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Commit 0d81e947 authored by Lina Iyer's avatar Lina Iyer
Browse files

drivers: mailbox: tcs: Support mbox controller ->is_idle() 



Allow clients to query the controller status. The controller is
considered idle, if the TCS mailboxes are all idle.

Change-Id: Icd5ffd1b1160cd88f069694d2929aa5b10199348
Signed-off-by: default avatarLina Iyer <ilina@codeaurora.org>
parent 88a8fdae

drivers/mailbox/qti-tcs.c

+24 −0
Original line number Diff line number Diff line
@@ -485,6 +485,29 @@ static void __tcs_buffer_write(void __iomem *base, int d, int m, int n, 
	}

}



/**

 * tcs_drv_is_idle: Check if any of the AMCs are busy.

 *

 * @mbox: The mailbox controller.

 *

 * Returns true if the AMCs are not engaged or absent.

 */

static bool tcs_drv_is_idle(struct mbox_controller *mbox)

{

	int m;

	struct tcs_drv *drv = container_of(mbox, struct tcs_drv, mbox);

	struct tcs_mbox *tcs = get_tcs_of_type(drv, ACTIVE_TCS);



	if (IS_ERR(tcs))

		return true;



	for (m = tcs->tcs_offset; m < tcs->tcs_offset + tcs->num_tcs; m++)

		if (!tcs_is_free(drv->reg_base, m))

			return false;



	return true;

}



static void wait_for_req_inflight(struct tcs_drv *drv, struct tcs_mbox *tcs,

						struct tcs_mbox_msg *msg)

{
@@ -997,6 +1020,7 @@ static int tcs_drv_probe(struct platform_device *pdev) 
	drv->mbox.num_chans = num_chans;

	drv->mbox.txdone_irq = true;

	drv->mbox.of_xlate = of_tcs_mbox_xlate;

	drv->mbox.is_idle = tcs_drv_is_idle;

	drv->num_tcs = st;

	drv->pdev = pdev;

include/linux/mailbox_controller.h

+1 −1
Original line number Diff line number Diff line
@@ -74,7 +74,7 @@ struct mbox_chan_ops { 
 * @txpoll_period:	If 'txdone_poll' is in effect, the API polls for

 *			last TX's status after these many millisecs

 * @of_xlate:		Controller driver specific mapping of channel via DT

 * @is_idle:		Is the controller idle?

 * @is_idle:		Return if the controller is idle.

 * @poll_hrt:		API private. hrtimer used to poll for TXDONE on all

 *			channels.

 * @node:		API private. To hook into list of controllers.