Difuse/u-boot
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

x86: apl: Allow reading hostbridge base addresses

Browse source 
Add a few functions to permit reading of various useful base addresses
provided by the hostbridge.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-09-22 12:45:17 -06:00 committed by Bin Meng
parent 540f0bae9b
commit 94c5ad2534
2 changed files with 58 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
arch/x86/cpu/apollolake/hostbridge.c
View file

@ -40,7 +40,9 @@ enum {
PCIEXBAR_PCIEXBAREN = 1 << 0,
BGSM = 0xb4, /* Base GTT Stolen Memory */
TSEG = 0xb8, /* TSEG base */
TOLUD = 0xbc,
};
static int apl_hostbridge_early_init_pinctrl(struct udevice *dev)
@ -165,6 +167,31 @@ static int apl_hostbridge_probe(struct udevice *dev)
return 0;
}
static ulong sa_read_reg(struct udevice *dev, int reg)
{
u32 val;
/* All regions concerned for have 1 MiB alignment */
dm_pci_read_config32(dev, BGSM, &val);
return ALIGN_DOWN(val, 1 << 20);
}
ulong sa_get_tolud_base(struct udevice *dev)
{
return sa_read_reg(dev, TOLUD);
}
ulong sa_get_gsm_base(struct udevice *dev)
{
return sa_read_reg(dev, BGSM);
}
ulong sa_get_tseg_base(struct udevice *dev)
{
return sa_read_reg(dev, TSEG);
}
static const struct udevice_id apl_hostbridge_ids[] = {
{ .compatible = "intel,apl-hostbridge" },
{ }

31
arch/x86/include/asm/arch-apollolake/systemagent.h
View file

@ -35,4 +35,35 @@
*/
void enable_bios_reset_cpl(void);
/**
* sa_get_tolud_base() - Get the TOLUD base address
*
* This returns the Top Of Low Useable DRAM, marking the top of usable DRAM
* below 4GB
*
* @dev: hostbridge device
* @return TOLUD address
*/
ulong sa_get_tolud_base(struct udevice *dev);
/**
* sa_get_gsm_base() - Get the GSM base address
*
* This returns the base of GTT Stolen Memory, marking the start of memory used
* for Graphics Translation Tables.
*
* @dev: hostbridge device
* @return GSM address
*/
ulong sa_get_gsm_base(struct udevice *dev);
/**
* sa_get_tseg_base() - Get the TSEG base address
*
* This returns the top address of DRAM available below 4GB
*
* @return TSEG base
*/
ulong sa_get_tseg_base(struct udevice *dev);
#endif