ow(4): protocol timings can now be changed as sysctl-s / tunables
I limited potentially infinite timings by 960 us based on a footnote on page 38 of Maxim Integrated Application Note 937, Book of iButton Standards: "In order not to mask interrupt signalling by other devices on the 1–Wire bus, tRSTL + tR should always be less than 960 us." MFC after: 3 weeks
This commit is contained in:
Andriy Gapon
parent
e0fbc30476
commit
1bce6aaf96
150
sys/dev/ow/ow.c
150
sys/dev/ow/ow.c
@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
|
||||
#include <sys/malloc.h>
|
||||
#include <sys/module.h>
|
||||
#include <sys/mutex.h>
|
||||
#include <sys/sysctl.h>
|
||||
|
||||
#include <dev/ow/ow.h>
|
||||
#include <dev/ow/owll.h>
|
||||
@ -75,35 +76,138 @@ static void ow_release_bus(device_t ndev, device_t pdev);
|
||||
|
||||
static MALLOC_DEFINE(M_OW, "ow", "House keeping data for 1wire bus");
|
||||
|
||||
static const struct ow_timing timing_regular_min = {
|
||||
.t_slot = 60,
|
||||
.t_low0 = 60,
|
||||
.t_low1 = 1,
|
||||
.t_release = 0,
|
||||
.t_rec = 1,
|
||||
.t_rdv = 15, /* fixed */
|
||||
.t_rstl = 480,
|
||||
.t_rsth = 480,
|
||||
.t_pdl = 60,
|
||||
.t_pdh = 15,
|
||||
.t_lowr = 1,
|
||||
};
|
||||
|
||||
static const struct ow_timing timing_regular_max = {
|
||||
.t_slot = 120,
|
||||
.t_low0 = 120,
|
||||
.t_low1 = 15,
|
||||
.t_release = 45,
|
||||
.t_rec = 960, /* infinity */
|
||||
.t_rdv = 15, /* fixed */
|
||||
.t_rstl = 960, /* infinity */
|
||||
.t_rsth = 960, /* infinity */
|
||||
.t_pdl = 240, /* 60us to 240us */
|
||||
.t_pdh = 60, /* 15us to 60us */
|
||||
.t_lowr = 15, /* 1us */
|
||||
};
|
||||
|
||||
static struct ow_timing timing_regular = {
|
||||
.t_slot = 60, /* 60 to 120 */
|
||||
.t_low0 = 60, /* really 60 to 120 */
|
||||
.t_low1 = 1, /* really 1 to 15 */
|
||||
.t_release = 45, /* <= 45us */
|
||||
.t_rec = 15, /* at least 1us */
|
||||
.t_rdv = 15, /* 15us */
|
||||
.t_rstl = 480, /* 480us or more */
|
||||
.t_rsth = 480, /* 480us or more */
|
||||
.t_pdl = 60, /* 60us to 240us */
|
||||
.t_pdh = 60, /* 15us to 60us */
|
||||
.t_lowr = 1, /* 1us */
|
||||
.t_slot = 60, /* 60 <= t < 120 */
|
||||
.t_low0 = 60, /* 60 <= t < t_slot < 120 */
|
||||
.t_low1 = 1, /* 1 <= t < 15 */
|
||||
.t_release = 45, /* 0 <= t < 45 */
|
||||
.t_rec = 15, /* 1 <= t < inf */
|
||||
.t_rdv = 15, /* t == 15 */
|
||||
.t_rstl = 480, /* 480 <= t < inf */
|
||||
.t_rsth = 480, /* 480 <= t < inf */
|
||||
.t_pdl = 60, /* 60 <= t < 240 */
|
||||
.t_pdh = 60, /* 15 <= t < 60 */
|
||||
.t_lowr = 1, /* 1 <= t < 15 */
|
||||
};
|
||||
|
||||
/* NB: Untested */
|
||||
static struct ow_timing timing_overdrive = {
|
||||
.t_slot = 11, /* 6us to 16us */
|
||||
.t_low0 = 6, /* really 6 to 16 */
|
||||
.t_low1 = 1, /* really 1 to 2 */
|
||||
.t_release = 4, /* <= 4us */
|
||||
.t_rec = 1, /* at least 1us */
|
||||
.t_rdv = 2, /* 2us */
|
||||
.t_rstl = 48, /* 48us to 80us */
|
||||
.t_rsth = 48, /* 48us or more */
|
||||
.t_pdl = 8, /* 8us to 24us */
|
||||
.t_pdh = 2, /* 2us to 6us */
