#include <linux/sh_dma.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/workqueue.h>
#include <sound/soc.h>
+#include <sound/pcm_params.h>
#include <sound/sh_fsi.h>
/* PortA/PortB register */
* --> go to codecs
*/
+/*
+ * FSI clock
+ *
+ * FSIxCLK [CPG] (ick) -------> |
+ * |-> FSI_DIV (div)-> FSI2
+ * FSIxCK [external] (xck) ---> |
+ */
+
/*
* struct
*/
*/
struct dma_chan *chan;
struct sh_dmae_slave slave; /* see fsi_handler_init() */
- struct tasklet_struct tasklet;
+ struct work_struct work;
dma_addr_t dma;
};
+struct fsi_clk {
+ /* see [FSI clock] */
+ struct clk *own;
+ struct clk *xck;
+ struct clk *ick;
+ struct clk *div;
+ int (*set_rate)(struct device *dev,
+ struct fsi_priv *fsi,
+ unsigned long rate);
+
+ unsigned long rate;
+ unsigned int count;
+};
+
struct fsi_priv {
void __iomem *base;
struct fsi_master *master;
struct fsi_stream playback;
struct fsi_stream capture;
+ struct fsi_clk clock;
+
u32 fmt;
int chan_num:16;
/*
* clock function
*/
+static int fsi_clk_init(struct device *dev,
+ struct fsi_priv *fsi,
+ int xck,
+ int ick,
+ int div,
+ int (*set_rate)(struct device *dev,
+ struct fsi_priv *fsi,
+ unsigned long rate))
+{
+ struct fsi_clk *clock = &fsi->clock;
+ int is_porta = fsi_is_port_a(fsi);
+
+ clock->xck = NULL;
+ clock->ick = NULL;
+ clock->div = NULL;
+ clock->rate = 0;
+ clock->count = 0;
+ clock->set_rate = set_rate;
+
+ clock->own = devm_clk_get(dev, NULL);
+ if (IS_ERR(clock->own))
+ return -EINVAL;
+
+ /* external clock */
+ if (xck) {
+ clock->xck = devm_clk_get(dev, is_porta ? "xcka" : "xckb");
+ if (IS_ERR(clock->xck)) {
+ dev_err(dev, "can't get xck clock\n");
+ return -EINVAL;
+ }
+ if (clock->xck == clock->own) {
+ dev_err(dev, "cpu doesn't support xck clock\n");
+ return -EINVAL;
+ }
+ }
+
+ /* FSIACLK/FSIBCLK */
+ if (ick) {
+ clock->ick = devm_clk_get(dev, is_porta ? "icka" : "ickb");
+ if (IS_ERR(clock->ick)) {
+ dev_err(dev, "can't get ick clock\n");
+ return -EINVAL;
+ }
+ if (clock->ick == clock->own) {
+ dev_err(dev, "cpu doesn't support ick clock\n");
+ return -EINVAL;
+ }
+ }
+
+ /* FSI-DIV */
+ if (div) {
+ clock->div = devm_clk_get(dev, is_porta ? "diva" : "divb");
+ if (IS_ERR(clock->div)) {
+ dev_err(dev, "can't get div clock\n");
+ return -EINVAL;
+ }
+ if (clock->div == clock->own) {
+ dev_err(dev, "cpu doens't support div clock\n");
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+#define fsi_clk_invalid(fsi) fsi_clk_valid(fsi, 0)
+static void fsi_clk_valid(struct fsi_priv *fsi, unsigned long rate)
+{
+ fsi->clock.rate = rate;
+}
+
+static int fsi_clk_is_valid(struct fsi_priv *fsi)
+{
+ return fsi->clock.set_rate &&
+ fsi->clock.rate;
+}
+
+static int fsi_clk_enable(struct device *dev,
+ struct fsi_priv *fsi,
+ unsigned long rate)
+{
+ struct fsi_clk *clock = &fsi->clock;
+ int ret = -EINVAL;
+
+ if (!fsi_clk_is_valid(fsi))
+ return ret;
+
+ if (0 == clock->count) {
+ ret = clock->set_rate(dev, fsi, rate);
+ if (ret < 0) {
+ fsi_clk_invalid(fsi);
+ return ret;
+ }
+
+ if (clock->xck)
+ clk_enable(clock->xck);
+ if (clock->ick)
+ clk_enable(clock->ick);
+ if (clock->div)
+ clk_enable(clock->div);
+
+ clock->count++;
+ }
+
+ return ret;
+}
+
+static int fsi_clk_disable(struct device *dev,
