OSCL-LXR linux-6.0.1/​drivers/​usb/​renesas_usbhs/​fifo.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-1.0+
 /*
  * Renesas USB driver
  *
  * Copyright (C) 2011 Renesas Solutions Corp.
  * Copyright (C) 2019 Renesas Electronics Corporation
  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
  */
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/scatterlist.h>
 #include "common.h"
 #include "pipe.h"
 
 #define usbhsf_get_cfifo(p) (&((p)->fifo_info.cfifo))
 
 #define usbhsf_fifo_is_busy(f)  ((f)->pipe) /* see usbhs_pipe_select_fifo */
 
 /*
  *      packet initialize
  */
 void usbhs_pkt_init(struct usbhs_pkt *pkt)
 {
     INIT_LIST_HEAD(&pkt->node);
 }
 
 /*
  *      packet control function
  */
 static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
     struct device *dev = usbhs_priv_to_dev(priv);
 
     dev_err(dev, "null handler\n");
 
     return -EINVAL;
 }
 
 static const struct usbhs_pkt_handle usbhsf_null_handler = {
     .prepare = usbhsf_null_handle,
     .try_run = usbhsf_null_handle,
 };
 
 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
             void (*done)(struct usbhs_priv *priv,
                  struct usbhs_pkt *pkt),
             void *buf, int len, int zero, int sequence)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct device *dev = usbhs_priv_to_dev(priv);
     unsigned long flags;
 
     if (!done) {
         dev_err(dev, "no done function\n");
         return;
     }
 
     /********************  spin lock ********************/
     usbhs_lock(priv, flags);
 
     if (!pipe->handler) {
         dev_err(dev, "no handler function\n");
         pipe->handler = &usbhsf_null_handler;
     }
 
     list_move_tail(&pkt->node, &pipe->list);
 
     /*
      * each pkt must hold own handler.
      * because handler might be changed by its situation.
      * dma handler -> pio handler.
      */
     pkt->pipe   = pipe;
     pkt->buf    = buf;
     pkt->handler    = pipe->handler;
     pkt->length = len;
     pkt->zero   = zero;
     pkt->actual = 0;
     pkt->done   = done;
     pkt->sequence   = sequence;
 
     usbhs_unlock(priv, flags);
     /********************  spin unlock ******************/
 }
 
 static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
 {
     list_del_init(&pkt->node);
 }
 
 struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
 {
     return list_first_entry_or_null(&pipe->list, struct usbhs_pkt, node);
 }
 
 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
                  struct usbhs_fifo *fifo);
 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
                         struct usbhs_pkt *pkt);
 #define usbhsf_dma_map(p)   __usbhsf_dma_map_ctrl(p, 1)
 #define usbhsf_dma_unmap(p) __usbhsf_dma_map_ctrl(p, 0)
 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map);
 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable);
 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable);
 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
     unsigned long flags;
 
     /********************  spin lock ********************/
     usbhs_lock(priv, flags);
 
     usbhs_pipe_disable(pipe);
 
     if (!pkt)
         pkt = __usbhsf_pkt_get(pipe);
 
     if (pkt) {
         struct dma_chan *chan = NULL;
 
         if (fifo)
             chan = usbhsf_dma_chan_get(fifo, pkt);
         if (chan) {
             dmaengine_terminate_all(chan);
             usbhsf_dma_unmap(pkt);
         } else {
             if (usbhs_pipe_is_dir_in(pipe))
                 usbhsf_rx_irq_ctrl(pipe, 0);
             else
                 usbhsf_tx_irq_ctrl(pipe, 0);
         }
 
         usbhs_pipe_clear_without_sequence(pipe, 0, 0);
         usbhs_pipe_running(pipe, 0);
 
         __usbhsf_pkt_del(pkt);
     }
 
     if (fifo)
         usbhsf_fifo_unselect(pipe, fifo);
 
     usbhs_unlock(priv, flags);
     /********************  spin unlock ******************/
 
     return pkt;
 }
 
 enum {
     USBHSF_PKT_PREPARE,
     USBHSF_PKT_TRY_RUN,
     USBHSF_PKT_DMA_DONE,
 };
 
 static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_pkt *pkt;
     struct device *dev = usbhs_priv_to_dev(priv);
     int (*func)(struct usbhs_pkt *pkt, int *is_done);
     unsigned long flags;
     int ret = 0;
     int is_done = 0;
 
     /********************  spin lock ********************/
     usbhs_lock(priv, flags);
 
     pkt = __usbhsf_pkt_get(pipe);
     if (!pkt) {
         ret = -EINVAL;
         goto __usbhs_pkt_handler_end;
     }
 
     switch (type) {
     case USBHSF_PKT_PREPARE:
         func = pkt->handler->prepare;
         break;
     case USBHSF_PKT_TRY_RUN:
         func = pkt->handler->try_run;
         break;
     case USBHSF_PKT_DMA_DONE:
         func = pkt->handler->dma_done;
         break;
     default:
         dev_err(dev, "unknown pkt handler\n");
         goto __usbhs_pkt_handler_end;
     }
 
     if (likely(func))
         ret = func(pkt, &is_done);
 
     if (is_done)
         __usbhsf_pkt_del(pkt);
 
