diff options
Diffstat (limited to 'drivers/net/wan/fsl_ucc_hdlc.c')
| -rw-r--r-- | drivers/net/wan/fsl_ucc_hdlc.c | 1310 |
1 files changed, 1310 insertions, 0 deletions
diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c new file mode 100644 index 000000000..5fec8abe8 --- /dev/null +++ b/drivers/net/wan/fsl_ucc_hdlc.c @@ -0,0 +1,1310 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Freescale QUICC Engine HDLC Device Driver + * + * Copyright 2016 Freescale Semiconductor Inc. + */ + +#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 RX_BD_ERRORS (R_CD_S | R_OV_S | R_CR_S | R_AB_S | R_NO_S | R_LG_S) + +static int uhdlc_close(struct net_device *dev); + +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 TDM_PPPOHT_SLIC_MAXIN + .simr_rfsd = 1, + .simr_tfsd = 2, +#else + .simr_rfsd = 0, + .simr_tfsd = 0, +#endif + .simr_crt = 0, + .simr_sl = 0, + .simr_ce = 1, + .simr_fe = 1, + .simr_gm = 0, + }, +}; + +static struct ucc_tdm_info utdm_info[UCC_MAX_NUM]; + +static int uhdlc_init(struct ucc_hdlc_private *priv) +{ + struct ucc_tdm_info *ut_info; + struct ucc_fast_info *uf_info; + u32 cecr_subblock; + u16 bd_status; + int ret, i; + void *bd_buffer; + dma_addr_t bd_dma_addr; + s32 riptr; + s32 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->cds = 1; + uf_info->ctss = 1; + } else { + uf_info->cds = 0; + uf_info->ctsp = 0; + uf_info->ctss = 0; + } + + /* This sets HPM register in CMXUCR register which configures a + * open drain connected HDLC bus + */ + if (priv->hdlc_bus) + uf_info->brkpt_support = 1; + + uf_info->uccm_mask = ((UCC_HDLC_UCCE_RXB | UCC_HDLC_UCCE_RXF | + UCC_HDLC_UCCE_TXB) << 16); + + ret = ucc_fast_init(uf_info, &priv->uccf); + if (ret) { + dev_err(priv->dev, "Failed to init uccf."); + return ret; + } + + priv->uf_regs = priv->uccf->uf_regs; + ucc_fast_disable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX); + + /* Loopback mode */ + if (priv->loopback) { + dev_info(priv->dev, "Loopback Mode\n"); + /* use the same clock when work in loopback */ + qe_setbrg(ut_info->uf_info.rx_clock, 20000000, 1); + + gumr = ioread32be(&priv->uf_regs->gumr); + gumr |= (UCC_FAST_GUMR_LOOPBACK | 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, + QE_CR_PROTOCOL_UNSPECIFIED, 0); + + /* Set UPSMR normal mode (need fixed)*/ + iowrite32be(0, &priv->uf_regs->upsmr); + + /* hdlc_bus mode */ + if (priv->hdlc_bus) { + u32 upsmr; + + dev_info(priv->dev, "HDLC bus Mode\n"); + upsmr = ioread32be(&priv->uf_regs->upsmr); + + /* bus mode and retransmit enable, with collision window + * set to 8 bytes + */ + upsmr |= UCC_HDLC_UPSMR_RTE | UCC_HDLC_UPSMR_BUS | + UCC_HDLC_UPSMR_CW8; + iowrite32be(upsmr, &priv->uf_regs->upsmr); + + /* explicitly disable CDS & CTSP */ + gumr = ioread32be(&priv->uf_regs->gumr); + gumr &= ~(UCC_FAST_GUMR_CDS | UCC_FAST_GUMR_CTSP); + /* set automatic sync to explicitly ignore CD signal */ + gumr |= UCC_FAST_GUMR_SYNL_AUTO; + iowrite32be(gumr, &priv->uf_regs->gumr); + } + + 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 (!priv->rx_bd_base) { + dev_err(priv->dev, "Cannot allocate MURAM memory for RxBDs\n"); + ret = -ENOMEM; + goto free_uccf; + } + + /* 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 (!priv->tx_bd_base) { + dev_err(priv->dev, "Cannot allocate MURAM memory for TxBDs\n"); + ret = -ENOMEM; + goto free_rx_bd; + } + + /* Alloc parameter ram for ucc hdlc */ + priv->ucc_pram_offset = qe_muram_alloc(sizeof(struct ucc_hdlc_param), + ALIGNMENT_OF_UCC_HDLC_PRAM); + + if (priv->ucc_pram_offset < 0) { + dev_err(priv->dev, "Can not allocate MURAM for hdlc parameter.