+ struct fsi_priv *fsi)
+{
+ struct fsi_clk *clock = &fsi->clock;
+
+ if (!fsi_clk_is_valid(fsi))
+ return -EINVAL;
+
+ if (1 == clock->count--) {
+ if (clock->xck)
+ clk_disable(clock->xck);
+ if (clock->ick)
+ clk_disable(clock->ick);
+ if (clock->div)
+ clk_disable(clock->div);
+ }
+
+ return 0;
+}
+
+static int fsi_clk_set_ackbpf(struct device *dev,
+ struct fsi_priv *fsi,
+ int ackmd, int bpfmd)
+{
+ u32 data = 0;
+
+ /* check ackmd/bpfmd relationship */
+ if (bpfmd > ackmd) {
+ dev_err(dev, "unsupported rate (%d/%d)\n", ackmd, bpfmd);
+ return -EINVAL;
+ }
+
+ /* ACKMD */
+ switch (ackmd) {
+ case 512:
+ data |= (0x0 << 12);
+ break;
+ case 256:
+ data |= (0x1 << 12);
+ break;
+ case 128:
+ data |= (0x2 << 12);
+ break;
+ case 64:
+ data |= (0x3 << 12);
+ break;
+ case 32:
+ data |= (0x4 << 12);
+ break;
+ default:
+ dev_err(dev, "unsupported ackmd (%d)\n", ackmd);
+ return -EINVAL;
+ }
+
+ /* BPFMD */
+ switch (bpfmd) {
+ case 32:
+ data |= (0x0 << 8);
+ break;
+ case 64:
+ data |= (0x1 << 8);
+ break;
+ case 128:
+ data |= (0x2 << 8);
+ break;
+ case 256:
+ data |= (0x3 << 8);
+ break;
+ case 512:
+ data |= (0x4 << 8);
+ break;
+ case 16:
+ data |= (0x7 << 8);
+ break;
+ default:
+ dev_err(dev, "unsupported bpfmd (%d)\n", bpfmd);
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "ACKMD/BPFMD = %d/%d\n", ackmd, bpfmd);
+
+ fsi_reg_mask_set(fsi, CKG1, (ACKMD_MASK | BPFMD_MASK) , data);
+ udelay(10);
+
+ return 0;
+}
+
+static int fsi_clk_set_rate_external(struct device *dev,
+ struct fsi_priv *fsi,
+ unsigned long rate)
+{
+ struct clk *xck = fsi->clock.xck;
+ struct clk *ick = fsi->clock.ick;
+ unsigned long xrate;
+ int ackmd, bpfmd;
+ int ret = 0;
+
+ /* check clock rate */
+ xrate = clk_get_rate(xck);
+ if (xrate % rate) {
+ dev_err(dev, "unsupported clock rate\n");
+ return -EINVAL;
+ }
+
+ clk_set_parent(ick, xck);
+ clk_set_rate(ick, xrate);
+
+ bpfmd = fsi->chan_num * 32;
+ ackmd = xrate / rate;
+
+ dev_dbg(dev, "external/rate = %ld/%ld\n", xrate, rate);
+
+ ret = fsi_clk_set_ackbpf(dev, fsi, ackmd, bpfmd);
+ if (ret < 0)
+ dev_err(dev, "%s failed", __func__);
+
+ return ret;
+}
+
+static int fsi_clk_set_rate_cpg(struct device *dev,
+ struct fsi_priv *fsi,
+ unsigned long rate)
+{
+ struct clk *ick = fsi->clock.ick;
+ struct clk *div = fsi->clock.div;
+ unsigned long target = 0; /* 12288000 or 11289600 */
+ unsigned long actual, cout;
+ unsigned long diff, min;
+ unsigned long best_cout, best_act;
+ int adj;
+ int ackmd, bpfmd;
+ int ret = -EINVAL;
+
+ if (!(12288000 % rate))
+ target = 12288000;
+ if (!(11289600 % rate))
+ target = 11289600;
+ if (!target) {
+ dev_err(dev, "unsupported rate\n");
+ return ret;
+ }
+
+ bpfmd = fsi->chan_num * 32;
+ ackmd = target / rate;
+ ret = fsi_clk_set_ackbpf(dev, fsi, ackmd, bpfmd);
+ if (ret < 0) {
+ dev_err(dev, "%s failed", __func__);
+ return ret;
+ }
+
+ /*
+ * The clock flow is
+ *
+ * [CPG] = cout => [FSI_DIV] = audio => [FSI] => [codec]
+ *
+ * But, it needs to find best match of CPG and FSI_DIV
+ * combination, since it is difficult to generate correct
+ * frequency of audio clock from ick clock only.
+ * Because ick is created from its parent clock.
