data, tcs_id, reg);
}
-/**
- * tcs_invalidate() - Invalidate all TCSes of the given type (sleep or wake).
- * @drv: The RSC controller.
- * @type: SLEEP_TCS or WAKE_TCS
- *
- * This will clear the "slots" variable of the given tcs_group and also
- * tell the hardware to forget about all entries.
- *
- * The caller must ensure that no other RPMH actions are happening when this
- * function is called, since otherwise the device may immediately become
- * used again even before this function exits.
- */
-static void tcs_invalidate(struct rsc_drv *drv, int type)
-{
- int m;
- struct tcs_group *tcs = &drv->tcs[type];
-
- /* Caller ensures nobody else is running so no lock */
- if (bitmap_empty(tcs->slots, MAX_TCS_SLOTS))
- return;
-
- for (m = tcs->offset; m < tcs->offset + tcs->num_tcs; m++)
- write_tcs_reg_sync(drv, drv->regs[RSC_DRV_CMD_ENABLE], m, 0);
-
- bitmap_zero(tcs->slots, MAX_TCS_SLOTS);
-}
-
-/**
- * rpmh_rsc_invalidate() - Invalidate sleep and wake TCSes.
- * @drv: The RSC controller.
- *
- * The caller must ensure that no other RPMH actions are happening when this
- * function is called, since otherwise the device may immediately become
- * used again even before this function exits.
- */
-void rpmh_rsc_invalidate(struct rsc_drv *drv)
-{
- tcs_invalidate(drv, SLEEP_TCS);
- tcs_invalidate(drv, WAKE_TCS);
-}
-
/**
* get_tcs_for_msg() - Get the tcs_group used to send the given message.
* @drv: The RSC controller.
return tcs;
}
-/**
- * get_req_from_tcs() - Get a stashed request that was xfering on the given TCS.
- * @drv: The RSC controller.
- * @tcs_id: The global ID of this TCS.
- *
- * For ACTIVE_ONLY transfers we want to call back into the client when the
- * transfer finishes. To do this we need the "request" that the client
- * originally provided us. This function grabs the request that we stashed
- * when we started the transfer.
- *
- * This only makes sense for ACTIVE_ONLY transfers since those are the only
- * ones we track sending (the only ones we enable interrupts for and the only
- * ones we call back to the client for).
- *
- * Return: The stashed request.
- */
-static const struct tcs_request *get_req_from_tcs(struct rsc_drv *drv,
- int tcs_id)
-{
- struct tcs_group *tcs;
- int i;
-
- for (i = 0; i < TCS_TYPE_NR; i++) {
- tcs = &drv->tcs[i];
- if (tcs->mask & BIT(tcs_id))
- return tcs->req[tcs_id - tcs->offset];
- }
-
- return NULL;
-}
-
-/**
- * __tcs_set_trigger() - Start xfer on a TCS or unset trigger on a borrowed TCS
- * @drv: The controller.
- * @tcs_id: The global ID of this TCS.
- * @trigger: If true then untrigger/retrigger. If false then just untrigger.
- *
- * In the normal case we only ever call with "trigger=true" to start a
- * transfer. That will un-trigger/disable the TCS from the last transfer
- * then trigger/enable for this transfer.
- *
- * If we borrowed a wake TCS for an active-only transfer we'll also call
- * this function with "trigger=false" to just do the un-trigger/disable
- * before using the TCS for wake purposes again.
- *
- * Note that the AP is only in charge of triggering active-only transfers.
- * The AP never triggers sleep/wake values using this function.
- */
-static void __tcs_set_trigger(struct rsc_drv *drv, int tcs_id, bool trigger)
-{
- u32 enable;
- u32 reg = drv->regs[RSC_DRV_CONTROL];
-
- /*
- * HW req: Clear the DRV_CONTROL and enable TCS again
- * While clearing ensure that the AMC mode trigger is cleared
- * and then the mode enable is cleared.
- */
- enable = read_tcs_reg(drv, reg, tcs_id);
- enable &= ~TCS_AMC_MODE_TRIGGER;
- write_tcs_reg_sync(drv, reg, tcs_id, enable);
- enable &= ~TCS_AMC_MODE_ENABLE;
- write_tcs_reg_sync(drv, reg, tcs_id, enable);
-
- if (trigger) {
- /* Enable the AMC mode on the TCS and then trigger the TCS */
- enable = TCS_AMC_MODE_ENABLE;
- write_tcs_reg_sync(drv, reg, tcs_id, enable);
- enable |= TCS_AMC_MODE_TRIGGER;
- write_tcs_reg(drv, reg, tcs_id, enable);
- }
-}
-
-/**
- * enable_tcs_irq() - Enable or disable interrupts on the given TCS.
