368 lines
9.0 KiB
C
368 lines
9.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* bdc_cmd.c - BRCM BDC USB3.0 device controller
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*
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* Copyright (C) 2014 Broadcom Corporation
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*
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* Author: Ashwini Pahuja
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*/
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include "bdc.h"
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#include "bdc_cmd.h"
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#include "bdc_dbg.h"
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/* Issues a cmd to cmd processor and waits for cmd completion */
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static int bdc_issue_cmd(struct bdc *bdc, u32 cmd_sc, u32 param0,
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u32 param1, u32 param2)
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{
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u32 timeout = BDC_CMD_TIMEOUT;
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u32 cmd_status;
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u32 temp;
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bdc_writel(bdc->regs, BDC_CMDPAR0, param0);
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bdc_writel(bdc->regs, BDC_CMDPAR1, param1);
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bdc_writel(bdc->regs, BDC_CMDPAR2, param2);
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/* Issue the cmd */
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/* Make sure the cmd params are written before asking HW to exec cmd */
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wmb();
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bdc_writel(bdc->regs, BDC_CMDSC, cmd_sc | BDC_CMD_CWS | BDC_CMD_SRD);
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do {
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temp = bdc_readl(bdc->regs, BDC_CMDSC);
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dev_dbg_ratelimited(bdc->dev, "cmdsc=%x", temp);
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cmd_status = BDC_CMD_CST(temp);
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if (cmd_status != BDC_CMDS_BUSY) {
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dev_dbg(bdc->dev,
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"command completed cmd_sts:%x\n", cmd_status);
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return cmd_status;
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}
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udelay(1);
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} while (timeout--);
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dev_err(bdc->dev,
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"command operation timedout cmd_status=%d\n", cmd_status);
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return cmd_status;
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}
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/* Submits cmd and analyze the return value of bdc_issue_cmd */
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static int bdc_submit_cmd(struct bdc *bdc, u32 cmd_sc,
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u32 param0, u32 param1, u32 param2)
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{
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u32 temp, cmd_status;
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int ret;
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temp = bdc_readl(bdc->regs, BDC_CMDSC);
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dev_dbg(bdc->dev,
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"%s:CMDSC:%08x cmdsc:%08x param0=%08x param1=%08x param2=%08x\n",
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__func__, temp, cmd_sc, param0, param1, param2);
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cmd_status = BDC_CMD_CST(temp);
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if (cmd_status == BDC_CMDS_BUSY) {
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dev_err(bdc->dev, "command processor busy: %x\n", cmd_status);
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return -EBUSY;
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}
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ret = bdc_issue_cmd(bdc, cmd_sc, param0, param1, param2);
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switch (ret) {
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case BDC_CMDS_SUCC:
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dev_dbg(bdc->dev, "command completed successfully\n");
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ret = 0;
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break;
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case BDC_CMDS_PARA:
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dev_err(bdc->dev, "command parameter error\n");
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ret = -EINVAL;
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break;
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case BDC_CMDS_STAT:
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dev_err(bdc->dev, "Invalid device/ep state\n");
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ret = -EINVAL;
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break;
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case BDC_CMDS_FAIL:
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dev_err(bdc->dev, "Command failed?\n");
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ret = -EAGAIN;
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break;
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case BDC_CMDS_INTL:
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dev_err(bdc->dev, "BDC Internal error\n");
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ret = -ECONNRESET;
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break;
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case BDC_CMDS_BUSY:
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dev_err(bdc->dev,
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"command timedout waited for %dusec\n",
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BDC_CMD_TIMEOUT);
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ret = -ECONNRESET;
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break;
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default:
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dev_dbg(bdc->dev, "Unknown command completion code:%x\n", ret);
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}
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return ret;
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}
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/* Deconfigure the endpoint from HW */
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int bdc_dconfig_ep(struct bdc *bdc, struct bdc_ep *ep)
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{
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u32 cmd_sc;
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cmd_sc = BDC_SUB_CMD_DRP_EP|BDC_CMD_EPN(ep->ep_num)|BDC_CMD_EPC;
