1 // SPDX-License-Identifier: GPL-2.0-only
2 /*******************************************************************************
3 This is the driver for the GMAC on-chip Ethernet controller for ST SoCs.
4 DWC Ether MAC 10/100/1000 Universal version 3.41a has been used for
5 developing this code.
6
7 This contains the functions to handle the dma.
8
9 Copyright (C) 2007-2009 STMicroelectronics Ltd
10
11
12 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
13 *******************************************************************************/
14
15 #include <asm/io.h>
16 #include "dwmac1000.h"
17 #include "dwmac_dma.h"
18
dwmac1000_dma_axi(void __iomem * ioaddr,struct stmmac_axi * axi)19 static void dwmac1000_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi)
20 {
21 u32 value = readl(ioaddr + DMA_AXI_BUS_MODE);
22 int i;
23
24 pr_info("dwmac1000: Master AXI performs %s burst length\n",
25 !(value & DMA_AXI_UNDEF) ? "fixed" : "any");
26
27 if (axi->axi_lpi_en)
28 value |= DMA_AXI_EN_LPI;
29 if (axi->axi_xit_frm)
30 value |= DMA_AXI_LPI_XIT_FRM;
31
32 value &= ~DMA_AXI_WR_OSR_LMT;
33 value |= (axi->axi_wr_osr_lmt & DMA_AXI_WR_OSR_LMT_MASK) <<
34 DMA_AXI_WR_OSR_LMT_SHIFT;
35
36 value &= ~DMA_AXI_RD_OSR_LMT;
37 value |= (axi->axi_rd_osr_lmt & DMA_AXI_RD_OSR_LMT_MASK) <<
38 DMA_AXI_RD_OSR_LMT_SHIFT;
39
40 /* Depending on the UNDEF bit the Master AXI will perform any burst
41 * length according to the BLEN programmed (by default all BLEN are
42 * set).
43 */
44 for (i = 0; i < AXI_BLEN; i++) {
45 switch (axi->axi_blen[i]) {
46 case 256:
47 value |= DMA_AXI_BLEN256;
48 break;
49 case 128:
50 value |= DMA_AXI_BLEN128;
51 break;
52 case 64:
53 value |= DMA_AXI_BLEN64;
54 break;
55 case 32:
56 value |= DMA_AXI_BLEN32;
57 break;
58 case 16:
59 value |= DMA_AXI_BLEN16;
60 break;
61 case 8:
62 value |= DMA_AXI_BLEN8;
63 break;
64 case 4:
65 value |= DMA_AXI_BLEN4;
66 break;
67 }
68 }
69
70 writel(value, ioaddr + DMA_AXI_BUS_MODE);
71 }
72
dwmac1000_dma_init(void __iomem * ioaddr,struct stmmac_dma_cfg * dma_cfg,int atds)73 static void dwmac1000_dma_init(void __iomem *ioaddr,
74 struct stmmac_dma_cfg *dma_cfg, int atds)
75 {
76 u32 value = readl(ioaddr + DMA_BUS_MODE);
77 int txpbl = dma_cfg->txpbl ?: dma_cfg->pbl;
78 int rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl;
79
80 /*
81 * Set the DMA PBL (Programmable Burst Length) mode.
82 *
83 * Note: before stmmac core 3.50 this mode bit was 4xPBL, and
84 * post 3.5 mode bit acts as 8*PBL.
85 */
86 if (dma_cfg->pblx8)
87 value |= DMA_BUS_MODE_MAXPBL;
88 value |= DMA_BUS_MODE_USP;
89 value &= ~(DMA_BUS_MODE_PBL_MASK | DMA_BUS_MODE_RPBL_MASK);
90 value |= (txpbl << DMA_BUS_MODE_PBL_SHIFT);
91 value |= (rxpbl << DMA_BUS_MODE_RPBL_SHIFT);
92
93 /* Set the Fixed burst mode */
94 if (dma_cfg->fixed_burst)
95 value |= DMA_BUS_MODE_FB;
96
97 /* Mixed Burst has no effect when fb is set */
98 if (dma_cfg->mixed_burst)
99 value |= DMA_BUS_MODE_MB;
100
101 if (atds)
102 value |= DMA_BUS_MODE_ATDS;
103
104 if (dma_cfg->aal)
105 value |= DMA_BUS_MODE_AAL;
106
107 writel(value, ioaddr + DMA_BUS_MODE);
108
109 /* Mask interrupts by writing to CSR7 */
110 writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
111 }
112
dwmac1000_dma_init_rx(void __iomem * ioaddr,struct stmmac_dma_cfg * dma_cfg,dma_addr_t dma_rx_phy,u32 chan)113 static void dwmac1000_dma_init_rx(void __iomem *ioaddr,
114 struct stmmac_dma_cfg *dma_cfg,
115 dma_addr_t dma_rx_phy, u32 chan)
116 {
117 /* RX descriptor base address list must be written into DMA CSR3 */
118 writel(lower_32_bits(dma_rx_phy), ioaddr + DMA_RCV_BASE_ADDR);
119 }
120
dwmac1000_dma_init_tx(void __iomem * ioaddr,struct stmmac_dma_cfg * dma_cfg,dma_addr_t dma_tx_phy,u32 chan)121 static void dwmac1000_dma_init_tx(void __iomem *ioaddr,
122 struct stmmac_dma_cfg *dma_cfg,
123 dma_addr_t dma_tx_phy, u32 chan)
124 {
125 /* TX descriptor base address list must be written into DMA CSR4 */
126 writel(lower_32_bits(dma_tx_phy), ioaddr + DMA_TX_BASE_ADDR);
127 }
128
dwmac1000_configure_fc(u32 csr6,int rxfifosz)129 static u32 dwmac1000_configure_fc(u32 csr6, int rxfifosz)
130 {
131 csr6 &= ~DMA_CONTROL_RFA_MASK;
132 csr6 &= ~DMA_CONTROL_RFD_MASK;
133
134 /* Leave flow control disabled if receive fifo size is less than
135 * 4K or 0. Otherwise, send XOFF when fifo is 1K less than full,
136 * and send XON when 2K less than full.
