📄 s3c2410-uda1341.c
字号:
/* * Philips UDA1341 Audio Device Driver for S3C2410 Linux * * Copyright (C) 2002 MIZI Research, Inc. */#include <linux/module.h>#include <linux/init.h>#include <linux/types.h>#include <linux/fs.h>#include <linux/mm.h>#include <linux/slab.h>#include <linux/delay.h>#include <linux/sched.h>#include <linux/poll.h>#include <linux/interrupt.h>#include <linux/errno.h>#include <linux/sound.h>#include <linux/soundcard.h>#include <linux/pm.h>#include <asm/uaccess.h>#include <asm/io.h>#include <asm/hardware.h>#include <asm/semaphore.h>#include <asm/dma.h>#include <asm/arch/regs-gpio.h>#include <asm/arch-s3c2410/regs-iis.h>#include <asm/arch/regs-clock.h>#include <linux/dma-mapping.h>#undef DEBUG#ifdef DEBUG#define DPRINTK( x... ) printk( ##x )#else#define DPRINTK( x... )#endifstatic void init_s3c2410_iis_bus_rx(void);static void init_s3c2410_iis_bus_tx(void);#define DEF_VOLUME 65/* UDA1341 Register bits */#define UDA1341_ADDR 0x14#define UDA1341_REG_DATA0 (UDA1341_ADDR + 0)#define UDA1341_REG_STATUS (UDA1341_ADDR + 2)/* status control */#define STAT0 (0x00)#define STAT0_RST (1 << 6)#define STAT0_SC_MASK (3 << 4)#define STAT0_SC_512FS (0 << 4)#define STAT0_SC_384FS (1 << 4)#define STAT0_SC_256FS (2 << 4)#define STAT0_IF_MASK (7 << 1)#define STAT0_IF_I2S (0 << 1)#define STAT0_IF_LSB16 (1 << 1)#define STAT0_IF_LSB18 (2 << 1)#define STAT0_IF_LSB20 (3 << 1)#define STAT0_IF_MSB (4 << 1)#define STAT0_IF_LSB16MSB (5 << 1)#define STAT0_IF_LSB18MSB (6 << 1)#define STAT0_IF_LSB20MSB (7 << 1)#define STAT0_DC_FILTER (1 << 0)#define STAT0_DC_NO_FILTER (0 << 0)#define STAT1 (0x80)#define STAT1_DAC_GAIN (1 << 6) /* gain of DAC */#define STAT1_ADC_GAIN (1 << 5) /* gain of ADC */#define STAT1_ADC_POL (1 << 4) /* polarity of ADC */#define STAT1_DAC_POL (1 << 3) /* polarity of DAC */#define STAT1_DBL_SPD (1 << 2) /* double speed playback */#define STAT1_ADC_ON (1 << 1) /* ADC powered */#define STAT1_DAC_ON (1 << 0) /* DAC powered *//* data0 direct control */#define DATA0 (0x00)#define DATA0_VOLUME_MASK (0x3f)#define DATA0_VOLUME(x) (x)#define DATA1 (0x40)#define DATA1_BASS(x) ((x) << 2)#define DATA1_BASS_MASK (15 << 2)#define DATA1_TREBLE(x) ((x))#define DATA1_TREBLE_MASK (3)#define DATA2 (0x80)#define DATA2_PEAKAFTER (0x1 << 5)#define DATA2_DEEMP_NONE (0x0 << 3)#define DATA2_DEEMP_32KHz (0x1 << 3)#define DATA2_DEEMP_44KHz (0x2 << 3)#define DATA2_DEEMP_48KHz (0x3 << 3)#define DATA2_MUTE (0x1 << 2)#define DATA2_FILTER_FLAT (0x0 << 0)#define DATA2_FILTER_MIN (0x1 << 0)#define DATA2_FILTER_MAX (0x3 << 0)/* data0 extend control */#define EXTADDR(n) (0xc0 | (n))#define EXTDATA(d) (0xe0 | (d))#define EXT0 0#define EXT0_CH1_GAIN(x) (x)#define EXT1 1#define EXT1_CH2_GAIN(x) (x)#define EXT2 2#define EXT2_MIC_GAIN_MASK (7 << 2)#define EXT2_MIC_GAIN(x) ((x) << 2)#define EXT2_MIXMODE_DOUBLEDIFF (0)#define EXT2_MIXMODE_CH1 (1)#define EXT2_MIXMODE_CH2 (2)#define EXT2_MIXMODE_MIX (3)#define EXT4 4#define EXT4_AGC_ENABLE (1 << 4)#define EXT4_INPUT_GAIN_MASK (3)#define EXT4_INPUT_GAIN(x) ((x) & 3)#define EXT5 5#define EXT5_INPUT_GAIN(x) ((x) >> 2)#define EXT6 6#define EXT6_AGC_CONSTANT_MASK (7 << 2)#define EXT6_AGC_CONSTANT(x) ((x) << 2)#define EXT6_AGC_LEVEL_MASK (3)#define EXT6_AGC_LEVEL(x) (x)#define AUDIO_NAME "UDA1341"#define AUDIO_NAME_VERBOSE "UDA1341 audio driver"#define AUDIO_FMT_MASK (AFMT_S16_LE)#define AUDIO_FMT_DEFAULT (AFMT_S16_LE)#define AUDIO_CHANNELS_DEFAULT 2#define AUDIO_RATE_DEFAULT 22050#define AUDIO_NBFRAGS_DEFAULT 8#define AUDIO_FRAGSIZE_DEFAULT 8192#define S_CLOCK_FREQ 384#define PCM_ABS(a) (a < 0 ? -a : a)typedef struct { int size; /* buffer size */ char *start; /* point to actual buffer（内存虚拟地址起始地址） */ dma_addr_t dma_addr; /* physical buffer address （内存物理地址起始地址）*/ struct semaphore sem; /* down before touching the buffer */ int master; /* owner for buffer allocation, contain size when true （内存大小）*/} audio_buf_t;/*这是一个管理多缓冲区的结构体，结构体audio_stream_t 为音频流数据组成了一个环形缓冲区。（audio_buf_t *buffers 同触摸屏驱动中struct TS_DEV 结构中的TS_RET buf[MAX_TS_BUF] 意义一样，都为环形缓冲区）用audio_buf_t 来管理一段内存，在用audio_stream_t 来管理N 个audio_buf_t。*/typedef struct { audio_buf_t *buffers; /* pointer to audio buffer structures */ audio_buf_t *buf; /* current buffer used by read/write */ u_int buf_idx; /* index for the pointer above */ u_int fragsize; /* fragment i.e. buffer size （音频缓冲区片大小）*/ u_int nbfrags; /* nbr of fragments （音频缓冲区片数量）*/ dmach_t dma_ch; /* DMA channel (channel2 for audio) */} audio_stream_t;static audio_stream_t output_stream;/*全局变量 输出音频缓冲区*/static audio_stream_t input_stream; /* input全局变量作为输入音频缓冲区 */#define NEXT_BUF(_s_,_b_) { \ (_s_)->_b_##_idx++; \ (_s_)->_b_##_idx %= (_s_)->nbfrags; \ (_s_)->_b_ = (_s_)->buffers + (_s_)->_b_##_idx; }static u_int audio_rate;static int audio_channels;static int audio_fmt;static u_int audio_fragsize;static u_int audio_nbfrags;static int audio_rd_refcount;static int audio_wr_refcount;#define audio_active (audio_rd_refcount | audio_wr_refcount)static int audio_dev_dsp;static int audio_dev_mixer;static int audio_mix_modcnt;static int uda1341_volume;static u8 uda_sampling;static int uda1341_boost;static int mixer_igain=0x4; /* -6db*//* * For the dma chanel user */static struct s3c2410_dma_client s3c2410_dma_client_out ={ .name ="I2SSDO",};static