\n"); + ret = -ENOMEM; + goto free_tx_bd; + } + + priv->rx_skbuff = kcalloc(priv->rx_ring_size, + sizeof(*priv->rx_skbuff), + GFP_KERNEL); + if (!priv->rx_skbuff) { + ret = -ENOMEM; + goto free_ucc_pram; + } + + priv->tx_skbuff = kcalloc(priv->tx_ring_size, + sizeof(*priv->tx_skbuff), + GFP_KERNEL); + if (!priv->tx_skbuff) { + ret = -ENOMEM; + goto free_rx_skbuff; + } + + 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 (riptr < 0) { + dev_err(priv->dev, "Cannot allocate MURAM mem for Receive internal temp data pointer\n"); + ret = -ENOMEM; + goto free_tx_skbuff; + } + + tiptr = qe_muram_alloc(32, 32); + if (tiptr < 0) { + dev_err(priv->dev, "Cannot allocate MURAM mem for Transmit internal temp data pointer\n"); + ret = -ENOMEM; + goto free_riptr; + } + if (riptr != (u16)riptr || tiptr != (u16)tiptr) { + dev_err(priv->dev, "MURAM allocation out of addressable range\n"); + ret = -ENOMEM; + goto free_tiptr; + } + + /* Set RIPTR, TIPTR */ + iowrite16be(riptr, &priv->ucc_pram->riptr); + iowrite16be(tiptr, &priv->ucc_pram->tiptr); + + /* Set MRBLR */ + iowrite16be(MAX_RX_BUF_LENGTH, &priv->ucc_pram->mrblr); + + /* Set RBASE, TBASE */ + iowrite32be(priv->dma_rx_bd, &priv->ucc_pram->rbase); + iowrite32be(priv->dma_tx_bd, &priv->ucc_pram->tbase); + + /* Set RSTATE, TSTATE */ + iowrite32be(BMR_GBL | BMR_BIG_ENDIAN, &priv->ucc_pram->rstate); + iowrite32be(BMR_GBL | BMR_BIG_ENDIAN, &priv->ucc_pram->tstate); + + /* Set C_MASK, C_PRES for 16bit CRC */ + iowrite32be(CRC_16BIT_MASK, &priv->ucc_pram->c_mask); + iowrite32be(CRC_16BIT_PRES, &priv->ucc_pram->c_pres); + + iowrite16be(MAX_FRAME_LENGTH, &priv->ucc_pram->mflr); + iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfthr); + iowrite16be(DEFAULT_RFTHR, &priv->ucc_pram->rfcnt); + iowrite16be(priv->hmask, &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"); + ret = -ENOMEM; + goto free_tiptr; + } + + 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_S | R_I_S; + else + bd_status = R_E_S | R_I_S | R_W_S; + + priv->rx_bd_base[i].status = cpu_to_be16(bd_status); + priv->rx_bd_base[i].buf = cpu_to_be32(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH); + } + + for (i = 0; i < TX_BD_RING_LEN; i++) { + if (i < (TX_BD_RING_LEN - 1)) + bd_status = T_I_S | T_TC_S; + else + bd_status = T_I_S | T_TC_S | T_W_S; + + priv->tx_bd_base[i].status = cpu_to_be16(bd_status); + priv->tx_bd_base[i].buf = cpu_to_be32(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH); + } + dma_wmb(); + + return 0; + +free_tiptr: + qe_muram_free(tiptr); +free_riptr: + qe_muram_free(riptr); +free_tx_skbuff: + kfree(priv->tx_skbuff); +free_rx_skbuff: + kfree(priv->rx_skbuff); +free_ucc_pram: + qe_muram_free(priv->ucc_pram_offset); +free_tx_bd: + dma_free_coherent(priv->dev, + TX_BD_RING_LEN * sizeof(struct qe_bd), + priv->tx_bd_base, priv->dma_tx_bd); +free_rx_bd: + dma_free_coherent(priv->dev, + RX_BD_RING_LEN * sizeof(struct qe_bd), + priv->rx_bd_base, priv->dma_rx_bd); +free_uccf: + 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 *bd; + u16 bd_status; + unsigned long flags; + __be16 *proto_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 = (__be16 *)skb->data; + *proto_head = htons(DEFAULT_HDLC_HEAD); + + dev->stats.tx_bytes += skb->len; + break; + + case ARPHRD_PPP: + proto_head = (__be16 *)skb->data; + if (*proto_head != htons(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; + + case ARPHRD_ETHER: + dev->stats.tx_bytes += skb->len; + break; + + default: + dev->stats.tx_dropped++; + dev_kfree_skb(skb); + return -ENOMEM; + } + netdev_sent_queue(dev, skb->len); + spin_lock_irqsave(&priv->lock, flags); + + dma_rmb(); + /* Start from the next BD that should be filled */ + bd = priv->curtx_bd; + bd_status = be16_to_cpu(bd->status); + /* 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_S) | T_R_S | T_I_S | T_L_S | T_TC_S; + + bd->length = cpu_to_be16(skb->len); + bd->status = cpu_to_be16(bd_status); + + /* Move to next BD in the ring */ + if (!(bd_status & T_W_S)) + 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_restart(struct ucc_hdlc_private *priv) +{ + u32 cecr_subblock; + + cecr_subblock = + ucc_fast_get_qe_cr_subblock(priv->ut_info->uf_info.ucc_num); + + qe_issue_cmd(QE_RESTART_TX, cecr_subblock, + QE_CR_PROTOCOL_UNSPECIFIED, 0); + return 0; +} + +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; + unsigned int bytes_sent = 0; + int howmany = 0; + struct qe_bd *bd; /* BD pointer */ + u16 bd_status; + int tx_restart = 0; + + dma_rmb(); + bd = priv->dirty_tx; + bd_status = be16_to_cpu(bd->status); + + /* Normal processing. */ + while ((bd_status & T_R_S) == 0) { + struct sk_buff *skb; + + if (bd_status & T_UN_S) { /* Underrun */ + dev->stats.tx_fifo_errors++; + tx_restart = 1; + } + if (bd_status & T_CT_S) { /* Carrier lost */ + dev->stats.tx_carrier_errors++; + tx_restart = 1; + } + + /* 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; + howmany++; + bytes_sent += skb->len; + dev->stats.tx_packets++; + memset(priv->tx_buffer + + (be32_to_cpu(bd->buf) - priv->dma_tx_addr), + 0, skb->len); + dev_consume_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_S)) + bd += 1; + else + bd = priv->tx_bd_base; + bd_status = be16_to_cpu(bd->status); + } + priv->dirty_tx = bd; + + if (tx_restart) + hdlc_tx_restart(priv); + + netdev_completed_queue(dev, howmany, bytes_sent); + 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 = NULL; + hdlc_device *hdlc = dev_to_hdlc(dev); + struct qe_bd *bd; + u16 bd_status; + u16 length, howmany = 0; + u8 *bdbuffer; + + dma_rmb(); + bd = priv->currx_bd; + bd_status = be16_to_cpu(bd->status); + + /* while there are received buffers and BD is full (~R_E) */ + while (!((bd_status & (R_E_S)) || (--rx_work_limit < 0))) { + if (bd_status & (RX_BD_ERRORS)) { + dev->stats.rx_errors++; + + if (bd_status & R_CD_S) + dev->stats.collisions++; + if (bd_status & R_OV_S) + dev->stats.rx_fifo_errors++; + if (bd_status & R_CR_S) + dev->stats.rx_crc_errors++; + if (bd_status & R_AB_S) + dev->stats.rx_over_errors++; + if (bd_status & R_NO_S) + dev->stats.rx_frame_errors++; + if (bd_status & R_LG_S) + dev->stats.rx_length_errors++; + + goto recycle; + } + bdbuffer = priv->rx_buffer + + (priv->currx_bdnum * MAX_RX_BUF_LENGTH); + length = be16_to_cpu(bd->length); + + 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: + case ARPHRD_ETHER: + 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); + netif_receive_skb(skb); + +recycle: + bd->status = cpu_to_be16((bd_status & R_W_S) | R_E_S | R_I_S); + + /* update to point at the next bd */ + if (bd_status & R_W_S) { + 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 = be16_to_cpu(bd->status); + } + dma_rmb(); + + 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_done(napi, howmany); + qe_setbits_be32(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; + u32 