igd.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <stdint.h>
#include <device/pci_ops.h>
#include <device/pci_def.h>
#include <console/console.h>
#include <option.h>
 
#include "gm45.h"
 
/* TODO: Chipset supports Protected Audio Video Path (PAVP) */
 
/* TODO: We could pass DVMT structure in GetBIOSData() SCI interface */
 
/* The PEG settings have to be set before ASPM is setup on DMI. */
static void enable_igd(const sysinfo_t *const sysinfo, const int no_peg)
{
        const pci_devfn_t mch_dev = PCI_DEV(0, 0, 0);
        const pci_devfn_t peg_dev = PCI_DEV(0, 1, 0);
        const pci_devfn_t igd_dev = PCI_DEV(0, 2, 0);
 
        printk(BIOS_DEBUG, "Enabling IGD.\n");
 
        /* HSync/VSync */
        mchbar_write8(0xbd0 + 3, 0x5a);
        mchbar_write8(0xbd0 + 4, 0x5a);
 
        static const u16 display_clock_from_f0_and_vco[][4] = {
                  /* VCO 2666    VCO 3200    VCO 4000    VCO 5333 */
                {         222,        228,        222,        222,  },
                {         333,        320,        333,        333,  },
        };
        const int f0_12 = (pci_read_config16(igd_dev, 0xf0) >> 12) & 1;
        const int vco = raminit_read_vco_index();
 
        pci_update_config16(igd_dev, 0xcc, 0xfc00, display_clock_from_f0_and_vco[f0_12][vco]);
 
        pci_update_config16(mch_dev, D0F0_GGC, 0xf00f, sysinfo->ggc);
 
        if ((sysinfo->gfx_type != GMCH_GL40) &&
                        (sysinfo->gfx_type != GMCH_GS40) &&
                        (sysinfo->gfx_type != GMCH_GL43)) {
                const u32 deven = pci_read_config32(mch_dev, D0F0_DEVEN);
                if (!(deven & 2))
                        /* Enable PEG temporarily to access D1:F0. */
                        pci_write_config32(mch_dev, D0F0_DEVEN, deven | 2);
 
                /* Some IGD related settings on D1:F0. */
                pci_and_config16(peg_dev, 0xa08, (u16)~(1 << 15));
 
                pci_or_config16(peg_dev, 0xa84, 1 << 8);
 
                pci_or_config16(peg_dev, 0xb00, (3 << 8) | (7 << 3));
 
                pci_and_config32(peg_dev, 0xb14, ~(1 << 17));
 
                if (!(deven & 2) || no_peg) {
                        /* Disable PEG finally. */
                        printk(BIOS_DEBUG, "Finally disabling "
                                           "PEG in favor of IGD.\n");
                        mchbar_setbits8(0xc14, 1 << 5 | 1 << 0);
 
                        pci_or_config32(peg_dev, 0x200, 1 << 18);
 
                        pci_or_config16(peg_dev, 0x224, 1 << 8);
 
                        pci_and_config32(peg_dev, 0x200, ~(1 << 18));
 
                        while (pci_read_config32(peg_dev, 0x214) & (0xf << 16))
                                ;
 
                        pci_write_config32(mch_dev, D0F0_DEVEN, deven & ~2);
                        mchbar_clrbits8(0xc14, 1 << 5 | 1 << 0);
                }
        }
}
 
static void disable_igd(const sysinfo_t *const sysinfo)
{
        const pci_devfn_t mch_dev = PCI_DEV(0, 0, 0);
 
        printk(BIOS_DEBUG, "Disabling IGD.\n");
 
        /* Disable Graphics Stolen Memory. */
        pci_update_config16(mch_dev, D0F0_GGC, 0xff0f, 0x0002);
 
        mchbar_setbits8(0xf10, 1 << 0);
 
        if (!(pci_read_config8(mch_dev, D0F0_CAPID0 + 4) & (1 << (33 - 32)))) {
                mchbar_setbits16(0x1190, 1 << 14);
                mchbar_clrsetbits16(0x119e, 7 << 13, 4 << 13);
                mchbar_setbits16(0x119e, 1 << 12);
        }
 
        /* Hide IGD. */
        pci_and_config32(mch_dev, D0F0_DEVEN, ~(3 << 3));
}
 
void init_igd(const sysinfo_t *const sysinfo)
{
        const pci_devfn_t mch_dev = PCI_DEV(0, 0, 0);
 
        const u8 capid = pci_read_config8(mch_dev, D0F0_CAPID0 + 4);
        if (!sysinfo->enable_igd || (capid & (1 << (33 - 32))))
                disable_igd(sysinfo);
        else
                enable_igd(sysinfo, !sysinfo->enable_peg);
}
 
void igd_compute_ggc(sysinfo_t *const sysinfo)
{
        const pci_devfn_t mch_dev = PCI_DEV(0, 0, 0);
 
        const u32 capid = pci_read_config32(mch_dev, D0F0_CAPID0 + 4);
        if (!sysinfo->enable_igd || (capid & (1 << (33 - 32))))
                sysinfo->ggc = 0x0002;
        else {
                /* 4 for 32MB, default if not set in CMOS */
                u8 gfxsize = get_uint_option("gfx_uma_size", 4);
 
                /* Graphics Stolen Memory: 2MB GTT (0x0300) when VT-d disabled,
                   2MB GTT + 2MB shadow GTT (0x0b00) else. */
 
                /* Handle invalid CMOS settings */
                /* Only allow settings between 32MB and 352MB */
                gfxsize = MIN(MAX(gfxsize, 4), 12);
 
                sysinfo->ggc = 0x0300 | ((gfxsize + 1) << 4);
                if (!(capid & (1 << (48 - 32))))
                        sysinfo->ggc |= 0x0800;
        }
}