/* * Fifo-attached Serial Interface (FSI) support for SH7724 * * Copyright (C) 2009 Renesas Solutions Corp. * Kuninori Morimoto * * Based on ssi.c * Copyright (c) 2007 Manuel Lauss * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #define DO_FMT 0x0000 #define DOFF_CTL 0x0004 #define DOFF_ST 0x0008 #define DI_FMT 0x000C #define DIFF_CTL 0x0010 #define DIFF_ST 0x0014 #define CKG1 0x0018 #define CKG2 0x001C #define DIDT 0x0020 #define DODT 0x0024 #define MUTE_ST 0x0028 #define REG_END MUTE_ST #define INT_ST 0x0200 #define IEMSK 0x0204 #define IMSK 0x0208 #define MUTE 0x020C #define CLK_RST 0x0210 #define SOFT_RST 0x0214 #define MREG_START INT_ST #define MREG_END SOFT_RST /* DO_FMT */ /* DI_FMT */ #define CR_FMT(param) ((param) << 4) # define CR_MONO 0x0 # define CR_MONO_D 0x1 # define CR_PCM 0x2 # define CR_I2S 0x3 # define CR_TDM 0x4 # define CR_TDM_D 0x5 /* DOFF_CTL */ /* DIFF_CTL */ #define IRQ_HALF 0x00100000 #define FIFO_CLR 0x00000001 /* DOFF_ST */ #define ERR_OVER 0x00000010 #define ERR_UNDER 0x00000001 #define ST_ERR (ERR_OVER | ERR_UNDER) /* CLK_RST */ #define B_CLK 0x00000010 #define A_CLK 0x00000001 /* INT_ST */ #define INT_B_IN (1 << 12) #define INT_B_OUT (1 << 8) #define INT_A_IN (1 << 4) #define INT_A_OUT (1 << 0) #define FSI_RATES SNDRV_PCM_RATE_8000_96000 #define FSI_FMTS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE) /************************************************************************ struct ************************************************************************/ struct fsi_priv { void __iomem *base; struct snd_pcm_substream *substream; struct fsi_master *master; int fifo_max; int chan; int byte_offset; int period_len; int buffer_len; int periods; }; struct fsi_master { void __iomem *base; int irq; struct fsi_priv fsia; struct fsi_priv fsib; struct sh_fsi_platform_info *info; spinlock_t lock; }; /************************************************************************ basic read write function ************************************************************************/ static void __fsi_reg_write(u32 reg, u32 data) { /* valid data area is 24bit */ data &= 0x00ffffff; __raw_writel(data, reg); } static u32 __fsi_reg_read(u32 reg) { return __raw_readl(reg); } static void __fsi_reg_mask_set(u32 reg, u32 mask, u32 data) { u32 val = __fsi_reg_read(reg); val &= ~mask; val |= data & mask; __fsi_reg_write(reg, val); } static void fsi_reg_write(struct fsi_priv *fsi, u32 reg, u32 data) { if (reg > REG_END) return; __fsi_reg_write((u32)(fsi->base + reg), data); } static u32 fsi_reg_read(struct fsi_priv *fsi, u32 reg) { if (reg > REG_END) return 0; return __fsi_reg_read((u32)(fsi->base + reg)); } static void fsi_reg_mask_set(struct fsi_priv *fsi, u32 reg, u32 mask, u32 data) { if (reg > REG_END) return; __fsi_reg_mask_set((u32)(fsi->base + reg), mask, data); } static void fsi_master_write(struct fsi_master *master, u32 reg, u32 data) { unsigned long flags; if ((reg < MREG_START) || (reg > MREG_END)) return; spin_lock_irqsave(&master->lock, flags); __fsi_reg_write((u32)(master->base + reg), data); spin_unlock_irqrestore(&master->lock, flags); } static u32 fsi_master_read(struct fsi_master *master, u32 reg) { u32 ret; unsigned long flags; if ((reg < MREG_START) || (reg > MREG_END)) return 0; spin_lock_irqsave(&master->lock, flags); ret = __fsi_reg_read((u32)(master->base + reg)); spin_unlock_irqrestore(&master->lock, flags); return ret; } static void fsi_master_mask_set(struct fsi_master *master, u32 reg, u32 mask, u32 data) { unsigned long flags; if ((reg < MREG_START) || (reg > MREG_END)) return; spin_lock_irqsave(&master->lock, flags); __fsi_reg_mask_set((u32)(master->base + reg), mask, data); spin_unlock_irqrestore(&master->lock, flags); } /************************************************************************ basic function ************************************************************************/ static struct fsi_master *fsi_get_master(struct fsi_priv *fsi) { return fsi->master; } static int fsi_is_port_a(struct fsi_priv *fsi) { return fsi->master->base == fsi->base; } static struct snd_soc_dai *fsi_get_dai(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_soc_dai_link *machine = rtd->dai; return machine->cpu_dai; } static struct fsi_priv *fsi_get_priv(struct snd_pcm_substream *substream) { struct snd_soc_dai *dai = fsi_get_dai(substream); return dai->private_data; } static u32 fsi_get_info_flags(struct fsi_priv *fsi) { int is_porta = fsi_is_port_a(fsi); struct fsi_master *master = fsi_get_master(fsi); return is_porta ? master->info->porta_flags : master->info->portb_flags; } static int fsi_is_master_mode(struct fsi_priv *fsi, int is_play) { u32 mode; u32 flags = fsi_get_info_flags(fsi); mode = is_play ? SH_FSI_OUT_SLAVE_MODE : SH_FSI_IN_SLAVE_MODE; /* return * 1 : master mode * 0 : slave mode */ return (mode & flags) != mode; } static u32 fsi_port_ab_io_bit(struct fsi_priv *fsi, int is_play) { int is_porta = fsi_is_port_a(fsi); u32 data; if (is_porta) data = is_play ? (1 << 0) : (1 << 4); else data = is_play ? (1 << 8) : (1 << 12); return data; } static void fsi_stream_push(struct fsi_priv *fsi, struct snd_pcm_substream *substream, u32 buffer_len, u32 period_len) { fsi->substream = substream; fsi->buffer_len = buffer_len; fsi->period_len = period_len; fsi->byte_offset = 0; fsi->periods = 0; } static void fsi_stream_pop(struct fsi_priv *fsi) { fsi->substream = NULL; fsi->buffer_len = 0; fsi->period_len = 0; fsi->byte_offset = 0; fsi->periods = 0; } static int fsi_get_fifo_residue(struct fsi_priv *fsi, int is_play) { u32 status; u32 reg = is_play ? DOFF_ST : DIFF_ST; int residue; status = fsi_reg_read(fsi, reg); residue = 0x1ff & (status >> 8); residue *= fsi->chan; return residue; } /************************************************************************ ctrl function ************************************************************************/ static void fsi_irq_enable(struct fsi_priv *fsi, int is_play) { u32 data = fsi_port_ab_io_bit(fsi, is_play); struct fsi_master *master = fsi_get_master(fsi); fsi_master_mask_set(master, IMSK, data, data); fsi_master_mask_set(master, IEMSK, data, data); } static void fsi_irq_disable(struct fsi_priv *fsi, int is_play) { u32 data = fsi_port_ab_io_bit(fsi, is_play); struct fsi_master *master = fsi_get_master(fsi); fsi_master_mask_set(master, IMSK, data, 0); fsi_master_mask_set(master, IEMSK, data, 0); } static void fsi_clk_ctrl(struct fsi_priv *fsi, int enable) { u32 val = fsi_is_port_a(fsi) ? (1 << 0) : (1 << 4); struct fsi_master *master = fsi_get_master(fsi); if (enable) fsi_master_mask_set(master, CLK_RST, val, val); else fsi_master_mask_set(master, CLK_RST, val, 0); } static void fsi_irq_init(struct fsi_priv *fsi, int is_play) { u32 data; u32 ctrl; data = fsi_port_ab_io_bit(fsi, is_play); ctrl = is_play ? DOFF_CTL : DIFF_CTL; /* set IMSK */ fsi_irq_disable(fsi, is_play); /* set interrupt generation factor */ fsi_reg_write(fsi, ctrl, IRQ_HALF); /* clear FIFO */ fsi_reg_mask_set(fsi, ctrl, FIFO_CLR, FIFO_CLR); /* clear interrupt factor */ fsi_master_mask_set(fsi_get_master(fsi), INT_ST, data, 0); } static void fsi_soft_all_reset(struct fsi_master *master) { u32 status = fsi_master_read(master, SOFT_RST); /* port AB reset */ status &= 0x000000ff; fsi_master_write(master, SOFT_RST, status); mdelay(10); /* soft reset */ status &= 0x000000f0; fsi_master_write(master, SOFT_RST, status); status |= 0x00000001; fsi_master_write(master, SOFT_RST, status); mdelay(10); } /* playback interrupt */ static int fsi_data_push(struct fsi_priv *fsi, int startup) { struct snd_pcm_runtime *runtime; struct snd_pcm_substream *substream = NULL; u32 status; int send; int fifo_free; int width; u8 *start; int i, over_period; if (!fsi || !fsi->substream || !fsi->substream->runtime) return -EINVAL; over_period = 0; substream = fsi->substream; runtime = substream->runtime; /* FSI FIFO has limit. * So, this driver can not send periods data at a time */ if (fsi->byte_offset >= fsi->period_len * (fsi->periods + 1)) { over_period = 1; fsi->periods = (fsi->periods + 1) % runtime->periods; if (0 == fsi->periods) fsi->byte_offset = 0; } /* get 1 channel data width */ width = frames_to_bytes(runtime, 1) / fsi->chan; /* get send size for alsa */ send = (fsi->buffer_len - fsi->byte_offset) / width; /* get FIFO free size */ fifo_free = (fsi->fifo_max * fsi->chan) - fsi_get_fifo_residue(fsi, 1); /* size check */ if (fifo_free < send) send = fifo_free; start = runtime->dma_area; start += fsi->byte_offset; switch (width) { case 2: for (i = 0; i < send; i++) fsi_reg_write(fsi, DODT, ((u32)*((u16 *)start + i) << 8)); break; case 4: for (i = 0; i < send; i++) fsi_reg_write(fsi, DODT, *((u32 *)start + i)); break; default: return -EINVAL; } fsi->byte_offset += send * width; status = fsi_reg_read(fsi, DOFF_ST); if (!startup) { struct snd_soc_dai *dai = fsi_get_dai(substream); if (status & ERR_OVER) dev_err(dai->dev, "over run\n"); if (status & ERR_UNDER) dev_err(dai->dev, "under run\n"); } fsi_reg_write(fsi, DOFF_ST, 0); fsi_irq_enable(fsi, 1); if (over_period) snd_pcm_period_elapsed(substream); return 0; } static int fsi_data_pop(struct fsi_priv *fsi, int startup) { struct snd_pcm_runtime *runtime; struct snd_pcm_substream *substream = NULL; u32 status; int free; int fifo_fill; int width; u8 *start; int i, over_period; if (!fsi || !fsi->substream || !fsi->substream->runtime) return -EINVAL; over_period = 0; substream = fsi->substream; runtime = substream->runtime; /* FSI FIFO has limit. * So, this driver can not send periods data at a time */ if (fsi->byte_offset >= fsi->period_len * (fsi->periods + 1)) { over_period = 1; fsi->periods = (fsi->periods + 1) % runtime->periods; if (0 == fsi->periods) fsi->byte_offset = 0; } /* get 1 channel data width */ width = frames_to_bytes(runtime, 1) / fsi->chan; /* get free space for alsa */ free = (fsi->buffer_len - fsi->byte_offset) / width; /* get recv size */ fifo_fill = fsi_get_fifo_residue(fsi, 0); if (free < fifo_fill) fifo_fill = free; start = runtime->dma_area; start += fsi->byte_offset; switch (width) { case 2: for (i = 0; i < fifo_fill; i++) *((u16 *)start + i) = (u16)(fsi_reg_read(fsi, DIDT) >> 8); break; case 4: for (i = 0; i < fifo_fill; i++) *((u32 *)start + i) = fsi_reg_read(fsi, DIDT); break; default: return -EINVAL; } fsi->byte_offset += fifo_fill * width; status = fsi_reg_read(fsi, DIFF_ST); if (!startup) { struct