_detach, .devmodel = true, }; static int __init imm_driver_init(void) { printk("imm: Version %s\n", IMM_VERSION); return parport_register_driver(&imm_driver); } static void __exit imm_driver_exit(void) { parport_unregister_driver(&imm_driver); } module_init(imm_driver_init); module_exit(imm_driver_exit); MODULE_LICENSE("GPL");