/* ppa.c -- low level driver for the IOMEGA PPA3 * parallel port SCSI host adapter. * * (The PPA3 is the embedded controller in the ZIP drive.) * * (c) 1995,1996 Grant R. Guenther, grant@torque.net, * under the terms of the GNU Public License. * * Current Maintainer: David Campbell (Perth, Western Australia, GMT+0800) * campbell@gear.torque.net * dcampbel@p01.as17.honeywell.com.au */ #include /* The following #define is to avoid a clash with hosts.c */ #define PPA_CODE 1 #include #include #include #include "sd.h" #include "hosts.h" int ppa_release(struct Scsi_Host *); 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 ppa_tq; /* Polling interupt stuff */ unsigned long jstart; /* Jiffies at start */ unsigned int failed:1; /* Failure flag */ unsigned int p_busy:1; /* Parport sharing busy flag */ } ppa_struct; #define PPA_EMPTY \ {NULL, /* dev */ \ -1, /* base */ \ PPA_AUTODETECT, /* mode */ \ -1, /* host */ \ NULL, /* cur_cmd */ \ {0, 0, ppa_interrupt, NULL}, \ 0, /* jstart */ \ 0, /* failed */ \ 0 /* p_busy */ \ } #include "ppa.h" #include #ifdef CONFIG_KERNELD #include #ifndef PARPORT_MODULES #define PARPORT_MODULES "parport_pc" #endif #endif #define NO_HOSTS 4 static ppa_struct ppa_hosts[NO_HOSTS] = {PPA_EMPTY, PPA_EMPTY, PPA_EMPTY, PPA_EMPTY}; #define PPA_BASE(x) ppa_hosts[(x)].base void ppa_wakeup(void *ref) { ppa_struct *ppa_dev = (ppa_struct *) ref; if (!ppa_dev->p_busy) return; if (parport_claim(ppa_dev->dev)) { printk("ppa: bug in ppa_wakeup\n"); return; } ppa_dev->p_busy = 0; ppa_dev->base = ppa_dev->dev->port->base; if (ppa_dev->cur_cmd) ppa_dev->cur_cmd->SCp.phase++; return; } int ppa_release(struct Scsi_Host *host) { int host_no = host->unique_id; printk("Releasing ppa%i\n", host_no); parport_unregister_device(ppa_hosts[host_no].dev); return 0; } static int ppa_pb_claim(int host_no) { if (parport_claim(ppa_hosts[host_no].dev)) { ppa_hosts[host_no].p_busy = 1; return 1; } PPA_BASE(host_no) = ppa_hosts[host_no].dev->port->base; if (ppa_hosts[host_no].cur_cmd) ppa_hosts[host_no].cur_cmd->SCp.phase++; return 0; } #define ppa_pb_release(x) parport_release(ppa_hosts[(x)].dev) /*************************************************************************** * Parallel port probing routines * ***************************************************************************/ #ifdef MODULE Scsi_Host_Template driver_template = PPA; #include "scsi_module.c" #endif /* * Start of Chipset kludges */ int ppa_detect(Scsi_Host_Template * host) { struct Scsi_Host *hreg; int ports; int i, nhosts, try_again; struct parport *pb = parport_enumerate(); printk("ppa: Version %s\n", PPA_VERSION); nhosts = 0; try_again = 0; #ifdef CONFIG_KERNELD if (!pb) { request_module(PARPORT_MODULES); pb = parport_enumerate(); } #endif if (!pb) { printk("ppa: parport reports no devices.\n"); return 0; } retry_entry: for (i = 0; pb; i++, pb = pb->next) { int modes, ppb; ppa_hosts[i].dev = parport_register_device(pb, "ppa", NULL, ppa_wakeup, NULL, PARPORT_DEV_TRAN, (void *) &ppa_hosts[i]); /* Claim the bus so it remembers what we do to the control * registers. [ CTR and ECP ] */ if (ppa_pb_claim(i)) while (ppa_hosts[i].p_busy) schedule(); /* Whe can safe schedule() here */ ppb = PPA_BASE(i); w_ctr(ppb, 0x0c); modes = ppa_hosts[i].dev->port->modes; /* Mode detection works up the chain of speed * This avoids a nasty if-then-else-if-... tree */ ppa_hosts[i].mode = PPA_NIBBLE; if (modes & PARPORT_MODE_PCPS2) ppa_hosts[i].mode = PPA_PS2; if (modes & PARPORT_MODE_PCECPPS2) { w_ecr(ppb, 0x20); ppa_hosts[i].mode = PPA_PS2; } if (modes & PARPORT_MODE_PCECPEPP) w_ecr(ppb, 0x80); /* Done configuration */ ppa_pb_release(i); if (ppa_init(i)) { parport_unregister_device(ppa_hosts[i].dev); continue; } /* now the glue ... */ switch (ppa_hosts[i].mode) { case PPA_NIBBLE: ports = 3; break; case PPA_PS2: ports = 3; break; case PPA_EPP_8: case PPA_EPP_16: case PPA_EPP_32: ports = 8; break; default: /* Never gets here */ continue; } host->can_queue = PPA_CAN_QUEUE; host->sg_tablesize = ppa_sg; hreg = scsi_register(host, 0); hreg->io_port = pb->base; hreg->n_io_port = ports; hreg->dma_channel = -1; hreg->unique_id = i; ppa_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 ppa driver a way to modify the timings (and other * parameters) by writing to the /proc/scsi/ppa/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 ppa_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 ppa_proc_write(int hostno, char *buffer, int length) { unsigned long x; if ((length > 5) && (ppa_strncmp(buffer, "mode=", 5) == 0)) { x = simple_strtoul(buffer + 5, NULL, 0); ppa_hosts[hostno].mode = x; return length; } printk("ppa /proc: invalid variable\n"); return (-EINVAL); } int ppa_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 (ppa_hosts[i].host == hostno) break; if (inout) return ppa_proc_write(i, buffer, length); len += sprintf(buffer + len, "Version : %s\n", PPA_VERSION); len += sprintf(buffer + len, "Parport : %s\n", ppa_hosts[i].dev->port->name); len += sprintf(buffer + len, "Mode : %s\n", PPA_MODE_STRING[ppa_hosts[i].mode]); /* Request for beyond end of buffer */ if (offset > length) return 0; *start = buffer + offset; len -= offset; if (len > length) len = length; return len; } static int device_check(int host_no); #if PPA_DEBUG > 0 #define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\ y, __FUNCTION__, __LINE__); ppa_fail_func(x,y); static inline void ppa_fail_func(int host_no, int error_code) #else static inline void ppa_fail(int host_no, int error_code) #endif { /* If we fail a device then we trash status / message bytes */ if (ppa_hosts[host_no].cur_cmd) { ppa_hosts[host_no].cur_cmd->result = error_code << 16; ppa_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 ppa_wait(int host_no) { int k; unsigned short ppb = PPA_BASE(host_no); unsigned char r; k = PPA_SPIN_TMO; do { r = r_str(ppb); k--; udelay(1); } while (!(r & 0x80) && (k)); /* * return some status information. * Semantics: 0xc0 = ZIP wants more data * 0xd0 = ZIP wants to send more data * 0xe0 = ZIP is expecting SCSI command data * 0xf0 = end of transfer, ZIP is sending status */ if (k) return (r & 0xf0); /* Counter expired - Time out occured */ ppa_fail(host_no, DID_TIME_OUT); printk("ppa timeout in ppa_wait\n"); return 0; /* command timed out */ } /* * output a string, in whatever mode is available, according to the * PPA protocol. */ 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("ppa: ECP sync failed as data still present in FIFO.