struct s3c2410_dma_client s3c2410_dma_client_in={ .name ="I2SSDI",};#define FIN_NEW 12000000#define GET_PCLK_NEW 0#define DMA_CH1 1 //输入音频缓冲区的DMA 通道设为通道1#define DMA_CH2 2 //将输出音频缓冲区的DMA 通道设为通道2#ifndef __ASSEMBLY__#define UData(Data) ((unsigned long) (Data))#else#define UData(Data) (Data)#endif#define FInsrt(Value, Field) \ (UData (Value) << FShft (Field))#define fIISPSR_A Fld(5, 5) /* Prescaler Control A */#define IISPSR_A(x) FInsrt((x), fIISPSR_A)#define fIISPSR_B Fld(5, 0) /* Prescaler Control B */#define IISPSR_B(x) FInsrt((x), fIISPSR_B) #define fPLL_MDIV Fld(8,12)#define fPLL_PDIV Fld(6,4)#define fPLL_SDIV Fld(2,0)#define Fld(Size, Shft) (((Size) << 16) + (Shft))#define FShft(Field) ((Field) & 0x0000FFFF)#define FAlnMsk(Field) ((UData (1) << FSize (Field)) - 1)#define FSize(Field) ((Field) >> 16)#define FExtr(Data, Field) ((UData (Data) >> FShft (Field)) & FAlnMsk (Field))#define GET_MDIV(x) FExtr(x, fPLL_MDIV)#define GET_PDIV(x) FExtr(x, fPLL_PDIV)#define GET_SDIV(x) FExtr(x, fPLL_SDIV)/* Functions for the callback when dma transfered done */static void audio_dmaout_done_callback(s3c2410_dma_chan_t *r_value,void *buf_id, int size,s3c2410_dma_buffresult_t result);static void audio_dmain_done_callback(s3c2410_dma_chan_t *r_value,void *buf_id, int size,s3c2410_dma_buffresult_t result);/* * To enble Full-Duplex */static void init_s3c2410_iis_bus_txrx(void){ unsigned long tmp_read; __raw_writel(0,S3C2410_SBC_IISCON); __raw_writel(0,S3C2410_SBC_IISMOD); __raw_writel(0,S3C2410_SBC_IISFCON); /* 8 kHZ, 384fs */ __raw_writel((IISPSR_A(iispsr_value(S_CLOCK_FREQ, 8000)) | IISPSR_B(iispsr_value(S_CLOCK_FREQ, 8000))) ,S3C2410_SBC_IISPSR); __raw_writel(S3C2410_IISCON_RXDMAEN /* (1 << 4):Receive DMA service request */ | S3C2410_IISCON_TXDMAEN /* (1 << 5):Transmit DMA service request */ | (1<<1) /* (1 << 1):IIS Prescaler Enable */ ,S3C2410_SBC_IISCON); __raw_writel((0<<8) /* (0 << 8):Master mode */ | S3C2410_IISMOD_RXMODE /* (1 << 6):Receive mode */ | S3C2410_IISMOD_TXMODE /* (2 << 6):Transmit mode */ | S3C2410_IISMOD_LR_LLOW /* (0 << 5):Low for left channel */ | S3C2410_IISMOD_MSB /* (1 << 4):MSB-justified format */ | S3C2410_IISMOD_16BIT /* (1 << 3):Serial data bit/channel is 16 bit */ | (1<<2) /* (1 << 2):Master clock freq = 384 fs */ | S3C2410_IISMOD_32FS /* (1 << 0):32 fs */ ,S3C2410_SBC_IISMOD); __raw_writel(S3C2410_IISFCON_TXDMA /* (1 << 15):Transmit FIFO access mode:DMA */ | S3C2410_IISFCON_RXDMA /* (1 << 14):Receive FIFO access mode:DMA */ | S3C2410_IISFCON_TXENABLE /* (1 << 13):Transmit FIFO enable */ | S3C2410_IISFCON_RXENABLE /* (1 << 12):Receive FIFO access enable */ ,S3C2410_SBC_IISFCON); tmp_read=__raw_readl(S3C2410_SBC_IISCON); tmp_read=tmp_read | S3C2410_IISCON_IISEN; /* IIS enable(start) */ __raw_writel(tmp_read,S3C2410_SBC_IISCON);}/*分别将GPIO_L3MODE 引脚设为低电平，将GPIO_L3DATA 引脚设为低电平，将GPIO_L3CLOCK 引脚设为高电平。