Re: [PATCH 5/5] drivers/net: support hdlc function for QE-UCC

[Christophe Leroy <christophe.leroy@c-s.fr>]

Le 30/03/2016 10:50, Zhao Qiang a écrit :
> The driver add hdlc support for Freescale QUICC Engine.
> It support NMSI and TSA mode.
When using TSA, how does the TSA gets configured ? Especially how do you 
describe which Timeslot is switched to HDLC channels ?
Is it possible to route some Timeslots to one UCC for HDLC, and route 
some others to another UCC for an ALSA sound driver ?

The QE also have a QMC which allows to split all timeslots to a given 
UCC into independant channels that can either be used with HDLC or 
transparents (for audio for instance). Do you intent to also support QMC ?

According to the compatible property, it looks like your driver is for 
freescale T1040. The MPC83xx also has a Quick Engine, would it work on 
it too ?

Christophe

>
> Signed-off-by: Zhao Qiang <qiang.zhao@nxp.com>
> ---
>   MAINTAINERS                    |    6 +
>   drivers/net/wan/Kconfig        |   12 +
>   drivers/net/wan/Makefile       |    1 +
>   drivers/net/wan/fsl_ucc_hdlc.c | 1339 ++++++++++++++++++++++++++++++++++++++++
>   drivers/net/wan/fsl_ucc_hdlc.h |  140 +++++
>   include/soc/fsl/qe/ucc_fast.h  |    4 +
>   6 files changed, 1502 insertions(+)
>   create mode 100644 drivers/net/wan/fsl_ucc_hdlc.c
>   create mode 100644 drivers/net/wan/fsl_ucc_hdlc.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 74bbff3..428d6ed 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4572,6 +4572,12 @@ F:	drivers/net/ethernet/freescale/gianfar*
>   X:	drivers/net/ethernet/freescale/gianfar_ptp.c
>   F:	Documentation/devicetree/bindings/net/fsl-tsec-phy.txt
>   
> +FREESCALE QUICC ENGINE UCC HDLC DRIVER
> +M:	Zhao Qiang <qiang.zhao@nxp.com>
> +L:	linuxppc-dev@lists.ozlabs.org
> +S:	Maintained
> +F:	drivers/net/wan/fsl_ucc_hdlc*
> +
>   FREESCALE QUICC ENGINE UCC UART DRIVER
>   M:	Timur Tabi <timur@tabi.org>
>   L:	linuxppc-dev@lists.ozlabs.org
> diff --git a/drivers/net/wan/Kconfig b/drivers/net/wan/Kconfig
> index a2fdd15..cc424b2 100644
> --- a/drivers/net/wan/Kconfig
> +++ b/drivers/net/wan/Kconfig
> @@ -280,6 +280,18 @@ config DSCC4
>   	  To compile this driver as a module, choose M here: the
>   	  module will be called dscc4.
>   
> +config FSL_UCC_HDLC
> +	tristate "Freescale QUICC Engine HDLC support"
> +	depends on HDLC
> +	select QE_TDM
> +	select QUICC_ENGINE
> +	help
> +	  Driver for Freescale QUICC Engine HDLC controller. The driver
> +	  support HDLC run on NMSI and TDM mode.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called fsl_ucc_hdlc.
> +
>   config DSCC4_PCISYNC
>   	bool "Etinc PCISYNC features"
>   	depends on DSCC4
> diff --git a/drivers/net/wan/Makefile b/drivers/net/wan/Makefile
> index c135ef4..25fec40 100644
> --- a/drivers/net/wan/Makefile
> +++ b/drivers/net/wan/Makefile
> @@ -32,6 +32,7 @@ obj-$(CONFIG_WANXL)		+= wanxl.o
>   obj-$(CONFIG_PCI200SYN)		+= pci200syn.o
>   obj-$(CONFIG_PC300TOO)		+= pc300too.o
>   obj-$(CONFIG_IXP4XX_HSS)	+= ixp4xx_hss.o
> +obj-$(CONFIG_FSL_UCC_HDLC)	+= fsl_ucc_hdlc.o
>   
>   clean-files := wanxlfw.inc
>   $(obj)/wanxl.o:	$(obj)/wanxlfw.inc
> diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
> new file mode 100644
> index 0000000..9958ec1
> --- /dev/null
> +++ b/drivers/net/wan/fsl_ucc_hdlc.c
> @@ -0,0 +1,1339 @@
> +/* Freescale QUICC Engine HDLC Device Driver
> + *
> + * Copyright 2014 Freescale Semiconductor Inc.
> + *
> + * 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/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/hdlc.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/irq.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/netdevice.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/sched.h>
> +#include <linux/skbuff.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <linux/stddef.h>
> +#include <soc/fsl/qe/qe_tdm.h>
> +#include <uapi/linux/if_arp.h>
> +
> +#include "fsl_ucc_hdlc.h"
> +
> +#define DRV_DESC "Freescale QE UCC HDLC Driver"
> +#define DRV_NAME "ucc_hdlc"
> +
> +#define TDM_PPPOHT_SLIC_MAXIN
> +/* #define DEBUG */
> +/* #define QE_HDLC_TEST */
> +#define BROKEN_FRAME_INFO
> +
> +static struct ucc_tdm_info utdm_primary_info = {
> +	.uf_info = {
> +		.tsa = 0,
> +		.cdp = 0,
> +		.cds = 1,
> +		.ctsp = 1,
> +		.ctss = 1,
> +		.revd = 0,
> +		.urfs = 256,
> +		.utfs = 256,
> +		.urfet = 128,
> +		.urfset = 192,
> +		.utfet = 128,
> +		.utftt = 0x40,
> +		.ufpt = 256,
> +		.mode = UCC_FAST_PROTOCOL_MODE_HDLC,
> +		.ttx_trx = UCC_FAST_GUMR_TRANSPARENT_TTX_TRX_NORMAL,
> +		.tenc = UCC_FAST_TX_ENCODING_NRZ,
> +		.renc = UCC_FAST_RX_ENCODING_NRZ,
> +		.tcrc = UCC_FAST_16_BIT_CRC,
> +		.synl = UCC_FAST_SYNC_LEN_NOT_USED,
> +	},
> +
> +	.si_info = {
> +#ifdef CONFIG_FSL_PQ_MDS_T1
> +		.simr_rfsd = 1,		/* TDM card need 1 bit delay */
> +		.simr_tfsd = 0,
> +#else
> +#ifdef TDM_PPPOHT_SLIC_MAXIN
> +		.simr_rfsd = 1,
> +		.simr_tfsd = 2,
> +#else
> +		.simr_rfsd = 0,
> +		.simr_tfsd = 0,
> +#endif
> +#endif
> +		.simr_crt = 0,
> +		.simr_sl = 0,
> +		.simr_ce = 1,
> +		.simr_fe = 1,
> +		.simr_gm = 0,
> +	},
> +};
> +
> +static struct ucc_tdm_info utdm_info[MAX_HDLC_NUM];
> +
> +#ifdef DEBUG
> +static void mem_disp(u8 *addr, int size)
> +{
> +	void *i;
> +	int size16_aling = (size >> 4) << 4;
> +	int size4_aling = (size >> 2) << 2;
> +	int not_align = 0;
> +
> +	if (size % 16)
> +		not_align = 1;
> +
> +	for (i = addr;  i < addr + size16_aling; i += 16) {
> +		u32 *i32 = i;
> +
> +		pr_info("0x%08p: %08x %08x %08x %08x\r\n",
> +			i32, be32_to_cpu(i32[0]), be32_to_cpu(i32[1]),
> +			be32_to_cpu(i32[2]), be32_to_cpu(i32[3]));
> +	}
> +
> +	if (not_align == 1)
> +		pr_info("0x%08p: ", i);
> +	for (; i < addr + size4_aling; i += 4)
> +		pr_info("%08x ", be32_to_cpu(*((u32 *)(i))));
> +	for (; i < addr + size; i++)
> +		pr_info("%02x", *((u8 *)(i)));
> +	if (not_align == 1)
> +		pr_info("\r\n");
> +}
> +
> +static void dump_ucc(struct ucc_hdlc_private *priv)
> +{
