1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007-2015 STMicroelectronics Ltd
4 *
5 * Author: Alexandre Torgue <alexandre.torgue@st.com>
6 */
7
8#include <linux/io.h>
9#include <linux/iopoll.h>
10#include <linux/delay.h>
11#include "common.h"
12#include "dwmac4_dma.h"
13#include "dwmac4.h"
14#include "stmmac.h"
15
16int dwmac4_dma_reset(void __iomem *ioaddr)
17{
18 u32 value = readl(addr: ioaddr + DMA_BUS_MODE);
19
20 /* DMA SW reset */
21 value |= DMA_BUS_MODE_SFT_RESET;
22 writel(val: value, addr: ioaddr + DMA_BUS_MODE);
23
24 return readl_poll_timeout(ioaddr + DMA_BUS_MODE, value,
25 !(value & DMA_BUS_MODE_SFT_RESET),
26 10000, 1000000);
27}
28
29void dwmac4_set_rx_tail_ptr(struct stmmac_priv *priv, void __iomem *ioaddr,
30 u32 tail_ptr, u32 chan)
31{
32 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
33
34 writel(val: tail_ptr, addr: ioaddr + DMA_CHAN_RX_END_ADDR(dwmac4_addrs, chan));
35}
36
37void dwmac4_set_tx_tail_ptr(struct stmmac_priv *priv, void __iomem *ioaddr,
38 u32 tail_ptr, u32 chan)
39{
40 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
41
42 writel(val: tail_ptr, addr: ioaddr + DMA_CHAN_TX_END_ADDR(dwmac4_addrs, chan));
43}
44
45void dwmac4_dma_start_tx(struct stmmac_priv *priv, void __iomem *ioaddr,
46 u32 chan)
47{
48 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
49 u32 value = readl(addr: ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));
50
51 value |= DMA_CONTROL_ST;
52 writel(val: value, addr: ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));
53
54 value = readl(addr: ioaddr + GMAC_CONFIG);
55 value |= GMAC_CONFIG_TE;
56 writel(val: value, addr: ioaddr + GMAC_CONFIG);
57}
58
59void dwmac4_dma_stop_tx(struct stmmac_priv *priv, void __iomem *ioaddr,
60 u32 chan)
61{
62 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
63
64 u32 value = readl(addr: ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));
65
66 value &= ~DMA_CONTROL_ST;
67 writel(val: value, addr: ioaddr + DMA_CHAN_TX_CONTROL(dwmac4_addrs, chan));
68}
69
70void dwmac4_dma_start_rx(struct stmmac_priv *priv, void __iomem *ioaddr,
71 u32 chan)
72{
73 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
74
75 u32 value = readl(addr: ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));
76
77 value |= DMA_CONTROL_SR;
78
79 writel(val: value, addr: ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));
80
81 value = readl(addr: ioaddr + GMAC_CONFIG);
82 value |= GMAC_CONFIG_RE;
83 writel(val: value, addr: ioaddr + GMAC_CONFIG);
84}
85
86void dwmac4_dma_stop_rx(struct stmmac_priv *priv, void __iomem *ioaddr,
87 u32 chan)
88{
89 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
90 u32 value = readl(addr: ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));
91
92 value &= ~DMA_CONTROL_SR;
93 writel(val: value, addr: ioaddr + DMA_CHAN_RX_CONTROL(dwmac4_addrs, chan));
94}
95
96void dwmac4_set_tx_ring_len(struct stmmac_priv *priv, void __iomem *ioaddr,
97 u32 len, u32 chan)
98{
99 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
100
101 writel(val: len, addr: ioaddr + DMA_CHAN_TX_RING_LEN(dwmac4_addrs, chan));
102}
103
104void dwmac4_set_rx_ring_len(struct stmmac_priv *priv, void __iomem *ioaddr,
105 u32 len, u32 chan)
106{
107 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
108
109 writel(val: len, addr: ioaddr + DMA_CHAN_RX_RING_LEN(dwmac4_addrs, chan));
110}
111
112void dwmac4_enable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
113 u32 chan, bool rx, bool tx)
114{
115 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
116 u32 value = readl(addr: ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
117
118 if (rx)
119 value |= DMA_CHAN_INTR_DEFAULT_RX;
120 if (tx)
121 value |= DMA_CHAN_INTR_DEFAULT_TX;
122
123 writel(val: value, addr: ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
124}
125
126void dwmac410_enable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
127 u32 chan, bool rx, bool tx)
128{
129 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
130 u32 value = readl(addr: ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
131
132 if (rx)
133 value |= DMA_CHAN_INTR_DEFAULT_RX_4_10;
134 if (tx)
135 value |= DMA_CHAN_INTR_DEFAULT_TX_4_10;
136
137 writel(val: value, addr: ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
138}
139
140void dwmac4_disable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
141 u32 chan, bool rx, bool tx)
142{
143 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
