This patch cleans up probe() function by moving all Device Tree related code into a separate function. It allows the probe() to be Device Tree independent. This will be very useful for future integration of imx-ssi driver which has similar functionalities while exists only because it supports non-DT cases.
This patch also moves symmetric_channels of AC97 from the probe to the structure snd_soc_dai_driver for simplification.
Additionally, since PowerPC and AC97 use the same pdev pointer to register a platform device, this patch also unifies related code.
Signed-off-by: Nicolin Chen nicoleotsuka@gmail.com Tested-by: Caleb Crome caleb@crome.org --- sound/soc/fsl/fsl_ssi.c | 204 +++++++++++++++++++++++++----------------------- 1 file changed, 108 insertions(+), 96 deletions(-)
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c index 716603c..0754eeb 100644 --- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -234,8 +234,12 @@ struct fsl_ssi_soc_data { * * @fiq_params: FIQ stream filtering parameters * - * @pdev: Pointer to pdev when using fsl-ssi as sound card (ppc only) - * TODO: Should be replaced with simple-sound-card + * @card_pdev: Platform_device pointer when using fsl-ssi as sound card + * (PowerPC or AC97 only) + * @card_name: Platform_device name when using fsl-ssi as sound card + * (PowerPC or AC97 only) + * @card_idx: The index of SSI when registering a sound card + * (PowerPC or AC97 only) * * @dbg_stats: Debugging statistics * @@ -279,7 +283,9 @@ struct fsl_ssi {
struct imx_pcm_fiq_params fiq_params;
- struct platform_device *pdev; + struct platform_device *card_pdev; + char card_name[32]; + u32 card_idx;
struct fsl_ssi_dbg dbg_stats;
@@ -1123,6 +1129,7 @@ static const struct snd_soc_component_driver fsl_ssi_component = {
static struct snd_soc_dai_driver fsl_ssi_ac97_dai = { .bus_control = true, + .symmetric_channels = 1, .probe = fsl_ssi_dai_probe, .playback = { .stream_name = "AC97 Playback", @@ -1274,9 +1281,7 @@ static void make_lowercase(char *s) static int fsl_ssi_imx_probe(struct platform_device *pdev, struct fsl_ssi *ssi, void __iomem *iomem) { - struct device_node *np = pdev->dev.of_node; struct device *dev = &pdev->dev; - u32 dmas[4]; int ret;
/* Backward compatible for a DT without ipg clock name assigned */ @@ -1310,14 +1315,8 @@ static int fsl_ssi_imx_probe(struct platform_device *pdev, ssi->dma_params_tx.addr = ssi->ssi_phys + REG_SSI_STX0; ssi->dma_params_rx.addr = ssi->ssi_phys + REG_SSI_SRX0;
- /* Set to dual FIFO mode according to the SDMA sciprt */ - ret = of_property_read_u32_array(np, "dmas", dmas, 4); - if (ssi->use_dma && !ret && dmas[2] == IMX_DMATYPE_SSI_DUAL) { - ssi->use_dual_fifo = true; - /* - * Use even numbers to avoid channel swap due to SDMA - * script design - */ + /* Use even numbers to avoid channel swap due to SDMA script design */ + if (ssi->use_dual_fifo) { ssi->dma_params_tx.maxburst &= ~0x1; ssi->dma_params_rx.maxburst &= ~0x1; } @@ -1358,42 +1357,103 @@ static void fsl_ssi_imx_clean(struct platform_device *pdev, struct fsl_ssi *ssi) clk_disable_unprepare(ssi->clk); }