ucce; + u32 uccm; + + uccf = priv->uccf; + + ucce = ioread32be(uccf->p_ucce); + uccm = ioread32be(uccf->p_uccm); + ucce &= uccm; + iowrite32be(ucce, uccf->p_ucce); + if (!ucce) + return IRQ_NONE; + + 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_missed_errors++; + if (ucce >> 16 & UCC_HDLC_UCCE_TXE) + dev->stats.tx_errors++; + + return IRQ_HANDLED; +} + +static int uhdlc_ioctl(struct net_device *dev, struct if_settings *ifs) +{ + const size_t size = sizeof(te1_settings); + te1_settings line; + struct ucc_hdlc_private *priv = netdev_priv(dev); + + switch (ifs->type) { + case IF_GET_IFACE: + ifs->type = IF_IFACE_E1; + if (ifs->size < size) { + ifs->size = size; /* data size wanted */ + return -ENOBUFS; + } + memset(&line, 0, sizeof(line)); + line.clock_type = priv->clocking; + + if (copy_to_user(ifs->ifs_ifsu.sync, &line, size)) + return -EFAULT; + return 0; + + default: + return hdlc_ioctl(dev, ifs); + } +} + +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; + int rc = 0; + + if (priv->hdlc_busy != 1) { + if (request_irq(priv->ut_info->uf_info.irq, + ucc_hdlc_irq_handler, 0, "hdlc", priv)) + 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, + QE_CR_PROTOCOL_UNSPECIFIED, 0); + + ucc_fast_enable(priv->uccf, COMM_DIR_RX | COMM_DIR_TX); + + /* Enable the TDM port */ + if (priv->tsa) + qe_setbits_8(&utdm->si_regs->siglmr1_h, 0x1 << utdm->tdm_port); + + priv->hdlc_busy = 1; + netif_device_attach(priv->ndev); + napi_enable(&priv->napi); + netdev_reset_queue(dev); + netif_start_queue(dev); + + rc = hdlc_open(dev); + if (rc) + uhdlc_close(dev); + } + + return rc; +} + +static void uhdlc_memclean(struct ucc_hdlc_private *priv) +{ + qe_muram_free(ioread16be(&priv->ucc_pram->riptr)); + qe_muram_free(ioread16be(&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) + qe_clrbits_8(&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); + netdev_reset_queue(dev); + priv->hdlc_busy = 0; + + hdlc_close(dev); + + 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_PR0_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 __iomem *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 __iomem *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_fast __iomem *uf_regs; + + if (!priv) + return -EINVAL; + + if (!netif_running(priv->ndev)) + return 0; + + netif_device_detach(priv->ndev); + napi_disable(&priv->napi); + + 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); + + return 0; +} + +static int uhdlc_resume(struct device *dev) +{ + struct ucc_hdlc_private *priv = dev_get_drvdata(dev); + struct ucc_tdm *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 i; + u32 cecr_subblock; + u16 bd_status; + + if (!priv) + return -EINVAL; + + if (!netif_running(priv->ndev)) + return 0; + + utdm = priv->utdm; + 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); + 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); + 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_S | R_I_S; + else + bd_status = R_E_S | R_I_S | R_W_S; + + priv->rx_bd_base[i].status = cpu_to_be16(bd_status); + priv->rx_bd_base[i].buf = cpu_to_be32(priv->dma_rx_addr + i * MAX_RX_BUF_LENGTH); + } + + for (i = 0; i < TX_BD_RING_LEN; i++) { + if (i < (TX_BD_RING_LEN - 1)) + bd_status = T_I_S | T_TC_S; + else + bd_status = T_I_S | T_TC_S | T_W_S; + + priv->tx_bd_base[i].status = cpu_to_be16(bd_status); + priv->tx_bd_base[i].buf = cpu_to_be32(priv->dma_tx_addr + i * MAX_RX_BUF_LENGTH); + } + dma_wmb(); + + /* 