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