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