The Modular Scatter-Gather DMA core is a new DMA core to work with the Altera Triple-Speed Ethernet MegaCore. It replaces the legacy Scatter-Gather Direct Memory Access (SG-DMA) controller core. Please find details on the "Embedded Peripherals IP User Guide" of Altera.
Signed-off-by: Thomas Chou thomas@wytron.com.tw --- drivers/net/altera_tse.c | 131 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/net/altera_tse.h | 60 ++++++++++++++++++++++ 2 files changed, 191 insertions(+)
diff --git a/drivers/net/altera_tse.c b/drivers/net/altera_tse.c index 3848530..5692fe9 100644 --- a/drivers/net/altera_tse.c +++ b/drivers/net/altera_tse.c @@ -263,6 +263,121 @@ static void altera_tse_stop_sgdma(struct udevice *dev) &tx_sgdma->control); }
+static void msgdma_reset(struct msgdma_csr *csr) +{ + u32 status; + ulong ctime; + + /* Reset mSGDMA */ + writel(MSGDMA_CSR_STAT_MASK, &csr->status); + writel(MSGDMA_CSR_CTL_RESET, &csr->control); + ctime = get_timer(0); + while (1) { + status = readl(&csr->status); + if (!(status & MSGDMA_CSR_STAT_RESETTING)) + break; + if (get_timer(ctime) > ALT_TSE_SW_RESET_TIMEOUT) { + debug("Reset msgdma timeout\n"); + break; + } + } + /* Clear status */ + writel(MSGDMA_CSR_STAT_MASK, &csr->status); +} + +static u32 msgdma_wait(struct msgdma_csr *csr) +{ + u32 status; + ulong ctime; + + /* Wait for the descriptor to complete */ + ctime = get_timer(0); + while (1) { + status = readl(&csr->status); + if (!(status & MSGDMA_CSR_STAT_BUSY)) + break; + if (get_timer(ctime) > ALT_TSE_SGDMA_BUSY_TIMEOUT) { + debug("sgdma timeout\n"); + break; + } + } + /* Clear status */ + writel(MSGDMA_CSR_STAT_MASK, &csr->status); + + return status; +} + +static int altera_tse_send_msgdma(struct udevice *dev, void *packet, + int length) +{ + struct altera_tse_priv *priv = dev_get_priv(dev); + struct msgdma_extended_desc *desc = priv->tx_desc; + u32 tx_buf = virt_to_phys(packet); + u32 status; + + writel(tx_buf, &desc->read_addr_lo); + writel(0, &desc->read_addr_hi); + writel(0, &desc->write_addr_lo); + writel(0, &desc->write_addr_hi); + writel(length, &desc->len); + writel(0, &desc->burst_seq_num); + writel(MSGDMA_DESC_TX_STRIDE, &desc->stride); + writel(MSGDMA_DESC_CTL_TX_SINGLE, &desc->control); + status = msgdma_wait(priv->sgdma_tx); + debug("sent %d bytes, status %08x\n", length, status); + + return 0; +} + +static int altera_tse_recv_msgdma(struct udevice *dev, int flags, + uchar **packetp) +{ + struct altera_tse_priv *priv = dev_get_priv(dev); + struct msgdma_csr *csr = priv->sgdma_rx; + struct msgdma_response *resp = priv->rx_resp; + u32 level, length, status; + + level = readl(&csr->resp_fill_level); + if (level & 0xffff) { + length = readl(&resp->bytes_transferred); + status = readl(&resp->status); + debug("recv %d bytes, status %08x\n", length, status); + *packetp = priv->rx_buf; + + return length; + } + + return -EAGAIN; +} + +static int altera_tse_free_pkt_msgdma(struct udevice *dev, uchar *packet, + int length) +{ + struct altera_tse_priv *priv = dev_get_priv(dev); + struct msgdma_extended_desc *desc = priv->rx_desc; + u32 rx_buf = virt_to_phys(priv->rx_buf); + + writel(0, &desc->read_addr_lo); + writel(0, &desc->read_addr_hi); + writel(rx_buf, &desc->write_addr_lo); + writel(0, &desc->write_addr_hi); + writel(PKTSIZE_ALIGN, &desc->len); + writel(0, &desc->burst_seq_num); + writel(MSGDMA_DESC_RX_STRIDE, &desc->stride); + writel(MSGDMA_DESC_CTL_RX_SINGLE, &desc->control); + debug("recv setup\n"); + + return 0; +} + +static void altera_tse_stop_msgdma(struct udevice *dev) +{ + struct altera_tse_priv *priv = dev_get_priv(dev); + + msgdma_reset(priv->sgdma_rx); + msgdma_reset(priv->sgdma_tx); +} + static int tse_mdio_read(struct mii_dev *bus, int addr, int devad, int reg) { struct altera_tse_priv *priv = bus->priv; @@ -449,6 +564,13 @@ static const struct tse_ops tse_sgdma_ops = { .stop = altera_tse_stop_sgdma, };
