fifo.c 26.6 KB
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/*
 * Renesas USB driver
 *
 * Copyright (C) 2011 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */
#include <linux/delay.h>
#include <linux/io.h>
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#include <linux/scatterlist.h>
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#include "common.h"
#include "pipe.h"
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#define usbhsf_get_cfifo(p)	(&((p)->fifo_info.cfifo))
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#define usbhsf_get_d0fifo(p)	(&((p)->fifo_info.d0fifo))
#define usbhsf_get_d1fifo(p)	(&((p)->fifo_info.d1fifo))
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#define usbhsf_is_cfifo(p, f)	(usbhsf_get_cfifo(p) == f)
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#define usbhsf_fifo_is_busy(f)	((f)->pipe) /* see usbhs_pipe_select_fifo */

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/*
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 *		packet initialize
 */
void usbhs_pkt_init(struct usbhs_pkt *pkt)
{
	INIT_LIST_HEAD(&pkt->node);
}

/*
 *		packet control function
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 */
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static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
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{
	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 struct usbhs_pkt_handle usbhsf_null_handler = {
	.prepare = usbhsf_null_handle,
	.try_run = usbhsf_null_handle,
};

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void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
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		    void (*done)(struct usbhs_priv *priv,
				 struct usbhs_pkt *pkt),
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		    void *buf, int len, int zero, int sequence)
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{
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	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct device *dev = usbhs_priv_to_dev(priv);
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	unsigned long flags;

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	if (!done) {
		dev_err(dev, "no done function\n");
		return;
	}

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	/********************  spin lock ********************/
	usbhs_lock(priv, flags);

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	if (!pipe->handler) {
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		dev_err(dev, "no handler function\n");
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		pipe->handler = &usbhsf_null_handler;
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	}

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	list_move_tail(&pkt->node, &pipe->list);
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	/*
	 * each pkt must hold own handler.
	 * because handler might be changed by its situation.
	 * dma handler -> pio handler.
	 */
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	pkt->pipe	= pipe;
	pkt->buf	= buf;
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	pkt->handler	= pipe->handler;
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	pkt->length	= len;
	pkt->zero	= zero;
	pkt->actual	= 0;
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	pkt->done	= done;
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	pkt->sequence	= sequence;
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	usbhs_unlock(priv, flags);
	/********************  spin unlock ******************/
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}

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static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
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{
	list_del_init(&pkt->node);
}

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static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
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{
	if (list_empty(&pipe->list))
		return NULL;

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	return list_first_entry(&pipe->list, struct usbhs_pkt, node);
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}

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struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	unsigned long flags;

	/********************  spin lock ********************/
	usbhs_lock(priv, flags);

	if (!pkt)
		pkt = __usbhsf_pkt_get(pipe);

	if (pkt)
		__usbhsf_pkt_del(pkt);

	usbhs_unlock(priv, flags);
	/********************  spin unlock ******************/

	return pkt;
}

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enum {
	USBHSF_PKT_PREPARE,
	USBHSF_PKT_TRY_RUN,
	USBHSF_PKT_DMA_DONE,
};

static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
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{
	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)
		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;
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	case USBHSF_PKT_DMA_DONE:
		func = pkt->handler->dma_done;
		break;
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	default:
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		dev_err(dev, "unknown pkt handler\n");
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		goto __usbhs_pkt_handler_end;
	}

	ret = func(pkt, &is_done);

	if (is_done)
		__usbhsf_pkt_del(pkt);

__usbhs_pkt_handler_end:
	usbhs_unlock(priv, flags);
	/********************  spin unlock ******************/

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	if (is_done) {
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		pkt->done(priv, pkt);
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		usbhs_pkt_start(pipe);
	}
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	return ret;
}

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void usbhs_pkt_start(struct usbhs_pipe *pipe)
{
	usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
}

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/*
 *		irq enable/disable function
 */
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#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)
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#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)						\
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			mod->status |= status;				\
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		else							\
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			mod->status &= ~status;				\
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		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);
}

