119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
/**
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* @file kernel/audio/hda.c
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* @brief Driver for the Intel High Definition Audio.
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*
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* @warning This is a stub driver.
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*
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* @copyright
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2021 K. Lange
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*/
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#include <errno.h>
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#include <kernel/types.h>
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#include <kernel/string.h>
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#include <kernel/printf.h>
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#include <kernel/pci.h>
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#include <kernel/process.h>
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#include <kernel/mmu.h>
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#include <kernel/list.h>
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#include <kernel/module.h>
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#include <kernel/mod/snd.h>
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#include <kernel/arch/x86_64/ports.h>
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#include <kernel/arch/x86_64/regs.h>
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#include <kernel/arch/x86_64/irq.h>
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#if 0
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static snd_knob_t _knobs[] = {
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{
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"Master",
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SND_KNOB_MASTER
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}
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};
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static int hda_mixer_read(uint32_t knob_id, uint32_t *val);
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static int hda_mixer_write(uint32_t knob_id, uint32_t val);
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/**
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* TODO: We should generate this dynamically
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* for each card based on the ports we find.
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*/
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static snd_device_t _snd = {
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.name = "Intel HDA",
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.device = NULL,
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.playback_speed = 48000,
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.playback_format = SND_FORMAT_L16SLE,
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.knobs = _knobs,
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.num_knobs = 1,
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.mixer_read = hda_mixer_read,
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.mixer_write = hda_mixer_write,
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};
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static int hda_mixer_read(uint32_t knob_id, uint32_t *val) {
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return 0;
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}
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static int hda_mixer_write(uint32_t knob_id, uint32_t val) {
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return 0;
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}
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#endif
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static void hda_setup(uint32_t device) {
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/* Map MMIO */
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uintptr_t mmio_addr = pci_read_field(device, PCI_BAR0, 4) & 0xFFFFFFFE;
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void* mapped_mmio = mmu_map_mmio_region(mmio_addr, 0x1000 * 8); /* TODO size? */
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/* Enable bus mastering, MMIO */
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pci_write_field(device, PCI_COMMAND, 2, 0x6);
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/* Enable controller */
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((volatile uint32_t*)mapped_mmio)[2] |= 1;
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while (!(((volatile uint32_t*)mapped_mmio)[2]) & 0x1);
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printf("hda: codec bitmap: %04x\n",
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((volatile uint16_t*)mapped_mmio)[7]);
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/* Stop DMA engine */
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/* Configure DMA engine */
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/* Map space for DMA */
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/* Set up ring buffer pointers */
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/* Then do the same for the DMA response ring buffer... ? */
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}
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static void find_hda(uint32_t device, uint16_t vendorid, uint16_t deviceid, void * extra) {
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if (vendorid == 0x8086 && deviceid == 0x2668) {
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hda_setup(device);
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}
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}
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static int hda_install(int argc, char * argv[]) {
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pci_scan(&find_hda, -1, NULL);
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return 0;
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}
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static int fini(void) {
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#if 0
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snd_unregister(&_snd);
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free(_device.bdl);
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for (int i = 0; i < AC97_BDL_LEN; i++) {
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free(_device.bufs[i]);
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}
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#endif
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return 0;
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}
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struct Module metadata = {
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.name = "hda",
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.init = hda_install,
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.fini = fini,
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};
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