 __usbhs_pkt_handler_end:
     usbhs_unlock(priv, flags);
     /********************  spin unlock ******************/
 
     if (is_done) {
         pkt->done(priv, pkt);
         usbhs_pkt_start(pipe);
     }
 
     return ret;
 }
 
 void usbhs_pkt_start(struct usbhs_pipe *pipe)
 {
     usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
 }
 
 /*
  *      irq enable/disable function
  */
 #define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
 #define usbhsf_irq_callback_ctrl(pipe, status, enable)          \
     ({                              \
         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); \
         struct usbhs_mod *mod = usbhs_mod_get_current(priv);    \
         u16 status = (1 << usbhs_pipe_number(pipe));        \
         if (!mod)                       \
             return;                     \
         if (enable)                     \
             mod->status |= status;              \
         else                            \
             mod->status &= ~status;             \
         usbhs_irq_callback_update(priv, mod);           \
     })
 
 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 {
     /*
      * And DCP pipe can NOT use "ready interrupt" for "send"
      * it should use "empty" interrupt.
      * see
      *   "Operation" - "Interrupt Function" - "BRDY Interrupt"
      *
      * on the other hand, normal pipe can use "ready interrupt" for "send"
      * even though it is single/double buffer
      */
     if (usbhs_pipe_is_dcp(pipe))
         usbhsf_irq_empty_ctrl(pipe, enable);
     else
         usbhsf_irq_ready_ctrl(pipe, enable);
 }
 
 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 {
     usbhsf_irq_ready_ctrl(pipe, enable);
 }
 
 /*
  *      FIFO ctrl
  */
 static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
                    struct usbhs_fifo *fifo)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 
     usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
 }
 
 static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
                    struct usbhs_fifo *fifo)
 {
     /* The FIFO port is accessible */
     if (usbhs_read(priv, fifo->ctr) & FRDY)
         return 0;
 
     return -EBUSY;
 }
 
 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
                   struct usbhs_fifo *fifo)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     int ret = 0;
 
     if (!usbhs_pipe_is_dcp(pipe)) {
         /*
          * This driver checks the pipe condition first to avoid -EBUSY
          * from usbhsf_fifo_barrier() if the pipe is RX direction and
          * empty.
          */
         if (usbhs_pipe_is_dir_in(pipe))
             ret = usbhs_pipe_is_accessible(pipe);
         if (!ret)
             ret = usbhsf_fifo_barrier(priv, fifo);
     }
 
     /*
      * if non-DCP pipe, this driver should set BCLR when
      * usbhsf_fifo_barrier() returns 0.
      */
     if (!ret)
         usbhs_write(priv, fifo->ctr, BCLR);
 }
 
 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
                    struct usbhs_fifo *fifo)
 {
     return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
 }
 
 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
                  struct usbhs_fifo *fifo)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 
     usbhs_pipe_select_fifo(pipe, NULL);
     usbhs_write(priv, fifo->sel, 0);
 }
 
 static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
                   struct usbhs_fifo *fifo,
                   int write)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct device *dev = usbhs_priv_to_dev(priv);
     int timeout = 1024;
     u16 mask = ((1 << 5) | 0xF);        /* mask of ISEL | CURPIPE */
     u16 base = usbhs_pipe_number(pipe); /* CURPIPE */
 
     if (usbhs_pipe_is_busy(pipe) ||
         usbhsf_fifo_is_busy(fifo))
         return -EBUSY;
 
     if (usbhs_pipe_is_dcp(pipe)) {
         base |= (1 == write) << 5;  /* ISEL */
 
         if (usbhs_mod_is_host(priv))
             usbhs_dcp_dir_for_host(pipe, write);
     }
 
     /* "base" will be used below  */
     usbhs_write(priv, fifo->sel, base | MBW_32);
 
     /* check ISEL and CURPIPE value */
     while (timeout--) {
         if (base == (mask & usbhs_read(priv, fifo->sel))) {
             usbhs_pipe_select_fifo(pipe, fifo);
             return 0;
         }
         udelay(10);
     }
 
     dev_err(dev, "fifo select error\n");
 
     return -EIO;
 }
 
 /*
  *      DCP status stage
  */
 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
     struct device *dev = usbhs_priv_to_dev(priv);
     int ret;
 
     usbhs_pipe_disable(pipe);
 
     ret = usbhsf_fifo_select(pipe, fifo, 1);
     if (ret < 0) {
         dev_err(dev, "%s() failed\n", __func__);
         return ret;
     }
 
     usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 
     usbhsf_fifo_clear(pipe, fifo);
     usbhsf_send_terminator(pipe, fifo);
 
     usbhsf_fifo_unselect(pipe, fifo);
 
     usbhsf_tx_irq_ctrl(pipe, 1);
     usbhs_pipe_enable(pipe);
 
     return ret;
 }
 
 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
     struct device *dev = usbhs_priv_to_dev(priv);
     int ret;
 
     usbhs_pipe_disable(pipe);
 
     ret = usbhsf_fifo_select(pipe, fifo, 0);
     if (ret < 0) {
         dev_err(dev, "%s() fail\n", __func__);
         return ret;
     }
 
     usbhs_pipe_sequence_data1(pipe); /* DATA1 */
     usbhsf_fifo_clear(pipe, fifo);
 
     usbhsf_fifo_unselect(pipe, fifo);
 
     usbhsf_rx_irq_ctrl(pipe, 1);
     usbhs_pipe_enable(pipe);
 
     return ret;
 
