diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index cd30390..9dfd502 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -48,13 +48,13 @@ config DW_DMAC can be integrated in chips such as the Atmel AT32ap7000. config FSL_DMA - bool "Freescale MPC85xx/MPC83xx DMA support" - depends on PPC + tristate "Freescale Elo and Elo Plus DMA support" + depends on PPC_83xx || PPC_85xx || PPC_86xx select DMA_ENGINE ---help--- - Enable support for the Freescale DMA engine. Now, it support - MPC8560/40, MPC8555, MPC8548 and MPC8641 processors. - The MPC8349, MPC8360 is also supported. + Enable support for the Freescale Elo and Elo Plus DMA controllers. + The Elo is the DMA controller on 83xx parts, and the Elo Plus is + the DMA controller on 85xx and 86xx parts. config MV_XOR bool "Marvell XOR engine support" diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c index c0059ca..327c485 100644 --- a/drivers/dma/fsldma.c +++ b/drivers/dma/fsldma.c @@ -372,6 +372,10 @@ static int fsl_dma_alloc_chan_resources(struct dma_chan *chan, struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan); LIST_HEAD(tmp_list); + /* Has this channel already been allocated? */ + if (fsl_chan->desc_pool) + return 1; + /* We need the descriptor to be aligned to 32bytes * for meeting FSL DMA specification requirement. */ @@ -381,7 +385,7 @@ static int fsl_dma_alloc_chan_resources(struct dma_chan *chan, if (!fsl_chan->desc_pool) { dev_err(fsl_chan->dev, "No memory for channel %d " "descriptor dma pool.\n", fsl_chan->id); - return 0; + return -ENOMEM; } return 1; @@ -410,6 +414,8 @@ static void fsl_dma_free_chan_resources(struct dma_chan *chan) } spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); dma_pool_destroy(fsl_chan->desc_pool); + + fsl_chan->desc_pool = NULL; } static struct dma_async_tx_descriptor * @@ -912,33 +918,37 @@ out: return err; } -static int __devinit of_fsl_dma_chan_probe(struct of_device *dev, - const struct of_device_id *match) +static int __devinit fsl_dma_chan_probe(struct fsl_dma_device *fdev, + struct device_node *node, u32 feature, const char *compatible) { - struct fsl_dma_device *fdev; struct fsl_dma_chan *new_fsl_chan; + const u32 *iprop; int err; - fdev = dev_get_drvdata(dev->dev.parent); - BUG_ON(!fdev); - /* alloc channel */ new_fsl_chan = kzalloc(sizeof(struct fsl_dma_chan), GFP_KERNEL); if (!new_fsl_chan) { - dev_err(&dev->dev, "No free memory for allocating " + dev_err(fdev->dev, "No free memory for allocating " "dma channels!\n"); return -ENOMEM; } + new_fsl_chan->of_dev = of_platform_device_create(node, NULL, fdev->dev); + if (!new_fsl_chan->of_dev) { + dev_err(fdev->dev, "cannot create platform device\n"); + err = -EINVAL; + goto err_no_dev; + } + /* get dma channel register base */ - err = of_address_to_resource(dev->node, 0, &new_fsl_chan->reg); + err = of_address_to_resource(node, 0, &new_fsl_chan->reg); if (err) { - dev_err(&dev->dev, "Can't get %s property 'reg'\n", - dev->node->full_name); + dev_err(fdev->dev, "Can't get %s property 'reg'\n", + node->full_name); goto err_no_reg; } - new_fsl_chan->feature = *(u32 *)match->data; + new_fsl_chan->feature = feature; if (!fdev->feature) fdev->feature = new_fsl_chan->feature; @@ -948,17 +958,22 @@ static int __devinit of_fsl_dma_chan_probe(struct of_device *dev, */ WARN_ON(fdev->feature != new_fsl_chan->feature); - new_fsl_chan->dev = &dev->dev; + new_fsl_chan->dev = &new_fsl_chan->of_dev->dev; new_fsl_chan->reg_base = ioremap(new_fsl_chan->reg.start, new_fsl_chan->reg.end - new_fsl_chan->reg.start + 1); - new_fsl_chan->id = ((new_fsl_chan->reg.start - 0x100) & 0xfff) >> 7; - if (new_fsl_chan->id > FSL_DMA_MAX_CHANS_PER_DEVICE) { - dev_err(&dev->dev, "There is no %d channel!