> +	struct ucc_hdlc_param *ucc_pram;
> +
> +	ucc_pram = priv->ucc_pram;
> +
> +	dev_info(priv->dev, "DumpiniCC %d Registers\n",
> +		 priv->ut_info->uf_info.ucc_num);
> +	ucc_fast_dump_regs(priv->uccf);
> +	dev_info(priv->dev, "Dumping UCC %d Parameter RAM\n",
> +		 priv->ut_info->uf_info.ucc_num);
> +	dev_info(priv->dev, "rbase = 0x%x\n", ioread32be(&ucc_pram->rbase));
> +	dev_info(priv->dev, "rbptr = 0x%x\n", ioread32be(&ucc_pram->rbptr));
> +	dev_info(priv->dev, "mrblr = 0x%x\n", ioread16be(&ucc_pram->mrblr));
> +	dev_info(priv->dev, "rbdlen = 0x%x\n", ioread16be(&ucc_pram->rbdlen));
> +	dev_info(priv->dev, "rbdstat = 0x%x\n", ioread16be(&ucc_pram->rbdstat));
> +	dev_info(priv->dev, "rstate = 0x%x\n", ioread32be(&ucc_pram->rstate));
> +	dev_info(priv->dev, "rdptr = 0x%x\n", ioread32be(&ucc_pram->rdptr));
> +	dev_info(priv->dev, "riptr = 0x%x\n", ioread16be(&ucc_pram->riptr));
> +	dev_info(priv->dev, "tbase = 0x%x\n", ioread32be(&ucc_pram->tbase));
> +	dev_info(priv->dev, "tbptr = 0x%x\n", ioread32be(&ucc_pram->tbptr));
> +	dev_info(priv->dev, "tbdlen = 0x%x\n", ioread16be(&ucc_pram->tbdlen));
> +	dev_info(priv->dev, "tbdstat = 0x%x\n", ioread16be(&ucc_pram->tbdstat));
> +	dev_info(priv->dev, "tstate = 0x%x\n", ioread32be(&ucc_pram->tstate));
> +	dev_info(priv->dev, "tdptr = 0x%x\n", ioread32be(&ucc_pram->tdptr));
> +	dev_info(priv->dev, "tiptr = 0x%x\n", ioread16be(&ucc_pram->tiptr));
> +	dev_info(priv->dev, "rcrc = 0x%x\n", ioread32be(&ucc_pram->rcrc));
> +	dev_info(priv->dev, "tcrc = 0x%x\n", ioread32be(&ucc_pram->tcrc));
> +	dev_info(priv->dev, "c_mask = 0x%x\n", ioread32be(&ucc_pram->c_mask));
> +	dev_info(priv->dev, "c_pers = 0x%x\n", ioread32be(&ucc_pram->c_pres));
> +	dev_info(priv->dev, "disfc = 0x%x\n", ioread16be(&ucc_pram->disfc));
> +	dev_info(priv->dev, "crcec = 0x%x\n", ioread16be(&ucc_pram->crcec));
> +}
> +
> +static void dump_bds(struct ucc_hdlc_private *priv)
> +{
> +	int length;
> +
> +	if (priv->tx_bd_base) {
> +		length = sizeof(struct qe_bd) * TX_BD_RING_LEN;
> +		dev_info(priv->dev, " Dump tx BDs\n");
> +		mem_disp((u8 *)priv->tx_bd_base, length);
> +	}
> +
> +	if (priv->rx_bd_base) {
> +		length = sizeof(struct qe_bd) * RX_BD_RING_LEN;
> +		dev_info(priv->dev, " Dump rx BDs\n");
> +		mem_disp((u8 *)priv->rx_bd_base, length);
> +	}
> +}
> +
> +static void dump_priv(struct ucc_hdlc_private *priv)
> +{
> +	dev_info(priv->dev, "ut_info = 0x%x\n", (u32)priv->ut_info);
> +	dev_info(priv->dev, "uccf = 0x%x\n", (u32)priv->uccf);
> +	dev_info(priv->dev, "uf_regs = 0x%x\n", (u32)priv->uf_regs);
> +	dev_info(priv->dev, "si_regs = 0x%x\n", (u32)priv->utdm->si_regs);
> +	dev_info(priv->dev, "ucc_pram = 0x%x\n", (u32)priv->ucc_pram);
> +	dev_info(priv->dev, "tdm_port = 0x%x\n", (u32)priv->utdm->tdm_port);
> +	dev_info(priv->dev, "siram_entry_id = 0x%x\n",
> +		 priv->utdm->siram_entry_id);
> +	dev_info(priv->dev, "siram = 0x%x\n", (u32)priv->utdm->siram);
> +	dev_info(priv->dev, "tdm_mode = 0x%x\n", (u32)priv->utdm->tdm_mode);
> +	dev_info(priv->dev, "tdm_framer_type; = 0x%x\n",
> +		 (u32)priv->utdm->tdm_framer_type);
> +	dev_info(priv->dev, "rx_buffer; = 0x%x\n", (u32)priv->rx_buffer);
> +	dev_info(priv->dev, "tx_buffer; = 0x%x\n", (u32)priv->tx_buffer);
> +	dev_info(priv->dev, "dma_rx_addr; = 0x%x\n", (u32)priv->dma_rx_addr);
> +	dev_info(priv->dev, "tx_bd; = 0x%x\n", (u32)priv->tx_bd_base);
> +	dev_info(priv->dev, "rx_bd; = 0x%x\n", (u32)priv->rx_bd_base);
> +	dev_info(priv->dev, "curtx_bd = 0x%x\n", (u32)priv->curtx_bd);
> +	dev_info(priv->dev, "currx_bd = 0x%x\n", (u32)priv->currx_bd);
> +	dev_info(priv->dev, "ucc_pram_offset = 0x%x\n", priv->ucc_pram_offset);
> +}
> +
> +#endif /* DEBUG */
> +
> +static int uhdlc_init(struct ucc_hdlc_private *priv)
> +{
> +	struct ucc_tdm_info *ut_info;
> +	struct ucc_fast_info *uf_info;
> +	u32 cecr_subblock;
> +	u32 bd_status;
> +	int ret, i;
> +	void *bd_buffer;
> +	dma_addr_t bd_dma_addr;
> +	u32 riptr;
> +	u32 tiptr;
> +	u32 gumr;
> +
> +	ut_info = priv->ut_info;
> +	uf_info = &ut_info->uf_info;
> +
> +	if (priv->tsa) {
> +		uf_info->tsa = 1;
> +		uf_info->ctsp = 1;
> +	}
> +	uf_info->uccm_mask = (u32)((UCC_HDLC_UCCE_RXB | UCC_HDLC_UCCE_RXF |
> +				UCC_HDLC_UCCE_TXB) << 16);
> +
> +	if (ucc_fast_init(uf_info, &priv->uccf)) {
> +		dev_err(priv->dev, "Failed to init uccf.");
> +		return -ENOMEM;
> +	}
> +
> +	priv->uf_regs = priv->uccf->uf_regs;
> +	ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
> +
> +	/* Loopback mode */
> +	if (priv->loopback) {
> +		pr_info("TDM Mode: Loopback Mode\n");
> +		gumr = ioread32be(&priv->uf_regs->gumr);
> +		gumr |= (0x40000000 | UCC_FAST_GUMR_CDS | UCC_FAST_GUMR_TCI);
> +		gumr &= ~(UCC_FAST_GUMR_CTSP | UCC_FAST_GUMR_RSYN);
> +		iowrite32be(gumr, &priv->uf_regs->gumr);
> +	}
> +
> +	/* Initialize SI */
> +	if (priv->tsa)
> +		ucc_tdm_init(priv->utdm, priv->ut_info);
> +
> +	/* Write to QE CECR, UCCx channel to Stop Transmission */
> +	cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
> +	ret = qe_issue_cmd(QE_STOP_TX, cecr_subblock,
> +			   (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
> +
> +	/* Set UPSMR normal mode (need fixed)*/
> +	iowrite32be(0, &priv->uf_regs->upsmr);
> +
> +	priv->rx_ring_size = RX_BD_RING_LEN;
> +	priv->tx_ring_size = TX_BD_RING_LEN;
> +	/* Alloc Rx BD */
> +	priv->rx_bd_base = dma_alloc_coherent(priv->dev,
> +			RX_BD_RING_LEN * sizeof(struct qe_bd *),
> +			&priv->dma_rx_bd, GFP_KERNEL);
> +
> +	if (IS_ERR_VALUE((unsigned long)priv->rx_bd_base)) {
> +		dev_err(priv->dev, "Cannot allocate MURAM memory for RxBDs\n");
> +		ret = -ENOMEM;
> +		goto rxbd_alloc_error;
> +	}
> +
> +	/* Alloc Tx BD */
> +	priv->tx_bd_base = dma_alloc_coherent(priv->dev,
> +			TX_BD_RING_LEN * sizeof(struct qe_bd *),
> +			&priv->dma_tx_bd, GFP_KERNEL);
> +
> +	if (IS_ERR_VALUE((unsigned long)priv->tx_bd_base)) {
> +		dev_err(priv->dev, "Cannot allocate MURAM memory for TxBDs\n");
> +		ret = -ENOMEM;
> +		goto txbd_alloc_error;
> +	}
> +
> +	/* Alloc parameter ram for ucc hdlc */