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dev_dbg(bdc->dev, "%s ep->ep_num =%d cmd_sc=%x\n", __func__,
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ep->ep_num, cmd_sc);
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return bdc_submit_cmd(bdc, cmd_sc, 0, 0, 0);
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}
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/* Reinitalize the bdlist after config ep command */
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static void ep_bd_list_reinit(struct bdc_ep *ep)
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{
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struct bdc *bdc = ep->bdc;
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struct bdc_bd *bd;
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ep->bd_list.eqp_bdi = 0;
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ep->bd_list.hwd_bdi = 0;
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bd = ep->bd_list.bd_table_array[0]->start_bd;
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dev_dbg(bdc->dev, "%s ep:%p bd:%p\n", __func__, ep, bd);
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memset(bd, 0, sizeof(struct bdc_bd));
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bd->offset[3] |= cpu_to_le32(BD_SBF);
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}
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/* Configure an endpoint */
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int bdc_config_ep(struct bdc *bdc, struct bdc_ep *ep)
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{
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const struct usb_ss_ep_comp_descriptor *comp_desc;
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const struct usb_endpoint_descriptor *desc;
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u32 param0, param1, param2, cmd_sc;
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u32 mps, mbs, mul, si;
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int ret;
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desc = ep->desc;
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comp_desc = ep->comp_desc;
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cmd_sc = mul = mbs = param2 = 0;
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param0 = lower_32_bits(ep->bd_list.bd_table_array[0]->dma);
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param1 = upper_32_bits(ep->bd_list.bd_table_array[0]->dma);
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cpu_to_le32s(¶m0);
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cpu_to_le32s(¶m1);
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dev_dbg(bdc->dev, "%s: param0=%08x param1=%08x",
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__func__, param0, param1);
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si = desc->bInterval;
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si = clamp_val(si, 1, 16) - 1;
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mps = usb_endpoint_maxp(desc);
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param2 |= mps << MP_SHIFT;
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param2 |= usb_endpoint_type(desc) << EPT_SHIFT;
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switch (bdc->gadget.speed) {
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case USB_SPEED_SUPER:
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if (usb_endpoint_xfer_int(desc) ||
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usb_endpoint_xfer_isoc(desc)) {
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param2 |= si;
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if (usb_endpoint_xfer_isoc(desc) && comp_desc)
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mul = comp_desc->bmAttributes;
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}
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param2 |= mul << EPM_SHIFT;
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if (comp_desc)
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mbs = comp_desc->bMaxBurst;
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param2 |= mbs << MB_SHIFT;
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break;
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case USB_SPEED_HIGH:
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if (usb_endpoint_xfer_isoc(desc) ||
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usb_endpoint_xfer_int(desc)) {
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param2 |= si;
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mbs = usb_endpoint_maxp_mult(desc);
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param2 |= mbs << MB_SHIFT;
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}
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break;
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case USB_SPEED_FULL:
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case USB_SPEED_LOW:
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/* the hardware accepts SI in 125usec range */
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if (usb_endpoint_xfer_isoc(desc))
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si += 3;
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/*
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* FS Int endpoints can have si of 1-255ms but the controller
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* accepts 2^bInterval*125usec, so convert ms to nearest power
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* of 2
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*/
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if (usb_endpoint_xfer_int(desc))
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si = fls(desc->bInterval * 8) - 1;
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param2 |= si;
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break;
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default:
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dev_err(bdc->dev, "UNKNOWN speed ERR\n");
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return -EINVAL;
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}
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cmd_sc |= BDC_CMD_EPC|BDC_CMD_EPN(ep->ep_num)|BDC_SUB_CMD_ADD_EP;
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dev_dbg(bdc->dev, "cmd_sc=%x param2=%08x\n", cmd_sc, param2);
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ret = bdc_submit_cmd(bdc, cmd_sc, param0, param1, param2);
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if (ret) {
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dev_err(bdc->dev, "command failed :%x\n", ret);
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return ret;
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}
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ep_bd_list_reinit(ep);
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return ret;
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}
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/*
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* Change the HW deq pointer, if this command is successful, HW will start
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* fetching the next bd from address dma_addr.
