drivers/soc/fsl/qe/ucc_fast.c - kernel/quantenna - Git at Google

 /*
  * Copyright (C) 2006 Freescale Semiconductor, Inc. All rights reserved.
  *
  * Authors: 	Shlomi Gridish <gridish@freescale.com>
  * 		Li Yang <leoli@freescale.com>
  *
  * Description:
  * QE UCC Fast API Set - UCC Fast specific routines implementations.
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
  */
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/stddef.h>
 #include <linux/interrupt.h>
 #include <linux/err.h>
 #include <linux/export.h>

 #include <asm/io.h>
 #include <soc/fsl/qe/immap_qe.h>
 #include <soc/fsl/qe/qe.h>

 #include <soc/fsl/qe/ucc.h>
 #include <soc/fsl/qe/ucc_fast.h>

 void ucc_fast_dump_regs(struct ucc_fast_private * uccf)
 {
 	printk(KERN_INFO "UCC%u Fast registers:\n", uccf->uf_info->ucc_num);
 	printk(KERN_INFO "Base address: 0x%p\n", uccf->uf_regs);

 	printk(KERN_INFO "gumr  : addr=0x%p, val=0x%08x\n",
 		  &uccf->uf_regs->gumr, in_be32(&uccf->uf_regs->gumr));
 	printk(KERN_INFO "upsmr : addr=0x%p, val=0x%08x\n",
 		  &uccf->uf_regs->upsmr, in_be32(&uccf->uf_regs->upsmr));
 	printk(KERN_INFO "utodr : addr=0x%p, val=0x%04x\n",
 		  &uccf->uf_regs->utodr, in_be16(&uccf->uf_regs->utodr));
 	printk(KERN_INFO "udsr  : addr=0x%p, val=0x%04x\n",
 		  &uccf->uf_regs->udsr, in_be16(&uccf->uf_regs->udsr));
 	printk(KERN_INFO "ucce  : addr=0x%p, val=0x%08x\n",
 		  &uccf->uf_regs->ucce, in_be32(&uccf->uf_regs->ucce));
 	printk(KERN_INFO "uccm  : addr=0x%p, val=0x%08x\n",
 		  &uccf->uf_regs->uccm, in_be32(&uccf->uf_regs->uccm));
 	printk(KERN_INFO "uccs  : addr=0x%p, val=0x%02x\n",
 		  &uccf->uf_regs->uccs, in_8(&uccf->uf_regs->uccs));
 	printk(KERN_INFO "urfb  : addr=0x%p, val=0x%08x\n",
 		  &uccf->uf_regs->urfb, in_be32(&uccf->uf_regs->urfb));
 	printk(KERN_INFO "urfs  : addr=0x%p, val=0x%04x\n",
 		  &uccf->uf_regs->urfs, in_be16(&uccf->uf_regs->urfs));
 	printk(KERN_INFO "urfet : addr=0x%p, val=0x%04x\n",
 		  &uccf->uf_regs->urfet, in_be16(&uccf->uf_regs->urfet));
 	printk(KERN_INFO "urfset: addr=0x%p, val=0x%04x\n",
 		  &uccf->uf_regs->urfset, in_be16(&uccf->uf_regs->urfset));
 	printk(KERN_INFO "utfb  : addr=0x%p, val=0x%08x\n",
 		  &uccf->uf_regs->utfb, in_be32(&uccf->uf_regs->utfb));
 	printk(KERN_INFO "utfs  : addr=0x%p, val=0x%04x\n",
 		  &uccf->uf_regs->utfs, in_be16(&uccf->uf_regs->utfs));
 	printk(KERN_INFO "utfet : addr=0x%p, val=0x%04x\n",
 		  &uccf->uf_regs->utfet, in_be16(&uccf->uf_regs->utfet));
 	printk(KERN_INFO "utftt : addr=0x%p, val=0x%04x\n",
 		  &uccf->uf_regs->utftt, in_be16(&uccf->uf_regs->utftt));
 	printk(KERN_INFO "utpt  : addr=0x%p, val=0x%04x\n",
 		  &uccf->uf_regs->utpt, in_be16(&uccf->uf_regs->utpt));
 	printk(KERN_INFO "urtry : addr=0x%p, val=0x%08x\n",
 		  &uccf->uf_regs->urtry, in_be32(&uccf->uf_regs->urtry));
 	printk(KERN_INFO "guemr : addr=0x%p, val=0x%02x\n",
 		  &uccf->uf_regs->guemr, in_8(&uccf->uf_regs->guemr));
 }
 EXPORT_SYMBOL(ucc_fast_dump_regs);

