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usb: ehci: Add Aspeed AST2700 support

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Unlike earlier Aspeed SoCs (AST2400/2500/2600) which are limited to
32-bit DMA addressing, the EHCI controller in AST2700 supports 64-bit
DMA. Update the EHCI platform driver to make use of this capability by
selecting a 64-bit DMA mask when the "aspeed,ast2700-ehci" compatible
is present in device tree.

Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20250928032407.27764-3-ryan_chen@aspeedtech.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ryan Chen
2025-09-28 11:24:07 +08:00
committed by Greg Kroah-Hartman
parent f39e7cdd8e
commit 274f2232a9
1 changed files with 13 additions and 2 deletions
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15
drivers/usb/host/ehci-platform.c
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@@ -27,6 +27,7 @@
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/sys_soc.h>
@@ -239,9 +240,11 @@ static int ehci_platform_probe(struct platform_device *dev)
struct usb_hcd *hcd;
struct resource *res_mem;
struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
const struct of_device_id *match;
struct ehci_platform_priv *priv;
struct ehci_hcd *ehci;
int err, irq, clk = 0;
bool dma_mask_64;
if (usb_disabled())
return -ENODEV;
@@ -253,8 +256,13 @@ static int ehci_platform_probe(struct platform_device *dev)
if (!pdata)
pdata = &ehci_platform_defaults;
dma_mask_64 = pdata->dma_mask_64;
match = of_match_device(dev->dev.driver->of_match_table, &dev->dev);
if (match && match->data)
dma_mask_64 = true;
err = dma_coerce_mask_and_coherent(&dev->dev,
pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
if (err) {
dev_err(&dev->dev, "Error: DMA mask configuration failed\n");
return err;
@@ -298,7 +306,9 @@ static int ehci_platform_probe(struct platform_device *dev)
if (of_device_is_compatible(dev->dev.of_node,
"aspeed,ast2500-ehci") ||
of_device_is_compatible(dev->dev.of_node,
"aspeed,ast2600-ehci"))
"aspeed,ast2600-ehci") ||
of_device_is_compatible(dev->dev.of_node,
"aspeed,ast2700-ehci"))
ehci->is_aspeed = 1;
if (soc_device_match(quirk_poll_match))
@@ -485,6 +495,7 @@ static const struct of_device_id vt8500_ehci_ids[] = {
{ .compatible = "wm,prizm-ehci", },
{ .compatible = "generic-ehci", },
{ .compatible = "cavium,octeon-6335-ehci", },
{ .compatible = "aspeed,ast2700-ehci", .data = (void *)1 },
{}
};
MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);