1 // SPDX-License-Identifier: GPL-2.0-only
3 * This is the driver for the GMAC on-chip Ethernet controller for ST SoCs.
4 * DWC Ether MAC version 4.xx has been used for developing this code.
6 * This contains the functions to handle the dma.
8 * Copyright (C) 2015 STMicroelectronics Ltd
10 * Author: Alexandre Torgue <alexandre.torgue@st.com>
15 #include "dwmac4_dma.h"
17 static void dwmac4_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi)
19 u32 value = readl(ioaddr + DMA_SYS_BUS_MODE);
22 pr_info("dwmac4: Master AXI performs %s burst length\n",
23 (value & DMA_SYS_BUS_FB) ? "fixed" : "any");
26 value |= DMA_AXI_EN_LPI;
28 value |= DMA_AXI_LPI_XIT_FRM;
30 value &= ~DMA_AXI_WR_OSR_LMT;
31 value |= (axi->axi_wr_osr_lmt & DMA_AXI_OSR_MAX) <<
32 DMA_AXI_WR_OSR_LMT_SHIFT;
34 value &= ~DMA_AXI_RD_OSR_LMT;
35 value |= (axi->axi_rd_osr_lmt & DMA_AXI_OSR_MAX) <<
36 DMA_AXI_RD_OSR_LMT_SHIFT;
38 /* Depending on the UNDEF bit the Master AXI will perform any burst
39 * length according to the BLEN programmed (by default all BLEN are
42 for (i = 0; i < AXI_BLEN; i++) {
43 switch (axi->axi_blen[i]) {
45 value |= DMA_AXI_BLEN256;
48 value |= DMA_AXI_BLEN128;
51 value |= DMA_AXI_BLEN64;
54 value |= DMA_AXI_BLEN32;
57 value |= DMA_AXI_BLEN16;
60 value |= DMA_AXI_BLEN8;
63 value |= DMA_AXI_BLEN4;
68 writel(value, ioaddr + DMA_SYS_BUS_MODE);
71 static void dwmac4_dma_init_rx_chan(void __iomem *ioaddr,
72 struct stmmac_dma_cfg *dma_cfg,
73 dma_addr_t dma_rx_phy, u32 chan)
76 u32 rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl;
78 value = readl(ioaddr + DMA_CHAN_RX_CONTROL(chan));
79 value = value | (rxpbl << DMA_BUS_MODE_RPBL_SHIFT);
80 writel(value, ioaddr + DMA_CHAN_RX_CONTROL(chan));
82 if (IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) && likely(dma_cfg->eame))
83 writel(upper_32_bits(dma_rx_phy),
84 ioaddr + DMA_CHAN_RX_BASE_ADDR_HI(chan));
86 writel(lower_32_bits(dma_rx_phy), ioaddr + DMA_CHAN_RX_BASE_ADDR(chan));
89 static void dwmac4_dma_init_tx_chan(void __iomem *ioaddr,
90 struct stmmac_dma_cfg *dma_cfg,
91 dma_addr_t dma_tx_phy, u32 chan)
94 u32 txpbl = dma_cfg->txpbl ?: dma_cfg->pbl;
96 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
97 value = value | (txpbl << DMA_BUS_MODE_PBL_SHIFT);
99 /* Enable OSP to get best performance */
100 value |= DMA_CONTROL_OSP;
102 writel(value, ioaddr + DMA_CHAN_TX_CONTROL(chan));
104 if (IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) && likely(dma_cfg->eame))
105 writel(upper_32_bits(dma_tx_phy),
106 ioaddr + DMA_CHAN_TX_BASE_ADDR_HI(chan));
