1// SPDX-License-Identifier: GPL-2.0-only
2/*******************************************************************************
3 This is the driver for the MAC 10/100 on-chip Ethernet controller
4 currently tested on all the ST boards based on STb7109 and stx7200 SoCs.
5
6 DWC Ether MAC 10/100 Universal version 4.0 has been used for developing
7 this code.
8
9 This contains the functions to handle the dma.
10
11 Copyright (C) 2007-2009 STMicroelectronics Ltd
12
13
14 Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
15*******************************************************************************/
16
17#include <asm/io.h>
18#include "dwmac100.h"
19#include "dwmac_dma.h"
20
21static void dwmac100_dma_init(void __iomem *ioaddr,
22 struct stmmac_dma_cfg *dma_cfg, int atds)
23{
24 /* Enable Application Access by writing to DMA CSR0 */
25 writel(DMA_BUS_MODE_DEFAULT | (dma_cfg->pbl << DMA_BUS_MODE_PBL_SHIFT),
26 addr: ioaddr + DMA_BUS_MODE);
27
28 /* Mask interrupts by writing to CSR7 */
29 writel(DMA_INTR_DEFAULT_MASK, addr: ioaddr + DMA_INTR_ENA);
30}
31
32static void dwmac100_dma_init_rx(struct stmmac_priv *priv, void __iomem *ioaddr,
33 struct stmmac_dma_cfg *dma_cfg,
34 dma_addr_t dma_rx_phy, u32 chan)
35{
36 /* RX descriptor base addr lists must be written into DMA CSR3 */
37 writel(lower_32_bits(dma_rx_phy), addr: ioaddr + DMA_RCV_BASE_ADDR);
38}
39
40static void dwmac100_dma_init_tx(struct stmmac_priv *priv, void __iomem *ioaddr,
41 struct stmmac_dma_cfg *dma_cfg,
42 dma_addr_t dma_tx_phy, u32 chan)
43{
44 /* TX descriptor base addr lists must be written into DMA CSR4 */
45 writel(lower_32_bits(dma_tx_phy), addr: ioaddr + DMA_TX_BASE_ADDR);
46}
47
48/* Store and Forward capability is not used at all.
49 *
50 * The transmit threshold can be programmed by setting the TTC bits in the DMA
51 * control register.
52 */
53static void dwmac100_dma_operation_mode_tx(struct stmmac_priv *priv,
54 void __iomem *ioaddr, int mode,
55 u32 channel, int fifosz, u8 qmode)
56{
57 u32 csr6 = readl(addr: ioaddr + DMA_CONTROL);
58
59 if (mode <= 32)
60 csr6 |= DMA_CONTROL_TTC_32;
61 else if (mode <= 64)
62 csr6 |= DMA_CONTROL_TTC_64;
63 else
64 csr6 |= DMA_CONTROL_TTC_128;
65
66 writel(val: csr6, addr: ioaddr + DMA_CONTROL);
67}
68
69static void dwmac100_dump_dma_regs(struct stmmac_priv *priv,
70 void __iomem *ioaddr, u32 *reg_space)
71{
72 int i;
73
74 for (i = 0; i < NUM_DWMAC100_DMA_REGS; i++)
75 reg_space[DMA_BUS_MODE / 4 + i] =
76 readl(addr: ioaddr + DMA_BUS_MODE + i * 4);
77
78 reg_space[DMA_CUR_TX_BUF_ADDR / 4] =
79 readl(addr: ioaddr + DMA_CUR_TX_BUF_ADDR);
80 reg_space[DMA_CUR_RX_BUF_ADDR / 4] =
81 readl(addr: ioaddr + DMA_CUR_RX_BUF_ADDR);
82}
83
84/* DMA controller has two counters to track the number of the missed frames. */
85static void dwmac100_dma_diagnostic_fr(struct stmmac_extra_stats *x,
86 void __iomem *ioaddr)
87{
88 u32 csr8 = readl(addr: ioaddr + DMA_MISSED_FRAME_CTR);
89
90 if (unlikely(csr8)) {
91 if (csr8 & DMA_MISSED_FRAME_OVE) {
92 x->rx_overflow_cntr += 0x800;
93 } else {
94 unsigned int ove_cntr;
95 ove_cntr = ((csr8 & DMA_MISSED_FRAME_OVE_CNTR) >> 17);
96 x->rx_overflow_cntr += ove_cntr;
97 }
98
99 if (csr8 & DMA_MISSED_FRAME_OVE_M) {
100 x->rx_missed_cntr += 0xffff;
101 } else {
102 unsigned int miss_f = (csr8 & DMA_MISSED_FRAME_M_CNTR);
103 x->rx_missed_cntr += miss_f;
104 }
105 }
106}
107
108const struct stmmac_dma_ops dwmac100_dma_ops = {
109 .reset = dwmac_dma_reset,
110 .init = dwmac100_dma_init,
111 .init_rx_chan = dwmac100_dma_init_rx,
112 .init_tx_chan = dwmac100_dma_init_tx,
113 .dump_regs = dwmac100_dump_dma_regs,
114 .dma_tx_mode = dwmac100_dma_operation_mode_tx,
115 .dma_diagnostic_fr = dwmac100_dma_diagnostic_fr,
116 .enable_dma_transmission = dwmac_enable_dma_transmission,
117 .enable_dma_irq = dwmac_enable_dma_irq,
118 .disable_dma_irq = dwmac_disable_dma_irq,
119 .start_tx = dwmac_dma_start_tx,
120 .stop_tx = dwmac_dma_stop_tx,
121 .start_rx = dwmac_dma_start_rx,
122 .stop_rx = dwmac_dma_stop_rx,
123 .dma_interrupt = dwmac_dma_interrupt,
124};
125

source code of linux/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c