156fd4834a
(one manual change to fix grammar) Confirmed With: db Approved by: secteam (not really, but this is a comment typo fix)
642 lines
16 KiB
C
642 lines
16 KiB
C
/*-
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* Copyright (c) 2015 M. Warner Losh <imp@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/errno.h>
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#include <sys/libkern.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <dev/ow/ow.h>
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#include <dev/ow/owll.h>
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#include <dev/ow/own.h>
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/*
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* lldev - link level device
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* ndev - network / transport device (this module)
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* pdev - presentation device (children of this module)
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*/
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typedef int ow_enum_fn(device_t, device_t);
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typedef int ow_found_fn(device_t, romid_t);
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struct ow_softc
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{
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device_t dev; /* Newbus driver back pointer */
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struct mtx mtx; /* bus mutex */
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device_t owner; /* bus owner, if != NULL */
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};
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struct ow_devinfo
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{
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romid_t romid;
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};
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static int ow_acquire_bus(device_t ndev, device_t pdev, int how);
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static void ow_release_bus(device_t ndev, device_t pdev);
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#define OW_LOCK(_sc) mtx_lock(&(_sc)->mtx)
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#define OW_UNLOCK(_sc) mtx_unlock(&(_sc)->mtx)
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#define OW_LOCK_DESTROY(_sc) mtx_destroy(&_sc->mtx)
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#define OW_ASSERT_LOCKED(_sc) mtx_assert(&_sc->mtx, MA_OWNED)
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#define OW_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->mtx, MA_NOTOWNED)
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static MALLOC_DEFINE(M_OW, "ow", "House keeping data for 1wire bus");
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static struct ow_timing timing_regular = {
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.t_slot = 60, /* 60 to 120 */
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.t_low0 = 60, /* really 60 to 120 */
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.t_low1 = 1, /* really 1 to 15 */
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.t_release = 45, /* <= 45us */
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.t_rec = 1, /* at least 1us */
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.t_rdv = 15, /* 15us */
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.t_rstl = 480, /* 480us or more */
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.t_rsth = 480, /* 480us or more */
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.t_pdl = 60, /* 60us to 240us */
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.t_pdh = 60, /* 15us to 60us */
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.t_lowr = 1, /* 1us */
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};
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/* NB: Untested */
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static struct ow_timing timing_overdrive = {
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.t_slot = 11, /* 6us to 16us */
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.t_low0 = 6, /* really 6 to 16 */
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.t_low1 = 1, /* really 1 to 2 */
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.t_release = 4, /* <= 4us */
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.t_rec = 1, /* at least 1us */
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.t_rdv = 2, /* 2us */
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.t_rstl = 48, /* 48us to 80us */
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.t_rsth = 48, /* 48us or more */
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.t_pdl = 8, /* 8us to 24us */
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.t_pdh = 2, /* 2us to 6us */
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.t_lowr = 1, /* 1us */
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};
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static void
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ow_send_byte(device_t lldev, struct ow_timing *t, uint8_t byte)
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{
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int i;
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for (i = 0; i < 8; i++)
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if (byte & (1 << i))
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OWLL_WRITE_ONE(lldev, t);
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else
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OWLL_WRITE_ZERO(lldev, t);
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}
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static void
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ow_read_byte(device_t lldev, struct ow_timing *t, uint8_t *bytep)
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{
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int i;
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uint8_t byte = 0;
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int bit;
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for (i = 0; i < 8; i++) {
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OWLL_READ_DATA(lldev, t, &bit);
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byte |= bit << i;
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}
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*bytep = byte;
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}
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static int
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ow_send_command(device_t ndev, device_t pdev, struct ow_cmd *cmd)
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{
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int present, i, bit, tries;
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device_t lldev;
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struct ow_timing *t;
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lldev = device_get_parent(ndev);
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/*
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* Retry the reset a couple of times before giving up.
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*/
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tries = 4;
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do {
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OWLL_RESET_AND_PRESENCE(lldev, &timing_regular, &present);
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if (present == 1)
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device_printf(ndev, "Reset said no device on bus?.\n");
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} while (present == 1 && tries-- > 0);
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if (present == 1) {
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device_printf(ndev, "Reset said the device wasn't there.\n");
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return ENOENT; /* No devices acked the RESET */
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}
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if (present == -1) {
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device_printf(ndev, "Reset discovered bus wired wrong.\n");
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return ENOENT;
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}
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for (i = 0; i < cmd->rom_len; i++)
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ow_send_byte(lldev, &timing_regular, cmd->rom_cmd[i]);
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for (i = 0; i < cmd->rom_read_len; i++)
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ow_read_byte(lldev, &timing_regular, cmd->rom_read + i);
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if (cmd->xpt_len) {
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/*
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* Per AN937, the reset pulse and ROM level are always
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* done with the regular timings. Certain ROM commands
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* put the device into overdrive mode for the remainder
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* of the data transfer, which is why we have to pass the
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* timings here. Commands that need to be handled like this
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* are expected to be flagged by the client.