108 writel(lower_32_bits(dma_tx_phy), ioaddr + DMA_CHAN_TX_BASE_ADDR(chan));
111 static void dwmac4_dma_init_channel(void __iomem *ioaddr,
112 struct stmmac_dma_cfg *dma_cfg, u32 chan)
116 /* common channel control register config */
117 value = readl(ioaddr + DMA_CHAN_CONTROL(chan));
119 value = value | DMA_BUS_MODE_PBL;
120 writel(value, ioaddr + DMA_CHAN_CONTROL(chan));
122 /* Mask interrupts by writing to CSR7 */
123 writel(DMA_CHAN_INTR_DEFAULT_MASK,
124 ioaddr + DMA_CHAN_INTR_ENA(chan));
127 static void dwmac4_dma_init(void __iomem *ioaddr,
128 struct stmmac_dma_cfg *dma_cfg, int atds)
130 u32 value = readl(ioaddr + DMA_SYS_BUS_MODE);
132 /* Set the Fixed burst mode */
133 if (dma_cfg->fixed_burst)
134 value |= DMA_SYS_BUS_FB;
136 /* Mixed Burst has no effect when fb is set */
137 if (dma_cfg->mixed_burst)
138 value |= DMA_SYS_BUS_MB;
141 value |= DMA_SYS_BUS_AAL;
144 value |= DMA_SYS_BUS_EAME;
146 writel(value, ioaddr + DMA_SYS_BUS_MODE);
149 static void _dwmac4_dump_dma_regs(void __iomem *ioaddr, u32 channel,
152 reg_space[DMA_CHAN_CONTROL(channel) / 4] =
153 readl(ioaddr + DMA_CHAN_CONTROL(channel));
154 reg_space[DMA_CHAN_TX_CONTROL(channel) / 4] =
155 readl(ioaddr + DMA_CHAN_TX_CONTROL(channel));
156 reg_space[DMA_CHAN_RX_CONTROL(channel) / 4] =
157 readl(ioaddr + DMA_CHAN_RX_CONTROL(channel));
158 reg_space[DMA_CHAN_TX_BASE_ADDR(channel) / 4] =
159 readl(ioaddr + DMA_CHAN_TX_BASE_ADDR(channel));
160 reg_space[DMA_CHAN_RX_BASE_ADDR(channel) / 4] =
161 readl(ioaddr + DMA_CHAN_RX_BASE_ADDR(channel));
162 reg_space[DMA_CHAN_TX_END_ADDR(channel) / 4] =
163 readl(ioaddr + DMA_CHAN_TX_END_ADDR(channel));
164 reg_space[DMA_CHAN_RX_END_ADDR(channel) / 4] =
165 readl(ioaddr + DMA_CHAN_RX_END_ADDR(channel));
166 reg_space[DMA_CHAN_TX_RING_LEN(channel) / 4] =
167 readl(ioaddr + DMA_CHAN_TX_RING_LEN(channel));
168 reg_space[DMA_CHAN_RX_RING_LEN(channel) / 4] =
169 readl(ioaddr + DMA_CHAN_RX_RING_LEN(channel));
170 reg_space[DMA_CHAN_INTR_ENA(channel) / 4] =
171 readl(ioaddr + DMA_CHAN_INTR_ENA(channel));
172 reg_space[DMA_CHAN_RX_WATCHDOG(channel) / 4] =
173 readl(ioaddr + DMA_CHAN_RX_WATCHDOG(channel));
174 reg_space[DMA_CHAN_SLOT_CTRL_STATUS(channel) / 4] =
175 readl(ioaddr + DMA_CHAN_SLOT_CTRL_STATUS(channel));
176 reg_space[DMA_CHAN_CUR_TX_DESC(channel) / 4] =
177 readl(ioaddr + DMA_CHAN_CUR_TX_DESC(channel));
178 reg_space[DMA_CHAN_CUR_RX_DESC(channel) / 4] =
179 readl(ioaddr + DMA_CHAN_CUR_RX_DESC(channel));
180 reg_space[DMA_CHAN_CUR_TX_BUF_ADDR(channel) / 4] =
181 readl(ioaddr + DMA_CHAN_CUR_TX_BUF_ADDR(channel));