 u32 ucc_fast_get_qe_cr_subblock(int uccf_num)
 {
 	switch (uccf_num) {
 	case 0: return QE_CR_SUBBLOCK_UCCFAST1;
 	case 1: return QE_CR_SUBBLOCK_UCCFAST2;
 	case 2: return QE_CR_SUBBLOCK_UCCFAST3;
 	case 3: return QE_CR_SUBBLOCK_UCCFAST4;
 	case 4: return QE_CR_SUBBLOCK_UCCFAST5;
 	case 5: return QE_CR_SUBBLOCK_UCCFAST6;
 	case 6: return QE_CR_SUBBLOCK_UCCFAST7;
 	case 7: return QE_CR_SUBBLOCK_UCCFAST8;
 	default: return QE_CR_SUBBLOCK_INVALID;
 	}
 }
 EXPORT_SYMBOL(ucc_fast_get_qe_cr_subblock);

 void ucc_fast_transmit_on_demand(struct ucc_fast_private * uccf)
 {
 	out_be16(&uccf->uf_regs->utodr, UCC_FAST_TOD);
 }
 EXPORT_SYMBOL(ucc_fast_transmit_on_demand);

 void ucc_fast_enable(struct ucc_fast_private * uccf, enum comm_dir mode)
 {
 	struct ucc_fast __iomem *uf_regs;
 	u32 gumr;

 	uf_regs = uccf->uf_regs;

 	/* Enable reception and/or transmission on this UCC. */
 	gumr = in_be32(&uf_regs->gumr);
 	if (mode & COMM_DIR_TX) {
 		gumr |= UCC_FAST_GUMR_ENT;
 		uccf->enabled_tx = 1;
 	}
 	if (mode & COMM_DIR_RX) {
 		gumr |= UCC_FAST_GUMR_ENR;
 		uccf->enabled_rx = 1;
 	}
 	out_be32(&uf_regs->gumr, gumr);
 }
 EXPORT_SYMBOL(ucc_fast_enable);

 void ucc_fast_disable(struct ucc_fast_private * uccf, enum comm_dir mode)
 {
 	struct ucc_fast __iomem *uf_regs;
 	u32 gumr;

 	uf_regs = uccf->uf_regs;

 	/* Disable reception and/or transmission on this UCC. */
 	gumr = in_be32(&uf_regs->gumr);
 	if (mode & COMM_DIR_TX) {
 		gumr &= ~UCC_FAST_GUMR_ENT;
 		uccf->enabled_tx = 0;
 	}
 	if (mode & COMM_DIR_RX) {
 		gumr &= ~UCC_FAST_GUMR_ENR;
 		uccf->enabled_rx = 0;
 	}
 	out_be32(&uf_regs->gumr, gumr);
 }
 EXPORT_SYMBOL(ucc_fast_disable);

 int ucc_fast_init(struct ucc_fast_info * uf_info, struct ucc_fast_private ** uccf_ret)
 {
 	struct ucc_fast_private *uccf;
 	struct ucc_fast __iomem *uf_regs;
 	u32 gumr;
 	int ret;

 	if (!uf_info)
 		return -EINVAL;

 	/* check if the UCC port number is in range. */
 	if ((uf_info->ucc_num < 0) || (uf_info->ucc_num > UCC_MAX_NUM - 1)) {
 		printk(KERN_ERR "%s: illegal UCC number\n", __func__);
 		return -EINVAL;
 	}

 	/* Check that 'max_rx_buf_length' is properly aligned (4). */
 	if (uf_info->max_rx_buf_length & (UCC_FAST_MRBLR_ALIGNMENT - 1)) {
 		printk(KERN_ERR "%s: max_rx_buf_length not aligned\n",
 			__func__);
 		return -EINVAL;
 	}