> +	priv->ucc_pram_offset = qe_muram_alloc(sizeof(priv->ucc_pram),
> +				ALIGNMENT_OF_UCC_HDLC_PRAM);
> +
> +	if (IS_ERR_VALUE(priv->ucc_pram_offset)) {
> +		dev_err(priv->dev, "Can not allocate MURAM for hdlc prameter.\n");
> +		ret = -ENOMEM;
> +		goto pram_alloc_error;
> +	}
> +
> +	priv->rx_skbuff = kmalloc_array(priv->rx_ring_size,
> +			sizeof(*priv->rx_skbuff), GFP_KERNEL);
> +	if (!priv->rx_skbuff)
> +		goto rx_skb_alloc_error;
> +	for (i = 0; i < priv->rx_ring_size; i++)
> +		priv->rx_skbuff[i] = NULL;
> +
> +	priv->tx_skbuff = kmalloc_array(priv->tx_ring_size,
> +			sizeof(*priv->tx_skbuff), GFP_KERNEL);
> +	if (!priv->tx_skbuff)
> +		goto tx_skb_alloc_error;
> +	for (i = 0; i < priv->tx_ring_size; i++)
> +		priv->tx_skbuff[i] = NULL;
> +
> +	priv->skb_curtx = 0;
> +	priv->skb_dirtytx = 0;
> +	priv->curtx_bd = priv->tx_bd_base;
> +	priv->dirty_tx = priv->tx_bd_base;
> +	priv->currx_bd = priv->rx_bd_base;
> +	priv->currx_bdnum = 0;
> +
> +	/* init parameter base */
> +	cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
> +	ret = qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, cecr_subblock,
> +			   QE_CR_PROTOCOL_UNSPECIFIED, priv->ucc_pram_offset);
> +
> +	priv->ucc_pram = (struct ucc_hdlc_param __iomem *)
> +					qe_muram_addr(priv->ucc_pram_offset);
> +
> +	/* Zero out parameter ram */
> +	memset_io(priv->ucc_pram, 0, sizeof(struct ucc_hdlc_param));
> +
> +	/* Alloc riptr, tiptr */
> +	riptr = qe_muram_alloc(32, 32);
> +	if (IS_ERR_VALUE(riptr)) {
> +		dev_err(priv->dev, "Cannot allocate MURAM mem for Receive internal temp data pointer\n");
> +		ret = -ENOMEM;
> +		goto riptr_alloc_error;
> +	}
> +
> +	tiptr = qe_muram_alloc(32, 32);
> +	if (IS_ERR_VALUE(tiptr)) {
> +		dev_err(priv->dev, "Cannot allocate MURAM mem for Transmit internal temp data pointer\n");
> +		ret = -ENOMEM;
> +		goto tiptr_alloc_error;
> +	}
> +
> +	/* Set RIPTR, TIPTR */
> +	iowrite16be((u16)riptr, &priv->ucc_pram->riptr);
> +	iowrite16be((u16)tiptr, &priv->ucc_pram->tiptr);
> +
> +	/* Set MRBLR */
> +	iowrite16be((u16)MAX_RX_BUF_LENGTH, &priv->ucc_pram->mrblr);
> +
> +		/* Set RBASE, TBASE */
> +	iowrite32be((u32)priv->dma_rx_bd, &priv->ucc_pram->rbase);
> +	iowrite32be((u32)priv->dma_tx_bd, &priv->ucc_pram->tbase);
> +
> +	/* Set RSTATE, TSTATE */
> +	iowrite32be(0x30000000, &priv->ucc_pram->rstate);
> +	iowrite32be(0x30000000, &priv->ucc_pram->tstate);
> +
> +	/* Set C_MASK, C_PRES for 16bit CRC */
> +	iowrite32be(0x0000F0B8, &priv->ucc_pram->c_mask);
> +	iowrite32be(0x0000FFFF, &priv->ucc_pram->c_pres);
> +
> +	iowrite16be(MAX_RX_BUF_LENGTH + 8, &priv->ucc_pram->mflr);
> +	iowrite16be(1, &priv->ucc_pram->rfthr);
> +	iowrite16be(1, &priv->ucc_pram->rfcnt);
> +	iowrite16be(DEFAULT_ADDR_MASK, &priv->ucc_pram->hmask);
> +	iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr1);
> +	iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr2);
> +	iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr3);
> +	iowrite16be(DEFAULT_HDLC_ADDR, &priv->ucc_pram->haddr4);
> +
> +	/* Get BD buffer */
> +	bd_buffer = dma_alloc_coherent(priv->dev,
> +				       (RX_BD_RING_LEN + TX_BD_RING_LEN) *
> +				       MAX_RX_BUF_LENGTH,
> +				       &bd_dma_addr, GFP_KERNEL);
> +
> +	if (!bd_buffer) {
> +		dev_err(priv->dev, "Could not allocate buffer descriptors\n");
> +		return -ENOMEM;
> +	}
> +
> +	memset(bd_buffer, 0, (RX_BD_RING_LEN + TX_BD_RING_LEN)
> +			* MAX_RX_BUF_LENGTH);
> +
> +	priv->rx_buffer = bd_buffer;
> +	priv->tx_buffer = bd_buffer + RX_BD_RING_LEN * MAX_RX_BUF_LENGTH;
> +
> +	priv->dma_rx_addr = bd_dma_addr;
> +	priv->dma_tx_addr = bd_dma_addr + RX_BD_RING_LEN * MAX_RX_BUF_LENGTH;
> +
> +	for (i = 0; i < RX_BD_RING_LEN; i++) {
> +		if (i < (RX_BD_RING_LEN - 1))
> +			bd_status = R_E | R_I;
> +		else
> +			bd_status = R_E | R_I | R_W;
> +
> +		iowrite32be(bd_status, (u32 *)(priv->rx_bd_base + i));
> +		iowrite32be(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH,
> +			    &priv->rx_bd_base[i].buf);
> +	}
> +
> +	for (i = 0; i < TX_BD_RING_LEN; i++) {
> +		if (i < (TX_BD_RING_LEN - 1))
> +			bd_status =  T_I | T_TC;
> +		else
> +			bd_status =  T_I | T_TC | T_W;
> +
> +		iowrite32be(bd_status, (u32 *)(priv->tx_bd_base + i));
> +		iowrite32be(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH,
> +			    &priv->tx_bd_base[i].buf);
> +	}
> +
> +	return 0;
> +
> +tiptr_alloc_error:
> +	qe_muram_free(riptr);
> +riptr_alloc_error:
> +	kfree(priv->tx_skbuff);
> +tx_skb_alloc_error:
> +	kfree(priv->rx_skbuff);
> +rx_skb_alloc_error:
> +	qe_muram_free(priv->ucc_pram_offset);
> +pram_alloc_error:
> +	dma_free_coherent(priv->dev,
> +			  TX_BD_RING_LEN * sizeof(struct qe_bd),
> +			  priv->tx_bd_base, priv->dma_tx_bd);
> +txbd_alloc_error:
> +	dma_free_coherent(priv->dev,
> +			  RX_BD_RING_LEN * sizeof(struct qe_bd),
> +			  priv->rx_bd_base, priv->dma_rx_bd);
> +rxbd_alloc_error:
> +	ucc_fast_free(priv->uccf);
> +
> +	return ret;
> +}
> +
> +static netdev_tx_t ucc_hdlc_tx(struct sk_buff *skb, struct net_device *dev)
> +{
> +	hdlc_device *hdlc = dev_to_hdlc(dev);
> +	struct ucc_hdlc_private *priv = (struct ucc_hdlc_private *)hdlc->priv;
> +	struct qe_bd __iomem *bd;
> +	u32 bd_status;
> +	unsigned long flags;
> +#ifdef QE_HDLC_TEST
> +	u8 *send_buf;
> +	int i;
> +#endif
> +	u16 *proto_head, tmp_head;
> +
> +	switch (dev->type) {
> +	case ARPHRD_RAWHDLC:
> +		if (skb_headroom(skb) < HDLC_HEAD_LEN) {
> +			dev->stats.tx_dropped++;
> +			dev_kfree_skb(skb);
> +			netdev_err(dev, "No enough space for hdlc head\n");
> +			return -ENOMEM;
> +		}
> +
> +		skb_push(skb, HDLC_HEAD_LEN);
> +
> +		proto_head = (u16 *)skb->data;
> +		tmp_head = *proto_head;
> +		tmp_head = (tmp_head & HDLC_HEAD_MASK) |
> +			    htons(DEFAULT_HDLC_HEAD);
> +		*proto_head = tmp_head;
> +
> +		dev->stats.tx_bytes += skb->len;
> +		break;
> +
> +	case ARPHRD_PPP:
> +		proto_head = (u16 *)skb->data;
> +		if (*proto_head != ntohs(DEFAULT_PPP_HEAD)) {
> +			dev->stats.tx_dropped++;
> +			dev_kfree_skb(skb);