 }
 
 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
 
     if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
         usbhsf_tx_irq_ctrl(pipe, 0);
     else
         usbhsf_rx_irq_ctrl(pipe, 0);
 
     pkt->actual = pkt->length;
     *is_done = 1;
 
     return 0;
 }
 
 const struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
     .prepare = usbhs_dcp_dir_switch_to_write,
     .try_run = usbhs_dcp_dir_switch_done,
 };
 
 const struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
     .prepare = usbhs_dcp_dir_switch_to_read,
     .try_run = usbhs_dcp_dir_switch_done,
 };
 
 /*
  *      DCP data stage (push)
  */
 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
 
     usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 
     /*
      * change handler to PIO push
      */
     pkt->handler = &usbhs_fifo_pio_push_handler;
 
     return pkt->handler->prepare(pkt, is_done);
 }
 
 const struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
     .prepare = usbhsf_dcp_data_stage_try_push,
 };
 
 /*
  *      DCP data stage (pop)
  */
 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
                          int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
 
     if (usbhs_pipe_is_busy(pipe))
         return 0;
 
     /*
      * prepare pop for DCP should
      *  - change DCP direction,
      *  - clear fifo
      *  - DATA1
      */
     usbhs_pipe_disable(pipe);
 
     usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 
     usbhsf_fifo_select(pipe, fifo, 0);
     usbhsf_fifo_clear(pipe, fifo);
     usbhsf_fifo_unselect(pipe, fifo);
 
     /*
      * change handler to PIO pop
      */
     pkt->handler = &usbhs_fifo_pio_pop_handler;
 
     return pkt->handler->prepare(pkt, is_done);
 }
 
 const struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
     .prepare = usbhsf_dcp_data_stage_prepare_pop,
 };
 
 /*
  *      PIO push handler
  */
 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct device *dev = usbhs_priv_to_dev(priv);
     struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
     void __iomem *addr = priv->base + fifo->port;
     u8 *buf;
     int maxp = usbhs_pipe_get_maxpacket(pipe);
     int total_len;
     int i, ret, len;
     int is_short;
 
     usbhs_pipe_data_sequence(pipe, pkt->sequence);
     pkt->sequence = -1; /* -1 sequence will be ignored */
 
     usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
 
     ret = usbhsf_fifo_select(pipe, fifo, 1);
     if (ret < 0)
         return 0;
 
     ret = usbhs_pipe_is_accessible(pipe);
     if (ret < 0) {
         /* inaccessible pipe is not an error */
         ret = 0;
         goto usbhs_fifo_write_busy;
     }
 
     ret = usbhsf_fifo_barrier(priv, fifo);
     if (ret < 0)
         goto usbhs_fifo_write_busy;
 
     buf     = pkt->buf    + pkt->actual;
     len     = pkt->length - pkt->actual;
     len     = min(len, maxp);
     total_len   = len;
     is_short    = total_len < maxp;
 
     /*
      * FIXME
      *
      * 32-bit access only
      */
     if (len >= 4 && !((unsigned long)buf & 0x03)) {
         iowrite32_rep(addr, buf, len / 4);
         len %= 4;
         buf += total_len - len;
     }
 
     /* the rest operation */
     if (usbhs_get_dparam(priv, cfifo_byte_addr)) {
         for (i = 0; i < len; i++)
             iowrite8(buf[i], addr + (i & 0x03));
     } else {
         for (i = 0; i < len; i++)
             iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
     }
 
     /*
      * variable update
      */
     pkt->actual += total_len;
 
     if (pkt->actual < pkt->length)
         *is_done = 0;       /* there are remainder data */
     else if (is_short)
         *is_done = 1;       /* short packet */
     else
         *is_done = !pkt->zero;  /* send zero packet ? */
 
     /*
      * pipe/irq handling
      */
     if (is_short)
         usbhsf_send_terminator(pipe, fifo);
 
     usbhsf_tx_irq_ctrl(pipe, !*is_done);
     usbhs_pipe_running(pipe, !*is_done);
     usbhs_pipe_enable(pipe);
 
     dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
         usbhs_pipe_number(pipe),
         pkt->length, pkt->actual, *is_done, pkt->zero);
 
     usbhsf_fifo_unselect(pipe, fifo);
 
     return 0;
 
 usbhs_fifo_write_busy:
     usbhsf_fifo_unselect(pipe, fifo);
 
