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ASoC: mmp-sspa: Add Device Tree support 

This makes it possible to select CONFIG_SND_MMP_SOC_SSPA directly, as
opposed to via CONFIG_SND_MMP_SOC, and for the driver to bind to a device
tree node. That makes the driver useful on Device Tree based systems,
with audio-graph-card or simple-card.

The aforementioned card drivers control the master clock themselves and
don't call the set_dai_sysclk() or set_dai_pll(), thus the respective
handlers don't serve any purpose anymore. Instead, they return early and
the hw_params() handler sets the appropriate bitclk itself.

The register range is split into two -- for the RX block and for the TX
block. On a MMP2 there are two pairs of them; the first one has the
clock controller in the middle, while the second just has a hole:

  0xd42a0c00 - 0xd42a0c30 RX1
  0xd42a0c30 - 0xd42a0c40 Clocks
  0xd42a0c80 - 0xd42a0cb0 TX1
  0xd42a0d00 - 0xd42a0d30 RX2
  0xd42a0d80 - 0xd42a0cb0 TX2

For this reason, mmp_sspa_write_reg() and mmp_sspa_read_reg() are
replaced with direct calls to I/O routines.

Tested on a MMP2-based OLPC XO-1.75 laptop with rt5631 coded, mmp_tdma DMA
engine and MMP2 clock controller glued together with audio-graph-card.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200511210134.1224532-12-lkundrak@v3.sk
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lubomir Rintel 2020-05-11 23:01:34 +02:00 committed by Mark Brown
parent ce5955866d
commit a97e384ba7
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
3 changed files with 113 additions and 74 deletions
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20
sound/soc/pxa/Kconfig
View File

@ -9,14 +9,8 @@ config SND_PXA2XX_SOC
to select the audio interfaces to support below. to select the audio interfaces to support below.
config SND_MMP_SOC config SND_MMP_SOC
bool "Soc Audio for Marvell MMP chips" bool
depends on ARCH_MMP
select MMP_SRAM select MMP_SRAM
select SND_SOC_GENERIC_DMAENGINE_PCM
select SND_ARM
help
Say Y if you want to add support for codecs attached to
the MMP SSPA interface.
config SND_PXA2XX_AC97 config SND_PXA2XX_AC97
tristate tristate
@ -39,7 +33,13 @@ config SND_PXA_SOC_SSP
select SND_PXA2XX_LIB select SND_PXA2XX_LIB
config SND_MMP_SOC_SSPA config SND_MMP_SOC_SSPA
tristate tristate "SoC Audio via MMP SSPA ports"
depends on ARCH_MMP
select SND_SOC_GENERIC_DMAENGINE_PCM
select SND_ARM
help
Say Y if you want to add support for codecs attached to
the MMP SSPA interface.
config SND_PXA2XX_SOC_CORGI config SND_PXA2XX_SOC_CORGI
tristate "SoC Audio support for Sharp Zaurus SL-C7x0" tristate "SoC Audio support for Sharp Zaurus SL-C7x0"
@ -232,8 +232,8 @@ config SND_PXA2XX_SOC_IMOTE2
config SND_MMP_SOC_BROWNSTONE config SND_MMP_SOC_BROWNSTONE
tristate "SoC Audio support for Marvell Brownstone" tristate "SoC Audio support for Marvell Brownstone"
depends on SND_MMP_SOC && MACH_BROWNSTONE && I2C depends on SND_MMP_SOC_SSPA && MACH_BROWNSTONE && I2C
select SND_MMP_SOC_SSPA select SND_MMP_SOC
select MFD_WM8994 select MFD_WM8994
select SND_SOC_WM8994 select SND_SOC_WM8994
help help

