drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2007-2015  STMicroelectronics Ltd
   4  *
   5  * Author: Alexandre Torgue <alexandre.torgue@st.com>
   6  */
   7
   8 #include <linux/io.h>
   9 #include <linux/iopoll.h>
  10 #include <linux/delay.h>
  11 #include "common.h"
  12 #include "dwmac4_dma.h"
  13 #include "dwmac4.h"
  14 #include "stmmac.h"
  15
  16 int dwmac4_dma_reset(void __iomem *ioaddr)
  17 {
  18         u32 value = readl(ioaddr + DMA_BUS_MODE);
  19
  20         /* DMA SW reset */
  21         value |= DMA_BUS_MODE_SFT_RESET;
  22         writel(value, ioaddr + DMA_BUS_MODE);
  23
  24         return readl_poll_timeout(ioaddr + DMA_BUS_MODE, value,
  25                                  !(value & DMA_BUS_MODE_SFT_RESET),
  26                                  10000, 1000000);
  27 }
  28
  29 void dwmac4_set_rx_tail_ptr(struct stmmac_priv *priv, void __iomem *ioaddr,
  30                             u32 tail_ptr, u32 chan)
  31 {
  32         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
  33
  34         writel(tail_ptr, ioaddr + DMA_CHAN_RX_END_ADDR(dwmac4_addrs, chan));
  35 }
  36
  37 void dwmac4_set_tx_tail_ptr(struct stmmac_priv *priv, void __iomem *ioaddr,
  38                             u32 tail_ptr, u32 chan)
  39 {
  40         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
  41
  42         writel(tail_ptr, ioaddr + DMA_CHAN_TX_END_ADDR(dwmac4_addrs, chan));
  43 }
  44
  45 void dwmac4_dma_start_tx(struct stmmac_priv *priv, void __iomem *ioaddr,
  46                          u32 chan)
  47 {
  48         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
  49         u32 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));
  50
  51         value |= DMA_CONTROL_ST;
  52         writel(value, ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));
  53
  54         value = readl(ioaddr + GMAC_CONFIG);
  55         value |= GMAC_CONFIG_TE;
  56         writel(value, ioaddr + GMAC_CONFIG);
  57 }
  58
  59 void dwmac4_dma_stop_tx(struct stmmac_priv *priv, void __iomem *ioaddr,
  60                         u32 chan)
  61 {
  62         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
  63
  64         u32 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));
  65
  66         value &= ~DMA_CONTROL_ST;
  67         writel(value, ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));
  68 }
  69
  70 void dwmac4_dma_start_rx(struct stmmac_priv *priv, void __iomem *ioaddr,
  71                          u32 chan)
  72 {
  73         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
  74
  75         u32 value = readl(ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));
  76
  77         value |= DMA_CONTROL_SR;
  78
  79         writel(value, ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));
  80
  81         value = readl(ioaddr + GMAC_CONFIG);
  82         value |= GMAC_CONFIG_RE;
  83         writel(value, ioaddr + GMAC_CONFIG);
  84 }
  85
  86 void dwmac4_dma_stop_rx(struct stmmac_priv *priv, void __iomem *ioaddr,
  87                         u32 chan)
  88 {
  89         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
  90         u32 value = readl(ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));
  91
  92         value &= ~DMA_CONTROL_SR;
  93         writel(value, ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));
  94 }
  95
  96 void dwmac4_set_tx_ring_len(struct stmmac_priv *priv, void __iomem *ioaddr,
  97                             u32 len, u32 chan)
  98 {
  99         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
 100
 101         writel(len, ioaddr + DMA_CHAN_TX_RING_LEN(dwmac4_addrs, chan));
 102 }
 103
 104 void dwmac4_set_rx_ring_len(struct stmmac_priv *priv, void __iomem *ioaddr,
 105                             u32 len, u32 chan)
 106 {
 107         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
 108
 109         writel(len, ioaddr + DMA_CHAN_RX_RING_LEN(dwmac4_addrs, chan));
 110 }
 111
 112 void dwmac4_enable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
 113                            u32 chan, bool rx, bool tx)
 114 {
 115         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
 116         u32 value = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
 117
 118         if (rx)
 119                 value |= DMA_CHAN_INTR_DEFAULT_RX;
 120         if (tx)
 121                 value |= DMA_CHAN_INTR_DEFAULT_TX;
 122
 123         writel(value, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
 124 }
 125
 126 void dwmac410_enable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
 127                              u32 chan, bool rx, bool tx)
 128 {
 129         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
 130         u32 value = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
 131
 132         if (rx)
 133                 value |= DMA_CHAN_INTR_DEFAULT_RX_4_10;
 134         if (tx)
 135                 value |= DMA_CHAN_INTR_DEFAULT_TX_4_10;
 136
 137         writel(value, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
 138 }
 139
 140 void dwmac4_disable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
 141                             u32 chan, bool rx, bool tx)
 142 {
 143         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
 144         u32 value = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
 145
 146         if (rx)