根据UDA1341 芯片datasheet 里的时序图，把GPIO_L3MODE 引脚设为低电平，就是地址模式。 udelay(1); 调用udelay 函数来短暂延时1us。在驱动程序中用udelay 函数来延时微秒级时间，mdelay 函数来延时毫秒级时间，而在应用程序中用usleep 函数来延时微秒级时间，sleep 函数来延时毫秒级时间。 */static void uda1341_l3_address(u8 data){ int i; unsigned long flags; local_irq_save(flags);//在对GPIO 口设置或操作前总要先调用 //该宏函数来保存IRQ 中断使能状态，并禁止IRQ 中断。 /* * To set Bit 2 of GPBDAT Register (physical address:0x56000014) * to be 0 */ s3c2410_gpio_setpin(S3C2410_GPB2,0); /* * To set Bit 3 of GPBDAT Register (physical address:0x56000014) * to be 0 */ s3c2410_gpio_setpin(S3C2410_GPB3,0); /* * To set Bit 4 of GPBDAT Register (physical address:0x56000014) * to 0 */ s3c2410_gpio_setpin(S3C2410_GPB4,1); udelay(1); /* 接下来就是将一个字节一位一位通过GPIO 口发送出去 的循环结构，从该字节的最低位（D0）开始发送。 若D0 为1，则设置GPIO_L3DATA 引脚为高电平，否则为 低电平。同时需要控制GPIO_L3CLOCK 引脚的时钟信号， 数据会在时钟的上升沿写入UDA1341 芯片，所以需要 在时钟引脚为低电平时准备好要传送的数据， 然后再将时钟设为高电平。在设置时钟和数据引脚 之间用udelay 函数进行短暂延时1us。 write_gpio_bit(GPIO_L3MODE, 1); udelay(1); 在地址模式下数据传送完成后， 则设置GPIO_L3MODE 引脚为高电平，准备进入数据传输 模式，并短暂延时1us。 local_irq_restore(flags); 最后调用该 宏函数来恢复IRQ 和FIQ 的中断使能状态。 */ for (i = 0; i < 8; i++) { if (data & 0x1) { /* * To set Bit 4 of GPBDAT to be 0(GPIO_L3CLOCK=0x01010104) */ s3c2410_gpio_setpin(S3C2410_GPB4,0); udelay(1); /* * To set Bit 3 of GPBDAT to be 1(GPIO_L3DATA=0x01010103) */ s3c2410_gpio_setpin(S3C2410_GPB3,1); udelay(1); /* * To set Bit 4 of GPBDAT to be 1(GPIO_L3CLOCK=0x01010104) */ s3c2410_gpio_setpin(S3C2410_GPB4,1); udelay(1); } else { /* * To set Bit 4 of GPBDAT to be 0(GPIO_L3CLOCK=0x01010104) */ s3c2410_gpio_setpin(S3C2410_GPB4,0); udelay(1); /* * To set Bit 3 of GPBDAT to be 0(/GPIO_L3DATA=0x01010103) */ s3c2410_gpio_setpin(S3C2410_GPB3,0); udelay(1); /* * To set Bit 4 of GPBDAT to be 1(GPIO_L3CLOCK=0x01010104) */ s3c2410_gpio_setpin(S3C2410_GPB4,1); udelay(1); } data >>= 1; } /* * To set Bit 2 of GPBDAT to be 1(GPIO_L3MODE=0x01010102) */ s3c2410_gpio_setpin(S3C2410_GPB2,1); udelay(1); local_irq_restore(flags);}/* 在进入数据传输模式前，先要将GPIO_L3MODE 信号需要有一个低电平的脉冲，所以依次设置该引脚为高电平，低电平，高电平，这样就进入了数据传输模式。 To input the data L3 接口操作模式的数据传输模式接下来的这个步骤和uda1341_l3_address 函数一样，一位一位将数据发送出去。 write_gpio_bit(GPIO_L3MODE, 1);write_gpio_bit(GPIO_L3MODE, 0);udelay(1);write_gpio_bit(GPIO_L3MODE, 1); 最后，GPIO_L3MODE 信号同样需要有一个低电平的脉冲才表示数据传输模式结束，所以再次设置该引脚为高电平，低电平，高电平。 local_irq_restore(flags); 完成后，调用该宏函数来恢复IRQ 和FIQ 的中断使能状态。*/ ⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -