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1/*******************************************************************************
2 Copyright (C) 2007-2009 STMicroelectronics Ltd
3
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.
7
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
11 more details.
12
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.
16
17 The full GNU General Public License is included in this distribution in
18 the file called "COPYING".
19
20 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
21*******************************************************************************/
22
23#include <linux/io.h>
24#include "common.h"
25#include "dwmac_dma.h"
26
27#undef DWMAC_DMA_DEBUG
28#ifdef DWMAC_DMA_DEBUG
29#define DWMAC_LIB_DBG(fmt, args...) printk(fmt, ## args)
30#else
31#define DWMAC_LIB_DBG(fmt, args...) do { } while (0)
32#endif
33
34/* CSR1 enables the transmit DMA to check for new descriptor */
35void dwmac_enable_dma_transmission(void __iomem *ioaddr)
36{
37 writel(1, ioaddr + DMA_XMT_POLL_DEMAND);
38}
39
40void dwmac_enable_dma_irq(void __iomem *ioaddr)
41{
42 writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
43}
44
45void dwmac_disable_dma_irq(void __iomem *ioaddr)
46{
47 writel(0, ioaddr + DMA_INTR_ENA);
48}
49
50void dwmac_dma_start_tx(void __iomem *ioaddr)
51{
52 u32 value = readl(ioaddr + DMA_CONTROL);
53 value |= DMA_CONTROL_ST;
54 writel(value, ioaddr + DMA_CONTROL);
55}
56
57void dwmac_dma_stop_tx(void __iomem *ioaddr)
58{
59 u32 value = readl(ioaddr + DMA_CONTROL);
60 value &= ~DMA_CONTROL_ST;
61 writel(value, ioaddr + DMA_CONTROL);
62}
63
64void dwmac_dma_start_rx(void __iomem *ioaddr)
65{
66 u32 value = readl(ioaddr + DMA_CONTROL);
67 value |= DMA_CONTROL_SR;
68 writel(value, ioaddr + DMA_CONTROL);
69}
70
71void dwmac_dma_stop_rx(void __iomem *ioaddr)
72{
73 u32 value = readl(ioaddr + DMA_CONTROL);
74 value &= ~DMA_CONTROL_SR;
75 writel(value, ioaddr + DMA_CONTROL);
76}
77
78#ifdef DWMAC_DMA_DEBUG
79static void show_tx_process_state(unsigned int status)
80{
81 unsigned int state;
82 state = (status & DMA_STATUS_TS_MASK) >> DMA_STATUS_TS_SHIFT;
83
84 switch (state) {
85 case 0:
86 pr_info("- TX (Stopped): Reset or Stop command\n");
87 break;
88 case 1:
89 pr_info("- TX (Running):Fetching the Tx desc\n");
90 break;
91 case 2:
92 pr_info("- TX (Running): Waiting for end of tx\n");
93 break;
94 case 3:
95 pr_info("- TX (Running): Reading the data "
96 "and queuing the data into the Tx buf\n");
97 break;
98 case 6:
99 pr_info("- TX (Suspended): Tx Buff Underflow "
100 "or an unavailable Transmit descriptor\n");
101 break;
102 case 7:
103 pr_info("- TX (Running): Closing Tx descriptor\n");
104 break;
105 default:
106 break;
107 }
108}
109
110static void show_rx_process_state(unsigned int status)
111{
112 unsigned int state;
113 state = (status & DMA_STATUS_RS_MASK) >> DMA_STATUS_RS_SHIFT;
114
115 switch (state) {
116 case 0:
117 pr_info("- RX (Stopped): Reset or Stop command\n");
118 break;
119 case 1:
120 pr_info("- RX (Running): Fetching the Rx desc\n");
121 break;
122 case 2:
123 pr_info("- RX (Running):Checking for end of pkt\n");
124 break;
125 case 3:
126 pr_info("- RX (Running): Waiting for Rx pkt\n");
127 break;
128 case 4:
129 pr_info("- RX (Suspended): Unavailable Rx buf\n");
130 break;
131 case 5:
132 pr_info("- RX (Running): Closing Rx descriptor\n");
133 break;
134 case 6:
135 pr_info("- RX(Running): Flushing the current frame"
136 " from the Rx buf\n");
137 break;
138 case 7:
139 pr_info("- RX (Running): Queuing the Rx frame"
140 " from the Rx buf into memory\n");
141 break;
142 default:
143 break;
144 }
145}
146#endif
147