snd_soc_dai *dai = fsi_get_dai(substream); if (status & ERR_OVER) dev_err(dai->dev, "over run\n"); if (status & ERR_UNDER) dev_err(dai->dev, "under run\n"); } fsi_reg_write(fsi, DIFF_ST, 0); fsi_irq_enable(fsi, 0); if (over_period) snd_pcm_period_elapsed(substream); return 0; } static irqreturn_t fsi_interrupt(int irq, void *data) { struct fsi_master *master = data; u32 status = fsi_master_read(master, SOFT_RST) & ~0x00000010; u32 int_st = fsi_master_read(master, INT_ST); /* clear irq status */ fsi_master_write(master, SOFT_RST, status); fsi_master_write(master, SOFT_RST, status | 0x00000010); if (int_st & INT_A_OUT) fsi_data_push(&master->fsia, 0); if (int_st & INT_B_OUT) fsi_data_push(&master->fsib, 0); if (int_st & INT_A_IN) fsi_data_pop(&master->fsia, 0); if (int_st & INT_B_IN) fsi_data_pop(&master->fsib, 0); fsi_master_write(master, INT_ST, 0x0000000); return IRQ_HANDLED; } /************************************************************************ dai ops ************************************************************************/ static int fsi_dai_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct fsi_priv *fsi = fsi_get_priv(substream); const char *msg; u32 flags = fsi_get_info_flags(fsi); u32 fmt; u32 reg; u32 data; int is_play = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); int is_master; int ret = 0; pm_runtime_get_sync(dai->dev); /* CKG1 */ data = is_play ? (1 << 0) : (1 << 4); is_master = fsi_is_master_mode(fsi, is_play); if (is_master) fsi_reg_mask_set(fsi, CKG1, data, data); else fsi_reg_mask_set(fsi, CKG1, data, 0); /* clock inversion (CKG2) */ data = 0; switch (SH_FSI_INVERSION_MASK & flags) { case SH_FSI_LRM_INV: data = 1 << 12; break; case SH_FSI_BRM_INV: data = 1 << 8; break; case SH_FSI_LRS_INV: data = 1 << 4; break; case SH_FSI_BRS_INV: data = 1 << 0; break; } fsi_reg_write(fsi, CKG2, data); /* do fmt, di fmt */ data = 0; reg = is_play ? DO_FMT : DI_FMT; fmt = is_play ? SH_FSI_GET_OFMT(flags) : SH_FSI_GET_IFMT(flags); switch (fmt) { case SH_FSI_FMT_MONO: msg = "MONO"; data = CR_FMT(CR_MONO); fsi->chan = 1; break; case SH_FSI_FMT_MONO_DELAY: msg = "MONO Delay"; data = CR_FMT(CR_MONO_D); fsi->chan = 1; break; case SH_FSI_FMT_PCM: msg = "PCM"; data = CR_FMT(CR_PCM); fsi->chan = 2; break; case SH_FSI_FMT_I2S: msg = "I2S"; data = CR_FMT(CR_I2S); fsi->chan = 2; break; case SH_FSI_FMT_TDM: msg = "TDM"; data = CR_FMT(CR_TDM) | (fsi->chan - 1); fsi->chan = is_play ? SH_FSI_GET_CH_O(flags) : SH_FSI_GET_CH_I(flags); break; case SH_FSI_FMT_TDM_DELAY: msg = "TDM Delay"; data = CR_FMT(CR_TDM_D) | (fsi->chan - 1); fsi->chan = is_play ? SH_FSI_GET_CH_O(flags) : SH_FSI_GET_CH_I(flags); break; default: dev_err(dai->dev, "unknown format.\n"); return -EINVAL; } switch (fsi->chan) { case 1: fsi->fifo_max = 256; break; case 2: fsi->fifo_max = 128; break; case 3: case 4: fsi->fifo_max = 64; break; case 5: case 6: case 7: case 8: fsi->fifo_max = 32; break; default: dev_err(dai->dev, "channel size error.