1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III |
4 | * flexcop-dma.c - configuring and controlling the DMA of the FlexCop |
5 | * see flexcop.c for copyright information |
6 | */ |
7 | #include "flexcop.h" |
8 | |
9 | int flexcop_dma_allocate(struct pci_dev *pdev, |
10 | struct flexcop_dma *dma, u32 size) |
11 | { |
12 | u8 *tcpu; |
13 | dma_addr_t tdma = 0; |
14 | |
15 | if (size % 2) { |
16 | err("dma buffersize has to be even." ); |
17 | return -EINVAL; |
18 | } |
19 | |
20 | tcpu = dma_alloc_coherent(&pdev->dev, size, &tdma, GFP_KERNEL); |
21 | if (tcpu != NULL) { |
22 | dma->pdev = pdev; |
23 | dma->cpu_addr0 = tcpu; |
24 | dma->dma_addr0 = tdma; |
25 | dma->cpu_addr1 = tcpu + size/2; |
26 | dma->dma_addr1 = tdma + size/2; |
27 | dma->size = size/2; |
28 | return 0; |
29 | } |
30 | return -ENOMEM; |
31 | } |
32 | EXPORT_SYMBOL(flexcop_dma_allocate); |
33 | |
34 | void flexcop_dma_free(struct flexcop_dma *dma) |
35 | { |
36 | dma_free_coherent(&dma->pdev->dev, dma->size * 2, dma->cpu_addr0, |
37 | dma->dma_addr0); |
38 | memset(dma, 0, sizeof(struct flexcop_dma)); |
39 | } |
40 | EXPORT_SYMBOL(flexcop_dma_free); |
41 | |
42 | int flexcop_dma_config(struct flexcop_device *fc, |
43 | struct flexcop_dma *dma, |
44 | flexcop_dma_index_t dma_idx) |
45 | { |
46 | flexcop_ibi_value v0x0, v0x4, v0xc; |
47 | |
48 | v0x0.raw = v0x4.raw = v0xc.raw = 0; |
49 | v0x0.dma_0x0.dma_address0 = dma->dma_addr0 >> 2; |
50 | v0xc.dma_0xc.dma_address1 = dma->dma_addr1 >> 2; |
51 | v0x4.dma_0x4_write.dma_addr_size = dma->size / 4; |
52 | |
53 | if ((dma_idx & FC_DMA_1) == dma_idx) { |
54 | fc->write_ibi_reg(fc, dma1_000, v0x0); |
55 | fc->write_ibi_reg(fc, dma1_004, v0x4); |
56 | fc->write_ibi_reg(fc, dma1_00c, v0xc); |
57 | } else if ((dma_idx & FC_DMA_2) == dma_idx) { |
58 | fc->write_ibi_reg(fc, dma2_010, v0x0); |
59 | fc->write_ibi_reg(fc, dma2_014, v0x4); |
60 | fc->write_ibi_reg(fc, dma2_01c, v0xc); |
61 | } else { |
62 | err("either DMA1 or DMA2 can be configured within one %s call." , |
63 | __func__); |
64 | return -EINVAL; |
65 | } |
66 | |
67 | return 0; |
68 | } |
69 | EXPORT_SYMBOL(flexcop_dma_config); |
70 | |
71 | /* start the DMA transfers, but not the DMA IRQs */ |
72 | int flexcop_dma_xfer_control(struct flexcop_device *fc, |
73 | flexcop_dma_index_t dma_idx, |
74 | flexcop_dma_addr_index_t index, |
75 | int onoff) |
76 | { |
77 | flexcop_ibi_value v0x0, v0xc; |
78 | flexcop_ibi_register r0x0, r0xc; |
79 | |
80 | if ((dma_idx & FC_DMA_1) == dma_idx) { |
81 | r0x0 = dma1_000; |
82 | r0xc = dma1_00c; |
83 | } else if ((dma_idx & FC_DMA_2) == dma_idx) { |
84 | r0x0 = dma2_010; |
85 | r0xc = dma2_01c; |
86 | } else { |
87 | err("transfer DMA1 or DMA2 can be started within one %s call." , |
