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| author | Vahram Aharonyan <vahrama@synopsys.com> | 2016-11-09 19:27:56 -0800 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2016-11-18 13:54:19 +0200 |
| commit | 0f6b80c0dbba7e0a76b6761e0f78d064b2ac9c17 (patch) | |
| tree | ee24ce389b1058121e49b79f7a14fee4f5915e00 /drivers/usb/dwc2/gadget.c | |
| parent | e6fcfb57c6f7cac1dc44cbb4e0cda5d6eef64fe0 (diff) | |
| download | op-kernel-dev-0f6b80c0dbba7e0a76b6761e0f78d064b2ac9c17.zip op-kernel-dev-0f6b80c0dbba7e0a76b6761e0f78d064b2ac9c17.tar.gz | |
usb: dwc2: gadget: Add DMA descriptor chains for EP 0
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@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc2/gadget.c')
| -rw-r--r-- | drivers/usb/dwc2/gadget.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index 4013518..729bc02 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) { |