\n"); } /* * Here is the asm code for the SPP/PS2 protocols for the i386. * This has been optimised for speed on 386/486 machines. There will * be very little improvement on the current 586+ machines as it is the * IO statements which will limit throughput. */ #ifdef __i386__ #define BYTE_OUT(reg) \ " movb " #reg ",%%al\n" \ " outb %%al,(%%dx)\n" \ " addl $2,%%edx\n" \ " movb $0x0e,%%al\n" \ " outb %%al,(%%dx)\n" \ " movb $0x0c,%%al\n" \ " outb %%al,(%%dx)\n" \ " subl $2,%%edx\n" static inline int ppa_byte_out(unsigned short base, char *buffer, unsigned int len) { /* * %eax scratch * %ebx Data to transfer * %ecx Counter (Don't touch!!) * %edx Port * %esi Source buffer (mem pointer) * * In case you are wondering what the last line of the asm does... * : : */ asm("shr $2,%%ecx\n" \ " jz .no_more_bulk_bo\n" \ " .align 4\n" \ ".loop_bulk_bo:\n" \ " movl (%%esi),%%ebx\n" \ BYTE_OUT(%%bl) \ BYTE_OUT(%%bh) \ " rorl $16,%%ebx\n" \ BYTE_OUT(%%bl) \ BYTE_OUT(%%bh) \ " addl $4,%%esi\n" \ " loop .loop_bulk_bo\n" \ " .align 4\n" \ ".no_more_bulk_bo:" \ : "=S"(buffer): "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx"); asm("andl $3,%%ecx\n" \ " jz .no_more_loose_bo\n" \ " .align 4\n" \ ".loop_loose_bo:\n" \ BYTE_OUT((%%esi)) \ " incl %%esi\n" \ " loop .loop_loose_bo\n" \ ".no_more_loose_bo:\n" \ : /* no output */ : "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx"); return 1; /* All went well - we hope! */ } #define BYTE_IN(reg) \ " inb (%%dx),%%al\n" \ " movb %%al," #reg "\n" \ " addl $2,%%edx\n" \ " movb $0x27,%%al\n" \ " outb %%al,(%%dx)\n" \ " movb $0x25,%%al\n" \ " outb %%al,(%%dx)\n" \ " subl $2,%%edx\n" static inline int ppa_byte_in(unsigned short base, char *buffer, int len) { /* * %eax scratch * %ebx Data to transfer * %ecx Counter (Don't touch!!) * %edx Port * %esi Source buffer (mem pointer) * * In case you are wondering what the last line of the asm does... * : : */ asm("shr $2,%%ecx\n" \ " jz .no_more_bulk_bi\n" \ " .align 4\n" \ ".loop_bulk_bi:\n" \ BYTE_IN(%%bl) \ BYTE_IN(%%bh) \ " rorl $16,%%ebx\n" \ BYTE_IN(%%bl) \ BYTE_IN(%%bh) \ " rorl $16,%%ebx\n" \ " movl %%ebx,(%%esi)\n" \ " addl $4,%%esi\n" \ " loop .loop_bulk_bi\n" \ " .align 4\n" \ ".no_more_bulk_bi:" \ : "=S"(buffer): "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx"); asm("andl $3,%%ecx\n" \ " jz .no_more_loose_bi\n" \ " .align 4\n" \ ".loop_loose_bi:\n" \ BYTE_IN((%%esi)) \ " incl %%esi\n" \ " loop .loop_loose_bi\n" \ ".no_more_loose_bi:\n" \ : /* no output */ : "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx"); return 1; /* All went well - we hope! */ } #define NIBBLE_IN(reg) \ " incl %%edx\n" \ " movb $0x04,%%al\n" \ " outb %%al,(%%dx)\n" \ " decl %%edx\n" \ " inb (%%dx),%%al\n" \ " andb $0xf0,%%al\n" \ " movb %%al," #reg "\n" \ " incl %%edx\n" \ " movb $0x06,%%al\n" \ " outb %%al,(%%dx)\n" \ " decl %%edx\n" \ " inb (%%dx),%%al\n" \ " shrb $4,%%al\n" \ " orb %%al," #reg "\n" static inline int ppa_nibble_in(unsigned short str_p, char *buffer, int len) { /* * %eax scratch * %ebx Data to transfer * %ecx Counter (Don't touch!!) * %edx Port * %esi Source buffer (mem pointer) * * In case you are wondering what the last line of the asm does... * : : */ asm("shr $2,%%ecx\n" \ " jz .no_more_bulk_ni\n" \ " .align 4\n" \ ".loop_bulk_ni:\n" \ NIBBLE_IN(%%bl) \ NIBBLE_IN(%%bh) \ " rorl $16,%%ebx\n" \ NIBBLE_IN(%%bl) \ NIBBLE_IN(%%bh) \ " rorl $16,%%ebx\n" \ " movl %%ebx,(%%esi)\n" \ " addl $4,%%esi\n" \ " loop .loop_bulk_ni\n" \ " .align 4\n" \ ".no_more_bulk_ni:" \ : "=S"(buffer): "c"(len), "d"(str_p), "S"(buffer):"eax", "ebx", "ecx"); asm("andl $3,%%ecx\n" \ " jz .no_more_loose_ni\n" \ " .align 4\n" \ ".loop_loose_ni:\n" \ NIBBLE_IN((%%esi)) \ " incl %%esi\n" \ " loop .loop_loose_ni\n" \ ".no_more_loose_ni:\n" \ : /* no output */ : "c"(len), "d"(str_p), "S"(buffer):"eax", "ebx", "ecx"); return 1; /* All went well - we hope! */ } #else /* Old style C routines */ static inline int ppa_byte_out(unsigned short base, const char *buffer, int len) { unsigned short ctr_p = base + 2; int i; for (i = len; i; i--) { outb(*buffer++, base); outb(0xe, ctr_p); outb(0xc, ctr_p); } return 1; /* All went well - we hope! */ } static inline int ppa_byte_in(unsigned short base, char *buffer, int len) { unsigned short ctr_p = base + 2; int i; for (i = len; i; i--) { *buffer++ = inb(base); outb(0x27, ctr_p); outb(0x25, ctr_p); } return 1; /* All went well - we hope! */ } static inline int ppa_nibble_in(unsigned short str_p, char *buffer, int len) { unsigned short ctr_p = str_p + 1; unsigned char h, l; int i; for (i = len; i; i--) { outb(0x4, ctr_p); h = inb(str_p); outb(0x6, ctr_p); l = inb(str_p); *buffer++ = (h & 0xf0) | ((l & 0xf0) >> 4); } return 1; /* All went well - we hope! */ } #endif static inline int ppa_epp_out(unsigned short epp_p, unsigned short str_p, const char *buffer, int len) { int i; for (i = len; i; i--) { outb(*buffer++, epp_p); #if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 2 if (inb(str_p) & 0x01) return 0; #endif } return 1; } static int ppa_out(int host_no, char *buffer, int len) { int r; unsigned short ppb = PPA_BASE(host_no); r = ppa_wait(host_no); if ((r & 0x50) != 0x40) { ppa_fail(host_no, DID_ERROR); return 0; } switch (ppa_hosts[host_no].mode) { case PPA_NIBBLE: case PPA_PS2: /* 8 bit output, with a loop */ r = ppa_byte_out(ppb, buffer, len); break; case PPA_EPP_32: case PPA_EPP_16: case PPA_EPP_8: epp_reset(ppb); w_ctr(ppb, 0x4); #if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 1 r = ppa_epp_out(ppb + 4, ppb + 1, buffer, len); #else #if CONFIG_SCSI_PPA_HAVE_PEDANTIC == 0 if (!(((long) buffer | len) & 0x03)) outsl(ppb + 4, buffer, len >> 2); else #endif outsb(ppb + 4, buffer, len); w_ctr(ppb, 0xc); r = !(r_str(ppb) & 0x01); #endif w_ctr(ppb, 0xc); ecp_sync(ppb); break; default: printk("PPA: bug in ppa_out()\n"); r = 0; } return r; } static inline int ppa_epp_in(int epp_p, int str_p, char *buffer, int len) { int i; for (i = len; i; i--) { *buffer++ = inb(epp_p); #if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 2 if (inb(str_p) & 0x01) return 0; #endif } return 1; } static int ppa_in(int host_no, char *buffer, int len) { int r; unsigned short ppb = PPA_BASE(host_no); r = ppa_wait(host_no); if ((r & 0x50) != 0x50) { ppa_fail(host_no, DID_ERROR); return 0; } switch (ppa_hosts[host_no].mode) { case PPA_NIBBLE: /* 4 bit input, with a loop */ r = ppa_nibble_in(ppb + 1, buffer, len); w_ctr(ppb, 0xc); break; case PPA_PS2: /* 8 bit input, with a loop */ w_ctr(ppb, 0x25); r = ppa_byte_in(ppb, buffer, len); w_ctr(ppb, 0x4); w_ctr(ppb, 0xc); break; case PPA_EPP_32: case PPA_EPP_16: case PPA_EPP_8: epp_reset(ppb); w_ctr(ppb, 0x24); #if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 1 r = ppa_epp_in(ppb + 4, ppb + 1, buffer, len); #else #if CONFIG_SCSI_PPA_HAVE_PEDANTIC == 0 if (!(((long) buffer | len) & 0x03)) insl(ppb + 4, buffer, len >> 2); else #endif insb(ppb + 4, buffer, len); w_ctr(ppb, 0x2c); r = !