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
flexcop_dma_allocate(struct pci_dev * pdev,struct flexcop_dma * dma,u32 size)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 = pci_alloc_consistent(pdev, size, &tdma);
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
flexcop_dma_free(struct flexcop_dma * dma)34 void flexcop_dma_free(struct flexcop_dma *dma)
35 {
36 pci_free_consistent(dma->pdev, dma->size*2,
37 dma->cpu_addr0, dma->dma_addr0);
38 memset(dma, 0, sizeof(struct flexcop_dma));
39 }
40 EXPORT_SYMBOL(flexcop_dma_free);
41
flexcop_dma_config(struct flexcop_device * fc,struct flexcop_dma * dma,flexcop_dma_index_t dma_idx)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 */
flexcop_dma_xfer_control(struct flexcop_device * fc,flexcop_dma_index_t dma_idx,flexcop_dma_addr_index_t index,int onoff)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
flexcop_dma_remap(struct flexcop_device * fc,flexcop_dma_index_t dma_idx,int onoff)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
flexcop_dma_control_size_irq(struct flexcop_device * fc,flexcop_dma_index_t no,int onoff)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
flexcop_dma_control_timer_irq(struct flexcop_device * fc,flexcop_dma_index_t no,int onoff)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 */
flexcop_dma_config_timer(struct flexcop_device * fc,flexcop_dma_index_t dma_idx,u8 cycles)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