hda: stub module

apps/lspci.c

@@ -99,6 +99,7 @@ struct {
 	{0x8086, 0x1237, "PCI & Memory"},
 	{0x8086, 0x2415, "82801AA AC'97 Audio Controller"},
 	{0x8086, 0x2448, "82801 Mobile PCI Bridge"},
+	{0x8086, 0x2668, "ICH6 HD Audio Controller"},
 	{0x8086, 0x29c0, "DRAM Controller"},
 	{0x8086, 0x2918, "ICH9 LPC Interface Controller"},
 	{0x8086, 0x2922, "ICH9 6-port SATA Controller"},

modules/hda.c

@@ -0,0 +1,116 @@
+/**
+ * @file kernel/audio/hda.c
+ * @brief Driver for the Intel High Definition Audio.
+ *
+ * @copyright
+ * This file is part of ToaruOS and is released under the terms
+ * of the NCSA / University of Illinois License - see LICENSE.md
+ * Copyright (C) 2021 K. Lange
+ */
+#include <errno.h>
+#include <kernel/types.h>
+#include <kernel/string.h>
+#include <kernel/printf.h>
+#include <kernel/pci.h>
+#include <kernel/process.h>
+#include <kernel/mmu.h>
+#include <kernel/list.h>
+#include <kernel/module.h>
+#include <kernel/mod/snd.h>
+
+#include <kernel/arch/x86_64/ports.h>
+#include <kernel/arch/x86_64/regs.h>
+#include <kernel/arch/x86_64/irq.h>
+
+#if 0
+static snd_knob_t _knobs[] = {
+	{
+		"Master",
+		SND_KNOB_MASTER
+	}
+};
+
+static int hda_mixer_read(uint32_t knob_id, uint32_t *val);
+static int hda_mixer_write(uint32_t knob_id, uint32_t val);
+
+/**
+ * TODO: We should generate this dynamically
+ *       for each card based on the ports we find.
+ */
+static snd_device_t _snd = {
+	.name            = "Intel HDA",
+	.device          = NULL,
+	.playback_speed  = 48000,
+	.playback_format = SND_FORMAT_L16SLE,
+
+	.knobs     = _knobs,
+	.num_knobs = 1,
+
+	.mixer_read  = hda_mixer_read,
+	.mixer_write = hda_mixer_write,
+};
+
+static int hda_mixer_read(uint32_t knob_id, uint32_t *val) {
+	return 0;
+}
+
+static int hda_mixer_write(uint32_t knob_id, uint32_t val) {
+	return 0;
+}
+#endif
+
+static void hda_setup(uint32_t device) {
+	/* Map MMIO */
+	uintptr_t mmio_addr = pci_read_field(device, PCI_BAR0, 4) & 0xFFFFFFFE;
+	void* mapped_mmio = mmu_map_mmio_region(mmio_addr, 0x1000 * 8); /* TODO size? */
+
+	/* Enable bus mastering, MMIO */
+	pci_write_field(device, PCI_COMMAND, 2, 0x6);
+
+	/* Enable controller */
+	((volatile uint32_t*)mapped_mmio)[2] |= 1;
+	while (!(((volatile uint32_t*)mapped_mmio)[2]) & 0x1);
+
+	printf("hda: codec bitmap: %04x\n",
+		((volatile uint16_t*)mapped_mmio)[7]);
+
+	/* Stop DMA engine */
+
+	/* Configure DMA engine */
+
+	/* Map space for DMA */
+
+	/* Set up ring buffer pointers */
+
+	/* Then do the same for the DMA response ring buffer... ? */
+}
+
+static void find_hda(uint32_t device, uint16_t vendorid, uint16_t deviceid, void * extra) {
+	if (vendorid == 0x8086 && deviceid == 0x2668) {
+		hda_setup(device);
+	}
+}
+
+static int hda_install(int argc, char * argv[]) {
+	pci_scan(&find_hda, -1, NULL);
+	return 0;
+}
+
+static int fini(void) {
+	#if 0
+	snd_unregister(&_snd);
+
+	free(_device.bdl);
+	for (int i = 0; i < AC97_BDL_LEN; i++) {
+		free(_device.bufs[i]);
+	}
+	#endif
+	return 0;
+}
+
+struct Module metadata = {
+	.name = "hda",
+	.init = hda_install,
+	.fini = fini,
+};
+