[PATCH 1/3] usb: orion-echi: Add support for the Armada 3700

Gregory CLEMENT
2017-03-08T16:24:21Z

From: jinghua <jinghua@marvell.com>

- Add a new compatoble string for the Armada 3700 SoCs

- add sbuscfg support for orion usb controller driver. For the SoCs
without hlock, need to program BAWR/BARD/AHBBRST fields in the sbuscfg
register to guarantee the AHB master's burst would not overrun or
underrun the FIFO.

- the sbuscfg register has to be set after the usb controller reset,
otherwise the value would be overridden to 0. In order to do this, the
reset callback is registered.

[gregory.clement at free-electrons.com: - reword commit and comments
- fix checkpatch warning]
Signed-off-by: jinghua <jinghua@marvell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
.../devicetree/bindings/usb/ehci-orion.txt | 4 ++-
drivers/usb/host/ehci-orion.c | 39 ++++++++++++++++++++++
2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/ehci-orion.txt b/Documentation/devicetree/bindings/usb/ehci-orion.txt
index 17c3bc858b86..9dfffc9dffec 100644
--- a/Documentation/devicetree/bindings/usb/ehci-orion.txt
+++ b/Documentation/devicetree/bindings/usb/ehci-orion.txt
@@ -1,7 +1,9 @@
* EHCI controller, Orion Marvell variants

Required properties:
-- compatible: must be "marvell,orion-ehci"
+- compatible: could be one of the following
+ "marvell,orion-ehci"
+ "marvell,armada-3700-ehci"
- reg: physical base address of the controller and length of memory mapped
region.
- interrupts: The EHCI interrupt
diff --git a/drivers/usb/host/ehci-orion.c b/drivers/usb/host/ehci-orion.c
index ee8d5faa0194..cf778e166b90 100644
--- a/drivers/usb/host/ehci-orion.c
+++ b/drivers/usb/host/ehci-orion.c
@@ -47,6 +47,21 @@
#define USB_PHY_IVREF_CTRL 0x440
#define USB_PHY_TST_GRP_CTRL 0x450

+#define USB_SBUSCFG 0x90
+#define USB_SBUSCFG_BAWR 0x6
+#define USB_SBUSCFG_BARD 0x3
+#define USB_SBUSCFG_AHBBRST 0x0
+
+/* BAWR = BARD = 3 : Align read/write bursts packets larger than 128 bytes */
+#define USB_SBUSCFG_BAWR_ALIGN_128B 0x3
+#define USB_SBUSCFG_BARD_ALIGN_128B 0x3
+/* AHBBRST = 3 : Align AHB Burst to INCR16 (64 bytes) */
+#define USB_SBUSCFG_AHBBRST_INCR16 0x3
+
+#define USB_SBUSCFG_DEF_VAL ((USB_SBUSCFG_BAWR_ALIGN_128B << USB_SBUSCFG_BAWR) \
+ | (USB_SBUSCFG_BARD_ALIGN_128B << USB_SBUSCFG_BARD) \
+ | (USB_SBUSCFG_AHBBRST_INCR16 << USB_SBUSCFG_AHBBRST))
+
#define DRIVER_DESC "EHCI orion driver"

#define hcd_to_orion_priv(h) ((struct orion_ehci_hcd *)hcd_to_ehci(h)->priv)
@@ -151,8 +166,31 @@ ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
}
}

+static int ehci_orion_drv_reset(struct usb_hcd *hcd)
+{
+ struct device *dev = hcd->self.controller;
+ int retval;
+
+ retval = ehci_setup(hcd);
+ if (retval)
+ dev_err(dev, "ehci_setup failed %d\n", retval);
+
+ /*
+ * For SoC without hlock, need to program sbuscfg value to guarantee
+ * AHB master's burst would not overrun or underrun FIFO.
+ *
+ * sbuscfg reg has to be set after usb controller reset, otherwise
+ * the value would be override to 0.
+ */
+ if (of_device_is_compatible(dev->of_node, "marvell,armada-3700-ehci"))
+ wrl(USB_SBUSCFG, USB_SBUSCFG_DEF_VAL);
+
+ return retval;
+}
+
static const struct ehci_driver_overrides orion_overrides __initconst = {
.extra_priv_size = sizeof(struct orion_ehci_hcd),
+ .reset = ehci_orion_drv_reset,
};

static int ehci_orion_drv_probe(struct platform_device *pdev)
@@ -310,6 +348,7 @@ static int 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", },
{},
};
MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);
--
2.11.0