|
||||
.t_lowr = 1, /* 1us */
|
||||
static const struct ow_timing timing_overdrive_min = {
|
||||
.t_slot = 6,
|
||||
.t_low0 = 6,
|
||||
.t_low1 = 1,
|
||||
.t_release = 0,
|
||||
.t_rec = 1,
|
||||
.t_rdv = 2, /* fixed */
|
||||
.t_rstl = 48,
|
||||
.t_rsth = 48,
|
||||
.t_pdl = 8,
|
||||
.t_pdh = 2,
|
||||
.t_lowr = 1,
|
||||
};
|
||||
|
||||
static const struct ow_timing timing_overdrive_max = {
|
||||
.t_slot = 16,
|
||||
.t_low0 = 16,
|
||||
.t_low1 = 2,
|
||||
.t_release = 4,
|
||||
.t_rec = 960, /* infinity */
|
||||
.t_rdv = 2, /* fixed */
|
||||
.t_rstl = 80,
|
||||
.t_rsth = 960, /* infinity */
|
||||
.t_pdl = 24,
|
||||
.t_pdh = 6,
|
||||
.t_lowr = 2,
|
||||
};
|
||||
|
||||
static struct ow_timing timing_overdrive = {
|
||||
.t_slot = 11, /* 6 <= t < 16 */
|
||||
.t_low0 = 6, /* 6 <= t < t_slot < 16 */
|
||||
.t_low1 = 1, /* 1 <= t < 2 */
|
||||
.t_release = 4, /* 0 <= t < 4 */
|
||||
.t_rec = 1, /* 1 <= t < inf */
|
||||
.t_rdv = 2, /* t == 2 */
|
||||
.t_rstl = 48, /* 48 <= t < 80 */
|
||||
.t_rsth = 48, /* 48 <= t < inf */
|
||||
.t_pdl = 8, /* 8 <= t < 24 */
|
||||
.t_pdh = 2, /* 2 <= t < 6 */
|
||||
.t_lowr = 1, /* 1 <= t < 2 */
|
||||
};
|
||||
|
||||
SYSCTL_DECL(_hw);
|
||||
SYSCTL_NODE(_hw, OID_AUTO, ow, CTLFLAG_RD, 0, "1-Wire protocol");
|
||||
SYSCTL_NODE(_hw_ow, OID_AUTO, regular, CTLFLAG_RD, 0,
|
||||
"Regular mode timings");
|
||||
SYSCTL_NODE(_hw_ow, OID_AUTO, overdrive, CTLFLAG_RD, 0,
|
||||
"Overdrive mode timings");
|
||||
|
||||
#define _OW_TIMING_SYSCTL(mode, param) \
|
||||
static int \
|
||||
sysctl_ow_timing_ ## mode ## _ ## param(SYSCTL_HANDLER_ARGS) \
|
||||
{ \
|
||||
int val = timing_ ## mode.param; \
|
||||
int err; \
|
||||
err = sysctl_handle_int(oidp, &val, 0, req); \
|
||||
if (err != 0 || req->newptr == NULL) \
|
||||
return (err); \
|
||||
if (val < timing_ ## mode ## _min.param) \
|
||||
return (EINVAL); \
|
||||
else if (val >= timing_ ## mode ## _max.param) \
|
||||
return (EINVAL); \
|
||||
timing_ ## mode.param = val; \
|
||||
return (0); \
|
||||
} \
|
||||
SYSCTL_PROC(_hw_ow_ ## mode, OID_AUTO, param, \
|
||||
CTLTYPE_INT | CTLFLAG_RWTUN, 0, sizeof(int), \
|
||||
sysctl_ow_timing_ ## mode ## _ ## param, "I", \
|
||||
"1-Wire timing parameter in microseconds (-1 resets to default)")
|
||||
|
||||
#define OW_TIMING_SYSCTL(param) \
|
||||
_OW_TIMING_SYSCTL(regular, param); \
|
||||
_OW_TIMING_SYSCTL(overdrive, param)
|
||||
|
||||
OW_TIMING_SYSCTL(t_slot);
|
||||
OW_TIMING_SYSCTL(t_low0);
|
||||
OW_TIMING_SYSCTL(t_low1);
|
||||
OW_TIMING_SYSCTL(t_release);
|
||||
OW_TIMING_SYSCTL(t_rec);
|
||||
OW_TIMING_SYSCTL(t_rdv);
|
||||
OW_TIMING_SYSCTL(t_rstl);
|
||||
OW_TIMING_SYSCTL(t_rsth);
|
||||
OW_TIMING_SYSCTL(t_pdl);
|
||||
OW_TIMING_SYSCTL(t_pdh);
|
||||
OW_TIMING_SYSCTL(t_lowr);
|
||||
|
||||
#undef _OW_TIMING_SYSCTL
|
||||
#undef OW_TIMING_SYSCTL
|
||||
|
||||
static void
|
||||
ow_send_byte(device_t lldev, struct ow_timing *t, uint8_t byte)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user