 147                 value &= ~DMA_CHAN_INTR_DEFAULT_RX;
 148         if (tx)
 149                 value &= ~DMA_CHAN_INTR_DEFAULT_TX;
 150
 151         writel(value, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
 152 }
 153
 154 void dwmac410_disable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
 155                               u32 chan, bool rx, bool tx)
 156 {
 157         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
 158         u32 value = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
 159
 160         if (rx)
 161                 value &= ~DMA_CHAN_INTR_DEFAULT_RX_4_10;
 162         if (tx)
 163                 value &= ~DMA_CHAN_INTR_DEFAULT_TX_4_10;
 164
 165         writel(value, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
 166 }
 167
 168 int dwmac4_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr,
 169                          struct stmmac_extra_stats *x, u32 chan, u32 dir)
 170 {
 171         const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
 172         u32 intr_status = readl(ioaddr + DMA_CHAN_STATUS(dwmac4_addrs, chan));
 173         u32 intr_en = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
 174         struct stmmac_rxq_stats *rxq_stats = &priv->xstats.rxq_stats[chan];
 175         struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[chan];
 176         int ret = 0;
 177
 178         if (dir == DMA_DIR_RX)
 179                 intr_status &= DMA_CHAN_STATUS_MSK_RX;
 180         else if (dir == DMA_DIR_TX)
 181                 intr_status &= DMA_CHAN_STATUS_MSK_TX;
 182
 183         /* ABNORMAL interrupts */
 184         if (unlikely(intr_status & DMA_CHAN_STATUS_AIS)) {
 185                 if (unlikely(intr_status & DMA_CHAN_STATUS_RBU))
 186                         x->rx_buf_unav_irq++;
 187                 if (unlikely(intr_status & DMA_CHAN_STATUS_RPS))
 188                         x->rx_process_stopped_irq++;
 189                 if (unlikely(intr_status & DMA_CHAN_STATUS_RWT))
 190                         x->rx_watchdog_irq++;
 191                 if (unlikely(intr_status & DMA_CHAN_STATUS_ETI))
 192                         x->tx_early_irq++;
 193                 if (unlikely(intr_status & DMA_CHAN_STATUS_TPS)) {
 194                         x->tx_process_stopped_irq++;
 195                         ret = tx_hard_error;
 196                 }
 197                 if (unlikely(intr_status & DMA_CHAN_STATUS_FBE)) {
 198                         x->fatal_bus_error_irq++;
 199                         ret = tx_hard_error;
 200                 }
 201         }
 202         /* TX/RX NORMAL interrupts */
 203         if (likely(intr_status & DMA_CHAN_STATUS_RI)) {
 204                 u64_stats_update_begin(&rxq_stats->syncp);
 205                 rxq_stats->rx_normal_irq_n++;
 206                 u64_stats_update_end(&rxq_stats->syncp);
 207                 ret |= handle_rx;
 208         }
 209         if (likely(intr_status & DMA_CHAN_STATUS_TI)) {
 210                 u64_stats_update_begin(&txq_stats->syncp);
 211                 txq_stats->tx_normal_irq_n++;
 212                 u64_stats_update_end(&txq_stats->syncp);
 213                 ret |= handle_tx;
 214         }
 215
 216         if (unlikely(intr_status & DMA_CHAN_STATUS_TBU))
 217                 ret |= handle_tx;
 218         if (unlikely(intr_status & DMA_CHAN_STATUS_ERI))
 219                 x->rx_early_irq++;
 220
 221         writel(intr_status & intr_en,
 222                ioaddr + DMA_CHAN_STATUS(dwmac4_addrs, chan));
 223         return ret;
 224 }
 225
 226 void stmmac_dwmac4_set_mac_addr(void __iomem *ioaddr, const u8 addr[6],
 227                                 unsigned int high, unsigned int low)
 228 {
 229         unsigned long data;
 230
 231         data = (addr[5] << 8) | addr[4];
 232         /* For MAC Addr registers se have to set the Address Enable (AE)
 233          * bit that has no effect on the High Reg 0 where the bit 31 (MO)
 234          * is RO.
 235          */
 236         data |= (STMMAC_CHAN0 << GMAC_HI_DCS_SHIFT);
 237         writel(data | GMAC_HI_REG_AE, ioaddr + high);
 238         data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
 239         writel(data, ioaddr + low);
 240 }
 241
 242 /* Enable disable MAC RX/TX */
 243 void stmmac_dwmac4_set_mac(void __iomem *ioaddr, bool enable)
 244 {
 245         u32 value = readl(ioaddr + GMAC_CONFIG);
 246         u32 old_val = value;
 247
 248         if (enable)
 249                 value |= GMAC_CONFIG_RE | GMAC_CONFIG_TE;
 250         else
 251                 value &= ~(GMAC_CONFIG_TE | GMAC_CONFIG_RE);
 252
 253         if (value != old_val)
 254                 writel(value, ioaddr + GMAC_CONFIG);
 255 }
 256
 257 void stmmac_dwmac4_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
 258                                 unsigned int high, unsigned int low)
 259 {
 260         unsigned int hi_addr, lo_addr;
 261
 262         /* Read the MAC address from the hardware */
 263         hi_addr = readl(ioaddr + high);
 264         lo_addr = readl(ioaddr + low);
 265
 266         /* Extract the MAC address from the high and low words */
 267         addr[0] = lo_addr & 0xff;
 268         addr[1] = (lo_addr >> 8) & 0xff;
 269         addr[2] = (lo_addr >> 16) & 0xff;
 270         addr[3] = (lo_addr >> 24) & 0xff;
 271         addr[4] = hi_addr & 0xff;
 272         addr[5] = (hi_addr >> 8) & 0xff;
 273 }