1 /* 2 * This is the driver for the GMAC on-chip Ethernet controller for ST SoCs. 3 * DWC Ether MAC version 4.xx has been used for developing this code. 4 * 5 * This contains the functions to handle the dma. 6 * 7 * Copyright (C) 2015 STMicroelectronics Ltd 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms and conditions of the GNU General Public License, 11 * version 2, as published by the Free Software Foundation. 12 * 13 * Author: Alexandre Torgue <alexandre.torgue@st.com> 14 */ 15 16 #include <linux/io.h> 17 #include "dwmac4.h" 18 #include "dwmac4_dma.h" 19 20 static void dwmac4_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi) 21 { 22 u32 value = readl(ioaddr + DMA_SYS_BUS_MODE); 23 int i; 24 25 pr_info("dwmac4: Master AXI performs %s burst length\n", 26 (value & DMA_SYS_BUS_FB) ? "fixed" : "any"); 27 28 if (axi->axi_lpi_en) 29 value |= DMA_AXI_EN_LPI; 30 if (axi->axi_xit_frm) 31 value |= DMA_AXI_LPI_XIT_FRM; 32 33 value &= ~DMA_AXI_WR_OSR_LMT; 34 value |= (axi->axi_wr_osr_lmt & DMA_AXI_OSR_MAX) << 35 DMA_AXI_WR_OSR_LMT_SHIFT; 36 37 value &= ~DMA_AXI_RD_OSR_LMT; 38 value |= (axi->axi_rd_osr_lmt & DMA_AXI_OSR_MAX) << 39 DMA_AXI_RD_OSR_LMT_SHIFT; 40 41 /* Depending on the UNDEF bit the Master AXI will perform any burst 42 * length according to the BLEN programmed (by default all BLEN are 43 * set). 44 */ 45 for (i = 0; i < AXI_BLEN; i++) { 46 switch (axi->axi_blen[i]) { 47 case 256: 48 value |= DMA_AXI_BLEN256; 49 break; 50 case 128: 51 value |= DMA_AXI_BLEN128; 52 break; 53 case 64: 54 value |= DMA_AXI_BLEN64; 55 break; 56 case 32: 57 value |= DMA_AXI_BLEN32; 58 break; 59 case 16: 60 value |= DMA_AXI_BLEN16; 61 break; 62 case 8: 63 value |= DMA_AXI_BLEN8; 64 break; 65 case 4: 66 value |= DMA_AXI_BLEN4; 67 break; 68 } 69 } 70 71 writel(value, ioaddr + DMA_SYS_BUS_MODE); 72 } 73 74 static void dwmac4_dma_init_rx_chan(void __iomem *ioaddr, 75 struct stmmac_dma_cfg *dma_cfg, 76 u32 dma_rx_phy, u32 chan) 77 { 78 u32 value; 79 u32 rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl; 80 81 value = readl(ioaddr + DMA_CHAN_RX_CONTROL(chan)); 82 value = value | (rxpbl << DMA_BUS_MODE_RPBL_SHIFT); 83 writel(value, ioaddr + DMA_CHAN_RX_CONTROL(chan)); 84 85 writel(dma_rx_phy, ioaddr + DMA_CHAN_RX_BASE_ADDR(chan)); 86 } 87 88 static void dwmac4_dma_init_tx_chan(void __iomem *ioaddr, 89 struct stmmac_dma_cfg *dma_cfg, 90 u32 dma_tx_phy, u32 chan) 91 { 92 u32 value; 93 u32 txpbl = dma_cfg->txpbl ?: dma_cfg->pbl; 94 95 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan)); 96 value = value | (txpbl << DMA_BUS_MODE_PBL_SHIFT); 97 writel(value, ioaddr + DMA_CHAN_TX_CONTROL(chan)); 98 99 writel(dma_tx_phy, ioaddr + DMA_CHAN_TX_BASE_ADDR(chan)); 100 } 101 102 static void dwmac4_dma_init_channel(void __iomem *ioaddr, 103 struct stmmac_dma_cfg *dma_cfg, u32 chan) 104 { 105 u32 value; 106 107 /* common channel control register config */ 108 value = readl(ioaddr + DMA_CHAN_CONTROL(chan)); 109 if (dma_cfg->pblx8) 110 value = value | DMA_BUS_MODE_PBL; 111 writel(value, ioaddr + DMA_CHAN_CONTROL(chan)); 112 113 /* Mask interrupts by writing to CSR7 */ 114 writel(DMA_CHAN_INTR_DEFAULT_MASK, 115 ioaddr + DMA_CHAN_INTR_ENA(chan)); 116 } 117 118 static void dwmac4_dma_init(void __iomem *ioaddr, 119 struct stmmac_dma_cfg *dma_cfg, 120 u32 dma_tx, u32 dma_rx, int atds) 121 { 122 u32 value = readl(ioaddr + DMA_SYS_BUS_MODE); 123 124 /* Set the Fixed burst mode */ 125 if (dma_cfg->fixed_burst) 126 value |= DMA_SYS_BUS_FB; 127 128 /* Mixed Burst has no effect when fb is set */ 129 if (dma_cfg->mixed_burst) 130 value |= DMA_SYS_BUS_MB; 131 132 if (dma_cfg->aal) 133 value |= DMA_SYS_BUS_AAL; 134 135 writel(value, ioaddr + DMA_SYS_BUS_MODE); 136 } 137 138 static void _dwmac4_dump_dma_regs(void __iomem *ioaddr, u32 channel, 139 u32 *reg_space) 140 { 141 reg_space[DMA_CHAN_CONTROL(channel) / 4] = 142 readl(ioaddr + DMA_CHAN_CONTROL(channel)); 143 reg_space[DMA_CHAN_TX_CONTROL(channel) / 4] = 144 readl(ioaddr + DMA_CHAN_TX_CONTROL(channel)); 145 reg_space[DMA_CHAN_RX_CONTROL(channel) / 4] = 146 readl(ioaddr + DMA_CHAN_RX_CONTROL(channel)); 147 reg_space[DMA_CHAN_TX_BASE_ADDR(channel) / 4] = 148 readl(ioaddr + DMA_CHAN_TX_BASE_ADDR(channel)); 149 reg_space[DMA_CHAN_RX_BASE_ADDR(channel) / 4] = 150 readl(ioaddr + DMA_CHAN_RX_BASE_ADDR(channel)); 151 reg_space[DMA_CHAN_TX_END_ADDR(channel) / 4] = 152 readl(ioaddr + DMA_CHAN_TX_END_ADDR(channel)); 153 reg_space[DMA_CHAN_RX_END_ADDR(channel) / 4] = 154 readl(ioaddr + DMA_CHAN_RX_END_ADDR(channel)); 155 reg_space[DMA_CHAN_TX_RING_LEN(channel) / 4] = 156 readl(ioaddr + DMA_CHAN_TX_RING_LEN(channel)); 157 reg_space[DMA_CHAN_RX_RING_LEN(channel) / 4] = 158 readl(ioaddr + DMA_CHAN_RX_RING_LEN(channel)); 159 reg_space[DMA_CHAN_INTR_ENA(channel) / 4] = 160 readl(ioaddr + DMA_CHAN_INTR_ENA(channel)); 161 reg_space[DMA_CHAN_RX_WATCHDOG(channel) / 4] = 162 readl(ioaddr + DMA_CHAN_RX_WATCHDOG(channel)); 163 reg_space[DMA_CHAN_SLOT_CTRL_STATUS(channel) / 4] = 164 readl(ioaddr + DMA_CHAN_SLOT_CTRL_STATUS(channel)); 165 reg_space[DMA_CHAN_CUR_TX_DESC(channel) / 4] = 166 readl(ioaddr + DMA_CHAN_CUR_TX_DESC(channel)); 167 reg_space[DMA_CHAN_CUR_RX_DESC(channel) / 4] = 168 readl(ioaddr + DMA_CHAN_CUR_RX_DESC(channel)); 169 reg_space[DMA_CHAN_CUR_TX_BUF_ADDR(channel) / 4] = 170 readl(ioaddr + DMA_CHAN_CUR_TX_BUF_ADDR(channel)); 171 reg_space[DMA_CHAN_CUR_RX_BUF_ADDR(channel) / 4] = 172 readl(ioaddr + DMA_CHAN_CUR_RX_BUF_ADDR(channel)); 173 reg_space[DMA_CHAN_STATUS(channel) / 4] = 174 readl(ioaddr + DMA_CHAN_STATUS(channel)); 175 } 176 177 static void dwmac4_dump_dma_regs(void __iomem *ioaddr, u32 *reg_space) 178 { 179 int i; 180 181 for (i = 0; i < DMA_CHANNEL_NB_MAX; i++) 182 _dwmac4_dump_dma_regs(ioaddr, i, reg_space); 183 } 184 185 static void dwmac4_rx_watchdog(void __iomem *ioaddr, u32 riwt, u32 number_chan) 