     /*
      * pipe is busy.
      * retry in interrupt
      */
     usbhsf_tx_irq_ctrl(pipe, 1);
     usbhs_pipe_running(pipe, 1);
 
     return ret;
 }
 
 static int usbhsf_pio_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 {
     if (usbhs_pipe_is_running(pkt->pipe))
         return 0;
 
     return usbhsf_pio_try_push(pkt, is_done);
 }
 
 const struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
     .prepare = usbhsf_pio_prepare_push,
     .try_run = usbhsf_pio_try_push,
 };
 
 /*
  *      PIO pop handler
  */
 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
 
     if (usbhs_pipe_is_busy(pipe))
         return 0;
 
     if (usbhs_pipe_is_running(pipe))
         return 0;
 
     /*
      * pipe enable to prepare packet receive
      */
     usbhs_pipe_data_sequence(pipe, pkt->sequence);
     pkt->sequence = -1; /* -1 sequence will be ignored */
 
     if (usbhs_pipe_is_dcp(pipe))
         usbhsf_fifo_clear(pipe, fifo);
 
     usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
     usbhs_pipe_enable(pipe);
     usbhs_pipe_running(pipe, 1);
     usbhsf_rx_irq_ctrl(pipe, 1);
 
     return 0;
 }
 
 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct device *dev = usbhs_priv_to_dev(priv);
     struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
     void __iomem *addr = priv->base + fifo->port;
     u8 *buf;
     u32 data = 0;
     int maxp = usbhs_pipe_get_maxpacket(pipe);
     int rcv_len, len;
     int i, ret;
     int total_len = 0;
 
     ret = usbhsf_fifo_select(pipe, fifo, 0);
     if (ret < 0)
         return 0;
 
     ret = usbhsf_fifo_barrier(priv, fifo);
     if (ret < 0)
         goto usbhs_fifo_read_busy;
 
     rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
 
     buf     = pkt->buf    + pkt->actual;
     len     = pkt->length - pkt->actual;
     len     = min(len, rcv_len);
     total_len   = len;
 
     /*
      * update actual length first here to decide disable pipe.
      * if this pipe keeps BUF status and all data were popped,
      * then, next interrupt/token will be issued again
      */
     pkt->actual += total_len;
 
     if ((pkt->actual == pkt->length) || /* receive all data */
         (total_len < maxp)) {       /* short packet */
         *is_done = 1;
         usbhsf_rx_irq_ctrl(pipe, 0);
         usbhs_pipe_running(pipe, 0);
         /*
          * If function mode, since this controller is possible to enter
          * Control Write status stage at this timing, this driver
          * should not disable the pipe. If such a case happens, this
          * controller is not able to complete the status stage.
          */
         if (!usbhs_mod_is_host(priv) && !usbhs_pipe_is_dcp(pipe))
             usbhs_pipe_disable(pipe);   /* disable pipe first */
     }
 
     /*
      * Buffer clear if Zero-Length packet
      *
      * see
      * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
      */
     if (0 == rcv_len) {
         pkt->zero = 1;
         usbhsf_fifo_clear(pipe, fifo);
         goto usbhs_fifo_read_end;
     }
 
     /*
      * FIXME
      *
      * 32-bit access only
      */
     if (len >= 4 && !((unsigned long)buf & 0x03)) {
         ioread32_rep(addr, buf, len / 4);
         len %= 4;
         buf += total_len - len;
     }
 
     /* the rest operation */
     for (i = 0; i < len; i++) {
         if (!(i & 0x03))
             data = ioread32(addr);
 
         buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
     }
 
 usbhs_fifo_read_end:
     dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
         usbhs_pipe_number(pipe),
         pkt->length, pkt->actual, *is_done, pkt->zero);
 
 usbhs_fifo_read_busy:
     usbhsf_fifo_unselect(pipe, fifo);
 
     return ret;
 }
 
 const struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
     .prepare = usbhsf_prepare_pop,
     .try_run = usbhsf_pio_try_pop,
 };
 
 /*
  *      DCP ctrol statge handler
  */
 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
 {
     usbhs_dcp_control_transfer_done(pkt->pipe);
 
     *is_done = 1;
 
     return 0;
 }
 
 const struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
     .prepare = usbhsf_ctrl_stage_end,
     .try_run = usbhsf_ctrl_stage_end,
 };
 
 /*
  *      DMA fifo functions
  */
 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
                         struct usbhs_pkt *pkt)
 {
     if (&usbhs_fifo_dma_push_handler == pkt->handler)
         return fifo->tx_chan;
 
     if (&usbhs_fifo_dma_pop_handler == pkt->handler)
         return fifo->rx_chan;
 
     return NULL;
 }
 
 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
                           struct usbhs_pkt *pkt)
 {
     struct usbhs_fifo *fifo;
     int i;
 
     usbhs_for_each_dfifo(priv, fifo, i) {
         if (usbhsf_dma_chan_get(fifo, pkt) &&
             !usbhsf_fifo_is_busy(fifo))
             return fifo;
     }
 
     return NULL;
 }
 
 #define usbhsf_dma_start(p, f)  __usbhsf_dma_ctrl(p, f, DREQE)
 #define usbhsf_dma_stop(p, f)   __usbhsf_dma_ctrl(p, f, 0)
 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
                   struct usbhs_fifo *fifo,
                   u16 dreqe)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 
     usbhs_bset(priv, fifo->sel, DREQE, dreqe);
 }
 
