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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <device/azalia_device.h>
#include <device/mmio.h>
#include <delay.h>
#include "hda_verb.h"
int hda_codec_detect(u8 *base)
{
u8 reg8;
/* Set Bit 0 to 1 to exit reset state (BAR + 0x8)[0] */
if (azalia_exit_reset(base) < 0)
goto no_codec;
/* Write back the value once reset bit is set. */
write16(base + HDA_GCAP_REG, read16(base + HDA_GCAP_REG));
/* Clear the "State Change Status Register" STATESTS bits
* for each of the "SDIN Stat Change Status Flag"
*/
write8(base + HDA_STATESTS_REG, 0xf);
/* Turn off the link and poll RESET# bit until it reads back as 0 */
if (azalia_enter_reset(base) < 0)
goto no_codec;
/* Turn on the link and poll RESET# bit until it reads back as 1 */
if (azalia_exit_reset(base) < 0)
goto no_codec;
/* Read in Codec location (BAR + 0xe)[2..0]*/
reg8 = read8(base + HDA_STATESTS_REG);
reg8 &= 0x0f;
if (!reg8)
goto no_codec;
return reg8;
no_codec:
/* Codec not found, put HDA back in reset */
azalia_enter_reset(base);
printk(BIOS_DEBUG, "HDA: No codec!\n");
return 0;
}
/*
* Wait 50usec for the codec to indicate it is ready.
* No response would imply that the codec is non-operative.
*/
static int hda_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 hda_wait_for_valid(u8 *base)
{
u32 reg32;
/* Use a 50 usec timeout - the Linux kernel uses the same duration */
int timeout = 50;
/* 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--) {
reg32 = read32(base + HDA_ICII_REG);
if ((reg32 & (HDA_ICII_VALID | HDA_ICII_BUSY)) == HDA_ICII_VALID)
return 0;
udelay(1);
}
return -1;
}
int hda_codec_write(u8 *base, u32 size, const u32 *data)
{
int i;
for (i = 0; i < size; i++) {
if (hda_wait_for_ready(base) < 0)
return -1;
write32(base + HDA_IC_REG, data[i]);
if (hda_wait_for_valid(base) < 0)
return -1;
}
return 0;
}
int hda_codec_init(u8 *base, int addr, int verb_size, const u32 *verb_data)
{
const u32 *verb;
u32 reg32, size;
int rc;
printk(BIOS_DEBUG, "HDA: Initializing codec #%d\n", addr);
if (!verb_size || !verb_data) {
printk(BIOS_DEBUG, "HDA: No verb list!\n");
return -1;
}
/* 1 */
if (hda_wait_for_ready(base) < 0) {
printk(BIOS_DEBUG, " codec not ready.\n");
return -1;
}
reg32 = (addr << 28) | 0x000f0000;
write32(base + HDA_IC_REG, reg32);
if (hda_wait_for_valid(base) < 0) {
printk(BIOS_DEBUG, " codec not valid.\n");
return -1;
}
/* 2 */
reg32 = read32(base + HDA_IR_REG);
printk(BIOS_DEBUG, "HDA: codec viddid: %08x\n", reg32);
size = azalia_find_verb(verb_data, verb_size, reg32, &verb);
if (!size) {
printk(BIOS_DEBUG, "HDA: No verb table entry found\n");
return -1;
}
/* 3 */
rc = hda_codec_write(base, size, verb);
if (rc < 0)
printk(BIOS_DEBUG, "HDA: verb not loaded\n");
else
printk(BIOS_DEBUG, "HDA: verb loaded.\n");
return rc;
}
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