1 /*******************************************************************************
2 This is the driver for the GMAC on-chip Ethernet controller for ST SoCs.
3 DWC Ether MAC 10/100/1000 Universal version 3.41a has been used for
6 This contains the functions to handle the dma.
8 Copyright (C) 2007-2009 STMicroelectronics Ltd
10 This program is free software; you can redistribute it and/or modify it
11 under the terms and conditions of the GNU General Public License,
12 version 2, as published by the Free Software Foundation.
14 This program is distributed in the hope it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 You should have received a copy of the GNU General Public License along with
20 this program; if not, write to the Free Software Foundation, Inc.,
21 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
23 The full GNU General Public License is included in this distribution in
24 the file called "COPYING".
26 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
27 *******************************************************************************/
30 #include "dwmac1000.h"
31 #include "dwmac_dma.h"
33 static int dwmac1000_dma_init(void __iomem *ioaddr, int pbl, int fb, int mb,
34 int burst_len, u32 dma_tx, u32 dma_rx, int atds)
36 u32 value = readl(ioaddr + DMA_BUS_MODE);
40 value |= DMA_BUS_MODE_SFT_RESET;
41 writel(value, ioaddr + DMA_BUS_MODE);
44 if (!(readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET))
52 * Set the DMA PBL (Programmable Burst Length) mode
53 * Before stmmac core 3.50 this mode bit was 4xPBL, and
54 * post 3.5 mode bit acts as 8*PBL.
55 * For core rev < 3.5, when the core is set for 4xPBL mode, the
56 * DMA transfers the data in 4, 8, 16, 32, 64 & 128 beats
57 * depending on pbl value.
58 * For core rev > 3.5, when the core is set for 8xPBL mode, the
59 * DMA transfers the data in 8, 16, 32, 64, 128 & 256 beats
60 * depending on pbl value.
62 value = DMA_BUS_MODE_PBL | ((pbl << DMA_BUS_MODE_PBL_SHIFT) |
63 (pbl << DMA_BUS_MODE_RPBL_SHIFT));
65 /* Set the Fixed burst mode */
67 value |= DMA_BUS_MODE_FB;
69 /* Mixed Burst has no effect when fb is set */
71 value |= DMA_BUS_MODE_MB;
74 value |= DMA_BUS_MODE_ATDS;
76 writel(value, ioaddr + DMA_BUS_MODE);
78 /* In case of GMAC AXI configuration, program the DMA_AXI_BUS_MODE
79 * for supported bursts.
81 * Note: This is applicable only for revision GMACv3.61a. For
82 * older version this register is reserved and shall have no
86 * For Fixed Burst Mode: if we directly write 0xFF to this
87 * register using the configurations pass from platform code,
88 * this would ensure that all bursts supported by core are set
89 * and those which are not supported would remain ineffective.
91 * For Non Fixed Burst Mode: provide the maximum value of the
92 * burst length. Any burst equal or below the provided burst
93 * length would be allowed to perform.
95 writel(burst_len, ioaddr + DMA_AXI_BUS_MODE);
97 /* Mask interrupts by writing to CSR7 */
98 writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
100 /* RX/TX descriptor base address lists must be written into
101 * DMA CSR3 and CSR4, respectively
103 writel(dma_tx, ioaddr + DMA_TX_BASE_ADDR);
104 writel(dma_rx, ioaddr + DMA_RCV_BASE_ADDR);
109 static u32 dwmac1000_configure_fc(u32 csr6, int rxfifosz)
111 csr6 &= ~DMA_CONTROL_RFA_MASK;
112 csr6 &= ~DMA_CONTROL_RFD_MASK;
114 /* Leave flow control disabled if receive fifo size is less than
115 * 4K or 0. Otherwise, send XOFF when fifo is 1K less than full,
116 * and send XON when 2K less than full.