 	/* Validate Virtual Fifo register values */
 	if (uf_info->urfs < UCC_FAST_URFS_MIN_VAL) {
 		printk(KERN_ERR "%s: urfs is too small\n", __func__);
 		return -EINVAL;
 	}

 	if (uf_info->urfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 		printk(KERN_ERR "%s: urfs is not aligned\n", __func__);
 		return -EINVAL;
 	}

 	if (uf_info->urfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 		printk(KERN_ERR "%s: urfet is not aligned.\n", __func__);
 		return -EINVAL;
 	}

 	if (uf_info->urfset & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 		printk(KERN_ERR "%s: urfset is not aligned\n", __func__);
 		return -EINVAL;
 	}

 	if (uf_info->utfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 		printk(KERN_ERR "%s: utfs is not aligned\n", __func__);
 		return -EINVAL;
 	}

 	if (uf_info->utfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 		printk(KERN_ERR "%s: utfet is not aligned\n", __func__);
 		return -EINVAL;
 	}

 	if (uf_info->utftt & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
 		printk(KERN_ERR "%s: utftt is not aligned\n", __func__);
 		return -EINVAL;
 	}

 	uccf = kzalloc(sizeof(struct ucc_fast_private), GFP_KERNEL);
 	if (!uccf) {
 		printk(KERN_ERR "%s: Cannot allocate private data\n",
 			__func__);
 		return -ENOMEM;
 	}

 	/* Fill fast UCC structure */
 	uccf->uf_info = uf_info;
 	/* Set the PHY base address */
 	uccf->uf_regs = ioremap(uf_info->regs, sizeof(struct ucc_fast));
 	if (uccf->uf_regs == NULL) {
 		printk(KERN_ERR "%s: Cannot map UCC registers\n", __func__);
 		kfree(uccf);
 		return -ENOMEM;
 	}

 	uccf->enabled_tx = 0;
 	uccf->enabled_rx = 0;
 	uccf->stopped_tx = 0;
 	uccf->stopped_rx = 0;
 	uf_regs = uccf->uf_regs;
 	uccf->p_ucce = &uf_regs->ucce;
 	uccf->p_uccm = &uf_regs->uccm;
 #ifdef CONFIG_UGETH_TX_ON_DEMAND
 	uccf->p_utodr = &uf_regs->utodr;
 #endif
 #ifdef STATISTICS
 	uccf->tx_frames = 0;
 	uccf->rx_frames = 0;
 	uccf->rx_discarded = 0;
 #endif				/* STATISTICS */

 	/* Set UCC to fast type */
 	ret = ucc_set_type(uf_info->ucc_num, UCC_SPEED_TYPE_FAST);
 	if (ret) {
 		printk(KERN_ERR "%s: cannot set UCC type\n", __func__);
 		ucc_fast_free(uccf);
 		return ret;
 	}

 	uccf->mrblr = uf_info->max_rx_buf_length;

 	/* Set GUMR */
 	/* For more details see the hardware spec. */
 	gumr = uf_info->ttx_trx;
 	if (uf_info->tci)
 		gumr |= UCC_FAST_GUMR_TCI;
 	if (uf_info->cdp)
 		gumr |= UCC_FAST_GUMR_CDP;
 	if (uf_info->ctsp)
 		gumr |= UCC_FAST_GUMR_CTSP;
 	if (uf_info->cds)
 		gumr |= UCC_FAST_GUMR_CDS;
 	if (uf_info->ctss)
 		gumr |= UCC_FAST_GUMR_CTSS;
 	if (uf_info->txsy)
 		gumr |= UCC_FAST_GUMR_TXSY;
 	if (uf_info->rsyn)
 		gumr |= UCC_FAST_GUMR_RSYN;
 	gumr |= uf_info->synl;
 	if (uf_info->rtsm)
 		gumr |= UCC_FAST_GUMR_RTSM;
 	gumr |= uf_info->renc;
 	if (uf_info->revd)
 		gumr |= UCC_FAST_GUMR_REVD;
 	gumr |= uf_info->tenc;
 	gumr |= uf_info->tcrc;
 	gumr |= uf_info->mode;
 	out_be32(&uf_regs->gumr, gumr);

