drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*******************************************************************************
   3   This is the driver for the MAC 10/100 on-chip Ethernet controller
   4   currently tested on all the ST boards based on STb7109 and stx7200 SoCs.
   5
   6   DWC Ether MAC 10/100 Universal version 4.0 has been used for developing
   7   this code.
   8
   9   This contains the functions to handle the dma.
  10
  11   Copyright (C) 2007-2009  STMicroelectronics Ltd
  12
  13
  14   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
  15 *******************************************************************************/
  16
  17 #include <asm/io.h>
  18 #include "dwmac100.h"
  19 #include "dwmac_dma.h"
  20
  21 static void dwmac100_dma_init(void __iomem *ioaddr,
  22                               struct stmmac_dma_cfg *dma_cfg, int atds)
  23 {
  24         /* Enable Application Access by writing to DMA CSR0 */
  25         writel(DMA_BUS_MODE_DEFAULT | (dma_cfg->pbl << DMA_BUS_MODE_PBL_SHIFT),
  26                ioaddr + DMA_BUS_MODE);
  27
  28         /* Mask interrupts by writing to CSR7 */
  29         writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
  30 }
  31
  32 static void dwmac100_dma_init_rx(void __iomem *ioaddr,
  33                                  struct stmmac_dma_cfg *dma_cfg,
  34                                  dma_addr_t dma_rx_phy, u32 chan)
  35 {
  36         /* RX descriptor base addr lists must be written into DMA CSR3 */
  37         writel(lower_32_bits(dma_rx_phy), ioaddr + DMA_RCV_BASE_ADDR);
  38 }
  39
  40 static void dwmac100_dma_init_tx(void __iomem *ioaddr,
  41                                  struct stmmac_dma_cfg *dma_cfg,
  42                                  dma_addr_t dma_tx_phy, u32 chan)
  43 {
  44         /* TX descriptor base addr lists must be written into DMA CSR4 */
  45         writel(lower_32_bits(dma_tx_phy), ioaddr + DMA_TX_BASE_ADDR);
  46 }
  47
  48 /* Store and Forward capability is not used at all.
  49  *
  50  * The transmit threshold can be programmed by setting the TTC bits in the DMA
  51  * control register.
  52  */
  53 static void dwmac100_dma_operation_mode_tx(void __iomem *ioaddr, int mode,
  54                                            u32 channel, int fifosz, u8 qmode)
  55 {
  56         u32 csr6 = readl(ioaddr + DMA_CONTROL);
  57
  58         if (mode <= 32)
  59                 csr6 |= DMA_CONTROL_TTC_32;
  60         else if (mode <= 64)
  61                 csr6 |= DMA_CONTROL_TTC_64;
  62         else
  63                 csr6 |= DMA_CONTROL_TTC_128;
  64
  65         writel(csr6, ioaddr + DMA_CONTROL);
  66 }
  67
  68 static void dwmac100_dump_dma_regs(void __iomem *ioaddr, u32 *reg_space)
  69 {
  70         int i;
  71
  72         for (i = 0; i < NUM_DWMAC100_DMA_REGS; i++)
  73                 reg_space[DMA_BUS_MODE / 4 + i] =
  74                         readl(ioaddr + DMA_BUS_MODE + i * 4);
  75
  76         reg_space[DMA_CUR_TX_BUF_ADDR / 4] =
  77                 readl(ioaddr + DMA_CUR_TX_BUF_ADDR);
  78         reg_space[DMA_CUR_RX_BUF_ADDR / 4] =
  79                 readl(ioaddr + DMA_CUR_RX_BUF_ADDR);
  80 }
  81
  82 /* DMA controller has two counters to track the number of the missed frames. */
  83 static void dwmac100_dma_diagnostic_fr(void *data, struct stmmac_extra_stats *x,
  84                                        void __iomem *ioaddr)
  85 {
  86         struct net_device_stats *stats = (struct net_device_stats *)data;
  87         u32 csr8 = readl(ioaddr + DMA_MISSED_FRAME_CTR);
  88
  89         if (unlikely(csr8)) {
  90                 if (csr8 & DMA_MISSED_FRAME_OVE) {
  91                         stats->rx_over_errors += 0x800;
  92                         x->rx_overflow_cntr += 0x800;
  93                 } else {
  94                         unsigned int ove_cntr;
  95                         ove_cntr = ((csr8 & DMA_MISSED_FRAME_OVE_CNTR) >> 17);
  96                         stats->rx_over_errors += ove_cntr;
  97                         x->rx_overflow_cntr += ove_cntr;
  98                 }
  99
 100                 if (csr8 & DMA_MISSED_FRAME_OVE_M) {
 101                         stats->rx_missed_errors += 0xffff;
 102                         x->rx_missed_cntr += 0xffff;
 103                 } else {
 104                         unsigned int miss_f = (csr8 & DMA_MISSED_FRAME_M_CNTR);
 105                         stats->rx_missed_errors += miss_f;
 106                         x->rx_missed_cntr += miss_f;
 107                 }
 108         }
 109 }
 110
 111 const struct stmmac_dma_ops dwmac100_dma_ops = {
 112         .reset = dwmac_dma_reset,
 113         .init = dwmac100_dma_init,
 114         .init_rx_chan = dwmac100_dma_init_rx,
 115         .init_tx_chan = dwmac100_dma_init_tx,
 116         .dump_regs = dwmac100_dump_dma_regs,
 117         .dma_tx_mode = dwmac100_dma_operation_mode_tx,
 118         .dma_diagnostic_fr = dwmac100_dma_diagnostic_fr,
 119         .enable_dma_transmission = dwmac_enable_dma_transmission,
 120         .enable_dma_irq = dwmac_enable_dma_irq,
 121         .disable_dma_irq = dwmac_disable_dma_irq,
 122         .start_tx = dwmac_dma_start_tx,
 123         .stop_tx = dwmac_dma_stop_tx,
 124         .start_rx = dwmac_dma_start_rx,
 125         .stop_rx = dwmac_dma_stop_rx,
 126         .dma_interrupt = dwmac_dma_interrupt,
 127 };