Linux Kernel  3.7.1
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flexcop-dma.c
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1 /*
2  * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
3  * flexcop-dma.c - configuring and controlling the DMA of the FlexCop
4  * see flexcop.c for copyright information
5  */
6 #include "flexcop.h"
7 
8 int flexcop_dma_allocate(struct pci_dev *pdev,
9  struct flexcop_dma *dma, u32 size)
10 {
11  u8 *tcpu;
12  dma_addr_t tdma = 0;
13 
14  if (size % 2) {
15  err("dma buffersize has to be even.");
16  return -EINVAL;
17  }
18 
19  if ((tcpu = pci_alloc_consistent(pdev, size, &tdma)) != NULL) {
20  dma->pdev = pdev;
21  dma->cpu_addr0 = tcpu;
22  dma->dma_addr0 = tdma;
23  dma->cpu_addr1 = tcpu + size/2;
24  dma->dma_addr1 = tdma + size/2;
25  dma->size = size/2;
26  return 0;
27  }
28  return -ENOMEM;
29 }
30 EXPORT_SYMBOL(flexcop_dma_allocate);
31 
32 void flexcop_dma_free(struct flexcop_dma *dma)
33 {
34  pci_free_consistent(dma->pdev, dma->size*2,
35  dma->cpu_addr0, dma->dma_addr0);
36  memset(dma,0,sizeof(struct flexcop_dma));
37 }
38 EXPORT_SYMBOL(flexcop_dma_free);
39 
40 int flexcop_dma_config(struct flexcop_device *fc,
41  struct flexcop_dma *dma,
42  flexcop_dma_index_t dma_idx)
43 {
44  flexcop_ibi_value v0x0,v0x4,v0xc;
45  v0x0.raw = v0x4.raw = v0xc.raw = 0;
46 
47  v0x0.dma_0x0.dma_address0 = dma->dma_addr0 >> 2;
48  v0xc.dma_0xc.dma_address1 = dma->dma_addr1 >> 2;
49  v0x4.dma_0x4_write.dma_addr_size = dma->size / 4;
50 
51  if ((dma_idx & FC_DMA_1) == dma_idx) {
52  fc->write_ibi_reg(fc,dma1_000,v0x0);
53  fc->write_ibi_reg(fc,dma1_004,v0x4);
54  fc->write_ibi_reg(fc,dma1_00c,v0xc);
55  } else if ((dma_idx & FC_DMA_2) == dma_idx) {
56  fc->write_ibi_reg(fc,dma2_010,v0x0);
57  fc->write_ibi_reg(fc,dma2_014,v0x4);
58  fc->write_ibi_reg(fc,dma2_01c,v0xc);
59  } else {
60  err("either DMA1 or DMA2 can be configured within one "
61  "flexcop_dma_config call.");
62  return -EINVAL;
63  }
64 
65  return 0;
66 }
67 EXPORT_SYMBOL(flexcop_dma_config);
68 
69 /* start the DMA transfers, but not the DMA IRQs */
70 int flexcop_dma_xfer_control(struct flexcop_device *fc,
71  flexcop_dma_index_t dma_idx,
72  flexcop_dma_addr_index_t index,
73  int onoff)
74 {
75  flexcop_ibi_value v0x0,v0xc;
76  flexcop_ibi_register r0x0,r0xc;
77 
78  if ((dma_idx & FC_DMA_1) == dma_idx) {
79  r0x0 = dma1_000;
80  r0xc = dma1_00c;
81  } else if ((dma_idx & FC_DMA_2) == dma_idx) {
82  r0x0 = dma2_010;
83  r0xc = dma2_01c;
84  } else {
85  err("either transfer DMA1 or DMA2 can be started within one "
86  "flexcop_dma_xfer_control call.");
87  return -EINVAL;
88  }
89 
90  v0x0 = fc->read_ibi_reg(fc,r0x0);
91  v0xc = fc->read_ibi_reg(fc,r0xc);
92 
93  deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw);
94  deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw);
95 
96  if (index & FC_DMA_SUBADDR_0)
97  v0x0.dma_0x0.dma_0start = onoff;
98 
99  if (index & FC_DMA_SUBADDR_1)
100  v0xc.dma_0xc.dma_1start = onoff;
101 
102  fc->write_ibi_reg(fc,r0x0,v0x0);
103  fc->write_ibi_reg(fc,r0xc,v0xc);
104 
105  deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw);
106  deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw);
107  return 0;
108 }
109 EXPORT_SYMBOL(flexcop_dma_xfer_control);
110 
111 static int flexcop_dma_remap(struct flexcop_device *fc,
112  flexcop_dma_index_t dma_idx,
113  int onoff)
114 {
115  flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_00c : dma2_01c;
116  flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
117  deb_info("%s\n",__func__);
118  v.dma_0xc.remap_enable = onoff;
119  fc->write_ibi_reg(fc,r,v);
120  return 0;
121 }
122 
123 int flexcop_dma_control_size_irq(struct flexcop_device *fc,
124  flexcop_dma_index_t no,
125  int onoff)
126 {
127  flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
128 
129  if (no & FC_DMA_1)
130  v.ctrl_208.DMA1_IRQ_Enable_sig = onoff;
131 
132  if (no & FC_DMA_2)
133  v.ctrl_208.DMA2_IRQ_Enable_sig = onoff;
134 
135  fc->write_ibi_reg(fc,ctrl_208,v);
136  return 0;
137 }
138 EXPORT_SYMBOL(flexcop_dma_control_size_irq);
139 
140 int flexcop_dma_control_timer_irq(struct flexcop_device *fc,
141  flexcop_dma_index_t no,
142  int onoff)
143 {
144  flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
145 
146  if (no & FC_DMA_1)
147  v.ctrl_208.DMA1_Timer_Enable_sig = onoff;
148 
149  if (no & FC_DMA_2)
150  v.ctrl_208.DMA2_Timer_Enable_sig = onoff;
151 
152  fc->write_ibi_reg(fc,ctrl_208,v);
153  return 0;
154 }
155 EXPORT_SYMBOL(flexcop_dma_control_timer_irq);
156 
157 /* 1 cycles = 1.97 msec */
158 int flexcop_dma_config_timer(struct flexcop_device *fc,
159  flexcop_dma_index_t dma_idx, u8 cycles)
160 {
161  flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_004 : dma2_014;
162  flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
163 
164  flexcop_dma_remap(fc,dma_idx,0);
165 
166  deb_info("%s\n",__func__);
167  v.dma_0x4_write.dmatimer = cycles;
168  fc->write_ibi_reg(fc,r,v);
169  return 0;
170 }
171 EXPORT_SYMBOL(flexcop_dma_config_timer);
172 
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