 	/* Allocate memory for Tx Virtual Fifo */
 	uccf->ucc_fast_tx_virtual_fifo_base_offset =
 	    qe_muram_alloc(uf_info->utfs, UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
 	if (IS_ERR_VALUE(uccf->ucc_fast_tx_virtual_fifo_base_offset)) {
 		printk(KERN_ERR "%s: cannot allocate MURAM for TX FIFO\n",
 			__func__);
 		uccf->ucc_fast_tx_virtual_fifo_base_offset = 0;
 		ucc_fast_free(uccf);
 		return -ENOMEM;
 	}

 	/* Allocate memory for Rx Virtual Fifo */
 	uccf->ucc_fast_rx_virtual_fifo_base_offset =
 		qe_muram_alloc(uf_info->urfs +
 			   UCC_FAST_RECEIVE_VIRTUAL_FIFO_SIZE_FUDGE_FACTOR,
 			   UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
 	if (IS_ERR_VALUE(uccf->ucc_fast_rx_virtual_fifo_base_offset)) {
 		printk(KERN_ERR "%s: cannot allocate MURAM for RX FIFO\n",
 			__func__);
 		uccf->ucc_fast_rx_virtual_fifo_base_offset = 0;
 		ucc_fast_free(uccf);
 		return -ENOMEM;
 	}

 	/* Set Virtual Fifo registers */
 	out_be16(&uf_regs->urfs, uf_info->urfs);
 	out_be16(&uf_regs->urfet, uf_info->urfet);
 	out_be16(&uf_regs->urfset, uf_info->urfset);
 	out_be16(&uf_regs->utfs, uf_info->utfs);
 	out_be16(&uf_regs->utfet, uf_info->utfet);
 	out_be16(&uf_regs->utftt, uf_info->utftt);
 	/* utfb, urfb are offsets from MURAM base */
 	out_be32(&uf_regs->utfb, uccf->ucc_fast_tx_virtual_fifo_base_offset);
 	out_be32(&uf_regs->urfb, uccf->ucc_fast_rx_virtual_fifo_base_offset);

 	/* Mux clocking */
 	/* Grant Support */
 	ucc_set_qe_mux_grant(uf_info->ucc_num, uf_info->grant_support);
 	/* Breakpoint Support */
 	ucc_set_qe_mux_bkpt(uf_info->ucc_num, uf_info->brkpt_support);
 	/* Set Tsa or NMSI mode. */
 	ucc_set_qe_mux_tsa(uf_info->ucc_num, uf_info->tsa);
 	/* If NMSI (not Tsa), set Tx and Rx clock. */
 	if (!uf_info->tsa) {
 		/* Rx clock routing */
 		if ((uf_info->rx_clock != QE_CLK_NONE) &&
 		    ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->rx_clock,
 					COMM_DIR_RX)) {
 			printk(KERN_ERR "%s: illegal value for RX clock\n",
 			       __func__);
 			ucc_fast_free(uccf);
 			return -EINVAL;
 		}
 		/* Tx clock routing */
 		if ((uf_info->tx_clock != QE_CLK_NONE) &&
 		    ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->tx_clock,
 					COMM_DIR_TX)) {
 			printk(KERN_ERR "%s: illegal value for TX clock\n",
 			       __func__);
 			ucc_fast_free(uccf);
 			return -EINVAL;
 		}
 	}

 	/* Set interrupt mask register at UCC level. */
 	out_be32(&uf_regs->uccm, uf_info->uccm_mask);

 	/* First, clear anything pending at UCC level,
 	 * otherwise, old garbage may come through
 	 * as soon as the dam is opened. */

 	/* Writing '1' clears */
 	out_be32(&uf_regs->ucce, 0xffffffff);

