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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_GART_H
#define _ASM_X86_GART_H
#include <asm/e820/api.h>
extern void set_up_gart_resume(u32, u32);
extern int fallback_aper_order;
extern int fallback_aper_force;
extern int fix_aperture;
/* PTE bits. */
#define GPTE_VALID 1
#define GPTE_COHERENT 2
/* Aperture control register bits. */
#define GARTEN (1<<0)
#define DISGARTCPU (1<<4)
#define DISGARTIO (1<<5)
#define DISTLBWALKPRB (1<<6)
/* GART cache control register bits. */
#define INVGART (1<<0)
#define GARTPTEERR (1<<1)
/* K8 On-cpu GART registers */
#define AMD64_GARTAPERTURECTL 0x90
#define AMD64_GARTAPERTUREBASE 0x94
#define AMD64_GARTTABLEBASE 0x98
#define AMD64_GARTCACHECTL 0x9c
#ifdef CONFIG_GART_IOMMU
extern int gart_iommu_aperture;
extern int gart_iommu_aperture_allowed;
extern int gart_iommu_aperture_disabled;
extern void early_gart_iommu_check(void);
extern int gart_iommu_init(void);
extern void __init gart_parse_options(char *);
extern int gart_iommu_hole_init(void);
#else
#define gart_iommu_aperture 0
#define gart_iommu_aperture_allowed 0
#define gart_iommu_aperture_disabled 1
static inline void early_gart_iommu_check(void)
{
}
static inline void gart_parse_options(char *options)
{
}
static inline int gart_iommu_hole_init(void)
{
return -ENODEV;
}
#endif
extern int agp_amd64_init(void);
static inline void gart_set_size_and_enable(struct pci_dev *dev, u32 order)
{
u32 ctl;
/*
* Don't enable translation but enable GART IO and CPU accesses.
* Also, set DISTLBWALKPRB since GART tables memory is UC.
*/
ctl = order << 1;
pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
}
static inline void enable_gart_translation(struct pci_dev *dev, u64 addr)
{
u32 tmp, ctl;
/* address of the mappings table */
addr >>= 12;
tmp = (u32) addr<<4;
tmp &= ~0xf;
pci_write_config_dword(dev, AMD64_GARTTABLEBASE, tmp);
/* Enable GART translation for this hammer. */
pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &ctl);
ctl |= GARTEN | DISTLBWALKPRB;
ctl &= ~(DISGARTCPU | DISGARTIO);
pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
}
static inline int aperture_valid(u64 aper_base, u32 aper_size, u32 min_size)
{
if (!aper_base)
return 0;
if (aper_base + aper_size > 0x100000000ULL) {
printk(KERN_INFO "Aperture beyond 4GB. Ignoring.\n");
return 0;
}
if (e820__mapped_any(aper_base, aper_base + aper_size, E820_TYPE_RAM)) {
printk(KERN_INFO "Aperture pointing to e820 RAM. Ignoring.\n");
return 0;
}
if (aper_size < min_size) {
printk(KERN_INFO "Aperture too small (%d MB) than (%d MB)\n",
aper_size>>20, min_size>>20);
return 0;
}
return 1;
}
#endif /* _ASM_X86_GART_H */