\n", - new_fsl_chan->id); + iprop = of_get_property(node, "cell-index", NULL); + if (!iprop) { + dev_err(fdev->dev, "missing cell-index property\n"); + return -EINVAL; + } + if (*iprop >= FSL_DMA_MAX_CHANS_PER_DEVICE) { + dev_err(fdev->dev, "invalid cell-index value %u\n", *iprop); err = -EINVAL; goto err_no_chan; } + new_fsl_chan->id = *iprop; + fdev->chan[new_fsl_chan->id] = new_fsl_chan; tasklet_init(&new_fsl_chan->tasklet, dma_do_tasklet, (unsigned long)new_fsl_chan); @@ -988,14 +1003,14 @@ static int __devinit of_fsl_dma_chan_probe(struct of_device *dev, &fdev->common.channels); fdev->common.chancnt++; - new_fsl_chan->irq = irq_of_parse_and_map(dev->node, 0); + new_fsl_chan->irq = irq_of_parse_and_map(node, 0); if (new_fsl_chan->irq != NO_IRQ) { err = request_irq(new_fsl_chan->irq, &fsl_dma_chan_do_interrupt, IRQF_SHARED, "fsldma-channel", new_fsl_chan); if (err) { - dev_err(&dev->dev, "DMA channel %s request_irq error " - "with return %d\n", dev->node->full_name, err); + dev_err(fdev->dev, "DMA channel %s request_irq error " + "with return %d\n", node->full_name, err); goto err_no_irq; } } @@ -1004,8 +1019,8 @@ static int __devinit of_fsl_dma_chan_probe(struct of_device *dev, if (err) goto err_self_test; - dev_info(&dev->dev, "#%d (%s), irq %d\n", new_fsl_chan->id, - match->compatible, new_fsl_chan->irq); + dev_info(fdev->dev, "#%d (%s), irq %d\n", new_fsl_chan->id, + compatible, new_fsl_chan->irq); return 0; @@ -1016,42 +1031,30 @@ err_no_irq: err_no_chan: iounmap(new_fsl_chan->reg_base); err_no_reg: + of_device_unregister(new_fsl_chan->of_dev); +err_no_dev: kfree(new_fsl_chan); return err; } -const u32 mpc8540_dma_ip_feature = FSL_DMA_IP_85XX | FSL_DMA_BIG_ENDIAN; -const u32 mpc8349_dma_ip_feature = FSL_DMA_IP_83XX | FSL_DMA_LITTLE_ENDIAN; - -static struct of_device_id of_fsl_dma_chan_ids[] = { - { - .compatible = "fsl,eloplus-dma-channel", - .data = (void *)&mpc8540_dma_ip_feature, - }, - { - .compatible = "fsl,elo-dma-channel", - .data = (void *)&mpc8349_dma_ip_feature, - }, - {} -}; - -static struct of_platform_driver of_fsl_dma_chan_driver = { - .name = "of-fsl-dma-channel", - .match_table = of_fsl_dma_chan_ids, - .probe = of_fsl_dma_chan_probe, -}; - -static __init int of_fsl_dma_chan_init(void) +static void fsl_dma_chan_remove(struct fsl_dma_chan *fchan) { - return of_register_platform_driver(&of_fsl_dma_chan_driver); + if (fchan) { + of_device_unregister(fchan->of_dev); + + free_irq(fchan->irq, fchan); + list_del(&fchan->common.device_node); + iounmap(fchan->reg_base); + kfree(fchan); + } } static int __devinit of_fsl_dma_probe(struct of_device *dev, const struct of_device_id *match) { int err; - unsigned int irq; struct fsl_dma_device *fdev; + struct device_node *child; fdev = kzalloc(sizeof(struct fsl_dma_device), GFP_KERNEL); if (!fdev) { @@ -1085,9 +1088,9 @@ static int __devinit of_fsl_dma_probe(struct of_device *dev, fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending; fdev->common.dev = &dev->dev; - irq = irq_of_parse_and_map(dev->node, 