617 lines
15 KiB
C
617 lines
15 KiB
C
/*
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* Renesas R-Car Audio DMAC support
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*
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* Copyright (C) 2015 Renesas Electronics Corp.
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* Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/of_dma.h>
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#include "rsnd.h"
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/*
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* Audio DMAC peri peri register
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*/
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#define PDMASAR 0x00
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#define PDMADAR 0x04
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#define PDMACHCR 0x0c
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/* PDMACHCR */
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#define PDMACHCR_DE (1 << 0)
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struct rsnd_dma_ctrl {
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void __iomem *base;
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int dmapp_num;
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};
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#define rsnd_priv_to_dmac(p) ((struct rsnd_dma_ctrl *)(p)->dma)
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/*
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* Audio DMAC
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*/
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static void rsnd_dmaen_complete(void *data)
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{
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struct rsnd_dma *dma = (struct rsnd_dma *)data;
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struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
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struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
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/*
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* Renesas sound Gen1 needs 1 DMAC,
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* Gen2 needs 2 DMAC.
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* In Gen2 case, it are Audio-DMAC, and Audio-DMAC-peri-peri.
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* But, Audio-DMAC-peri-peri doesn't have interrupt,
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* and this driver is assuming that here.
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*
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* If Audio-DMAC-peri-peri has interrpt,
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* rsnd_dai_pointer_update() will be called twice,
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* ant it will breaks io->byte_pos
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*/
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rsnd_dai_pointer_update(io, io->byte_per_period);
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}
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static void rsnd_dmaen_stop(struct rsnd_dma *dma)
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{
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struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
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dmaengine_terminate_all(dmaen->chan);
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}
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static void rsnd_dmaen_start(struct rsnd_dma *dma)
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{
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struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
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struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
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struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
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struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
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struct snd_pcm_substream *substream = io->substream;
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struct device *dev = rsnd_priv_to_dev(priv);
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struct dma_async_tx_descriptor *desc;
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int is_play = rsnd_io_is_play(io);
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desc = dmaengine_prep_dma_cyclic(dmaen->chan,
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substream->runtime->dma_addr,
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snd_pcm_lib_buffer_bytes(substream),
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snd_pcm_lib_period_bytes(substream),
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is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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if (!desc) {
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dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
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return;
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}
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desc->callback = rsnd_dmaen_complete;
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desc->callback_param = dma;
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if (dmaengine_submit(desc) < 0) {
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dev_err(dev, "dmaengine_submit() fail\n");
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return;
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}
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dma_async_issue_pending(dmaen->chan);
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}
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struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node,
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struct rsnd_mod *mod, char *name)
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{
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struct dma_chan *chan;
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struct device_node *np;
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int i = 0;
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for_each_child_of_node(of_node, np) {
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if (i == rsnd_mod_id(mod))
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break;
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i++;
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}
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chan = of_dma_request_slave_channel(np, name);
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of_node_put(np);
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of_node_put(of_node);
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return chan;
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}
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static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_mod *mod_from,
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struct rsnd_mod *mod_to)
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{
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if ((!mod_from && !mod_to) ||
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(mod_from && mod_to))
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return NULL;
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if (mod_from)
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return rsnd_mod_dma_req(mod_from);
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else
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return rsnd_mod_dma_req(mod_to);
