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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/mmio.h>
#include <delay.h>
#include "hda_verb.h"
/*
* Set bits in a register and wait for status
*/
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;
}
/*
* Probe for supported codecs
*/
int hda_codec_detect(u8 *base)
{
u8 reg8;
/* Set Bit 0 to 1 to exit reset state (BAR + 0x8)[0] */
if (set_bits(base + HDA_GCTL_REG, HDA_GCTL_CRST, HDA_GCTL_CRST) < 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 (set_bits(base + HDA_GCTL_REG, HDA_GCTL_CRST, ~HDA_GCTL_CRST) < 0)
goto no_codec;
/* Turn on the link and poll RESET# bit until it reads back as 1 */
if (set_bits(base + HDA_GCTL_REG, HDA_GCTL_CRST, HDA_GCTL_CRST) < 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 (BAR + 0x8) [0] */
set_bits(base + HDA_GCTL_REG, HDA_GCTL_CRST, 0);
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;
/* 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);
/* Use a 50 usec timeout - the Linux kernel uses the
* same duration */
int 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;
}
/*
* Find a specific entry within a verb table
*
* @param verb_table_bytes: verb table size in bytes
* @param verb_table_data: verb table data
* @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
*/
static u32 hda_find_verb(u32 verb_table_bytes,
const u32 *verb_table_data,
u32 viddid, const u32 **verb)
{
int idx = 0;
while (idx < (verb_table_bytes / sizeof(u32))) {
u32 verb_size = 4 * verb_table_data[idx+2]; // in u32
if (verb_table_data[idx] != viddid) {
idx += verb_size + 3; // skip verb + header
continue;
}
*verb = &verb_table_data[idx+3];
return verb_size;
}
/* Not all codecs need to load another verb */
return 0;
}
/*
* Write a supplied verb table
*/
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;
}
/*
* Initialize codec, then find the verb table and write it
*/
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 = hda_find_verb(verb_size, verb_data, 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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