182 reg_space[DMA_CHAN_CUR_RX_BUF_ADDR(channel) / 4] =
183 readl(ioaddr + DMA_CHAN_CUR_RX_BUF_ADDR(channel));
184 reg_space[DMA_CHAN_STATUS(channel) / 4] =
185 readl(ioaddr + DMA_CHAN_STATUS(channel));
188 static void dwmac4_dump_dma_regs(void __iomem *ioaddr, u32 *reg_space)
192 for (i = 0; i < DMA_CHANNEL_NB_MAX; i++)
193 _dwmac4_dump_dma_regs(ioaddr, i, reg_space);
196 static void dwmac4_rx_watchdog(void __iomem *ioaddr, u32 riwt, u32 number_chan)
200 for (chan = 0; chan < number_chan; chan++)
201 writel(riwt, ioaddr + DMA_CHAN_RX_WATCHDOG(chan));
204 static void dwmac4_dma_rx_chan_op_mode(void __iomem *ioaddr, int mode,
205 u32 channel, int fifosz, u8 qmode)
207 unsigned int rqs = fifosz / 256 - 1;
208 u32 mtl_rx_op, mtl_rx_int;
210 mtl_rx_op = readl(ioaddr + MTL_CHAN_RX_OP_MODE(channel));
212 if (mode == SF_DMA_MODE) {
213 pr_debug("GMAC: enable RX store and forward mode\n");
214 mtl_rx_op |= MTL_OP_MODE_RSF;
216 pr_debug("GMAC: disable RX SF mode (threshold %d)\n", mode);
217 mtl_rx_op &= ~MTL_OP_MODE_RSF;
218 mtl_rx_op &= MTL_OP_MODE_RTC_MASK;
220 mtl_rx_op |= MTL_OP_MODE_RTC_32;
222 mtl_rx_op |= MTL_OP_MODE_RTC_64;
224 mtl_rx_op |= MTL_OP_MODE_RTC_96;
226 mtl_rx_op |= MTL_OP_MODE_RTC_128;
229 mtl_rx_op &= ~MTL_OP_MODE_RQS_MASK;
230 mtl_rx_op |= rqs << MTL_OP_MODE_RQS_SHIFT;
232 /* Enable flow control only if each channel gets 4 KiB or more FIFO and
233 * only if channel is not an AVB channel.
235 if ((fifosz >= 4096) && (qmode != MTL_QUEUE_AVB)) {
236 unsigned int rfd, rfa;
238 mtl_rx_op |= MTL_OP_MODE_EHFC;
240 /* Set Threshold for Activating Flow Control to min 2 frames,
241 * i.e. 1500 * 2 = 3000 bytes.
243 * Set Threshold for Deactivating Flow Control to min 1 frame,
248 /* This violates the above formula because of FIFO size
249 * limit therefore overflow may occur in spite of this.
251 rfd = 0x03; /* Full-2.5K */
252 rfa = 0x01; /* Full-1.5K */
256 rfd = 0x06; /* Full-4K */
257 rfa = 0x0a; /* Full-6K */
261 rfd = 0x06; /* Full-4K */
262 rfa = 0x12; /* Full-10K */
266 rfd = 0x06; /* Full-4K */
267 rfa = 0x1e; /* Full-16K */
271 mtl_rx_op &= ~MTL_OP_MODE_RFD_MASK;
272 mtl_rx_op |= rfd << MTL_OP_MODE_RFD_SHIFT;
274 mtl_rx_op &= ~MTL_OP_MODE_RFA_MASK;
275 mtl_rx_op |= rfa << MTL_OP_MODE_RFA_SHIFT;
278 writel(mtl_rx_op, ioaddr + MTL_CHAN_RX_OP_MODE(channel));
280 /* Enable MTL RX overflow */
281 mtl_rx_int = readl(ioaddr + MTL_CHAN_INT_CTRL(channel));
282 writel(mtl_rx_int | MTL_RX_OVERFLOW_INT_EN,
283 ioaddr + MTL_CHAN_INT_CTRL(channel));
286 static void dwmac4_dma_tx_chan_op_mode(void __iomem *ioaddr, int mode,
