linux-kernel - [PATCH] usb: host: Add ac5 to EHCI Orion

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Message-ID: <20240107163307.3677347-1-enachman@marvell.com>
Date: Sun, 7 Jan 2024 18:33:07 +0200
From: Elad Nachman <enachman@...vell.com>
To: <stern@...land.harvard.edu>, <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <enachman@...vell.com>
Subject: [PATCH] usb: host: Add ac5 to EHCI Orion

From: Elad Nachman <enachman@...vell.com>

Add support for ac5 to the EHCI Orion platform driver.
The ac5 SOC has DDR starting at offset 0x2_0000_0000,
Hence it requires a larger than 32-bit DMA mask to operate.
Move the dma mask to be pointed by the OF match data, and
use that match data when initializng the DMA mask.

Signed-off-by: Elad Nachman <enachman@...vell.com>
---
 drivers/usb/host/ehci-orion.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/host/ehci-orion.c b/drivers/usb/host/ehci-orion.c
index 6c47ab0a491d..bcf99f31a840 100644
--- a/drivers/usb/host/ehci-orion.c
+++ b/drivers/usb/host/ehci-orion.c
@@ -65,6 +65,15 @@ struct orion_ehci_hcd {
 
 static struct hc_driver __read_mostly ehci_orion_hc_driver;
 
+/*
+ * Legacy DMA mask is 32 bit.
+ * AC5 has the DDR starting at 8GB, hence it requires
+ * a larger (34-bit) DMA mask, in order for DMA allocations
+ * to succeed:
+ */
+static const u64 dma_mask_orion =	DMA_BIT_MASK(32);
+static const u64 dma_mask_ac5 =		DMA_BIT_MASK(34);
+
 /*
  * Implement Orion USB controller specification guidelines
  */
@@ -211,6 +220,7 @@ static int ehci_orion_drv_probe(struct platform_device *pdev)
 	int irq, err;
 	enum orion_ehci_phy_ver phy_version;
 	struct orion_ehci_hcd *priv;
+	u64 *dma_mask_ptr;
 
 	if (usb_disabled())
 		return -ENODEV;
@@ -228,7 +238,8 @@ static int ehci_orion_drv_probe(struct platform_device *pdev)
 	 * set. Since shared usb code relies on it, set it here for
 	 * now. Once we have dma capability bindings this can go away.
 	 */
-	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+	dma_mask_ptr = of_device_get_match_data(&pdev->dev);
+	err = dma_coerce_mask_and_coherent(&pdev->dev, *dma_mask_ptr);
 	if (err)
 		goto err;
 
@@ -332,9 +343,9 @@ static void ehci_orion_drv_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id ehci_orion_dt_ids[] = {
-	{ .compatible = "marvell,orion-ehci", },
-	{ .compatible = "marvell,armada-3700-ehci", },
-	{},
+	{ .compatible = "marvell,orion-ehci", .data = &dma_mask_orion},
+	{ .compatible = "marvell,armada-3700-ehci", .data = &dma_mask_orion},
+	{ .compatible = "marvell,ac5-ehci", .data = &dma_mask_ac5},
 };
 MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);
 
-- 
2.25.1