+ *
+ * target = rate x [512/256/128/64]fs
+ * cout = round(target x adjustment)
+ * actual = cout / adjustment (by FSI-DIV) ~= target
+ * audio = actual
+ */
+ min = ~0;
+ best_cout = 0;
+ best_act = 0;
+ for (adj = 1; adj < 0xffff; adj++) {
+
+ cout = target * adj;
+ if (cout > 100000000) /* max clock = 100MHz */
+ break;
+
+ /* cout/actual audio clock */
+ cout = clk_round_rate(ick, cout);
+ actual = cout / adj;
+
+ /* find best frequency */
+ diff = abs(actual - target);
+ if (diff < min) {
+ min = diff;
+ best_cout = cout;
+ best_act = actual;
+ }
+ }
+
+ ret = clk_set_rate(ick, best_cout);
+ if (ret < 0) {
+ dev_err(dev, "ick clock failed\n");
+ return -EIO;
+ }
+
+ ret = clk_set_rate(div, clk_round_rate(div, best_act));
+ if (ret < 0) {
+ dev_err(dev, "div clock failed\n");
+ return -EIO;
+ }
+
+ dev_dbg(dev, "ick/div = %ld/%ld\n",
+ clk_get_rate(ick), clk_get_rate(div));
+
+ return ret;
+}
+
static int fsi_set_master_clk(struct device *dev, struct fsi_priv *fsi,
long rate, int enable)
{
set_rate_func set_rate = fsi_get_info_set_rate(fsi);
int ret;
- if (!set_rate)
- return 0;
+ /*
+ * CAUTION
+ *
+ * set_rate will be deleted
+ */
+ if (!set_rate) {
+ if (enable)
+ return fsi_clk_enable(dev, fsi, rate);
+ else
+ return fsi_clk_disable(dev, fsi);
+ }
ret = set_rate(dev, rate, enable);
if (ret < 0) /* error */
snd_pcm_period_elapsed(io->substream);
}
-static void fsi_dma_do_tasklet(unsigned long data)
+static void fsi_dma_do_work(struct work_struct *work)
{
- struct fsi_stream *io = (struct fsi_stream *)data;
+ struct fsi_stream *io = container_of(work, struct fsi_stream, work);
struct fsi_priv *fsi = fsi_stream_to_priv(io);
struct snd_soc_dai *dai;
struct dma_async_tx_descriptor *desc;
* FIXME
*
* In DMAEngine case, codec and FSI cannot be started simultaneously
- * since FSI is using tasklet.
+ * since FSI is using the scheduler work queue.
* Therefore, in capture case, probably FSI FIFO will have got
* overflow error in this point.
* in that case, DMA cannot start transfer until error was cleared.
static int fsi_dma_transfer(struct fsi_priv *fsi, struct fsi_stream *io)
{
- tasklet_schedule(&io->tasklet);
+ schedule_work(&io->work);
return 0;
}
return fsi_stream_probe(fsi, dev);
}
- tasklet_init(&io->tasklet, fsi_dma_do_tasklet, (unsigned long)io);
+ INIT_WORK(&io->work, fsi_dma_do_work);
return 0;
}
static int fsi_dma_remove(struct fsi_priv *fsi, struct fsi_stream *io)
{
- tasklet_kill(&io->tasklet);
+ cancel_work_sync(&io->work);
fsi_stream_stop(fsi, io);
/* fifo init */
fsi_fifo_init(fsi, io, dev);
+ /* start master clock */
+ if (fsi_is_clk_master(fsi))
+ return fsi_set_master_clk(dev, fsi, fsi->rate, 1);
+
return 0;
}
-static void fsi_hw_shutdown(struct fsi_priv *fsi,
+static int fsi_hw_shutdown(struct fsi_priv *fsi,
struct device *dev)
{
+ /* stop master clock */
if (fsi_is_clk_master(fsi))
- fsi_set_master_clk(dev, fsi, fsi->rate, 0);
+ return fsi_set_master_clk(dev, fsi, fsi->rate, 0);
+
+ return 0;
}
static int fsi_dai_startup(struct snd_pcm_substream *substream,
{
struct fsi_priv *fsi = fsi_get_priv(substream);
+ fsi_clk_invalid(fsi);
fsi->rate = 0;
return 0;
{
struct fsi_priv *fsi = fsi_get_priv(substream);
+ fsi_clk_invalid(fsi);
fsi->rate = 0;
}
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