287 u32 channel, int fifosz, u8 qmode)
289 u32 mtl_tx_op = readl(ioaddr + MTL_CHAN_TX_OP_MODE(channel));
290 unsigned int tqs = fifosz / 256 - 1;
292 if (mode == SF_DMA_MODE) {
293 pr_debug("GMAC: enable TX store and forward mode\n");
294 /* Transmit COE type 2 cannot be done in cut-through mode. */
295 mtl_tx_op |= MTL_OP_MODE_TSF;
297 pr_debug("GMAC: disabling TX SF (threshold %d)\n", mode);
298 mtl_tx_op &= ~MTL_OP_MODE_TSF;
299 mtl_tx_op &= MTL_OP_MODE_TTC_MASK;
300 /* Set the transmit threshold */
302 mtl_tx_op |= MTL_OP_MODE_TTC_32;
304 mtl_tx_op |= MTL_OP_MODE_TTC_64;
306 mtl_tx_op |= MTL_OP_MODE_TTC_96;
307 else if (mode <= 128)
308 mtl_tx_op |= MTL_OP_MODE_TTC_128;
309 else if (mode <= 192)
310 mtl_tx_op |= MTL_OP_MODE_TTC_192;
311 else if (mode <= 256)
312 mtl_tx_op |= MTL_OP_MODE_TTC_256;
313 else if (mode <= 384)
314 mtl_tx_op |= MTL_OP_MODE_TTC_384;
316 mtl_tx_op |= MTL_OP_MODE_TTC_512;
318 /* For an IP with DWC_EQOS_NUM_TXQ == 1, the fields TXQEN and TQS are RO
319 * with reset values: TXQEN on, TQS == DWC_EQOS_TXFIFO_SIZE.
320 * For an IP with DWC_EQOS_NUM_TXQ > 1, the fields TXQEN and TQS are R/W
321 * with reset values: TXQEN off, TQS 256 bytes.
323 * TXQEN must be written for multi-channel operation and TQS must
324 * reflect the available fifo size per queue (total fifo size / number
325 * of enabled queues).
327 mtl_tx_op &= ~MTL_OP_MODE_TXQEN_MASK;
328 if (qmode != MTL_QUEUE_AVB)
329 mtl_tx_op |= MTL_OP_MODE_TXQEN;
331 mtl_tx_op |= MTL_OP_MODE_TXQEN_AV;
332 mtl_tx_op &= ~MTL_OP_MODE_TQS_MASK;
333 mtl_tx_op |= tqs << MTL_OP_MODE_TQS_SHIFT;
335 writel(mtl_tx_op, ioaddr + MTL_CHAN_TX_OP_MODE(channel));
338 static void dwmac4_get_hw_feature(void __iomem *ioaddr,
339 struct dma_features *dma_cap)
341 u32 hw_cap = readl(ioaddr + GMAC_HW_FEATURE0);
343 /* MAC HW feature0 */
344 dma_cap->mbps_10_100 = (hw_cap & GMAC_HW_FEAT_MIISEL);
345 dma_cap->mbps_1000 = (hw_cap & GMAC_HW_FEAT_GMIISEL) >> 1;
346 dma_cap->half_duplex = (hw_cap & GMAC_HW_FEAT_HDSEL) >> 2;
347 dma_cap->vlhash = (hw_cap & GMAC_HW_FEAT_VLHASH) >> 4;
348 dma_cap->multi_addr = (hw_cap & GMAC_HW_FEAT_ADDMAC) >> 18;
349 dma_cap->pcs = (hw_cap & GMAC_HW_FEAT_PCSSEL) >> 3;
350 dma_cap->sma_mdio = (hw_cap & GMAC_HW_FEAT_SMASEL) >> 5;
351 dma_cap->pmt_remote_wake_up = (hw_cap & GMAC_HW_FEAT_RWKSEL) >> 6;
352 dma_cap->pmt_magic_frame = (hw_cap & GMAC_HW_FEAT_MGKSEL) >> 7;
354 dma_cap->rmon = (hw_cap & GMAC_HW_FEAT_MMCSEL) >> 8;
356 dma_cap->atime_stamp = (hw_cap & GMAC_HW_FEAT_TSSEL) >> 12;