+static const struct tse_ops tse_msgdma_ops = { + .send = altera_tse_send_msgdma, + .recv = altera_tse_recv_msgdma, + .free_pkt = altera_tse_free_pkt_msgdma, + .stop = altera_tse_stop_msgdma, +}; + static int altera_tse_probe(struct udevice *dev) { struct eth_pdata *pdata = dev_get_platdata(dev); @@ -466,6 +588,8 @@ static int altera_tse_probe(struct udevice *dev) priv->dma_type = dev_get_driver_data(dev); if (priv->dma_type == ALT_SGDMA) priv->ops = &tse_sgdma_ops; + else + priv->ops = &tse_msgdma_ops; /* * decode regs. there are multiple reg tuples, and they need to * match with reg-names. @@ -490,8 +614,14 @@ static int altera_tse_probe(struct udevice *dev) priv->mac_dev = base; else if (strcmp(list, "rx_csr") == 0) priv->sgdma_rx = base; + else if (strcmp(list, "rx_desc") == 0) + priv->rx_desc = base; + else if (strcmp(list, "rx_resp") == 0) + priv->rx_resp = base; else if (strcmp(list, "tx_csr") == 0) priv->sgdma_tx = base; + else if (strcmp(list, "tx_desc") == 0) + priv->tx_desc = base; else if (strcmp(list, "s1") == 0) desc_mem = base; idx += addrc + sizec; @@ -567,6 +697,7 @@ static const struct eth_ops altera_tse_ops = { };
static const struct udevice_id altera_tse_ids[] = { + { .compatible = "altr,tse-msgdma-1.0", .data = ALT_MSGDMA }, { .compatible = "altr,tse-1.0", .data = ALT_SGDMA }, {} }; diff --git a/drivers/net/altera_tse.h b/drivers/net/altera_tse.h index fae2378..2b1af81 100644 --- a/drivers/net/altera_tse.h +++ b/drivers/net/altera_tse.h @@ -15,6 +15,7 @@
/* dma type */ #define ALT_SGDMA 0 +#define ALT_MSGDMA 1
/* SGDMA Stuff */ #define ALT_SGDMA_STATUS_BUSY_MSK BIT(4) @@ -87,6 +88,64 @@ struct alt_sgdma_registers { u32 descriptor_pad[3]; };
+/* mSGDMA Stuff */ + +/* mSGDMA extended descriptor format */ +struct msgdma_extended_desc { + u32 read_addr_lo; /* data buffer source address low bits */ + u32 write_addr_lo; /* data buffer destination address low bits */ + u32 len; + u32 burst_seq_num; + u32 stride; + u32 read_addr_hi; /* data buffer source address high bits */ + u32 write_addr_hi; /* data buffer destination address high bits */ + u32 control; /* characteristics of the transfer */ +}; + +/* mSGDMA descriptor control field bit definitions */ +#define MSGDMA_DESC_CTL_GEN_SOP BIT(8) +#define MSGDMA_DESC_CTL_GEN_EOP BIT(9) +#define MSGDMA_DESC_CTL_END_ON_EOP BIT(12) +#define MSGDMA_DESC_CTL_END_ON_LEN BIT(13) +#define MSGDMA_DESC_CTL_GO BIT(31) + +/* Tx buffer control flags */ +#define MSGDMA_DESC_CTL_TX_SINGLE (MSGDMA_DESC_CTL_GEN_SOP | \ + MSGDMA_DESC_CTL_GEN_EOP | \ + MSGDMA_DESC_CTL_GO) + +#define MSGDMA_DESC_CTL_RX_SINGLE (MSGDMA_DESC_CTL_END_ON_EOP | \ + MSGDMA_DESC_CTL_END_ON_LEN | \ + MSGDMA_DESC_CTL_GO) + +/* mSGDMA extended descriptor stride definitions */ +#define MSGDMA_DESC_TX_STRIDE 0x00010001 +#define MSGDMA_DESC_RX_STRIDE 0x00010001 + +/* mSGDMA dispatcher control and status register map */ +struct msgdma_csr { + u32 status; /* Read/Clear */ + u32 control; /* Read/Write */ + u32 rw_fill_level; + u32 resp_fill_level; /* bit 15:0 */ + u32 rw_seq_num; + u32 pad[3]; /* reserved */ +}; + +/* mSGDMA CSR status register bit definitions */ +#define MSGDMA_CSR_STAT_BUSY BIT(0) +#define MSGDMA_CSR_STAT_RESETTING BIT(6) +#define MSGDMA_CSR_STAT_MASK 0x3FF + +/* mSGDMA CSR control register bit definitions */ +#define MSGDMA_CSR_CTL_RESET BIT(1) + +/* mSGDMA response register map */ +struct msgdma_response { + u32 bytes_transferred; + u32 status; +}; + /* TSE Stuff */ #define ALTERA_TSE_CMD_TX_ENA_MSK BIT(0) #define ALTERA_TSE_CMD_RX_ENA_MSK BIT(1) @@ -159,6 +218,7 @@ struct altera_tse_priv { unsigned int tx_fifo_depth; void *rx_desc; void *tx_desc; + void *rx_resp; unsigned char *rx_buf; unsigned int phyaddr; unsigned int interface;