| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <console/console.h> |
| #include <device/mmio.h> |
| #include <delay.h> |
| #include "pch.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)); |
| |
| /* 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; |
| } |