- * @drv: The controller.
- * @tcs_id: The global ID of this TCS.
- * @enable: If true then enable; if false then disable
- *
- * We only ever call this when we borrow a wake TCS for an active-only
- * transfer. For active-only TCSes interrupts are always left enabled.
- */
-static void enable_tcs_irq(struct rsc_drv *drv, int tcs_id, bool enable)
-{
- u32 data;
- u32 reg = drv->regs[RSC_DRV_IRQ_ENABLE];
-
- data = readl_relaxed(drv->tcs_base + reg);
- if (enable)
- data |= BIT(tcs_id);
- else
- data &= ~BIT(tcs_id);
- writel_relaxed(data, drv->tcs_base + reg);
-}
-
-/**
- * tcs_tx_done() - TX Done interrupt handler.
- * @irq: The IRQ number (ignored).
- * @p: Pointer to "struct rsc_drv".
- *
- * Called for ACTIVE_ONLY transfers (those are the only ones we enable the
- * IRQ for) when a transfer is done.
- *
- * Return: IRQ_HANDLED
- */
-static irqreturn_t tcs_tx_done(int irq, void *p)
-{
- struct rsc_drv *drv = p;
- int i;
- unsigned long irq_status;
- const struct tcs_request *req;
-
- irq_status = readl_relaxed(drv->tcs_base + drv->regs[RSC_DRV_IRQ_STATUS]);
-
- for_each_set_bit(i, &irq_status, BITS_PER_TYPE(u32)) {
- req = get_req_from_tcs(drv, i);
- if (WARN_ON(!req))
- goto skip;
-
- trace_rpmh_tx_done(drv, i, req);
-
- /*
- * If wake tcs was re-purposed for sending active
- * votes, clear AMC trigger & enable modes and
- * disable interrupt for this TCS
- */
- if (!drv->tcs[ACTIVE_TCS].num_tcs)
- __tcs_set_trigger(drv, i, false);
-skip:
- /* Reclaim the TCS */
- write_tcs_reg(drv, drv->regs[RSC_DRV_CMD_ENABLE], i, 0);
- writel_relaxed(BIT(i), drv->tcs_base + drv->regs[RSC_DRV_IRQ_CLEAR]);
- spin_lock(&drv->lock);
- clear_bit(i, drv->tcs_in_use);
- /*
- * Disable interrupt for WAKE TCS to avoid being
- * spammed with interrupts coming when the solver
- * sends its wake votes.
- */
- if (!drv->tcs[ACTIVE_TCS].num_tcs)
- enable_tcs_irq(drv, i, false);
- spin_unlock(&drv->lock);
- wake_up(&drv->tcs_wait);
- if (req)
- rpmh_tx_done(req);
- }
-
- return IRQ_HANDLED;
-}
-
/**
* __tcs_buffer_write() - Write to TCS hardware from a request; don't trigger.
* @drv: The controller.
write_tcs_reg(drv, drv->regs[RSC_DRV_CMD_ENABLE], tcs_id, cmd_enable);
}
-/**
- * check_for_req_inflight() - Look to see if conflicting cmds are in flight.
- * @drv: The controller.
- * @tcs: A pointer to the tcs_group used for ACTIVE_ONLY transfers.
- * @msg: The message we want to send, which will contain several addr/data
- * pairs to program (but few enough that they all fit in one TCS).
- *
- * This will walk through the TCSes in the group and check if any of them
- * appear to be sending to addresses referenced in the message. If it finds
- * one it'll return -EBUSY.
- *
- * Only for use for active-only transfers.
- *
- * Must be called with the drv->lock held since that protects tcs_in_use.
- *
- * Return: 0 if nothing in flight or -EBUSY if we should try again later.
- * The caller must re-enable interrupts between tries since that's
- * the only way tcs_in_use will ever be updated and the only way
- * RSC_DRV_CMD_ENABLE will ever be cleared.
- */
-static int check_for_req_inflight(struct rsc_drv *drv, struct tcs_group *tcs,
- const struct tcs_request *msg)
-{
- unsigned long curr_enabled;
- u32 addr;
- int j, k;
- int i = tcs->offset;
-
- for_each_set_bit_from(i, drv->tcs_in_use, tcs->offset + tcs->num_tcs) {
- curr_enabled = read_tcs_reg(drv, drv->regs[RSC_DRV_CMD_ENABLE], i);
-
- for_each_set_bit(j, &curr_enabled, MAX_CMDS_PER_TCS) {
- addr = read_tcs_cmd(drv, drv->regs[RSC_DRV_CMD_ADDR], i, j);
- for (k = 0; k < msg->num_cmds; k++) {
- if (cmd_db_match_resource_addr(msg->cmds[k].addr, addr))
- return -EBUSY;
- }
- }
- }
-
- return 0;
-}
-
-/**
- * find_free_tcs() - Find free tcs in the given tcs_group; only for active.