> +			netdev_err(dev, "Wrong ppp header\n");
> +			return -ENOMEM;
> +		}
> +
> +		dev->stats.tx_bytes += skb->len;
> +		break;
> +
> +	default:
> +		dev->stats.tx_dropped++;
> +		dev_kfree_skb(skb);
> +		netdev_err(dev, "Protocol not supported!\n");
> +		return -ENOMEM;
> +
> +	} /*switch right bracket*/
> +
> +#ifdef QE_HDLC_TEST
> +	pr_info("Tx data skb->len:%d ", skb->len);
> +	send_buf = (u8 *)skb->data;
> +	pr_info("\nTransmitted data:\n");
> +	for (i = 0; (i < 16); i++) {
> +		if (i == skb->len)
> +			pr_info("++++");
> +		else
> +		pr_info("%02x\n", send_buf[i]);
> +	}
> +#endif
> +	spin_lock_irqsave(&priv->lock, flags);
> +
> +	/* Start from the next BD that should be filled */
> +	bd = priv->curtx_bd;
> +	bd_status = ioread32be((u32 __iomem *)bd);
> +	/* Save the skb pointer so we can free it later */
> +	priv->tx_skbuff[priv->skb_curtx] = skb;
> +
> +	/* Update the current skb pointer (wrapping if this was the last) */
> +	priv->skb_curtx =
> +	    (priv->skb_curtx + 1) & TX_RING_MOD_MASK(TX_BD_RING_LEN);
> +
> +	/* copy skb data to tx buffer for sdma processing */
> +	memcpy(priv->tx_buffer + (be32_to_cpu(bd->buf) - priv->dma_tx_addr),
> +	       skb->data, skb->len);
> +
> +	/* set bd status and length */
> +	bd_status = (bd_status & T_W) | T_R | T_I | T_L | T_TC | skb->len;
> +
> +	iowrite32be(bd_status, (u32 __iomem *)bd);
> +
> +	/* Move to next BD in the ring */
> +	if (!(bd_status & T_W))
> +		bd += 1;
> +	else
> +		bd = priv->tx_bd_base;
> +
> +	if (bd == priv->dirty_tx) {
> +		if (!netif_queue_stopped(dev))
> +			netif_stop_queue(dev);
> +	}
> +
> +	priv->curtx_bd = bd;
> +
> +	spin_unlock_irqrestore(&priv->lock, flags);
> +
> +	return NETDEV_TX_OK;
> +}
> +
> +static int hdlc_tx_done(struct ucc_hdlc_private *priv)
> +{
> +	/* Start from the next BD that should be filled */
> +	struct net_device *dev = priv->ndev;
> +	struct qe_bd *bd;		/* BD pointer */
> +	u32 bd_status;
> +
> +	bd = priv->dirty_tx;
> +	bd_status = ioread32be((u32 __iomem *)bd);
> +
> +	/* Normal processing. */
> +	while ((bd_status & T_R) == 0) {
> +		struct sk_buff *skb;
> +
> +		/* BD contains already transmitted buffer.   */
> +		/* Handle the transmitted buffer and release */
> +		/* the BD to be used with the current frame  */
> +
> +		skb = priv->tx_skbuff[priv->skb_dirtytx];
> +		if (!skb)
> +			break;
> +#ifdef QE_HDLC_TEST
> +		pr_info("TxBD: %x\n", bd_status);
> +#endif
> +		dev->stats.tx_packets++;
> +		memset(priv->tx_buffer +
> +		       (be32_to_cpu(bd->buf) - priv->dma_tx_addr),
> +		       0, skb->len);
> +		dev_kfree_skb_irq(skb);
> +
> +		priv->tx_skbuff[priv->skb_dirtytx] = NULL;
> +		priv->skb_dirtytx =
> +		    (priv->skb_dirtytx +
> +		     1) & TX_RING_MOD_MASK(TX_BD_RING_LEN);
> +
> +		/* We freed a buffer, so now we can restart transmission */
> +		if (netif_queue_stopped(dev))
> +			netif_wake_queue(dev);
> +
> +		/* Advance the confirmation BD pointer */
> +		if (!(bd_status & T_W))
> +			bd += 1;
> +		else
> +			bd = priv->tx_bd_base;
> +		bd_status = ioread32be((u32 __iomem *)bd);
> +	}
> +	priv->dirty_tx = bd;
> +
> +	return 0;
> +}
> +
> +static int hdlc_rx_done(struct ucc_hdlc_private *priv, int rx_work_limit)
> +{
> +	struct net_device *dev = priv->ndev;
> +	struct sk_buff *skb;
> +	hdlc_device *hdlc = dev_to_hdlc(dev);
> +	struct qe_bd *bd;
> +	u32 bd_status;
> +	u16 length, howmany = 0;
> +	u8 *bdbuffer;
> +#ifdef QE_HDLC_TEST
> +	int i;
> +	static int entry;
> +#endif
> +
> +	bd = priv->currx_bd;
> +	bd_status = ioread32be((u32 __iomem *)bd);
> +
> +	/* while there are received buffers and BD is full (~R_E) */
> +	while (!((bd_status & (R_E)) || (--rx_work_limit < 0))) {
> +		if (bd_status & R_CR) {
> +#ifdef BROKEN_FRAME_INFO
> +			pr_info("Broken Frame with RxBD: %x\n", bd_status);
> +#endif
> +			dev->stats.rx_dropped++;
> +			goto recycle;
> +		}
> +		bdbuffer = priv->rx_buffer +
> +			(priv->currx_bdnum * MAX_RX_BUF_LENGTH);
> +		length = (u16)(bd_status & BD_LENGTH_MASK);
> +
> +#ifdef QE_HDLC_TEST
> +		pr_info("Received data length:%d", length);
> +		pr_info("while entry times:%d", entry++);
> +
> +		pr_info("\nReceived data:\n");
> +		for (i = 0; (i < 16); i++) {
> +			if (i == length)
> +				pr_info("++++");
> +			else
> +			pr_info("%02x\n", bdbuffer[i]);
> +		}
> +#endif
> +
> +		switch (dev->type) {
> +		case ARPHRD_RAWHDLC:
> +			bdbuffer += HDLC_HEAD_LEN;
> +			length -= (HDLC_HEAD_LEN + HDLC_CRC_SIZE);
> +
> +			skb = dev_alloc_skb(length);
> +			if (!skb) {
> +				dev->stats.rx_dropped++;
> +				return -ENOMEM;
> +			}
> +
> +			skb_put(skb, length);
> +			skb->len = length;
> +			skb->dev = dev;
> +			memcpy(skb->data, bdbuffer, length);
> +			break;
> +
> +		case ARPHRD_PPP:
> +			length -= HDLC_CRC_SIZE;
> +
> +			skb = dev_alloc_skb(length);
> +			if (!skb) {
> +				dev->stats.rx_dropped++;
> +				return -ENOMEM;
> +			}
> +
> +			skb_put(skb, length);
> +			skb->len = length;
> +			skb->dev = dev;
> +			memcpy(skb->data, bdbuffer, length);
> +			break;
> +		}
> +
> +		dev->stats.rx_packets++;
> +		dev->stats.rx_bytes += skb->len;
> +		howmany++;
> +		if (hdlc->proto)
> +			skb->protocol = hdlc_type_trans(skb, dev);
> +#ifdef QE_HDLC_TEST
> +		pr_info("skb->protocol:%x\n", skb->protocol);
> +#endif
> +		netif_receive_skb(skb);
> +
> +recycle:
> +		iowrite32be((bd_status & ~BD_LENGTH_MASK) | R_E | R_I,
> +			    (u32 *)bd);
> +
> +		/* update to point at the next bd */
> +		if (bd_status & R_W) {
> +			priv->currx_bdnum = 0;
> +			bd = priv->rx_bd_base;
> +		} else {
> +			if (priv->currx_bdnum < (RX_BD_RING_LEN - 1))
> +				priv->currx_bdnum += 1;
> +			else
> +				priv->currx_bdnum = RX_BD_RING_LEN - 1;
> +
> +			bd += 1;
> +		}
> +
> +		bd_status = ioread32be((u32 __iomem *)bd);
> +	}
> +
> +	priv->currx_bd = bd;
> +	return howmany;
> +}
> +
> +static int ucc_hdlc_poll(struct napi_struct *napi, int budget)
> +{
> +	struct ucc_hdlc_private *priv = container_of(napi,
> +						     struct ucc_hdlc_private,
> +						     napi);
> +	int howmany;