139
sound/soc/pxa/mmp-sspa.c
View File

@ -28,27 +28,20 @@
* SSPA audio private data * SSPA audio private data
*/ */
struct sspa_priv { struct sspa_priv {
void __iomem *mmio_base; void __iomem *tx_base;
void __iomem *rx_base;
struct snd_dmaengine_dai_dma_data playback_dma_data; struct snd_dmaengine_dai_dma_data playback_dma_data;
struct snd_dmaengine_dai_dma_data capture_dma_data; struct snd_dmaengine_dai_dma_data capture_dma_data;
struct clk *clk; struct clk *clk;
struct clk *audio_clk; struct clk *audio_clk;
struct clk *sysclk; struct clk *sysclk;
int running_cnt; int running_cnt;
u32 sp; u32 sp;
u32 ctrl; u32 ctrl;
}; };
static void mmp_sspa_write_reg(struct sspa_priv *sspa, u32 reg, u32 val)
{
__raw_writel(val, sspa->mmio_base + reg);
}
static u32 mmp_sspa_read_reg(struct sspa_priv *sspa, u32 reg)
{
return __raw_readl(sspa->mmio_base + reg);
}
static void mmp_sspa_tx_enable(struct sspa_priv *sspa) static void mmp_sspa_tx_enable(struct sspa_priv *sspa)
{ {
unsigned int sspa_sp = sspa->sp; unsigned int sspa_sp = sspa->sp;
@ -56,7 +49,7 @@ static void mmp_sspa_tx_enable(struct sspa_priv *sspa)
sspa_sp &= ~SSPA_SP_MSL; sspa_sp &= ~SSPA_SP_MSL;
sspa_sp |= SSPA_SP_S_EN; sspa_sp |= SSPA_SP_S_EN;
sspa_sp |= SSPA_SP_WEN; sspa_sp |= SSPA_SP_WEN;
mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp); __raw_writel(sspa_sp, sspa->tx_base + SSPA_SP);
} }
static void mmp_sspa_tx_disable(struct sspa_priv *sspa) static void mmp_sspa_tx_disable(struct sspa_priv *sspa)
@ -66,7 +59,7 @@ static void mmp_sspa_tx_disable(struct sspa_priv *sspa)
sspa_sp &= ~SSPA_SP_MSL; sspa_sp &= ~SSPA_SP_MSL;
sspa_sp &= ~SSPA_SP_S_EN; sspa_sp &= ~SSPA_SP_S_EN;
sspa_sp |= SSPA_SP_WEN; sspa_sp |= SSPA_SP_WEN;
mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp); __raw_writel(sspa_sp, sspa->tx_base + SSPA_SP);
} }
static void mmp_sspa_rx_enable(struct sspa_priv *sspa) static void mmp_sspa_rx_enable(struct sspa_priv *sspa)
@ -75,7 +68,7 @@ static void mmp_sspa_rx_enable(struct sspa_priv *sspa)
sspa_sp |= SSPA_SP_S_EN; sspa_sp |= SSPA_SP_S_EN;
sspa_sp |= SSPA_SP_WEN; sspa_sp |= SSPA_SP_WEN;
mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp); __raw_writel(sspa_sp, sspa->rx_base + SSPA_SP);
} }
static void mmp_sspa_rx_disable(struct sspa_priv *sspa) static void mmp_sspa_rx_disable(struct sspa_priv *sspa)
@ -84,7 +77,7 @@ static void mmp_sspa_rx_disable(struct sspa_priv *sspa)
sspa_sp &= ~SSPA_SP_S_EN; sspa_sp &= ~SSPA_SP_S_EN;
sspa_sp |= SSPA_SP_WEN; sspa_sp |= SSPA_SP_WEN;
mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp); __raw_writel(sspa_sp, sspa->rx_base + SSPA_SP);
} }
static int mmp_sspa_startup(struct snd_pcm_substream *substream, static int mmp_sspa_startup(struct snd_pcm_substream *substream,
@ -105,7 +98,6 @@ static void mmp_sspa_shutdown(struct snd_pcm_substream *substream,
clk_disable_unprepare(sspa->clk); clk_disable_unprepare(sspa->clk);
clk_disable_unprepare(sspa->sysclk); clk_disable_unprepare(sspa->sysclk);
} }
/* /*
@ -115,8 +107,12 @@ static int mmp_sspa_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int dir) int clk_id, unsigned int freq, int dir)
{ {
struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai); struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai);
struct device *dev = cpu_dai->component->dev;
int ret = 0; int ret = 0;
if (dev->of_node)
return -ENOTSUPP;
switch (clk_id) { switch (clk_id) {
case MMP_SSPA_CLK_AUDIO: case MMP_SSPA_CLK_AUDIO:
ret = clk_set_rate(sspa->audio_clk, freq); ret = clk_set_rate(sspa->audio_clk, freq);
@ -139,8 +135,12 @@ static int mmp_sspa_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id,