88 | __func__); |
89 | return -EINVAL; |
90 | } |
91 | |
92 | v0x0 = fc->read_ibi_reg(fc, r0x0); |
93 | v0xc = fc->read_ibi_reg(fc, r0xc); |
94 | |
95 | deb_rdump("reg: %03x: %x\n" , r0x0, v0x0.raw); |
96 | deb_rdump("reg: %03x: %x\n" , r0xc, v0xc.raw); |
97 | |
98 | if (index & FC_DMA_SUBADDR_0) |
99 | v0x0.dma_0x0.dma_0start = onoff; |
100 | |
101 | if (index & FC_DMA_SUBADDR_1) |
102 | v0xc.dma_0xc.dma_1start = onoff; |
103 | |
104 | fc->write_ibi_reg(fc, r0x0, v0x0); |
105 | fc->write_ibi_reg(fc, r0xc, v0xc); |
106 | |
107 | deb_rdump("reg: %03x: %x\n" , r0x0, v0x0.raw); |
108 | deb_rdump("reg: %03x: %x\n" , r0xc, v0xc.raw); |
109 | return 0; |
110 | } |
111 | EXPORT_SYMBOL(flexcop_dma_xfer_control); |
112 | |
113 | static int flexcop_dma_remap(struct flexcop_device *fc, |
114 | flexcop_dma_index_t dma_idx, |
115 | int onoff) |
116 | { |
117 | flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_00c : dma2_01c; |
118 | flexcop_ibi_value v = fc->read_ibi_reg(fc, r); |
119 | |
120 | deb_info("%s\n" , __func__); |
121 | v.dma_0xc.remap_enable = onoff; |
122 | fc->write_ibi_reg(fc, r, v); |
123 | return 0; |
124 | } |
125 | |
126 | int flexcop_dma_control_size_irq(struct flexcop_device *fc, |
127 | flexcop_dma_index_t no, |
128 | int onoff) |
129 | { |
130 | flexcop_ibi_value v = fc->read_ibi_reg(fc, ctrl_208); |
131 | |
132 | if (no & FC_DMA_1) |
133 | v.ctrl_208.DMA1_IRQ_Enable_sig = onoff; |
134 | |
135 | if (no & FC_DMA_2) |
136 | v.ctrl_208.DMA2_IRQ_Enable_sig = onoff; |
137 | |
138 | fc->write_ibi_reg(fc, ctrl_208, v); |
139 | return 0; |
140 | } |
141 | EXPORT_SYMBOL(flexcop_dma_control_size_irq); |
142 | |
143 | int flexcop_dma_control_timer_irq(struct flexcop_device *fc, |
144 | flexcop_dma_index_t no, |
145 | int onoff) |
146 | { |
147 | flexcop_ibi_value v = fc->read_ibi_reg(fc, ctrl_208); |
148 | |
149 | if (no & FC_DMA_1) |
150 | v.ctrl_208.DMA1_Timer_Enable_sig = onoff; |
151 | |
152 | if (no & FC_DMA_2) |
153 | v.ctrl_208.DMA2_Timer_Enable_sig = onoff; |
154 | |
155 | fc->write_ibi_reg(fc, ctrl_208, v); |
156 | return 0; |
157 | } |
158 | EXPORT_SYMBOL(flexcop_dma_control_timer_irq); |
159 | |
160 | /* 1 cycles = 1.97 msec */ |
161 | int flexcop_dma_config_timer(struct flexcop_device *fc, |
162 | flexcop_dma_index_t dma_idx, u8 cycles) |
163 | { |
164 | flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_004 : dma2_014; |
165 | flexcop_ibi_value v = fc->read_ibi_reg(fc, r); |
166 | |
167 | flexcop_dma_remap(fc, dma_idx, 0); |
168 | |
169 | deb_info("%s\n" , __func__); |
170 | v.dma_0x4_write.dmatimer = cycles; |
171 | fc->write_ibi_reg(fc, r, v); |
172 | return 0; |
173 | } |
174 | EXPORT_SYMBOL(flexcop_dma_config_timer); |
175 | |
176 | |