> +
> +	/* Tx event processing */
> +	spin_lock(&priv->lock);
> +		hdlc_tx_done(priv);
> +	spin_unlock(&priv->lock);
> +
> +	howmany = 0;
> +	howmany += hdlc_rx_done(priv, budget - howmany);
> +
> +	if (howmany < budget) {
> +		napi_complete(napi);
> +		qe_setbits32(priv->uccf->p_uccm,
> +			     (UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS) << 16);
> +	}
> +
> +	return howmany;
> +}
> +
> +static irqreturn_t ucc_hdlc_irq_handler(int irq, void *dev_id)
> +{
> +	struct ucc_hdlc_private *priv = (struct ucc_hdlc_private *)dev_id;
> +	struct net_device *dev = priv->ndev;
> +	struct ucc_fast_private *uccf;
> +	struct ucc_tdm_info *ut_info;
> +	u32 ucce;
> +	u32 uccm;
> +
> +	ut_info = priv->ut_info;
> +	uccf = priv->uccf;
> +
> +	ucce = ioread32be(uccf->p_ucce);
> +	uccm = ioread32be(uccf->p_uccm);
> +	ucce &= uccm;
> +	iowrite32be(ucce, uccf->p_ucce);
> +#ifdef QE_HDLC_TEST
> +	pr_info("irq ucce:%x\n", ucce);
> +#endif
> +
> +	if ((ucce >> 16) & (UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS)) {
> +		if (napi_schedule_prep(&priv->napi)) {
> +			uccm &= ~((UCCE_HDLC_RX_EVENTS | UCCE_HDLC_TX_EVENTS)
> +				  << 16);
> +			iowrite32be(uccm, uccf->p_uccm);
> +			__napi_schedule(&priv->napi);
> +		}
> +	}
> +
> +	/* Errors and other events */
> +	if (ucce >> 16 & UCC_HDLC_UCCE_BSY)
> +		dev->stats.rx_errors++;
> +	if (ucce >> 16 & UCC_HDLC_UCCE_TXE)
> +		dev->stats.tx_errors++;
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int uhdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
> +{
> +	const size_t size = sizeof(te1_settings);
> +	te1_settings line;
> +	struct ucc_hdlc_private *priv = netdev_priv(dev);
> +
> +	if (cmd != SIOCWANDEV)
> +		return hdlc_ioctl(dev, ifr, cmd);
> +
> +	switch (ifr->ifr_settings.type) {
> +	case IF_GET_IFACE:
> +		ifr->ifr_settings.type = IF_IFACE_E1;
> +		if (ifr->ifr_settings.size < size) {
> +			ifr->ifr_settings.size = size; /* data size wanted */
> +			return -ENOBUFS;
> +		}
> +		line.clock_type = priv->clocking;
> +		line.clock_rate = 0;
> +		line.loopback = 0;
> +
> +		if (copy_to_user(ifr->ifr_settings.ifs_ifsu.sync, &line, size))
> +			return -EFAULT;
> +		return 0;
> +
> +	default:
> +		return hdlc_ioctl(dev, ifr, cmd);
> +	}
> +}
> +
> +static int uhdlc_open(struct net_device *dev)
> +{
> +	u32 cecr_subblock;
> +	hdlc_device *hdlc = dev_to_hdlc(dev);
> +	struct ucc_hdlc_private *priv = hdlc->priv;
> +	struct ucc_tdm *utdm = priv->utdm;
> +
> +	if (priv->hdlc_busy != 1) {
> +		if (request_irq(priv->ut_info->uf_info.irq,
> +				ucc_hdlc_irq_handler, 0,
> +				"hdlc", (void *)priv)) {
> +			dev_err(priv->dev, "request_irq for ucc hdlc failed\n");
> +			return -ENODEV;
> +		}
> +		cecr_subblock = ucc_fast_get_qe_cr_subblock(
> +					priv->ut_info->uf_info.ucc_num);
> +
> +		qe_issue_cmd(QE_INIT_TX_RX, cecr_subblock,
> +			     (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
> +
> +		ucc_fast_enable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
> +
> +		/* Enable the TDM port */
> +		if (priv->tsa)
> +			utdm->si_regs->siglmr1_h |= (0x1 << utdm->tdm_port);
> +
> +		priv->hdlc_busy = 1;
> +		netif_device_attach(priv->ndev);
> +		napi_enable(&priv->napi);
> +		netif_start_queue(dev);
> +		hdlc_open(dev);
> +	} else {
> +		dev_err(priv->dev, "HDLC IS RUNNING!\n");
> +	}
> +
> +#ifdef DEBUG
> +	dump_priv(priv);
> +	dump_ucc(priv);
> +	dump_bds(priv);
> +#endif
> +	return 0;
> +}
> +
> +static void uhdlc_memclean(struct ucc_hdlc_private *priv)
> +{
> +	qe_muram_free(priv->ucc_pram->riptr);
> +	qe_muram_free(priv->ucc_pram->tiptr);
> +
> +	if (priv->rx_bd_base) {
> +		dma_free_coherent(priv->dev,
> +				  RX_BD_RING_LEN * sizeof(struct qe_bd),
> +				  priv->rx_bd_base, priv->dma_rx_bd);
> +
> +		priv->rx_bd_base = NULL;
> +		priv->dma_rx_bd = 0;
> +	}
> +
> +	if (priv->tx_bd_base) {
> +		dma_free_coherent(priv->dev,
> +				  TX_BD_RING_LEN * sizeof(struct qe_bd),
> +				  priv->tx_bd_base, priv->dma_tx_bd);
> +
> +		priv->tx_bd_base = NULL;
> +		priv->dma_tx_bd = 0;
> +	}
> +
> +	if (priv->ucc_pram) {
> +		qe_muram_free(priv->ucc_pram_offset);
> +		priv->ucc_pram = NULL;
> +		priv->ucc_pram_offset = 0;
> +	 }
> +
> +	kfree(priv->rx_skbuff);
> +	priv->rx_skbuff = NULL;
> +
> +	kfree(priv->tx_skbuff);
> +	priv->tx_skbuff = NULL;
> +
> +	if (priv->uf_regs) {
> +		iounmap(priv->uf_regs);
> +		priv->uf_regs = NULL;
> +	}
> +
> +	if (priv->uccf) {
> +		ucc_fast_free(priv->uccf);
> +		priv->uccf = NULL;
> +	}
> +
> +	if (priv->rx_buffer) {
> +		dma_free_coherent(priv->dev,
> +				  RX_BD_RING_LEN * MAX_RX_BUF_LENGTH,
> +				  priv->rx_buffer, priv->dma_rx_addr);
> +		priv->rx_buffer = NULL;
> +		priv->dma_rx_addr = 0;
> +	}
> +
> +	if (priv->tx_buffer) {
> +		dma_free_coherent(priv->dev,
> +				  TX_BD_RING_LEN * MAX_RX_BUF_LENGTH,
> +				  priv->tx_buffer, priv->dma_tx_addr);
> +		priv->tx_buffer = NULL;
> +		priv->dma_tx_addr = 0;
> +	}
> +}
> +
> +static int uhdlc_close(struct net_device *dev)
> +{
> +	struct ucc_hdlc_private *priv = dev_to_hdlc(dev)->priv;
> +	struct ucc_tdm *utdm = priv->utdm;
> +	u32 cecr_subblock;
> +
> +	napi_disable(&priv->napi);
> +	cecr_subblock = ucc_fast_get_qe_cr_subblock(
> +				priv->ut_info->uf_info.ucc_num);
> +
> +	qe_issue_cmd(QE_GRACEFUL_STOP_TX, cecr_subblock,
> +		     (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
> +	qe_issue_cmd(QE_CLOSE_RX_BD, cecr_subblock,
> +		     (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
> +
> +	if (priv->tsa)
> +		utdm->si_regs->siglmr1_h &= ~(0x1 << utdm->tdm_port);
> +
> +	ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
> +
> +	free_irq(priv->ut_info->uf_info.irq, priv);
> +	netif_stop_queue(dev);
> +	priv->hdlc_busy = 0;
> +
> +	return 0;
> +}
> +
> +static int ucc_hdlc_attach(struct net_device *dev, unsigned short encoding,
> +			   unsigned short parity)
> +{
> +	struct ucc_hdlc_private *priv = dev_to_hdlc(dev)->priv;
> +
> +	if (encoding != ENCODING_NRZ &&
> +	    encoding != ENCODING_NRZI)
> +		return -EINVAL;
> +
