NetBSD-5.0.2/sys/dev/isa/isv.c
/* $NetBSD: isv.c,v 1.2 2008/04/28 20:23:52 martin Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by David Young.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: isv.c,v 1.2 2008/04/28 20:23:52 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <uvm/uvm.h>
#include <sys/bus.h>
#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
#include <dev/isa/isvio.h>
#define ISV_CONTROL 0x0 /* control: write-only */
#define ISV_CONTROL_MODE_MASK __BIT(0)
#define ISV_CONTROL_MODE_CAPTURE __SHIFTIN(0, ISV_CONTROL_MODE_MASK)
#define ISV_CONTROL_MODE_READ __SHIFTIN(1, ISV_CONTROL_MODE_MASK)
#define ISV_CONTROL_COUNTER_MASK __BIT(1)
#define ISV_CONTROL_COUNTER_RESET __SHIFTIN(1, ISV_CONTROL_COUNTER_MASK)
#define ISV_CONTROL_COUNTER_AUTOINC __SHIFTIN(0, ISV_CONTROL_COUNTER_MASK)
#define ISV_DATA ISV_CONTROL /* data: read-only */
#define ISV_STATUS 0x2 /* status: read-only */
#define ISV_STATUS_VIDEO_MASK __BIT(15)
#define ISV_STATUS_VIDEO_RETRACE __SHIFTIN(0, ISV_STATUS_VIDEO_MASK)
#define ISV_STATUS_VIDEO_WRITE __SHIFTIN(1, ISV_STATUS_VIDEO_MASK)
struct isv_regs {
bus_space_tag_t ir_bt;
bus_space_handle_t ir_bh;
};
enum isv_state {
ISV_S_CAPTURE0 = 0
, ISV_S_CAPTURE1 = 1
, ISV_S_CAPTURE2 = 2
, ISV_S_RETRACE = 3
};
struct isv_softc {
struct isv_regs sc_ir;
device_t sc_dev;
uint16_t *sc_frame;
int sc_speed;
};
extern struct cfdriver isv_cd;
static dev_type_ioctl(isv_ioctl);
static dev_type_open(isv_open);
static dev_type_mmap(isv_mmap);
static int isv_capture(struct isv_softc *);
static int isv_match(device_t, cfdata_t, void *);
static void isv_attach(device_t, device_t, void *);
static int isv_detach(device_t, int);
static uint16_t isv_read(struct isv_regs *, bus_size_t);
static void isv_write(struct isv_regs *, bus_size_t, uint16_t);
static bool isv_retrace(struct isv_regs *);
static int isv_retrace_wait(struct isv_regs *, int *,
const struct timeval *);
static int isv_capture_wait(struct isv_regs *, int *,
const struct timeval *);
static bool isv_delta(int *, bool);
static int isv_probe(struct isv_regs *);
CFATTACH_DECL_NEW(isv_isa, sizeof(struct isv_softc),
isv_match, isv_attach, isv_detach, NULL);
const struct cdevsw isv_cdevsw = {
isv_open, nullclose, noread, nowrite, isv_ioctl,
nostop, notty, nopoll, isv_mmap, nokqfilter, D_OTHER
};
static uint16_t
isv_read(struct isv_regs *ir, bus_size_t reg)
{
return bus_space_read_2(ir->ir_bt, ir->ir_bh, reg);
}
static void
isv_write(struct isv_regs *ir, bus_size_t reg, uint16_t val)
{
bus_space_write_2(ir->ir_bt, ir->ir_bh, reg, val);
}
static bool
isv_retrace(struct isv_regs *ir)
{
uint16_t video;
video = isv_read(ir, ISV_STATUS) & ISV_STATUS_VIDEO_MASK;
return video == ISV_STATUS_VIDEO_RETRACE;
}
#define state_and_input(__state, __retrace) \
(((__state) << 1) | ((__retrace) ? 1 : 0))
static bool
isv_delta(int *state, bool retrace)
{
bool transition = false;
switch (state_and_input(*state, retrace)) {
case state_and_input(ISV_S_CAPTURE0, false):
