From: Vahram Aharonyan <vahrama@xxxxxxxxxxxx>
Update dwc2_hsotg structure to add descriptor chains for EP 0: two DMA
descriptors for Setup phase, per one for IN/OUT data and status phases.
Add their allocation function dwc2_gadget_alloc_ctrl_desc_chains() and
its call during gadget probe.
Signed-off-by: Vahram Aharonyan <vahrama@xxxxxxxxxxxx>
Signed-off-by: John Youn <johnyoun@xxxxxxxxxxxx>
---
drivers/usb/dwc2/core.h | 13 ++++++++++++
drivers/usb/dwc2/gadget.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 67 insertions(+)
diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 32a3cfc..26d4c17 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -884,6 +884,12 @@ struct dwc2_hregs_backup {
* @ctrl_req: Request for EP0 control packets.
* @ep0_state: EP0 control transfers state
* @test_mode: USB test mode requested by the host
+ * @setup_desc_dma: EP0 setup stage desc chain DMA address
+ * @setup_desc: EP0 setup stage desc chain pointer
+ * @ctrl_in_desc_dma: EP0 IN data phase desc chain DMA address
+ * @ctrl_in_desc: EP0 IN data phase desc chain pointer
+ * @ctrl_out_desc_dma: EP0 OUT data phase desc chain DMA address
+ * @ctrl_out_desc: EP0 OUT data phase desc chain pointer
* @eps: The endpoints being supplied to the gadget framework
*/
struct dwc2_hsotg {
@@ -1027,6 +1033,13 @@ struct dwc2_hsotg {
enum dwc2_ep0_state ep0_state;
u8 test_mode;
+ dma_addr_t setup_desc_dma[2];
+ struct dwc2_dma_desc *setup_desc[2];
+ dma_addr_t ctrl_in_desc_dma;
+ struct dwc2_dma_desc *ctrl_in_desc;
+ dma_addr_t ctrl_out_desc_dma;
+ struct dwc2_dma_desc *ctrl_out_desc;
+
struct usb_gadget gadget;
unsigned int enabled:1;
unsigned int connected:1;
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 4013518..729bc02d 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -324,6 +324,54 @@ static void dwc2_hsotg_unmap_dma(struct dwc2_hsotg *hsotg,
usb_gadget_unmap_request(&hsotg->gadget, req, hs_ep->dir_in);
}
+/*
+ * dwc2_gadget_alloc_ctrl_desc_chains - allocate DMA descriptor chains
+ * for Control endpoint
+ * @hsotg: The device state.
+ *
+ * This function will allocate 4 descriptor chains for EP 0: 2 for
+ * Setup stage, per one for IN and OUT data/status transactions.
+ */
+static int dwc2_gadget_alloc_ctrl_desc_chains(struct dwc2_hsotg *hsotg)
+{
+ hsotg->setup_desc[0] =
+ dmam_alloc_coherent(hsotg->dev,
+ sizeof(struct dwc2_dma_desc),
+ &hsotg->setup_desc_dma[0],
+ GFP_KERNEL);
+ if (!hsotg->setup_desc[0])
+ goto fail;
+
+ hsotg->setup_desc[1] =
+ dmam_alloc_coherent(hsotg->dev,
+ sizeof(struct dwc2_dma_desc),
+ &hsotg->setup_desc_dma[1],
+ GFP_KERNEL);
+ if (!hsotg->setup_desc[1])
+ goto fail;
+
+ hsotg->ctrl_in_desc =
+ dmam_alloc_coherent(hsotg->dev,
+ sizeof(struct dwc2_dma_desc),
+ &hsotg->ctrl_in_desc_dma,
+ GFP_KERNEL);
+ if (!hsotg->ctrl_in_desc)
+ goto fail;
+
+ hsotg->ctrl_out_desc =
+ dmam_alloc_coherent(hsotg->dev,
+ sizeof(struct dwc2_dma_desc),
+ &hsotg->ctrl_out_desc_dma,
+ GFP_KERNEL);
+ if (!hsotg->ctrl_out_desc)
+ goto fail;
+
+ return 0;
+
+fail:
+ return -ENOMEM;
+}
+
/**
* dwc2_hsotg_write_fifo - write packet Data to the TxFIFO
* @hsotg: The controller state.
@@ -3857,6 +3905,12 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq)
if (!hsotg->ep0_buff)
return -ENOMEM;
+ if (using_desc_dma(hsotg)) {
+ ret = dwc2_gadget_alloc_ctrl_desc_chains(hsotg);
+ if (ret < 0)
+ return ret;
+ }
+
ret = devm_request_irq(hsotg->dev, irq, dwc2_hsotg_irq, IRQF_SHARED,
dev_name(hsotg->dev), hsotg);
if (ret < 0) {
--
2.10.0
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