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47dd7a54 GC |
1 | /******************************************************************************* |
2 | This is the driver for the GMAC on-chip Ethernet controller for ST SoCs. | |
3 | DWC Ether MAC 10/100/1000 Universal version 3.41a has been used for | |
4 | developing this code. | |
5 | ||
56b106ae | 6 | This contains the functions to handle the dma. |
21d437cc | 7 | |
47dd7a54 GC |
8 | Copyright (C) 2007-2009 STMicroelectronics Ltd |
9 | ||
10 | This program is free software; you can redistribute it and/or modify it | |
11 | under the terms and conditions of the GNU General Public License, | |
12 | version 2, as published by the Free Software Foundation. | |
13 | ||
14 | This program is distributed in the hope it will be useful, but WITHOUT | |
15 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
17 | more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License along with | |
20 | this program; if not, write to the Free Software Foundation, Inc., | |
21 | 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
22 | ||
23 | The full GNU General Public License is included in this distribution in | |
24 | the file called "COPYING". | |
25 | ||
26 | Author: Giuseppe Cavallaro <peppe.cavallaro@st.com> | |
27 | *******************************************************************************/ | |
28 | ||
b7f080cf | 29 | #include <asm/io.h> |
21d437cc | 30 | #include "dwmac1000.h" |
aec7ff27 | 31 | #include "dwmac_dma.h" |
47dd7a54 | 32 | |
ad01b7d4 | 33 | static int dwmac1000_dma_init(void __iomem *ioaddr, int pbl, u32 dma_tx, |
21d437cc | 34 | u32 dma_rx) |
47dd7a54 GC |
35 | { |
36 | u32 value = readl(ioaddr + DMA_BUS_MODE); | |
c629882a GC |
37 | int limit; |
38 | ||
47dd7a54 GC |
39 | /* DMA SW reset */ |
40 | value |= DMA_BUS_MODE_SFT_RESET; | |
41 | writel(value, ioaddr + DMA_BUS_MODE); | |
bbc17546 | 42 | limit = 10; |
c629882a GC |
43 | while (limit--) { |
44 | if (!(readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET)) | |
45 | break; | |
bbc17546 | 46 | mdelay(10); |
c629882a GC |
47 | } |
48 | if (limit < 0) | |
49 | return -EBUSY; | |
47dd7a54 GC |
50 | |
51 | value = /* DMA_BUS_MODE_FB | */ DMA_BUS_MODE_4PBL | | |
52 | ((pbl << DMA_BUS_MODE_PBL_SHIFT) | | |
53 | (pbl << DMA_BUS_MODE_RPBL_SHIFT)); | |
54 | ||
55 | #ifdef CONFIG_STMMAC_DA | |
56 | value |= DMA_BUS_MODE_DA; /* Rx has priority over tx */ | |
57 | #endif | |
58 | writel(value, ioaddr + DMA_BUS_MODE); | |
59 | ||
60 | /* Mask interrupts by writing to CSR7 */ | |
61 | writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA); | |
62 | ||
63 | /* The base address of the RX/TX descriptor lists must be written into | |
64 | * DMA CSR3 and CSR4, respectively. */ | |
65 | writel(dma_tx, ioaddr + DMA_TX_BASE_ADDR); | |
66 | writel(dma_rx, ioaddr + DMA_RCV_BASE_ADDR); | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
ad01b7d4 | 71 | static void dwmac1000_dma_operation_mode(void __iomem *ioaddr, int txmode, |
47dd7a54 GC |
72 | int rxmode) |
73 | { | |
74 | u32 csr6 = readl(ioaddr + DMA_CONTROL); | |
75 | ||