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/*
 *		FIFO ctrl
 */
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static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
				   struct usbhs_fifo *fifo)
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{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);

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	usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
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}

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static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
			       struct usbhs_fifo *fifo)
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{
	int timeout = 1024;

	do {
		/* The FIFO port is accessible */
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		if (usbhs_read(priv, fifo->ctr) & FRDY)
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			return 0;

		udelay(10);
	} while (timeout--);

	return -EBUSY;
}

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static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
			      struct usbhs_fifo *fifo)
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{
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);

	if (!usbhs_pipe_is_dcp(pipe))
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		usbhsf_fifo_barrier(priv, fifo);
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	usbhs_write(priv, fifo->ctr, BCLR);
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}

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static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
			       struct usbhs_fifo *fifo)
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{
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	return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
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}

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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);
}

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static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
			      struct usbhs_fifo *fifo,
			      int write)
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{
	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 */

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	if (usbhs_pipe_is_busy(pipe) ||
	    usbhsf_fifo_is_busy(fifo))
		return -EBUSY;

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	if (usbhs_pipe_is_dcp(pipe)) {
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		base |= (1 == write) << 5;	/* ISEL */

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		if (usbhs_mod_is_host(priv))
			usbhs_dcp_dir_for_host(pipe, write);
	}

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	/* "base" will be used below  */
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	if (usbhs_get_dparam(priv, has_sudmac) && !usbhsf_is_cfifo(priv, fifo))
		usbhs_write(priv, fifo->sel, base);
	else
		usbhs_write(priv, fifo->sel, base | MBW_32);
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	/* check ISEL and CURPIPE value */
	while (timeout--) {
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		if (base == (mask & usbhs_read(priv, fifo->sel))) {
			usbhs_pipe_select_fifo(pipe, fifo);
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			return 0;
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		}
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		udelay(10);
	}

	dev_err(dev, "fifo select error\n");

	return -EIO;
}

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/*
 *		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() faile\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;
}

struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
	.prepare = usbhs_dcp_dir_switch_to_write,
	.try_run = usbhs_dcp_dir_switch_done,
};

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);
}

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);
}

struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
	.prepare = usbhsf_dcp_data_stage_prepare_pop,
};

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/*
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 *		PIO push handler
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 */
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static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
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{
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	struct usbhs_pipe *pipe = pkt->pipe;
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	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
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	struct device *dev = usbhs_priv_to_dev(priv);
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	struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
	void __iomem *addr = priv->base + fifo->port;
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	u8 *buf;
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	int maxp = usbhs_pipe_get_maxpacket(pipe);
	int total_len;
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	int i, ret, len;
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	int is_short;
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	usbhs_pipe_data_sequence(pipe, pkt->sequence);
	pkt->sequence = -1; /* -1 sequence will be ignored */

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	usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);

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	ret = usbhsf_fifo_select(pipe, fifo, 1);
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	if (ret < 0)
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		return 0;
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	ret = usbhs_pipe_is_accessible(pipe);
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	if (ret < 0) {
		/* inaccessible pipe is not an error */
		ret = 0;
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		goto usbhs_fifo_write_busy;
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	}
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	ret = usbhsf_fifo_barrier(priv, fifo);
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	if (ret < 0)
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		goto usbhs_fifo_write_busy;
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	buf		= pkt->buf    + pkt->actual;
	len		= pkt->length - pkt->actual;
	len		= min(len, maxp);
	total_len	= len;
	is_short	= total_len < maxp;
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	/*
	 * FIXME
	 *
	 * 32-bit access only
	 */
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	if (len >= 4 && !((unsigned long)buf & 0x03)) {
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		iowrite32_rep(addr, buf, len / 4);
		len %= 4;
		buf += total_len - len;
	}

	/* the rest operation */
	for (i = 0; i < len; i++)
		iowrite8(buf[i], addr + (0x03 - (i & 0x03)));

