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368 lines
9.0 KiB
368 lines
9.0 KiB
// 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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mps &= 0x7ff; |
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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 stallled */ |
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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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