1 /*******************************************************************************
2 Copyright (C) 2007-2009 STMicroelectronics Ltd
4 This program is free software; you can redistribute it and/or modify it
5 under the terms and conditions of the GNU General Public License,
6 version 2, as published by the Free Software Foundation.
8 This program is distributed in the hope it will be useful, but WITHOUT
9 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 You should have received a copy of the GNU General Public License along with
14 this program; if not, write to the Free Software Foundation, Inc.,
15 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17 The full GNU General Public License is included in this distribution in
18 the file called "COPYING".
20 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
21 *******************************************************************************/
25 #include "dwmac_dma.h"
27 #define GMAC_HI_REG_AE 0x80000000
29 /* CSR1 enables the transmit DMA to check for new descriptor */
30 void dwmac_enable_dma_transmission(void __iomem *ioaddr)
32 writel(1, ioaddr + DMA_XMT_POLL_DEMAND);
35 void dwmac_enable_dma_irq(void __iomem *ioaddr)
37 writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
40 void dwmac_disable_dma_irq(void __iomem *ioaddr)
42 writel(0, ioaddr + DMA_INTR_ENA);
45 void dwmac_dma_start_tx(void __iomem *ioaddr)
47 u32 value = readl(ioaddr + DMA_CONTROL);
48 value |= DMA_CONTROL_ST;
49 writel(value, ioaddr + DMA_CONTROL);
52 void dwmac_dma_stop_tx(void __iomem *ioaddr)
54 u32 value = readl(ioaddr + DMA_CONTROL);
55 value &= ~DMA_CONTROL_ST;
56 writel(value, ioaddr + DMA_CONTROL);
59 void dwmac_dma_start_rx(void __iomem *ioaddr)
61 u32 value = readl(ioaddr + DMA_CONTROL);
62 value |= DMA_CONTROL_SR;
63 writel(value, ioaddr + DMA_CONTROL);
66 void dwmac_dma_stop_rx(void __iomem *ioaddr)
68 u32 value = readl(ioaddr + DMA_CONTROL);
69 value &= ~DMA_CONTROL_SR;
70 writel(value, ioaddr + DMA_CONTROL);
73 #ifdef DWMAC_DMA_DEBUG
74 static void show_tx_process_state(unsigned int status)
77 state = (status & DMA_STATUS_TS_MASK) >> DMA_STATUS_TS_SHIFT;
81 pr_debug("- TX (Stopped): Reset or Stop command\n");
84 pr_debug("- TX (Running):Fetching the Tx desc\n");
87 pr_debug("- TX (Running): Waiting for end of tx\n");
90 pr_debug("- TX (Running): Reading the data "
91 "and queuing the data into the Tx buf\n");
94 pr_debug("- TX (Suspended): Tx Buff Underflow "
95 "or an unavailable Transmit descriptor\n");
98 pr_debug("- TX (Running): Closing Tx descriptor\n");
105 static void show_rx_process_state(unsigned int status)
108 state = (status & DMA_STATUS_RS_MASK) >> DMA_STATUS_RS_SHIFT;
112 pr_debug("- RX (Stopped): Reset or Stop command\n");
115 pr_debug("- RX (Running): Fetching the Rx desc\n");
118 pr_debug("- RX (Running):Checking for end of pkt\n");
121 pr_debug("- RX (Running): Waiting for Rx pkt\n");
124 pr_debug("- RX (Suspended): Unavailable Rx buf\n");
127 pr_debug("- RX (Running): Closing Rx descriptor\n");
130 pr_debug("- RX(Running): Flushing the current frame"
131 " from the Rx buf\n");
134 pr_debug("- RX (Running): Queuing the Rx frame"
135 " from the Rx buf into memory\n");
143 int dwmac_dma_interrupt(void __iomem *ioaddr,
144 struct stmmac_extra_stats *x)
