/* * Xilinx xps_ll_temac ethernet driver for u-boot * * SDMA sub-controller * * Copyright (C) 2011 - 2012 Stephan Linz <linz@li-pro.net> * Copyright (C) 2008 - 2011 Michal Simek <monstr@monstr.eu> * Copyright (C) 2008 - 2011 PetaLogix * * Based on Yoshio Kashiwagi kashiwagi@co-nss.co.jp driver * Copyright (C) 2008 Nissin Systems Co.,Ltd. * March 2008 created * * CREDITS: tsec driver * * SPDX-License-Identifier: GPL-2.0+ * * [0]: http://www.xilinx.com/support/documentation * * [M]: [0]/ip_documentation/mpmc.pdf * [S]: [0]/ip_documentation/xps_ll_temac.pdf * [A]: [0]/application_notes/xapp1041.pdf */ #include <config.h> #include <common.h> #include <net.h> #include <asm/types.h> #include <asm/io.h> #include "xilinx_ll_temac.h" #include "xilinx_ll_temac_sdma.h" #define TX_BUF_CNT 2 static unsigned int rx_idx; /* index of the current RX buffer */ static unsigned int tx_idx; /* index of the current TX buffer */ struct rtx_cdmac_bd { struct cdmac_bd rx[PKTBUFSRX]; struct cdmac_bd tx[TX_BUF_CNT]; }; /* * DMA Buffer Descriptor alignment * * If the address contained in the Next Descriptor Pointer register is not * 8-word aligned or reaches beyond the range of available memory, the SDMA * halts processing and sets the CDMAC_BD_STCTRL_ERROR bit in the respective * status register (tx_chnl_sts or rx_chnl_sts). * * [1]: [0]/ip_documentation/mpmc.pdf * page 161, Next Descriptor Pointer */ static struct rtx_cdmac_bd cdmac_bd __aligned(32); /* Xilinx Processor Local Bus (PLB) in/out accessors */ inline unsigned ll_temac_xlplb_in32(phys_addr_t addr) { return in_be32((void *)addr); } inline void ll_temac_xlplb_out32(phys_addr_t addr, unsigned value) { out_be32((void *)addr, value); } /* collect all register addresses for Xilinx PLB in/out accessors */ void ll_temac_collect_xlplb_sdma_reg_addr(struct eth_device *dev) { struct ll_temac *ll_temac = dev->priv; struct sdma_ctrl *sdma_ctrl = (void *)ll_temac->ctrladdr; phys_addr_t *ra = ll_temac->sdma_reg_addr; ra[TX_NXTDESC_PTR] = (phys_addr_t)&sdma_ctrl->tx_nxtdesc_ptr; ra[TX_CURBUF_ADDR] = (phys_addr_t)&sdma_ctrl->tx_curbuf_addr; ra[TX_CURBUF_LENGTH] = (phys_addr_t)&sdma_ctrl->tx_curbuf_length; ra[TX_CURDESC_PTR] = (phys_addr_t)&sdma_ctrl->tx_curdesc_ptr; ra[TX_TAILDESC_PTR] = (phys_addr_t)&sdma_ctrl->tx_taildesc_ptr; ra[TX_CHNL_CTRL] = (phys_addr_t)&sdma_ctrl->tx_chnl_ctrl; ra[TX_IRQ_REG] = (phys_addr_t)&sdma_ctrl->tx_irq_reg; ra[TX_CHNL_STS] = (phys_addr_t)&sdma_ctrl->tx_chnl_sts; ra[RX_NXTDESC_PTR] = (phys_addr_t)&sdma_ctrl->rx_nxtdesc_ptr; ra[RX_CURBUF_ADDR] = (phys_addr_t)&sdma_ctrl->rx_curbuf_addr; ra[RX_CURBUF_LENGTH] = (phys_addr_t)&sdma_ctrl->rx_curbuf_length; ra[RX_CURDESC_PTR] = (phys_addr_t)&sdma_ctrl->rx_curdesc_ptr; ra[RX_TAILDESC_PTR] = (phys_addr_t)&sdma_ctrl->rx_taildesc_ptr; ra[RX_CHNL_CTRL] = (phys_addr_t)&sdma_ctrl->rx_chnl_ctrl; ra[RX_IRQ_REG] = (phys_addr_t)&sdma_ctrl->rx_irq_reg; ra[RX_CHNL_STS] = (phys_addr_t)&sdma_ctrl->rx_chnl_sts; ra[DMA_CONTROL_REG] = (phys_addr_t)&sdma_ctrl->dma_control_reg; } /* Check