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