case state_and_input(ISV_S_RETRACE, true):
break;
case state_and_input(ISV_S_CAPTURE2, true):
transition = true;
/*FALLTHROUGH*/
case state_and_input(ISV_S_CAPTURE1, true):
case state_and_input(ISV_S_CAPTURE0, true):
(*state)++;
break;
case state_and_input(ISV_S_RETRACE, false):
transition = true;
/*FALLTHROUGH*/
case state_and_input(ISV_S_CAPTURE2, false):
case state_and_input(ISV_S_CAPTURE1, false):
*state = ISV_S_CAPTURE0;
break;
}
return transition;
}
static int
isv_probe(struct isv_regs *ir)
{
int state, transitions;
struct timeval end, now,
wait = {.tv_sec = 0, .tv_usec = 1000000 * 4 / 30};
aprint_debug("%s: resetting\n", __func__);
isv_write(ir, ISV_CONTROL,
ISV_CONTROL_MODE_CAPTURE|ISV_CONTROL_COUNTER_AUTOINC);
aprint_debug("%s: waiting\n", __func__);
microtime(&now);
timeradd(&now, &wait, &end);
state = transitions = 0;
do {
if (isv_delta(&state, isv_retrace(ir)))
transitions++;
if (state == ISV_S_CAPTURE0 || state == ISV_S_RETRACE)
microtime(&now);
} while (timercmp(&now, &end, <));
aprint_debug("%s: %d transitions\n", __func__, transitions);
return transitions >= 4 && transitions <= 10;
}
static int
isv_match(device_t parent, cfdata_t match, void *aux)
{
struct isv_regs ir;
struct isa_attach_args *ia = aux;
int rv;
/* Must supply an address */
if (ia->ia_nio < 1 || ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
return 0;
ir.ir_bt = ia->ia_iot;
if (bus_space_map(ir.ir_bt, ia->ia_io[0].ir_addr, 8, 0, &ir.ir_bh))
return 0;
rv = isv_probe(&ir);
bus_space_unmap(ir.ir_bt, ir.ir_bh, 8);
if (rv) {
ia->ia_nio = 1;
ia->ia_io[0].ir_size = 8;
ia->ia_niomem = 0;
ia->ia_nirq = 0;
ia->ia_ndrq = 0;
}
return rv;
}
static void
isv_attach(device_t parent, device_t self, void *aux)
{
struct isv_softc *sc = device_private(self);
struct isv_regs *ir = &sc->sc_ir;
struct isa_attach_args *ia = aux;
ir->ir_bt = ia->ia_iot;
if (bus_space_map(ir->ir_bt, ia->ia_io[0].ir_addr, 8, 0, &ir->ir_bh)) {
aprint_error(": can't map i/o space\n");
return;
}
/* Bus-independent attachment */
sc->sc_dev = self;
aprint_normal(": IDEC Supervision/16\n");
/* TBD */
}
int
isv_open(dev_t dev, int flag, int devtype, lwp_t *l)
{
vaddr_t va;
struct isv_softc *sc = device_lookup_private(&isv_cd, minor(dev));
if (sc == NULL)
return ENXIO;
if (sc->sc_frame != NULL)
return 0;
if ((va = uvm_km_alloc(kernel_map, ISV_WIDTH * ISV_LINES, PAGE_SIZE,
UVM_KMF_WIRED|UVM_KMF_ZERO|UVM_KMF_CANFAIL|UVM_KMF_WAITVA)) == 0)
return ENOMEM;
sc->sc_frame = (uint16_t *)(void *)va;
return 0;
}
/* wait for retrace */
static int
isv_retrace_wait(struct isv_regs *ir, int *state, const struct timeval *end)
{
struct timeval now;
for (;;) {
if (!isv_delta(state, isv_retrace(ir))) {
microtime(&now);
continue;
}
if (*state == ISV_S_RETRACE)
break;
if (*state != ISV_S_CAPTURE0)
continue;
microtime(&now);
if (timercmp(&now, end, >=))
return EIO;
}
return 0;
}
/* wait for capture mode */
static int
isv_capture_wait(struct isv_regs *ir, int *state, const struct timeval *end)
{
struct timeval now;