186 { 187 u32 chan; 188 189 for (chan = 0; chan < number_chan; chan++) 190 writel(riwt, ioaddr + DMA_CHAN_RX_WATCHDOG(chan)); 191 } 192 193 static void dwmac4_dma_rx_chan_op_mode(void __iomem *ioaddr, int mode, 194 u32 channel, int fifosz) 195 { 196 unsigned int rqs = fifosz / 256 - 1; 197 u32 mtl_rx_op, mtl_rx_int; 198 199 mtl_rx_op = readl(ioaddr + MTL_CHAN_RX_OP_MODE(channel)); 200 201 if (mode == SF_DMA_MODE) { 202 pr_debug("GMAC: enable RX store and forward mode\n"); 203 mtl_rx_op |= MTL_OP_MODE_RSF; 204 } else { 205 pr_debug("GMAC: disable RX SF mode (threshold %d)\n", mode); 206 mtl_rx_op &= ~MTL_OP_MODE_RSF; 207 mtl_rx_op &= MTL_OP_MODE_RTC_MASK; 208 if (mode <= 32) 209 mtl_rx_op |= MTL_OP_MODE_RTC_32; 210 else if (mode <= 64) 211 mtl_rx_op |= MTL_OP_MODE_RTC_64; 212 else if (mode <= 96) 213 mtl_rx_op |= MTL_OP_MODE_RTC_96; 214 else 215 mtl_rx_op |= MTL_OP_MODE_RTC_128; 216 } 217 218 mtl_rx_op &= ~MTL_OP_MODE_RQS_MASK; 219 mtl_rx_op |= rqs << MTL_OP_MODE_RQS_SHIFT; 220 221 /* enable flow control only if each channel gets 4 KiB or more FIFO */ 222 if (fifosz >= 4096) { 223 unsigned int rfd, rfa; 224 225 mtl_rx_op |= MTL_OP_MODE_EHFC; 226 227 /* Set Threshold for Activating Flow Control to min 2 frames, 228 * i.e. 1500 * 2 = 3000 bytes. 229 * 230 * Set Threshold for Deactivating Flow Control to min 1 frame, 231 * i.e. 1500 bytes. 232 */ 233 switch (fifosz) { 234 case 4096: 235 /* This violates the above formula because of FIFO size 236 * limit therefore overflow may occur in spite of this. 237 */ 238 rfd = 0x03; /* Full-2.5K */ 239 rfa = 0x01; /* Full-1.5K */ 240 break; 241 242 case 8192: 243 rfd = 0x06; /* Full-4K */ 244 rfa = 0x0a; /* Full-6K */ 245 break; 246 247 case 16384: 248 rfd = 0x06; /* Full-4K */ 249 rfa = 0x12; /* Full-10K */ 250 break; 251 252 default: 253 rfd = 0x06; /* Full-4K */ 254 rfa = 0x1e; /* Full-16K */ 255 break; 256 } 257 258 mtl_rx_op &= ~MTL_OP_MODE_RFD_MASK; 259 mtl_rx_op |= rfd << MTL_OP_MODE_RFD_SHIFT; 260 261 mtl_rx_op &= ~MTL_OP_MODE_RFA_MASK; 262 mtl_rx_op |= rfa << MTL_OP_MODE_RFA_SHIFT; 263 } 264 265 writel(mtl_rx_op, ioaddr + MTL_CHAN_RX_OP_MODE(channel)); 266 267 /* Enable MTL RX overflow */ 268 mtl_rx_int = readl(ioaddr + MTL_CHAN_INT_CTRL(channel)); 269 writel(mtl_rx_int | MTL_RX_OVERFLOW_INT_EN, 270 ioaddr + MTL_CHAN_INT_CTRL(channel)); 271 } 272 273 static void dwmac4_dma_tx_chan_op_mode(void __iomem *ioaddr, int mode, 274 u32 channel) 275 { 276 u32 mtl_tx_op = readl(ioaddr + MTL_CHAN_TX_OP_MODE(channel)); 277 278 if (mode == SF_DMA_MODE) { 279 pr_debug("GMAC: enable TX store and forward mode\n"); 280 /* Transmit COE type 2 cannot be done in cut-through mode. */ 281 mtl_tx_op |= MTL_OP_MODE_TSF; 282 } else { 283 pr_debug("GMAC: disabling TX SF (threshold %d)\n", mode); 284 mtl_tx_op &= ~MTL_OP_MODE_TSF; 285 mtl_tx_op &= MTL_OP_MODE_TTC_MASK; 286 /* Set the transmit threshold */ 287 if (mode <= 32) 288 mtl_tx_op |= MTL_OP_MODE_TTC_32; 289 else if (mode <= 64) 290 mtl_tx_op |= MTL_OP_MODE_TTC_64; 291 else if (mode <= 96) 292 mtl_tx_op |= MTL_OP_MODE_TTC_96; 293 else if (mode <= 128) 294 mtl_tx_op |= MTL_OP_MODE_TTC_128; 295 else if (mode <= 192) 296 mtl_tx_op |= MTL_OP_MODE_TTC_192; 297 else if (mode <= 256) 298 mtl_tx_op |= MTL_OP_MODE_TTC_256; 299 else if (mode <= 384) 300 mtl_tx_op |= MTL_OP_MODE_TTC_384; 301 else 302 mtl_tx_op |= MTL_OP_MODE_TTC_512; 303 } 304 /* For an IP with DWC_EQOS_NUM_TXQ == 1, the fields TXQEN and TQS are RO 305 * with reset values: TXQEN on, TQS == DWC_EQOS_TXFIFO_SIZE. 306 * For an IP with DWC_EQOS_NUM_TXQ > 1, the fields TXQEN and TQS are R/W 307 * with reset values: TXQEN off, TQS 256 bytes. 308 * 309 * Write the bits in both cases, since it will have no effect when RO. 310 * For DWC_EQOS_NUM_TXQ > 1, the top bits in MTL_OP_MODE_TQS_MASK might 311 * be RO, however, writing the whole TQS field will result in a value 312 * equal to DWC_EQOS_TXFIFO_SIZE, just like for DWC_EQOS_NUM_TXQ == 1. 313 */ 314 mtl_tx_op |= MTL_OP_MODE_TXQEN | MTL_OP_MODE_TQS_MASK; 315 writel(mtl_tx_op, ioaddr + MTL_CHAN_TX_OP_MODE(channel)); 316 } 317 318 static void dwmac4_get_hw_feature(void __iomem *ioaddr, 319 struct dma_features *dma_cap) 320 { 321 u32 hw_cap = readl(ioaddr + GMAC_HW_FEATURE0); 322 323 /* MAC HW feature0 */ 324 dma_cap->mbps_10_100 = (hw_cap & GMAC_HW_FEAT_MIISEL); 325 dma_cap->mbps_1000 = (hw_cap & GMAC_HW_FEAT_GMIISEL) >> 1; 326 dma_cap->half_duplex = (hw_cap & GMAC_HW_FEAT_HDSEL) >> 2; 327 dma_cap->hash_filter = (hw_cap & GMAC_HW_FEAT_VLHASH) >> 4; 328 dma_cap->multi_addr = (hw_cap & GMAC_HW_FEAT_ADDMAC) >> 18; 329 dma_cap->pcs = (hw_cap & GMAC_HW_FEAT_PCSSEL) >> 3; 330 dma_cap->sma_mdio = (hw_cap & GMAC_HW_FEAT_SMASEL) >> 5; 331 dma_cap->pmt_remote_wake_up = (hw_cap & GMAC_HW_FEAT_RWKSEL) >> 6; 332 dma_cap->pmt_magic_frame = (hw_cap & GMAC_HW_FEAT_MGKSEL) >> 7; 333 /* MMC */ 334 dma_cap->rmon = (hw_cap & GMAC_HW_FEAT_MMCSEL) >> 8; 335 /* IEEE 1588-2008 */ 336 dma_cap->atime_stamp = (hw_cap & GMAC_HW_FEAT_TSSEL) >> 12; 337 /* 802.3az - Energy-Efficient Ethernet (EEE) */ 338 dma_cap->eee = (hw_cap & GMAC_HW_FEAT_EEESEL) >> 13; 339 /* TX and RX csum */ 340 dma_cap->tx_coe = (hw_cap & GMAC_HW_FEAT_TXCOSEL) >> 14; 341 dma_cap->rx_coe = (hw_cap & GMAC_HW_FEAT_RXCOESEL) >> 16; 342 343 /* MAC HW feature1 */ 344 hw_cap = readl(ioaddr + GMAC_HW_FEATURE1); 345 dma_cap->av = (hw_cap & GMAC_HW_FEAT_AVSEL) >> 20; 346 dma_cap->tsoen = (hw_cap & GMAC_HW_TSOEN) >> 18; 347 /* RX and TX FIFO sizes are encoded as log2(n / 128). Undo that by 348 * shifting and store the sizes in bytes. 