0); - if (irq != NO_IRQ) { - err = request_irq(irq, &fsl_dma_do_interrupt, IRQF_SHARED, + fdev->irq = irq_of_parse_and_map(dev->node, 0); + if (fdev->irq != NO_IRQ) { + err = request_irq(fdev->irq, &fsl_dma_do_interrupt, IRQF_SHARED, "fsldma-device", fdev); if (err) { dev_err(&dev->dev, "DMA device request_irq error " @@ -1097,7 +1100,21 @@ static int __devinit of_fsl_dma_probe(struct of_device *dev, } dev_set_drvdata(&(dev->dev), fdev); - of_platform_bus_probe(dev->node, of_fsl_dma_chan_ids, &dev->dev); + + /* We cannot use of_platform_bus_probe() because there is no + * of_platform_bus_remove. We have to manually instantiate every DMA + * channel object. + */ + for_each_child_of_node(dev->node, child) { + if (of_device_is_compatible(child, "fsl,eloplus-dma-channel")) + fsl_dma_chan_probe(fdev, child, + FSL_DMA_IP_85XX | FSL_DMA_BIG_ENDIAN, + "fsl,eloplus-dma-channel"); + if (of_device_is_compatible(child, "fsl,elo-dma-channel")) + fsl_dma_chan_probe(fdev, child, + FSL_DMA_IP_83XX | FSL_DMA_LITTLE_ENDIAN, + "fsl,elo-dma-channel"); + } dma_async_device_register(&fdev->common); return 0; @@ -1109,6 +1126,31 @@ err_no_reg: return err; } +static int of_fsl_dma_remove(struct of_device *of_dev) +{ + struct fsl_dma_device *fdev; + unsigned int i; + + fdev = dev_get_drvdata(&of_dev->dev); + + dma_async_device_unregister(&fdev->common); + + for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) { + fsl_dma_chan_remove(fdev->chan[i]); + fdev->chan[i] = NULL; + } + + if (fdev->irq != NO_IRQ) + free_irq(fdev->irq, fdev); + + iounmap(fdev->reg_base); + + kfree(fdev); + dev_set_drvdata(&of_dev->dev, NULL); + + return 0; +} + static struct of_device_id of_fsl_dma_ids[] = { { .compatible = "fsl,eloplus-dma", }, { .compatible = "fsl,elo-dma", }, @@ -1116,15 +1158,32 @@ static struct of_device_id of_fsl_dma_ids[] = { }; static struct of_platform_driver of_fsl_dma_driver = { - .name = "of-fsl-dma", + .name = "fsl-elo-dma", .match_table = of_fsl_dma_ids, .probe = of_fsl_dma_probe, + .remove = of_fsl_dma_remove, }; static __init int of_fsl_dma_init(void) { - return of_register_platform_driver(&of_fsl_dma_driver); + int ret; + + pr_info("Freescale Elo / Elo Plus DMA driver\n"); + + ret = of_register_platform_driver(&of_fsl_dma_driver); + if (ret) + pr_err("fsldma: failed to register platform driver\n"); + + return ret; +} + +static void __exit of_fsl_dma_exit(void) +{ + of_unregister_platform_driver(&of_fsl_dma_driver); } -subsys_initcall(of_fsl_dma_chan_init); subsys_initcall(of_fsl_dma_init); +module_exit(of_fsl_dma_exit); + +MODULE_DESCRIPTION("Freescale Elo / Elo Plus DMA driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h index 6faf07b..e0902dd 100644 --- a/drivers/dma/fsldma.h +++ b/drivers/dma/fsldma.h @@ -114,6 +114,7 @@ struct fsl_dma_device { struct dma_device common; struct fsl_dma_chan *chan[FSL_DMA_MAX_CHANS_PER_DEVICE]; u32 feature; /* The same as DMA channels */ + int irq; /* Channel IRQ */ }; /* Define macros for fsl_dma_chan->feature property */ @@ -135,6 +136,7 @@ struct fsl_dma_chan { struct dma_chan common; /* DMA common channel */ struct dma_pool *desc_pool; /* Descriptors pool */ struct device *dev; /* Channel device */ + struct of_device *of_dev; /* OF device */ struct resource reg; /* Resource for register */ int irq; /* Channel IRQ */ int id; /* Raw id of this channel */