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*/
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t = (cmd->flags & OW_FLAG_OVERDRIVE) ?
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&timing_overdrive : &timing_regular;
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for (i = 0; i < cmd->xpt_len; i++)
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ow_send_byte(lldev, t, cmd->xpt_cmd[i]);
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if (cmd->flags & OW_FLAG_READ_BIT) {
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memset(cmd->xpt_read, 0, (cmd->xpt_read_len + 7) / 8);
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for (i = 0; i < cmd->xpt_read_len; i++) {
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OWLL_READ_DATA(lldev, t, &bit);
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cmd->xpt_read[i / 8] |= bit << (i % 8);
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}
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} else {
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for (i = 0; i < cmd->xpt_read_len; i++)
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ow_read_byte(lldev, t, cmd->xpt_read + i);
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}
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}
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return 0;
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}
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static int
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ow_search_rom(device_t lldev, device_t dev)
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{
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struct ow_cmd cmd;
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memset(&cmd, 0, sizeof(cmd));
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cmd.rom_cmd[0] = SEARCH_ROM;
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cmd.rom_len = 1;
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return ow_send_command(lldev, dev, &cmd);
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}
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#if 0
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static int
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ow_alarm_search(device_t lldev, device_t dev)
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{
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struct ow_cmd cmd;
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memset(&cmd, 0, sizeof(cmd));
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cmd.rom_cmd[0] = ALARM_SEARCH;
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cmd.rom_len = 1;
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return ow_send_command(lldev, dev, &cmd);
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}
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#endif
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static int
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ow_add_child(device_t dev, romid_t romid)
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{
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struct ow_devinfo *di;
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device_t child;
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di = malloc(sizeof(*di), M_OW, M_WAITOK);
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di->romid = romid;
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child = device_add_child(dev, NULL, -1);
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if (child == NULL) {
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free(di, M_OW);
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return ENOMEM;
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}
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device_set_ivars(child, di);
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return (0);
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}
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static device_t
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ow_child_by_romid(device_t dev, romid_t romid)
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{
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device_t *children, retval, child;
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int nkid, i;
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struct ow_devinfo *di;
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if (device_get_children(dev, &children, &nkid) != 0)
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return (NULL);
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retval = NULL;
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for (i = 0; i < nkid; i++) {
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child = children[i];
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di = device_get_ivars(child);
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if (di->romid == romid) {
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retval = child;
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break;
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}
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}
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free(children, M_TEMP);
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return (retval);
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}
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/*
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* CRC generator table -- taken from AN937 DOW CRC LOOKUP FUNCTION Table 2
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*/
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const uint8_t ow_crc_table[] = {
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0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
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157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
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35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
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190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
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70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
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219, 133,103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
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101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
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248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
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140,210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113,147, 205,
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17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80,
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175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82,176, 238,
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50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
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202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
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87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
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233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
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116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
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};
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/*
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* Converted from DO_CRC page 131 ANN937
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*/
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static uint8_t
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ow_crc(device_t ndev, device_t pdev, uint8_t *buffer, size_t len)
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{
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uint8_t crc = 0;
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int i;
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for (i = 0; i < len; i++)
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crc = ow_crc_table[crc ^ buffer[i]];
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return crc;
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}
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static int
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ow_check_crc(romid_t romid)
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{
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return ow_crc(NULL, NULL, (uint8_t *)&romid, sizeof(romid)) == 0;
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}
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static int
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ow_device_found(device_t dev, romid_t romid)
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{
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/* XXX Move this up into enumerate? */
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/*
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* All valid ROM IDs have a valid CRC. Check that first.
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*/
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if (!ow_check_crc(romid)) {
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device_printf(dev, "Device romid %8D failed CRC.\n",
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&romid, ":");
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return EINVAL;
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}
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/*
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* If we've seen this child before, don't add a new one for it.
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*/
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if (ow_child_by_romid(dev, romid) != NULL)
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return 0;
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return ow_add_child(dev, romid);
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}
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static int
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ow_enumerate(device_t dev, ow_enum_fn *enumfp, ow_found_fn *foundfp)
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{
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device_t lldev = device_get_parent(dev);
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int first, second, i, dir, prior, last, err, retries;
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uint64_t probed, last_mask;
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int sanity = 10;
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prior = -1;
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last_mask = 0;
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retries = 0;
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last = -2;
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err = ow_acquire_bus(dev, dev, OWN_DONTWAIT);
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if (err != 0)
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return err;
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while (last != -1) {
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if (sanity-- < 0) {
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printf("Reached the sanity limit\n");
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return EIO;
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}
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again:
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probed = 0;
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last = -1;
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/*
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* See AN397 section 5.II.C.3 for the algorithm (though a bit
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* poorly stated). The search command forces each device to
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* send ROM ID bits one at a time (first the bit, then the
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* complement) the master (us) sends back a bit. If the
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* device's bit doesn't match what we send back, that device
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* stops sending bits back. So each time through we remember
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* where we made the last decision (always 0). If there's a
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* conflict there this time (and there will be in the absence
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* of a hardware failure) we go with 1. This way, we prune the
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* devices on the bus and wind up with a unique ROM. We know
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* we're done when we detect no new conflicts. The same
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* algorithm is used for devices in alarm state as well.
