--- /dev/null
+/*
+ * 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);
+
+#if defined(CONFIG_XILINX_440) || defined(CONFIG_XILINX_405)
+
+/*
+ * Indirect DCR access operations mi{ft}dcr_xilinx() espacialy
+ * for Xilinx PowerPC implementations on FPGA.
+ *
+ * FIXME: This part should go up to arch/powerpc -- but where?
+ */
+#include <asm/processor.h>
+#define XILINX_INDIRECT_DCR_ADDRESS_REG 0
+#define XILINX_INDIRECT_DCR_ACCESS_REG 1
+inline unsigned mifdcr_xilinx(const unsigned dcrn)
+{
+ mtdcr(XILINX_INDIRECT_DCR_ADDRESS_REG, dcrn);
+ return mfdcr(XILINX_INDIRECT_DCR_ACCESS_REG);
+}
+inline void mitdcr_xilinx(const unsigned dcrn, int val)
+{
+ mtdcr(XILINX_INDIRECT_DCR_ADDRESS_REG, dcrn);
+ mtdcr(XILINX_INDIRECT_DCR_ACCESS_REG, val);
+}
+
+/* Xilinx Device Control Register (DCR) in/out accessors */
+inline unsigned ll_temac_xldcr_in32(phys_addr_t addr)
+{
+ return mifdcr_xilinx((const unsigned)addr);
+}
+inline void ll_temac_xldcr_out32(phys_addr_t addr, unsigned value)
+{
+ mitdcr_xilinx((const unsigned)addr, value);
+}
+
+void ll_temac_collect_xldcr_sdma_reg_addr(struct eth_device *dev)
+{
+ struct ll_temac *ll_temac = dev->priv;
+ phys_addr_t dmac_ctrl = ll_temac->ctrladdr;
+ phys_addr_t *ra = ll_temac->sdma_reg_addr;
+
+ ra[TX_NXTDESC_PTR] = dmac_ctrl + TX_NXTDESC_PTR;
+ ra[TX_CURBUF_ADDR] = dmac_ctrl + TX_CURBUF_ADDR;
+ ra[TX_CURBUF_LENGTH] = dmac_ctrl + TX_CURBUF_LENGTH;
+ ra[TX_CURDESC_PTR] = dmac_ctrl + TX_CURDESC_PTR;
+ ra[TX_TAILDESC_PTR] = dmac_ctrl + TX_TAILDESC_PTR;
+ ra[TX_CHNL_CTRL] = dmac_ctrl + TX_CHNL_CTRL;
+ ra[TX_IRQ_REG] = dmac_ctrl + TX_IRQ_REG;
+ ra[TX_CHNL_STS] = dmac_ctrl + TX_CHNL_STS;
+ ra[RX_NXTDESC_PTR] = dmac_ctrl + RX_NXTDESC_PTR;
+ ra[RX_CURBUF_ADDR] = dmac_ctrl + RX_CURBUF_ADDR;
+ ra[RX_CURBUF_LENGTH] = dmac_ctrl + RX_CURBUF_LENGTH;
+ ra[RX_CURDESC_PTR] = dmac_ctrl + RX_CURDESC_PTR;
+ ra[RX_TAILDESC_PTR] = dmac_ctrl + RX_TAILDESC_PTR;
+ ra[RX_CHNL_CTRL] = dmac_ctrl + RX_CHNL_CTRL;
+ ra[RX_IRQ_REG] = dmac_ctrl + RX_IRQ_REG;
+ ra[RX_CHNL_STS] = dmac_ctrl + RX_CHNL_STS;
+ ra[DMA_CONTROL_REG] = dmac_ctrl + DMA_CONTROL_REG;
+}
+
+#endif /* CONFIG_XILINX_440 || ONFIG_XILINX_405 */
+
+/* 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 *)NetRxPackets[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)
+ NetReceive(NetRxPackets[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;
+}
Code Review / kvmfornfv.git / blobdiff