> +	if (parity != PARITY_NONE &&
> +	    parity != PARITY_CRC32_PR1_CCITT &&
> +	    parity != PARITY_CRC16_PR1_CCITT)
> +		return -EINVAL;
> +
> +	priv->encoding = encoding;
> +	priv->parity = parity;
> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM
> +static void store_clk_config(struct ucc_hdlc_private *priv)
> +{
> +	struct qe_mux *qe_mux_reg = &qe_immr->qmx;
> +
> +	/* store si clk */
> +	priv->cmxsi1cr_h = ioread32be(&qe_mux_reg->cmxsi1cr_h);
> +	priv->cmxsi1cr_l = ioread32be(&qe_mux_reg->cmxsi1cr_l);
> +
> +	/* store si sync */
> +	priv->cmxsi1syr = ioread32be(&qe_mux_reg->cmxsi1syr);
> +
> +	/* store ucc clk */
> +	memcpy_fromio(priv->cmxucr, qe_mux_reg->cmxucr, 4 * sizeof(u32));
> +}
> +
> +static void resume_clk_config(struct ucc_hdlc_private *priv)
> +{
> +	struct qe_mux *qe_mux_reg = &qe_immr->qmx;
> +
> +	memcpy_toio(qe_mux_reg->cmxucr, priv->cmxucr, 4 * sizeof(u32));
> +
> +	iowrite32be(priv->cmxsi1cr_h, &qe_mux_reg->cmxsi1cr_h);
> +	iowrite32be(priv->cmxsi1cr_l, &qe_mux_reg->cmxsi1cr_l);
> +
> +	iowrite32be(priv->cmxsi1syr, &qe_mux_reg->cmxsi1syr);
> +}
> +
> +static int uhdlc_suspend(struct device *dev)
> +{
> +	struct ucc_hdlc_private *priv = dev_get_drvdata(dev);
> +	struct ucc_tdm_info *ut_info;
> +	struct ucc_fast __iomem *uf_regs;
> +
> +	if (!priv)
> +		return -EINVAL;
> +
> +	if (!netif_running(priv->ndev))
> +		return 0;
> +
> +	netif_device_detach(priv->ndev);
> +	napi_disable(&priv->napi);
> +
> +	ut_info = priv->ut_info;
> +	uf_regs = priv->uf_regs;
> +
> +	/* backup gumr guemr*/
> +	priv->gumr = ioread32be(&uf_regs->gumr);
> +	priv->guemr = ioread8(&uf_regs->guemr);
> +
> +	priv->ucc_pram_bak = kmalloc(sizeof(*priv->ucc_pram_bak),
> +					GFP_KERNEL);
> +	if (!priv->ucc_pram_bak)
> +		return -ENOMEM;
> +
> +	/* backup HDLC parameter */
> +	memcpy_fromio(priv->ucc_pram_bak, priv->ucc_pram,
> +		      sizeof(struct ucc_hdlc_param));
> +
> +	/* store the clk configuration */
> +	store_clk_config(priv);
> +
> +	/* save power */
> +	ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
> +
> +	dev_dbg(dev, "ucc hdlc suspend\n");
> +	return 0;
> +}
> +
> +static int uhdlc_resume(struct device *dev)
> +{
> +	struct ucc_hdlc_private *priv = dev_get_drvdata(dev);
> +	struct ucc_tdm *utdm = priv->utdm;
> +	struct ucc_tdm_info *ut_info;
> +	struct ucc_fast __iomem *uf_regs;
> +	struct ucc_fast_private *uccf;
> +	struct ucc_fast_info *uf_info;
> +	int ret, i;
> +	u32 cecr_subblock, bd_status;
> +
> +	if (!priv)
> +		return -EINVAL;
> +
> +	if (!netif_running(priv->ndev))
> +		return 0;
> +
> +	ut_info = priv->ut_info;
> +	uf_info = &ut_info->uf_info;
> +	uf_regs = priv->uf_regs;
> +	uccf = priv->uccf;
> +
> +	/* restore gumr guemr */
> +	iowrite8(priv->guemr, &uf_regs->guemr);
> +	iowrite32be(priv->gumr, &uf_regs->gumr);
> +
> +	/* Set Virtual Fifo registers */
> +	iowrite16be(uf_info->urfs, &uf_regs->urfs);
> +	iowrite16be(uf_info->urfet, &uf_regs->urfet);
> +	iowrite16be(uf_info->urfset, &uf_regs->urfset);
> +	iowrite16be(uf_info->utfs, &uf_regs->utfs);
> +	iowrite16be(uf_info->utfet, &uf_regs->utfet);
> +	iowrite16be(uf_info->utftt, &uf_regs->utftt);
> +	/* utfb, urfb are offsets from MURAM base */
> +	iowrite32be(uccf->ucc_fast_tx_virtual_fifo_base_offset, &uf_regs->utfb);
> +	iowrite32be(uccf->ucc_fast_rx_virtual_fifo_base_offset, &uf_regs->urfb);
> +
> +	/* Rx Tx and sync clock routing */
> +	resume_clk_config(priv);
> +
> +	iowrite32be(uf_info->uccm_mask, &uf_regs->uccm);
> +	iowrite32be(0xffffffff, &uf_regs->ucce);
> +
> +	ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
> +
> +	/* rebuild SIRAM */
> +	if (priv->tsa)
> +		ucc_tdm_init(priv->utdm, priv->ut_info);
> +
> +	/* Write to QE CECR, UCCx channel to Stop Transmission */
> +	cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
> +	ret = qe_issue_cmd(QE_STOP_TX, cecr_subblock,
> +			   (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
> +
> +	/* Set UPSMR normal mode */
> +	iowrite32be(0, &uf_regs->upsmr);
> +
> +	/* init parameter base */
> +	cecr_subblock = ucc_fast_get_qe_cr_subblock(uf_info->ucc_num);
> +	ret = qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, cecr_subblock,
> +			   QE_CR_PROTOCOL_UNSPECIFIED, priv->ucc_pram_offset);
> +
> +	priv->ucc_pram = (struct ucc_hdlc_param __iomem *)
> +				qe_muram_addr(priv->ucc_pram_offset);
> +
> +	/* restore ucc parameter */
> +	memcpy_toio(priv->ucc_pram, priv->ucc_pram_bak,
> +		    sizeof(struct ucc_hdlc_param));
> +	kfree(priv->ucc_pram_bak);
> +
> +	/* rebuild BD entry */
> +	for (i = 0; i < RX_BD_RING_LEN; i++) {
> +		if (i < (RX_BD_RING_LEN - 1))
> +			bd_status = R_E | R_I;
> +		else
> +			bd_status = R_E | R_I | R_W;
> +
> +		iowrite32be(bd_status, (u32 *)(priv->rx_bd_base + i));
> +		iowrite32be(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH,
> +			    &priv->rx_bd_base[i].buf);
> +	}
> +
> +	for (i = 0; i < TX_BD_RING_LEN; i++) {
> +		if (i < (TX_BD_RING_LEN - 1))
> +			bd_status =  T_I | T_TC;
> +		else
> +			bd_status =  T_I | T_TC | T_W;
> +
> +		iowrite32be(bd_status, (u32 *)(priv->tx_bd_base + i));
> +		iowrite32be(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH,
> +			    &priv->tx_bd_base[i].buf);
> +	}
> +
> +	/* if hdlc is busy enable TX and RX */
> +	if (priv->hdlc_busy == 1) {
> +		cecr_subblock = ucc_fast_get_qe_cr_subblock(
> +					priv->ut_info->uf_info.ucc_num);
> +
> +		qe_issue_cmd(QE_INIT_TX_RX, cecr_subblock,
> +			     (u8)QE_CR_PROTOCOL_UNSPECIFIED, 0);
> +
> +		ucc_fast_enable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX);
> +
> +		/* Enable the TDM port */
> +		if (priv->tsa)
> +			utdm->si_regs->siglmr1_h |= (0x1 << utdm->tdm_port);
> +	}
> +
> +	napi_enable(&priv->napi);
> +	netif_device_attach(priv->ndev);
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops uhdlc_pm_ops = {
> +	.suspend = uhdlc_suspend,
> +	.resume = uhdlc_resume,
> +	.freeze = uhdlc_suspend,
> +	.thaw = uhdlc_resume,
> +};
> +
> +#define HDLC_PM_OPS (&uhdlc_pm_ops)
> +
> +#else
> +
