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
8int 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}
30EXPORT_SYMBOL(flexcop_dma_allocate);
31
32void 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}
38EXPORT_SYMBOL(flexcop_dma_free);
39
40int 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}
67EXPORT_SYMBOL(flexcop_dma_config);
68
69/* start the DMA transfers, but not the DMA IRQs */
70int 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}
109EXPORT_SYMBOL(flexcop_dma_xfer_control);
110
111static 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
123int 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}
138EXPORT_SYMBOL(flexcop_dma_control_size_irq);
139
140int 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}
155EXPORT_SYMBOL(flexcop_dma_control_timer_irq);
156
157/* 1 cycles = 1.97 msec */
158int 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}
171EXPORT_SYMBOL(flexcop_dma_config_timer);
172
173