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/*
*
* Copyright (C) 2013 secunet Security Networks AG
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <inttypes.h>
#include <arch/virtual.h>
#include "xhci_private.h"
trb_t *
xhci_next_command_trb(xhci_t *const xhci)
{
xhci_clear_trb(xhci->cr.cur, xhci->cr.pcs);
return xhci->cr.cur;
}
void
xhci_post_command(xhci_t *const xhci)
{
xhci_debug("Command %d (@%p)\n",
TRB_GET(TT, xhci->cr.cur), xhci->cr.cur);
TRB_SET(C, xhci->cr.cur, xhci->cr.pcs);
++xhci->cr.cur;
/* pass command trb to hardware */
wmb();
/* Ring the doorbell */
xhci->dbreg[0] = 0;
while (TRB_GET(TT, xhci->cr.cur) == TRB_LINK) {
xhci_debug("Handling LINK pointer (@%p)\n", xhci->cr.cur);
const int tc = TRB_GET(TC, xhci->cr.cur);
TRB_SET(C, xhci->cr.cur, xhci->cr.pcs);
xhci->cr.cur = phys_to_virt(xhci->cr.cur->ptr_low);
if (tc)
xhci->cr.pcs ^= 1;
}
}
static int
xhci_wait_for_command(xhci_t *const xhci,
const trb_t *const cmd_trb,
const int clear_event)
{
int cc;
cc = xhci_wait_for_command_done(xhci, cmd_trb, clear_event);
if (cc != TIMEOUT)
return cc;
/* Abort command on timeout */
xhci_debug("Aborting command (@%p), CRCR: 0x%"PRIx32"\n",
cmd_trb, xhci->opreg->crcr_lo);
/*
* Ref. xHCI Specification Revision 1.2, May 2019.
* Section 5.4.5, Table 5-24.
*
* Abort the command and stop the ring.
*/
xhci->opreg->crcr_lo |= CRCR_CA;
xhci->opreg->crcr_hi = 0;
cc = xhci_wait_for_command_aborted(xhci, cmd_trb);
if (xhci->opreg->crcr_lo & CRCR_CRR)
fatal("xhci_wait_for_command: Command ring still running\n");
return cc;
}
/*
* xhci_cmd_* return >= 0: xhci completion code (cc)
* < 0: driver error code
*/
int
xhci_cmd_enable_slot(xhci_t *const xhci, int *const slot_id)
{
trb_t *const cmd = xhci_next_command_trb(xhci);
TRB_SET(TT, cmd, TRB_CMD_ENABLE_SLOT);
xhci_post_command(xhci);
int cc = xhci_wait_for_command(xhci, cmd, 0);
if (cc >= 0) {
if (cc == CC_SUCCESS) {
*slot_id = TRB_GET(ID, xhci->er.cur);
if (*slot_id > xhci->max_slots_en)
cc = CONTROLLER_ERROR;
}
xhci_advance_event_ring(xhci);
xhci_handle_events(xhci);
}
return cc;
}
int
xhci_cmd_disable_slot(xhci_t *const xhci, const int slot_id)
{
trb_t *const cmd = xhci_next_command_trb(xhci);
TRB_SET(TT, cmd, TRB_CMD_DISABLE_SLOT);
TRB_SET(ID, cmd, slot_id);
xhci_post_command(xhci);
return xhci_wait_for_command(xhci, cmd, 1);
}
int
xhci_cmd_address_device(xhci_t *const xhci,
const int slot_id,
inputctx_t *const ic)
{
trb_t *const cmd = xhci_next_command_trb(xhci);
TRB_SET(TT, cmd, TRB_CMD_ADDRESS_DEV);
TRB_SET(ID, cmd, slot_id);
cmd->ptr_low = virt_to_phys(ic->raw);
xhci_post_command(xhci);
return xhci_wait_for_command(xhci, cmd, 1);
}
int
xhci_cmd_configure_endpoint(xhci_t *const xhci,
const int slot_id,
const int config_id,
inputctx_t *const ic)
{
trb_t *const cmd = xhci_next_command_trb(xhci);
TRB_SET(TT, cmd, TRB_CMD_CONFIGURE_EP);
TRB_SET(ID, cmd, slot_id);
cmd->ptr_low = virt_to_phys(ic->raw);
if (config_id == 0)
TRB_SET(DC, cmd, 1);
xhci_post_command(xhci);
return xhci_wait_for_command(xhci, cmd, 1);
}
int
xhci_cmd_evaluate_context(xhci_t *const xhci,
const int slot_id,
inputctx_t *const ic)
{
trb_t *const cmd = xhci_next_command_trb(xhci);
TRB_SET(TT, cmd, TRB_CMD_EVAL_CTX);
TRB_SET(ID, cmd, slot_id);
cmd->ptr_low = virt_to_phys(ic->raw);
xhci_post_command(xhci);
return xhci_wait_for_command(xhci, cmd, 1);
}
int
xhci_cmd_reset_endpoint(xhci_t *const xhci, const int slot_id, const int ep)
{
trb_t *const cmd = xhci_next_command_trb(xhci);
TRB_SET(TT, cmd, TRB_CMD_RESET_EP);
TRB_SET(ID, cmd, slot_id);
TRB_SET(EP, cmd, ep);
xhci_post_command(xhci);
return xhci_wait_for_command(xhci, cmd, 1);
}
int
xhci_cmd_stop_endpoint(xhci_t *const xhci, const int slot_id, const int ep)
{
trb_t *const cmd = xhci_next_command_trb(xhci);
TRB_SET(TT, cmd, TRB_CMD_STOP_EP);
TRB_SET(ID, cmd, slot_id);
TRB_SET(EP, cmd, ep);
xhci_post_command(xhci);
return xhci_wait_for_command(xhci, cmd, 1);
}
int
xhci_cmd_set_tr_dq(xhci_t *const xhci, const int slot_id, const int ep,
trb_t *const dq_trb, const int dcs)
{
trb_t *const cmd = xhci_next_command_trb(xhci);
TRB_SET(TT, cmd, TRB_CMD_SET_TR_DQ);
TRB_SET(ID, cmd, slot_id);
TRB_SET(EP, cmd, ep);
cmd->ptr_low = virt_to_phys(dq_trb) | dcs;
xhci_post_command(xhci);
return xhci_wait_for_command(xhci, cmd, 1);
}
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