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}
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static int rsnd_dmaen_init(struct rsnd_priv *priv, struct rsnd_dma *dma, int id,
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struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
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{
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struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
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struct device *dev = rsnd_priv_to_dev(priv);
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struct dma_slave_config cfg = {};
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struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
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struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
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int is_play = rsnd_io_is_play(io);
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int ret;
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if (dmaen->chan) {
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dev_err(dev, "it already has dma channel\n");
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return -EIO;
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}
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if (dev->of_node) {
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dmaen->chan = rsnd_dmaen_request_channel(mod_from, mod_to);
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} else {
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dma_cap_mask_t mask;
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dma_cap_zero(mask);
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dma_cap_set(DMA_SLAVE, mask);
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dmaen->chan = dma_request_channel(mask, shdma_chan_filter,
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(void *)id);
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}
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if (IS_ERR_OR_NULL(dmaen->chan)) {
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dev_err(dev, "can't get dma channel\n");
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goto rsnd_dma_channel_err;
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}
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cfg.direction = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
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cfg.src_addr = dma->src_addr;
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cfg.dst_addr = dma->dst_addr;
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cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
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cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
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dev_dbg(dev, "dma : %pad -> %pad\n",
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&cfg.src_addr, &cfg.dst_addr);
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ret = dmaengine_slave_config(dmaen->chan, &cfg);
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if (ret < 0)
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goto rsnd_dma_init_err;
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return 0;
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rsnd_dma_init_err:
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rsnd_dma_quit(dma);
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rsnd_dma_channel_err:
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/*
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* DMA failed. try to PIO mode
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* see
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* rsnd_ssi_fallback()
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* rsnd_rdai_continuance_probe()
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*/
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return -EAGAIN;
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}
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static void rsnd_dmaen_quit(struct rsnd_dma *dma)
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{
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struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
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if (dmaen->chan)
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dma_release_channel(dmaen->chan);
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dmaen->chan = NULL;
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}
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static struct rsnd_dma_ops rsnd_dmaen_ops = {
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.start = rsnd_dmaen_start,
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.stop = rsnd_dmaen_stop,
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.init = rsnd_dmaen_init,
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.quit = rsnd_dmaen_quit,
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};
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/*
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* Audio DMAC peri peri
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*/
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static const u8 gen2_id_table_ssiu[] = {
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0x00, /* SSI00 */
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0x04, /* SSI10 */
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0x08, /* SSI20 */
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0x0c, /* SSI3 */
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0x0d, /* SSI4 */
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0x0e, /* SSI5 */
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0x0f, /* SSI6 */
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0x10, /* SSI7 */
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0x11, /* SSI8 */
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0x12, /* SSI90 */
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};
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static const u8 gen2_id_table_scu[] = {
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0x2d, /* SCU_SRCI0 */
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0x2e, /* SCU_SRCI1 */
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0x2f, /* SCU_SRCI2 */
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0x30, /* SCU_SRCI3 */
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0x31, /* SCU_SRCI4 */
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0x32, /* SCU_SRCI5 */
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0x33, /* SCU_SRCI6 */
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0x34, /* SCU_SRCI7 */
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0x35, /* SCU_SRCI8 */
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0x36, /* SCU_SRCI9 */
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};
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static const u8 gen2_id_table_cmd[] = {
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0x37, /* SCU_CMD0 */
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0x38, /* SCU_CMD1 */
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};
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static u32 rsnd_dmapp_get_id(struct rsnd_mod *mod)
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{
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struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
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struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
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struct rsnd_mod *src = rsnd_io_to_mod_src(io);
