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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/azalia_device.h>
#include <device/mmio.h>
#include <delay.h>
int azalia_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;
}
int azalia_enter_reset(u8 *base)
{
/* Set bit 0 to 0 to enter reset state (BAR + 0x8)[0] */
return azalia_set_bits(base + HDA_GCTL_REG, HDA_GCTL_CRST, 0);
}
int azalia_exit_reset(u8 *base)
{
/* Set bit 0 to 1 to exit reset state (BAR + 0x8)[0] */
return azalia_set_bits(base + HDA_GCTL_REG, HDA_GCTL_CRST, HDA_GCTL_CRST);
}
static int codec_detect(u8 *base)
{
u32 reg32;
int count;
if (azalia_exit_reset(base) < 0)
goto no_codec;
/* clear STATESTS bits (BAR + 0xe)[2:0] */
reg32 = read32(base + HDA_STATESTS_REG);
reg32 |= 7;
write32(base + HDA_STATESTS_REG, 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 + HDA_STATESTS_REG);
} while ((reg32 != 0) && --count);
/* Timeout occurred */
if (!count)
goto no_codec;
if (azalia_enter_reset(base) < 0)
goto no_codec;
if (azalia_exit_reset(base) < 0)
goto no_codec;
/* Read in Codec location (BAR + 0xe)[2..0] */
reg32 = read32(base + HDA_STATESTS_REG);
reg32 &= 0x0f;
if (!reg32)
goto no_codec;
return reg32;
no_codec:
/* Codec Not found */
/* Put HDA back in reset (BAR + 0x8) [0] */
azalia_set_bits(base + HDA_GCTL_REG, 1, 0);
printk(BIOS_DEBUG, "azalia_audio: No codec!\n");
return 0;
}
/*
* Find a specific entry within a verb table
*
* @param verb_table: verb table data
* @param verb_table_bytes: verb table size in bytes
* @param viddid: vendor/device to search for
* @param verb: pointer to entry within table
*
* Returns size of the entry within the verb table,
* Returns 0 if the entry is not found
*
* The HDA verb table is composed of dwords. A set of 4 dwords is
* grouped together to form a "jack" descriptor.
* Bits 31:28 - Codec Address
* Bits 27:20 - NID
* Bits 19:8 - Verb ID
* Bits 7:0 - Payload
*
* coreboot groups different codec verb tables into a single table
* and prefixes each with a specific header consisting of 3
* dword entries:
* 1 - Codec Vendor/Device ID
* 2 - Subsystem ID
* 3 - Number of jacks (groups of 4 dwords) for this codec
*/
u32 azalia_find_verb(const u32 *verb_table, u32 verb_table_bytes, u32 viddid, const u32 **verb)
{
int idx = 0;
while (idx < (verb_table_bytes / sizeof(u32))) {
/* Header contains the number of jacks, aka groups of 4 dwords */
u32 verb_size = 4 * verb_table[idx + 2];
if (verb_table[idx] != viddid) {
idx += verb_size + 3; // skip verb + header
continue;
}
*verb = &verb_table[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)
{
u32 reg32;
/* Use a 50 usec timeout - the Linux kernel uses the same duration */
int timeout = 25;
/* Send the verb to the codec */
reg32 = read32(base + HDA_ICII_REG);
reg32 |= HDA_ICII_BUSY | HDA_ICII_VALID;
write32(base + HDA_ICII_REG, reg32);
while (timeout--)
udelay(1);
timeout = 50;
while (timeout--) {
reg32 = read32(base + HDA_ICII_REG);
if ((reg32 & (HDA_ICII_VALID | HDA_ICII_BUSY)) == HDA_ICII_VALID)
return 0;
udelay(1);
}
return -1;
}
static int azalia_write_verb(u8 *base, u32 verb)
{
if (wait_for_ready(base) < 0)
return -1;
write32(base + HDA_IC_REG, verb);
return wait_for_valid(base);
}
int azalia_program_verb_table(u8 *base, const u32 *verbs, u32 verb_size)
{
if (!verbs)
return 0;
for (u32 i = 0; i < verb_size; i++) {
if (azalia_write_verb(base, verbs[i]) < 0)
return -1;
}
return 0;
}
static void codec_init(struct device *dev, u8 *base, int addr)
{
u32 reg32;
const u32 *verb;
u32 verb_size;
printk(BIOS_DEBUG, "azalia_audio: Initializing codec #%d\n", addr);
/* 1 */
if (wait_for_ready(base) < 0) {
printk(BIOS_DEBUG, " codec not ready.\n");
return;
}
reg32 = (addr << 28) | 0x000f0000;
write32(base + HDA_IC_REG, reg32);
if (wait_for_valid(base) < 0) {
printk(BIOS_DEBUG, " codec not valid.\n");
return;
}
/* 2 */
reg32 = read32(base + HDA_IR_REG);
printk(BIOS_DEBUG, "azalia_audio: codec viddid: %08x\n", reg32);
verb_size = azalia_find_verb(cim_verb_data, cim_verb_data_size, reg32, &verb);
if (!verb_size) {
printk(BIOS_DEBUG, "azalia_audio: No verb!\n");
return;
}
printk(BIOS_DEBUG, "azalia_audio: verb_size: %u\n", verb_size);
/* 3 */
azalia_program_verb_table(base, verb, verb_size);
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, PCI_BASE_ADDRESS_0);
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 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 = &pci_dev_ops_pci,
};
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