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) + qe_setbits_8(&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 void uhdlc_tx_timeout(struct net_device *ndev, unsigned int txqueue) +{ + netdev_err(ndev, "%s\n", __func__); +} + +static const struct net_device_ops uhdlc_ops = { + .ndo_open = uhdlc_open, + .ndo_stop = uhdlc_close, + .ndo_start_xmit = hdlc_start_xmit, + .ndo_siocwandev = uhdlc_ioctl, + .ndo_tx_timeout = uhdlc_tx_timeout, +}; + +static int hdlc_map_iomem(char *name, int init_flag, void __iomem **ptr) +{ + struct device_node *np; + struct platform_device *pdev; + struct resource *res; + static int siram_init_flag; + int ret = 0; + + np = of_find_compatible_node(NULL, NULL, name); + if (!np) + return -EINVAL; + + pdev = of_find_device_by_node(np); + if (!pdev) { + pr_err("%pOFn: failed to lookup pdev\n", np); + of_node_put(np); + return -EINVAL; + } + + of_node_put(np); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + ret = -EINVAL; + goto error_put_device; + } + *ptr = ioremap(res->start, resource_size(res)); + if (!*ptr) { + ret = -ENOMEM; + goto error_put_device; + } + + /* We've remapped the addresses, and we don't need the device any + * more, so we should release it. + */ + put_device(&pdev->dev); + + if (init_flag && siram_init_flag == 0) { + memset_io(*ptr, 0, resource_size(res)); + siram_init_flag = 1; + } + return 0; + +error_put_device: + put_device(&pdev->dev); + + return ret; +} + +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 = NULL; + 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 > (UCC_MAX_NUM - 1) || 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; + } + + 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) + return -ENOMEM; + + 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 (of_get_property(np, "fsl,hdlc-bus", NULL)) + uhdlc_priv->hdlc_bus = 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 free_uhdlc_priv; + } + uhdlc_priv->utdm = utdm; + ret = ucc_of_parse_tdm(np, utdm, ut_info); + if (ret) + goto free_utdm; + + ret = hdlc_map_iomem("fsl,t1040-qe-si", 0, + (void __iomem **)&utdm->si_regs); + if (ret) + goto free_utdm; + ret = hdlc_map_iomem("fsl,t1040-qe-siram", 1, + (void __iomem **)&utdm->siram); + if (ret) + goto unmap_si_regs; + } + + if (of_property_read_u16(np, "fsl,hmask", &uhdlc_priv->hmask)) + uhdlc_priv->hmask = DEFAULT_ADDR_MASK; + + ret = uhdlc_init(uhdlc_priv); + if (ret) { + dev_err(&pdev->dev, "Failed to init uhdlc\n"); + goto undo_uhdlc_init; + } + + dev = alloc_hdlcdev(uhdlc_priv); + if (!dev) { + ret = -ENOMEM; + pr_err("ucc_hdlc: unable to allocate memory\n"); + goto undo_uhdlc_init; + } + + uhdlc_priv->ndev = dev; + hdlc = dev_to_hdlc(dev); + dev->tx_queue_len = 16; + dev->netdev_ops = &uhdlc_ops; + dev->watchdog_timeo = 2 * HZ; + hdlc->attach = ucc_hdlc_attach; + hdlc->xmit = ucc_hdlc_tx; + netif_napi_add_weight(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"); + goto free_dev; + } + + return 0; + +free_dev: + free_netdev(dev); +undo_uhdlc_init: + if (utdm) + iounmap(utdm->siram); +unmap_si_regs: + if (utdm) + iounmap(utdm->si_regs); +free_utdm: + if (uhdlc_priv->tsa) + kfree(utdm); +free_uhdlc_priv: + kfree(uhdlc_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 = { + .name = DRV_NAME, + .pm = HDLC_PM_OPS, + .of_match_table = fsl_ucc_hdlc_of_match, + }, +}; + +module_platform_driver(ucc_hdlc_driver); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION(DRV_DESC); |