for (;;) {
if (!isv_delta(state, isv_retrace(ir))) {
microtime(&now);
continue;
}
if (*state != ISV_S_RETRACE)
break;
microtime(&now);
if (timercmp(&now, end, >=))
return EIO;
}
return 0;
}
static int
isv_capture(struct isv_softc *sc)
{
int speed;
uint16_t discard;
int rc, state = ISV_S_CAPTURE0;
struct timeval diff, end, start, stop;
static const struct timeval wait = {.tv_sec = 0, .tv_usec = 200000};
struct isv_regs *ir = &sc->sc_ir;
if (sc->sc_frame == NULL)
return EAGAIN;
microtime(&start);
timeradd(&start, &wait, &end);
speed = sc->sc_speed;
sc->sc_speed = 0;
if (speed < 1 && (rc = isv_retrace_wait(ir, &state, &end)) != 0)
return rc;
if (speed < 2 && (rc = isv_capture_wait(ir, &state, &end)) != 0)
return rc;
if ((rc = isv_retrace_wait(ir, &state, &end)) != 0)
return rc;
microtime(&stop);
timersub(&stop, &start, &diff);
aprint_debug_dev(sc->sc_dev, "%ssync in %ld.%06ld seconds\n",
(speed < 1) ? "" : ((speed < 2) ? "faster " : "fastest "),
diff.tv_sec, diff.tv_usec);
microtime(&start);
/* enter read mode, then toggle counter mode,
* autoinc -> reset -> autoinc, so that we start reading
* at the top of the frame.
*/
isv_write(ir, ISV_CONTROL,
ISV_CONTROL_MODE_READ|ISV_CONTROL_COUNTER_AUTOINC);
isv_write(ir, ISV_CONTROL,
ISV_CONTROL_MODE_READ|ISV_CONTROL_COUNTER_RESET);
isv_write(ir, ISV_CONTROL,
ISV_CONTROL_MODE_READ|ISV_CONTROL_COUNTER_AUTOINC);
/* read one dummy word to prime the state machine on the
* image capture board
*/
discard = isv_read(ir, ISV_DATA);
bus_space_read_multi_stream_2(ir->ir_bt, ir->ir_bh, ISV_DATA,
sc->sc_frame, ISV_WIDTH * ISV_LINES / 2);
/* restore to initial conditions */
isv_write(ir, ISV_CONTROL,
ISV_CONTROL_MODE_CAPTURE|ISV_CONTROL_COUNTER_AUTOINC);
microtime(&stop);
timersub(&stop, &start, &diff);
aprint_debug_dev(sc->sc_dev, "read in %ld.%06ld seconds\n",
diff.tv_sec, diff.tv_usec);
state = 0;
if (isv_retrace_wait(ir, &state, &end) != 0)
return 0;
sc->sc_speed++;
if (isv_capture_wait(ir, &state, &end) != 0)
return 0;
sc->sc_speed++;
return 0;
}
int
isv_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l)
{
struct isv_cmd ic;
struct isv_softc *sc = device_lookup_private(&isv_cd, minor(dev));
if (cmd != ISV_CMD)
return ENOTTY;
memcpy(&ic, data, sizeof(ic));
if (ic.c_cmd != ISV_CMD_READ)
return EINVAL;
ic.c_frameno = 0;
return isv_capture(sc);
}
paddr_t
isv_mmap(dev_t dev, off_t offset, int prot)
{
struct isv_softc *sc = device_lookup_private(&isv_cd, minor(dev));
paddr_t pa;
if ((prot & ~(VM_PROT_READ)) != 0)
return -1;
if (sc->sc_frame == NULL)
return -1;
if (offset >= ISV_WIDTH * ISV_LINES)
return -1;
if (!pmap_extract(pmap_kernel(), (vaddr_t)&sc->sc_frame[offset/2], &pa))
return -1;
return atop(pa);
}
static int
isv_detach(device_t self, int flags)
{
struct isv_softc *sc = device_private(self);
struct isv_regs *ir = &sc->sc_ir;
if (sc->sc_frame != NULL) {
uvm_km_free(kernel_map, (vaddr_t)sc->sc_frame,
ISV_WIDTH * ISV_LINES, UVM_KMF_WIRED);
}
bus_space_unmap(ir->ir_bt, ir->ir_bh, 8);
return 0;
}