static int dynamic_chain_transfer(struct chain_transfer *ct) { int error; struct dma_chain *chain_params = &(ct->chain); struct dma_transfer *transfer = (struct dma_transfer *)&ct->transfers; transfer->finished = 0; transfer->data_correct = 0; transfer->frame_count = 1; transfer->request_success = 0; switch (chain_params->data_type) { case OMAP_DMA_DATA_TYPE_S8: transfer->elements_in_frame = transfer->buffers.buf_size; break; case OMAP_DMA_DATA_TYPE_S16: transfer->elements_in_frame = transfer->buffers.buf_size / 2; break; case OMAP_DMA_DATA_TYPE_S32: transfer->elements_in_frame = transfer->buffers.buf_size / 4; break; default: printk(KERN_ERR "Invalid transfer data type\n"); return 0; } map_to_phys_buffers(&transfer->buffers); printk(KERN_DEBUG "Chaining a transfer to chain id %d\n", chain_params->chain_id); transfer->chained_id = chained_id++; transfer->chain_id = chain_params->chain_id; error = omap_dma_chain_a_transfer(chain_params->chain_id, transfer->buffers.src_buf_phys, transfer->buffers.dest_buf_phys, transfer->elements_in_frame, transfer->frame_count, (void *)transfer); if (error) { printk(KERN_ERR "Error chaining transfer to chain id %d\n", chain_params->chain_id); return 1; } transfer->request_success = 1; printk(KERN_DEBUG " Chained transfer id is %d\n", transfer->chained_id); return 0; }
/* * Start transmitting data through a McBSP interface * id : McBSP interface ID * cbdata : User data to be returned with callback * buf_start_addr : The source address [This should be physical address] * buf_size : Buffer size */ int omap2_mcbsp_send_data(unsigned int id, void *cbdata, dma_addr_t buf_start_addr, u32 buf_size) { struct omap_mcbsp *mcbsp; void __iomem *io_base; u8 enable_tx = 0; int e_count = 0; int f_count = 0; if (!omap_mcbsp_check_valid_id(id)) { printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); return -ENODEV; } mcbsp = id_to_mcbsp_ptr(id); io_base = mcbsp->io_base; mcbsp->tx_cb_arg = cbdata; /* Auto RRST handling logic - disable the Reciever before 1st dma */ if ((mcbsp->auto_reset & OMAP_MCBSP_AUTO_XRST) && (omap_dma_chain_status(mcbsp->dma_tx_lch) == OMAP_DMA_CHAIN_INACTIVE)) { OMAP_MCBSP_WRITE(mcbsp, SPCR2, OMAP_MCBSP_READ(mcbsp, SPCR2) & (~XRST)); enable_tx = 1; } /* * for skip_first and second, we need to set e_count =2, and * f_count = number of frames = number of elements/e_count */ e_count = (buf_size / mcbsp->tx_word_length); if (mcbsp->txskip_alt != OMAP_MCBSP_SKIP_NONE) { /* * number of frames = total number of elements/element count, * However, with double indexing for data transfers, double I * the number of elements need to be transmitted */ f_count = e_count; e_count = 2; } else { f_count = 1; } /* * If the DMA is to be configured to skip the first byte, we need * to jump backwards, so we need to move one chunk forward and ask * dma if we dont want the client driver knowing abt this. */ if (mcbsp->txskip_alt == OMAP_MCBSP_SKIP_FIRST) buf_start_addr += mcbsp->tx_word_length; if (omap_dma_chain_a_transfer(mcbsp->dma_tx_lch, buf_start_addr, mcbsp->phys_base + OMAP_MCBSP_REG_DXR, e_count, f_count, mcbsp) < 0) return -EINVAL; if (mcbsp->tx_dma_chain_state == 0) { if (mcbsp->interface_mode == OMAP_MCBSP_MASTER) omap2_mcbsp_set_srg_fsg(id, OMAP_MCBSP_ENABLE_FSG_SRG); if (omap_start_dma_chain_transfers(mcbsp->dma_tx_lch) < 0) return -EINVAL; mcbsp->tx_dma_chain_state = 1; } /* Auto XRST handling logic - Enable the Reciever after 1st dma */ if (enable_tx && (omap_dma_chain_status(mcbsp->dma_tx_lch) == OMAP_DMA_CHAIN_ACTIVE)) OMAP_MCBSP_WRITE(mcbsp, SPCR2, OMAP_MCBSP_READ(mcbsp, SPCR2) | XRST); return 0; }
int omap2_mcbsp_receive_data(unsigned int id, void *cbdata, dma_addr_t buf_start_addr, u32 buf_size) { struct omap_mcbsp *mcbsp; void __iomem *io_base; int enable_rx = 0; int e_count = 0; int f_count = 0; if (!omap_mcbsp_check_valid_id(id)) { printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1); return -ENODEV; } mcbsp = id_to_mcbsp_ptr(id); io_base = mcbsp->io_base; mcbsp->rx_cb_arg = cbdata; /* Auto RRST handling logic - disable the Reciever before 1st dma */ if ((mcbsp->auto_reset & OMAP_MCBSP_AUTO_RRST) && (omap_dma_chain_status(mcbsp->dma_rx_lch) == OMAP_DMA_CHAIN_INACTIVE)) { OMAP_MCBSP_WRITE(io_base, SPCR1, OMAP_MCBSP_READ(io_base, SPCR1) & (~RRST)); enable_rx = 1; } /* * for skip_first and second, we need to set e_count =2, * and f_count = number of frames = number of elements/e_count */ e_count = (buf_size / mcbsp->rx_word_length); if (mcbsp->rxskip_alt != OMAP_MCBSP_SKIP_NONE) { /* * since the number of frames = total number of elements/element * count, However, with double indexing for data transfers, * double the number of elements need to be transmitted */ f_count = e_count; e_count = 2; } else { f_count = 1; } /* * If the DMA is to be configured to skip the first byte, we need * to jump backwards, so we need to move one chunk forward and * ask dma if we dont want the client driver knowing abt this. */ if (mcbsp->rxskip_alt == OMAP_MCBSP_SKIP_FIRST) buf_start_addr += mcbsp->rx_word_length; if (omap_dma_chain_a_transfer(mcbsp->dma_rx_lch, mcbsp->phys_base + OMAP_MCBSP_REG_DRR, buf_start_addr, e_count, f_count, mcbsp) < 0) { printk(KERN_ERR " Buffer chaining failed \n"); return -EINVAL; } if (mcbsp->rx_dma_chain_state == 0) { if (omap_start_dma_chain_transfers(mcbsp->dma_rx_lch) < 0) return -EINVAL; mcbsp->rx_dma_chain_state = 1; } /* Auto RRST handling logic - Enable the Reciever after 1st dma */ if (enable_rx && (omap_dma_chain_status(mcbsp->dma_rx_lch) == OMAP_DMA_CHAIN_ACTIVE)) OMAP_MCBSP_WRITE(io_base, SPCR1, OMAP_MCBSP_READ(io_base, SPCR1) | RRST); return 0; }