\n"); return -EINVAL; } fsi_reg_write(fsi, reg, data); /* * clear clk reset if master mode */ if (is_master) fsi_clk_ctrl(fsi, 1); /* irq setting */ fsi_irq_init(fsi, is_play); return ret; } static void fsi_dai_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct fsi_priv *fsi = fsi_get_priv(substream); int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; fsi_irq_disable(fsi, is_play); fsi_clk_ctrl(fsi, 0); pm_runtime_put_sync(dai->dev); } static int fsi_dai_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct fsi_priv *fsi = fsi_get_priv(substream); struct snd_pcm_runtime *runtime = substream->runtime; int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; int ret = 0; switch (cmd) { case SNDRV_PCM_TRIGGER_START: fsi_stream_push(fsi, substream, frames_to_bytes(runtime, runtime->buffer_size), frames_to_bytes(runtime, runtime->period_size)); ret = is_play ? fsi_data_push(fsi, 1) : fsi_data_pop(fsi, 1); break; case SNDRV_PCM_TRIGGER_STOP: fsi_irq_disable(fsi, is_play); fsi_stream_pop(fsi); break; } return ret; } static struct snd_soc_dai_ops fsi_dai_ops = { .startup = fsi_dai_startup, .shutdown = fsi_dai_shutdown, .trigger = fsi_dai_trigger, }; /************************************************************************ pcm ops ************************************************************************/ static struct snd_pcm_hardware fsi_pcm_hardware = { .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE, .formats = FSI_FMTS, .rates = FSI_RATES, .rate_min = 8000, .rate_max = 192000, .channels_min = 1, .channels_max = 2, .buffer_bytes_max = 64 * 1024, .period_bytes_min = 32, .period_bytes_max = 8192, .periods_min = 1, .periods_max = 32, .fifo_size = 256, }; static int fsi_pcm_open(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; int ret = 0; snd_soc_set_runtime_hwparams(substream, &fsi_pcm_hardware); ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); return ret; } static int fsi_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)); } static int fsi_hw_free(struct snd_pcm_substream *substream) { return snd_pcm_lib_free_pages(substream); } static snd_pcm_uframes_t fsi_pointer(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct fsi_priv *fsi = fsi_get_priv(substream); long location; location = (fsi->byte_offset - 1); if (location < 0) location = 0; return bytes_to_frames(runtime, location); } static struct snd_pcm_ops fsi_pcm_ops = { .open = fsi_pcm_open, .ioctl = snd_pcm_lib_ioctl, .hw_params = fsi_hw_params, .hw_free = fsi_hw_free, .pointer = fsi_pointer, }; /************************************************************************ snd_soc_platform ************************************************************************/ #define PREALLOC_BUFFER (32 * 1024) #define PREALLOC_BUFFER_MAX (32 * 1024) static void fsi_pcm_free(struct snd_pcm *pcm) { snd_pcm_lib_preallocate_free_for_all(pcm); } static int fsi_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, struct snd_pcm *pcm) { /* * dont use SNDRV_DMA_TYPE_DEV, since it will oops the SH kernel * in MMAP mode (i.e. aplay -M) */ return snd_pcm_lib_preallocate_pages_for_all( pcm, SNDRV_DMA_TYPE_CONTINUOUS, snd_dma_continuous_data(GFP_KERNEL), PREALLOC_BUFFER, PREALLOC_BUFFER_MAX); } /************************************************************************ alsa struct ************************************************************************/ struct snd_soc_dai fsi_soc_dai[] = { { .name = "FSIA", .id = 0, .playback = { .rates = FSI_RATES, .formats = FSI_FMTS, .channels_min = 1, .channels_max = 8, }, .capture = { .rates = FSI_RATES, .formats = FSI_FMTS, .channels_min = 1, .channels_max = 8, }, .ops = &fsi_dai_ops, }, { .name = "FSIB", .id = 1, .playback = { .rates = FSI_RATES, .formats = FSI_FMTS, .channels_min = 1, .channels_max = 8, }, .capture = { .rates = FSI_RATES, .formats = FSI_FMTS, .channels_min = 1, .channels_max = 8, }, .ops = &fsi_dai_ops, }, }; EXPORT_SYMBOL_GPL(fsi_soc_dai); struct snd_soc_platform