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