// SPDX-License-Identifier: GPL-2.0
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/*
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* Earthsoft PT3 driver
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*
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* Copyright (C) 2014 Akihiro Tsukada <tskd08@gmail.com>
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*/
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include "pt3.h"
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#define PT3_ACCESS_UNIT (TS_PACKET_SZ * 128)
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#define PT3_BUF_CANARY (0x74)
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static u32 get_dma_base(int idx)
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{
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int i;
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i = (idx == 1 || idx == 2) ? 3 - idx : idx;
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return REG_DMA_BASE + 0x18 * i;
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}
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int pt3_stop_dma(struct pt3_adapter *adap)
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{
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struct pt3_board *pt3 = adap->dvb_adap.priv;
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u32 base;
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u32 stat;
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int retry;
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base = get_dma_base(adap->adap_idx);
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stat = ioread32(pt3->regs[0] + base + OFST_STATUS);
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if (!(stat & 0x01))
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return 0;
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iowrite32(0x02, pt3->regs[0] + base + OFST_DMA_CTL);
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for (retry = 0; retry < 5; retry++) {
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stat = ioread32(pt3->regs[0] + base + OFST_STATUS);
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if (!(stat & 0x01))
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return 0;
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msleep(50);
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}
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return -EIO;
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}
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int pt3_start_dma(struct pt3_adapter *adap)
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{
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struct pt3_board *pt3 = adap->dvb_adap.priv;
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u32 base = get_dma_base(adap->adap_idx);
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iowrite32(0x02, pt3->regs[0] + base + OFST_DMA_CTL);
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iowrite32(lower_32_bits(adap->desc_buf[0].b_addr),
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pt3->regs[0] + base + OFST_DMA_DESC_L);
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iowrite32(upper_32_bits(adap->desc_buf[0].b_addr),
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pt3->regs[0] + base + OFST_DMA_DESC_H);
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iowrite32(0x01, pt3->regs[0] + base + OFST_DMA_CTL);
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return 0;
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}
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static u8 *next_unit(struct pt3_adapter *adap, int *idx, int *ofs)
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{
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*ofs += PT3_ACCESS_UNIT;
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if (*ofs >= DATA_BUF_SZ) {
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*ofs -= DATA_BUF_SZ;
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(*idx)++;
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if (*idx == adap->num_bufs)
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*idx = 0;
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}
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return &adap->buffer[*idx].data[*ofs];
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}
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int pt3_proc_dma(struct pt3_adapter *adap)
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{
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int idx, ofs;
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idx = adap->buf_idx;
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ofs = adap->buf_ofs;
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if (adap->buffer[idx].data[ofs] == PT3_BUF_CANARY)
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return 0;
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while (*next_unit(adap, &idx, &ofs) != PT3_BUF_CANARY) {
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u8 *p;
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p = &adap->buffer[adap->buf_idx].data[adap->buf_ofs];
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if (adap->num_discard > 0)
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adap->num_discard--;
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else if (adap->buf_ofs + PT3_ACCESS_UNIT > DATA_BUF_SZ) {
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dvb_dmx_swfilter_packets(&adap->demux, p,
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(DATA_BUF_SZ - adap->buf_ofs) / TS_PACKET_SZ);
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dvb_dmx_swfilter_packets(&adap->demux,
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adap->buffer[idx].data, ofs / TS_PACKET_SZ);
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} else
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dvb_dmx_swfilter_packets(&adap->demux, p,
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PT3_ACCESS_UNIT / TS_PACKET_SZ);
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*p = PT3_BUF_CANARY;
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adap->buf_idx = idx;
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adap->buf_ofs = ofs;
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}
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return 0;
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}
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void pt3_init_dmabuf(struct pt3_adapter *adap)
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{
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int idx, ofs;
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u8 *p;
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idx = 0;
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ofs = 0;
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p = adap->buffer[0].data;
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/* mark the whole buffers as "not written yet" */
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while (idx < adap->num_bufs) {
