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[J-linux.git] / drivers / net / ethernet / stmicro / stmmac / dwmac_lib.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*******************************************************************************
3   Copyright (C) 2007-2009  STMicroelectronics Ltd
4
5
6   Author: Giuseppe Cavallaro <[email protected]>
7 *******************************************************************************/
8
9 #include <linux/io.h>
10 #include <linux/iopoll.h>
11 #include "common.h"
12 #include "dwmac_dma.h"
13
14 #define GMAC_HI_REG_AE          0x80000000
15
16 int dwmac_dma_reset(void __iomem *ioaddr)
17 {
18         u32 value = readl(ioaddr + DMA_BUS_MODE);
19
20         /* DMA SW reset */
21         value |= DMA_BUS_MODE_SFT_RESET;
22         writel(value, ioaddr + DMA_BUS_MODE);
23
24         return readl_poll_timeout(ioaddr + DMA_BUS_MODE, value,
25                                  !(value & DMA_BUS_MODE_SFT_RESET),
26                                  10000, 200000);
27 }
28
29 /* CSR1 enables the transmit DMA to check for new descriptor */
30 void dwmac_enable_dma_transmission(void __iomem *ioaddr)
31 {
32         writel(1, ioaddr + DMA_XMT_POLL_DEMAND);
33 }
34
35 void dwmac_enable_dma_irq(void __iomem *ioaddr, u32 chan, bool rx, bool tx)
36 {
37         u32 value = readl(ioaddr + DMA_INTR_ENA);
38
39         if (rx)
40                 value |= DMA_INTR_DEFAULT_RX;
41         if (tx)
42                 value |= DMA_INTR_DEFAULT_TX;
43
44         writel(value, ioaddr + DMA_INTR_ENA);
45 }
46
47 void dwmac_disable_dma_irq(void __iomem *ioaddr, u32 chan, bool rx, bool tx)
48 {
49         u32 value = readl(ioaddr + DMA_INTR_ENA);
50
51         if (rx)
52                 value &= ~DMA_INTR_DEFAULT_RX;
53         if (tx)
54                 value &= ~DMA_INTR_DEFAULT_TX;
55
56         writel(value, ioaddr + DMA_INTR_ENA);
57 }
58
59 void dwmac_dma_start_tx(void __iomem *ioaddr, u32 chan)
60 {
61         u32 value = readl(ioaddr + DMA_CONTROL);
62         value |= DMA_CONTROL_ST;
63         writel(value, ioaddr + DMA_CONTROL);
64 }
65
66 void dwmac_dma_stop_tx(void __iomem *ioaddr, u32 chan)
67 {
68         u32 value = readl(ioaddr + DMA_CONTROL);
69         value &= ~DMA_CONTROL_ST;
70         writel(value, ioaddr + DMA_CONTROL);
71 }
72
73 void dwmac_dma_start_rx(void __iomem *ioaddr, u32 chan)
74 {
75         u32 value = readl(ioaddr + DMA_CONTROL);
76         value |= DMA_CONTROL_SR;
77         writel(value, ioaddr + DMA_CONTROL);
78 }
79
80 void dwmac_dma_stop_rx(void __iomem *ioaddr, u32 chan)
81 {
82         u32 value = readl(ioaddr + DMA_CONTROL);
83         value &= ~DMA_CONTROL_SR;
84         writel(value, ioaddr + DMA_CONTROL);
85 }
86
87 #ifdef DWMAC_DMA_DEBUG
88 static void show_tx_process_state(unsigned int status)
89 {
90         unsigned int state;
91         state = (status & DMA_STATUS_TS_MASK) >> DMA_STATUS_TS_SHIFT;
92
93         switch (state) {
94         case 0:
95                 pr_debug("- TX (Stopped): Reset or Stop command\n");
96                 break;
97         case 1:
98                 pr_debug("- TX (Running): Fetching the Tx desc\n");
99                 break;
100         case 2:
101                 pr_debug("- TX (Running): Waiting for end of tx\n");
102                 break;
103         case 3:
104                 pr_debug("- TX (Running): Reading the data "
105                        "and queuing the data into the Tx buf\n");
106                 break;
107         case 6:
108                 pr_debug("- TX (Suspended): Tx Buff Underflow "
109                        "or an unavailable Transmit descriptor\n");
110                 break;
111         case 7:
112                 pr_debug("- TX (Running): Closing Tx descriptor\n");
113                 break;
114         default:
115                 break;
116         }
117 }
118
119 static void show_rx_process_state(unsigned int status)
120 {
121         unsigned int state;
122         state = (status & DMA_STATUS_RS_MASK) >> DMA_STATUS_RS_SHIFT;
123
124         switch (state) {
125         case 0:
126                 pr_debug("- RX (Stopped): Reset or Stop command\n");
127                 break;
128         case 1:
129                 pr_debug("- RX (Running): Fetching the Rx desc\n");
130                 break;
131         case 2:
132                 pr_debug("- RX (Running): Checking for end of pkt\n");
133                 break;
134         case 3:
135                 pr_debug("- RX (Running): Waiting for Rx pkt\n");
136                 break;
137         case 4:
138                 pr_debug("- RX (Suspended): Unavailable Rx buf\n");
139                 break;
140         case 5:
141                 pr_debug("- RX (Running): Closing Rx descriptor\n");
142                 break;
143         case 6:
144                 pr_debug("- RX(Running): Flushing the current frame"
145                        " from the Rx buf\n");
146                 break;
147         case 7:
148                 pr_debug("- RX (Running): Queuing the Rx frame"
149                        " from the Rx buf into memory\n");
150                 break;
151         default:
152                 break;
153         }
154 }
155 #endif
156
157 int dwmac_dma_interrupt(void __iomem *ioaddr,
158                         struct stmmac_extra_stats *x, u32 chan, u32 dir)
159 {
160         int ret = 0;
