ac97.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 <arch/io.h>
#include <device/pci_ops.h>
#include <delay.h>
#include "i82801dx.h"
 
#define NAMBAR          0x10
#define   MASTER_VOL    0x02
#define   PAGING        0x24
#define   EXT_AUDIO     0x28
#define   FUNC_SEL      0x66
#define   INFO_IO       0x68
#define   CONNECTOR     0x6a
#define   VENDOR_ID1    0x7c
#define   VENDOR_ID2    0x7e
#define   SEC_VENDOR_ID1 0xfc
#define   SEC_VENDOR_ID2 0xfe
 
#define NABMBAR         0x14
#define   GLOB_CNT      0x2c
#define   GLOB_STA      0x30
#define   CAS           0x34
 
#define MMBAR           0x10
#define   EXT_MODEM_ID1 0x3c
#define   EXT_MODEM_ID2 0xbc
 
#define MBAR            0x14
#define   SEC_CODEC     0x40
 
/* FIXME. This table is probably mainboard specific */
static u16 ac97_function[16*2][4] = {
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
        { (1 << 5), (2 << 11), (1 << 10), (3 << 13) }
};
 
static u16 nabmbar;
static u16 nambar;
 
static int ac97_semaphore(void)
{
        int timeout;
        u8 reg8;
 
        timeout = 0xffff;
        do {
                reg8 = inb(nabmbar + CAS);
                timeout--;
        } while ((reg8 & 1) && timeout);
        if (! timeout) {
                printk(BIOS_DEBUG, "Timeout!\n");
        }
 
        return (!timeout);
}
 
static void init_cnr(void)
{
        // TODO
}
 
static void program_sigid(struct device *dev, u32 id)
{
        pci_write_config32(dev, 0x2c, id);
}
 
static void ac97_audio_init(struct device *dev)
{
        u16 reg16;
        u32 reg32;
        int i;
 
        printk(BIOS_DEBUG, "Initializing AC'97 Audio.\n");
 
        /* top 16 bits are zero, so don't read them */
        nabmbar = pci_read_config16(dev, NABMBAR) & 0xfffe;
        nambar = pci_read_config16(dev, NAMBAR) & 0xfffe;
 
        reg16 = inw(nabmbar + GLOB_CNT);
        reg16 |= (1 << 1); /* Remove AC_RESET# */
        outw(reg16, nabmbar + GLOB_CNT);
 
        /* Wait 600ms. Ouch. */
        udelay(600 * 1000);
 
        init_cnr();
 
        /* Detect Primary AC'97 Codec */
        reg32 = inl(nabmbar + GLOB_STA);
        if ((reg32 & ((1 << 28) | (1 << 9) | (1 << 8))) == 0) {
                /* Primary Codec not found */
                printk(BIOS_DEBUG, "No primary codec. Disabling AC'97 Audio.\n");
                return;
        }
 
        ac97_semaphore();
 
        /* Detect if codec is programmable */
        outw(0x8000, nambar + MASTER_VOL);
        ac97_semaphore();
        if (inw(nambar + MASTER_VOL) != 0x8000) {
                printk(BIOS_DEBUG, "Codec not programmable. Disabling AC'97 Audio.\n");
                return;
        }
 
        /* Program Vendor IDs */
        reg32 = inw(nambar + VENDOR_ID1);
        reg32 <<= 16;
        reg32 |= (u16)inw(nambar + VENDOR_ID2);
 
        program_sigid(dev, reg32);
 
        /* Is Codec AC'97 2.3 compliant? */
        reg16 = inw(nambar + EXT_AUDIO);
        /* [11:10] = 10b -> AC'97 2.3 */
        if ((reg16 & 0x0c00) != 0x0800) {
                /* No 2.3 Codec. We're done */
                return;
        }
 
        /* Select Page 1 */
        reg16 = inw(nambar + PAGING);
        reg16 &= 0xfff0;
        reg16 |= 0x0001;
        outw(reg16, nambar + PAGING);
 
        for (i = 0x0a * 2; i > 0; i--) {
                outw(i, nambar + FUNC_SEL);
 
                /* Function could not be selected. Next one */
                if (inw(nambar + FUNC_SEL) != i)
                        continue;
 
                reg16 = inw(nambar + INFO_IO);
 
                /* Function Information present? */
                if (!(reg16 & (1 << 0)))
                        continue;
 
                /* Function Information valid? */
                if (!(reg16 & (1 << 4)))
                        continue;
 
                /* Program Buffer Delay [9:5] */
                reg16 &= 0x03e0;
                reg16 |= ac97_function[i][0];
 
                /* Program Gain [15:11] */
                reg16 |= ac97_function[i][1];
 
                /* Program Inversion [10] */
                reg16 |= ac97_function[i][2];
 
                outw(reg16, nambar + INFO_IO);
 
                /* Program Connector / Jack Location */
                reg16 = inw(nambar + CONNECTOR);
                reg16 &= 0x1fff;
                reg16 |= ac97_function[i][3];
                outw(reg16, nambar + CONNECTOR);
        }
}
 
static void ac97_modem_init(struct device *dev)
{
        u16 reg16;
        u32 reg32;
        u16 mmbar, mbar;
 
        mmbar = pci_read_config16(dev, MMBAR) & 0xfffe;
        mbar = pci_read_config16(dev, MBAR) & 0xfffe;
 
        reg16 = inw(mmbar + EXT_MODEM_ID1);
        if ((reg16 & 0xc000) != 0xc000) {
                if (reg16 & (1 << 0)) {
                        reg32 = inw(mmbar + VENDOR_ID2);
                        reg32 <<= 16;
                        reg32 |= (u16)inw(mmbar + VENDOR_ID1);
                        program_sigid(dev, reg32);
                        return;
                }
        }
 
        /* Secondary codec? */
        reg16 = inw(mbar + SEC_CODEC);
        if ((reg16 & (1 << 9)) == 0)
                return;
 
        reg16 = inw(mmbar + EXT_MODEM_ID2);
        if ((reg16 & 0xc000) == 0x4000) {
                if (reg16 & (1 << 0)) {
                        reg32 = inw(mmbar + SEC_VENDOR_ID2);
                        reg32 <<= 16;
                        reg32 |= (u16)inw(mmbar + SEC_VENDOR_ID1);
                        program_sigid(dev, reg32);
                        return;
                }
        }
}
 
static struct device_operations ac97_audio_ops  = {
        .read_resources   = pci_dev_read_resources,
        .set_resources    = pci_dev_set_resources,
        .enable_resources = pci_dev_enable_resources,
        .enable           = i82801dx_enable,
        .init             = ac97_audio_init,
};
 
static struct device_operations ac97_modem_ops  = {
        .read_resources   = pci_dev_read_resources,
        .set_resources    = pci_dev_set_resources,
        .enable_resources = pci_dev_enable_resources,
        .enable           = i82801dx_enable,
        .init             = ac97_modem_init,
};
 
/* 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) */
static const struct pci_driver i82801db_ac97_audio __pci_driver = {
        .ops    = &ac97_audio_ops,
        .vendor = PCI_VID_INTEL,
        .device = PCI_DID_INTEL_82801DB_AC97_AUDIO,
};
 
static const struct pci_driver i82801db_ac97_modem __pci_driver = {
        .ops    = &ac97_modem_ops,
        .vendor = PCI_VID_INTEL,
        .device = PCI_DID_INTEL_82801DB_AC97_MODEM,
};