diff options
| -rw-r--r-- | drivers/net/wan/fsl_ucc_hdlc.c | 32 | ||||
| -rw-r--r-- | drivers/net/wan/fsl_ucc_hdlc.h | 1 | ||||
| -rw-r--r-- | include/soc/fsl/qe/qe.h | 5 |
3 files changed, 38 insertions, 0 deletions
diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c index 4c93d561b18a..e9b2d687f150 100644 --- a/drivers/net/wan/fsl_ucc_hdlc.c +++ b/drivers/net/wan/fsl_ucc_hdlc.c @@ -98,6 +98,13 @@ static int uhdlc_init(struct ucc_hdlc_private *priv) uf_info->tsa = 1; uf_info->ctsp = 1; } + + /* 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); @@ -135,6 +142,28 @@ static int uhdlc_init(struct ucc_hdlc_private *priv) /* 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 */ @@ -1046,6 +1075,9 @@ static int ucc_hdlc_probe(struct platform_device *pdev) 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) { diff --git a/drivers/net/wan/fsl_ucc_hdlc.h b/drivers/net/wan/fsl_ucc_hdlc.h index 881ecdeef076..c21134c1f180 100644 --- a/drivers/net/wan/fsl_ucc_hdlc.h +++ b/drivers/net/wan/fsl_ucc_hdlc.h @@ -78,6 +78,7 @@ struct ucc_hdlc_private { u16 tsa; bool hdlc_busy; bool loopback; + bool hdlc_bus; u8 *tx_buffer; u8 *rx_buffer; diff --git a/include/soc/fsl/qe/qe.h b/include/soc/fsl/qe/qe.h index 226f915a68c2..b3d1aff5e8ad 100644 --- a/include/soc/fsl/qe/qe.h +++ b/include/soc/fsl/qe/qe.h @@ -789,6 +789,11 @@ struct ucc_slow_pram { #define UCC_GETH_UPSMR_SMM 0x00000080 #define UCC_GETH_UPSMR_SGMM 0x00000020 +/* UCC Protocol Specific Mode Register (UPSMR), when used for HDLC */ +#define UCC_HDLC_UPSMR_RTE 0x02000000 +#define UCC_HDLC_UPSMR_BUS 0x00200000 +#define UCC_HDLC_UPSMR_CW8 0x00007000 + /* UCC Transmit On Demand Register (UTODR) */ #define UCC_SLOW_TOD 0x8000 #define UCC_FAST_TOD 0x8000 |