-/**
- * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
- * @dwc: pointer to our context structure
- *
- * This function will a best effort FIFO allocation in order
- * to improve FIFO usage and throughput, while still allowing
- * us to enable as many endpoints as possible.
- *
- * Keep in mind that this operation will be highly dependent
- * on the configured size for RAM1 - which contains TxFifo -,
- * the amount of endpoints enabled on coreConsultant tool, and
- * the width of the Master Bus.
- *
- * In the ideal world, we would always be able to satisfy the
- * following equation:
- *
- * ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
- * (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
- *
- * Unfortunately, due to many variables that's not always the case.
- */
-int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc)
-{
- int last_fifo_depth = 0;
- int ram1_depth;
- int fifo_size;
- int mdwidth;
- int num;
-
- if (!dwc->needs_fifo_resize)
- return 0;
-
- ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
- mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
-
- /* MDWIDTH is represented in bits, we need it in bytes */
- mdwidth >>= 3;
-
- /*
- * FIXME For now we will only allocate 1 wMaxPacketSize space
- * for each enabled endpoint, later patches will come to
- * improve this algorithm so that we better use the internal
- * FIFO space
- */
- for (num = 0; num < dwc->num_in_eps; num++) {
- /* bit0 indicates direction; 1 means IN ep */
- struct dwc3_ep *dep = dwc->eps[(num << 1) | 1];
- int mult = 1;
- int tmp;
-
- if (!(dep->flags & DWC3_EP_ENABLED))
- continue;
-
- if (usb_endpoint_xfer_bulk(dep->endpoint.desc)
- || usb_endpoint_xfer_isoc(dep->endpoint.desc))
- mult = 3;
-
- /*
- * REVISIT: the following assumes we will always have enough
- * space available on the FIFO RAM for all possible use cases.
- * Make sure that's true somehow and change FIFO allocation
- * accordingly.
- *
- * If we have Bulk or Isochronous endpoints, we want
- * them to be able to be very, very fast. So we're giving
- * those endpoints a fifo_size which is enough for 3 full
- * packets
- */
- tmp = mult * (dep->endpoint.maxpacket + mdwidth);
- tmp += mdwidth;
-
- fifo_size = DIV_ROUND_UP(tmp, mdwidth);
-
- fifo_size |= (last_fifo_depth << 16);
-
- dwc3_trace(trace_dwc3_gadget, "%s: Fifo Addr %04x Size %d",
- dep->name, last_fifo_depth, fifo_size & 0xffff);
-
- dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num), fifo_size);
-
- last_fifo_depth += (fifo_size & 0xffff);
- }
-
- return 0;
-}
-