 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
     struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
     struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
 
     return info->dma_map_ctrl(chan->device->dev, pkt, map);
 }
 
 static void usbhsf_dma_complete(void *arg,
                 const struct dmaengine_result *result);
 static void usbhsf_dma_xfer_preparing(struct usbhs_pkt *pkt)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_fifo *fifo;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct dma_async_tx_descriptor *desc;
     struct dma_chan *chan;
     struct device *dev = usbhs_priv_to_dev(priv);
     enum dma_transfer_direction dir;
     dma_cookie_t cookie;
 
     fifo = usbhs_pipe_to_fifo(pipe);
     if (!fifo)
         return;
 
     chan = usbhsf_dma_chan_get(fifo, pkt);
     dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
 
     desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
                     pkt->trans, dir,
                     DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
     if (!desc)
         return;
 
     desc->callback_result   = usbhsf_dma_complete;
     desc->callback_param    = pkt;
 
     cookie = dmaengine_submit(desc);
     if (cookie < 0) {
         dev_err(dev, "Failed to submit dma descriptor\n");
         return;
     }
 
     dev_dbg(dev, "  %s %d (%d/ %d)\n",
         fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
 
     usbhs_pipe_running(pipe, 1);
     usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
     dma_async_issue_pending(chan);
     usbhsf_dma_start(pipe, fifo);
     usbhs_pipe_enable(pipe);
 }
 
 static void xfer_work(struct work_struct *work)
 {
     struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     unsigned long flags;
 
     usbhs_lock(priv, flags);
     usbhsf_dma_xfer_preparing(pkt);
     usbhs_unlock(priv, flags);
 }
 
 /*
  *      DMA push handler
  */
 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_fifo *fifo;
     int len = pkt->length - pkt->actual;
     int ret;
     uintptr_t align_mask;
 
     if (usbhs_pipe_is_busy(pipe))
         return 0;
 
     /* use PIO if packet is less than pio_dma_border or pipe is DCP */
     if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
         usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
         goto usbhsf_pio_prepare_push;
 
     /* check data length if this driver don't use USB-DMAC */
     if (!usbhs_get_dparam(priv, has_usb_dmac) && len & 0x7)
         goto usbhsf_pio_prepare_push;
 
     /* check buffer alignment */
     align_mask = usbhs_get_dparam(priv, has_usb_dmac) ?
                     USBHS_USB_DMAC_XFER_SIZE - 1 : 0x7;
     if ((uintptr_t)(pkt->buf + pkt->actual) & align_mask)
         goto usbhsf_pio_prepare_push;
 
     /* return at this time if the pipe is running */
     if (usbhs_pipe_is_running(pipe))
         return 0;
 
     /* get enable DMA fifo */
     fifo = usbhsf_get_dma_fifo(priv, pkt);
     if (!fifo)
         goto usbhsf_pio_prepare_push;
 
     ret = usbhsf_fifo_select(pipe, fifo, 0);
     if (ret < 0)
         goto usbhsf_pio_prepare_push;
 
     if (usbhsf_dma_map(pkt) < 0)
         goto usbhsf_pio_prepare_push_unselect;
 
     pkt->trans = len;
 
     usbhsf_tx_irq_ctrl(pipe, 0);
     /* FIXME: Workaound for usb dmac that driver can be used in atomic */
     if (usbhs_get_dparam(priv, has_usb_dmac)) {
         usbhsf_dma_xfer_preparing(pkt);
     } else {
         INIT_WORK(&pkt->work, xfer_work);
         schedule_work(&pkt->work);
     }
 
     return 0;
 
 usbhsf_pio_prepare_push_unselect:
     usbhsf_fifo_unselect(pipe, fifo);
 usbhsf_pio_prepare_push:
     /*
      * change handler to PIO
      */
     pkt->handler = &usbhs_fifo_pio_push_handler;
 
     return pkt->handler->prepare(pkt, is_done);
 }
 
 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     int is_short = pkt->trans % usbhs_pipe_get_maxpacket(pipe);
 
     pkt->actual += pkt->trans;
 
     if (pkt->actual < pkt->length)
         *is_done = 0;       /* there are remainder data */
     else if (is_short)
         *is_done = 1;       /* short packet */
     else
         *is_done = !pkt->zero;  /* send zero packet? */
 
     usbhs_pipe_running(pipe, !*is_done);
 
     usbhsf_dma_stop(pipe, pipe->fifo);
     usbhsf_dma_unmap(pkt);
     usbhsf_fifo_unselect(pipe, pipe->fifo);
 
     if (!*is_done) {
         /* change handler to PIO */
         pkt->handler = &usbhs_fifo_pio_push_handler;
         return pkt->handler->try_run(pkt, is_done);
     }
 
     return 0;
 }
 
 const struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
     .prepare    = usbhsf_dma_prepare_push,
     .dma_done   = usbhsf_dma_push_done,
 };
 
