diff options
author | Thomas Bushnell <thomas@gnu.org> | 1999-04-26 05:58:44 +0000 |
---|---|---|
committer | Thomas Bushnell <thomas@gnu.org> | 1999-04-26 05:58:44 +0000 |
commit | 86297c41a26f18d924e64fc93321c59cbc4c48dd (patch) | |
tree | 376954c6b95b735d361875319a1a2a9db6a27527 /linux/src/drivers/scsi/ppa.c | |
parent | 851137902d3e7ad87af177487df3eea53e940a1c (diff) |
1998-11-30 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>
Clean up linux emulation code to make it architecture-independent
as much as possible.
* linux: Renamed from linuxdev.
* Makefile.in (objfiles): Add linux.o instead of linuxdev.o.
(MAKE): New variable. Used for the linux.o target.
* configure.in: Add AC_CHECK_TOOL(MAKE, make).
* i386/i386/spl.h: Include <i386/ipl.h>, for compatibility with
OSF Mach 3.0. Suggested by Elgin Lee <ehl@funghi.com>.
* linux/src: Renamed from linux/linux.
* linux/dev: Renamed from linux/mach.
* linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h,
instead of mach/include/linux/autoconf.h.
* Makefile.in (all): Target ../linux.o instead of ../linuxdev.o.
* linux/dev/drivers/block/genhd.c: Include <machine/spl.h> instead
of <i386/ipl.h>.
* linux/dev/drivers/net/auto_irq.c: Remove unneeded header files,
<i386/ipl.h> and <i386/pic.h>.
* linux/dev/init/main.c: Many i386-dependent codes moved to ...
* linux/dev/arch/i386/irq.c: ... here.
* linux/dev/arch/i386/setup.c: New file.
* linux/dev/arch/i386/linux_emul.h: Likewise.
* linux/dev/arch/i386/glue/timer.c: Merged into sched.c.
* linux/dev/arch/i386/glue/sched.c: Include <machine/spl.h> instead
of <i386/ipl.h>, and moved to ...
* linux/dev/kernel/sched.c: ... here.
* linux/dev/arch/i386/glue/block.c: Include <machine/spl.h> and
<linux_emul.h>, instead of i386-dependent header files, and
moved to ...
* linux/dev/glue/blocl.c: ... here.
* linux/dev/arch/i386/glue/net.c: Include <machine/spl.h> and
<linux_emul.h>, instead of i386-dependent header files, and
moved to ...
* linux/dev/glue/net.c: ... here.
* linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ...
* linux/dev/glue/misc.c: ... here.
* linux/dev/arch/i386/glue/kmem.c: Moved to ...
* linux/dev/glue/kmem.c: ... here.
Diffstat (limited to 'linux/src/drivers/scsi/ppa.c')
-rw-r--r-- | linux/src/drivers/scsi/ppa.c | 1550 |
1 files changed, 1550 insertions, 0 deletions
diff --git a/linux/src/drivers/scsi/ppa.c b/linux/src/drivers/scsi/ppa.c new file mode 100644 index 0000000..98749dd --- /dev/null +++ b/linux/src/drivers/scsi/ppa.c @@ -0,0 +1,1550 @@ +/* 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) + * 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 PPA_CODE 1 +#ifndef HAVE_PC87332 +#define HAVE_PC87332 0 +#endif +#define PPA_PROBE_SPP 0x0001 +#define PPA_PROBE_PS2 0x0002 +#define PPA_PROBE_ECR 0x0010 +#define PPA_PROBE_EPP17 0x0100 +#define PPA_PROBE_EPP19 0x0200 +int port_probe(unsigned short); + +#include <linux/blk.h> +#include "sd.h" +#include "hosts.h" +typedef struct { + 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 failed:1; /* Failure flag */ +} ppa_struct; + +#define PPA_EMPTY \ +{-1, /* base */ \ +PPA_AUTODETECT, /* mode */ \ +-1, /* host */ \ +NULL, /* cur_cmd */ \ +{0, 0, ppa_interrupt, NULL}, \ +0, /* jstart */ \ +0 /* failed */ \ +} + +#include "ppa.h" +#undef CONFIG_PARPORT +#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 + +int base[NO_HOSTS] = +{0x03bc, 0x0378, 0x0278, 0x0000}; +#define parbus_base base +#define parbus_no NO_HOSTS + +static inline int ppa_pb_claim(int