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struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
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const u8 *entry = NULL;
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int id = rsnd_mod_id(mod);
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int size = 0;
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if (mod == ssi) {
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entry = gen2_id_table_ssiu;
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size = ARRAY_SIZE(gen2_id_table_ssiu);
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} else if (mod == src) {
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entry = gen2_id_table_scu;
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size = ARRAY_SIZE(gen2_id_table_scu);
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} else if (mod == dvc) {
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entry = gen2_id_table_cmd;
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size = ARRAY_SIZE(gen2_id_table_cmd);
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}
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if (!entry)
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return 0xFF;
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if (size <= id)
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return 0xFF;
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return entry[id];
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}
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static u32 rsnd_dmapp_get_chcr(struct rsnd_mod *mod_from,
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struct rsnd_mod *mod_to)
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{
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return (rsnd_dmapp_get_id(mod_from) << 24) +
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(rsnd_dmapp_get_id(mod_to) << 16);
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}
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#define rsnd_dmapp_addr(dmac, dma, reg) \
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(dmac->base + 0x20 + reg + \
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(0x10 * rsnd_dma_to_dmapp(dma)->dmapp_id))
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static void rsnd_dmapp_write(struct rsnd_dma *dma, u32 data, u32 reg)
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{
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struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
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struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
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struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
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struct device *dev = rsnd_priv_to_dev(priv);
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dev_dbg(dev, "w %p : %08x\n", rsnd_dmapp_addr(dmac, dma, reg), data);
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iowrite32(data, rsnd_dmapp_addr(dmac, dma, reg));
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}
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static u32 rsnd_dmapp_read(struct rsnd_dma *dma, u32 reg)
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{
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struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
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struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
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struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
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return ioread32(rsnd_dmapp_addr(dmac, dma, reg));
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}
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static void rsnd_dmapp_stop(struct rsnd_dma *dma)
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{
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int i;
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rsnd_dmapp_write(dma, 0, PDMACHCR);
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for (i = 0; i < 1024; i++) {
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if (0 == rsnd_dmapp_read(dma, PDMACHCR))
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return;
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udelay(1);
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}
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}
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static void rsnd_dmapp_start(struct rsnd_dma *dma)
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{
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struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
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rsnd_dmapp_write(dma, dma->src_addr, PDMASAR);
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rsnd_dmapp_write(dma, dma->dst_addr, PDMADAR);
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rsnd_dmapp_write(dma, dmapp->chcr, PDMACHCR);
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}
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static int rsnd_dmapp_init(struct rsnd_priv *priv, struct rsnd_dma *dma, int id,
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struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
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{
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struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
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struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
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struct device *dev = rsnd_priv_to_dev(priv);
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dmapp->dmapp_id = dmac->dmapp_num;
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dmapp->chcr = rsnd_dmapp_get_chcr(mod_from, mod_to) | PDMACHCR_DE;
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dmac->dmapp_num++;
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rsnd_dmapp_stop(dma);
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dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
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dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);
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return 0;
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}
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static struct rsnd_dma_ops rsnd_dmapp_ops = {
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.start = rsnd_dmapp_start,
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.stop = rsnd_dmapp_stop,
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.init = rsnd_dmapp_init,
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.quit = rsnd_dmapp_stop,
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};
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/*
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* Common DMAC Interface
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*/
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/*
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* DMA read/write register offset
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*
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* RSND_xxx_I_N for Audio DMAC input
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* RSND_xxx_O_N for Audio DMAC output
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* RSND_xxx_I_P for Audio DMAC peri peri input
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* RSND_xxx_O_P for Audio DMAC peri peri output
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*
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* ex) R-Car H2 case
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* mod / DMAC in / DMAC out / DMAC PP in / DMAC pp out