unsigned int freq_out) unsigned int freq_out)
{ {
struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai); struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai);
struct device *dev = cpu_dai->component->dev;
int ret = 0; int ret = 0;
if (dev->of_node)
return -ENOTSUPP;
switch (pll_id) { switch (pll_id) {
case MMP_SYSCLK: case MMP_SYSCLK:
ret = clk_set_rate(sspa->sysclk, freq_out); ret = clk_set_rate(sspa->sysclk, freq_out);
@ -213,6 +213,7 @@ static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai) struct snd_soc_dai *dai)
{ {
struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai); struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
struct device *dev = dai->component->dev;
u32 sspa_ctrl = sspa->ctrl; u32 sspa_ctrl = sspa->ctrl;
int bits; int bits;
int bitval; int bitval;
@ -238,7 +239,7 @@ static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
return -EINVAL; return -EINVAL;
} }
if (params_channels(params) == 2) if (dev->of_node || params_channels(params) == 2)
sspa_ctrl |= SSPA_CTL_XPH; sspa_ctrl |= SSPA_CTL_XPH;
sspa_ctrl &= ~SSPA_CTL_XWDLEN1_MASK; sspa_ctrl &= ~SSPA_CTL_XWDLEN1_MASK;
@ -256,12 +257,17 @@ static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
sspa->sp &= ~SSPA_TXSP_FPER_MASK; sspa->sp &= ~SSPA_TXSP_FPER_MASK;
sspa->sp |= SSPA_TXSP_FPER(bits * 2 - 1); sspa->sp |= SSPA_TXSP_FPER(bits * 2 - 1);
if (dev->of_node) {
clk_set_rate(sspa->clk, params_rate(params) *
params_channels(params) * bits);
}
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl); __raw_writel(sspa_ctrl, sspa->tx_base + SSPA_CTL);
mmp_sspa_write_reg(sspa, SSPA_TXFIFO_LL, 0x1); __raw_writel(0x1, sspa->tx_base + SSPA_FIFO_UL);
} else { } else {
mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl); __raw_writel(sspa_ctrl, sspa->rx_base + SSPA_CTL);
mmp_sspa_write_reg(sspa, SSPA_RXFIFO_UL, 0x0); __raw_writel(0x0, sspa->rx_base + SSPA_FIFO_UL);
} }
return 0; return 0;
@ -410,19 +416,19 @@ static int mmp_sspa_open(struct snd_soc_component *component,
pm_runtime_get_sync(component->dev); pm_runtime_get_sync(component->dev);
/* we can only change the settings if the port is not in use */ /* we can only change the settings if the port is not in use */
if ((mmp_sspa_read_reg(sspa, SSPA_TXSP) & SSPA_SP_S_EN) || if ((__raw_readl(sspa->tx_base + SSPA_SP) & SSPA_SP_S_EN) ||
(mmp_sspa_read_reg(sspa, SSPA_RXSP) & SSPA_SP_S_EN)) { (__raw_readl(sspa->rx_base + SSPA_SP) & SSPA_SP_S_EN)) {
dev_err(component->dev, dev_err(component->dev,
"can't change hardware dai format: stream is in use\n"); "can't change hardware dai format: stream is in use\n");
return -EBUSY; return -EBUSY;
} }
mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa->sp); __raw_writel(sspa->sp, sspa->tx_base + SSPA_SP);
mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa->sp); __raw_writel(sspa->sp, sspa->rx_base + SSPA_SP);
sspa->sp &= ~(SSPA_SP_S_RST | SSPA_SP_FFLUSH); sspa->sp &= ~(SSPA_SP_S_RST | SSPA_SP_FFLUSH);
mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa->sp); __raw_writel(sspa->sp, sspa->tx_base + SSPA_SP);
mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa->sp); __raw_writel(sspa->sp, sspa->rx_base + SSPA_SP);
/* /*
* FIXME: hw issue, for the tx serial port, * FIXME: hw issue, for the tx serial port,
@ -431,10 +437,10 @@ static int mmp_sspa_open(struct snd_soc_component *component,
* The master/slave mode has been set in the * The master/slave mode has been set in the
* rx port. * rx port.
*/ */
mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa->sp & ~SSPA_SP_MSL); __raw_writel(sspa->sp & ~SSPA_SP_MSL, sspa->tx_base + SSPA_SP);
mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa->ctrl); __raw_writel(sspa->ctrl, sspa->tx_base + SSPA_CTL);
mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa->ctrl); __raw_writel(sspa->ctrl, sspa->rx_base + SSPA_CTL);
return 0; return 0;
} }
@ -462,22 +468,51 @@ static int asoc_mmp_sspa_probe(struct platform_device *pdev)
if (!sspa) if (!sspa)
return -ENOMEM; return -ENOMEM;
sspa->mmio_base = devm_platform_ioremap_resource(pdev, 0); if (pdev->dev.of_node) {
if (IS_ERR(sspa->mmio_base)) sspa->rx_base = devm_platform_ioremap_resource(pdev, 0);
return PTR_ERR(sspa->mmio_base); if (IS_ERR(sspa->rx_base))
return PTR_ERR(sspa->rx_base);
sspa->clk = devm_clk_get(&pdev->dev, NULL); sspa->tx_base = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(sspa->clk)) if (IS_ERR(sspa->tx_base))
return PTR_ERR(sspa->clk); return PTR_ERR(sspa->tx_base);
sspa->audio_clk = clk_get(NULL, "mmp-audio"); sspa->clk = devm_clk_get(&pdev->dev, "bitclk");
if (IS_ERR(sspa->audio_clk)) if (IS_ERR(sspa->clk))
return PTR_ERR(sspa->audio_clk); return PTR_ERR(sspa->clk);
sspa->sysclk = clk_get(NULL, "mmp-sysclk"); sspa->audio_clk = devm_clk_get(&pdev->dev, "audio");
if (IS_ERR(sspa->sysclk)) { if (IS_ERR(sspa->audio_clk))
clk_put(sspa->audio_clk); return PTR_ERR(sspa->audio_clk);
return PTR_ERR(sspa->sysclk); } else {
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (res == NULL)
return -ENODEV;
sspa->rx_base = devm_ioremap(&pdev->dev, res->start, 0x30);
if (IS_ERR(sspa->rx_base))
return PTR_ERR(sspa->rx_base);
sspa->tx_base = devm_ioremap(&pdev->dev,
res->start + 0x80, 0x30);
if (IS_ERR(sspa->tx_base))
return PTR_ERR(sspa->tx_base);
sspa->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(sspa->clk))
return PTR_ERR(sspa->clk);
sspa->audio_clk = clk_get(NULL, "mmp-audio");
if (IS_ERR(sspa->audio_clk))
return PTR_ERR(sspa->audio_clk);
sspa->sysclk = clk_get(NULL, "mmp-sysclk");
if (IS_ERR(sspa->sysclk)) {
clk_put(sspa->audio_clk);
return PTR_ERR(sspa->sysclk);
}
} }
pm_runtime_enable(&pdev->dev); pm_runtime_enable(&pdev->dev);
clk_prepare_enable(sspa->audio_clk); clk_prepare_enable(sspa->audio_clk);
@ -486,8 +521,8 @@ static int asoc_mmp_sspa_probe(struct platform_device *pdev)
sspa->playback_dma_data.maxburst = 4; sspa->playback_dma_data.maxburst = 4;
sspa->capture_dma_data.maxburst = 4; sspa->capture_dma_data.maxburst = 4;
/* You know, these addresses are actually ignored. */ /* You know, these addresses are actually ignored. */
sspa->playback_dma_data.addr = SSPA_TXD; sspa->capture_dma_data.addr = SSPA_D;
sspa->capture_dma_data.addr = SSPA_RXD; sspa->playback_dma_data.addr = 0x80 + SSPA_D;
if (pdev->dev.of_node) { if (pdev->dev.of_node) {
int ret; int ret;
@ -508,14 +543,28 @@ static int asoc_mmp_sspa_remove(struct platform_device *pdev)
clk_disable_unprepare(sspa->audio_clk); clk_disable_unprepare(sspa->audio_clk);
pm_runtime_disable(&pdev->dev); pm_runtime_disable(&pdev->dev);
if (pdev->dev.of_node)
return 0;
clk_put(sspa->audio_clk); clk_put(sspa->audio_clk);
clk_put(sspa->sysclk); clk_put(sspa->sysclk);
return 0; return 0;
} }
#ifdef CONFIG_OF
static const struct of_device_id mmp_sspa_of_match[] = {
{ .compatible = "marvell,mmp-sspa" },
{},
};
MODULE_DEVICE_TABLE(of, mmp_sspa_of_match);
#endif
static struct platform_driver asoc_mmp_sspa_driver = { static struct platform_driver asoc_mmp_sspa_driver = {
.driver = { .driver = {
.name = "mmp-sspa-dai", .name = "mmp-sspa-dai",
.of_match_table = of_match_ptr(mmp_sspa_of_match),
}, },
.probe = asoc_mmp_sspa_probe, .probe = asoc_mmp_sspa_probe,
.remove = asoc_mmp_sspa_remove, .remove = asoc_mmp_sspa_remove,