76 | if (txmode == SF_DMA_MODE) { | |
56b106ae | 77 | CHIP_DBG(KERN_DEBUG "GMAC: enable TX store and forward mode\n"); |
47dd7a54 GC |
78 | /* Transmit COE type 2 cannot be done in cut-through mode. */ |
79 | csr6 |= DMA_CONTROL_TSF; | |
80 | /* Operating on second frame increase the performance | |
81 | * especially when transmit store-and-forward is used.*/ | |
82 | csr6 |= DMA_CONTROL_OSF; | |
83 | } else { | |
56b106ae | 84 | CHIP_DBG(KERN_DEBUG "GMAC: disabling TX store and forward mode" |
47dd7a54 GC |
85 | " (threshold = %d)\n", txmode); |
86 | csr6 &= ~DMA_CONTROL_TSF; | |
87 | csr6 &= DMA_CONTROL_TC_TX_MASK; | |
af901ca1 | 88 | /* Set the transmit threshold */ |
47dd7a54 GC |
89 | if (txmode <= 32) |
90 | csr6 |= DMA_CONTROL_TTC_32; | |
91 | else if (txmode <= 64) | |
92 | csr6 |= DMA_CONTROL_TTC_64; | |
93 | else if (txmode <= 128) | |
94 | csr6 |= DMA_CONTROL_TTC_128; | |
95 | else if (txmode <= 192) | |
96 | csr6 |= DMA_CONTROL_TTC_192; | |
97 | else | |
98 | csr6 |= DMA_CONTROL_TTC_256; | |
99 | } | |
100 | ||
101 | if (rxmode == SF_DMA_MODE) { | |
56b106ae | 102 | CHIP_DBG(KERN_DEBUG "GMAC: enable RX store and forward mode\n"); |
47dd7a54 GC |
103 | csr6 |= DMA_CONTROL_RSF; |
104 | } else { | |
56b106ae | 105 | CHIP_DBG(KERN_DEBUG "GMAC: disabling RX store and forward mode" |
47dd7a54 GC |
106 | " (threshold = %d)\n", rxmode); |
107 | csr6 &= ~DMA_CONTROL_RSF; | |
108 | csr6 &= DMA_CONTROL_TC_RX_MASK; | |
109 | if (rxmode <= 32) | |
110 | csr6 |= DMA_CONTROL_RTC_32; | |
111 | else if (rxmode <= 64) | |
112 | csr6 |= DMA_CONTROL_RTC_64; | |
113 | else if (rxmode <= 96) | |
114 | csr6 |= DMA_CONTROL_RTC_96; | |
115 | else | |
116 | csr6 |= DMA_CONTROL_RTC_128; | |
117 | } | |
118 | ||
119 | writel(csr6, ioaddr + DMA_CONTROL); | |
47dd7a54 GC |
120 | } |
121 | ||
ad01b7d4 | 122 | static void dwmac1000_dump_dma_regs(void __iomem *ioaddr) |
47dd7a54 GC |
123 | { |
124 | int i; | |
125 | pr_info(" DMA registers\n"); | |
126 | for (i = 0; i < 22; i++) { | |
127 | if ((i < 9) || (i > 17)) { | |
128 | int offset = i * 4; | |
129 | pr_err("\t Reg No. %d (offset 0x%x): 0x%08x\n", i, | |
130 | (DMA_BUS_MODE + offset), | |
131 | readl(ioaddr + DMA_BUS_MODE + offset)); | |
132 | } | |
133 | } | |
47dd7a54 GC |
134 | } |
135 | ||
e7434821 GC |
136 | static unsigned int dwmac1000_get_hw_feature(void __iomem *ioaddr) |
137 | { | |
138 | return readl(ioaddr + DMA_HW_FEATURE); | |
139 | } | |
140 | ||
cadb7924 | 141 | const struct stmmac_dma_ops dwmac1000_dma_ops = { |
21d437cc GC |
142 | .init = dwmac1000_dma_init, |
143 | .dump_regs = dwmac1000_dump_dma_regs, | |
144 | .dma_mode = dwmac1000_dma_operation_mode, | |
aec7ff27 GC |
145 | .enable_dma_transmission = dwmac_enable_dma_transmission, |
146 | .enable_dma_irq = dwmac_enable_dma_irq, | |
147 | .disable_dma_irq = dwmac_disable_dma_irq, | |
148 | .start_tx = dwmac_dma_start_tx, | |
149 | .stop_tx = dwmac_dma_stop_tx, | |
150 | .start_rx = dwmac_dma_start_rx, | |
151 | .stop_rx = dwmac_dma_stop_rx, | |
152 | .dma_interrupt = dwmac_dma_interrupt, | |
e7434821 | 153 | .get_hw_feature = dwmac1000_get_hw_feature, |
db98a0b0 | 154 | }; |