diff options
Diffstat (limited to 'drivers/block/paride/paride.c')
| -rw-r--r-- | drivers/block/paride/paride.c | 434 |
1 files changed, 434 insertions, 0 deletions
diff --git a/drivers/block/paride/paride.c b/drivers/block/paride/paride.c new file mode 100644 index 000000000..48c50f11f --- /dev/null +++ b/drivers/block/paride/paride.c @@ -0,0 +1,434 @@ +/* + paride.c (c) 1997-8 Grant R. Guenther <grant@torque.net> + Under the terms of the GNU General Public License. + + This is the base module for the family of device drivers + that support parallel port IDE devices. + +*/ + +/* Changes: + + 1.01 GRG 1998.05.03 Use spinlocks + 1.02 GRG 1998.05.05 init_proto, release_proto, ktti + 1.03 GRG 1998.08.15 eliminate compiler warning + 1.04 GRG 1998.11.28 added support for FRIQ + 1.05 TMW 2000.06.06 use parport_find_number instead of + parport_enumerate + 1.06 TMW 2001.03.26 more sane parport-or-not resource management +*/ + +#define PI_VERSION "1.06" + +#include <linux/module.h> +#include <linux/kmod.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/string.h> +#include <linux/spinlock.h> +#include <linux/wait.h> +#include <linux/sched.h> /* TASK_* */ +#include <linux/parport.h> + +#include "paride.h" + +MODULE_LICENSE("GPL"); + +#define MAX_PROTOS 32 + +static struct pi_protocol *protocols[MAX_PROTOS]; + +static DEFINE_SPINLOCK(pi_spinlock); + +void pi_write_regr(PIA * pi, int cont, int regr, int val) +{ + pi->proto->write_regr(pi, cont, regr, val); +} + +EXPORT_SYMBOL(pi_write_regr); + +int pi_read_regr(PIA * pi, int cont, int regr) +{ + return pi->proto->read_regr(pi, cont, regr); +} + +EXPORT_SYMBOL(pi_read_regr); + +void pi_write_block(PIA * pi, char *buf, int count) +{ + pi->proto->write_block(pi, buf, count); +} + +EXPORT_SYMBOL(pi_write_block); + +void pi_read_block(PIA * pi, char *buf, int count) +{ + pi->proto->read_block(pi, buf, count); +} + +EXPORT_SYMBOL(pi_read_block); + +static void pi_wake_up(void *p) +{ + PIA *pi = (PIA *) p; + unsigned long flags; + void (*cont) (void) = NULL; + + spin_lock_irqsave(&pi_spinlock, flags); + + if (pi->claim_cont && !parport_claim(pi->pardev)) { + cont = pi->claim_cont; + pi->claim_cont = NULL; + pi->claimed = 1; + } + + spin_unlock_irqrestore(&pi_spinlock, flags); + + wake_up(&(pi->parq)); + + if (cont) + cont(); +} + +int pi_schedule_claimed(PIA * pi, void (*cont) (void)) +{ + unsigned long flags; + + spin_lock_irqsave(&pi_spinlock, flags); + if (pi->pardev && parport_claim(pi->pardev)) { + pi->claim_cont = cont; + spin_unlock_irqrestore(&pi_spinlock, flags); + return 0; + } + pi->claimed = 1; + spin_unlock_irqrestore(&pi_spinlock, flags); + return 1; +} +EXPORT_SYMBOL(pi_schedule_claimed); + +void pi_do_claimed(PIA * pi, void (*cont) (void)) +{ + if (pi_schedule_claimed(pi, cont)) + cont(); +} + +EXPORT_SYMBOL(pi_do_claimed); + +static void pi_claim(PIA * pi) +{ + if (pi->claimed) + return; + pi->claimed = 1; + if (pi->pardev) + wait_event(pi->parq, + !parport_claim((struct pardevice *) pi->pardev)); +} + +static void pi_unclaim(PIA * pi) +{ + pi->claimed = 0; + if (pi->pardev) + parport_release((struct pardevice *) (pi->pardev)); +} + +void pi_connect(PIA * pi) +{ + pi_claim(pi); + pi->proto->connect(pi); +} + +EXPORT_SYMBOL(pi_connect); + +void pi_disconnect(PIA * pi) +{ + pi->proto->disconnect(pi); + pi_unclaim(pi); +} + +EXPORT_SYMBOL(pi_disconnect); + +static void pi_unregister_parport(PIA * pi) +{ + if (pi->pardev) { + parport_unregister_device((struct pardevice *) (pi->pardev)); + pi->pardev = NULL; + } +} + +void pi_release(PIA * pi) +{ + pi_unregister_parport(pi); + if (pi->proto->release_proto) + pi->proto->release_proto(pi); + module_put(pi->proto->owner); +} + +EXPORT_SYMBOL(pi_release); + +static int default_test_proto(PIA * pi, char *scratch, int verbose) +{ + int j, k; + int e[2] = { 0, 0 }; + + pi->proto->connect(pi); + + for (j = 0; j < 2; j++) { + pi_write_regr(pi, 0, 6, 0xa0 + j * 0x10); + for (k = 0; k < 256; k++) { + pi_write_regr(pi, 0, 2, k ^ 0xaa); + pi_write_regr(pi, 0, 3, k ^ 0x55); + if (pi_read_regr(pi, 0, 2) != (k ^ 0xaa)) + e[j]++; + } + } + pi->proto->disconnect(pi); + + if (verbose) + printk("%s: %s: port 0x%x, mode %d, test=(%d,%d)\n", + pi->device, pi->proto->name, pi->port, + pi->mode, e[0], e[1]); + + return (e[0] && e[1]); /* not here if both > 0 */ +} + +static int pi_test_proto(PIA * pi, char *scratch, int verbose) +{ + int res; + + pi_claim(pi); + if (pi->proto->test_proto) + res = pi->proto->test_proto(pi, scratch, verbose); + else + res = default_test_proto(pi, scratch, verbose); + pi_unclaim(pi); + + return res; +} + +int paride_register(PIP * pr) +{ + int k; + + for (k = 0; k < MAX_PROTOS; k++) + if (protocols[k] && !strcmp(pr->name, protocols[k]->name)) { + printk("paride: %s protocol already registered\n", + pr->name); + return -1; + } + k = 0; + while ((k < MAX_PROTOS) && (protocols[k])) + k++; + if (k == MAX_PROTOS) { + printk("paride: protocol table full\n"); + return -1; + } + protocols[k] = pr; + pr->index = k; + printk("paride: %s registered as protocol %d\n", pr->name, k); + return 0; +} + +EXPORT_SYMBOL(paride_register); + +void paride_unregister(PIP * pr) +{ + if (!pr) + return; + if (protocols[pr->index] != pr) { + printk("paride: %s not registered\n", pr->name); + return; + } + protocols[pr->index] = NULL; +} + +EXPORT_SYMBOL(paride_unregister); + +static int pi_register_parport(PIA * pi, int verbose) +{ + struct parport *port; + + port = parport_find_base(pi->port); + if (!port) + return 0; + + pi->pardev = parport_register_device(port, + pi->device, NULL, + pi_wake_up, NULL, 0, (void *) pi); + parport_put_port(port); + if (!pi->pardev) + return 0; + + init_waitqueue_head(&pi->parq); + + if (verbose) + printk("%s: 0x%x is %s\n", pi->device, pi->port, port->name); + + pi->parname = (char *) port->name; + + return 1; +} + +static int pi_probe_mode(PIA * pi, int max, char *scratch, int verbose) +{ + int best, range; + + if (pi->mode != -1) { + if (pi->mode >= max) + return 0; + range = 3; + if (pi->mode >= pi->proto->epp_first) + range = 8; + if ((range == 8) && (pi->port % 8)) + return 0; + pi->reserved = range; + return (!pi_test_proto(pi, scratch, verbose)); + } + best = -1; + for (pi->mode = 0; pi->mode < max; pi->mode++) { + range = 3; + if (pi->mode >= pi->proto->epp_first) + range = 8; + if ((range == 8) && (pi->port % 8)) + break; + pi->reserved = range; + if (!pi_test_proto(pi, scratch, verbose)) + best = pi->mode; + } + pi->mode = best; + return (best > -1); +} + +static int pi_probe_unit(PIA * pi, int unit, char *scratch, int verbose) +{ + int max, s, e; + + s = unit; + e = s + 1; + + if (s == -1) { + s = 0; + e = pi->proto->max_units; + } + + if (!pi_register_parport(pi, verbose)) + return 0; + + if (pi->proto->test_port) { + pi_claim(pi); + max = pi->proto->test_port(pi); + pi_unclaim(pi); + } else + max = pi->proto->max_mode; + + if (pi->proto->probe_unit) { + pi_claim(pi); + for (pi->unit = s; pi->unit < e; pi->unit++) + if (pi->proto->probe_unit(pi)) { + pi_unclaim(pi); + if (pi_probe_mode(pi, max, scratch, verbose)) + return 1; + pi_unregister_parport(pi); + return 0; + } + pi_unclaim(pi); + pi_unregister_parport(pi); + return 0; + } + + if (!pi_probe_mode(pi, max, scratch, verbose)) { + pi_unregister_parport(pi); + return 0; + } + return 1; + +} + +int pi_init(PIA * pi, int autoprobe, int port, int mode, + int unit, int protocol, int delay, char *scratch, + int devtype, int verbose, char *device) +{ + int p, k, s, e; + int lpts[7] = { 0x3bc, 0x378, 0x278, 0x268, 0x27c, 0x26c, 0 }; + + s = protocol; + e = s + 1; + + if (!protocols[0]) + request_module("paride_protocol"); + + if (autoprobe) { + s = 0; + e = MAX_PROTOS; + } else if ((s < 0) || (s >= MAX_PROTOS) || (port <= 0) || + (!protocols[s]) || (unit < 0) || + (unit >= protocols[s]->max_units)) { + printk("%s: Invalid parameters\n", device); + return 0; + } + + for (p = s; p < e; p++) { + struct pi_protocol *proto = protocols[p]; + if (!proto) + continue; + /* still racy */ + if (!try_module_get(proto->owner)) + continue; + pi->proto = proto; + pi->private = 0; + if (proto->init_proto && proto->init_proto(pi) < 0) { + pi->proto = NULL; + module_put(proto->owner); + continue; + } + if (delay == -1) + pi->delay = pi->proto->default_delay; + else + pi->delay = delay; + pi->devtype = devtype; + pi->device = device; + + pi->parname = NULL; + pi->pardev = NULL; + init_waitqueue_head(&pi->parq); + pi->claimed = 0; + pi->claim_cont = NULL; + + pi->mode = mode; + if (port != -1) { + pi->port = port; + if (pi_probe_unit(pi, unit, scratch, verbose)) + break; + pi->port = 0; + } else { + k = 0; + while ((pi->port = lpts[k++])) + if (pi_probe_unit + (pi, unit, scratch, verbose)) + break; + if (pi->port) + break; + } + if (pi->proto->release_proto) + pi->proto->release_proto(pi); + module_put(proto->owner); + } + + if (!pi->port) { + if (autoprobe) + printk("%s: Autoprobe failed\n", device); + else + printk("%s: Adapter not found\n", device); + return 0; + } + + if (pi->parname) + printk("%s: Sharing %s at 0x%x\n", pi->device, + pi->parname, pi->port); + + pi->proto->log_adapter(pi, scratch, verbose); + + return 1; +} + +EXPORT_SYMBOL(pi_init); |