 	*uccf_ret = uccf;
 	return 0;
 }
 EXPORT_SYMBOL(ucc_fast_init);

 void ucc_fast_free(struct ucc_fast_private * uccf)
 {
 	if (!uccf)
 		return;

 	if (uccf->ucc_fast_tx_virtual_fifo_base_offset)
 		qe_muram_free(uccf->ucc_fast_tx_virtual_fifo_base_offset);

 	if (uccf->ucc_fast_rx_virtual_fifo_base_offset)
 		qe_muram_free(uccf->ucc_fast_rx_virtual_fifo_base_offset);

 	if (uccf->uf_regs)
 		iounmap(uccf->uf_regs);

 	kfree(uccf);
 }
 EXPORT_SYMBOL(ucc_fast_free);
	/*
	* Copyright (C) 2006 Freescale Semiconductor, Inc. All rights reserved.
	*
	* Authors: Shlomi Gridish <gridish@freescale.com>
	* Li Yang <leoli@freescale.com>
	*
	* Description:
	* QE UCC Fast API Set - UCC Fast specific routines implementations.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*/
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/slab.h>
	#include <linux/stddef.h>
	#include <linux/interrupt.h>
	#include <linux/err.h>
	#include <linux/export.h>

	#include <asm/io.h>
	#include <soc/fsl/qe/immap_qe.h>
	#include <soc/fsl/qe/qe.h>

	#include <soc/fsl/qe/ucc.h>
	#include <soc/fsl/qe/ucc_fast.h>

	void ucc_fast_dump_regs(struct ucc_fast_private * uccf)
	{
	printk(KERN_INFO "UCC%u Fast registers:\n", uccf->uf_info->ucc_num);
	printk(KERN_INFO "Base address: 0x%p\n", uccf->uf_regs);

	printk(KERN_INFO "gumr : addr=0x%p, val=0x%08x\n",
	&uccf->uf_regs->gumr, in_be32(&uccf->uf_regs->gumr));
	printk(KERN_INFO "upsmr : addr=0x%p, val=0x%08x\n",
	&uccf->uf_regs->upsmr, in_be32(&uccf->uf_regs->upsmr));
	printk(KERN_INFO "utodr : addr=0x%p, val=0x%04x\n",
	&uccf->uf_regs->utodr, in_be16(&uccf->uf_regs->utodr));
	printk(KERN_INFO "udsr : addr=0x%p, val=0x%04x\n",
	&uccf->uf_regs->udsr, in_be16(&uccf->uf_regs->udsr));
	printk(KERN_INFO "ucce : addr=0x%p, val=0x%08x\n",
	&uccf->uf_regs->ucce, in_be32(&uccf->uf_regs->ucce));
	printk(KERN_INFO "uccm : addr=0x%p, val=0x%08x\n",
	&uccf->uf_regs->uccm, in_be32(&uccf->uf_regs->uccm));
	printk(KERN_INFO "uccs : addr=0x%p, val=0x%02x\n",
	&uccf->uf_regs->uccs, in_8(&uccf->uf_regs->uccs));
	printk(KERN_INFO "urfb : addr=0x%p, val=0x%08x\n",
	&uccf->uf_regs->urfb, in_be32(&uccf->uf_regs->urfb));
	printk(KERN_INFO "urfs : addr=0x%p, val=0x%04x\n",
	&uccf->uf_regs->urfs, in_be16(&uccf->uf_regs->urfs));
	printk(KERN_INFO "urfet : addr=0x%p, val=0x%04x\n",
	&uccf->uf_regs->urfet, in_be16(&uccf->uf_regs->urfet));
	printk(KERN_INFO "urfset: addr=0x%p, val=0x%04x\n",
	&uccf->uf_regs->urfset, in_be16(&uccf->uf_regs->urfset));
	printk(KERN_INFO "utfb : addr=0x%p, val=0x%08x\n",
	&uccf->uf_regs->utfb, in_be32(&uccf->uf_regs->utfb));
	printk(KERN_INFO "utfs : addr=0x%p, val=0x%04x\n",
	&uccf->uf_regs->utfs, in_be16(&uccf->uf_regs->utfs));
	printk(KERN_INFO "utfet : addr=0x%p, val=0x%04x\n",
	&uccf->uf_regs->utfet, in_be16(&uccf->uf_regs->utfet));
	printk(KERN_INFO "utftt : addr=0x%p, val=0x%04x\n",
	&uccf->uf_regs->utftt, in_be16(&uccf->uf_regs->utftt));
	printk(KERN_INFO "utpt : addr=0x%p, val=0x%04x\n",
	&uccf->uf_regs->utpt, in_be16(&uccf->uf_regs->utpt));
	printk(KERN_INFO "urtry : addr=0x%p, val=0x%08x\n",
	&uccf->uf_regs->urtry, in_be32(&uccf->uf_regs->urtry));
	printk(KERN_INFO "guemr : addr=0x%p, val=0x%02x\n",
	&uccf->uf_regs->guemr, in_8(&uccf->uf_regs->guemr));
	}
	EXPORT_SYMBOL(ucc_fast_dump_regs);