357 /* 802.3az - Energy-Efficient Ethernet (EEE) */
358 dma_cap->eee = (hw_cap & GMAC_HW_FEAT_EEESEL) >> 13;
360 dma_cap->tx_coe = (hw_cap & GMAC_HW_FEAT_TXCOSEL) >> 14;
361 dma_cap->rx_coe = (hw_cap & GMAC_HW_FEAT_RXCOESEL) >> 16;
362 dma_cap->vlins = (hw_cap & GMAC_HW_FEAT_SAVLANINS) >> 27;
363 dma_cap->arpoffsel = (hw_cap & GMAC_HW_FEAT_ARPOFFSEL) >> 9;
365 /* MAC HW feature1 */
366 hw_cap = readl(ioaddr + GMAC_HW_FEATURE1);
367 dma_cap->hash_tb_sz = (hw_cap & GMAC_HW_HASH_TB_SZ) >> 24;
368 dma_cap->av = (hw_cap & GMAC_HW_FEAT_AVSEL) >> 20;
369 dma_cap->tsoen = (hw_cap & GMAC_HW_TSOEN) >> 18;
371 dma_cap->addr64 = (hw_cap & GMAC_HW_ADDR64) >> 14;
372 switch (dma_cap->addr64) {
374 dma_cap->addr64 = 32;
377 dma_cap->addr64 = 40;
380 dma_cap->addr64 = 48;
383 dma_cap->addr64 = 32;
387 /* RX and TX FIFO sizes are encoded as log2(n / 128). Undo that by
388 * shifting and store the sizes in bytes.
390 dma_cap->tx_fifo_size = 128 << ((hw_cap & GMAC_HW_TXFIFOSIZE) >> 6);
391 dma_cap->rx_fifo_size = 128 << ((hw_cap & GMAC_HW_RXFIFOSIZE) >> 0);
392 /* MAC HW feature2 */
393 hw_cap = readl(ioaddr + GMAC_HW_FEATURE2);
394 /* TX and RX number of channels */
395 dma_cap->number_rx_channel =
396 ((hw_cap & GMAC_HW_FEAT_RXCHCNT) >> 12) + 1;
397 dma_cap->number_tx_channel =
398 ((hw_cap & GMAC_HW_FEAT_TXCHCNT) >> 18) + 1;
399 /* TX and RX number of queues */
400 dma_cap->number_rx_queues =
401 ((hw_cap & GMAC_HW_FEAT_RXQCNT) >> 0) + 1;
402 dma_cap->number_tx_queues =
403 ((hw_cap & GMAC_HW_FEAT_TXQCNT) >> 6) + 1;
405 dma_cap->pps_out_num = (hw_cap & GMAC_HW_FEAT_PPSOUTNUM) >> 24;
408 dma_cap->time_stamp = 0;
410 /* MAC HW feature3 */
411 hw_cap = readl(ioaddr + GMAC_HW_FEATURE3);
414 dma_cap->asp = (hw_cap & GMAC_HW_FEAT_ASP) >> 28;
415 dma_cap->frpes = (hw_cap & GMAC_HW_FEAT_FRPES) >> 13;
416 dma_cap->frpbs = (hw_cap & GMAC_HW_FEAT_FRPBS) >> 11;
417 dma_cap->frpsel = (hw_cap & GMAC_HW_FEAT_FRPSEL) >> 10;
418 dma_cap->dvlan = (hw_cap & GMAC_HW_FEAT_DVLAN) >> 5;
421 /* Enable/disable TSO feature and set MSS */
422 static void dwmac4_enable_tso(void __iomem *ioaddr, bool en, u32 chan)
428 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
429 writel(value | DMA_CONTROL_TSE,
430 ioaddr + DMA_CHAN_TX_CONTROL(chan));
433 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
434 writel(value & ~DMA_CONTROL_TSE,
435 ioaddr + DMA_CHAN_TX_CONTROL(chan));
439 static void dwmac4_qmode(void __iomem *ioaddr, u32 channel, u8 qmode)
441 u32 mtl_tx_op = readl(ioaddr + MTL_CHAN_TX_OP_MODE(channel));
443 mtl_tx_op &= ~MTL_OP_MODE_TXQEN_MASK;