147 /* read the status register (CSR5) */
148 u32 intr_status = readl(ioaddr + DMA_STATUS);
150 #ifdef DWMAC_DMA_DEBUG
151 /* Enable it to monitor DMA rx/tx status in case of critical problems */
152 pr_debug("%s: [CSR5: 0x%08x]\n", __func__, intr_status);
153 show_tx_process_state(intr_status);
154 show_rx_process_state(intr_status);
156 /* ABNORMAL interrupts */
157 if (unlikely(intr_status & DMA_STATUS_AIS)) {
158 if (unlikely(intr_status & DMA_STATUS_UNF)) {
159 ret = tx_hard_error_bump_tc;
160 x->tx_undeflow_irq++;
162 if (unlikely(intr_status & DMA_STATUS_TJT))
165 if (unlikely(intr_status & DMA_STATUS_OVF))
166 x->rx_overflow_irq++;
168 if (unlikely(intr_status & DMA_STATUS_RU))
169 x->rx_buf_unav_irq++;
170 if (unlikely(intr_status & DMA_STATUS_RPS))
171 x->rx_process_stopped_irq++;
172 if (unlikely(intr_status & DMA_STATUS_RWT))
173 x->rx_watchdog_irq++;
174 if (unlikely(intr_status & DMA_STATUS_ETI))
176 if (unlikely(intr_status & DMA_STATUS_TPS)) {
177 x->tx_process_stopped_irq++;
180 if (unlikely(intr_status & DMA_STATUS_FBI)) {
181 x->fatal_bus_error_irq++;
185 /* TX/RX NORMAL interrupts */
186 if (likely(intr_status & DMA_STATUS_NIS)) {
188 if (likely(intr_status & DMA_STATUS_RI)) {
189 u32 value = readl(ioaddr + DMA_INTR_ENA);
190 /* to schedule NAPI on real RIE event. */
191 if (likely(value & DMA_INTR_ENA_RIE)) {
192 x->rx_normal_irq_n++;
196 if (likely(intr_status & DMA_STATUS_TI)) {
197 x->tx_normal_irq_n++;
200 if (unlikely(intr_status & DMA_STATUS_ERI))
203 /* Optional hardware blocks, interrupts should be disabled */
204 if (unlikely(intr_status &
205 (DMA_STATUS_GPI | DMA_STATUS_GMI | DMA_STATUS_GLI)))
206 pr_warn("%s: unexpected status %08x\n", __func__, intr_status);
208 /* Clear the interrupt by writing a logic 1 to the CSR5[15-0] */
209 writel((intr_status & 0x1ffff), ioaddr + DMA_STATUS);
214 void dwmac_dma_flush_tx_fifo(void __iomem *ioaddr)
216 u32 csr6 = readl(ioaddr + DMA_CONTROL);
217 writel((csr6 | DMA_CONTROL_FTF), ioaddr + DMA_CONTROL);
219 do {} while ((readl(ioaddr + DMA_CONTROL) & DMA_CONTROL_FTF));
222 void stmmac_set_mac_addr(void __iomem *ioaddr, u8 addr[6],
223 unsigned int high, unsigned int low)
227 data = (addr[5] << 8) | addr[4];
228 /* For MAC Addr registers se have to set the Address Enable (AE)
229 * bit that has no effect on the High Reg 0 where the bit 31 (MO)
232 writel(data | GMAC_HI_REG_AE, ioaddr + high);
233 data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
234 writel(data, ioaddr + low);
237 /* Enable disable MAC RX/TX */
238 void stmmac_set_mac(void __iomem *ioaddr, bool enable)
240 u32 value = readl(ioaddr + MAC_CTRL_REG);
243 value |= MAC_RNABLE_RX | MAC_ENABLE_TX;
245 value &= ~(MAC_ENABLE_TX | MAC_RNABLE_RX);
247 writel(value, ioaddr + MAC_CTRL_REG);
250 void stmmac_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
251 unsigned int high, unsigned int low)
253 unsigned int hi_addr, lo_addr;
255 /* Read the MAC address from the hardware */
256 hi_addr = readl(ioaddr + high);
257 lo_addr = readl(ioaddr + low);
259 /* Extract the MAC address from the high and low words */
260 addr[0] = lo_addr & 0xff;
261 addr[1] = (lo_addr >> 8) & 0xff;
262 addr[2] = (lo_addr >> 16) & 0xff;
263 addr[3] = (lo_addr >> 24) & 0xff;
264 addr[4] = hi_addr & 0xff;
265 addr[5] = (hi_addr >> 8) & 0xff;