(r_str(ppb) & 0x01); #endif w_ctr(ppb, 0x2c); ecp_sync(ppb); break; default: printk("PPA: bug in ppa_ins()\n"); r = 0; break; } return r; } /* end of ppa_io.h */ static inline void ppa_d_pulse(unsigned short ppb, unsigned char b) { w_dtr(ppb, b); w_ctr(ppb, 0xc); w_ctr(ppb, 0xe); w_ctr(ppb, 0xc); w_ctr(ppb, 0x4); w_ctr(ppb, 0xc); } static void ppa_disconnect(int host_no) { unsigned short ppb = PPA_BASE(host_no); ppa_d_pulse(ppb, 0); ppa_d_pulse(ppb, 0x3c); ppa_d_pulse(ppb, 0x20); ppa_d_pulse(ppb, 0xf); } static inline void ppa_c_pulse(unsigned short ppb, unsigned char b) { w_dtr(ppb, b); w_ctr(ppb, 0x4); w_ctr(ppb, 0x6); w_ctr(ppb, 0x4); w_ctr(ppb, 0xc); } static inline void ppa_connect(int host_no, int flag) { unsigned short ppb = PPA_BASE(host_no); ppa_c_pulse(ppb, 0); ppa_c_pulse(ppb, 0x3c); ppa_c_pulse(ppb, 0x20); if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(ppa_hosts[host_no].mode)) ppa_c_pulse(ppb, 0xcf); else ppa_c_pulse(ppb, 0x8f); } static int ppa_select(int host_no, int target) { int k; unsigned short ppb = PPA_BASE(host_no); /* * Bit 6 (0x40) is the device selected bit. * First we must wait till the current device goes off line... */ k = PPA_SELECT_TMO; do { k--; } while ((r_str(ppb) & 0x40) && (k)); if (!k) return 0; w_dtr(ppb, (1 << target)); w_ctr(ppb, 0xe); w_ctr(ppb, 0xc); w_dtr(ppb, 0x80); /* This is NOT the initator */ w_ctr(ppb, 0x8); k = PPA_SELECT_TMO; do { k--; } while (!(r_str(ppb) & 0x40) && (k)); if (!k) return 0; return 1; } /* * This is based on a trace of what the Iomega DOS 'guest' driver does. * I've tried several different kinds of parallel ports with guest and * coded this to react in the same ways that it does. * * The return value from this function is just a hint about where the * handshaking failed. * */ static int ppa_init(int host_no) { int retv; unsigned short ppb = PPA_BASE(host_no); #if defined(CONFIG_PARPORT) || defined(CONFIG_PARPORT_MODULE) if (ppa_pb_claim(host_no)) while (ppa_hosts[host_no].p_busy) schedule(); /* Whe can safe schedule() here */ #endif ppa_disconnect(host_no); ppa_connect(host_no, CONNECT_NORMAL); retv = 2; /* Failed */ w_ctr(ppb, 0xe); if ((r_str(ppb) & 0x08) == 0x08) retv--; w_ctr(ppb, 0xc); if ((r_str(ppb) & 0x08) == 0x00) retv--; /* This is a SCSI BUS reset signal */ if (!retv) { w_dtr(ppb, 0x40); w_ctr(ppb, 0x08); udelay(30); w_ctr(ppb, 0x0c); udelay(1000); /* Allow devices to settle down */ } ppa_disconnect(host_no); udelay(1000); /* Another delay to allow devices to settle */ if (!retv) retv = device_check(host_no); ppa_pb_release(host_no); return retv; } static inline int ppa_send_command(Scsi_Cmnd * cmd) { int host_no = cmd->host->unique_id; int k; w_ctr(PPA_BASE(host_no), 0x0c); for (k = 0; k < cmd->cmd_len; k++) if (!ppa_out(host_no, &cmd->cmnd[k], 1)) 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 ppa_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 = PPA_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 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 (jiffies > start_jiffies + 1) return 0; if (((r & 0xc0) != 0xc0) || (cmd->SCp.this_residual <= 0)) { ppa_fail(host_no, DID_ERROR); return -1; /* ERROR_RETURN */ } /* 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(host_no, cmd->SCp.ptr, fast); else status = ppa_in(host_no, cmd->SCp.ptr, fast); cmd->SCp.ptr += fast; cmd->SCp.this_residual -= fast; if (!status) { ppa_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; } } /* 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 */ } /* deprecated synchronous interface */ int ppa_command(Scsi_Cmnd * cmd) { static int first_pass = 1; int host_no = cmd->host->unique_id; if (first_pass) { printk("ppa: using non-queuing interface\n"); first_pass = 0; } if (ppa_hosts[host_no].cur_cmd) { printk("PPA: bug in ppa_command\n"); return 0; } ppa_hosts[host_no].failed = 0; ppa_hosts[host_no].jstart = jiffies; ppa_hosts[host_no].cur_cmd = cmd; cmd->result = DID_ERROR << 16; /* default return code */ cmd->SCp.phase = 0; ppa_pb_claim(host_no); while (ppa_engine(&ppa_hosts[host_no], cmd)) schedule(); if (cmd->SCp.phase) /* Only disconnect if we have connected */ ppa_disconnect(cmd->host->unique_id); ppa_pb_release(host_no); ppa_hosts[host_no].cur_cmd = 0; return cmd->result; } /* * 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(void *data) { ppa_struct *tmp = (ppa_struct *) data; Scsi_Cmnd *cmd = tmp->cur_cmd; if (!cmd) { printk("PPA: bug in ppa_interrupt\n"); return; } if (ppa_engine(tmp, cmd)) { tmp->ppa_tq.data = (void *) tmp; tmp->ppa_tq.sync = 0; queue_task(&tmp->ppa_tq, &tq_timer); 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("ppa: no device at SCSI ID %i\n", cmd->target); break; case DID_BUS_BUSY: printk("ppa: BUS BUSY - EPP timeout detected\n"); break; case DID_TIME_OUT: printk("ppa: unknown timeout\n"); break; case DID_ABORT: printk("ppa: told to abort\n"); break; case DID_PARITY: printk("ppa: parity error (???)\n"); break; case DID_ERROR: printk("ppa: internal driver error\n"); break; case DID_RESET: printk("ppa: told to reset device\n"); break; case DID_BAD_INTR: printk("ppa: bad interrupt (???)\n"); break; default: printk("ppa: bad return code (%02x)\n", (cmd->result >> 16) & 0xff); } #endif if (cmd->SCp.phase > 1) ppa_disconnect(cmd->host->unique_id); if (cmd->SCp.phase > 0) ppa_pb_release(cmd->host->unique_id); tmp->cur_cmd = 0; cmd->scsi_done(cmd); return; } static int ppa_engine(ppa_struct * tmp, Scsi_Cmnd * cmd) { int host_no = cmd->host->unique_id; unsigned short ppb = PPA_BASE(host_no); unsigned char l = 0, h = 0; int retv; /* 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 */ ppa_fail(host_no, DID_BUS_BUSY); return 0; } return 1; /* wait that ppa_wakeup claims parport */ case 1: /* Phase 1 - Connected */ { /* Perform a sanity check for cable unplugged */ int retv = 2; /* Failed */ ppa_connect(host_no, 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 ((jiffies - tmp->jstart) > (1 * HZ)) { printk("ppa: Parallel port cable is unplugged!!\n"); ppa_fail(host_no, DID_BUS_BUSY); return 0; } else { ppa_disconnect(host_no); 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(host_no, cmd->target)) { ppa_fail(host_no, DID_NO_CONNECT); return 0; } cmd->SCp.phase++; 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++; case 4: /* Phase 4 - Setup scatter/gather buffers */ 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++; 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++; case 6: /* Phase 6 - Read status/message */ cmd->result = DID_OK << 16; /* Check for data overrun */ if (ppa_wait(host_no) != (unsigned char) 0xf0) { ppa_fail(host_no, DID_ERROR); return 0; } if (ppa_in(host_no, &l, 1)) { /* read status byte */ /* Check for optional message byte */ if (ppa_wait(host_no) == (unsigned char) 0xf0) ppa_in(host_no, &h, 1); cmd->result = (DID_OK << 16) + (h << 8) + (l & STATUS_MASK); } return 0; /* Finished */ break; default: printk("ppa: Invalid scsi phase\n"); } return 0; } int ppa_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) { int host_no = cmd->host->unique_id; if (ppa_hosts[host_no].cur_cmd) { printk("PPA: bug in ppa_queuecommand\n"); return 0; } ppa_hosts[host_no].failed = 0; ppa_hosts[host_no].jstart = jiffies; ppa_hosts[host_no].cur_cmd = cmd; cmd->scsi_done = done; cmd->result = DID_ERROR << 16; /* default return code */ cmd->SCp.phase = 0; /* bus free */ ppa_pb_claim(host_no); ppa_hosts[host_no].ppa_tq.data = ppa_hosts + host_no; ppa_hosts[host_no].ppa_tq.sync = 0; queue_task(&ppa_hosts[host_no].ppa_tq, &tq_immediate); mark_bh(IMMEDIATE_BH); return 0; } /* * Apparently 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 ppa_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 ppa_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; } } int ppa_reset(Scsi_Cmnd * cmd, unsigned int x) { int host_no = cmd->host->unique_id; int ppb = PPA_BASE(host_no); /* * 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) ppa_disconnect(cmd->host->unique_id); ppa_connect(host_no, CONNECT_NORMAL); w_dtr(ppb, 0x40); w_ctr(ppb, 0x8); udelay(30); w_ctr(ppb, 0xc); udelay(1000); /* delay for devices to settle down */ ppa_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("ppa bus reset called for invalid command.\n"); return SCSI_RESET_NOT_RUNNING; } /* * PHASE3: * Flag the current command as having died due to reset */ ppa_connect(host_no, CONNECT_NORMAL); ppa_fail(host_no, DID_RESET); /* Since the command was already on the timer queue ppa_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 = PPA_BASE(host_no); unsigned char l; old_mode = ppa_hosts[host_no].mode; for (loop = 0; loop < 8; loop++) { /* Attempt to use EPP for Test Unit Ready */ if ((ppb & 0x0007) == 0x0000) ppa_hosts[host_no].mode = PPA_EPP_32; second_pass: ppa_connect(host_no, CONNECT_EPP_MAYBE); /* Select SCSI device */ if (!ppa_select(host_no, loop)) { ppa_disconnect(host_no); continue; } printk("ppa: Found device at ID %i, Attempting to use %s\n", loop, PPA_MODE_STRING[ppa_hosts[host_no].mode]); /* Send SCSI command */ status = 1; w_ctr(ppb, 0x0c); for (l = 0; (l < 6) && (status); l++) status = ppa_out(host_no, cmd, 1); if (!status) { ppa_disconnect(host_no); ppa_connect(host_no, CONNECT_EPP_MAYBE); w_dtr(ppb, 0x40); w_ctr(ppb, 0x08); udelay(30); w_ctr(ppb, 0x0c); udelay(1000); ppa_disconnect(host_no); udelay(1000); if (ppa_hosts[host_no].mode == PPA_EPP_32) { ppa_hosts[host_no].mode = old_mode; goto second_pass; } printk("ppa: 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 &= 0xf0; if (l != 0xf0) { ppa_disconnect(host_no); ppa_connect(host_no, CONNECT_EPP_MAYBE); w_dtr(ppb, 0x40); w_ctr(ppb, 0x08); udelay(30); w_ctr(ppb, 0x0c); udelay(1000); ppa_disconnect(host_no); udelay(1000); if (ppa_hosts[host_no].mode == PPA_EPP_32) { ppa_hosts[host_no].mode = old_mode; goto second_pass; } printk("ppa: Unable to establish communication, aborting driver load.\n"); return 1; } ppa_disconnect(host_no); printk("ppa: Communication established with ID %i using %s\n", loop, PPA_MODE_STRING[ppa_hosts[host_no].mode]); return 0; } printk("ppa: No devices found, aborting driver load.\n"); return 1; }