	u32 ucc_fast_get_qe_cr_subblock(int uccf_num)
	{
	switch (uccf_num) {
	case 0: return QE_CR_SUBBLOCK_UCCFAST1;
	case 1: return QE_CR_SUBBLOCK_UCCFAST2;
	case 2: return QE_CR_SUBBLOCK_UCCFAST3;
	case 3: return QE_CR_SUBBLOCK_UCCFAST4;
	case 4: return QE_CR_SUBBLOCK_UCCFAST5;
	case 5: return QE_CR_SUBBLOCK_UCCFAST6;
	case 6: return QE_CR_SUBBLOCK_UCCFAST7;
	case 7: return QE_CR_SUBBLOCK_UCCFAST8;
	default: return QE_CR_SUBBLOCK_INVALID;
	}
	}
	EXPORT_SYMBOL(ucc_fast_get_qe_cr_subblock);

	void ucc_fast_transmit_on_demand(struct ucc_fast_private * uccf)
	{
	out_be16(&uccf->uf_regs->utodr, UCC_FAST_TOD);
	}
	EXPORT_SYMBOL(ucc_fast_transmit_on_demand);

	void ucc_fast_enable(struct ucc_fast_private * uccf, enum comm_dir mode)
	{
	struct ucc_fast __iomem *uf_regs;
	u32 gumr;

	uf_regs = uccf->uf_regs;

	/* Enable reception and/or transmission on this UCC. */
	gumr = in_be32(&uf_regs->gumr);
	if (mode & COMM_DIR_TX) {
	gumr \|= UCC_FAST_GUMR_ENT;
	uccf->enabled_tx = 1;
	}
	if (mode & COMM_DIR_RX) {
	gumr \|= UCC_FAST_GUMR_ENR;
	uccf->enabled_rx = 1;
	}
	out_be32(&uf_regs->gumr, gumr);
	}
	EXPORT_SYMBOL(ucc_fast_enable);

	void ucc_fast_disable(struct ucc_fast_private * uccf, enum comm_dir mode)
	{
	struct ucc_fast __iomem *uf_regs;
	u32 gumr;

	uf_regs = uccf->uf_regs;

	/* Disable reception and/or transmission on this UCC. */
	gumr = in_be32(&uf_regs->gumr);
	if (mode & COMM_DIR_TX) {
	gumr &= ~UCC_FAST_GUMR_ENT;
	uccf->enabled_tx = 0;
	}
	if (mode & COMM_DIR_RX) {
	gumr &= ~UCC_FAST_GUMR_ENR;
	uccf->enabled_rx = 0;
	}
	out_be32(&uf_regs->gumr, gumr);
	}
	EXPORT_SYMBOL(ucc_fast_disable);

	int ucc_fast_init(struct ucc_fast_info * uf_info, struct ucc_fast_private ** uccf_ret)
	{
	struct ucc_fast_private *uccf;
	struct ucc_fast __iomem *uf_regs;
	u32 gumr;
	int ret;

	if (!uf_info)
	return -EINVAL;

	/* check if the UCC port number is in range. */
	if ((uf_info->ucc_num < 0) \|\| (uf_info->ucc_num > UCC_MAX_NUM - 1)) {
	printk(KERN_ERR "%s: illegal UCC number\n", __func__);
	return -EINVAL;
	}

	/* Check that 'max_rx_buf_length' is properly aligned (4). */
	if (uf_info->max_rx_buf_length & (UCC_FAST_MRBLR_ALIGNMENT - 1)) {
	printk(KERN_ERR "%s: max_rx_buf_length not aligned\n",
	__func__);
	return -EINVAL;
	}