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	/*
	 * variable update
	 */
	pkt->actual += total_len;

	if (pkt->actual < pkt->length)
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		*is_done = 0;		/* there are remainder data */
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	else if (is_short)
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		*is_done = 1;		/* short packet */
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	else
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		*is_done = !pkt->zero;	/* send zero packet ? */
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	/*
	 * pipe/irq handling
	 */
	if (is_short)
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		usbhsf_send_terminator(pipe, fifo);
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	usbhsf_tx_irq_ctrl(pipe, !*is_done);
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	usbhs_pipe_enable(pipe);

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	dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
		usbhs_pipe_number(pipe),
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		pkt->length, pkt->actual, *is_done, pkt->zero);
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	/*
	 * Transmission end
	 */
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	if (*is_done) {
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		if (usbhs_pipe_is_dcp(pipe))
			usbhs_dcp_control_transfer_done(pipe);
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	}

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	usbhsf_fifo_unselect(pipe, fifo);

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	return 0;
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usbhs_fifo_write_busy:
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	usbhsf_fifo_unselect(pipe, fifo);

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	/*
	 * pipe is busy.
	 * retry in interrupt
	 */
	usbhsf_tx_irq_ctrl(pipe, 1);

	return ret;
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}

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struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
	.prepare = usbhsf_pio_try_push,
	.try_run = usbhsf_pio_try_push,
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};

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/*
 *		PIO pop handler
 */
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static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
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{
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	struct usbhs_pipe *pipe = pkt->pipe;
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	if (usbhs_pipe_is_busy(pipe))
		return 0;
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	/*
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	 * pipe enable to prepare packet receive
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	 */
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	usbhs_pipe_data_sequence(pipe, pkt->sequence);
	pkt->sequence = -1; /* -1 sequence will be ignored */
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	usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
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	usbhs_pipe_enable(pipe);
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	usbhsf_rx_irq_ctrl(pipe, 1);
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	return 0;
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}

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static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
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{
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	struct usbhs_pipe *pipe = pkt->pipe;
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	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
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	struct device *dev = usbhs_priv_to_dev(priv);
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	struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
	void __iomem *addr = priv->base + fifo->port;
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	u8 *buf;
	u32 data = 0;
	int maxp = usbhs_pipe_get_maxpacket(pipe);
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	int rcv_len, len;
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	int i, ret;
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	int total_len = 0;
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	ret = usbhsf_fifo_select(pipe, fifo, 0);
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	if (ret < 0)
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		return 0;
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	ret = usbhsf_fifo_barrier(priv, fifo);
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	if (ret < 0)
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		goto usbhs_fifo_read_busy;
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	rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
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	buf		= pkt->buf    + pkt->actual;
	len		= pkt->length - pkt->actual;
	len		= min(len, rcv_len);
	total_len	= len;

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	/*
	 * 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_disable(pipe);	/* disable pipe first */
	}

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	/*
	 * Buffer clear if Zero-Length packet
	 *
	 * see
	 * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
	 */
	if (0 == rcv_len) {
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		pkt->zero = 1;
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		usbhsf_fifo_clear(pipe, fifo);
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		goto usbhs_fifo_read_end;
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	}

	/*
	 * FIXME
	 *
	 * 32-bit access only
	 */
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	if (len >= 4 && !((unsigned long)buf & 0x03)) {
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		ioread32_rep(addr, buf, len / 4);
		len %= 4;
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		buf += total_len - len;
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	}

	/* the rest operation */
	for (i = 0; i < len; i++) {
		if (!(i & 0x03))
			data = ioread32(addr);

		buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
	}

679
usbhs_fifo_read_end:
680 681 682 683
	dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
		usbhs_pipe_number(pipe),
		pkt->length, pkt->actual, *is_done, pkt->zero);

684 685 686 687
usbhs_fifo_read_busy:
	usbhsf_fifo_unselect(pipe, fifo);

	return ret;
688
}
689

690
struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
691
	.prepare = usbhsf_prepare_pop,
692
	.try_run = usbhsf_pio_try_pop,
693 694 695
};

