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