	/* Validate Virtual Fifo register values */
	if (uf_info->urfs < UCC_FAST_URFS_MIN_VAL) {
	printk(KERN_ERR "%s: urfs is too small\n", __func__);
	return -EINVAL;
	}

	if (uf_info->urfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
	printk(KERN_ERR "%s: urfs is not aligned\n", __func__);
	return -EINVAL;
	}

	if (uf_info->urfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
	printk(KERN_ERR "%s: urfet is not aligned.\n", __func__);
	return -EINVAL;
	}

	if (uf_info->urfset & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
	printk(KERN_ERR "%s: urfset is not aligned\n", __func__);
	return -EINVAL;
	}

	if (uf_info->utfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
	printk(KERN_ERR "%s: utfs is not aligned\n", __func__);
	return -EINVAL;
	}

	if (uf_info->utfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
	printk(KERN_ERR "%s: utfet is not aligned\n", __func__);
	return -EINVAL;
	}

	if (uf_info->utftt & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
	printk(KERN_ERR "%s: utftt is not aligned\n", __func__);
	return -EINVAL;
	}

	uccf = kzalloc(sizeof(struct ucc_fast_private), GFP_KERNEL);
	if (!uccf) {
	printk(KERN_ERR "%s: Cannot allocate private data\n",
	__func__);
	return -ENOMEM;
	}

	/* Fill fast UCC structure */
	uccf->uf_info = uf_info;
	/* Set the PHY base address */
	uccf->uf_regs = ioremap(uf_info->regs, sizeof(struct ucc_fast));
	if (uccf->uf_regs == NULL) {
	printk(KERN_ERR "%s: Cannot map UCC registers\n", __func__);
	kfree(uccf);
	return -ENOMEM;
	}

	uccf->enabled_tx = 0;
	uccf->enabled_rx = 0;
	uccf->stopped_tx = 0;
	uccf->stopped_rx = 0;
	uf_regs = uccf->uf_regs;
	uccf->p_ucce = &uf_regs->ucce;
	uccf->p_uccm = &uf_regs->uccm;
	#ifdef CONFIG_UGETH_TX_ON_DEMAND
	uccf->p_utodr = &uf_regs->utodr;
	#endif
	#ifdef STATISTICS
	uccf->tx_frames = 0;
	uccf->rx_frames = 0;
	uccf->rx_discarded = 0;
	#endif /* STATISTICS */

	/* Set UCC to fast type */
	ret = ucc_set_type(uf_info->ucc_num, UCC_SPEED_TYPE_FAST);
	if (ret) {
	printk(KERN_ERR "%s: cannot set UCC type\n", __func__);
	ucc_fast_free(uccf);
	return ret;
	}

	uccf->mrblr = uf_info->max_rx_buf_length;

	/* Set GUMR */
	/* For more details see the hardware spec. */
	gumr = uf_info->ttx_trx;
	if (uf_info->tci)
	gumr \|= UCC_FAST_GUMR_TCI;
	if (uf_info->cdp)
	gumr \|= UCC_FAST_GUMR_CDP;
	if (uf_info->ctsp)
	gumr \|= UCC_FAST_GUMR_CTSP;
	if (uf_info->cds)
	gumr \|= UCC_FAST_GUMR_CDS;
	if (uf_info->ctss)
	gumr \|= UCC_FAST_GUMR_CTSS;
	if (uf_info->txsy)
	gumr \|= UCC_FAST_GUMR_TXSY;
	if (uf_info->rsyn)
	gumr \|= UCC_FAST_GUMR_RSYN;
	gumr \|= uf_info->synl;
	if (uf_info->rtsm)
	gumr \|= UCC_FAST_GUMR_RTSM;
	gumr \|= uf_info->renc;
	if (uf_info->revd)
	gumr \|= UCC_FAST_GUMR_REVD;
	gumr \|= uf_info->tenc;
	gumr \|= uf_info->tcrc;
	gumr \|= uf_info->mode;
	out_be32(&uf_regs->gumr, gumr);