/*
696
 *		DCP ctrol statge handler
697
 */
698
static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
699
{
700
	usbhs_dcp_control_transfer_done(pkt->pipe);
701

702
	*is_done = 1;
703 704 705 706 707 708 709 710 711

	return 0;
}

struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
	.prepare = usbhsf_ctrl_stage_end,
	.try_run = usbhsf_ctrl_stage_end,
};

712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769
/*
 *		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;

	/* DMA :: D0FIFO */
	fifo = usbhsf_get_d0fifo(priv);
	if (usbhsf_dma_chan_get(fifo, pkt) &&
	    !usbhsf_fifo_is_busy(fifo))
		return fifo;

	/* DMA :: D1FIFO */
	fifo = usbhsf_get_d1fifo(priv);
	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);
}

#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)
{
	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);

	return info->dma_map_ctrl(pkt, map);
}

static void usbhsf_dma_complete(void *arg);
770
static void xfer_work(struct work_struct *work)
771
{
772
	struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
773 774 775 776 777 778
	struct usbhs_pipe *pipe = pkt->pipe;
	struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct dma_async_tx_descriptor *desc;
	struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
	struct device *dev = usbhs_priv_to_dev(priv);
779
	enum dma_transfer_direction dir;
780

781
	dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
782

783 784
	desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
					pkt->trans, dir,
785
					DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
786 787 788 789 790 791
	if (!desc)
		return;

	desc->callback		= usbhsf_dma_complete;
	desc->callback_param	= pipe;

792
	if (dmaengine_submit(desc) < 0) {
793 794 795 796 797 798 799
		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);

800
	usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
801
	usbhs_pipe_enable(pipe);
802 803 804 805
	usbhsf_dma_start(pipe, fifo);
	dma_async_issue_pending(chan);
}

806 807 808
/*
 *		DMA push handler
 */
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
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;

	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_is_dcp(pipe))
		goto usbhsf_pio_prepare_push;

825
	if (len & 0x7) /* 8byte alignment */
826 827
		goto usbhsf_pio_prepare_push;

828
	if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
829 830
		goto usbhsf_pio_prepare_push;

831 832 833 834 835 836 837 838 839 840 841 842 843 844
	/* get enable DMA fifo */
	fifo = usbhsf_get_dma_fifo(priv, pkt);
	if (!fifo)
		goto usbhsf_pio_prepare_push;

	if (usbhsf_dma_map(pkt) < 0)
		goto usbhsf_pio_prepare_push;

	ret = usbhsf_fifo_select(pipe, fifo, 0);
	if (ret < 0)
		goto usbhsf_pio_prepare_push_unmap;

	pkt->trans = len;

845 846
	INIT_WORK(&pkt->work, xfer_work);
	schedule_work(&pkt->work);
847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880

	return 0;

usbhsf_pio_prepare_push_unmap:
	usbhsf_dma_unmap(pkt);
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;

	pkt->actual = pkt->trans;

	*is_done = !pkt->zero;	/* send zero packet ? */

	usbhsf_dma_stop(pipe, pipe->fifo);
	usbhsf_dma_unmap(pkt);
	usbhsf_fifo_unselect(pipe, pipe->fifo);

	return 0;
}

struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
	.prepare	= usbhsf_dma_prepare_push,
	.dma_done	= usbhsf_dma_push_done,
};

881 882 883
/*
 *		DMA pop handler
 */
884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901
static int usbhsf_dma_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 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;

902
	if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
903 904
		goto usbhsf_pio_prepare_pop;

905 906 907 908 909 910 911
	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);
912
	if (len & 0x7) /* 8byte alignment */
913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935
		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;

936 937
	INIT_WORK(&pkt->work, xfer_work);
	schedule_work(&pkt->work);
938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992

