This source file includes following definitions.
- idma32_initialize_chan
- idma32_suspend_chan
- idma32_resume_chan
- idma32_bytes2block
- idma32_block2bytes
- idma32_prepare_ctllo
- idma32_encode_maxburst
- idma32_set_device_name
- idma32_fifo_partition
- idma32_disable
- idma32_enable
- idma32_dma_probe
- idma32_dma_remove
1
2
3
4 #include <linux/bitops.h>
5 #include <linux/dmaengine.h>
6 #include <linux/errno.h>
7 #include <linux/slab.h>
8 #include <linux/types.h>
9
10 #include "internal.h"
11
12 static void idma32_initialize_chan(struct dw_dma_chan *dwc)
13 {
14 u32 cfghi = 0;
15 u32 cfglo = 0;
16
17
18 cfglo |= IDMA32C_CFGL_DST_BURST_ALIGN | IDMA32C_CFGL_SRC_BURST_ALIGN;
19
20
21 cfghi |= IDMA32C_CFGH_DST_PER(dwc->dws.dst_id & 0xf);
22 cfghi |= IDMA32C_CFGH_SRC_PER(dwc->dws.src_id & 0xf);
23
24
25 cfghi |= IDMA32C_CFGH_DST_PER_EXT(dwc->dws.dst_id >> 4 & 0x3);
26 cfghi |= IDMA32C_CFGH_SRC_PER_EXT(dwc->dws.src_id >> 4 & 0x3);
27
28 channel_writel(dwc, CFG_LO, cfglo);
29 channel_writel(dwc, CFG_HI, cfghi);
30 }
31
32 static void idma32_suspend_chan(struct dw_dma_chan *dwc, bool drain)
33 {
34 u32 cfglo = channel_readl(dwc, CFG_LO);
35
36 if (drain)
37 cfglo |= IDMA32C_CFGL_CH_DRAIN;
38
39 channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
40 }
41
42 static void idma32_resume_chan(struct dw_dma_chan *dwc, bool drain)
43 {
44 u32 cfglo = channel_readl(dwc, CFG_LO);
45
46 if (drain)
47 cfglo &= ~IDMA32C_CFGL_CH_DRAIN;
48
49 channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
50 }
51
52 static u32 idma32_bytes2block(struct dw_dma_chan *dwc,
53 size_t bytes, unsigned int width, size_t *len)
54 {
55 u32 block;
56
57 if (bytes > dwc->block_size) {
58 block = dwc->block_size;
59 *len = dwc->block_size;
60 } else {
61 block = bytes;
62 *len = bytes;
63 }
64
65 return block;
66 }
67
68 static size_t idma32_block2bytes(struct dw_dma_chan *dwc, u32 block, u32 width)
69 {
70 return IDMA32C_CTLH_BLOCK_TS(block);
71 }
72
73 static u32 idma32_prepare_ctllo(struct dw_dma_chan *dwc)
74 {
75 struct dma_slave_config *sconfig = &dwc->dma_sconfig;
76 bool is_slave = is_slave_direction(dwc->direction);
77 u8 smsize = is_slave ? sconfig->src_maxburst : IDMA32_MSIZE_8;
78 u8 dmsize = is_slave ? sconfig->dst_maxburst : IDMA32_MSIZE_8;
79
80 return DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN |
81 DWC_CTLL_DST_MSIZE(dmsize) | DWC_CTLL_SRC_MSIZE(smsize);
82 }
83
84 static void idma32_encode_maxburst(struct dw_dma_chan *dwc, u32 *maxburst)
85 {
86 *maxburst = *maxburst > 1 ? fls(*maxburst) - 1 : 0;
87 }
88
89 static void idma32_set_device_name(struct dw_dma *dw, int id)
90 {
91 snprintf(dw->name, sizeof(dw->name), "idma32:dmac%d", id);
92 }
93
94
95
96
97
98
99
100 static void idma32_fifo_partition(struct dw_dma *dw)
101 {
102 u64 value = IDMA32C_FP_PSIZE_CH0(64) | IDMA32C_FP_PSIZE_CH1(64) |
103 IDMA32C_FP_UPDATE;
104 u64 fifo_partition = 0;
105
106
107 fifo_partition |= value << 0;
108
109
110 fifo_partition |= value << 32;
111
112
113 idma32_writeq(dw, FIFO_PARTITION1, fifo_partition);
114 idma32_writeq(dw, FIFO_PARTITION0, fifo_partition);
115 }
116
117 static void idma32_disable(struct dw_dma *dw)
118 {
119 do_dw_dma_off(dw);
120 idma32_fifo_partition(dw);
121 }
122
123 static void idma32_enable(struct dw_dma *dw)
124 {
125 idma32_fifo_partition(dw);
126 do_dw_dma_on(dw);
127 }
128
129 int idma32_dma_probe(struct dw_dma_chip *chip)
130 {
131 struct dw_dma *dw;
132
133 dw = devm_kzalloc(chip->dev, sizeof(*dw), GFP_KERNEL);
134 if (!dw)
135 return -ENOMEM;
136
137
138 dw->initialize_chan = idma32_initialize_chan;
139 dw->suspend_chan = idma32_suspend_chan;
140 dw->resume_chan = idma32_resume_chan;
141 dw->prepare_ctllo = idma32_prepare_ctllo;
142 dw->encode_maxburst = idma32_encode_maxburst;
143 dw->bytes2block = idma32_bytes2block;
144 dw->block2bytes = idma32_block2bytes;
145
146
147 dw->set_device_name = idma32_set_device_name;
148 dw->disable = idma32_disable;
149 dw->enable = idma32_enable;
150
151 chip->dw = dw;
152 return do_dma_probe(chip);
153 }
154 EXPORT_SYMBOL_GPL(idma32_dma_probe);
155
156 int idma32_dma_remove(struct dw_dma_chip *chip)
157 {
158 return do_dma_remove(chip);
159 }
160 EXPORT_SYMBOL_GPL(idma32_dma_remove);