diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-27 14:11:43 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-27 14:11:43 -0700 |
commit | 7ae0ae4a022b72f33d23ab6e858163d4b37400a5 (patch) | |
tree | 9524aef624dc4aaf1874c660fcd6d7a38b6cc615 /drivers/spi/spi-pxa2xx-dma.c | |
parent | 607e11ab6654e167b1b0ec132cedc73e220f63c6 (diff) | |
parent | dec34e8b676e14d4df041e3335d6082b247b834e (diff) |
Merge tag 'spi-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi updates from Mark Brown:
"Quite a lot of cleanup and maintainence work going on this release in
various drivers, and also a fix for a nasty locking issue in the core:
- A fix for locking issues when external drivers explicitly locked
the bus with spi_bus_lock() - we were using the same lock to both
control access to the physical bus in multi-threaded I/O operations
and exclude multiple callers.
Confusion between these two caused us to have scenarios where we
were dropping locks. These are fixed by splitting into two
separate locks like should have been done originally, making
everything much clearer and correct.
- Support for DMA in spi_flash_read().
- Support for instantiating spidev on ACPI systems, including some
test devices used in Windows validation.
- Use of the core DMA mapping functionality in the McSPI driver.
- Start of support for ThunderX SPI controllers, involving a very big
set of changes to the Cavium driver.
- Support for Braswell, Exynos 5433, Kaby Lake, Merrifield, RK3036,
RK3228, RK3368 controllers"
* tag 'spi-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (64 commits)
spi: Split bus and I/O locking
spi: octeon: Split driver into Octeon specific and common parts
spi: octeon: Move include file from arch/mips to drivers/spi
spi: octeon: Put register offsets into a struct
spi: octeon: Store system clock freqency in struct octeon_spi
spi: octeon: Convert driver to use readq()/writeq() functions
spi: pic32-sqi: fixup wait_for_completion_timeout return handling
spi: pic32: fixup wait_for_completion_timeout return handling
spi: rockchip: limit transfers to (64K - 1) bytes
spi: xilinx: Return IRQ_NONE if no interrupts were detected
spi: xilinx: Handle errors from platform_get_irq()
spi: s3c64xx: restore removed comments
spi: s3c64xx: add Exynos5433 compatible for ioclk handling
spi: s3c64xx: use error code from clk_prepare_enable()
spi: s3c64xx: rename goto labels to meaningful names
spi: s3c64xx: document the clocks and the clock-name property
spi: s3c64xx: add exynos5433 spi compatible
spi: s3c64xx: fix reference leak to master in s3c64xx_spi_remove()
spi: spi-sh: Remove deprecated create_singlethread_workqueue
spi: spi-topcliff-pch: Remove deprecated create_singlethread_workqueue
...
Diffstat (limited to 'drivers/spi/spi-pxa2xx-dma.c')
-rw-r--r-- | drivers/spi/spi-pxa2xx-dma.c | 170 |
1 files changed, 29 insertions, 141 deletions
diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c index a18a03d0afb7..db3ae1dd829e 100644 --- a/drivers/spi/spi-pxa2xx-dma.c +++ b/drivers/spi/spi-pxa2xx-dma.c @@ -20,79 +20,6 @@ #include "spi-pxa2xx.h" -static int pxa2xx_spi_map_dma_buffer(struct driver_data *drv_data, - enum dma_data_direction dir) -{ - int i, nents, len = drv_data->len; - struct scatterlist *sg; - struct device *dmadev; - struct sg_table *sgt; - void *buf, *pbuf; - - if (dir == DMA_TO_DEVICE) { - dmadev = drv_data->tx_chan->device->dev; - sgt = &drv_data->tx_sgt; - buf = drv_data->tx; - } else { - dmadev = drv_data->rx_chan->device->dev; - sgt = &drv_data->rx_sgt; - buf = drv_data->rx; - } - - nents = DIV_ROUND_UP(len, SZ_2K); - if (nents != sgt->nents) { - int ret; - - sg_free_table(sgt); - ret = sg_alloc_table(sgt, nents, GFP_ATOMIC); - if (ret) - return ret; - } - - pbuf = buf; - for_each_sg(sgt->sgl, sg, sgt->nents, i) { - size_t bytes = min_t(size_t, len, SZ_2K); - - sg_set_buf(sg, pbuf, bytes); - pbuf += bytes; - len -= bytes; - } - - nents = dma_map_sg(dmadev, sgt->sgl, sgt->nents, dir); - if (!nents) - return -ENOMEM; - - return nents; -} - -static void pxa2xx_spi_unmap_dma_buffer(struct driver_data *drv_data, - enum dma_data_direction dir) -{ - struct device *dmadev; - struct sg_table *sgt; - - if (dir == DMA_TO_DEVICE) { - dmadev = drv_data->tx_chan->device->dev; - sgt = &drv_data->tx_sgt; - } else { - dmadev = drv_data->rx_chan->device->dev; - sgt = &drv_data->rx_sgt; - } - - dma_unmap_sg(dmadev, sgt->sgl, sgt->nents, dir); -} - -static void pxa2xx_spi_unmap_dma_buffers(struct driver_data *drv_data) -{ - if (!drv_data->dma_mapped) - return; - - pxa2xx_spi_unmap_dma_buffer(drv_data, DMA_FROM_DEVICE); - pxa2xx_spi_unmap_dma_buffer(drv_data, DMA_TO_DEVICE); - - drv_data->dma_mapped = 0; -} - static void pxa2xx_spi_dma_transfer_complete(struct driver_data *drv_data, bool error) { @@ -125,8 +52,6 @@ static void pxa2xx_spi_dma_transfer_complete(struct driver_data *drv_data, pxa2xx_spi_write(drv_data, SSTO, 0); if (!error) { - pxa2xx_spi_unmap_dma_buffers(drv_data); - msg->actual_length += drv_data->len; msg->state = pxa2xx_spi_next_transfer(drv_data); } else { @@ -152,11 +77,12 @@ pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data, enum dma_transfer_direction dir) { struct chip_data *chip = drv_data->cur_chip; + struct spi_transfer *xfer = drv_data->cur_transfer; enum dma_slave_buswidth width; struct dma_slave_config cfg; struct dma_chan *chan; struct sg_table *sgt; - int nents, ret; + int ret; switch (drv_data->n_bytes) { case 1: @@ -178,17 +104,15 @@ pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data, cfg.dst_addr_width = width; cfg.dst_maxburst = chip->dma_burst_size; - sgt = &drv_data->tx_sgt; - nents = drv_data->tx_nents; - chan = drv_data->tx_chan; + sgt = &xfer->tx_sg; + chan = drv_data->master->dma_tx; } else { cfg.src_addr = drv_data->ssdr_physical; cfg.src_addr_width = width; cfg.src_maxburst = chip->dma_burst_size; - sgt = &drv_data->rx_sgt; - nents = drv_data->rx_nents; - chan = drv_data->rx_chan; + sgt = &xfer->rx_sg; + chan = drv_data->master->dma_rx; } ret = dmaengine_slave_config(chan, &cfg); @@ -197,46 +121,10 @@ pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data, return NULL; } - return dmaengine_prep_slave_sg(chan, sgt->sgl, nents, dir, + return dmaengine_prep_slave_sg(chan, sgt->sgl, sgt->nents, dir, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); } -bool pxa2xx_spi_dma_is_possible(size_t len) -{ - return len <= MAX_DMA_LEN; -} - -int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data) -{ - const struct chip_data *chip = drv_data->cur_chip; - int ret; - - if (!chip->enable_dma) - return 0; - - /* Don't bother with DMA if we can't do even a single