- * @tcs: A pointer to the active-only tcs_group (or the wake tcs_group if
- * we borrowed it because there are zero active-only ones).
- *
- * Must be called with the drv->lock held since that protects tcs_in_use.
- *
- * Return: The first tcs that's free or -EBUSY if all in use.
- */
-static int find_free_tcs(struct tcs_group *tcs)
-{
- const struct rsc_drv *drv = tcs->drv;
- unsigned long i;
- unsigned long max = tcs->offset + tcs->num_tcs;
-
- i = find_next_zero_bit(drv->tcs_in_use, max, tcs->offset);
- if (i >= max)
- return -EBUSY;
-
- return i;
-}
-
-/**
- * claim_tcs_for_req() - Claim a tcs in the given tcs_group; only for active.
- * @drv: The controller.
- * @tcs: The tcs_group used for ACTIVE_ONLY transfers.
- * @msg: The data to be sent.
- *
- * Claims a tcs in the given tcs_group while making sure that no existing cmd
- * is in flight that would conflict with the one in @msg.
- *
- * Context: Must be called with the drv->lock held since that protects
- * tcs_in_use.
- *
- * Return: The id of the claimed tcs or -EBUSY if a matching msg is in flight
- * or the tcs_group is full.
- */
-static int claim_tcs_for_req(struct rsc_drv *drv, struct tcs_group *tcs,
- const struct tcs_request *msg)
-{
- int ret;
-
- /*
- * The h/w does not like if we send a request to the same address,
- * when one is already in-flight or being processed.
- */
- ret = check_for_req_inflight(drv, tcs, msg);
- if (ret)
- return ret;
-
- return find_free_tcs(tcs);
-}
-
/**
* rpmh_rsc_send_data() - Write / trigger active-only message.
* @drv: The controller.
* cleaned from rpmh_flush() by invoking rpmh_rsc_invalidate()
*/
write_tcs_reg_sync(drv, drv->regs[RSC_DRV_CMD_ENABLE], tcs_id, 0);
- enable_tcs_irq(drv, tcs_id, true);
}
spin_unlock_irq(&drv->lock);
* of __tcs_set_trigger() below.
*/
__tcs_buffer_write(drv, tcs_id, 0, msg);
- __tcs_set_trigger(drv, tcs_id, true);
-
- return 0;
-}
-
-/**
- * find_slots() - Find a place to write the given message.
- * @tcs: The tcs group to search.
- * @msg: The message we want to find room for.
- * @tcs_id: If we return 0 from the function, we return the global ID of the
- * TCS to write to here.
- * @cmd_id: If we return 0 from the function, we return the index of
- * the command array of the returned TCS where the client should
- * start writing the message.
- *
- * Only for use on sleep/wake TCSes since those are the only ones we maintain
- * tcs->slots for.
- *
- * Return: -ENOMEM if there was no room, else 0.
- */
-static int find_slots(struct tcs_group *tcs, const struct tcs_request *msg,
- int *tcs_id, int *cmd_id)
-{
- int slot, offset;
- int i = 0;
-
- /* Do over, until we can fit the full payload in a single TCS */
- do {
- slot = bitmap_find_next_zero_area(tcs->slots, MAX_TCS_SLOTS,
- i, msg->num_cmds, 0);
- if (slot >= tcs->num_tcs * tcs->ncpt)
- return -ENOMEM;
- i += tcs->ncpt;
- } while (slot + msg->num_cmds - 1 >= i);
-
- bitmap_set(tcs->slots, slot, msg->num_cmds);
-
- offset = slot / tcs->ncpt;
- *tcs_id = offset + tcs->offset;
- *cmd_id = slot % tcs->ncpt;
return 0;
}
-/**
- * rpmh_rsc_write_ctrl_data() - Write request to controller but don't trigger.
- * @drv: The controller.
- * @msg: The data to be written to the controller.
- *
- * This should only be called for sleep/wake state, never active-only
- * state.
- *
- * The caller must ensure that no other RPMH actions are happening and the
- * controller is idle when this function is called since it runs lockless.
- *
- * Return: 0 if no error; else -error.