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* SSI : 0xec541000 / 0xec241008 / 0xec24100c
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* SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
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* SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
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* CMD : 0xec500000 / / 0xec008000 0xec308000
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*/
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#define RDMA_SSI_I_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
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#define RDMA_SSI_O_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
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#define RDMA_SSIU_I_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
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#define RDMA_SSIU_O_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
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#define RDMA_SSIU_I_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
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#define RDMA_SSIU_O_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
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#define RDMA_SRC_I_N(addr, i) (addr ##_reg - 0x00500000 + (0x400 * i))
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#define RDMA_SRC_O_N(addr, i) (addr ##_reg - 0x004fc000 + (0x400 * i))
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#define RDMA_SRC_I_P(addr, i) (addr ##_reg - 0x00200000 + (0x400 * i))
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#define RDMA_SRC_O_P(addr, i) (addr ##_reg - 0x001fc000 + (0x400 * i))
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#define RDMA_CMD_O_N(addr, i) (addr ##_reg - 0x004f8000 + (0x400 * i))
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#define RDMA_CMD_O_P(addr, i) (addr ##_reg - 0x001f8000 + (0x400 * i))
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static dma_addr_t
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rsnd_gen2_dma_addr(struct rsnd_priv *priv,
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struct rsnd_mod *mod,
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int is_play, int is_from)
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{
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struct device *dev = rsnd_priv_to_dev(priv);
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struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
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phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
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phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
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int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod);
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int use_src = !!rsnd_io_to_mod_src(io);
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int use_dvc = !!rsnd_io_to_mod_dvc(io);
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int id = rsnd_mod_id(mod);
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struct dma_addr {
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dma_addr_t out_addr;
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dma_addr_t in_addr;
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} dma_addrs[3][2][3] = {
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/* SRC */
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{{{ 0, 0 },
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/* Capture */
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{ RDMA_SRC_O_N(src, id), RDMA_SRC_I_P(src, id) },
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{ RDMA_CMD_O_N(src, id), RDMA_SRC_I_P(src, id) } },
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/* Playback */
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{{ 0, 0, },
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{ RDMA_SRC_O_P(src, id), RDMA_SRC_I_N(src, id) },
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{ RDMA_CMD_O_P(src, id), RDMA_SRC_I_N(src, id) } }
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},
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/* SSI */
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/* Capture */
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{{{ RDMA_SSI_O_N(ssi, id), 0 },
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{ RDMA_SSIU_O_P(ssi, id), 0 },
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{ RDMA_SSIU_O_P(ssi, id), 0 } },
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/* Playback */
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{{ 0, RDMA_SSI_I_N(ssi, id) },
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{ 0, RDMA_SSIU_I_P(ssi, id) },
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{ 0, RDMA_SSIU_I_P(ssi, id) } }
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},
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/* SSIU */
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/* Capture */
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{{{ RDMA_SSIU_O_N(ssi, id), 0 },
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{ RDMA_SSIU_O_P(ssi, id), 0 },
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{ RDMA_SSIU_O_P(ssi, id), 0 } },
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/* Playback */
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{{ 0, RDMA_SSIU_I_N(ssi, id) },
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{ 0, RDMA_SSIU_I_P(ssi, id) },
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{ 0, RDMA_SSIU_I_P(ssi, id) } } },
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};
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/* it shouldn't happen */
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if (use_dvc && !use_src)
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dev_err(dev, "DVC is selected without SRC\n");
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/* use SSIU or SSI ? */
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if (is_ssi && rsnd_ssi_use_busif(mod))
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is_ssi++;
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return (is_from) ?
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dma_addrs[is_ssi][is_play][use_src + use_dvc].out_addr :
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dma_addrs[is_ssi][is_play][use_src + use_dvc].in_addr;
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}
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static dma_addr_t rsnd_dma_addr(struct rsnd_priv *priv,
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struct rsnd_mod *mod,
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int is_play, int is_from)
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{
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/*
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* gen1 uses default DMA addr
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*/
|
|
if (rsnd_is_gen1(priv))
|
|
return 0;
|
|
|
|
if (!mod)
|
|
return 0;
|
|
|
|
return rsnd_gen2_dma_addr(priv, mod, is_play, is_from);
|
|
}
|
|
|
|
#define MOD_MAX 4 /* MEM/SSI/SRC/DVC */
|
|
static void rsnd_dma_of_path(struct rsnd_dma *dma,
|
|
int is_play,
|
|
struct rsnd_mod **mod_from,
|
|
struct rsnd_mod **mod_to)
|
|
{
|
|
struct rsnd_mod *this = rsnd_dma_to_mod(dma);
|
|
struct rsnd_dai_stream *io = rsnd_mod_to_io(this);
|
|
struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
|
|
struct rsnd_mod *src = rsnd_io_to_mod_src(io);
|
|
struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
|
|
struct rsnd_mod *mod[MOD_MAX];
|
|
int i, index;
|
|
|
|
|
|
for (i = 0; i < MOD_MAX; i++)
|
|
mod[i] = NULL;
|
|
|
|
/*
|
|
* in play case...