 /*
  *      DMA pop handler
  */
 
 static int usbhsf_dma_prepare_pop_with_rx_irq(struct usbhs_pkt *pkt,
                           int *is_done)
 {
     return usbhsf_prepare_pop(pkt, is_done);
 }
 
 static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
                         int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_fifo *fifo;
     int ret;
 
     if (usbhs_pipe_is_busy(pipe))
         return 0;
 
     /* use PIO if packet is less than pio_dma_border or pipe is DCP */
     if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
         usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
         goto usbhsf_pio_prepare_pop;
 
     fifo = usbhsf_get_dma_fifo(priv, pkt);
     if (!fifo)
         goto usbhsf_pio_prepare_pop;
 
     if ((uintptr_t)pkt->buf & (USBHS_USB_DMAC_XFER_SIZE - 1))
         goto usbhsf_pio_prepare_pop;
 
     /* return at this time if the pipe is running */
     if (usbhs_pipe_is_running(pipe))
         return 0;
 
     usbhs_pipe_config_change_bfre(pipe, 1);
 
     ret = usbhsf_fifo_select(pipe, fifo, 0);
     if (ret < 0)
         goto usbhsf_pio_prepare_pop;
 
     if (usbhsf_dma_map(pkt) < 0)
         goto usbhsf_pio_prepare_pop_unselect;
 
     /* DMA */
 
     /*
      * usbhs_fifo_dma_pop_handler :: prepare
      * enabled irq to come here.
      * but it is no longer needed for DMA. disable it.
      */
     usbhsf_rx_irq_ctrl(pipe, 0);
 
     pkt->trans = pkt->length;
 
     usbhsf_dma_xfer_preparing(pkt);
 
     return 0;
 
 usbhsf_pio_prepare_pop_unselect:
     usbhsf_fifo_unselect(pipe, fifo);
 usbhsf_pio_prepare_pop:
 
     /*
      * change handler to PIO
      */
     pkt->handler = &usbhs_fifo_pio_pop_handler;
     usbhs_pipe_config_change_bfre(pipe, 0);
 
     return pkt->handler->prepare(pkt, is_done);
 }
 
 static int usbhsf_dma_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
 
     if (usbhs_get_dparam(priv, has_usb_dmac))
         return usbhsf_dma_prepare_pop_with_usb_dmac(pkt, is_done);
     else
         return usbhsf_dma_prepare_pop_with_rx_irq(pkt, is_done);
 }
 
 static int usbhsf_dma_try_pop_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_fifo *fifo;
     int len, ret;
 
     if (usbhs_pipe_is_busy(pipe))
         return 0;
 
     if (usbhs_pipe_is_dcp(pipe))
         goto usbhsf_pio_prepare_pop;
 
     /* get enable DMA fifo */
     fifo = usbhsf_get_dma_fifo(priv, pkt);
     if (!fifo)
         goto usbhsf_pio_prepare_pop;
 
     if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
         goto usbhsf_pio_prepare_pop;
 
     ret = usbhsf_fifo_select(pipe, fifo, 0);
     if (ret < 0)
         goto usbhsf_pio_prepare_pop;
 
     /* use PIO if packet is less than pio_dma_border */
     len = usbhsf_fifo_rcv_len(priv, fifo);
     len = min(pkt->length - pkt->actual, len);
     if (len & 0x7) /* 8byte alignment */
         goto usbhsf_pio_prepare_pop_unselect;
 
     if (len < usbhs_get_dparam(priv, pio_dma_border))
         goto usbhsf_pio_prepare_pop_unselect;
 
     ret = usbhsf_fifo_barrier(priv, fifo);
     if (ret < 0)
         goto usbhsf_pio_prepare_pop_unselect;
 
     if (usbhsf_dma_map(pkt) < 0)
         goto usbhsf_pio_prepare_pop_unselect;
 
     /* DMA */
 
     /*
      * usbhs_fifo_dma_pop_handler :: prepare
      * enabled irq to come here.
      * but it is no longer needed for DMA. disable it.
      */
     usbhsf_rx_irq_ctrl(pipe, 0);
 
     pkt->trans = len;
 
     INIT_WORK(&pkt->work, xfer_work);
     schedule_work(&pkt->work);
 
     return 0;
 
 usbhsf_pio_prepare_pop_unselect:
     usbhsf_fifo_unselect(pipe, fifo);
 usbhsf_pio_prepare_pop:
 