- */
-int rpmh_rsc_write_ctrl_data(struct rsc_drv *drv, const struct tcs_request *msg)
-{
- struct tcs_group *tcs;
- int tcs_id = 0, cmd_id = 0;
- int ret;
-
- tcs = get_tcs_for_msg(drv, msg);
- if (IS_ERR(tcs))
- return PTR_ERR(tcs);
-
- /* find the TCS id and the command in the TCS to write to */
- ret = find_slots(tcs, msg, &tcs_id, &cmd_id);
- if (!ret)
- __tcs_buffer_write(drv, tcs_id, cmd_id, msg);
-
- return ret;
-}
-
-/**
- * rpmh_rsc_ctrlr_is_busy() - Check if any of the AMCs are busy.
- * @drv: The controller
- *
- * Checks if any of the AMCs are busy in handling ACTIVE sets.
- * This is called from the last cpu powering down before flushing
- * SLEEP and WAKE sets. If AMCs are busy, controller can not enter
- * power collapse, so deny from the last cpu's pm notification.
- *
- * Context: Must be called with the drv->lock held.
- *
- * Return:
- * * False - AMCs are idle
- * * True - AMCs are busy
- */
-static bool rpmh_rsc_ctrlr_is_busy(struct rsc_drv *drv)
-{
- unsigned long set;
- const struct tcs_group *tcs = &drv->tcs[ACTIVE_TCS];
- unsigned long max;
-
- /*
- * If we made an active request on a RSC that does not have a
- * dedicated TCS for active state use, then re-purposed wake TCSes
- * should be checked for not busy, because we used wake TCSes for
- * active requests in this case.
- */
- if (!tcs->num_tcs)
- tcs = &drv->tcs[WAKE_TCS];
-
- max = tcs->offset + tcs->num_tcs;
- set = find_next_bit(drv->tcs_in_use, max, tcs->offset);
-
- return set < max;
-}
-
-/**
- * rpmh_rsc_write_next_wakeup() - Write next wakeup in CONTROL_TCS.
- * @drv: The controller
- *
- * Writes maximum wakeup cycles when called from suspend.
- * Writes earliest hrtimer wakeup when called from idle.
- */
-void rpmh_rsc_write_next_wakeup(struct rsc_drv *drv)
-{
- ktime_t now, wakeup;
- u64 wakeup_us, wakeup_cycles = ~0;
- u32 lo, hi;
-
- if (!drv->tcs[CONTROL_TCS].num_tcs || !drv->genpd_nb.notifier_call)
- return;
-
- /* Set highest time when system (timekeeping) is suspended */
- if (system_state == SYSTEM_SUSPEND)
- goto exit;
-
- /* Find the earliest hrtimer wakeup from online cpus */
- wakeup = dev_pm_genpd_get_next_hrtimer(drv->dev);
-
- /* Find the relative wakeup in kernel time scale */
- now = ktime_get();
- wakeup = ktime_sub(wakeup, now);
- wakeup_us = ktime_to_us(wakeup);
-
- /* Convert the wakeup to arch timer scale */
- wakeup_cycles = USECS_TO_CYCLES(wakeup_us);
- wakeup_cycles += arch_timer_read_counter();
-
-exit:
- lo = wakeup_cycles & RSC_DRV_CTL_TCS_DATA_LO_MASK;
- hi = wakeup_cycles >> RSC_DRV_CTL_TCS_DATA_SIZE;
- hi &= RSC_DRV_CTL_TCS_DATA_HI_MASK;
- hi |= RSC_DRV_CTL_TCS_DATA_HI_VALID;
-
- writel_relaxed(lo, drv->base + RSC_DRV_CTL_TCS_DATA_LO);
- writel_relaxed(hi, drv->base + RSC_DRV_CTL_TCS_DATA_HI);
-}
-
-/**
- * rpmh_rsc_cpu_pm_callback() - Check if any of the AMCs are busy.
- * @nfb: Pointer to the notifier block in struct rsc_drv.
- * @action: CPU_PM_ENTER, CPU_PM_ENTER_FAILED, or CPU_PM_EXIT.
- * @v: Unused
- *
- * This function is given to cpu_pm_register_notifier so we can be informed
- * about when CPUs go down. When all CPUs go down we know no more active
- * transfers will be started so we write sleep/wake sets. This function gets
- * called from cpuidle code paths and also at system suspend time.
- *
- * If its last CPU going down and AMCs are not busy then writes cached sleep
- * and wake messages to TCSes. The firmware then takes care of triggering
- * them when entering deepest low power modes.