> +#define HDLC_PM_OPS NULL
> +
> +#endif
> +static const struct net_device_ops uhdlc_ops = {
> +	.ndo_open       = uhdlc_open,
> +	.ndo_stop       = uhdlc_close,
> +	.ndo_change_mtu = hdlc_change_mtu,
> +	.ndo_start_xmit = hdlc_start_xmit,
> +	.ndo_do_ioctl   = uhdlc_ioctl,
> +};
> +
> +static int ucc_hdlc_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct ucc_hdlc_private *uhdlc_priv = NULL;
> +	struct ucc_tdm_info *ut_info;
> +	struct ucc_tdm *utdm;
> +	struct resource res;
> +	struct net_device *dev;
> +	hdlc_device *hdlc;
> +	int ucc_num;
> +	const char *sprop;
> +	int ret;
> +	u32 val;
> +
> +	ret = of_property_read_u32_index(np, "cell-index", 0, &val);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Invalid ucc property\n");
> +		return -ENODEV;
> +	}
> +
> +	ucc_num = val - 1;
> +	if ((ucc_num > 3) || (ucc_num < 0)) {
> +		dev_err(&pdev->dev, ": Invalid UCC num\n");
> +		return -EINVAL;
> +	}
> +
> +	memcpy(&utdm_info[ucc_num], &utdm_primary_info,
> +	       sizeof(utdm_primary_info));
> +
> +	ut_info = &utdm_info[ucc_num];
> +	ut_info->uf_info.ucc_num = ucc_num;
> +
> +	sprop = of_get_property(np, "rx-clock-name", NULL);
> +	if (sprop) {
> +		ut_info->uf_info.rx_clock = qe_clock_source(sprop);
> +		if ((ut_info->uf_info.rx_clock < QE_CLK_NONE) ||
> +		    (ut_info->uf_info.rx_clock > QE_CLK24)) {
> +			dev_err(&pdev->dev, "Invalid rx-clock-name property\n");
> +			return -EINVAL;
> +		}
> +	} else {
> +		dev_err(&pdev->dev, "Invalid rx-clock-name property\n");
> +		return -EINVAL;
> +	}
> +
> +	sprop = of_get_property(np, "tx-clock-name", NULL);
> +	if (sprop) {
> +		ut_info->uf_info.tx_clock = qe_clock_source(sprop);
> +		if ((ut_info->uf_info.tx_clock < QE_CLK_NONE) ||
> +		    (ut_info->uf_info.tx_clock > QE_CLK24)) {
> +			dev_err(&pdev->dev, "Invalid tx-clock-name property\n");
> +			return -EINVAL;
> +		}
> +	} else {
> +		dev_err(&pdev->dev, "Invalid tx-clock-name property\n");
> +		return -EINVAL;
> +	}
> +
> +	/* use the same clock when work in loopback */
> +	if (ut_info->uf_info.rx_clock == ut_info->uf_info.tx_clock)
> +		qe_setbrg(ut_info->uf_info.rx_clock, 20000000, 1);
> +
> +	ret = of_address_to_resource(np, 0, &res);
> +	if (ret)
> +		return -EINVAL;
> +
> +	ut_info->uf_info.regs = res.start;
> +	ut_info->uf_info.irq = irq_of_parse_and_map(np, 0);
> +
> +	uhdlc_priv = kzalloc(sizeof(*uhdlc_priv), GFP_KERNEL);
> +	if (!uhdlc_priv) {
> +		ret = -ENOMEM;
> +		dev_err(&pdev->dev, "No mem to alloc hdlc private data\n");
> +		goto err_alloc_priv;
> +	}
> +
> +	dev_set_drvdata(&pdev->dev, uhdlc_priv);
> +	uhdlc_priv->dev = &pdev->dev;
> +	uhdlc_priv->ut_info = ut_info;
> +
> +	if (of_get_property(np, "fsl,tdm-interface", NULL))
> +		uhdlc_priv->tsa = 1;
> +
> +	if (of_get_property(np, "fsl,ucc-internal-loopback", NULL))
> +		uhdlc_priv->loopback = 1;
> +
> +	if (uhdlc_priv->tsa == 1) {
> +		utdm = kzalloc(sizeof(*utdm), GFP_KERNEL);
> +		if (!utdm) {
> +			ret = -ENOMEM;
> +			dev_err(&pdev->dev, "No mem to alloc ucc tdm data\n");
> +			goto err_alloc_utdm;
> +		}
> +		uhdlc_priv->utdm = utdm;
> +		ret = ucc_of_parse_tdm(np, utdm, ut_info);
> +		if (ret)
> +			goto err_miss_tsa_property;
> +	}
> +
> +	ret = uhdlc_init(uhdlc_priv);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Failed to init uhdlc\n");
> +		goto err_hdlc_init;
> +	}
> +
> +	dev = alloc_hdlcdev(uhdlc_priv);
> +	if (!dev) {
> +		ret = -ENOMEM;
> +		pr_err("ucc_hdlc: unable to allocate memory\n");
> +		goto err_hdlc_init;
> +	}
> +
> +	uhdlc_priv->ndev = dev;
> +	hdlc = dev_to_hdlc(dev);
> +	dev->tx_queue_len = 16;
> +	dev->netdev_ops = &uhdlc_ops;
> +	hdlc->attach = ucc_hdlc_attach;
> +	hdlc->xmit = ucc_hdlc_tx;
> +	netif_napi_add(dev, &uhdlc_priv->napi, ucc_hdlc_poll, 32);
> +	if (register_hdlc_device(dev)) {
> +		ret = -ENOBUFS;
> +		pr_err("ucc_hdlc: unable to register hdlc device\n");
> +		free_netdev(dev);
> +		goto err_hdlc_init;
> +	}
> +
> +#ifdef DEBUG
> +	dump_priv(uhdlc_priv);
> +	dump_ucc(uhdlc_priv);
> +	dump_bds(uhdlc_priv);
> +	if (uhdlc_priv->tsa)
> +		mem_disp((u8 *)uhdlc_priv->utdm->si_regs, 0x20);
> +#endif
> +
> +	return 0;
> +
> +err_hdlc_init:
> +err_miss_tsa_property:
> +	kfree(uhdlc_priv);
> +	if (uhdlc_priv->tsa)
> +		kfree(utdm);
> +err_alloc_utdm:
> +	kfree(uhdlc_priv);
> +err_alloc_priv:
> +	return ret;
> +}
> +
> +static int ucc_hdlc_remove(struct platform_device *pdev)
> +{
> +	struct ucc_hdlc_private *priv = dev_get_drvdata(&pdev->dev);
> +
> +	uhdlc_memclean(priv);
> +
> +	if (priv->utdm->si_regs) {
> +		iounmap(priv->utdm->si_regs);
> +		priv->utdm->si_regs = NULL;
> +	}
> +
> +	if (priv->utdm->siram) {
> +		iounmap(priv->utdm->siram);
> +		priv->utdm->siram = NULL;
> +	}
> +	kfree(priv);
> +
> +	dev_info(&pdev->dev, "UCC based hdlc module removed\n");
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id fsl_ucc_hdlc_of_match[] = {
> +	{
> +	.compatible = "fsl,ucc-hdlc",
> +	},
> +	{},
> +};
> +
> +MODULE_DEVICE_TABLE(of, fsl_ucc_hdlc_of_match);
> +
> +static struct platform_driver ucc_hdlc_driver = {
> +	.probe	= ucc_hdlc_probe,
> +	.remove	= ucc_hdlc_remove,
> +	.driver	= {
> +		.owner		= THIS_MODULE,
> +		.name		= DRV_NAME,
> +		.pm		= HDLC_PM_OPS,
> +		.of_match_table	= fsl_ucc_hdlc_of_match,
> +	},
> +};
> +
> +static int __init ucc_hdlc_init(void)
> +{
> +	return platform_driver_register(&ucc_hdlc_driver);
> +}
> +
> +static void __exit ucc_hdlc_exit(void)
> +{
> +	platform_driver_unregister(&ucc_hdlc_driver);
> +}
> +
> +module_init(ucc_hdlc_init);
> +module_exit(ucc_hdlc_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Freescale Semiconductor Inc.");
> +MODULE_DESCRIPTION("Driver For Freescale QE UCC HDLC controller");
> +MODULE_VERSION("1.0");
> diff --git a/drivers/net/wan/fsl_ucc_hdlc.h b/drivers/net/wan/fsl_ucc_hdlc.h
> new file mode 100644
> index 0000000..ded03d6
> --- /dev/null
> +++ b/drivers/net/wan/fsl_ucc_hdlc.h
> @@ -0,0 +1,140 @@
> +/* Freescale QUICC Engine HDLC Device Driver
> + *
> + * Copyright 2014 Freescale Semiconductor Inc.
