/* * This file is part of the coreboot project. * * Copyright (C) 2013 DMP Electronics Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <console/console.h> #include <device/device.h> #include <device/pci.h> #include <device/pci_ops.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, .scan_bus = 0, .ops_pci = &azalia_audio_pci_ops, };