diff options
Diffstat (limited to 'drivers/scsi/imm.c')
| -rw-r--r-- | drivers/scsi/imm.c | 1288 |
1 files changed, 1288 insertions, 0 deletions
diff --git a/drivers/scsi/imm.c b/drivers/scsi/imm.c new file mode 100644 index 000000000..7a499d621 --- /dev/null +++ b/drivers/scsi/imm.c @@ -0,0 +1,1288 @@ +// 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) + imm_scsi_pointer(dev->cur_cmd)->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 *const cmd) +{ + /* Return codes: + * -1 Error + * 0 Told to schedule + * 1 Finished data transfer + */ + struct scsi_pointer *scsi_pointer = imm_scsi_pointer(cmd); + 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 || scsi_pointer->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 && scsi_pointer->this_residual >= + IMM_BURST_SIZE ? IMM_BURST_SIZE : 2; + status = imm_out(dev, scsi_pointer->ptr, fast); + } else { + fast = bulk && scsi_pointer->this_residual >= + IMM_BURST_SIZE ? IMM_BURST_SIZE : 1; + status = imm_in(dev, scsi_pointer->ptr, fast); + } + + scsi_pointer->ptr += fast; + scsi_pointer->this_residual -= fast; + + if (!status) { + imm_fail(dev, DID_BUS_BUSY); + return -1; /* ERROR_RETURN */ + } + if (scsi_pointer->buffer && !scsi_pointer->this_residual) { + /* if scatter/gather, advance to the next segment */ + if (scsi_pointer->buffers_residual--) { + scsi_pointer->buffer = + sg_next(scsi_pointer->buffer); + scsi_pointer->this_residual = + scsi_pointer->buffer->length; + scsi_pointer->ptr = sg_virt(scsi_pointer->buffer); + + /* + * Make sure that we transfer even number of bytes + * otherwise it makes imm_byte_out() messy. + */ + if (scsi_pointer->this_residual & 0x01) + scsi_pointer->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 (imm_scsi_pointer(cmd)->phase > 1) + imm_disconnect(dev); + + imm_pb_dismiss(dev); + + spin_lock_irqsave(host->host_lock, flags); + dev->cur_cmd = NULL; + scsi_done(cmd); + spin_unlock_irqrestore(host->host_lock, flags); + return; +} + +static int imm_engine(imm_struct *dev, struct scsi_cmnd *const cmd) +{ + struct scsi_pointer *scsi_pointer = imm_scsi_pointer(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 (scsi_pointer->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); + scsi_pointer->phase++; + fallthrough; + + 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; + } + scsi_pointer->phase++; + fallthrough; + + 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; + scsi_pointer->phase++; + fallthrough; + + case 4: /* Phase 4 - Setup scatter/gather buffers */ + if (scsi_bufflen(cmd)) { + scsi_pointer->buffer = scsi_sglist(cmd); + scsi_pointer->this_residual = scsi_pointer->buffer->length; + scsi_pointer->ptr = sg_virt(scsi_pointer->buffer); + } else { + scsi_pointer->buffer = NULL; + scsi_pointer->this_residual = 0; + scsi_pointer->ptr = NULL; + } + scsi_pointer->buffers_residual = scsi_sg_count(cmd) - 1; + scsi_pointer->phase++; + if (scsi_pointer->this_residual & 0x01) + scsi_pointer->this_residual++; + fallthrough; + + 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; + scsi_pointer->phase++; + fallthrough; + + 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; + } + scsi_pointer->phase++; + fallthrough; + + 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); + } + } + scsi_pointer->phase++; + fallthrough; + + 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 */ + + default: + printk("imm: Invalid scsi phase\n"); + } + return 0; +} + +static int imm_queuecommand_lck(struct scsi_cmnd *cmd) +{ + 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->result = DID_ERROR << 16; /* default return code */ + imm_scsi_pointer(cmd)->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 (imm_scsi_pointer(cmd)->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; + default: /* SCSI command sent, can not abort */ + return FAILED; + } +} + +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 (imm_scsi_pointer(cmd)->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, + .cmd_size = sizeof(struct scsi_pointer), +}; + +/*************************************************************************** + * 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, +}; +module_parport_driver(imm_driver); + +MODULE_LICENSE("GPL"); |