- *
- * Return: See cpu_pm_register_notifier()
- */
-static int rpmh_rsc_cpu_pm_callback(struct notifier_block *nfb,
- unsigned long action, void *v)
-{
- struct rsc_drv *drv = container_of(nfb, struct rsc_drv, rsc_pm);
- int ret = NOTIFY_OK;
- int cpus_in_pm;
-
- switch (action) {
- case CPU_PM_ENTER:
- cpus_in_pm = atomic_inc_return(&drv->cpus_in_pm);
- /*
- * NOTE: comments for num_online_cpus() point out that it's
- * only a snapshot so we need to be careful. It should be OK
- * for us to use, though. It's important for us not to miss
- * if we're the last CPU going down so it would only be a
- * problem if a CPU went offline right after we did the check
- * AND that CPU was not idle AND that CPU was the last non-idle
- * CPU. That can't happen. CPUs would have to come out of idle
- * before the CPU could go offline.
- */
- if (cpus_in_pm < num_online_cpus())
- return NOTIFY_OK;
- break;
- case CPU_PM_ENTER_FAILED:
- case CPU_PM_EXIT:
- atomic_dec(&drv->cpus_in_pm);
- return NOTIFY_OK;
- default:
- return NOTIFY_DONE;
- }
-
- /*
- * It's likely we're on the last CPU. Grab the drv->lock and write
- * out the sleep/wake commands to RPMH hardware. Grabbing the lock
- * means that if we race with another CPU coming up we are still
- * guaranteed to be safe. If another CPU came up just after we checked
- * and has grabbed the lock or started an active transfer then we'll
- * notice we're busy and abort. If another CPU comes up after we start
- * flushing it will be blocked from starting an active transfer until
- * we're done flushing. If another CPU starts an active transfer after
- * we release the lock we're still OK because we're no longer the last
- * CPU.
- */
- if (spin_trylock(&drv->lock)) {
- if (rpmh_rsc_ctrlr_is_busy(drv) || rpmh_flush(&drv->client))
- ret = NOTIFY_BAD;
- spin_unlock(&drv->lock);
- } else {
- /* Another CPU must be up */
- return NOTIFY_OK;
- }
-
- if (ret == NOTIFY_BAD) {
- /* Double-check if we're here because someone else is up */
- if (cpus_in_pm < num_online_cpus())
- ret = NOTIFY_OK;
- else
- /* We won't be called w/ CPU_PM_ENTER_FAILED */
- atomic_dec(&drv->cpus_in_pm);
- }
-
- return ret;
-}
-
-/**
- * rpmh_rsc_pd_callback() - Check if any of the AMCs are busy.
- * @nfb: Pointer to the genpd notifier block in struct rsc_drv.
- * @action: GENPD_NOTIFY_PRE_OFF, GENPD_NOTIFY_OFF, GENPD_NOTIFY_PRE_ON or GENPD_NOTIFY_ON.
- * @v: Unused
- *
- * This function is given to dev_pm_genpd_add_notifier() so we can be informed
- * about when cluster-pd is going down. When cluster go down we know no more active
- * transfers will be started so we write sleep/wake sets. This function gets
- * called from cpuidle code paths and also at system suspend time.
- *
- * If AMCs are not busy then writes cached sleep and wake messages to TCSes.
- * The firmware then takes care of triggering them when entering deepest low power modes.
- *
- * Return:
- * * NOTIFY_OK - success
- * * NOTIFY_BAD - failure
- */
-static int rpmh_rsc_pd_callback(struct notifier_block *nfb,
- unsigned long action, void *v)
-{
- struct rsc_drv *drv = container_of(nfb, struct rsc_drv, genpd_nb);
-
- /* We don't need to lock as genpd on/off are serialized */
- if ((action == GENPD_NOTIFY_PRE_OFF) &&
- (rpmh_rsc_ctrlr_is_busy(drv) || rpmh_flush(&drv->client)))
- return NOTIFY_BAD;
-
- return NOTIFY_OK;
-}
-
-static int rpmh_rsc_pd_attach(struct rsc_drv *drv, struct device *dev)
-{
- int ret;
-
- pm_runtime_enable(dev);
- drv->genpd_nb.notifier_call = rpmh_rsc_pd_callback;
- ret = dev_pm_genpd_add_notifier(dev, &drv->genpd_nb);
- if (ret)
- pm_runtime_disable(dev);
-
- return ret;
-}
-
static int rpmh_probe_tcs_config(struct platform_device *pdev, struct rsc_drv *drv)
{
struct tcs_type_config {
projects / u-boot.git / commitdiff