azalia.c

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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/pci_ids.h>
#include <device/pci_ops.h>
#include <device/mmio.h>
#include <delay.h>
#include <device/azalia_device.h>
 
#include "chip.h"
#include "pch.h"
 
static int codec_detect(u8 *base)
{
        u8 reg8;
 
        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));
 
        /* 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, "Azalia: No codec!\n");
        return 0;
}
 
static void azalia_init(struct device *dev)
{
        u8 *base;
        struct resource *res;
        u32 codec_mask;
        u32 reg32;
 
        res = probe_resource(dev, PCI_BASE_ADDRESS_0);
        if (!res)
                return;
 
        // NOTE this will break as soon as the Azalia gets a bar above 4G.
        // Is there anything we can do about it?
        base = res2mmio(res, 0, 0);
        printk(BIOS_DEBUG, "Azalia: base = %p\n", base);
 
        if (RCBA32(CIR31) & (1 << 31)) {
                reg32 = pci_read_config32(dev, 0x120);
                reg32 &= 0xf8ffff01;
                reg32 |= (1 << 24); // 2 << 24 for server
                reg32 |= RCBA32(CIR31) & 0xfe;
                pci_write_config32(dev, 0x120, reg32);
 
                pci_or_config16(dev, 0x78, 1 << 11);
        } else
                printk(BIOS_DEBUG, "Azalia: V1CTL disabled.\n");
 
        pci_and_config32(dev, 0x114, ~0xfe);
 
        // Set VCi enable bit
        pci_or_config32(dev, 0x120, 1 << 31);
 
        // Enable HDMI codec:
        pci_or_config32(dev, 0xc4, 1 << 1);
 
        pci_or_config8(dev, 0x43, 1 << 6);
 
        /* Additional programming steps */
        pci_or_config32(dev, 0xc4, 1 << 13);
 
        pci_or_config32(dev, 0xc4, 1 << 10);
 
        pci_and_config32(dev, 0xd0, ~(1 << 31));
 
        if (dev->device == 0x1e20) {
                /* Additional step on Panther Point */
                pci_or_config32(dev, 0xc4, 1 << 17);
        }
 
        /* Set Bus Master */
        pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER);
 
        pci_write_config8(dev, 0x3c, 0x0a); // unused?
 
        /* Codec Initialization Programming Sequence */
 
        /* Take controller out of reset */
        reg32 = read32(base + HDA_GCTL_REG);
        reg32 |= HDA_GCTL_CRST;
        write32(base + HDA_GCTL_REG, reg32);
        /* Wait 1ms */
        udelay(1000);
 
        // Select Azalia mode. This needs to be controlled via devicetree.cb
        pci_or_config8(dev, 0x40, 1); // Audio Control
 
        // Docking not supported
        pci_and_config8(dev, 0x4d, (u8)~(1 << 7)); // Docking Status
 
        codec_mask = codec_detect(base);
 
        if (codec_mask) {
                printk(BIOS_DEBUG, "Azalia: codec_mask = %02x\n", codec_mask);
                azalia_codecs_init(base, codec_mask);
        }
 
        /* Enable dynamic clock gating */
        pci_update_config8(dev, 0x43, ~0x07, (1 << 2) | (1 << 0));
}
 
static const char *azalia_acpi_name(const struct device *dev)
{
        return "HDEF";
}
 
static struct device_operations azalia_ops = {
        .read_resources         = pci_dev_read_resources,
        .set_resources          = pci_dev_set_resources,
        .enable_resources       = pci_dev_enable_resources,
        .init                   = azalia_init,
        .ops_pci                = &pci_dev_ops_pci,
        .acpi_name              = azalia_acpi_name,
};
 
static const unsigned short pci_device_ids[] = { 0x1c20, 0x1e20, 0 };
 
static const struct pci_driver pch_azalia __pci_driver = {
        .ops     = &azalia_ops,
        .vendor  = PCI_VID_INTEL,
        .devices = pci_device_ids,
};