> + *
> + * 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.
> + */
> +
> +#ifndef CONFIG_UCC_HDLC_H
> +#define CONFIG_UCC_HDLC_H
> +
> +#include <linux/kernel.h>
> +#include <linux/list.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>
> +
> +/* UCC HDLC event register */
> +#define UCCE_HDLC_RX_EVENTS	\
> +(UCC_HDLC_UCCE_RXF | UCC_HDLC_UCCE_RXB | UCC_HDLC_UCCE_BSY)
> +#define UCCE_HDLC_TX_EVENTS	(UCC_HDLC_UCCE_TXB | UCC_HDLC_UCCE_TXE)
> +
> +struct ucc_hdlc_param {
> +	__be16 riptr;
> +	__be16 tiptr;
> +	__be16 res0;
> +	__be16 mrblr;
> +	__be32 rstate;
> +	__be32 rbase;
> +	__be16 rbdstat;
> +	__be16 rbdlen;
> +	__be32 rdptr;
> +	__be32 tstate;
> +	__be32 tbase;
> +	__be16 tbdstat;
> +	__be16 tbdlen;
> +	__be32 tdptr;
> +	__be32 rbptr;
> +	__be32 tbptr;
> +	__be32 rcrc;
> +	__be32 res1;
> +	__be32 tcrc;
> +	__be32 res2;
> +	__be32 res3;
> +	__be32 c_mask;
> +	__be32 c_pres;
> +	__be16 disfc;
> +	__be16 crcec;
> +	__be16 abtsc;
> +	__be16 nmarc;
> +	__be32 max_cnt;
> +	__be16 mflr;
> +	__be16 rfthr;
> +	__be16 rfcnt;
> +	__be16 hmask;
> +	__be16 haddr1;
> +	__be16 haddr2;
> +	__be16 haddr3;
> +	__be16 haddr4;
> +	__be16 ts_tmp;
> +	__be16 tmp_mb;
> +} __attribute__ ((__packed__));
> +
> +struct ucc_hdlc_private {
> +	struct ucc_tdm	*utdm;
> +	struct ucc_tdm_info *ut_info;
> +	struct ucc_fast_private *uccf;
> +	struct device *dev;
> +	struct net_device *ndev;
> +	struct napi_struct napi;
> +	struct ucc_fast __iomem *uf_regs;	/* UCC Fast registers */
> +	struct ucc_hdlc_param __iomem *ucc_pram;
> +	u16 tsa;
> +	bool hdlc_busy;
> +	u8 loopback;
> +
> +	u8 *tx_buffer;		/* buffer used for Tx by the HDLC */
> +	u8 *rx_buffer;		/* buffer used for Rx by the HDLC */
> +	dma_addr_t dma_tx_addr;	/* dma mapped buffer for HDLC Tx */
> +	dma_addr_t dma_rx_addr;	/* dma mapped buffer for HDLC Rx */
> +
> +	struct qe_bd *tx_bd_base;
> +	struct qe_bd *rx_bd_base;
> +	dma_addr_t dma_tx_bd;
> +	dma_addr_t dma_rx_bd;
> +	struct qe_bd *curtx_bd;
> +	struct qe_bd *currx_bd;
> +	struct qe_bd *dirty_tx;
> +	u16 currx_bdnum;
> +
> +	struct sk_buff **tx_skbuff;
> +	struct sk_buff **rx_skbuff;
> +	u16 skb_curtx;
> +	u16 skb_currx;
> +	unsigned short skb_dirtytx;
> +
> +	unsigned short tx_ring_size;
> +	unsigned short rx_ring_size;
> +	u32 ucc_pram_offset;
> +
> +	unsigned short encoding;
> +	unsigned short parity;
> +	u32 clocking;
> +	spinlock_t lock;	/* lock for Tx BD and Tx buffer */
> +#ifdef CONFIG_PM
> +	struct ucc_hdlc_param *ucc_pram_bak;
> +	u32 gumr;
> +	u8 guemr;
> +	u32 cmxsi1cr_l, cmxsi1cr_h;
> +	u32 cmxsi1syr;
> +	u32 cmxucr[4];
> +#endif
> +};
> +
> +#define TX_BD_RING_LEN	0x10
> +#define RX_BD_RING_LEN	0x20
> +#define RX_CLEAN_MAX	0x10
> +#define NUM_OF_BUF	4
> +#define MAX_RX_BUF_LENGTH	(48 * 0x20)
> +#define ALIGNMENT_OF_UCC_HDLC_PRAM	64
> +#define SI_BANK_SIZE	128
> +#define MAX_HDLC_NUM	4
> +#define HDLC_HEAD_LEN	2
> +#define HDLC_CRC_SIZE	2
> +#define TX_RING_MOD_MASK(size) (size - 1)
> +#define RX_RING_MOD_MASK(size) (size - 1)
> +
> +#define HDLC_HEAD_MASK		0x0000
> +#define DEFAULT_HDLC_HEAD	0xff44
> +#define DEFAULT_ADDR_MASK	0x00ff
> +#define DEFAULT_HDLC_ADDR	0x00ff
> +
> +#define DEFAULT_PPP_HEAD    0xff03
> +
> +#endif
> diff --git a/include/soc/fsl/qe/ucc_fast.h b/include/soc/fsl/qe/ucc_fast.h
> index e898895..d775550 100644
> --- a/include/soc/fsl/qe/ucc_fast.h
> +++ b/include/soc/fsl/qe/ucc_fast.h
> @@ -27,12 +27,16 @@
>   #define R_I	0x10000000	/* interrupt on reception */
>   #define R_L	0x08000000	/* last */
>   #define R_F	0x04000000	/* first */
> +#define R_CM	0x02000000	/* first */
> +#define R_CR	0x00040000	/* first */
>   
>   /* transmit BD's status */
>   #define T_R	0x80000000	/* ready bit */
>   #define T_W	0x20000000	/* wrap bit */
>   #define T_I	0x10000000	/* interrupt on completion */
>   #define T_L	0x08000000	/* last */
> +#define T_TC	0x04000000	/* crc */
> +#define T_TM	0x02000000	/* crc */
>   
>   /* Rx Data buffer must be 4 bytes aligned in most cases */
>   #define UCC_FAST_RX_ALIGN			4