-static int fsl_ssi_probe(struct platform_device *pdev) +static int fsl_ssi_probe_from_dt(struct fsl_ssi *ssi) { - struct snd_soc_dai_driver *cpu_dai_drv; - struct fsl_ssi *ssi; - int ret = 0; - struct device_node *np = pdev->dev.of_node; - struct device *dev = &pdev->dev; + struct device *dev = ssi->dev; + struct device_node *np = dev->of_node; const struct of_device_id *of_id; const char *p, *sprop; const uint32_t *iprop; - struct resource *res; - void __iomem *iomem; - char name[64]; - struct regmap_config regconfig = fsl_ssi_regconfig; + u32 dmas[4]; + int ret;
of_id = of_match_device(fsl_ssi_ids, dev); if (!of_id || !of_id->data) return -EINVAL;
- ssi = devm_kzalloc(dev, sizeof(*ssi), GFP_KERNEL); - if (!ssi) - return -ENOMEM; - ssi->soc = of_id->data; - ssi->dev = dev; + + ret = of_property_match_string(np, "clock-names", "ipg"); + /* Get error code if not found */ + ssi->has_ipg_clk_name = ret >= 0;
/* Check if being used in AC97 mode */ sprop = of_get_property(np, "fsl,mode", NULL); - if (sprop) { - if (!strcmp(sprop, "ac97-slave")) - ssi->dai_fmt = FSLSSI_AC97_DAIFMT; + if (sprop && !strcmp(sprop, "ac97-slave")) { + ssi->dai_fmt = FSLSSI_AC97_DAIFMT; + + ret = of_property_read_u32(np, "cell-index", &ssi->card_idx); + if (ret) { + dev_err(dev, "failed to get SSI index property\n"); + return -EINVAL; + } + strcpy(ssi->card_name, "ac97-codec"); }
/* Select DMA or FIQ */ ssi->use_dma = !of_property_read_bool(np, "fsl,fiq-stream-filter");
+ /* In synchronous mode, STCK and STFS ports are used by RX as well */ + if (!of_find_property(np, "fsl,ssi-asynchronous", NULL)) + ssi->synchronous = true; + + /* Fetch FIFO depth; Set to 8 for older DT without this property */ + iprop = of_get_property(np, "fsl,fifo-depth", NULL); + if (iprop) + ssi->fifo_depth = be32_to_cpup(iprop); + else + ssi->fifo_depth = 8; + + /* Use dual FIFO mode depending on the support from SDMA script */ + ret = of_property_read_u32_array(np, "dmas", dmas, 4); + if (ssi->use_dma && !ret && dmas[2] == IMX_DMATYPE_SSI_DUAL) + ssi->use_dual_fifo = true; + + /* + * Backward compatible for older bindings by manually triggering the + * machine driver's probe(). Use /compatible property, including the + * address of CPU DAI driver structure, as the name of machine driver + * + * If card_name is set by AC97 earlier, bypass here since it uses a + * different name to register the device. + */ + if (!ssi->card_name[0] && of_get_property(np, "codec-handle", NULL)) { + sprop = of_get_property(of_find_node_by_path("/"), + "compatible", NULL); + /* Strip "fsl," in the compatible name if applicable */ + p = strrchr(sprop, ','); + if (p) + sprop = p + 1; + snprintf(ssi->card_name, sizeof(ssi->card_name), + "snd-soc-%s", sprop); + make_lowercase(ssi->card_name); + ssi->card_idx = 0; + } + + return 0; +} + +static int fsl_ssi_probe(struct platform_device *pdev) +{ + struct regmap_config regconfig = fsl_ssi_regconfig; + struct snd_soc_dai_driver *cpu_dai_drv; + struct device *dev = &pdev->dev; + struct fsl_ssi *ssi; + struct resource *res; + void __iomem *iomem; + int ret = 0; + + ssi = devm_kzalloc(dev, sizeof(*ssi), GFP_KERNEL); + if (!ssi) + return -ENOMEM; + + ssi->dev = dev; + + /* Probe from DT */ + ret = fsl_ssi_probe_from_dt(ssi); + if (ret) + return ret; + if (fsl_ssi_is_ac97(ssi)) { cpu_dai_drv = &fsl_ssi_ac97_dai; fsl_ac97_data = ssi; @@ -1415,15 +1475,11 @@ static int fsl_ssi_probe(struct platform_device *pdev) REG_SSI_SRMSK / sizeof(uint32_t) + 1; }