fsi_stream_init(fsi, io, substream);
- fsi_hw_startup(fsi, io, dai->dev);
- ret = fsi_stream_transfer(io);
- if (0 == ret)
+ if (!ret)
+ ret = fsi_hw_startup(fsi, io, dai->dev);
+ if (!ret)
+ ret = fsi_stream_transfer(io);
+ if (!ret)
fsi_stream_start(fsi, io);
break;
case SNDRV_PCM_TRIGGER_STOP:
- fsi_hw_shutdown(fsi, dai->dev);
+ if (!ret)
+ ret = fsi_hw_shutdown(fsi, dai->dev);
fsi_stream_stop(fsi, io);
fsi_stream_quit(fsi, io);
break;
return -EINVAL;
}
- if (fsi_is_clk_master(fsi) && !set_rate) {
- dev_err(dai->dev, "platform doesn't have set_rate\n");
- return -EINVAL;
+ if (fsi_is_clk_master(fsi)) {
+ /*
+ * CAUTION
+ *
+ * set_rate will be deleted
+ */
+ if (set_rate)
+ dev_warn(dai->dev, "set_rate will be removed soon\n");
+
+ switch (flags & SH_FSI_CLK_MASK) {
+ case SH_FSI_CLK_EXTERNAL:
+ fsi_clk_init(dai->dev, fsi, 1, 1, 0,
+ fsi_clk_set_rate_external);
+ break;
+ case SH_FSI_CLK_CPG:
+ fsi_clk_init(dai->dev, fsi, 0, 1, 1,
+ fsi_clk_set_rate_cpg);
+ break;
+ }
}
/* set format */
struct snd_soc_dai *dai)
{
struct fsi_priv *fsi = fsi_get_priv(substream);
- long rate = params_rate(params);
- int ret;
-
- if (!fsi_is_clk_master(fsi))
- return 0;
- ret = fsi_set_master_clk(dai->dev, fsi, rate, 1);
- if (ret < 0)
- return ret;
-
- fsi->rate = rate;
+ if (fsi_is_clk_master(fsi)) {
+ fsi->rate = params_rate(params);
+ fsi_clk_valid(fsi, fsi->rate);
+ }
- return ret;
+ return 0;
}
static const struct snd_soc_dai_ops fsi_dai_ops = {
.rates = FSI_RATES,
.rate_min = 8000,
.rate_max = 192000,
- .channels_min = 1,
+ .channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = 64 * 1024,
.period_bytes_min = 32,
.playback = {
.rates = FSI_RATES,
.formats = FSI_FMTS,
- .channels_min = 1,
- .channels_max = 8,
+ .channels_min = 2,
+ .channels_max = 2,
},
.capture = {
.rates = FSI_RATES,
.formats = FSI_FMTS,
- .channels_min = 1,
- .channels_max = 8,
+ .channels_min = 2,
+ .channels_max = 2,
},
.ops = &fsi_dai_ops,
},
.playback = {
.rates = FSI_RATES,
.formats = FSI_FMTS,
- .channels_min = 1,
- .channels_max = 8,
+ .channels_min = 2,
+ .channels_max = 2,
},
.capture = {
.rates = FSI_RATES,
.formats = FSI_FMTS,
- .channels_min = 1,
- .channels_max = 8,
+ .channels_min = 2,
+ .channels_max = 2,
},
.ops = &fsi_dai_ops,
},
pm_runtime_enable(&pdev->dev);
dev_set_drvdata(&pdev->dev, master);
- ret = request_irq(irq, &fsi_interrupt, 0,
+ ret = devm_request_irq(&pdev->dev, irq, &fsi_interrupt, 0,
id_entry->name, master);
if (ret) {
dev_err(&pdev->dev, "irq request err\n");
ret = snd_soc_register_platform(&pdev->dev, &fsi_soc_platform);
if (ret < 0) {
dev_err(&pdev->dev, "cannot snd soc register\n");
- goto exit_free_irq;
+ goto exit_fsib;
}
ret = snd_soc_register_dais(&pdev->dev, fsi_soc_dai,
exit_snd_soc:
snd_soc_unregister_platform(&pdev->dev);
-exit_free_irq:
- free_irq(irq, master);
exit_fsib:
pm_runtime_disable(&pdev->dev);
fsi_stream_remove(&master->fsib);
master = dev_get_drvdata(&pdev->dev);
- free_irq(master->irq, master);
pm_runtime_disable(&pdev->dev);
snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(fsi_soc_dai));
return;
fsi_hw_startup(fsi, io, dev);
-
- if (fsi_is_clk_master(fsi) && fsi->rate)
- fsi_set_master_clk(dev, fsi, fsi->rate, 1);
-
fsi_stream_start(fsi, io);
}
projects / karo-tx-linux.git / blobdiff