137 */
138 if (rxfifosz < 4096) {
139 csr6 &= ~DMA_CONTROL_EFC;
140 pr_debug("GMAC: disabling flow control, rxfifo too small(%d)\n",
141 rxfifosz);
142 } else {
143 csr6 |= DMA_CONTROL_EFC;
144 csr6 |= RFA_FULL_MINUS_1K;
145 csr6 |= RFD_FULL_MINUS_2K;
146 }
147 return csr6;
148 }
149
dwmac1000_dma_operation_mode_rx(void __iomem * ioaddr,int mode,u32 channel,int fifosz,u8 qmode)150 static void dwmac1000_dma_operation_mode_rx(void __iomem *ioaddr, int mode,
151 u32 channel, int fifosz, u8 qmode)
152 {
153 u32 csr6 = readl(ioaddr + DMA_CONTROL);
154
155 if (mode == SF_DMA_MODE) {
156 pr_debug("GMAC: enable RX store and forward mode\n");
157 csr6 |= DMA_CONTROL_RSF;
158 } else {
159 pr_debug("GMAC: disable RX SF mode (threshold %d)\n", mode);
160 csr6 &= ~DMA_CONTROL_RSF;
161 csr6 &= DMA_CONTROL_TC_RX_MASK;
162 if (mode <= 32)
163 csr6 |= DMA_CONTROL_RTC_32;
164 else if (mode <= 64)
165 csr6 |= DMA_CONTROL_RTC_64;
166 else if (mode <= 96)
167 csr6 |= DMA_CONTROL_RTC_96;
168 else
169 csr6 |= DMA_CONTROL_RTC_128;
170 }
171
172 /* Configure flow control based on rx fifo size */
173 csr6 = dwmac1000_configure_fc(csr6, fifosz);
174
175 writel(csr6, ioaddr + DMA_CONTROL);
176 }
177
dwmac1000_dma_operation_mode_tx(void __iomem * ioaddr,int mode,u32 channel,int fifosz,u8 qmode)178 static void dwmac1000_dma_operation_mode_tx(void __iomem *ioaddr, int mode,
179 u32 channel, int fifosz, u8 qmode)
180 {
181 u32 csr6 = readl(ioaddr + DMA_CONTROL);
182
183 if (mode == SF_DMA_MODE) {
184 pr_debug("GMAC: enable TX store and forward mode\n");
185 /* Transmit COE type 2 cannot be done in cut-through mode. */
186 csr6 |= DMA_CONTROL_TSF;
187 /* Operating on second frame increase the performance
188 * especially when transmit store-and-forward is used.
189 */
190 csr6 |= DMA_CONTROL_OSF;
191 } else {
192 pr_debug("GMAC: disabling TX SF (threshold %d)\n", mode);
193 csr6 &= ~DMA_CONTROL_TSF;
194 csr6 &= DMA_CONTROL_TC_TX_MASK;
195 /* Set the transmit threshold */
196 if (mode <= 32)
197 csr6 |= DMA_CONTROL_TTC_32;
198 else if (mode <= 64)
199 csr6 |= DMA_CONTROL_TTC_64;
200 else if (mode <= 128)
201 csr6 |= DMA_CONTROL_TTC_128;
202 else if (mode <= 192)
203 csr6 |= DMA_CONTROL_TTC_192;
204 else
205 csr6 |= DMA_CONTROL_TTC_256;
206 }
207
208 writel(csr6, ioaddr + DMA_CONTROL);
209 }
210
dwmac1000_dump_dma_regs(void __iomem * ioaddr,u32 * reg_space)211 static void dwmac1000_dump_dma_regs(void __iomem *ioaddr, u32 *reg_space)
212 {
213 int i;
214
215 for (i = 0; i < NUM_DWMAC1000_DMA_REGS; i++)
216 if ((i < 12) || (i > 17))
217 reg_space[DMA_BUS_MODE / 4 + i] =
218 readl(ioaddr + DMA_BUS_MODE + i * 4);
219 }
220
dwmac1000_get_hw_feature(void __iomem * ioaddr,struct dma_features * dma_cap)221 static void dwmac1000_get_hw_feature(void __iomem *ioaddr,
222 struct dma_features *dma_cap)
223 {
224 u32 hw_cap = readl(ioaddr + DMA_HW_FEATURE);
225
226 dma_cap->mbps_10_100 = (hw_cap & DMA_HW_FEAT_MIISEL);
227 dma_cap->mbps_1000 = (hw_cap & DMA_HW_FEAT_GMIISEL) >> 1;
228 dma_cap->half_duplex = (hw_cap & DMA_HW_FEAT_HDSEL) >> 2;
229 dma_cap->hash_filter = (hw_cap & DMA_HW_FEAT_HASHSEL) >> 4;
230 dma_cap->multi_addr = (hw_cap & DMA_HW_FEAT_ADDMAC) >> 5;
231 dma_cap->pcs = (hw_cap & DMA_HW_FEAT_PCSSEL) >> 6;
232 dma_cap->sma_mdio = (hw_cap & DMA_HW_FEAT_SMASEL) >> 8;
233 dma_cap->pmt_remote_wake_up = (hw_cap & DMA_HW_FEAT_RWKSEL) >> 9;
234 dma_cap->pmt_magic_frame = (hw_cap & DMA_HW_FEAT_MGKSEL) >> 10;
235 /* MMC */
236 dma_cap->rmon = (hw_cap & DMA_HW_FEAT_MMCSEL) >> 11;
237 /* IEEE 1588-2002 */
238 dma_cap->time_stamp =
239 (hw_cap & DMA_HW_FEAT_TSVER1SEL) >> 12;
240 /* IEEE 1588-2008 */
241 dma_cap->atime_stamp = (hw_cap & DMA_HW_FEAT_TSVER2SEL) >> 13;
242 /* 802.3az - Energy-Efficient Ethernet (EEE) */
243 dma_cap->eee = (hw_cap & DMA_HW_FEAT_EEESEL) >> 14;
244 dma_cap->av = (hw_cap & DMA_HW_FEAT_AVSEL) >> 15;
245 /* TX and RX csum */
246 dma_cap->tx_coe = (hw_cap & DMA_HW_FEAT_TXCOESEL) >> 16;
247 dma_cap->rx_coe_type1 = (hw_cap & DMA_HW_FEAT_RXTYP1COE) >> 17;
248 dma_cap->rx_coe_type2 = (hw_cap & DMA_HW_FEAT_RXTYP2COE) >> 18;
249 dma_cap->rxfifo_over_2048 = (hw_cap & DMA_HW_FEAT_RXFIFOSIZE) >> 19;
250 /* TX and RX number of channels */
251 dma_cap->number_rx_channel = (hw_cap & DMA_HW_FEAT_RXCHCNT) >> 20;
252 dma_cap->number_tx_channel = (hw_cap & DMA_HW_FEAT_TXCHCNT) >> 22;
253 /* Alternate (enhanced) DESC mode */
254 dma_cap->enh_desc = (hw_cap & DMA_HW_FEAT_ENHDESSEL) >> 24;
255 }
256
dwmac1000_rx_watchdog(void __iomem * ioaddr,u32 riwt,u32 number_chan)257 static void dwmac1000_rx_watchdog(void __iomem *ioaddr, u32 riwt,
258 u32 number_chan)
259 {
260 writel(riwt, ioaddr + DMA_RX_WATCHDOG);
261 }
262
263 const struct stmmac_dma_ops dwmac1000_dma_ops = {
264 .reset = dwmac_dma_reset,
265 .init = dwmac1000_dma_init,
266 .init_rx_chan = dwmac1000_dma_init_rx,
267 .init_tx_chan = dwmac1000_dma_init_tx,
268 .axi = dwmac1000_dma_axi,
269 .dump_regs = dwmac1000_dump_dma_regs,
270 .dma_rx_mode = dwmac1000_dma_operation_mode_rx,
271 .dma_tx_mode = dwmac1000_dma_operation_mode_tx,
272 .enable_dma_transmission = dwmac_enable_dma_transmission,
273 .enable_dma_irq = dwmac_enable_dma_irq,
274 .disable_dma_irq = dwmac_disable_dma_irq,
275 .start_tx = dwmac_dma_start_tx,
276 .stop_tx = dwmac_dma_stop_tx,
277 .start_rx = dwmac_dma_start_rx,
278 .stop_rx = dwmac_dma_stop_rx,
279 .dma_interrupt = dwmac_dma_interrupt,
280 .get_hw_feature = dwmac1000_get_hw_feature,
281 .rx_watchdog = dwmac1000_rx_watchdog,
282 };
283