     /*
      * change handler to PIO
      */
     pkt->handler = &usbhs_fifo_pio_pop_handler;
 
     return pkt->handler->try_run(pkt, is_done);
 }
 
 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
 
     BUG_ON(usbhs_get_dparam(priv, has_usb_dmac));
 
     return usbhsf_dma_try_pop_with_rx_irq(pkt, is_done);
 }
 
 static int usbhsf_dma_pop_done_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     int maxp = usbhs_pipe_get_maxpacket(pipe);
 
     usbhsf_dma_stop(pipe, pipe->fifo);
     usbhsf_dma_unmap(pkt);
     usbhsf_fifo_unselect(pipe, pipe->fifo);
 
     pkt->actual += pkt->trans;
 
     if ((pkt->actual == pkt->length) || /* receive all data */
         (pkt->trans < maxp)) {      /* short packet */
         *is_done = 1;
         usbhs_pipe_running(pipe, 0);
     } else {
         /* re-enable */
         usbhs_pipe_running(pipe, 0);
         usbhsf_prepare_pop(pkt, is_done);
     }
 
     return 0;
 }
 
 static size_t usbhs_dma_calc_received_size(struct usbhs_pkt *pkt,
                        struct dma_chan *chan, int dtln)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     size_t received_size;
     int maxp = usbhs_pipe_get_maxpacket(pipe);
 
     received_size = pkt->length - pkt->dma_result->residue;
 
     if (dtln) {
         received_size -= USBHS_USB_DMAC_XFER_SIZE;
         received_size &= ~(maxp - 1);
         received_size += dtln;
     }
 
     return received_size;
 }
 
 static int usbhsf_dma_pop_done_with_usb_dmac(struct usbhs_pkt *pkt,
                          int *is_done)
 {
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
     struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
     int rcv_len;
 
     /*
      * Since the driver disables rx_irq in DMA mode, the interrupt handler
      * cannot the BRDYSTS. So, the function clears it here because the
      * driver may use PIO mode next time.
      */
     usbhs_xxxsts_clear(priv, BRDYSTS, usbhs_pipe_number(pipe));
 
     rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
     usbhsf_fifo_clear(pipe, fifo);
     pkt->actual = usbhs_dma_calc_received_size(pkt, chan, rcv_len);
 
     usbhs_pipe_running(pipe, 0);
     usbhsf_dma_stop(pipe, fifo);
     usbhsf_dma_unmap(pkt);
     usbhsf_fifo_unselect(pipe, pipe->fifo);
 
     /* The driver can assume the rx transaction is always "done" */
     *is_done = 1;
 
     return 0;
 }
 
 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
 
     if (usbhs_get_dparam(priv, has_usb_dmac))
         return usbhsf_dma_pop_done_with_usb_dmac(pkt, is_done);
     else
         return usbhsf_dma_pop_done_with_rx_irq(pkt, is_done);
 }
 
 const struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
     .prepare    = usbhsf_dma_prepare_pop,
     .try_run    = usbhsf_dma_try_pop,
     .dma_done   = usbhsf_dma_pop_done
 };
 
 /*
  *      DMA setting
  */
 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
 {
     struct sh_dmae_slave *slave = param;
 
     /*
      * FIXME
      *
      * usbhs doesn't recognize id = 0 as valid DMA
      */
     if (0 == slave->shdma_slave.slave_id)
         return false;
 
     chan->private = slave;
 
     return true;
 }
 
 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
 {
     if (fifo->tx_chan)
         dma_release_channel(fifo->tx_chan);
     if (fifo->rx_chan)
         dma_release_channel(fifo->rx_chan);
 
     fifo->tx_chan = NULL;
     fifo->rx_chan = NULL;
 }
 
 static void usbhsf_dma_init_pdev(struct usbhs_fifo *fifo)
 {
     dma_cap_mask_t mask;
 
     dma_cap_zero(mask);
     dma_cap_set(DMA_SLAVE, mask);
     fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
                         &fifo->tx_slave);
 
     dma_cap_zero(mask);
     dma_cap_set(DMA_SLAVE, mask);
     fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
                         &fifo->rx_slave);
 }
 
 static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
                    int channel)
 {
     char name[16];
 
     /*
      * To avoid complex handing for DnFIFOs, the driver uses each
      * DnFIFO as TX or RX direction (not bi-direction).
      * So, the driver uses odd channels for TX, even channels for RX.
      */
     snprintf(name, sizeof(name), "ch%d", channel);
     if (channel & 1) {
         fifo->tx_chan = dma_request_chan(dev, name);
         if (IS_ERR(fifo->tx_chan))
             fifo->tx_chan = NULL;
     } else {
         fifo->rx_chan = dma_request_chan(dev, name);
         if (IS_ERR(fifo->rx_chan))
             fifo->rx_chan = NULL;
     }
 }
 
 static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo,
                 int channel)
 {
     struct device *dev = usbhs_priv_to_dev(priv);
 
     if (dev_of_node(dev))
         usbhsf_dma_init_dt(dev, fifo, channel);
     else
         usbhsf_dma_init_pdev(fifo);
 
     if (fifo->tx_chan || fifo->rx_chan)
         dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
              fifo->name,
              fifo->tx_chan ? "[TX]" : "    ",
              fifo->rx_chan ? "[RX]" : "    ");
 }
 