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*
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* In addition, experience has shown that sometimes devices
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* stop responding in the middle of enumeration, so try this
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* step again a few times when that happens. It is unclear if
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* this is due to a nosiy electrical environment or some odd
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* timing issue.
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*/
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/*
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* The enumeration command should be successfully sent, if not,
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* we have big issues on the bus so punt. Lower layers report
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* any unusual errors, so we don't need to here.
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*/
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err = enumfp(dev, dev);
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if (err != 0)
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return (err);
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for (i = 0; i < 64; i++) {
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OWLL_READ_DATA(lldev, &timing_regular, &first);
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OWLL_READ_DATA(lldev, &timing_regular, &second);
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switch (first | second << 1) {
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case 0: /* Conflict */
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if (i < prior)
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dir = (last_mask >> i) & 1;
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else
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dir = i == prior;
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if (dir == 0)
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last = i;
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break;
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case 1: /* 1 then 0 -> 1 for all */
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dir = 1;
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break;
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case 2: /* 0 then 1 -> 0 for all */
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dir = 0;
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break;
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case 3:
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/*
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* No device responded. This is unexpected, but
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* experience has shown that on some platforms
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* we miss a timing window, or otherwise have
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* an issue. Start this step over. Since we've
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* not updated prior yet, we can just jump to
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* the top of the loop for a re-do of this step.
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*/
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printf("oops, starting over\n");
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if (++retries > 5)
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return (EIO);
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goto again;
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default: /* NOTREACHED */
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__unreachable();
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}
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if (dir) {
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OWLL_WRITE_ONE(lldev, &timing_regular);
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probed |= 1ull << i;
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} else {
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OWLL_WRITE_ZERO(lldev, &timing_regular);
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}
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}
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retries = 0;
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foundfp(dev, probed);
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last_mask = probed;
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prior = last;
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}
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ow_release_bus(dev, dev);
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return (0);
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}
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static int
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ow_probe(device_t dev)
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{
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device_set_desc(dev, "1 Wire Bus");
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return (BUS_PROBE_GENERIC);
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}
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static int
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ow_attach(device_t ndev)
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{
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struct ow_softc *sc;
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/*
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* Find all the devices on the bus. We don't probe / attach them in the
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* enumeration phase. We do this because we want to allow the probe /
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* attach routines of the child drivers to have as full an access to the
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* bus as possible. While we reset things before the next step of the
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* search (so it would likely be OK to allow access by the clients to
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* the bus), it is more conservative to find them all, then to do the
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* attach of the devices. This also allows the child devices to have
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* more knowledge of the bus. We also ignore errors from the enumeration
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* because they might happen after we've found a few devices.
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*/
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sc = device_get_softc(ndev);
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sc->dev = ndev;
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mtx_init(&sc->mtx, device_get_nameunit(sc->dev), "ow", MTX_DEF);
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ow_enumerate(ndev, ow_search_rom, ow_device_found);
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return bus_generic_attach(ndev);
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}
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static int
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ow_detach(device_t ndev)
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{
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device_t *children, child;
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int nkid, i;
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struct ow_devinfo *di;
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struct ow_softc *sc;
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sc = device_get_softc(ndev);
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/*
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* detach all the children first. This is blocking until any threads
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* have stopped, etc.
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*/
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bus_generic_detach(ndev);
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/*
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* We delete all the children, and free up the ivars
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*/
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if (device_get_children(ndev, &children, &nkid) != 0)
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return ENOMEM;
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for (i = 0; i < nkid; i++) {
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child = children[i];
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di = device_get_ivars(child);
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free(di, M_OW);
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device_delete_child(ndev, child);
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}
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free(children, M_TEMP);
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OW_LOCK_DESTROY(sc);
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return 0;
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}
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/*
|
|
* Not sure this is really needed. I'm having trouble figuring out what
|
|
* location means in the context of the one wire bus.