148int dwmac_dma_interrupt(void __iomem *ioaddr,
149 struct stmmac_extra_stats *x)
150{
151 int ret = 0;
152 /* read the status register (CSR5) */
153 u32 intr_status = readl(ioaddr + DMA_STATUS);
154
155 DWMAC_LIB_DBG(KERN_INFO "%s: [CSR5: 0x%08x]\n", __func__, intr_status);
156#ifdef DWMAC_DMA_DEBUG
157 /* It displays the DMA process states (CSR5 register) */
158 show_tx_process_state(intr_status);
159 show_rx_process_state(intr_status);
160#endif
161 /* ABNORMAL interrupts */
162 if (unlikely(intr_status & DMA_STATUS_AIS)) {
163 DWMAC_LIB_DBG(KERN_INFO "CSR5[15] DMA ABNORMAL IRQ: ");
164 if (unlikely(intr_status & DMA_STATUS_UNF)) {
165 DWMAC_LIB_DBG(KERN_INFO "transmit underflow\n");
166 ret = tx_hard_error_bump_tc;
167 x->tx_undeflow_irq++;
168 }
169 if (unlikely(intr_status & DMA_STATUS_TJT)) {
170 DWMAC_LIB_DBG(KERN_INFO "transmit jabber\n");
171 x->tx_jabber_irq++;
172 }
173 if (unlikely(intr_status & DMA_STATUS_OVF)) {
174 DWMAC_LIB_DBG(KERN_INFO "recv overflow\n");
175 x->rx_overflow_irq++;
176 }
177 if (unlikely(intr_status & DMA_STATUS_RU)) {
178 DWMAC_LIB_DBG(KERN_INFO "receive buffer unavailable\n");
179 x->rx_buf_unav_irq++;
180 }
181 if (unlikely(intr_status & DMA_STATUS_RPS)) {
182 DWMAC_LIB_DBG(KERN_INFO "receive process stopped\n");
183 x->rx_process_stopped_irq++;
184 }
185 if (unlikely(intr_status & DMA_STATUS_RWT)) {
186 DWMAC_LIB_DBG(KERN_INFO "receive watchdog\n");
187 x->rx_watchdog_irq++;
188 }
189 if (unlikely(intr_status & DMA_STATUS_ETI)) {
190 DWMAC_LIB_DBG(KERN_INFO "transmit early interrupt\n");
191 x->tx_early_irq++;
192 }
193 if (unlikely(intr_status & DMA_STATUS_TPS)) {
194 DWMAC_LIB_DBG(KERN_INFO "transmit process stopped\n");
195 x->tx_process_stopped_irq++;
196 ret = tx_hard_error;
197 }
198 if (unlikely(intr_status & DMA_STATUS_FBI)) {
199 DWMAC_LIB_DBG(KERN_INFO "fatal bus error\n");
200 x->fatal_bus_error_irq++;
201 ret = tx_hard_error;
202 }
203 }
204 /* TX/RX NORMAL interrupts */
205 if (intr_status & DMA_STATUS_NIS) {
206 x->normal_irq_n++;
207 if (likely((intr_status & DMA_STATUS_RI) ||
208 (intr_status & (DMA_STATUS_TI))))
209 ret = handle_tx_rx;
210 }
211 /* Optional hardware blocks, interrupts should be disabled */
212 if (unlikely(intr_status &
213 (DMA_STATUS_GPI | DMA_STATUS_GMI | DMA_STATUS_GLI)))
214 pr_info("%s: unexpected status %08x\n", __func__, intr_status);
215 /* Clear the interrupt by writing a logic 1 to the CSR5[15-0] */
216 writel((intr_status & 0x1ffff), ioaddr + DMA_STATUS);
217
218 DWMAC_LIB_DBG(KERN_INFO "\n\n");
219 return ret;
220}
221
222void dwmac_dma_flush_tx_fifo(void __iomem *ioaddr)
223{
224 u32 csr6 = readl(ioaddr + DMA_CONTROL);
225 writel((csr6 | DMA_CONTROL_FTF), ioaddr + DMA_CONTROL);
226
227 do {} while ((readl(ioaddr + DMA_CONTROL) & DMA_CONTROL_FTF));
228}
229
230void stmmac_set_mac_addr(void __iomem *ioaddr, u8 addr[6],
231 unsigned int high, unsigned int low)
232{
233 unsigned long data;
234
235 data = (addr[5] << 8) | addr[4];
236 writel(data, ioaddr + high);
237 data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
238 writel(data, ioaddr + low);
239}
240
241void stmmac_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
242 unsigned int high, unsigned int low)
243{
244 unsigned int hi_addr, lo_addr;
245
246 /* Read the MAC address from the hardware */
247 hi_addr = readl(ioaddr + high);
248 lo_addr = readl(ioaddr + low);
249
250 /* Extract the MAC address from the high and low words */
251 addr[0] = lo_addr & 0xff;
252 addr[1] = (lo_addr >> 8) & 0xff;
253 addr[2] = (lo_addr >> 16) & 0xff;
254 addr[3] = (lo_addr >> 24) & 0xff;
255 addr[4] = hi_addr & 0xff;
256 addr[5] = (hi_addr >> 8) & 0xff;
257}
258