32 #include <soc/qcom/tcs.h>
71 /* DRV TCS Configuration Information Register */
77 /* Offsets for CONTROL TCS Registers */
88 /* TCS CMD register bit mask */
102  *   space are all the TCS blocks. The offset of the TCS blocks is
103  *   specified in the device tree by "qcom,tcs-offset" and used to
105  * - TCS blocks come one after another. Type, count, and order are
106  *   specified by the device tree as "qcom,tcs-config".
107  * - Each TCS block has some registers, then space for up to 16 commands.
109  *   might be present. See ncpt (num cmds per TCS).
265 	struct tcs_group *tcs = &drv->tcs[type];  in tcs_invalidate()  local
268 	if (bitmap_empty(tcs->slots, MAX_TCS_SLOTS))  in tcs_invalidate()
271 	for (m = tcs->offset; m < tcs->offset + tcs->num_tcs; m++)  in tcs_invalidate()
274 	bitmap_zero(tcs->slots, MAX_TCS_SLOTS);  in tcs_invalidate()
305 	struct tcs_group *tcs;  in get_tcs_for_msg()  local
323 	 * dedicated TCS for active state use, then re-purpose a wake TCS to  in get_tcs_for_msg()
328 	tcs = &drv->tcs[type];  in get_tcs_for_msg()
329 	if (msg->state == RPMH_ACTIVE_ONLY_STATE && !tcs->num_tcs)  in get_tcs_for_msg()
330 		tcs = &drv->tcs[WAKE_TCS];  in get_tcs_for_msg()
332 	return tcs;  in get_tcs_for_msg()
336  * get_req_from_tcs() - Get a stashed request that was xfering on the given TCS.
338  * @tcs_id: The global ID of this TCS.
354 	struct tcs_group *tcs;  in get_req_from_tcs()  local
358 		tcs = &drv->tcs[i];  in get_req_from_tcs()
359 		if (tcs->mask & BIT(tcs_id))  in get_req_from_tcs()
360 			return tcs->req[tcs_id - tcs->offset];  in get_req_from_tcs()
367  * __tcs_set_trigger() - Start xfer on a TCS or unset trigger on a borrowed TCS
369  * @tcs_id:  The global ID of this TCS.
373  * transfer. That will un-trigger/disable the TCS from the last transfer
376  * If we borrowed a wake TCS for an active-only transfer we'll also call
378  * before using the TCS for wake purposes again.
389 	 * HW req: Clear the DRV_CONTROL and enable TCS again  in __tcs_set_trigger()
400 		/* Enable the AMC mode on the TCS and then trigger the TCS */  in __tcs_set_trigger()
409  * enable_tcs_irq() - Enable or disable interrupts on the given TCS.
411  * @tcs_id:  The global ID of this TCS.
414  * We only ever call this when we borrow a wake TCS for an active-only
457 		 * If wake tcs was re-purposed for sending active  in tcs_tx_done()
459 		 * disable interrupt for this TCS  in tcs_tx_done()
461 		if (!drv->tcs[ACTIVE_TCS].num_tcs)  in tcs_tx_done()
464 		/* Reclaim the TCS */  in tcs_tx_done()
470 		 * Disable interrupt for WAKE TCS to avoid being  in tcs_tx_done()
474 		if (!drv->tcs[ACTIVE_TCS].num_tcs)  in tcs_tx_done()
486  * __tcs_buffer_write() - Write to TCS hardware from a request; don't trigger.
488  * @tcs_id: The global ID of this TCS.
489  * @cmd_id: The index within the TCS to start writing.
491  *          pairs to program (but few enough that they all fit in one TCS).
530  * @tcs: A pointer to the tcs_group used for ACTIVE_ONLY transfers.
532  *       pairs to program (but few enough that they all fit in one TCS).
547 static int check_for_req_inflight(struct rsc_drv *drv, struct tcs_group *tcs,  in check_for_req_inflight()  argument
553 	int i = tcs->offset;  in check_for_req_inflight()
555 	for_each_set_bit_from(i, drv->tcs_in_use, tcs->offset + tcs->num_tcs) {  in check_for_req_inflight()
571  * find_free_tcs() - Find free tcs in the given tcs_group; only for active.
572  * @tcs: A pointer to the active-only tcs_group (or the wake tcs_group if
577  * Return: The first tcs that's free or -EBUSY if all in use.
579 static int find_free_tcs(struct tcs_group *tcs)  in find_free_tcs()  argument
581 	const struct rsc_drv *drv = tcs->drv;  in find_free_tcs()
583 	unsigned long max = tcs->offset + tcs->num_tcs;  in find_free_tcs()
585 	i = find_next_zero_bit(drv->tcs_in_use, max, tcs->offset);  in find_free_tcs()
593  * claim_tcs_for_req() - Claim a tcs in the given tcs_group; only for active.
595  * @tcs: The tcs_group used for ACTIVE_ONLY transfers.
