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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/azalia_device.h>
#include <device/mmio.h>
#include <delay.h>
#define HDA_ICII_REG 0x68
#define HDA_ICII_BUSY (1 << 0)
#define HDA_ICII_VALID (1 << 1)
static int set_bits(void *port, u32 mask, u32 val)
{
u32 reg32;
int count;
/* Write (val & mask) to port */
val &= mask;
reg32 = read32(port);
reg32 &= ~mask;
reg32 |= val;
write32(port, reg32);
/* Wait for readback of register to
* match what was just written to it
*/
count = 50;
do {
/* Wait 1ms based on BKDG wait time */
mdelay(1);
reg32 = read32(port);
reg32 &= mask;
} while ((reg32 != val) && --count);
/* Timeout occurred */
if (!count)
return -1;
return 0;
}
static int codec_detect(u8 *base)
{
u32 reg32;
int count;
/* Set Bit 0 to 1 to exit reset state (BAR + 0x8)[0] */
if (set_bits(base + 0x08, 1, 1) == -1)
goto no_codec;
/* clear STATESTS bits (BAR + 0xE)[2:0] */
reg32 = read32(base + 0x0E);
reg32 |= 7;
write32(base + 0x0E, reg32);
/* Wait for readback of register to
* match what was just written to it
*/
count = 50;
do {
/* Wait 1ms based on BKDG wait time */
mdelay(1);
reg32 = read32(base + 0x0E);
} while ((reg32 != 0) && --count);
/* Timeout occurred */
if (!count)
goto no_codec;
/* Set Bit0 to 0 to enter reset state (BAR + 0x8)[0] */
if (set_bits(base + 0x08, 1, 0) == -1)
goto no_codec;
/* Set Bit 0 to 1 to exit reset state (BAR + 0x8)[0] */
if (set_bits(base + 0x08, 1, 1) == -1)
goto no_codec;
/* Read in Codec location (BAR + 0xe)[2..0] */
reg32 = read32(base + 0xe);
reg32 &= 0x0f;
if (!reg32)
goto no_codec;
return reg32;
no_codec:
/* Codec Not found */
/* Put HDA back in reset (BAR + 0x8) [0] */
set_bits(base + 0x08, 1, 0);
printk(BIOS_DEBUG, "azalia_audio: No codec!\n");
return 0;
}
static u32 find_verb(struct device *dev, u32 viddid, const u32 **verb)
{
printk(BIOS_DEBUG, "azalia_audio: dev=%s\n", dev_path(dev));
printk(BIOS_DEBUG, "azalia_audio: Reading viddid=%x\n", viddid);
int idx = 0;
while (idx < (cim_verb_data_size / sizeof(u32))) {
u32 verb_size = 4 * cim_verb_data[idx + 2]; // in u32
if (cim_verb_data[idx] != viddid) {
idx += verb_size + 3; // skip verb + header
continue;
}
*verb = &cim_verb_data[idx + 3];
return verb_size;
}
/* Not all codecs need to load another verb */
return 0;
}
/**
* Wait 50usec for the codec to indicate it is ready
* no response would imply that the codec is non-operative
*/
static int wait_for_ready(u8 *base)
{
/* Use a 50 usec timeout - the Linux kernel uses the
* same duration */
int timeout = 50;
while (timeout--) {
u32 reg32 = read32(base + HDA_ICII_REG);
if (!(reg32 & HDA_ICII_BUSY))
return 0;
udelay(1);
}
return -1;
}
/**
* Wait 50usec for the codec to indicate that it accepted
* the previous command. No response would imply that the code
* is non-operative
*/
static int wait_for_valid(u8 *base)
{
/* Use a 50 usec timeout - the Linux kernel uses the
* same duration */
int timeout = 25;
write32(base + HDA_ICII_REG,
HDA_ICII_VALID | HDA_ICII_BUSY);
while (timeout--) {
udelay(1);
}
timeout = 50;
while (timeout--) {
u32 reg32 = read32(base + HDA_ICII_REG);
if ((reg32 & (HDA_ICII_VALID | HDA_ICII_BUSY)) ==
HDA_ICII_VALID)
return 0;
udelay(1);
}
return -1;
}
static void codec_init(struct device *dev, u8 *base, int addr)
{
u32 reg32;
const u32 *verb;
u32 verb_size;
int i;
printk(BIOS_DEBUG, "azalia_audio: Initializing codec #%d\n", addr);
/* 1 */
if (wait_for_ready(base) == -1)
return;
reg32 = (addr << 28) | 0x000f0000;
write32(base + 0x60, reg32);
if (wait_for_valid(base) == -1)
return;
reg32 = read32(base + 0x64);
/* 2 */
printk(BIOS_DEBUG, "azalia_audio: codec viddid: %08x\n", reg32);
verb_size = find_verb(dev, reg32, &verb);
if (!verb_size) {
printk(BIOS_DEBUG, "azalia_audio: No verb!\n");
return;
}
printk(BIOS_DEBUG, "azalia_audio: verb_size: %d\n", verb_size);
/* 3 */
for (i = 0; i < verb_size; i++) {
if (wait_for_ready(base) == -1)
return;
write32(base + 0x60, verb[i]);
if (wait_for_valid(base) == -1)
return;
}
printk(BIOS_DEBUG, "azalia_audio: verb loaded.\n");
}
static void codecs_init(struct device *dev, u8 *base, u32 codec_mask)
{
int i;
for (i = 2; i >= 0; i--) {
if (codec_mask & (1 << i))
codec_init(dev, base, i);
}
}
void azalia_audio_init(struct device *dev)
{
u8 *base;
struct resource *res;
u32 codec_mask;
res = find_resource(dev, 0x10);
if (!res)
return;
// NOTE this will break as soon as the azalia_audio get's a bar above
// 4G. Is there anything we can do about it?
base = res2mmio(res, 0, 0);
printk(BIOS_DEBUG, "azalia_audio: base = %p\n", base);
codec_mask = codec_detect(base);
if (codec_mask) {
printk(BIOS_DEBUG, "azalia_audio: codec_mask = %02x\n",
codec_mask);
codecs_init(dev, base, codec_mask);
}
}
struct pci_operations azalia_audio_pci_ops = {
.set_subsystem = pci_dev_set_subsystem,
};
struct device_operations default_azalia_audio_ops = {
.read_resources = pci_dev_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = azalia_audio_init,
.ops_pci = &azalia_audio_pci_ops,
};
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