161         /* read the status register (CSR5) */
162         u32 intr_status = readl(ioaddr + DMA_STATUS);
163
164 #ifdef DWMAC_DMA_DEBUG
165         /* Enable it to monitor DMA rx/tx status in case of critical problems */
166         pr_debug("%s: [CSR5: 0x%08x]\n", __func__, intr_status);
167         show_tx_process_state(intr_status);
168         show_rx_process_state(intr_status);
169 #endif
170
171         if (dir == DMA_DIR_RX)
172                 intr_status &= DMA_STATUS_MSK_RX;
173         else if (dir == DMA_DIR_TX)
174                 intr_status &= DMA_STATUS_MSK_TX;
175
176         /* ABNORMAL interrupts */
177         if (unlikely(intr_status & DMA_STATUS_AIS)) {
178                 if (unlikely(intr_status & DMA_STATUS_UNF)) {
179                         ret = tx_hard_error_bump_tc;
180                         x->tx_undeflow_irq++;
181                 }
182                 if (unlikely(intr_status & DMA_STATUS_TJT))
183                         x->tx_jabber_irq++;
184
185                 if (unlikely(intr_status & DMA_STATUS_OVF))
186                         x->rx_overflow_irq++;
187
188                 if (unlikely(intr_status & DMA_STATUS_RU))
189                         x->rx_buf_unav_irq++;
190                 if (unlikely(intr_status & DMA_STATUS_RPS))
191                         x->rx_process_stopped_irq++;
192                 if (unlikely(intr_status & DMA_STATUS_RWT))
193                         x->rx_watchdog_irq++;
194                 if (unlikely(intr_status & DMA_STATUS_ETI))
195                         x->tx_early_irq++;
196                 if (unlikely(intr_status & DMA_STATUS_TPS)) {
197                         x->tx_process_stopped_irq++;
198                         ret = tx_hard_error;
199                 }
200                 if (unlikely(intr_status & DMA_STATUS_FBI)) {
201                         x->fatal_bus_error_irq++;
202                         ret = tx_hard_error;
203                 }
204         }
205         /* TX/RX NORMAL interrupts */
206         if (likely(intr_status & DMA_STATUS_NIS)) {
207                 x->normal_irq_n++;
208                 if (likely(intr_status & DMA_STATUS_RI)) {
209                         u32 value = readl(ioaddr + DMA_INTR_ENA);
210                         /* to schedule NAPI on real RIE event. */
211                         if (likely(value & DMA_INTR_ENA_RIE)) {
212                                 x->rx_normal_irq_n++;
213                                 ret |= handle_rx;
214                         }
215                 }
216                 if (likely(intr_status & DMA_STATUS_TI)) {
217                         x->tx_normal_irq_n++;
218                         ret |= handle_tx;
219                 }
220                 if (unlikely(intr_status & DMA_STATUS_ERI))
221                         x->rx_early_irq++;
222         }
223         /* Optional hardware blocks, interrupts should be disabled */
224         if (unlikely(intr_status &
225                      (DMA_STATUS_GPI | DMA_STATUS_GMI | DMA_STATUS_GLI)))
226                 pr_warn("%s: unexpected status %08x\n", __func__, intr_status);
227
228         /* Clear the interrupt by writing a logic 1 to the CSR5[15-0] */
229         writel((intr_status & 0x1ffff), ioaddr + DMA_STATUS);
230
231         return ret;
232 }
233
234 void dwmac_dma_flush_tx_fifo(void __iomem *ioaddr)
235 {
236         u32 csr6 = readl(ioaddr + DMA_CONTROL);
237         writel((csr6 | DMA_CONTROL_FTF), ioaddr + DMA_CONTROL);
238
239         do {} while ((readl(ioaddr + DMA_CONTROL) & DMA_CONTROL_FTF));
240 }
241
242 void stmmac_set_mac_addr(void __iomem *ioaddr, u8 addr[6],
243                          unsigned int high, unsigned int low)
244 {
245         unsigned long data;
246
247         data = (addr[5] << 8) | addr[4];
248         /* For MAC Addr registers we have to set the Address Enable (AE)
249          * bit that has no effect on the High Reg 0 where the bit 31 (MO)
250          * is RO.
251          */
252         writel(data | GMAC_HI_REG_AE, ioaddr + high);
253         data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
254         writel(data, ioaddr + low);
255 }
256 EXPORT_SYMBOL_GPL(stmmac_set_mac_addr);
257
258 /* Enable disable MAC RX/TX */
259 void stmmac_set_mac(void __iomem *ioaddr, bool enable)
260 {
261         u32 value = readl(ioaddr + MAC_CTRL_REG);
262
263         if (enable)
264                 value |= MAC_ENABLE_RX | MAC_ENABLE_TX;
265         else
266                 value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX);
267
268         writel(value, ioaddr + MAC_CTRL_REG);
269 }
270
271 void stmmac_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
272                          unsigned int high, unsigned int low)
273 {
274         unsigned int hi_addr, lo_addr;
275
276         /* Read the MAC address from the hardware */
277         hi_addr = readl(ioaddr + high);
278         lo_addr = readl(ioaddr + low);
279
280         /* Extract the MAC address from the high and low words */
281         addr[0] = lo_addr & 0xff;
282         addr[1] = (lo_addr >> 8) & 0xff;
283         addr[2] = (lo_addr >> 16) & 0xff;
284         addr[3] = (lo_addr >> 24) & 0xff;
285         addr[4] = hi_addr & 0xff;
286         addr[5] = (hi_addr >> 8) & 0xff;
287 }
288 EXPORT_SYMBOL_GPL(stmmac_get_mac_addr);
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