burst */ - if (drv_data->len < chip->dma_burst_size) - return 0; - - ret = pxa2xx_spi_map_dma_buffer(drv_data, DMA_TO_DEVICE); - if (ret <= 0) { - dev_warn(&drv_data->pdev->dev, "failed to DMA map TX\n"); - return 0; - } - - drv_data->tx_nents = ret; - - ret = pxa2xx_spi_map_dma_buffer(drv_data, DMA_FROM_DEVICE); - if (ret <= 0) { - pxa2xx_spi_unmap_dma_buffer(drv_data, DMA_TO_DEVICE); - dev_warn(&drv_data->pdev->dev, "failed to DMA map RX\n"); - return 0; - } - - drv_data->rx_nents = ret; - return 1; -} - irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data) { u32 status; @@ -245,8 +133,8 @@ irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data) if (status & SSSR_ROR) { dev_err(&drv_data->pdev->dev, "FIFO overrun\n"); - dmaengine_terminate_async(drv_data->rx_chan); - dmaengine_terminate_async(drv_data->tx_chan); + dmaengine_terminate_async(drv_data->master->dma_rx); + dmaengine_terminate_async(drv_data->master->dma_tx); pxa2xx_spi_dma_transfer_complete(drv_data, true); return IRQ_HANDLED; @@ -285,16 +173,15 @@ int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst) return 0; err_rx: - dmaengine_terminate_async(drv_data->tx_chan); + dmaengine_terminate_async(drv_data->master->dma_tx); err_tx: - pxa2xx_spi_unmap_dma_buffers(drv_data); return err; } void pxa2xx_spi_dma_start(struct driver_data *drv_data) { - dma_async_issue_pending(drv_data->rx_chan); - dma_async_issue_pending(drv_data->tx_chan); + dma_async_issue_pending(drv_data->master->dma_rx); + dma_async_issue_pending(drv_data->master->dma_tx); atomic_set(&drv_data->dma_running, 1); } @@ -303,21 +190,22 @@ int pxa2xx_spi_dma_setup(struct driver_data *drv_data) { struct pxa2xx_spi_master *pdata = drv_data->master_info; struct device *dev = &drv_data->pdev->dev; + struct spi_master *master = drv_data->master; dma_cap_mask_t mask; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); - drv_data->tx_chan = dma_request_slave_channel_compat(mask, + master->dma_tx = dma_request_slave_channel_compat(mask, pdata->dma_filter, pdata->tx_param, dev, "tx"); - if (!drv_data->tx_chan) + if (!master->dma_tx) return -ENODEV; - drv_data->rx_chan = dma_request_slave_channel_compat(mask, + master->dma_rx = dma_request_slave_channel_compat(mask, pdata->dma_filter, pdata->rx_param, dev, "rx"); - if (!drv_data->rx_chan) { - dma_release_channel(drv_data->tx_chan); - drv_data->tx_chan = NULL; + if (!master->dma_rx) { + dma_release_channel(master->dma_tx); + master->dma_tx = NULL; return -ENODEV; } @@ -326,17 +214,17 @@ int pxa2xx_spi_dma_setup(struct driver_data *drv_data) void pxa2xx_spi_dma_release(struct driver_data *drv_data) { - if (drv_data->rx_chan) { - dmaengine_terminate_sync(drv_data->rx_chan); - dma_release_channel(drv_data->rx_chan); - sg_free_table(&drv_data->rx_sgt); - drv_data->rx_chan = NULL; + struct spi_master *master = drv_data->master; + + if (master->dma_rx) { + dmaengine_terminate_sync(master->dma_rx); + dma_release_channel(master->dma_rx); + master->dma_rx = NULL; } - if (drv_data->tx_chan) { - dmaengine_terminate_sync(drv_data->tx_chan); - dma_release_channel(drv_data->tx_chan); - sg_free_table(&drv_data->tx_sgt); - drv_data->tx_chan = NULL; + if (master->dma_tx) { + dmaengine_terminate_sync(master->dma_tx); + dma_release_channel(master->dma_tx); + master->dma_tx = NULL; } } |