projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 67eacc15 GL |
1 | /* |
| 2 | * SHDMA Device Tree glue | |
| 3 | * | |
| 4 | * Copyright (C) 2013 Renesas Electronics Inc. | |
| 5 | * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de> | |
| 6 | * | |
| 7 | * This is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of version 2 of the GNU General Public License as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/dmaengine.h> | |
| 13 | #include <linux/module.h> | |
| 14 | #include <linux/of.h> | |
| 15 | #include <linux/of_dma.h> | |
| 16 | #include <linux/of_platform.h> | |
| 17 | #include <linux/platform_device.h> | |
| 18 | #include <linux/shdma-base.h> | |
| 19 | ||
| 20 | #define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan) | |
| 21 | ||
| 22 | static struct dma_chan *shdma_of_xlate(struct of_phandle_args *dma_spec, | |
| 23 | struct of_dma *ofdma) | |
| 24 | { | |
| 25 | u32 id = dma_spec->args[0]; | |
| 26 | dma_cap_mask_t mask; | |
| 27 | struct dma_chan *chan; | |
| 28 | ||
| 29 | if (dma_spec->args_count != 1) | |
| 30 | return NULL; | |
| 31 | ||
| 32 | dma_cap_zero(mask); | |
| 33 | /* Only slave DMA channels can be allocated via DT */ | |
| 34 | dma_cap_set(DMA_SLAVE, mask); | |
| 35 | ||
| 42e4a12a LP |
36 | chan = dma_request_channel(mask, shdma_chan_filter, |
| 37 | (void *)(uintptr_t)id); | |
| 67eacc15 GL |
38 | if (chan) |
| 39 | to_shdma_chan(chan)->hw_req = id; | |
| 40 | ||
| 41 | return chan; | |
| 42 | } | |
| 43 | ||
| 44 | static int shdma_of_probe(struct platform_device *pdev) | |
| 45 | { | |
| d4adcc01 | 46 | const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev); |
| 67eacc15 GL |
47 | int ret; |
| 48 | ||
| 67eacc15 GL |
49 | ret = of_dma_controller_register(pdev->dev.of_node, |
| 50 | shdma_of_xlate, pdev); | |
| 51 | if (ret < 0) | |
| 52 | return ret; | |
| 53 | ||
| 54 | ret = of_platform_populate(pdev->dev.of_node, NULL, lookup, &pdev->dev); | |
| 55 | if (ret < 0) | |
| 56 | of_dma_controller_free(pdev->dev.of_node); | |
| 57 | ||
| 58 | return ret; | |
| 59 | } | |
| 60 | ||
| 61 | static const struct of_device_id shdma_of_match[] = { | |
| 62 | { .compatible = "renesas,shdma-mux", }, | |
| 63 | { } | |
| 64 | }; | |
| 65 | MODULE_DEVICE_TABLE(of, sh_dmae_of_match); | |
| 66 | ||
| 67 | static struct platform_driver shdma_of = { | |
| 68 | .driver = { | |
| 67eacc15 GL |
69 | .name = "shdma-of", |
| 70 | .of_match_table = shdma_of_match, | |
| 71 | }, | |
| 72 | .probe = shdma_of_probe, | |
| 73 | }; | |
| 74 | ||
| 75 | module_platform_driver(shdma_of); | |
| 76 | ||
| 77 | MODULE_LICENSE("GPL v2"); | |
| 78 | MODULE_DESCRIPTION("SH-DMA driver DT glue"); | |
| 79 | MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); |