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*/
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int bdc_ep_bla(struct bdc *bdc, struct bdc_ep *ep, dma_addr_t dma_addr)
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{
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u32 param0, param1;
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u32 cmd_sc = 0;
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dev_dbg(bdc->dev, "%s: add=%08llx\n", __func__,
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(unsigned long long)(dma_addr));
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param0 = lower_32_bits(dma_addr);
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param1 = upper_32_bits(dma_addr);
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cpu_to_le32s(¶m0);
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cpu_to_le32s(¶m1);
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cmd_sc |= BDC_CMD_EPN(ep->ep_num)|BDC_CMD_BLA;
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dev_dbg(bdc->dev, "cmd_sc=%x\n", cmd_sc);
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return bdc_submit_cmd(bdc, cmd_sc, param0, param1, 0);
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}
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/* Set the address sent bu Host in SET_ADD request */
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int bdc_address_device(struct bdc *bdc, u32 add)
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{
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u32 cmd_sc = 0;
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u32 param2;
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dev_dbg(bdc->dev, "%s: add=%d\n", __func__, add);
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cmd_sc |= BDC_SUB_CMD_ADD|BDC_CMD_DVC;
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param2 = add & 0x7f;
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return bdc_submit_cmd(bdc, cmd_sc, 0, 0, param2);
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}
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/* Send a Function Wake notification packet using FH command */
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int bdc_function_wake_fh(struct bdc *bdc, u8 intf)
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{
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u32 param0, param1;
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u32 cmd_sc = 0;
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param0 = param1 = 0;
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dev_dbg(bdc->dev, "%s intf=%d\n", __func__, intf);
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cmd_sc |= BDC_CMD_FH;
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param0 |= TRA_PACKET;
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param0 |= (bdc->dev_addr << 25);
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param1 |= DEV_NOTF_TYPE;
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param1 |= (FWK_SUBTYPE<<4);
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dev_dbg(bdc->dev, "param0=%08x param1=%08x\n", param0, param1);
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return bdc_submit_cmd(bdc, cmd_sc, param0, param1, 0);
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}
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/* Send a Function Wake notification packet using DNC command */
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int bdc_function_wake(struct bdc *bdc, u8 intf)
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{
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u32 cmd_sc = 0;
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u32 param2 = 0;
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dev_dbg(bdc->dev, "%s intf=%d", __func__, intf);
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param2 |= intf;
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cmd_sc |= BDC_SUB_CMD_FWK|BDC_CMD_DNC;
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return bdc_submit_cmd(bdc, cmd_sc, 0, 0, param2);
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}
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/* Stall the endpoint */
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int bdc_ep_set_stall(struct bdc *bdc, int epnum)
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{
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u32 cmd_sc = 0;
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dev_dbg(bdc->dev, "%s epnum=%d\n", __func__, epnum);
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/* issue a stall endpoint command */
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cmd_sc |= BDC_SUB_CMD_EP_STL | BDC_CMD_EPN(epnum) | BDC_CMD_EPO;
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return bdc_submit_cmd(bdc, cmd_sc, 0, 0, 0);
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}
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/* resets the endpoint, called when host sends CLEAR_FEATURE(HALT) */
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int bdc_ep_clear_stall(struct bdc *bdc, int epnum)
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{
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struct bdc_ep *ep;
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u32 cmd_sc = 0;
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int ret;
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dev_dbg(bdc->dev, "%s: epnum=%d\n", __func__, epnum);
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ep = bdc->bdc_ep_array[epnum];
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/*
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* If we are not in stalled then stall Endpoint and issue clear stall,
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* his will reset the seq number for non EP0.
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*/
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if (epnum != 1) {
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/* if the endpoint it not stalled */
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if (!(ep->flags & BDC_EP_STALL)) {
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ret = bdc_ep_set_stall(bdc, epnum);
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if (ret)
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return ret;
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}
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}
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/* Preserve the seq number for ep0 only */
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if (epnum != 1)
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cmd_sc |= BDC_CMD_EPO_RST_SN;
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/* issue a reset endpoint command */
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cmd_sc |= BDC_SUB_CMD_EP_RST | BDC_CMD_EPN(epnum) | BDC_CMD_EPO;
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ret = bdc_submit_cmd(bdc, cmd_sc, 0, 0, 0);
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if (ret) {
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dev_err(bdc->dev, "command failed:%x\n", ret);
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return ret;
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}
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bdc_notify_xfr(bdc, epnum);
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return ret;
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}
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/* Stop the endpoint, called when software wants to dequeue some request */
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int bdc_stop_ep(struct bdc *bdc, int epnum)
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{
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struct bdc_ep *ep;
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u32 cmd_sc = 0;
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int ret;
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ep = bdc->bdc_ep_array[epnum];
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dev_dbg(bdc->dev, "%s: ep:%s ep->flags:%08x\n", __func__,
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ep->name, ep->flags);
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/* Endpoint has to be in running state to execute stop ep command */
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if (!(ep->flags & BDC_EP_ENABLED)) {
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dev_err(bdc->dev, "stop endpoint called for disabled ep\n");
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return -EINVAL;
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}
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if ((ep->flags & BDC_EP_STALL) || (ep->flags & BDC_EP_STOP))
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return 0;
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/* issue a stop endpoint command */
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cmd_sc |= BDC_CMD_EP0_XSD | BDC_SUB_CMD_EP_STP
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| BDC_CMD_EPN(epnum) | BDC_CMD_EPO;
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ret = bdc_submit_cmd(bdc, cmd_sc, 0, 0, 0);
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if (ret) {
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dev_err(bdc->dev,
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"stop endpoint command didn't complete:%d ep:%s\n",
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ret, ep->name);
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return ret;
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}
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ep->flags |= BDC_EP_STOP;
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bdc_dump_epsts(bdc);
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return ret;
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}
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