598  * Claims a tcs in the given tcs_group while making sure that no existing cmd
604  * Return: The id of the claimed tcs or -EBUSY if a matching msg is in flight
607 static int claim_tcs_for_req(struct rsc_drv *drv, struct tcs_group *tcs,  in claim_tcs_for_req()  argument
616 	ret = check_for_req_inflight(drv, tcs, msg);  in claim_tcs_for_req()
620 	return find_free_tcs(tcs);  in claim_tcs_for_req()
631  * - To do the transfer, we will grab a whole TCS for ourselves--we don't
647 	struct tcs_group *tcs;  in rpmh_rsc_send_data()  local
652 	tcs = get_tcs_for_msg(drv, msg);  in rpmh_rsc_send_data()
653 	if (IS_ERR(tcs))  in rpmh_rsc_send_data()
654 		return PTR_ERR(tcs);  in rpmh_rsc_send_data()
658 	/* Wait forever for a free tcs. It better be there eventually! */  in rpmh_rsc_send_data()
660 			    (tcs_id = claim_tcs_for_req(drv, tcs, msg)) >= 0,  in rpmh_rsc_send_data()
663 	tcs->req[tcs_id - tcs->offset] = msg;  in rpmh_rsc_send_data()
665 	if (msg->state == RPMH_ACTIVE_ONLY_STATE && tcs->type != ACTIVE_TCS) {  in rpmh_rsc_send_data()
668 		 * repurposed TCS to avoid triggering them. tcs->slots will be  in rpmh_rsc_send_data()
692  * @tcs:    The tcs group to search.
695  *          TCS to write to here.
697  *          the command array of the returned TCS where the client should
701  * tcs->slots for.
705 static int find_slots(struct tcs_group *tcs, const struct tcs_request *msg,  in find_slots()  argument
711 	/* Do over, until we can fit the full payload in a single TCS */  in find_slots()
713 		slot = bitmap_find_next_zero_area(tcs->slots, MAX_TCS_SLOTS,  in find_slots()
715 		if (slot >= tcs->num_tcs * tcs->ncpt)  in find_slots()
717 		i += tcs->ncpt;  in find_slots()
720 	bitmap_set(tcs->slots, slot, msg->num_cmds);  in find_slots()
722 	offset = slot / tcs->ncpt;  in find_slots()
723 	*tcs_id = offset + tcs->offset;  in find_slots()
724 	*cmd_id = slot % tcs->ncpt;  in find_slots()
744 	struct tcs_group *tcs;  in rpmh_rsc_write_ctrl_data()  local
748 	tcs = get_tcs_for_msg(drv, msg);  in rpmh_rsc_write_ctrl_data()
749 	if (IS_ERR(tcs))  in rpmh_rsc_write_ctrl_data()
750 		return PTR_ERR(tcs);  in rpmh_rsc_write_ctrl_data()
752 	/* find the TCS id and the command in the TCS to write to */  in rpmh_rsc_write_ctrl_data()
753 	ret = find_slots(tcs, msg, &tcs_id, &cmd_id);  in rpmh_rsc_write_ctrl_data()
778 	const struct tcs_group *tcs = &drv->tcs[ACTIVE_TCS];  in rpmh_rsc_ctrlr_is_busy()  local
783 	 * dedicated TCS for active state use, then re-purposed wake TCSes  in rpmh_rsc_ctrlr_is_busy()
787 	if (!tcs->num_tcs)  in rpmh_rsc_ctrlr_is_busy()
788 		tcs = &drv->tcs[WAKE_TCS];  in rpmh_rsc_ctrlr_is_busy()
790 	max = tcs->offset + tcs->num_tcs;  in rpmh_rsc_ctrlr_is_busy()
791 	set = find_next_bit(drv->tcs_in_use, max, tcs->offset);  in rpmh_rsc_ctrlr_is_busy()
809 	if (!drv->tcs[CONTROL_TCS].num_tcs || !drv->genpd_nb.notifier_call)  in rpmh_rsc_write_next_wakeup()
972 	struct tcs_group *tcs;  in rpmh_probe_tcs_config()  local
974 	ret = of_property_read_u32(dn, "qcom,tcs-offset", &offset);  in rpmh_probe_tcs_config()
988 	n = of_property_count_u32_elems(dn, "qcom,tcs-config");  in rpmh_probe_tcs_config()
993 		ret = of_property_read_u32_index(dn, "qcom,tcs-config",  in rpmh_probe_tcs_config()
1000 		ret = of_property_read_u32_index(dn, "qcom,tcs-config",  in rpmh_probe_tcs_config()
1009 		tcs = &drv->tcs[tcs_cfg[i].type];  in rpmh_probe_tcs_config()
1010 		if (tcs->drv)  in rpmh_probe_tcs_config()
1012 		tcs->drv = drv;  in rpmh_probe_tcs_config()
1013 		tcs->type = tcs_cfg[i].type;  in rpmh_probe_tcs_config()
1014 		tcs->num_tcs = tcs_cfg[i].n;  in rpmh_probe_tcs_config()
1015 		tcs->ncpt = ncpt;  in rpmh_probe_tcs_config()
1017 		if (!tcs->num_tcs || tcs->type == CONTROL_TCS)  in rpmh_probe_tcs_config()
1020 		if (st + tcs->num_tcs > max_tcs ||  in rpmh_probe_tcs_config()
1021 		    st + tcs->num_tcs >= BITS_PER_BYTE * sizeof(tcs->mask))  in rpmh_probe_tcs_config()
1024 		tcs->mask = ((1 << tcs->num_tcs) - 1) << st;  in rpmh_probe_tcs_config()
1025 		tcs->offset = st;  in rpmh_probe_tcs_config()
1026 		st += tcs->num_tcs;  in rpmh_probe_tcs_config()
1120 	/* Enable the active TCS to send requests immediately */  in rpmh_rsc_probe()
1121 	writel_relaxed(drv->tcs[ACTIVE_TCS].mask,  in rpmh_rsc_probe()