|
|
*/
|
|
static int
|
|
ow_child_location_str(device_t dev, device_t child, char *buf,
|
|
size_t buflen)
|
|
{
|
|
|
|
*buf = '\0';
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ow_child_pnpinfo_str(device_t dev, device_t child, char *buf,
|
|
size_t buflen)
|
|
{
|
|
struct ow_devinfo *di;
|
|
|
|
di = device_get_ivars(child);
|
|
snprintf(buf, buflen, "romid=%8D", &di->romid, ":");
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ow_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
|
|
{
|
|
struct ow_devinfo *di;
|
|
romid_t **ptr;
|
|
|
|
di = device_get_ivars(child);
|
|
switch (which) {
|
|
case OW_IVAR_FAMILY:
|
|
*result = di->romid & 0xff;
|
|
break;
|
|
case OW_IVAR_ROMID:
|
|
ptr = (romid_t **)result;
|
|
*ptr = &di->romid;
|
|
break;
|
|
default:
|
|
return EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ow_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
|
|
{
|
|
|
|
return EINVAL;
|
|
}
|
|
|
|
static int
|
|
ow_print_child(device_t ndev, device_t pdev)
|
|
{
|
|
int retval = 0;
|
|
struct ow_devinfo *di;
|
|
|
|
di = device_get_ivars(pdev);
|
|
|
|
retval += bus_print_child_header(ndev, pdev);
|
|
retval += printf(" romid %8D", &di->romid, ":");
|
|
retval += bus_print_child_footer(ndev, pdev);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void
|
|
ow_probe_nomatch(device_t ndev, device_t pdev)
|
|
{
|
|
struct ow_devinfo *di;
|
|
|
|
di = device_get_ivars(pdev);
|
|
device_printf(ndev, "romid %8D: no driver\n", &di->romid, ":");
|
|
}
|
|
|
|
static int
|
|
ow_acquire_bus(device_t ndev, device_t pdev, int how)
|
|
{
|
|
struct ow_softc *sc;
|
|
|
|
sc = device_get_softc(ndev);
|
|
OW_ASSERT_UNLOCKED(sc);
|
|
OW_LOCK(sc);
|
|
if (sc->owner != NULL) {
|
|
if (sc->owner == pdev)
|
|
panic("%s: %s recursively acquiring the bus.\n",
|
|
device_get_nameunit(ndev),
|
|
device_get_nameunit(pdev));
|
|
if (how == OWN_DONTWAIT) {
|
|
OW_UNLOCK(sc);
|
|
return EWOULDBLOCK;
|
|
}
|
|
while (sc->owner != NULL)
|
|
mtx_sleep(sc, &sc->mtx, 0, "owbuswait", 0);
|
|
}
|
|
sc->owner = pdev;
|
|
OW_UNLOCK(sc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
ow_release_bus(device_t ndev, device_t pdev)
|
|
{
|
|
struct ow_softc *sc;
|
|
|
|
sc = device_get_softc(ndev);
|
|
OW_ASSERT_UNLOCKED(sc);
|
|
OW_LOCK(sc);
|
|
if (sc->owner == NULL)
|
|
panic("%s: %s releasing unowned bus.", device_get_nameunit(ndev),
|
|
device_get_nameunit(pdev));
|
|
if (sc->owner != pdev)
|
|
panic("%s: %s don't own the bus. %s does. game over.",
|
|
device_get_nameunit(ndev), device_get_nameunit(pdev),
|
|
device_get_nameunit(sc->owner));
|
|
sc->owner = NULL;
|
|
wakeup(sc);
|
|
OW_UNLOCK(sc);
|
|
}
|
|
|
|
devclass_t ow_devclass;
|
|
|
|
static device_method_t ow_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, ow_probe),
|
|
DEVMETHOD(device_attach, ow_attach),
|
|
DEVMETHOD(device_detach, ow_detach),
|
|
|
|
/* Bus interface */
|
|
DEVMETHOD(bus_child_pnpinfo_str, ow_child_pnpinfo_str),
|
|
DEVMETHOD(bus_child_location_str, ow_child_location_str),
|
|
DEVMETHOD(bus_read_ivar, ow_read_ivar),
|
|
DEVMETHOD(bus_write_ivar, ow_write_ivar),
|
|
DEVMETHOD(bus_print_child, ow_print_child),
|
|
DEVMETHOD(bus_probe_nomatch, ow_probe_nomatch),
|
|
|
|
/* One Wire Network/Transport layer interface */
|
|
DEVMETHOD(own_send_command, ow_send_command),
|
|
DEVMETHOD(own_acquire_bus, ow_acquire_bus),
|
|
DEVMETHOD(own_release_bus, ow_release_bus),
|
|
DEVMETHOD(own_crc, ow_crc),
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t ow_driver = {
|
|
"ow",
|
|
ow_methods,
|
|
sizeof(struct ow_softc),
|
|
};
|
|
|
|
DRIVER_MODULE(ow, owc, ow_driver, ow_devclass, 0, 0);
|
|
MODULE_VERSION(ow, 1);
|