diff options
| -rw-r--r-- | arch/arm/mach-omap2/omap_device.c | 84 |
1 files changed, 51 insertions, 33 deletions
diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c index 8917a0881206..e065daa537c0 100644 --- a/arch/arm/mach-omap2/omap_device.c +++ b/arch/arm/mach-omap2/omap_device.c @@ -559,55 +559,73 @@ struct omap_device *omap_device_alloc(struct platform_device *pdev, od->hwmods = hwmods; od->pdev = pdev; - /* Count all resources for the device */ - res_count = omap_device_count_resources(od, IORESOURCE_IRQ | - IORESOURCE_DMA | - IORESOURCE_MEM); /* + * Non-DT Boot: + * Here, pdev->num_resources = 0, and we should get all the + * resources from hwmod. + * * DT Boot: * OF framework will construct the resource structure (currently * does for MEM & IRQ resource) and we should respect/use these * resources, killing hwmod dependency. * If pdev->num_resources > 0, we assume that MEM & IRQ resources * have been allocated by OF layer already (through DTB). - * - * Non-DT Boot: - * Here, pdev->num_resources = 0, and we should get all the - * resources from hwmod. + * As preparation for the future we examine the OF provided resources + * to see if we have DMA resources provided already. In this case + * there is no need to update the resources for the device, we use the + * OF provided ones. * * TODO: Once DMA resource is available from OF layer, we should * kill filling any resources from hwmod. */ - if (res_count > pdev->num_resources) { - /* Allocate resources memory to account for new resources */ - res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL); - if (!res) - goto oda_exit3; - - /* - * If pdev->num_resources > 0, then assume that, - * MEM and IRQ resources will only come from DT and only - * fill DMA resource from hwmod layer. - */ - if (pdev->num_resources && pdev->resource) { - dev_dbg(&pdev->dev, "%s(): resources already allocated %d\n", - __func__, res_count); - memcpy(res, pdev->resource, - sizeof(struct resource) * pdev->num_resources); - _od_fill_dma_resources(od, &res[pdev->num_resources]); - } else { - dev_dbg(&pdev->dev, "%s(): using resources from hwmod %d\n", - __func__, res_count); - omap_device_fill_resources(od, res); + if (!pdev->num_resources) { + /* Count all resources for the device */ + res_count = omap_device_count_resources(od, IORESOURCE_IRQ | + IORESOURCE_DMA | + IORESOURCE_MEM); + } else { + /* Take a look if we already have DMA resource via DT */ + for (i = 0; i < pdev->num_resources; i++) { + struct resource *r = &pdev->resource[i]; + + /* We have it, no need to touch the resources */ + if (r->flags == IORESOURCE_DMA) + goto have_everything; } + /* Count only DMA resources for the device */ + res_count = omap_device_count_resources(od, IORESOURCE_DMA); + /* The device has no DMA resource, no need for update */ + if (!res_count) + goto have_everything; - ret = platform_device_add_resources(pdev, res, res_count); - kfree(res); + res_count += pdev->num_resources; + } - if (ret) - goto oda_exit3; + /* Allocate resources memory to account for new resources */ + res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL); + if (!res) + goto oda_exit3; + + if (!pdev->num_resources) { + dev_dbg(&pdev->dev, "%s: using %d resources from hwmod\n", + __func__, res_count); + omap_device_fill_resources(od, res); + } else { + dev_dbg(&pdev->dev, + "%s: appending %d DMA resources from hwmod\n", + __func__, res_count - pdev->num_resources); + memcpy(res, pdev->resource, + sizeof(struct resource) * pdev->num_resources); + _od_fill_dma_resources(od, &res[pdev->num_resources]); } + ret = platform_device_add_resources(pdev, res, res_count); + kfree(res); + + if (ret) + goto oda_exit3; + +have_everything: if (!pm_lats) { pm_lats = omap_default_latency; pm_lats_cnt = ARRAY_SIZE(omap_default_latency); |