// SPDX-License-Identifier: GPL-2.0-or-later /* * ALSA driver for ATI IXP 150/200/250 AC97 modem controllers * * Copyright (c) 2004 Takashi Iwai <[email protected]> */ #include <linux/io.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/pci.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/mutex.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/info.h> #include <sound/ac97_codec.h> #include <sound/initval.h> MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; static int index = …; /* Exclude the first card */ static char *id = …; /* ID for this card */ static int ac97_clock = …; module_param(index, int, 0444); MODULE_PARM_DESC(…) …; module_param(id, charp, 0444); MODULE_PARM_DESC(…) …; module_param(ac97_clock, int, 0444); MODULE_PARM_DESC(…) …; /* just for backward compatibility */ static bool enable; module_param(enable, bool, 0444); /* */ #define ATI_REG_ISR … #define ATI_REG_ISR_MODEM_IN_XRUN … #define ATI_REG_ISR_MODEM_IN_STATUS … #define ATI_REG_ISR_MODEM_OUT1_XRUN … #define ATI_REG_ISR_MODEM_OUT1_STATUS … #define ATI_REG_ISR_MODEM_OUT2_XRUN … #define ATI_REG_ISR_MODEM_OUT2_STATUS … #define ATI_REG_ISR_MODEM_OUT3_XRUN … #define ATI_REG_ISR_MODEM_OUT3_STATUS … #define ATI_REG_ISR_PHYS_INTR … #define ATI_REG_ISR_PHYS_MISMATCH … #define ATI_REG_ISR_CODEC0_NOT_READY … #define ATI_REG_ISR_CODEC1_NOT_READY … #define ATI_REG_ISR_CODEC2_NOT_READY … #define ATI_REG_ISR_NEW_FRAME … #define ATI_REG_ISR_MODEM_GPIO_DATA … #define ATI_REG_IER … #define ATI_REG_IER_MODEM_IN_XRUN_EN … #define ATI_REG_IER_MODEM_STATUS_EN … #define ATI_REG_IER_MODEM_OUT1_XRUN_EN … #define ATI_REG_IER_MODEM_OUT2_XRUN_EN … #define ATI_REG_IER_MODEM_OUT3_XRUN_EN … #define ATI_REG_IER_PHYS_INTR_EN … #define ATI_REG_IER_PHYS_MISMATCH_EN … #define ATI_REG_IER_CODEC0_INTR_EN … #define ATI_REG_IER_CODEC1_INTR_EN … #define ATI_REG_IER_CODEC2_INTR_EN … #define ATI_REG_IER_NEW_FRAME_EN … #define ATI_REG_IER_MODEM_GPIO_DATA_EN … #define ATI_REG_IER_MODEM_SET_BUS_BUSY … #define ATI_REG_CMD … #define ATI_REG_CMD_POWERDOWN … #define ATI_REG_CMD_MODEM_RECEIVE_EN … #define ATI_REG_CMD_MODEM_SEND1_EN … #define ATI_REG_CMD_MODEM_SEND2_EN … #define ATI_REG_CMD_MODEM_SEND3_EN … #define ATI_REG_CMD_MODEM_STATUS_MEM … #define ATI_REG_CMD_MODEM_IN_DMA_EN … #define ATI_REG_CMD_MODEM_OUT_DMA1_EN … #define ATI_REG_CMD_MODEM_OUT_DMA2_EN … #define ATI_REG_CMD_MODEM_OUT_DMA3_EN … #define ATI_REG_CMD_AUDIO_PRESENT … #define ATI_REG_CMD_MODEM_GPIO_THRU_DMA … #define ATI_REG_CMD_LOOPBACK_EN … #define ATI_REG_CMD_PACKED_DIS … #define ATI_REG_CMD_BURST_EN … #define ATI_REG_CMD_PANIC_EN … #define ATI_REG_CMD_MODEM_PRESENT … #define ATI_REG_CMD_ACLINK_ACTIVE … #define ATI_REG_CMD_AC_SOFT_RESET … #define ATI_REG_CMD_AC_SYNC … #define ATI_REG_CMD_AC_RESET … #define ATI_REG_PHYS_OUT_ADDR … #define ATI_REG_PHYS_OUT_CODEC_MASK … #define ATI_REG_PHYS_OUT_RW … #define ATI_REG_PHYS_OUT_ADDR_EN … #define ATI_REG_PHYS_OUT_ADDR_SHIFT … #define ATI_REG_PHYS_OUT_DATA_SHIFT … #define ATI_REG_PHYS_IN_ADDR … #define ATI_REG_PHYS_IN_READ_FLAG … #define ATI_REG_PHYS_IN_ADDR_SHIFT … #define ATI_REG_PHYS_IN_DATA_SHIFT … #define ATI_REG_SLOTREQ … #define ATI_REG_COUNTER … #define ATI_REG_COUNTER_SLOT … #define ATI_REG_COUNTER_BITCLOCK … #define ATI_REG_IN_FIFO_THRESHOLD … #define ATI_REG_MODEM_IN_DMA_LINKPTR … #define ATI_REG_MODEM_IN_DMA_DT_START … #define ATI_REG_MODEM_IN_DMA_DT_NEXT … #define ATI_REG_MODEM_IN_DMA_DT_CUR … #define ATI_REG_MODEM_IN_DMA_DT_SIZE … #define ATI_REG_MODEM_OUT_FIFO … #define ATI_REG_MODEM_OUT1_DMA_THRESHOLD_MASK … #define ATI_REG_MODEM_OUT1_DMA_THRESHOLD_SHIFT … #define ATI_REG_MODEM_OUT_DMA1_LINKPTR … #define ATI_REG_MODEM_OUT_DMA2_LINKPTR … #define ATI_REG_MODEM_OUT_DMA3_LINKPTR … #define ATI_REG_MODEM_OUT_DMA1_DT_START … #define ATI_REG_MODEM_OUT_DMA1_DT_NEXT … #define ATI_REG_MODEM_OUT_DMA1_DT_CUR … #define ATI_REG_MODEM_OUT_DMA2_DT_START … #define ATI_REG_MODEM_OUT_DMA2_DT_NEXT … #define ATI_REG_MODEM_OUT_DMA2_DT_CUR … #define ATI_REG_MODEM_OUT_DMA3_DT_START … #define ATI_REG_MODEM_OUT_DMA3_DT_NEXT … #define ATI_REG_MODEM_OUT_DMA3_DT_CUR … #define ATI_REG_MODEM_OUT_DMA12_DT_SIZE … #define ATI_REG_MODEM_OUT_DMA3_DT_SIZE … #define ATI_REG_MODEM_OUT_FIFO_USED … #define ATI_REG_MODEM_OUT_GPIO … #define ATI_REG_MODEM_OUT_GPIO_EN … #define ATI_REG_MODEM_OUT_GPIO_DATA_SHIFT … #define ATI_REG_MODEM_IN_GPIO … #define ATI_REG_MODEM_MIRROR … #define ATI_REG_AUDIO_MIRROR … #define ATI_REG_MODEM_FIFO_FLUSH … #define ATI_REG_MODEM_FIFO_OUT1_FLUSH … #define ATI_REG_MODEM_FIFO_OUT2_FLUSH … #define ATI_REG_MODEM_FIFO_OUT3_FLUSH … #define ATI_REG_MODEM_FIFO_IN_FLUSH … /* LINKPTR */ #define ATI_REG_LINKPTR_EN … #define ATI_MAX_DESCRIPTORS … struct atiixp_modem; /* * DMA packate descriptor */ struct atiixp_dma_desc { … }; /* * stream enum */ enum { … }; /* DMAs */ enum { … }; /* AC97 pcm slots */ enum { … }; /* pcm devices */ #define NUM_ATI_CODECS … /* * constants and callbacks for each DMA type */ struct atiixp_dma_ops { … }; /* * DMA stream */ struct atiixp_dma { … }; /* * ATI IXP chip */ struct atiixp_modem { … }; /* */ static const struct pci_device_id snd_atiixp_ids[] = …; MODULE_DEVICE_TABLE(pci, snd_atiixp_ids); /* * lowlevel functions */ /* * update the bits of the given register. * return 1 if the bits changed. */ static int snd_atiixp_update_bits(struct atiixp_modem *chip, unsigned int reg, unsigned int mask, unsigned int value) { … } /* * macros for easy use */ #define atiixp_write(chip,reg,value) … #define atiixp_read(chip,reg) … #define atiixp_update(chip,reg,mask,val) … /* * handling DMA packets * * we allocate a linear buffer for the DMA, and split it to each packet. * in a future version, a scatter-gather buffer should be implemented. */ #define ATI_DESC_LIST_SIZE … /* * build packets ring for the given buffer size. * * IXP handles the buffer descriptors, which are connected as a linked * list. although we can change the list dynamically, in this version, * a static RING of buffer descriptors is used. * * the ring is built in this function, and is set up to the hardware. */ static int atiixp_build_dma_packets(struct atiixp_modem *chip, struct atiixp_dma *dma, struct snd_pcm_substream *substream, unsigned int periods, unsigned int period_bytes) { … } /* * remove the ring buffer and release it if assigned */ static void atiixp_clear_dma_packets(struct atiixp_modem *chip, struct atiixp_dma *dma, struct snd_pcm_substream *substream) { … } /* * AC97 interface */ static int snd_atiixp_acquire_codec(struct atiixp_modem *chip) { … } static unsigned short snd_atiixp_codec_read(struct atiixp_modem *chip, unsigned short codec, unsigned short reg) { … } static void snd_atiixp_codec_write(struct atiixp_modem *chip, unsigned short codec, unsigned short reg, unsigned short val) { … } static unsigned short snd_atiixp_ac97_read(struct snd_ac97 *ac97, unsigned short reg) { … } static void snd_atiixp_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val) { … } /* * reset AC link */ static int snd_atiixp_aclink_reset(struct atiixp_modem *chip) { … } static int snd_atiixp_aclink_down(struct atiixp_modem *chip) { … } /* * auto-detection of codecs * * the IXP chip can generate interrupts for the non-existing codecs. * NEW_FRAME interrupt is used to make sure that the interrupt is generated * even if all three codecs are connected. */ #define ALL_CODEC_NOT_READY … #define CODEC_CHECK_BITS … static int snd_atiixp_codec_detect(struct atiixp_modem *chip) { … } /* * enable DMA and irqs */ static int snd_atiixp_chip_start(struct atiixp_modem *chip) { … } /* * disable DMA and IRQs */ static int snd_atiixp_chip_stop(struct atiixp_modem *chip) { … } /* * PCM section */ /* * pointer callback simplly reads XXX_DMA_DT_CUR register as the current * position. when SG-buffer is implemented, the offset must be calculated * correctly... */ static snd_pcm_uframes_t snd_atiixp_pcm_pointer(struct snd_pcm_substream *substream) { … } /* * XRUN detected, and stop the PCM substream */ static void snd_atiixp_xrun_dma(struct atiixp_modem *chip, struct atiixp_dma *dma) { … } /* * the period ack. update the substream. */ static void snd_atiixp_update_dma(struct atiixp_modem *chip, struct atiixp_dma *dma) { … } /* set BUS_BUSY interrupt bit if any DMA is running */ /* call with spinlock held */ static void snd_atiixp_check_bus_busy(struct atiixp_modem *chip) { … } /* common trigger callback * calling the lowlevel callbacks in it */ static int snd_atiixp_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { … } /* * lowlevel callbacks for each DMA type * * every callback is supposed to be called in chip->reg_lock spinlock */ /* flush FIFO of analog OUT DMA */ static void atiixp_out_flush_dma(struct atiixp_modem *chip) { … } /* enable/disable analog OUT DMA */ static void atiixp_out_enable_dma(struct atiixp_modem *chip, int on) { … } /* start/stop transfer over OUT DMA */ static void atiixp_out_enable_transfer(struct atiixp_modem *chip, int on) { … } /* enable/disable analog IN DMA */ static void atiixp_in_enable_dma(struct atiixp_modem *chip, int on) { … } /* start/stop analog IN DMA */ static void atiixp_in_enable_transfer(struct atiixp_modem *chip, int on) { … } /* flush FIFO of analog IN DMA */ static void atiixp_in_flush_dma(struct atiixp_modem *chip) { … } /* set up slots and formats for analog OUT */ static int snd_atiixp_playback_prepare(struct snd_pcm_substream *substream) { … } /* set up slots and formats for analog IN */ static int snd_atiixp_capture_prepare(struct snd_pcm_substream *substream) { … } /* * hw_params - allocate the buffer and set up buffer descriptors */ static int snd_atiixp_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { … } static int snd_atiixp_pcm_hw_free(struct snd_pcm_substream *substream) { … } /* * pcm hardware definition, identical for all DMA types */ static const struct snd_pcm_hardware snd_atiixp_pcm_hw = …; static int snd_atiixp_pcm_open(struct snd_pcm_substream *substream, struct atiixp_dma *dma, int pcm_type) { … } static int snd_atiixp_pcm_close(struct snd_pcm_substream *substream, struct atiixp_dma *dma) { … } /* */ static int snd_atiixp_playback_open(struct snd_pcm_substream *substream) { … } static int snd_atiixp_playback_close(struct snd_pcm_substream *substream) { … } static int snd_atiixp_capture_open(struct snd_pcm_substream *substream) { … } static int snd_atiixp_capture_close(struct snd_pcm_substream *substream) { … } /* AC97 playback */ static const struct snd_pcm_ops snd_atiixp_playback_ops = …; /* AC97 capture */ static const struct snd_pcm_ops snd_atiixp_capture_ops = …; static const struct atiixp_dma_ops snd_atiixp_playback_dma_ops = …; static const struct atiixp_dma_ops snd_atiixp_capture_dma_ops = …; static int snd_atiixp_pcm_new(struct atiixp_modem *chip) { … } /* * interrupt handler */ static irqreturn_t snd_atiixp_interrupt(int irq, void *dev_id) { … } /* * ac97 mixer section */ static int snd_atiixp_mixer_new(struct atiixp_modem *chip, int clock) { … } /* * power management */ static int snd_atiixp_suspend(struct device *dev) { … } static int snd_atiixp_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(snd_atiixp_pm, snd_atiixp_suspend, snd_atiixp_resume); /* * proc interface for register dump */ static void snd_atiixp_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { … } static void snd_atiixp_proc_init(struct atiixp_modem *chip) { … } /* * destructor */ static void snd_atiixp_free(struct snd_card *card) { … } /* * constructor for chip instance */ static int snd_atiixp_init(struct snd_card *card, struct pci_dev *pci) { … } static int __snd_atiixp_probe(struct pci_dev *pci, const struct pci_device_id *pci_id) { … } static int snd_atiixp_probe(struct pci_dev *pci, const struct pci_device_id *pci_id) { … } static struct pci_driver atiixp_modem_driver = …; module_pci_driver(…) …;
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