349 */ 350 dma_cap->tx_fifo_size = 128 << ((hw_cap & GMAC_HW_TXFIFOSIZE) >> 6); 351 dma_cap->rx_fifo_size = 128 << ((hw_cap & GMAC_HW_RXFIFOSIZE) >> 0); 352 /* MAC HW feature2 */ 353 hw_cap = readl(ioaddr + GMAC_HW_FEATURE2); 354 /* TX and RX number of channels */ 355 dma_cap->number_rx_channel = 356 ((hw_cap & GMAC_HW_FEAT_RXCHCNT) >> 12) + 1; 357 dma_cap->number_tx_channel = 358 ((hw_cap & GMAC_HW_FEAT_TXCHCNT) >> 18) + 1; 359 /* TX and RX number of queues */ 360 dma_cap->number_rx_queues = 361 ((hw_cap & GMAC_HW_FEAT_RXQCNT) >> 0) + 1; 362 dma_cap->number_tx_queues = 363 ((hw_cap & GMAC_HW_FEAT_TXQCNT) >> 6) + 1; 364 365 /* IEEE 1588-2002 */ 366 dma_cap->time_stamp = 0; 367 } 368 369 /* Enable/disable TSO feature and set MSS */ 370 static void dwmac4_enable_tso(void __iomem *ioaddr, bool en, u32 chan) 371 { 372 u32 value; 373 374 if (en) { 375 /* enable TSO */ 376 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan)); 377 writel(value | DMA_CONTROL_TSE, 378 ioaddr + DMA_CHAN_TX_CONTROL(chan)); 379 } else { 380 /* enable TSO */ 381 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan)); 382 writel(value & ~DMA_CONTROL_TSE, 383 ioaddr + DMA_CHAN_TX_CONTROL(chan)); 384 } 385 } 386 387 const struct stmmac_dma_ops dwmac4_dma_ops = { 388 .reset = dwmac4_dma_reset, 389 .init = dwmac4_dma_init, 390 .init_chan = dwmac4_dma_init_channel, 391 .init_rx_chan = dwmac4_dma_init_rx_chan, 392 .init_tx_chan = dwmac4_dma_init_tx_chan, 393 .axi = dwmac4_dma_axi, 394 .dump_regs = dwmac4_dump_dma_regs, 395 .dma_rx_mode = dwmac4_dma_rx_chan_op_mode, 396 .dma_tx_mode = dwmac4_dma_tx_chan_op_mode, 397 .enable_dma_irq = dwmac4_enable_dma_irq, 398 .disable_dma_irq = dwmac4_disable_dma_irq, 399 .start_tx = dwmac4_dma_start_tx, 400 .stop_tx = dwmac4_dma_stop_tx, 401 .start_rx = dwmac4_dma_start_rx, 402 .stop_rx = dwmac4_dma_stop_rx, 403 .dma_interrupt = dwmac4_dma_interrupt, 404 .get_hw_feature = dwmac4_get_hw_feature, 405 .rx_watchdog = dwmac4_rx_watchdog, 406 .set_rx_ring_len = dwmac4_set_rx_ring_len, 407 .set_tx_ring_len = dwmac4_set_tx_ring_len, 408 .set_rx_tail_ptr = dwmac4_set_rx_tail_ptr, 409 .set_tx_tail_ptr = dwmac4_set_tx_tail_ptr, 410 .enable_tso = dwmac4_enable_tso, 411 }; 412 413 const struct stmmac_dma_ops dwmac410_dma_ops = { 414 .reset = dwmac4_dma_reset, 415 .init = dwmac4_dma_init, 416 .init_chan = dwmac4_dma_init_channel, 417 .init_rx_chan = dwmac4_dma_init_rx_chan, 418 .init_tx_chan = dwmac4_dma_init_tx_chan, 419 .axi = dwmac4_dma_axi, 420 .dump_regs = dwmac4_dump_dma_regs, 421 .dma_rx_mode = dwmac4_dma_rx_chan_op_mode, 422 .dma_tx_mode = dwmac4_dma_tx_chan_op_mode, 423 .enable_dma_irq = dwmac410_enable_dma_irq, 424 .disable_dma_irq = dwmac4_disable_dma_irq, 425 .start_tx = dwmac4_dma_start_tx, 426 .stop_tx = dwmac4_dma_stop_tx, 427 .start_rx = dwmac4_dma_start_rx, 428 .stop_rx = dwmac4_dma_stop_rx, 429 .dma_interrupt = dwmac4_dma_interrupt, 430 .get_hw_feature = dwmac4_get_hw_feature, 431 .rx_watchdog = dwmac4_rx_watchdog, 432 .set_rx_ring_len = dwmac4_set_rx_ring_len, 433 .set_tx_ring_len = dwmac4_set_tx_ring_len, 434 .set_rx_tail_ptr = dwmac4_set_rx_tail_ptr, 435 .set_tx_tail_ptr = dwmac4_set_tx_tail_ptr, 436 .enable_tso = dwmac4_enable_tso, 437 }; 438