for TX and RX channel errors. */ static inline int ll_temac_sdma_error(struct eth_device *dev) { int err; struct ll_temac *ll_temac = dev->priv; phys_addr_t *ra = ll_temac->sdma_reg_addr; err = ll_temac->in32(ra[TX_CHNL_STS]) & CHNL_STS_ERROR; err |= ll_temac->in32(ra[RX_CHNL_STS]) & CHNL_STS_ERROR; return err; } int ll_temac_init_sdma(struct eth_device *dev) { struct ll_temac *ll_temac = dev->priv; struct cdmac_bd *rx_dp; struct cdmac_bd *tx_dp; phys_addr_t *ra = ll_temac->sdma_reg_addr; int i; printf("%s: SDMA: %d Rx buffers, %d Tx buffers\n", dev->name, PKTBUFSRX, TX_BUF_CNT); /* Initialize the Rx Buffer descriptors */ for (i = 0; i < PKTBUFSRX; i++) { rx_dp = &cdmac_bd.rx[i]; memset(rx_dp, 0, sizeof(*rx_dp)); rx_dp->next_p = rx_dp; rx_dp->buf_len = PKTSIZE_ALIGN; rx_dp->phys_buf_p = (u8 *)net_rx_packets[i]; flush_cache((u32)rx_dp->phys_buf_p, PKTSIZE_ALIGN); } flush_cache((u32)cdmac_bd.rx, sizeof(cdmac_bd.rx)); /* Initialize the TX Buffer Descriptors */ for (i = 0; i < TX_BUF_CNT; i++) { tx_dp = &cdmac_bd.tx[i]; memset(tx_dp, 0, sizeof(*tx_dp)); tx_dp->next_p = tx_dp; } flush_cache((u32)cdmac_bd.tx, sizeof(cdmac_bd.tx)); /* Reset index counter to the Rx and Tx Buffer descriptors */ rx_idx = tx_idx = 0; /* initial Rx DMA start by writing to respective TAILDESC_PTR */ ll_temac->out32(ra[RX_CURDESC_PTR], (int)&cdmac_bd.rx[rx_idx]); ll_temac->out32(ra[RX_TAILDESC_PTR], (int)&cdmac_bd.rx[rx_idx]); return 0; } int ll_temac_halt_sdma(struct eth_device *dev) { unsigned timeout = 50; /* 1usec * 50 = 50usec */ struct ll_temac *ll_temac = dev->priv; phys_addr_t *ra = ll_temac->sdma_reg_addr; /* * Soft reset the DMA * * Quote from MPMC documentation: Writing a 1 to this field * forces the DMA engine to shutdown and reset itself. After * setting this bit, software must poll it until the bit is * cleared by the DMA. This indicates that the reset process * is done and the pipeline has been flushed. */ ll_temac->out32(ra[DMA_CONTROL_REG], DMA_CONTROL_RESET); while (timeout && (ll_temac->in32(ra[DMA_CONTROL_REG]) & DMA_CONTROL_RESET)) { timeout--; udelay(1); } if (!timeout) { printf("%s: Timeout\n", __func__); return -1; } return 0; } int ll_temac_reset_sdma(struct eth_device *dev) { u32 r; struct ll_temac *ll_temac = dev->priv; phys_addr_t *ra = ll_temac->sdma_reg_addr; /* Soft reset the DMA. */ if (ll_temac_halt_sdma(dev)) return -1; /* Now clear the interrupts. */ r = ll_temac->in32(ra[TX_CHNL_CTRL]); r &= ~CHNL_CTRL_IRQ_MASK; ll_temac->out32(ra[TX_CHNL_CTRL], r); r = ll_temac->in32(ra[RX_CHNL_CTRL]); r &= ~CHNL_CTRL_IRQ_MASK; ll_temac->out32(ra[RX_CHNL_CTRL], r); /* Now ACK pending IRQs. */ ll_temac->out32(ra[TX_IRQ_REG], IRQ_REG_IRQ_MASK); ll_temac->out32(ra[RX_IRQ_REG], IRQ_REG_IRQ_MASK); /* Set tail-ptr mode, disable errors for both channels. */ ll_temac->out32(ra[DMA_CONTROL_REG], /* Enable use of tail pointer register */ DMA_CONTROL_TPE | /* Disable error when 2 or 4 bit coalesce cnt overfl */ DMA_CONTROL_RXOCEID | /* Disable error when 2 or 4 bit coalesce cnt overfl */ DMA_CONTROL_TXOCEID); return 0; } int ll_temac_recv_sdma(struct eth_device *dev) { int length, pb_idx; struct cdmac_bd *rx_dp = &cdmac_bd.rx[rx_idx]; struct ll_temac *ll_temac = dev->priv; phys_addr_t *ra = ll_temac->sdma_reg_addr; if (ll_temac_sdma_error(dev)) { if (ll_temac_reset_sdma(dev)) return -1; ll_temac_init_sdma(dev); } flush_cache((u32)rx_dp, sizeof(*rx_dp)); if (!(rx_dp->sca.stctrl & CDMAC_BD_STCTRL_COMPLETED)) return 0; if (rx_dp->sca.stctrl & (CDMAC_BD_STCTRL_SOP | CDMAC_BD_STCTRL_EOP)) { pb_idx = rx_idx; length = rx_dp->sca.app[4] & CDMAC_BD_APP4_RXBYTECNT_MASK; } else { pb_idx = -1; length = 0; printf("%s: Got part of package, unsupported (%x)\n", __func__, rx_dp->sca.stctrl); } /* flip the buffer */ flush_cache((u32)rx_dp->phys_buf_p, length); /* reset the current descriptor */ rx_dp->sca.stctrl = 0; rx_dp->sca.app[4] = 0; flush_cache((u32)rx_dp, sizeof(*rx_dp)); /* Find next empty buffer descriptor, preparation for next iteration */ rx_idx = (rx_idx + 1) % PKTBUFSRX; rx_dp = &cdmac_bd.rx[rx_idx]; flush_cache((u32)rx_dp, sizeof(*rx_dp)); /* DMA start by writing to respective TAILDESC_PTR */ ll_temac->out32(ra[RX_CURDESC_PTR], (int)&cdmac_bd.rx[rx_idx]); ll_temac->out32(ra[RX_TAILDESC_PTR], (int)&cdmac_bd.rx[rx_idx]); if (length > 0 && pb_idx != -1) net_process_received_packet(net_rx_packets[pb_idx], length); return 0; } int ll_temac_send_sdma(struct eth_device *dev, void *packet, int length) { unsigned timeout = 50; /* 1usec * 50 = 50usec */ struct cdmac_bd *tx_dp = &cdmac_bd.tx[tx_idx]; struct ll_temac *ll_temac = dev->priv; phys_addr_t *ra = ll_temac->sdma_reg_addr; if (ll_temac_sdma_error(dev)) { if (ll_temac_reset_sdma(dev)) return -1; ll_temac_init_sdma(dev); } tx_dp->phys_buf_p = (u8 *)packet; tx_dp->buf_len = length; tx_dp->sca.stctrl = CDMAC_BD_STCTRL_SOP | CDMAC_BD_STCTRL_EOP | CDMAC_BD_STCTRL_STOP_ON_END; flush_cache((u32)packet, length); flush_cache((u32)tx_dp, sizeof(*tx_dp)); /* DMA start by writing to respective TAILDESC_PTR */ ll_temac->out32(ra[TX_CURDESC_PTR], (int)tx_dp); ll_temac->out32(ra[TX_TAILDESC_PTR], (int)tx_dp); /* Find next empty buffer descriptor, preparation for next iteration */ tx_idx = (tx_idx + 1) % TX_BUF_CNT; tx_dp = &cdmac_bd.tx[tx_idx]; do { flush_cache((u32)tx_dp, sizeof(*tx_dp)); udelay(1); } while (timeout-- && !(tx_dp->sca.stctrl & CDMAC_BD_STCTRL_COMPLETED)); if (!timeout) { printf("%s: Timeout\n", __func__); return -1; } return 0; }