	/* Allocate memory for Tx Virtual Fifo */
	uccf->ucc_fast_tx_virtual_fifo_base_offset =
	qe_muram_alloc(uf_info->utfs, UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
	if (IS_ERR_VALUE(uccf->ucc_fast_tx_virtual_fifo_base_offset)) {
	printk(KERN_ERR "%s: cannot allocate MURAM for TX FIFO\n",
	__func__);
	uccf->ucc_fast_tx_virtual_fifo_base_offset = 0;
	ucc_fast_free(uccf);
	return -ENOMEM;
	}

	/* Allocate memory for Rx Virtual Fifo */
	uccf->ucc_fast_rx_virtual_fifo_base_offset =
	qe_muram_alloc(uf_info->urfs +
	UCC_FAST_RECEIVE_VIRTUAL_FIFO_SIZE_FUDGE_FACTOR,
	UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
	if (IS_ERR_VALUE(uccf->ucc_fast_rx_virtual_fifo_base_offset)) {
	printk(KERN_ERR "%s: cannot allocate MURAM for RX FIFO\n",
	__func__);
	uccf->ucc_fast_rx_virtual_fifo_base_offset = 0;
	ucc_fast_free(uccf);
	return -ENOMEM;
	}

	/* Set Virtual Fifo registers */
	out_be16(&uf_regs->urfs, uf_info->urfs);
	out_be16(&uf_regs->urfet, uf_info->urfet);
	out_be16(&uf_regs->urfset, uf_info->urfset);
	out_be16(&uf_regs->utfs, uf_info->utfs);
	out_be16(&uf_regs->utfet, uf_info->utfet);
	out_be16(&uf_regs->utftt, uf_info->utftt);
	/* utfb, urfb are offsets from MURAM base */
	out_be32(&uf_regs->utfb, uccf->ucc_fast_tx_virtual_fifo_base_offset);
	out_be32(&uf_regs->urfb, uccf->ucc_fast_rx_virtual_fifo_base_offset);

	/* Mux clocking */
	/* Grant Support */
	ucc_set_qe_mux_grant(uf_info->ucc_num, uf_info->grant_support);
	/* Breakpoint Support */
	ucc_set_qe_mux_bkpt(uf_info->ucc_num, uf_info->brkpt_support);
	/* Set Tsa or NMSI mode. */
	ucc_set_qe_mux_tsa(uf_info->ucc_num, uf_info->tsa);
	/* If NMSI (not Tsa), set Tx and Rx clock. */
	if (!uf_info->tsa) {
	/* Rx clock routing */
	if ((uf_info->rx_clock != QE_CLK_NONE) &&
	ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->rx_clock,
	COMM_DIR_RX)) {
	printk(KERN_ERR "%s: illegal value for RX clock\n",
	__func__);
	ucc_fast_free(uccf);
	return -EINVAL;
	}
	/* Tx clock routing */
	if ((uf_info->tx_clock != QE_CLK_NONE) &&
	ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->tx_clock,
	COMM_DIR_TX)) {
	printk(KERN_ERR "%s: illegal value for TX clock\n",
	__func__);
	ucc_fast_free(uccf);
	return -EINVAL;
	}
	}

	/* Set interrupt mask register at UCC level. */
	out_be32(&uf_regs->uccm, uf_info->uccm_mask);

	/* First, clear anything pending at UCC level,
	* otherwise, old garbage may come through
	* as soon as the dam is opened. */

	/* Writing '1' clears */
	out_be32(&uf_regs->ucce, 0xffffffff);

	*uccf_ret = uccf;
	return 0;
	}
	EXPORT_SYMBOL(ucc_fast_init);

	void ucc_fast_free(struct ucc_fast_private * uccf)
	{
	if (!uccf)
	return;

	if (uccf->ucc_fast_tx_virtual_fifo_base_offset)
	qe_muram_free(uccf->ucc_fast_tx_virtual_fifo_base_offset);

	if (uccf->ucc_fast_rx_virtual_fifo_base_offset)
	qe_muram_free(uccf->ucc_fast_rx_virtual_fifo_base_offset);

	if (uccf->uf_regs)
	iounmap(uccf->uf_regs);

	kfree(uccf);
	}
	EXPORT_SYMBOL(ucc_fast_free);