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p[ofs] = PT3_BUF_CANARY;
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ofs += PT3_ACCESS_UNIT;
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if (ofs >= DATA_BUF_SZ) {
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ofs -= DATA_BUF_SZ;
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idx++;
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p = adap->buffer[idx].data;
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}
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}
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adap->buf_idx = 0;
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adap->buf_ofs = 0;
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}
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void pt3_free_dmabuf(struct pt3_adapter *adap)
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{
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struct pt3_board *pt3;
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int i;
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pt3 = adap->dvb_adap.priv;
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for (i = 0; i < adap->num_bufs; i++)
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dma_free_coherent(&pt3->pdev->dev, DATA_BUF_SZ,
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adap->buffer[i].data, adap->buffer[i].b_addr);
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adap->num_bufs = 0;
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for (i = 0; i < adap->num_desc_bufs; i++)
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dma_free_coherent(&pt3->pdev->dev, PAGE_SIZE,
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adap->desc_buf[i].descs, adap->desc_buf[i].b_addr);
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adap->num_desc_bufs = 0;
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}
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int pt3_alloc_dmabuf(struct pt3_adapter *adap)
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{
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struct pt3_board *pt3;
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void *p;
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int i, j;
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int idx, ofs;
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int num_desc_bufs;
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dma_addr_t data_addr, desc_addr;
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struct xfer_desc *d;
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pt3 = adap->dvb_adap.priv;
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adap->num_bufs = 0;
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adap->num_desc_bufs = 0;
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for (i = 0; i < pt3->num_bufs; i++) {
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p = dma_alloc_coherent(&pt3->pdev->dev, DATA_BUF_SZ,
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&adap->buffer[i].b_addr, GFP_KERNEL);
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if (p == NULL)
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goto failed;
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adap->buffer[i].data = p;
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adap->num_bufs++;
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}
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pt3_init_dmabuf(adap);
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/* build circular-linked pointers (xfer_desc) to the data buffers*/
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idx = 0;
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ofs = 0;
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num_desc_bufs =
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DIV_ROUND_UP(adap->num_bufs * DATA_BUF_XFERS, DESCS_IN_PAGE);
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for (i = 0; i < num_desc_bufs; i++) {
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p = dma_alloc_coherent(&pt3->pdev->dev, PAGE_SIZE,
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&desc_addr, GFP_KERNEL);
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if (p == NULL)
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goto failed;
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adap->num_desc_bufs++;
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adap->desc_buf[i].descs = p;
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adap->desc_buf[i].b_addr = desc_addr;
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if (i > 0) {
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d = &adap->desc_buf[i - 1].descs[DESCS_IN_PAGE - 1];
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d->next_l = lower_32_bits(desc_addr);
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d->next_h = upper_32_bits(desc_addr);
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}
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for (j = 0; j < DESCS_IN_PAGE; j++) {
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data_addr = adap->buffer[idx].b_addr + ofs;
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d = &adap->desc_buf[i].descs[j];
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d->addr_l = lower_32_bits(data_addr);
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d->addr_h = upper_32_bits(data_addr);
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d->size = DATA_XFER_SZ;
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desc_addr += sizeof(struct xfer_desc);
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d->next_l = lower_32_bits(desc_addr);
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d->next_h = upper_32_bits(desc_addr);
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ofs += DATA_XFER_SZ;
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if (ofs >= DATA_BUF_SZ) {
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ofs -= DATA_BUF_SZ;
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idx++;
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if (idx >= adap->num_bufs) {
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desc_addr = adap->desc_buf[0].b_addr;
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d->next_l = lower_32_bits(desc_addr);
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d->next_h = upper_32_bits(desc_addr);
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return 0;
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}
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}
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}
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}
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return 0;
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failed:
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pt3_free_dmabuf(adap);
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return -ENOMEM;
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}
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