diff options
Diffstat (limited to 'drivers/mailbox/ti-msgmgr.c')
| -rw-r--r-- | drivers/mailbox/ti-msgmgr.c | 93 |
1 files changed, 91 insertions, 2 deletions
diff --git a/drivers/mailbox/ti-msgmgr.c b/drivers/mailbox/ti-msgmgr.c index f860cd0c907a..ddac423ac1a9 100644 --- a/drivers/mailbox/ti-msgmgr.c +++ b/drivers/mailbox/ti-msgmgr.c @@ -2,7 +2,7 @@ /* * Texas Instruments' Message Manager Driver * - * Copyright (C) 2015-2017 Texas Instruments Incorporated - https://www.ti.com/ + * Copyright (C) 2015-2022 Texas Instruments Incorporated - https://www.ti.com/ * Nishanth Menon */ @@ -11,6 +11,7 @@ #include <linux/device.h> #include <linux/interrupt.h> #include <linux/io.h> +#include <linux/iopoll.h> #include <linux/kernel.h> #include <linux/mailbox_controller.h> #include <linux/module.h> @@ -100,6 +101,7 @@ struct ti_msgmgr_desc { * @queue_ctrl: Queue Control register * @chan: Mailbox channel * @rx_buff: Receive buffer pointer allocated at probe, max_message_size + * @polled_rx_mode: Use polling for rx instead of interrupts */ struct ti_queue_inst { char name[30]; @@ -113,6 +115,7 @@ struct ti_queue_inst { void __iomem *queue_ctrl; struct mbox_chan *chan; u32 *rx_buff; + bool polled_rx_mode; }; /** @@ -237,6 +240,26 @@ static int ti_msgmgr_queue_rx_data(struct mbox_chan *chan, struct ti_queue_inst return 0; } +static int ti_msgmgr_queue_rx_poll_timeout(struct mbox_chan *chan, int timeout_us) +{ + struct device *dev = chan->mbox->dev; + struct ti_msgmgr_inst *inst = dev_get_drvdata(dev); + struct ti_queue_inst *qinst = chan->con_priv; + const struct ti_msgmgr_desc *desc = inst->desc; + int msg_count; + int ret; + + ret = readl_poll_timeout_atomic(qinst->queue_state, msg_count, + (msg_count & desc->status_cnt_mask), + 10, timeout_us); + if (ret != 0) + return ret; + + ti_msgmgr_queue_rx_data(chan, qinst, desc); + + return 0; +} + /** * ti_msgmgr_queue_rx_interrupt() - Interrupt handler for receive Queue * @irq: Interrupt number @@ -346,6 +369,17 @@ static bool ti_msgmgr_last_tx_done(struct mbox_chan *chan) return msg_count ? false : true; } +static bool ti_msgmgr_chan_has_polled_queue_rx(struct mbox_chan *chan) +{ + struct ti_queue_inst *qinst; + + if (!chan) + return false; + + qinst = chan->con_priv; + return qinst->polled_rx_mode; +} + /** * ti_msgmgr_send_data() - Send data * @chan: Channel Pointer @@ -363,6 +397,7 @@ static int ti_msgmgr_send_data(struct mbox_chan *chan, void *data) struct ti_msgmgr_message *message = data; void __iomem *data_reg; u32 *word_data; + int ret = 0; if (WARN_ON(!inst)) { dev_err(dev, "no platform drv data??\n"); @@ -404,7 +439,12 @@ static int ti_msgmgr_send_data(struct mbox_chan *chan, void *data) if (data_reg <= qinst->queue_buff_end) writel(0, qinst->queue_buff_end); - return 0; + /* If we are in polled mode, wait for a response before proceeding */ + if (ti_msgmgr_chan_has_polled_queue_rx(message->chan_rx)) + ret = ti_msgmgr_queue_rx_poll_timeout(message->chan_rx, + message->timeout_rx_ms * 1000); + + return ret; } /** @@ -652,6 +692,54 @@ static int ti_msgmgr_queue_setup(int idx, struct device *dev, return 0; } +static int ti_msgmgr_queue_rx_set_polled_mode(struct ti_queue_inst *qinst, bool enable) +{ + if (enable) { + disable_irq(qinst->irq); + qinst->polled_rx_mode = true; + } else { + enable_irq(qinst->irq); + qinst->polled_rx_mode = false; + } + + return 0; +} + +static int ti_msgmgr_suspend(struct device *dev) +{ + struct ti_msgmgr_inst *inst = dev_get_drvdata(dev); + struct ti_queue_inst *qinst; + int i; + + /* + * We must switch operation to polled mode now as drivers and the genpd + * layer may make late TI SCI calls to change clock and device states + * from the noirq phase of suspend. + */ + for (qinst = inst->qinsts, i = 0; i < inst->num_valid_queues; qinst++, i++) { + if (!qinst->is_tx) + ti_msgmgr_queue_rx_set_polled_mode(qinst, true); + } + + return 0; +} + +static int ti_msgmgr_resume(struct device *dev) +{ + struct ti_msgmgr_inst *inst = dev_get_drvdata(dev); + struct ti_queue_inst *qinst; + int i; + + for (qinst = inst->qinsts, i = 0; i < inst->num_valid_queues; qinst++, i++) { + if (!qinst->is_tx) + ti_msgmgr_queue_rx_set_polled_mode(qinst, false); + } + + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(ti_msgmgr_pm_ops, ti_msgmgr_suspend, ti_msgmgr_resume); + /* Queue operations */ static const struct mbox_chan_ops ti_msgmgr_chan_ops = { .startup = ti_msgmgr_queue_startup, @@ -839,6 +927,7 @@ static struct platform_driver ti_msgmgr_driver = { .driver = { .name = "ti-msgmgr", .of_match_table = of_match_ptr(ti_msgmgr_of_match), + .pm = &ti_msgmgr_pm_ops, }, }; module_platform_driver(ti_msgmgr_driver); |