|
|
*
|
|
* src -> dst
|
|
*
|
|
* mem -> SSI
|
|
* mem -> SRC -> SSI
|
|
* mem -> SRC -> DVC -> SSI
|
|
*/
|
|
mod[0] = NULL; /* for "mem" */
|
|
index = 1;
|
|
for (i = 1; i < MOD_MAX; i++) {
|
|
if (!src) {
|
|
mod[i] = ssi;
|
|
} else if (!dvc) {
|
|
mod[i] = src;
|
|
src = NULL;
|
|
} else {
|
|
if ((!is_play) && (this == src))
|
|
this = dvc;
|
|
|
|
mod[i] = (is_play) ? src : dvc;
|
|
i++;
|
|
mod[i] = (is_play) ? dvc : src;
|
|
src = NULL;
|
|
dvc = NULL;
|
|
}
|
|
|
|
if (mod[i] == this)
|
|
index = i;
|
|
|
|
if (mod[i] == ssi)
|
|
break;
|
|
}
|
|
|
|
if (is_play) {
|
|
*mod_from = mod[index - 1];
|
|
*mod_to = mod[index];
|
|
} else {
|
|
*mod_from = mod[index];
|
|
*mod_to = mod[index - 1];
|
|
}
|
|
}
|
|
|
|
void rsnd_dma_stop(struct rsnd_dma *dma)
|
|
{
|
|
dma->ops->stop(dma);
|
|
}
|
|
|
|
void rsnd_dma_start(struct rsnd_dma *dma)
|
|
{
|
|
dma->ops->start(dma);
|
|
}
|
|
|
|
void rsnd_dma_quit(struct rsnd_dma *dma)
|
|
{
|
|
struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
|
|
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
|
|
struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
|
|
|
|
if (!dmac)
|
|
return;
|
|
|
|
dma->ops->quit(dma);
|
|
}
|
|
|
|
int rsnd_dma_init(struct rsnd_priv *priv, struct rsnd_dma *dma, int id)
|
|
{
|
|
struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
|
|
struct rsnd_mod *mod_from;
|
|
struct rsnd_mod *mod_to;
|
|
struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
|
|
struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
|
|
int is_play = rsnd_io_is_play(io);
|
|
|
|
/*
|
|
* DMA failed. try to PIO mode
|
|
* see
|
|
* rsnd_ssi_fallback()
|
|
* rsnd_rdai_continuance_probe()
|
|
*/
|
|
if (!dmac)
|
|
return -EAGAIN;
|
|
|
|
rsnd_dma_of_path(dma, is_play, &mod_from, &mod_to);
|
|
|
|
dma->src_addr = rsnd_dma_addr(priv, mod_from, is_play, 1);
|
|
dma->dst_addr = rsnd_dma_addr(priv, mod_to, is_play, 0);
|
|
|
|
/* for Gen2 */
|
|
if (mod_from && mod_to)
|
|
dma->ops = &rsnd_dmapp_ops;
|
|
else
|
|
dma->ops = &rsnd_dmaen_ops;
|
|
|
|
/* for Gen1, overwrite */
|
|
if (rsnd_is_gen1(priv))
|
|
dma->ops = &rsnd_dmaen_ops;
|
|
|
|
return dma->ops->init(priv, dma, id, mod_from, mod_to);
|
|
}
|
|
|
|
int rsnd_dma_probe(struct platform_device *pdev,
|
|
const struct rsnd_of_data *of_data,
|
|
struct rsnd_priv *priv)
|
|
{
|
|
struct device *dev = rsnd_priv_to_dev(priv);
|
|
struct rsnd_dma_ctrl *dmac;
|
|
struct resource *res;
|
|
|
|
/*
|
|
* for Gen1
|
|
*/
|
|
if (rsnd_is_gen1(priv))
|
|
return 0;
|
|
|
|
/*
|
|
* for Gen2
|
|
*/
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
|
|
dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
|
|
if (!dmac || !res) {
|
|
dev_err(dev, "dma allocate failed\n");
|
|
return 0; /* it will be PIO mode */
|
|
}
|
|
|
|
dmac->dmapp_num = 0;
|
|
dmac->base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(dmac->base))
|
|
return PTR_ERR(dmac->base);
|
|
|
|
priv->dma = dmac;
|
|
|
|
return 0;
|
|
}
|