host_no) +{ + if (ppa_hosts[host_no].cur_cmd) + ppa_hosts[host_no].cur_cmd->SCp.phase++; + return 0; +} + +/*************************************************************************** + * Parallel port probing routines * + ***************************************************************************/ + +#ifndef MODULE +/* + * Command line parameters (for built-in driver): + * + * Syntax: ppa=base[,mode[,use_sg]] + * + * For example: ppa=0x378 or ppa=0x378,0,3 + * + */ + +void ppa_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: + ppa_sg = ints[3]; + case 2: + ppa_hosts[x].mode = ints[2]; + parbus_base[x] = ints[1]; + break; + default: + printk("PPA: I only use between 2 to 3 parameters.\n"); + break; + } + x++; + } +#else +Scsi_Host_Template driver_template = PPA; +#include "scsi_module.c" +#endif + +/* + * Start of Chipset kludges + */ + +#if HAVE_PC87332 > 0 +#warning PC87332 Kludge code included +static inline int pc87332_port(int host_no) +{ + /* A routine to detect and kludge pc87332 chipsets into the + * "optimum" mode for parallel port data transfer. + * This assumes EPP is better than ECP... + * (Which it is for disk drives but not printers and scanners) + */ + int base = ppa_hosts[host_no].base; + + /* This is where an pc87332 can hide */ + unsigned short index_addr[4] = + { + 0x0398, 0x026e, 0x015c, 0x002e + }; + + /* Bits 0&1 of FAR (Function Address Register) which specify where + * the LPT port will show up at. + */ + unsigned short port_ref[4] = + { + 0x378, 0x3bc, 0x278, 0xffff + }; + + unsigned char a; + int loop; + + for (loop = 0; loop < 4; loop++) { + /* Clear the "wax" out of the pc87332, only needed after hard + * reset. + */ + inb(index_addr[loop]); + inb(index_addr[loop]); + inb(index_addr[loop]); + inb(index_addr[loop]); + + /* Anyone home ?? */ + outb(0xff, index_addr[loop]); + a = inb(index_addr[loop]); + switch (a) { + case (0x0f): /* PC87732 */ + break; + case (0x1f): /* PC87306 */ + break; + case (0x7f): /* PC87??? */ + break; + default: + continue; + } /* Is this pc87332 on the desired port */ + outb(0x01, index_addr[loop]); + a = inb(index_addr[loop] + 1); + if (port_ref[a & 0x03] != base) + continue; + + /* Found a pc87332 */ + printk("NatSemi PC87332 (or variant) at 0x%04x\n", base); + + /* Try to enable EPP modes + * with hardware data direction + */ + if (base != 0x3bc) { + /* EPP 1.9 */ + outb(0x04, index_addr[loop]); + a = inb(index_addr[loop] + 1); + printk("Old reg1 = %02x\n", a); + /* 0x01 for EPP 1.7, 0x03 for EPP 1.9, 0x0c for ECP */ + a = (a & 0xf0) | 0x03; + outb(a, index_addr[loop] + 1); + outb(a, index_addr[loop] + 1); + + /* Software data direction selection */ + outb(0x02, index_addr[loop]); + a = inb(index_addr[loop] + 1); + printk("Old reg2 = %02x\n", a); + /* 0x80 for software, 0x00 for hardware */ + a = (a & 0x7f) | 0x80; + outb(a, index_addr[loop] + 1); + outb(a, index_addr[loop] + 1); + ppa_hosts[host_no].mode = PPA_EPP_32; + } else { + /* There is not enough address space for the 0x3bc port + * to have EPP registers so we will kludge it into an + * ECP + * port to allow bi-directional byte mode... + */ + /* ECP */ + outb(0x04, index_addr[loop]); + a = inb(index_addr[loop] + 1); + a = (a & 0xfb) | 0x06; + outb(a, index_addr[loop] + 1); + outb(a, index_addr[loop] + 1); + ppa_hosts[host_no].mode = PPA_PS2; + } + + outb(0x04, index_addr[loop]); + a = inb(index_addr[loop] + 1); + return ppa_hosts[host_no].mode; + } + return 0; + } +#else +#define pc87332_port(x) +#endif /* HAVE_PC87332 */ + +static inline int generic_port(int host_no) +{ + /* Generic parallel port detection + * This will try to discover if the port is + * EPP, ECP, PS/2 or NIBBLE (In that order, approx....) + */ + unsigned int save_ctr, save_ecr, r; + int ppb = PPA_BASE(host_no); + + save_ctr = r_ctr(ppb); + save_ecr = r_ecr(ppb); + r = port_probe(ppb); + w_ecr(ppb, save_ecr); + w_ctr(ppb, save_ctr); + + if (r & PPA_PROBE_SPP) + ppa_hosts[host_no].mode = PPA_NIBBLE; + + if (r & PPA_PROBE_PS2) { + ppa_hosts[host_no].mode = PPA_PS2; + if (r & PPA_PROBE_ECR) + w_ecr(ppb, 0x20); + } + if ((r & PPA_PROBE_EPP17) || (r & PPA_PROBE_EPP19)) { + /* ppa_hosts[host_no].mode = PPA_EPP_32; */ + if (r & PPA_PROBE_ECR) + w_ecr(ppb, 0x80); + } + return ppa_hosts[host_no].mode; +} + +int ppa_detect(Scsi_Host_Template * host) +{ + struct Scsi_Host *hreg; + int ports; + int i, nhosts; + unsigned short ppb; + + printk("ppa: Version %s\n", PPA_VERSION); + nhosts = 0; + + for (i = 0; i < parbus_no; i++) { + if (parbus_base[i] == 0x0000) + continue; + ppb = ppa_hosts[i].base = parbus_base[i]; + + /* sanity checks */ + if (check_region(parbus_base[i], + (parbus_base[i] == 0x03bc) ? 3 : 8)) + continue; + + pc87332_port(i); + if (!generic_port(i)) + continue; + + if (ppa_init(i)) + continue; + + /* now the glue ... */ + switch (ppa_hosts[i].mode) { + case PPA_NIBBLE: + 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; + } + request_region(ppa_hosts[i].base, ports, "ppa"); + host->can_queue = PPA_CAN_QUEUE; + host->sg_tablesize = ppa_sg; + hreg = scsi_register(host, 0); + hreg->io_port = ppa_hosts[i].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) + return 0; + 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, "Port : 0x%04x\n", ppa_hosts[i].base); + len += sprintf(buffer + len, "Mode : %s\n", PPA_MODE_STRING[ppa_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; +} /* end of ppa.c */ +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 occurred */ + 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... + * <output allocation> : <input allocation> : <trashed registers> + */ + 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... + * <output allocation> : <input allocation> : <trashed registers> + */ + 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... + * <output allocation> : <input allocation> : <trashed registers> + */ + 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); +#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC + 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); +#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC + r = ppa_epp_out(ppb + 4, ppb + 1, buffer, len); +#else + if (!(((long) buffer | len) & 0x03)) + outsl(ppb + 4, buffer, len >> 2); + else + 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); +#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC + 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); +#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC + r = ppa_epp_in(ppb + 4, ppb + 1, buffer, len); + #else + if (!