fsi_soc_platform = { .name = "fsi-pcm", .pcm_ops = &fsi_pcm_ops, .pcm_new = fsi_pcm_new, .pcm_free = fsi_pcm_free, }; EXPORT_SYMBOL_GPL(fsi_soc_platform); /************************************************************************ platform function ************************************************************************/ static int fsi_probe(struct platform_device *pdev) { struct fsi_master *master; struct resource *res; unsigned int irq; int ret; if (0 != pdev->id) { dev_err(&pdev->dev, "current fsi support id 0 only now\n"); return -ENODEV; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq = platform_get_irq(pdev, 0); if (!res || (int)irq <= 0) { dev_err(&pdev->dev, "Not enough FSI platform resources.\n"); ret = -ENODEV; goto exit; } master = kzalloc(sizeof(*master), GFP_KERNEL); if (!master) { dev_err(&pdev->dev, "Could not allocate master\n"); ret = -ENOMEM; goto exit; } master->base = ioremap_nocache(res->start, resource_size(res)); if (!master->base) { ret = -ENXIO; dev_err(&pdev->dev, "Unable to ioremap FSI registers.\n"); goto exit_kfree; } master->irq = irq; master->info = pdev->dev.platform_data; master->fsia.base = master->base; master->fsia.master = master; master->fsib.base = master->base + 0x40; master->fsib.master = master; spin_lock_init(&master->lock); pm_runtime_enable(&pdev->dev); pm_runtime_resume(&pdev->dev); fsi_soc_dai[0].dev = &pdev->dev; fsi_soc_dai[0].private_data = &master->fsia; fsi_soc_dai[1].dev = &pdev->dev; fsi_soc_dai[1].private_data = &master->fsib; fsi_soft_all_reset(master); ret = request_irq(irq, &fsi_interrupt, IRQF_DISABLED, "fsi", master); if (ret) { dev_err(&pdev->dev, "irq request err\n"); goto exit_iounmap; } ret = snd_soc_register_platform(&fsi_soc_platform); if (ret < 0) { dev_err(&pdev->dev, "cannot snd soc register\n"); goto exit_free_irq; } return snd_soc_register_dais(fsi_soc_dai, ARRAY_SIZE(fsi_soc_dai)); exit_free_irq: free_irq(irq, master); exit_iounmap: iounmap(master->base); pm_runtime_disable(&pdev->dev); exit_kfree: kfree(master); master = NULL; exit: return ret; } static int fsi_remove(struct platform_device *pdev) { struct fsi_master *master; master = fsi_get_master(fsi_soc_dai[0].private_data); snd_soc_unregister_dais(fsi_soc_dai, ARRAY_SIZE(fsi_soc_dai)); snd_soc_unregister_platform(&fsi_soc_platform); pm_runtime_disable(&pdev->dev); free_irq(master->irq, master); iounmap(master->base); kfree(master); fsi_soc_dai[0].dev = NULL; fsi_soc_dai[0].private_data = NULL; fsi_soc_dai[1].dev = NULL; fsi_soc_dai[1].private_data = NULL; return 0; } static int fsi_runtime_nop(struct device *dev) { /* Runtime PM callback shared between ->runtime_suspend() * and ->runtime_resume(). Simply returns success. * * This driver re-initializes all registers after * pm_runtime_get_sync() anyway so there is no need * to save and restore registers here. */ return 0; } static struct dev_pm_ops fsi_pm_ops = { .runtime_suspend = fsi_runtime_nop, .runtime_resume = fsi_runtime_nop, }; static struct platform_driver fsi_driver = { .driver = { .name = "sh_fsi", .pm = &fsi_pm_ops, }, .probe = fsi_probe, .remove = fsi_remove, }; static int __init fsi_mobile_init(void) { return platform_driver_register(&fsi_driver); } static void __exit fsi_mobile_exit(void) { platform_driver_unregister(&fsi_driver); } module_init(fsi_mobile_init); module_exit(fsi_mobile_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("SuperH onchip FSI audio driver"); MODULE_AUTHOR("Kuninori Morimoto ");