	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_pop_done(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;
	} else {
		/* re-enable */
		usbhsf_prepare_pop(pkt, is_done);
	}

	return 0;
}

struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
	.prepare	= usbhsf_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
	 */
993
	if (0 == slave->shdma_slave.slave_id)
994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028
		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(struct usbhs_priv *priv,
			    struct usbhs_fifo *fifo)
{
	struct device *dev = usbhs_priv_to_dev(priv);
	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);

	if (fifo->tx_chan || fifo->rx_chan)
1029
		dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1030 1031 1032 1033 1034
			 fifo->name,
			 fifo->tx_chan ? "[TX]" : "    ",
			 fifo->rx_chan ? "[RX]" : "    ");
}

1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
/*
 *		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;

1060
		ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
		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;

1090
		ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1091 1092 1093 1094 1095 1096 1097
		if (ret < 0)
			dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
	}

	return 0;
}

1098 1099 1100 1101 1102 1103 1104
static void usbhsf_dma_complete(void *arg)
{
	struct usbhs_pipe *pipe = arg;
	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
	struct device *dev = usbhs_priv_to_dev(priv);
	int ret;

1105
	ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1106 1107 1108 1109 1110
	if (ret < 0)
		dev_err(dev, "dma_complete run_error %d : %d\n",
			usbhs_pipe_number(pipe), ret);
}

1111 1112 1113 1114 1115 1116
/*
 *		fifo init
 */
void usbhs_fifo_init(struct usbhs_priv *priv)
{
	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1117
	struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1118 1119
	struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv);
	struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv);
1120 1121 1122 1123 1124

	mod->irq_empty		= usbhsf_irq_empty;
	mod->irq_ready		= usbhsf_irq_ready;
	mod->irq_bempsts	= 0;
	mod->irq_brdysts	= 0;
1125 1126

	cfifo->pipe	= NULL;
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139
	cfifo->tx_chan	= NULL;
	cfifo->rx_chan	= NULL;

	d0fifo->pipe	= NULL;
	d0fifo->tx_chan	= NULL;
	d0fifo->rx_chan	= NULL;

	d1fifo->pipe	= NULL;
	d1fifo->tx_chan	= NULL;
	d1fifo->rx_chan	= NULL;

	usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv));
	usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv));
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149
}

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;
1150 1151 1152

	usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv));
	usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv));
1153
}
1154 1155 1156 1157 1158 1159 1160

int usbhs_fifo_probe(struct usbhs_priv *priv)
{
	struct usbhs_fifo *fifo;

	/* CFIFO */
	fifo = usbhsf_get_cfifo(priv);
1161
	fifo->name	= "CFIFO";
1162 1163 1164 1165
	fifo->port	= CFIFO;
	fifo->sel	= CFIFOSEL;
	fifo->ctr	= CFIFOCTR;

1166 1167 1168 1169 1170 1171
	/* D0FIFO */
	fifo = usbhsf_get_d0fifo(priv);
	fifo->name	= "D0FIFO";
	fifo->port	= D0FIFO;
	fifo->sel	= D0FIFOSEL;
	fifo->ctr	= D0FIFOCTR;
1172 1173
	fifo->tx_slave.shdma_slave.slave_id	= usbhs_get_dparam(priv, d0_tx_id);
	fifo->rx_slave.shdma_slave.slave_id	= usbhs_get_dparam(priv, d0_rx_id);
1174 1175 1176 1177 1178 1179 1180

	/* D1FIFO */
	fifo = usbhsf_get_d1fifo(priv);
	fifo->name	= "D1FIFO";
	fifo->port	= D1FIFO;
	fifo->sel	= D1FIFOSEL;
	fifo->ctr	= D1FIFOCTR;
1181 1182
	fifo->tx_slave.shdma_slave.slave_id	= usbhs_get_dparam(priv, d1_tx_id);
	fifo->rx_slave.shdma_slave.slave_id	= usbhs_get_dparam(priv, d1_rx_id);
1183

1184 1185 1186 1187 1188 1189
	return 0;
}

void usbhs_fifo_remove(struct usbhs_priv *priv)
{
}