28
sound/soc/pxa/mmp-sspa.h
View File

@ -10,25 +10,15 @@
/* /*
* SSPA Registers * SSPA Registers
*/ */
#define SSPA_RXD (0x00) #define SSPA_D (0x00)
#define SSPA_RXID (0x04) #define SSPA_ID (0x04)
#define SSPA_RXCTL (0x08) #define SSPA_CTL (0x08)
#define SSPA_RXSP (0x0c) #define SSPA_SP (0x0c)
#define SSPA_RXFIFO_UL (0x10) #define SSPA_FIFO_UL (0x10)
#define SSPA_RXINT_MASK (0x14) #define SSPA_INT_MASK (0x14)
#define SSPA_RXC (0x18) #define SSPA_C (0x18)
#define SSPA_RXFIFO_NOFS (0x1c) #define SSPA_FIFO_NOFS (0x1c)
#define SSPA_RXFIFO_SIZE (0x20) #define SSPA_FIFO_SIZE (0x20)
#define SSPA_TXD (0x80)
#define SSPA_TXID (0x84)
#define SSPA_TXCTL (0x88)
#define SSPA_TXSP (0x8c)
#define SSPA_TXFIFO_LL (0x90)
#define SSPA_TXINT_MASK (0x94)
#define SSPA_TXC (0x98)
#define SSPA_TXFIFO_NOFS (0x9c)
#define SSPA_TXFIFO_SIZE (0xa0)
/* SSPA Control Register */ /* SSPA Control Register */
#define SSPA_CTL_XPH (1 << 31) /* Read Phase */ #define SSPA_CTL_XPH (1 << 31) /* Read Phase */