(((long) buffer | len) & 0x03)) + insl(ppb + 4, buffer, len >> 2); + else + 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); + + 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); + + 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 */ +} + +/* + * 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); + + 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 have occurred + * 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 until 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 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; +} + +#define PPA_ID "ppa: " + +int port_probe(unsigned short port) +{ + int retv = 0; + unsigned char a, b, c; + unsigned int i, j; + + + printk(PPA_ID "Probing port %04x\n", port); + +/* ##### ###### ###### + * # # # # # # + * # # # # # + * ##### ###### ###### + * # # # + * # # # # + * ##### # # + */ + + outb(0x0c, port + 0x402); + outb(0x0c, port + 0x002); + outb(0x55, port); + a = inb(port); + if (a != 0x55) + return retv; + printk(PPA_ID " SPP port present\n"); + + retv += PPA_PROBE_SPP; + +/* ####### ##### ###### + * # # # # # + * # # # # + * ##### # ###### + * # # # + * # # # # + * ####### ##### # + */ + + for (i = 1024; i > 0; i--) { /* clear at most 1k of data from FIFO */ + a = inb(port + 0x402); + if ((a & 0x03) == 0x03) + goto no_ecp; + if (a & 0x01) + break; + inb(port + 0x400); /* Remove byte from FIFO */ + } + + if (i <= 0) + goto no_ecp; + + b = a ^ 3; + outb(b, port + 0x402); + c = inb(port + 0x402); + + if (a == c) { + outb(0xc0, port + 0x402); /* FIFO test */ + j = 0; + while (!(inb(port + 0x402) & 0x01) && (j < 1024)) { + inb(port + 0x400); + j++; + } + if (j >= 1024) + goto no_ecp; + i = 0; + j = 0; + while (!(inb(port + 0x402) & 0x02) && (j < 1024)) { + outb(0x00, port + 0x400); + i++; + j++; + } + if (j >= 1024) + goto no_ecp; + j = 0; + while (!(inb(port + 0x402) & 0x01) && (j < 1024)) { + inb(port + 0x400); + j++; + } + if (j >= 1024) + goto no_ecp; + printk(PPA_ID " ECP with a %i byte FIFO present\n", i); + + retv += PPA_PROBE_ECR; + } +/* ###### ##### ##### + * # # # # # # + * # # # # + * ###### ##### ##### + * # # # + * # # # # + * # ##### ####### + */ + + no_ecp: + if (retv & PPA_PROBE_ECR) + outb(0x20, port + 0x402); + + outb(0x55, port); + outb(0x0c, port + 2); + a = inb(port); + outb(0x55, port); + outb(0x2c, port + 2); + b = inb(port); + if (a != b) { + printk(PPA_ID " PS/2 bidirectional port present\n"); + retv += PPA_PROBE_PS2; + } +/* ####### ###### ###### + * # # # # # + * # # # # # + * ##### ###### ###### + * # # # + * # # # + * ####### # # + */ + + if (port & 0x007) { + printk(PPA_ID " EPP not supported at this address\n"); + return retv; + } + if (retv & PPA_PROBE_ECR) { + for (i = 0x00; i < 0x80; i += 0x20) { + outb(i, port + 0x402); + + a = inb(port + 1); + outb(a, port + 1); + outb(a & 0xfe, port + 1); + a = inb(port + 1); + if (!(a & 0x01)) { + printk(PPA_ID " Failed Intel bug check. (Phony EPP in ECP)\n"); + return retv; + } + } + printk(PPA_ID " Passed Intel bug check.\n"); + outb(0x80, port + 0x402); + } + a = inb(port + 1); + outb(a, port + 1); + outb(a & 0xfe, port + 1); + a = inb(port + 1); + + if (a & 0x01) { + outb(0x0c, port + 0x402); + outb(0x0c, port + 0x002); + return retv; + } + + outb(0x04, port + 2); + inb(port + 4); + a = inb(port + 1); + outb(a, port + 1); + outb(a & 0xfe, port + 1); + + if (a & 0x01) { + printk(PPA_ID " EPP 1.9 with hardware direction protocol\n"); + retv += PPA_PROBE_EPP19; + } else { + /* The EPP timeout bit was not set, this could either be: + * EPP 1.7 + * EPP 1.9 with software direction + */ + outb(0x24, port + 2); + inb(port + 4); + a = inb(port + 1); + outb(a, port + 1); + outb(a & 0xfe, port + 1); + if (a & 0x01) { + printk(PPA_ID " EPP 1.9 with software direction protocol\n"); + retv += PPA_PROBE_EPP19; + } else { + printk(PPA_ID " EPP 1.7\n"); + retv += PPA_PROBE_EPP17; + } + } + + outb(0x0c, port + 0x402); + outb(0x0c, port + 0x002); + return retv; +} |