79 lines
2.2 KiB
Diff
79 lines
2.2 KiB
Diff
From e286d6acbf158bc385d702aafcf1caa8da9ab8ee Mon Sep 17 00:00:00 2001
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Message-Id: <e286d6acbf158bc385d702aafcf1caa8da9ab8ee.1607085588.git.stefan@agner.ch>
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In-Reply-To: <a04331a6ba7334282836bbaa76e979c4e6be3900.1607085588.git.stefan@agner.ch>
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References: <a04331a6ba7334282836bbaa76e979c4e6be3900.1607085588.git.stefan@agner.ch>
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Date: Thu, 19 Nov 2020 18:48:19 +0100
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Subject: [PATCH 13/16] dm: Introduce DMA constraints into the core device
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model
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Calculating the DMA offset between a bus address space and CPU's every
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time we call phys_to_bus() and bus_to_phys() isn't ideal performance
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wise. This information is static and available before initializing the
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devices so parse it before the probe call an provide the DMA offset it
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in 'struct udevice' for the DMA code to use it.
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Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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---
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drivers/core/device.c | 24 ++++++++++++++++++++++++
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include/dm/device.h | 1 +
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2 files changed, 25 insertions(+)
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diff --git a/drivers/core/device.c b/drivers/core/device.c
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index 355dbd147a..484852b2ac 100644
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--- a/drivers/core/device.c
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+++ b/drivers/core/device.c
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@@ -402,6 +402,28 @@ fail:
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return ret;
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}
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+void device_get_dma_constraints(struct udevice *dev)
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+{
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+ phys_addr_t cpu;
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+ dma_addr_t bus;
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+ u64 size;
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+ int ret;
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+
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+ if (!dev_of_valid(dev))
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+ return;
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+
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+ ret = dev_get_dma_range(dev, &cpu, &bus, &size);
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+ if (ret) {
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+ /* Don't complain if no 'dma-ranges' were found */
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+ if (ret != -ENODEV)
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+ dm_warn("%s: failed to get DMA range, %d\n",
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+ dev->name, ret);
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+ return;
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+ }
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+
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+ dev->dma_offset = cpu - bus;
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+}
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+
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int device_probe(struct udevice *dev)
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{
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const struct driver *drv;
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@@ -463,6 +485,8 @@ int device_probe(struct udevice *dev)
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goto fail;
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}
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+ device_get_dma_constraints(dev);
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+
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ret = uclass_pre_probe_device(dev);
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if (ret)
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goto fail;
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diff --git a/include/dm/device.h b/include/dm/device.h
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index 953706cf52..6489f7ae61 100644
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--- a/include/dm/device.h
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+++ b/include/dm/device.h
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@@ -161,6 +161,7 @@ struct udevice {
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#ifdef CONFIG_DEVRES
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struct list_head devres_head;
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#endif
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+ u64 dma_offset;
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};
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/* Maximum sequence number supported */
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--
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2.29.2
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