linux-kernel - [PATCH 1/2] usb: dwc2: add amcc,dwc-otg support

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Date:   Fri, 11 Nov 2016 21:59:13 +0100
From:   Christian Lamparter <chunkeey@...glemail.com>
To:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:     John Youn <johnyoun@...opsys.com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>
Subject: [PATCH 1/2] usb: dwc2: add amcc,dwc-otg support

This patch adds support for the "amcc,usb-otg" device
which is found in the PowerPC Canyonlands' dts.

The device definition was added by:
commit c89b3458d8cc ("powerpc/44x: Add USB DWC DTS entry to Canyonlands board")'
but without any driver support as the dwc2 driver wasn't
available at that time.

Note: The system can't use the generic "snps,dwc2" compatible
because of the special ahbcfg configuration. The default
GAHBCFG_HBSTLEN_INCR4 of snps,dwc2 can cause a system hang
when the USB and SATA is used concurrently.

Cc: Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc: John Youn <johnyoun@...opsys.com>
Signed-off-by: Christian Lamparter <chunkeey@...il.com>
---
v1->v2
	- moved definitons to params.c
	- removed dma_enable / host_dma parameter
	- added dma_desc_fs_enable parameter
---
 Documentation/devicetree/bindings/usb/dwc2.txt |  1 +
 drivers/usb/dwc2/params.c                      | 33 ++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/dwc2.txt b/Documentation/devicetree/bindings/usb/dwc2.txt
index 10a2a4b..6ccfe85 100644
--- a/Documentation/devicetree/bindings/usb/dwc2.txt
+++ b/Documentation/devicetree/bindings/usb/dwc2.txt
@@ -12,6 +12,7 @@ Required properties:
   - "lantiq,xrx200-usb": The DWC2 USB controller instance in Lantiq XRX SoCs;
   - "amlogic,meson8b-usb": The DWC2 USB controller instance in Amlogic Meson8b SoCs;
   - "amlogic,meson-gxbb-usb": The DWC2 USB controller instance in Amlogic S905 SoCs;
+  - "amcc,dwc-otg": The DWC2 USB controller instance in AMCC Canyonlands 460EX SoCs;
   - snps,dwc2: A generic DWC2 USB controller with default parameters.
 - reg : Should contain 1 register range (address and length)
 - interrupts : Should contain 1 interrupt
diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index 64d5c66..5d822c5 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -192,6 +192,38 @@ static const struct dwc2_core_params params_amlogic = {
 	.hibernation			= -1,
 };
 
+static const struct dwc2_core_params params_amcc_dwc_otg = {
+	.otg_cap			= DWC2_CAP_PARAM_HNP_SRP_CAPABLE,
+	.otg_ver			= -1,
+	.dma_desc_enable		= -1,
+	.dma_desc_fs_enable		= -1,
+	.speed				= -1,
+	.enable_dynamic_fifo		= -1,
+	.en_multiple_tx_fifo		= -1,
+	.host_rx_fifo_size		= -1,
+	.host_nperio_tx_fifo_size	= -1,
+	.host_perio_tx_fifo_size	= -1,
+	.max_transfer_size		= -1,
+	.max_packet_count		= -1,
+	.host_channels			= -1,
+	.phy_type			= -1,
+	.phy_utmi_width			= -1,
+	.phy_ulpi_ddr			= -1,
+	.phy_ulpi_ext_vbus		= -1,
+	.i2c_enable			= -1,
+	.ulpi_fs_ls			= -1,
+	.host_support_fs_ls_low_power	= -1,
+	.host_ls_low_power_phy_clk	= -1,
+	.ts_dline			= -1,
+	.reload_ctl			= -1,
+	/* Avoid system hang during concurrently using USB and SATA */
+	.ahbcfg				= GAHBCFG_HBSTLEN_INCR16 <<
+					  GAHBCFG_HBSTLEN_SHIFT,
+	.uframe_sched			= -1,
+	.external_id_pin_ctl		= -1,
+	.hibernation			= -1,
+};
+
 static const struct dwc2_core_params params_default = {
 	.otg_cap			= -1,
 	.otg_ver			= -1,
@@ -239,6 +271,7 @@ const struct of_device_id dwc2_of_match_table[] = {
 	{ .compatible = "samsung,s3c6400-hsotg", .data = NULL},
 	{ .compatible = "amlogic,meson8b-usb", .data = &params_amlogic },
 	{ .compatible = "amlogic,meson-gxbb-usb", .data = &params_amlogic },
+	{ .compatible = "amcc,dwc-otg", .data = &params_amcc_dwc_otg },
 	{},
 };
 MODULE_DEVICE_TABLE(of, dwc2_of_match_table);
-- 
2.10.2