144 u32 value = readl(addr: ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
145
146 if (rx)
147 value &= ~DMA_CHAN_INTR_DEFAULT_RX;
148 if (tx)
149 value &= ~DMA_CHAN_INTR_DEFAULT_TX;
150
151 writel(val: value, addr: ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
152}
153
154void dwmac410_disable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
155 u32 chan, bool rx, bool tx)
156{
157 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
158 u32 value = readl(addr: ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
159
160 if (rx)
161 value &= ~DMA_CHAN_INTR_DEFAULT_RX_4_10;
162 if (tx)
163 value &= ~DMA_CHAN_INTR_DEFAULT_TX_4_10;
164
165 writel(val: value, addr: ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
166}
167
168int dwmac4_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr,
169 struct stmmac_extra_stats *x, u32 chan, u32 dir)
170{
171 const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs;
172 u32 intr_status = readl(addr: ioaddr + DMA_CHAN_STATUS(dwmac4_addrs, chan));
173 u32 intr_en = readl(addr: ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan));
174 struct stmmac_pcpu_stats *stats = this_cpu_ptr(priv->xstats.pcpu_stats);
175 int ret = 0;
176
177 if (dir == DMA_DIR_RX)
178 intr_status &= DMA_CHAN_STATUS_MSK_RX;
179 else if (dir == DMA_DIR_TX)
180 intr_status &= DMA_CHAN_STATUS_MSK_TX;
181
182 /* ABNORMAL interrupts */
183 if (unlikely(intr_status & DMA_CHAN_STATUS_AIS)) {
184 if (unlikely(intr_status & DMA_CHAN_STATUS_RBU))
185 x->rx_buf_unav_irq++;
186 if (unlikely(intr_status & DMA_CHAN_STATUS_RPS))
187 x->rx_process_stopped_irq++;
188 if (unlikely(intr_status & DMA_CHAN_STATUS_RWT))
189 x->rx_watchdog_irq++;
190 if (unlikely(intr_status & DMA_CHAN_STATUS_ETI))
191 x->tx_early_irq++;
192 if (unlikely(intr_status & DMA_CHAN_STATUS_TPS)) {
193 x->tx_process_stopped_irq++;
194 ret = tx_hard_error;
195 }
196 if (unlikely(intr_status & DMA_CHAN_STATUS_FBE)) {
197 x->fatal_bus_error_irq++;
198 ret = tx_hard_error;
199 }
200 }
201 /* TX/RX NORMAL interrupts */
202 if (likely(intr_status & DMA_CHAN_STATUS_RI)) {
203 u64_stats_update_begin(syncp: &stats->syncp);
204 u64_stats_inc(p: &stats->rx_normal_irq_n[chan]);
205 u64_stats_update_end(syncp: &stats->syncp);
206 ret |= handle_rx;
207 }
208 if (likely(intr_status & DMA_CHAN_STATUS_TI)) {
209 u64_stats_update_begin(syncp: &stats->syncp);
210 u64_stats_inc(p: &stats->tx_normal_irq_n[chan]);
211 u64_stats_update_end(syncp: &stats->syncp);
212 ret |= handle_tx;
213 }
214
215 if (unlikely(intr_status & DMA_CHAN_STATUS_TBU))
216 ret |= handle_tx;
217 if (unlikely(intr_status & DMA_CHAN_STATUS_ERI))
218 x->rx_early_irq++;
219
220 writel(val: intr_status & intr_en,
221 addr: ioaddr + DMA_CHAN_STATUS(dwmac4_addrs, chan));
222 return ret;
223}
224
225void stmmac_dwmac4_set_mac_addr(void __iomem *ioaddr, const u8 addr[6],
226 unsigned int high, unsigned int low)
227{
228 unsigned long data;
229
230 data = (addr[5] << 8) | addr[4];
231 /* For MAC Addr registers se have to set the Address Enable (AE)
232 * bit that has no effect on the High Reg 0 where the bit 31 (MO)
233 * is RO.
234 */
235 data |= (STMMAC_CHAN0 << GMAC_HI_DCS_SHIFT);
236 writel(val: data | GMAC_HI_REG_AE, addr: ioaddr + high);
237 data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
238 writel(val: data, addr: ioaddr + low);
239}
240
241/* Enable disable MAC RX/TX */
242void stmmac_dwmac4_set_mac(void __iomem *ioaddr, bool enable)
243{
244 u32 value = readl(addr: ioaddr + GMAC_CONFIG);
245 u32 old_val = value;
246
247 if (enable)
248 value |= GMAC_CONFIG_RE | GMAC_CONFIG_TE;
249 else
250 value &= ~(GMAC_CONFIG_TE | GMAC_CONFIG_RE);
251
252 if (value != old_val)
253 writel(val: value, addr: ioaddr + GMAC_CONFIG);
254}
255
256void stmmac_dwmac4_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
257 unsigned int high, unsigned int low)
258{
259 unsigned int hi_addr, lo_addr;
260
261 /* Read the MAC address from the hardware */
262 hi_addr = readl(addr: ioaddr + high);
263 lo_addr = readl(addr: ioaddr + low);
264
265 /* Extract the MAC address from the high and low words */
266 addr[0] = lo_addr & 0xff;
267 addr[1] = (lo_addr >> 8) & 0xff;
268 addr[2] = (lo_addr >> 16) & 0xff;
269 addr[3] = (lo_addr >> 24) & 0xff;
270 addr[4] = hi_addr & 0xff;
271 addr[5] = (hi_addr >> 8) & 0xff;
272}
273

source code of linux/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c