diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-07 18:06:17 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-07 18:06:17 (GMT) |
commit | 38f56f33ca381751f9b8910f67e7a805ec0b68cb (patch) | |
tree | 202f2ce60f3f43a948607ec76c8cc48c1cf73a4b /drivers/dma | |
parent | fcba914542082b272f31c8e4c40000b88ed3208d (diff) | |
parent | 4183bef2e093a2f0aab45f2d5fed82b0e02aeacf (diff) | |
download | linux-38f56f33ca381751f9b8910f67e7a805ec0b68cb.tar.xz |
Merge tag 'dt-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC device tree updates (part 2) from Arnd Bergmann:
"These are mostly new device tree bindings for existing drivers, as
well as changes to the device tree source files to add support for
those devices, and a couple of new boards, most notably Samsung's
Exynos5 based Chromebook.
The changes depend on earlier platform specific updates and touch the
usual platforms: omap, exynos, tegra, mxs, mvebu and davinci."
* tag 'dt-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (169 commits)
ARM: exynos: dts: cros5250: add EC device
ARM: dts: Add sbs-battery for exynos5250-snow
ARM: dts: Add i2c-arbitrator bus for exynos5250-snow
ARM: dts: add mshc controller node for Exynos4x12 SoCs
ARM: dts: Add chip-id controller node on Exynos4/5 SoC
ARM: EXYNOS: Create virtual I/O mapping for Chip-ID controller using device tree
ARM: davinci: da850-evm: add SPI flash support
ARM: davinci: da850: override SPI DT node device name
ARM: davinci: da850: add SPI1 DT node
spi/davinci: add DT binding documentation
spi/davinci: no wildcards in DT compatible property
ARM: dts: mvebu: Convert mvebu device tree files to 64 bits
ARM: dts: mvebu: introduce internal-regs node
ARM: dts: mvebu: Convert all the mvebu files to use the range property
ARM: dts: mvebu: move all peripherals inside soc
ARM: dts: mvebu: fix cpus section indentation
ARM: davinci: da850: add EHRPWM & ECAP DT node
ARM/dts: OMAP3: fix pinctrl-single configuration
ARM: dts: Add OMAP3430 SDP NOR flash memory binding
ARM: dts: Add NOR flash bindings for OMAP2420 H4
...
Diffstat (limited to 'drivers/dma')
-rw-r--r-- | drivers/dma/mxs-dma.c | 109 |
1 files changed, 75 insertions, 34 deletions
diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c index 8f6d30d..b48a79c 100644 --- a/drivers/dma/mxs-dma.c +++ b/drivers/dma/mxs-dma.c @@ -27,6 +27,7 @@ #include <linux/stmp_device.h> #include <linux/of.h> #include <linux/of_device.h> +#include <linux/of_dma.h> #include <asm/irq.h> @@ -139,6 +140,8 @@ struct mxs_dma_engine { struct dma_device dma_device; struct device_dma_parameters dma_parms; struct mxs_dma_chan mxs_chans[MXS_DMA_CHANNELS]; + struct platform_device *pdev; + unsigned int nr_channels; }; struct mxs_dma_type { @@ -350,10 +353,8 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan) struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; int ret; - if (!data) - return -EINVAL; - - mxs_chan->chan_irq = data->chan_irq; + if (data) + mxs_chan->chan_irq = data->chan_irq; mxs_chan->ccw = dma_alloc_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE, &mxs_chan->ccw_phys, @@ -665,8 +666,55 @@ err_out: return ret; } +struct mxs_dma_filter_param { + struct device_node *of_node; + unsigned int chan_id; +}; + +static bool mxs_dma_filter_fn(struct dma_chan *chan, void *fn_param) +{ + struct mxs_dma_filter_param *param = fn_param; + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + int chan_irq; + + if (mxs_dma->dma_device.dev->of_node != param->of_node) + return false; + + if (chan->chan_id != param->chan_id) + return false; + + chan_irq = platform_get_irq(mxs_dma->pdev, param->chan_id); + if (chan_irq < 0) + return false; + + mxs_chan->chan_irq = chan_irq; + + return true; +} + +struct dma_chan *mxs_dma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct mxs_dma_engine *mxs_dma = ofdma->of_dma_data; + dma_cap_mask_t mask = mxs_dma->dma_device.cap_mask; + struct mxs_dma_filter_param param; + + if (dma_spec->args_count != 1) + return NULL; + + param.of_node = ofdma->of_node; + param.chan_id = dma_spec->args[0]; + + if (param.chan_id >= mxs_dma->nr_channels) + return NULL; + + return dma_request_channel(mask, mxs_dma_filter_fn, ¶m); +} + static int __init mxs_dma_probe(struct platform_device *pdev) { + struct device_node *np = pdev->dev.of_node; const struct platform_device_id *id_entry; const struct of_device_id *of_id; const struct mxs_dma_type *dma_type; @@ -674,10 +722,16 @@ static int __init mxs_dma_probe(struct platform_device *pdev) struct resource *iores; int ret, i; - mxs_dma = kzalloc(sizeof(*mxs_dma), GFP_KERNEL); + mxs_dma = devm_kzalloc(&pdev->dev, sizeof(*mxs_dma), GFP_KERNEL); if (!mxs_dma) return -ENOMEM; + ret = of_property_read_u32(np, "dma-channels", &mxs_dma->nr_channels); + if (ret) { + dev_err(&pdev->dev, "failed to read dma-channels\n"); + return ret; + } + of_id = of_match_device(mxs_dma_dt_ids, &pdev->dev); if (of_id) id_entry = of_id->data; @@ -689,24 +743,13 @@ static int __init mxs_dma_probe(struct platform_device *pdev) mxs_dma->dev_id = dma_type->id; iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mxs_dma->base = devm_ioremap_resource(&pdev->dev, iores); + if (IS_ERR(mxs_dma->base)) + return PTR_ERR(mxs_dma->base); - if (!request_mem_region(iores->start, resource_size(iores), - pdev->name)) { - ret = -EBUSY; - goto err_request_region; - } - - mxs_dma->base = ioremap(iores->start, resource_size(iores)); - if (!mxs_dma->base) { - ret = -ENOMEM; - goto err_ioremap; - } - - mxs_dma->clk = clk_get(&pdev->dev, NULL); - if (IS_ERR(mxs_dma->clk)) { - ret = PTR_ERR(mxs_dma->clk); - goto err_clk; - } + mxs_dma->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(mxs_dma->clk)) + return PTR_ERR(mxs_dma->clk); dma_cap_set(DMA_SLAVE, mxs_dma->dma_device.cap_mask); dma_cap_set(DMA_CYCLIC, mxs_dma->dma_device.cap_mask); @@ -732,8 +775,9 @@ static int __init mxs_dma_probe(struct platform_device *pdev) ret = mxs_dma_init(mxs_dma); if (ret) - goto err_init; + return ret; + mxs_dma->pdev = pdev; mxs_dma->dma_device.dev = &pdev->dev; /* mxs_dma gets 65535 bytes maximum sg size */ @@ -751,22 +795,19 @@ static int __init mxs_dma_probe(struct platform_device *pdev) ret = dma_async_device_register(&mxs_dma->dma_device); if (ret) { dev_err(mxs_dma->dma_device.dev, "unable to register\n"); - goto err_init; + return ret; + } + + ret = of_dma_controller_register(np, mxs_dma_xlate, mxs_dma); + if (ret) { + dev_err(mxs_dma->dma_device.dev, + "failed to register controller\n"); + dma_async_device_unregister(&mxs_dma->dma_device); } dev_info(mxs_dma->dma_device.dev, "initialized\n"); return 0; - -err_init: - clk_put(mxs_dma->clk); -err_clk: - iounmap(mxs_dma->base); -err_ioremap: - release_mem_region(iores->start, resource_size(iores)); -err_request_region: - kfree(mxs_dma); - return ret; } static struct platform_driver mxs_dma_driver = { |