diff options
Diffstat (limited to 'drivers/spi/spi-qup.c')
| -rw-r--r-- | drivers/spi/spi-qup.c | 65 |
1 files changed, 46 insertions, 19 deletions
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c index 974a8ce58b68..2f559e531100 100644 --- a/drivers/spi/spi-qup.c +++ b/drivers/spi/spi-qup.c @@ -1,14 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2008-2014, The Linux foundation. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License rev 2 and - * only rev 2 as published by the free Software foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or fITNESS fOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. */ #include <linux/clk.h> @@ -281,6 +273,9 @@ static void spi_qup_read(struct spi_qup *controller, u32 *opflags) writel_relaxed(QUP_OP_IN_SERVICE_FLAG, controller->base + QUP_OPERATIONAL); + if (!remainder) + goto exit; + if (is_block_mode) { num_words = (remainder > words_per_block) ? words_per_block : remainder; @@ -310,11 +305,13 @@ static void spi_qup_read(struct spi_qup *controller, u32 *opflags) * to refresh opflags value because MAX_INPUT_DONE_FLAG may now be * present and this is used to determine if transaction is complete */ - *opflags = readl_relaxed(controller->base + QUP_OPERATIONAL); - if (is_block_mode && *opflags & QUP_OP_MAX_INPUT_DONE_FLAG) - writel_relaxed(QUP_OP_IN_SERVICE_FLAG, - controller->base + QUP_OPERATIONAL); - +exit: + if (!remainder) { + *opflags = readl_relaxed(controller->base + QUP_OPERATIONAL); + if (is_block_mode && *opflags & QUP_OP_MAX_INPUT_DONE_FLAG) + writel_relaxed(QUP_OP_IN_SERVICE_FLAG, + controller->base + QUP_OPERATIONAL); + } } static void spi_qup_write_to_fifo(struct spi_qup *controller, u32 num_words) @@ -362,6 +359,10 @@ static void spi_qup_write(struct spi_qup *controller) writel_relaxed(QUP_OP_OUT_SERVICE_FLAG, controller->base + QUP_OPERATIONAL); + /* make sure the interrupt is valid */ + if (!remainder) + return; + if (is_block_mode) { num_words = (remainder > words_per_block) ? words_per_block : remainder; @@ -575,10 +576,24 @@ static int spi_qup_do_pio(struct spi_device *spi, struct spi_transfer *xfer, return 0; } +static bool spi_qup_data_pending(struct spi_qup *controller) +{ + unsigned int remainder_tx, remainder_rx; + + remainder_tx = DIV_ROUND_UP(spi_qup_len(controller) - + controller->tx_bytes, controller->w_size); + + remainder_rx = DIV_ROUND_UP(spi_qup_len(controller) - + controller->rx_bytes, controller->w_size); + + return remainder_tx || remainder_rx; +} + static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id) { struct spi_qup *controller = dev_id; u32 opflags, qup_err, spi_err; + unsigned long flags; int error = 0; qup_err = readl_relaxed(controller->base + QUP_ERROR_FLAGS); @@ -610,6 +625,11 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id) error = -EIO; } + spin_lock_irqsave(&controller->lock, flags); + if (!controller->error) + controller->error = error; + spin_unlock_irqrestore(&controller->lock, flags); + if (spi_qup_is_dma_xfer(controller->mode)) { writel_relaxed(opflags, controller->base + QUP_OPERATIONAL); } else { @@ -618,10 +638,21 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id) if (opflags & QUP_OP_OUT_SERVICE_FLAG) spi_qup_write(controller); + + if (!spi_qup_data_pending(controller)) + complete(&controller->done); } - if ((opflags & QUP_OP_MAX_INPUT_DONE_FLAG) || error) + if (error) + complete(&controller->done); + + if (opflags & QUP_OP_MAX_INPUT_DONE_FLAG) { + if (!spi_qup_is_dma_xfer(controller->mode)) { + if (spi_qup_data_pending(controller)) + return IRQ_HANDLED; + } complete(&controller->done); + } return IRQ_HANDLED; } @@ -842,10 +873,6 @@ static int spi_qup_transfer_one(struct spi_master *master, else ret = spi_qup_do_pio(spi, xfer, timeout); - if (ret) - goto exit; - -exit: spi_qup_set_state(controller, QUP_STATE_RESET); spin_lock_irqsave(&controller->lock, flags); if (!ret) |