 /*
  *      irq functions
  */
 static int usbhsf_irq_empty(struct usbhs_priv *priv,
                 struct usbhs_irq_state *irq_state)
 {
     struct usbhs_pipe *pipe;
     struct device *dev = usbhs_priv_to_dev(priv);
     int i, ret;
 
     if (!irq_state->bempsts) {
         dev_err(dev, "debug %s !!\n", __func__);
         return -EIO;
     }
 
     dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
 
     /*
      * search interrupted "pipe"
      * not "uep".
      */
     usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
         if (!(irq_state->bempsts & (1 << i)))
             continue;
 
         ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
         if (ret < 0)
             dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
     }
 
     return 0;
 }
 
 static int usbhsf_irq_ready(struct usbhs_priv *priv,
                 struct usbhs_irq_state *irq_state)
 {
     struct usbhs_pipe *pipe;
     struct device *dev = usbhs_priv_to_dev(priv);
     int i, ret;
 
     if (!irq_state->brdysts) {
         dev_err(dev, "debug %s !!\n", __func__);
         return -EIO;
     }
 
     dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
 
     /*
      * search interrupted "pipe"
      * not "uep".
      */
     usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
         if (!(irq_state->brdysts & (1 << i)))
             continue;
 
         ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
         if (ret < 0)
             dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
     }
 
     return 0;
 }
 
 static void usbhsf_dma_complete(void *arg,
                 const struct dmaengine_result *result)
 {
     struct usbhs_pkt *pkt = arg;
     struct usbhs_pipe *pipe = pkt->pipe;
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct device *dev = usbhs_priv_to_dev(priv);
     int ret;
 
     pkt->dma_result = result;
     ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
     if (ret < 0)
         dev_err(dev, "dma_complete run_error %d : %d\n",
             usbhs_pipe_number(pipe), ret);
 }
 
 void usbhs_fifo_clear_dcp(struct usbhs_pipe *pipe)
 {
     struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
     struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 
     /* clear DCP FIFO of transmission */
     if (usbhsf_fifo_select(pipe, fifo, 1) < 0)
         return;
     usbhsf_fifo_clear(pipe, fifo);
     usbhsf_fifo_unselect(pipe, fifo);
 
     /* clear DCP FIFO of reception */
     if (usbhsf_fifo_select(pipe, fifo, 0) < 0)
         return;
     usbhsf_fifo_clear(pipe, fifo);
     usbhsf_fifo_unselect(pipe, fifo);
 }
 
 /*
  *      fifo init
  */
 void usbhs_fifo_init(struct usbhs_priv *priv)
 {
     struct usbhs_mod *mod = usbhs_mod_get_current(priv);
     struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
     struct usbhs_fifo *dfifo;
     int i;
 
     mod->irq_empty      = usbhsf_irq_empty;
     mod->irq_ready      = usbhsf_irq_ready;
     mod->irq_bempsts    = 0;
     mod->irq_brdysts    = 0;
 
     cfifo->pipe = NULL;
     usbhs_for_each_dfifo(priv, dfifo, i)
         dfifo->pipe = NULL;
 }
 
 void usbhs_fifo_quit(struct usbhs_priv *priv)
 {
     struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 
     mod->irq_empty      = NULL;
     mod->irq_ready      = NULL;
     mod->irq_bempsts    = 0;
     mod->irq_brdysts    = 0;
 }
 
 #define __USBHS_DFIFO_INIT(priv, fifo, channel, fifo_port)      \
 do {                                    \
     fifo = usbhsf_get_dnfifo(priv, channel);            \
     fifo->name  = "D"#channel"FIFO";                \
     fifo->port  = fifo_port;                    \
     fifo->sel   = D##channel##FIFOSEL;              \
     fifo->ctr   = D##channel##FIFOCTR;              \
     fifo->tx_slave.shdma_slave.slave_id =               \
             usbhs_get_dparam(priv, d##channel##_tx_id); \
     fifo->rx_slave.shdma_slave.slave_id =               \
             usbhs_get_dparam(priv, d##channel##_rx_id); \
     usbhsf_dma_init(priv, fifo, channel);               \
 } while (0)
 
 #define USBHS_DFIFO_INIT(priv, fifo, channel)               \
         __USBHS_DFIFO_INIT(priv, fifo, channel, D##channel##FIFO)
 #define USBHS_DFIFO_INIT_NO_PORT(priv, fifo, channel)           \
         __USBHS_DFIFO_INIT(priv, fifo, channel, 0)
 
 int usbhs_fifo_probe(struct usbhs_priv *priv)
 {
     struct usbhs_fifo *fifo;
 
     /* CFIFO */
     fifo = usbhsf_get_cfifo(priv);
     fifo->name  = "CFIFO";
     fifo->port  = CFIFO;
     fifo->sel   = CFIFOSEL;
     fifo->ctr   = CFIFOCTR;
 
     /* DFIFO */
     USBHS_DFIFO_INIT(priv, fifo, 0);
     USBHS_DFIFO_INIT(priv, fifo, 1);
     USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 2);
     USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 3);
 
     return 0;
 }
 
 void usbhs_fifo_remove(struct usbhs_priv *priv)
 {
     struct usbhs_fifo *fifo;
     int i;
 
     usbhs_for_each_dfifo(priv, fifo, i)
         usbhsf_dma_quit(priv, fifo);
 }

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