118 if (rxfifosz < 4096) {
119 csr6 &= ~DMA_CONTROL_EFC;
120 pr_debug("GMAC: disabling flow control, rxfifo too small(%d)\n",
123 csr6 |= DMA_CONTROL_EFC;
124 csr6 |= RFA_FULL_MINUS_1K;
125 csr6 |= RFD_FULL_MINUS_2K;
130 static void dwmac1000_dma_operation_mode(void __iomem *ioaddr, int txmode,
131 int rxmode, int rxfifosz)
133 u32 csr6 = readl(ioaddr + DMA_CONTROL);
135 if (txmode == SF_DMA_MODE) {
136 pr_debug("GMAC: enable TX store and forward mode\n");
137 /* Transmit COE type 2 cannot be done in cut-through mode. */
138 csr6 |= DMA_CONTROL_TSF;
139 /* Operating on second frame increase the performance
140 * especially when transmit store-and-forward is used.
142 csr6 |= DMA_CONTROL_OSF;
144 pr_debug("GMAC: disabling TX SF (threshold %d)\n", txmode);
145 csr6 &= ~DMA_CONTROL_TSF;
146 csr6 &= DMA_CONTROL_TC_TX_MASK;
147 /* Set the transmit threshold */
149 csr6 |= DMA_CONTROL_TTC_32;
150 else if (txmode <= 64)
151 csr6 |= DMA_CONTROL_TTC_64;
152 else if (txmode <= 128)
153 csr6 |= DMA_CONTROL_TTC_128;
154 else if (txmode <= 192)
155 csr6 |= DMA_CONTROL_TTC_192;
157 csr6 |= DMA_CONTROL_TTC_256;
160 if (rxmode == SF_DMA_MODE) {
161 pr_debug("GMAC: enable RX store and forward mode\n");
162 csr6 |= DMA_CONTROL_RSF;
164 pr_debug("GMAC: disable RX SF mode (threshold %d)\n", rxmode);
165 csr6 &= ~DMA_CONTROL_RSF;
166 csr6 &= DMA_CONTROL_TC_RX_MASK;
168 csr6 |= DMA_CONTROL_RTC_32;
169 else if (rxmode <= 64)
170 csr6 |= DMA_CONTROL_RTC_64;
171 else if (rxmode <= 96)
172 csr6 |= DMA_CONTROL_RTC_96;
174 csr6 |= DMA_CONTROL_RTC_128;
177 /* Configure flow control based on rx fifo size */
178 csr6 = dwmac1000_configure_fc(csr6, rxfifosz);
180 writel(csr6, ioaddr + DMA_CONTROL);
183 static void dwmac1000_dump_dma_regs(void __iomem *ioaddr)
186 pr_info(" DMA registers\n");
187 for (i = 0; i < 22; i++) {
188 if ((i < 9) || (i > 17)) {
190 pr_err("\t Reg No. %d (offset 0x%x): 0x%08x\n", i,
191 (DMA_BUS_MODE + offset),
192 readl(ioaddr + DMA_BUS_MODE + offset));
197 static unsigned int dwmac1000_get_hw_feature(void __iomem *ioaddr)
199 return readl(ioaddr + DMA_HW_FEATURE);
202 static void dwmac1000_rx_watchdog(void __iomem *ioaddr, u32 riwt)
204 writel(riwt, ioaddr + DMA_RX_WATCHDOG);
207 const struct stmmac_dma_ops dwmac1000_dma_ops = {
208 .init = dwmac1000_dma_init,
209 .dump_regs = dwmac1000_dump_dma_regs,
210 .dma_mode = dwmac1000_dma_operation_mode,
211 .enable_dma_transmission = dwmac_enable_dma_transmission,
212 .enable_dma_irq = dwmac_enable_dma_irq,
213 .disable_dma_irq = dwmac_disable_dma_irq,
214 .start_tx = dwmac_dma_start_tx,
215 .stop_tx = dwmac_dma_stop_tx,
216 .start_rx = dwmac_dma_start_rx,
217 .stop_rx = dwmac_dma_stop_rx,
218 .dma_interrupt = dwmac_dma_interrupt,
219 .get_hw_feature = dwmac1000_get_hw_feature,
220 .rx_watchdog = dwmac1000_rx_watchdog,