pci/pt3/pt3_dma.c

24 int pt3_stop_dma(struct pt3_adapter *adap)
26 	struct pt3_board *pt3 = adap->dvb_adap.priv;
31 	base = get_dma_base(adap->adap_idx);
46 int pt3_start_dma(struct pt3_adapter *adap)
48 	struct pt3_board *pt3 = adap->dvb_adap.priv;
49 	u32 base = get_dma_base(adap->adap_idx);
52 	iowrite32(lower_32_bits(adap->desc_buf[0].b_addr),
54 	iowrite32(upper_32_bits(adap->desc_buf[0].b_addr),
61 static u8 *next_unit(struct pt3_adapter *adap, int *idx, int *ofs)
67 		if (*idx == adap->num_bufs)
70 	return &adap->buffer[*idx].data[*ofs];
73 int pt3_proc_dma(struct pt3_adapter *adap)
77 	idx = adap->buf_idx;
78 	ofs = adap->buf_ofs;
80 	if (adap->buffer[idx].data[ofs] == PT3_BUF_CANARY)
83 	while (*next_unit(adap, &idx, &ofs) != PT3_BUF_CANARY) {
86 		p = &adap->buffer[adap->buf_idx].data[adap->buf_ofs];
87 		if (adap->num_discard > 0)
88 			adap->num_discard--;
89 		else if (adap->buf_ofs + PT3_ACCESS_UNIT > DATA_BUF_SZ) {
90 			dvb_dmx_swfilter_packets(&adap->demux, p,
91 				(DATA_BUF_SZ - adap->buf_ofs) / TS_PACKET_SZ);
92 			dvb_dmx_swfilter_packets(&adap->demux,
93 				adap->buffer[idx].data, ofs / TS_PACKET_SZ);
95 			dvb_dmx_swfilter_packets(&adap->demux, p,
99 		adap->buf_idx = idx;
100 		adap->buf_ofs = ofs;
105 void pt3_init_dmabuf(struct pt3_adapter *adap)
112 	p = adap->buffer[0].data;
114 	while (idx < adap->num_bufs) {
120 			p = adap->buffer[idx].data;
123 	adap->buf_idx = 0;
124 	adap->buf_ofs = 0;
127 void pt3_free_dmabuf(struct pt3_adapter *adap)
132 	pt3 = adap->dvb_adap.priv;
133 	for (i = 0; i < adap->num_bufs; i++)
135 			adap->buffer[i].data, adap->buffer[i].b_addr);
136 	adap->num_bufs = 0;
138 	for (i = 0; i < adap->num_desc_bufs; i++)
140 			adap->desc_buf[i].descs, adap->desc_buf[i].b_addr);
141 	adap->num_desc_bufs = 0;
145 int pt3_alloc_dmabuf(struct pt3_adapter *adap)
155 	pt3 = adap->dvb_adap.priv;
156 	adap->num_bufs = 0;
157 	adap->num_desc_bufs = 0;
160 					&adap->buffer[i].b_addr, GFP_KERNEL);
163 		adap->buffer[i].data = p;
164 		adap->num_bufs++;
166 	pt3_init_dmabuf(adap);
172 		DIV_ROUND_UP(adap->num_bufs * DATA_BUF_XFERS, DESCS_IN_PAGE);
178 		adap->num_desc_bufs++;
179 		adap->desc_buf[i].descs = p;
180 		adap->desc_buf[i].b_addr = desc_addr;
183 			d = &adap->desc_buf[i - 1].descs[DESCS_IN_PAGE - 1];
188 			data_addr = adap->buffer[idx].b_addr + ofs;
189 			d = &adap->desc_buf[i].descs[j];
202 				if (idx >= adap->num_bufs) {
203 					desc_addr = adap->desc_buf[0].b_addr;
214 	pt3_free_dmabuf(adap);