444 if (qmode != MTL_QUEUE_AVB)
445 mtl_tx_op |= MTL_OP_MODE_TXQEN;
447 mtl_tx_op |= MTL_OP_MODE_TXQEN_AV;
449 writel(mtl_tx_op, ioaddr + MTL_CHAN_TX_OP_MODE(channel));
452 static void dwmac4_set_bfsize(void __iomem *ioaddr, int bfsize, u32 chan)
454 u32 value = readl(ioaddr + DMA_CHAN_RX_CONTROL(chan));
456 value &= ~DMA_RBSZ_MASK;
457 value |= (bfsize << DMA_RBSZ_SHIFT) & DMA_RBSZ_MASK;
459 writel(value, ioaddr + DMA_CHAN_RX_CONTROL(chan));
462 const struct stmmac_dma_ops dwmac4_dma_ops = {
463 .reset = dwmac4_dma_reset,
464 .init = dwmac4_dma_init,
465 .init_chan = dwmac4_dma_init_channel,
466 .init_rx_chan = dwmac4_dma_init_rx_chan,
467 .init_tx_chan = dwmac4_dma_init_tx_chan,
468 .axi = dwmac4_dma_axi,
469 .dump_regs = dwmac4_dump_dma_regs,
470 .dma_rx_mode = dwmac4_dma_rx_chan_op_mode,
471 .dma_tx_mode = dwmac4_dma_tx_chan_op_mode,
472 .enable_dma_irq = dwmac4_enable_dma_irq,
473 .disable_dma_irq = dwmac4_disable_dma_irq,
474 .start_tx = dwmac4_dma_start_tx,
475 .stop_tx = dwmac4_dma_stop_tx,
476 .start_rx = dwmac4_dma_start_rx,
477 .stop_rx = dwmac4_dma_stop_rx,
478 .dma_interrupt = dwmac4_dma_interrupt,
479 .get_hw_feature = dwmac4_get_hw_feature,
480 .rx_watchdog = dwmac4_rx_watchdog,
481 .set_rx_ring_len = dwmac4_set_rx_ring_len,
482 .set_tx_ring_len = dwmac4_set_tx_ring_len,
483 .set_rx_tail_ptr = dwmac4_set_rx_tail_ptr,
484 .set_tx_tail_ptr = dwmac4_set_tx_tail_ptr,
485 .enable_tso = dwmac4_enable_tso,
486 .qmode = dwmac4_qmode,
487 .set_bfsize = dwmac4_set_bfsize,
490 const struct stmmac_dma_ops dwmac410_dma_ops = {
491 .reset = dwmac4_dma_reset,
492 .init = dwmac4_dma_init,
493 .init_chan = dwmac4_dma_init_channel,
494 .init_rx_chan = dwmac4_dma_init_rx_chan,
495 .init_tx_chan = dwmac4_dma_init_tx_chan,
496 .axi = dwmac4_dma_axi,
497 .dump_regs = dwmac4_dump_dma_regs,
498 .dma_rx_mode = dwmac4_dma_rx_chan_op_mode,
499 .dma_tx_mode = dwmac4_dma_tx_chan_op_mode,
500 .enable_dma_irq = dwmac410_enable_dma_irq,
501 .disable_dma_irq = dwmac4_disable_dma_irq,
502 .start_tx = dwmac4_dma_start_tx,
503 .stop_tx = dwmac4_dma_stop_tx,
504 .start_rx = dwmac4_dma_start_rx,
505 .stop_rx = dwmac4_dma_stop_rx,
506 .dma_interrupt = dwmac4_dma_interrupt,
507 .get_hw_feature = dwmac4_get_hw_feature,
508 .rx_watchdog = dwmac4_rx_watchdog,
509 .set_rx_ring_len = dwmac4_set_rx_ring_len,
510 .set_tx_ring_len = dwmac4_set_tx_ring_len,
511 .set_rx_tail_ptr = dwmac4_set_rx_tail_ptr,
512 .set_tx_tail_ptr = dwmac4_set_tx_tail_ptr,
513 .enable_tso = dwmac4_enable_tso,
514 .qmode = dwmac4_qmode,
515 .set_bfsize = dwmac4_set_bfsize,