- ret = of_property_match_string(np, "clock-names", "ipg"); - if (ret < 0) { - ssi->has_ipg_clk_name = false; - ssi->regs = devm_regmap_init_mmio(dev, iomem, ®config); - } else { - ssi->has_ipg_clk_name = true; + if (ssi->has_ipg_clk_name) ssi->regs = devm_regmap_init_mmio_clk(dev, "ipg", iomem, ®config); - } + else + ssi->regs = devm_regmap_init_mmio(dev, iomem, ®config); if (IS_ERR(ssi->regs)) { dev_err(dev, "failed to init register map\n"); return PTR_ERR(ssi->regs); @@ -1435,24 +1491,13 @@ static int fsl_ssi_probe(struct platform_device *pdev) return ssi->irq; }
- /* Set software limitations for synchronous mode */ - if (!of_find_property(np, "fsl,ssi-asynchronous", NULL)) { - if (!fsl_ssi_is_ac97(ssi)) { - cpu_dai_drv->symmetric_rates = 1; - cpu_dai_drv->symmetric_samplebits = 1; - ssi->synchronous = true; - } - + /* Set software limitations for synchronous mode except AC97 */ + if (ssi->synchronous && !fsl_ssi_is_ac97(ssi)) { + cpu_dai_drv->symmetric_rates = 1; cpu_dai_drv->symmetric_channels = 1; + cpu_dai_drv->symmetric_samplebits = 1; }
- /* Fetch FIFO depth; Set to 8 for older DT without this property */ - iprop = of_get_property(np, "fsl,fifo-depth", NULL); - if (iprop) - ssi->fifo_depth = be32_to_cpup(iprop); - else - ssi->fifo_depth = 8; - /* * Configure TX and RX DMA watermarks -- when to send a DMA request * @@ -1517,50 +1562,17 @@ static int fsl_ssi_probe(struct platform_device *pdev) if (ret) goto error_asoc_register;
- /* Bypass it if using newer DT bindings of ASoC machine drivers */ - if (!of_get_property(np, "codec-handle", NULL)) - goto done; - - /* - * Backward compatible for older bindings by manually triggering the - * machine driver's probe(). Use /compatible property, including the - * address of CPU DAI driver structure, as the name of machine driver. - */ - sprop = of_get_property(of_find_node_by_path("/"), "compatible", NULL); - /* Sometimes the compatible name has a "fsl," prefix, so we strip it. */ - p = strrchr(sprop, ','); - if (p) - sprop = p + 1; - snprintf(name, sizeof(name), "snd-soc-%s", sprop); - make_lowercase(name); - - ssi->pdev = platform_device_register_data(dev, name, 0, NULL, 0); - if (IS_ERR(ssi->pdev)) { - ret = PTR_ERR(ssi->pdev); - dev_err(dev, "failed to register platform: %d\n", ret); - goto error_sound_card; - } - -done: /* Initially configures SSI registers */ fsl_ssi_hw_init(ssi);
- if (fsl_ssi_is_ac97(ssi)) { - u32 ssi_idx; - - ret = of_property_read_u32(np, "cell-index", &ssi_idx); - if (ret) { - dev_err(dev, "failed to get SSI index property\n"); - goto error_sound_card; - } - - ssi->pdev = platform_device_register_data(NULL, "ac97-codec", - ssi_idx, NULL, 0); - if (IS_ERR(ssi->pdev)) { - ret = PTR_ERR(ssi->pdev); - dev_err(dev, - "failed to register AC97 codec platform: %d\n", - ret); + /* Register a platform device for older bindings or AC97 */ + if (ssi->card_name[0]) { + ssi->card_pdev = platform_device_register_data(dev, + ssi->card_name, ssi->card_idx, NULL, 0); + if (IS_ERR(ssi->card_pdev)) { + ret = PTR_ERR(ssi->card_pdev); + dev_err(dev, "failed to register %s: %d\n", + ssi->card_name, ret); goto error_sound_card; } } @@ -1590,8 +1602,8 @@ static int fsl_ssi_remove(struct platform_device *pdev)
fsl_ssi_debugfs_remove(&ssi->dbg_stats);
- if (ssi->pdev) - platform_device_unregister(ssi->pdev); + if (ssi->card_pdev) + platform_device_unregister(ssi->card_pdev);
if (ssi->soc->imx) fsl_ssi_imx_clean(pdev, ssi);