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// SPDX-License-Identifier: GPL-2.0
/*
* Primary-to-Sideband Bridge
*
* Copyright 2019 Google LLC
*/
#define LOG_CATEGORY UCLASS_P2SB
#include <common.h>
#include <dm.h>
#include <dt-structs.h>
#include <log.h>
#include <p2sb.h>
#include <spl.h>
#include <asm/p2sb.h>
#include <asm/pci.h>
#include <linux/bitops.h>
#define PCH_P2SB_E0 0xe0
#define HIDE_BIT BIT(0)
/* PCI config space registers */
#define HPTC_OFFSET 0x60
#define HPTC_ADDR_ENABLE_BIT BIT(7)
/* High Performance Event Timer Configuration */
#define P2SB_HPTC 0x60
#define P2SB_HPTC_ADDRESS_ENABLE BIT(7)
/*
* ADDRESS_SELECT ENCODING_RANGE
* 0 0xfed0 0000 - 0xfed0 03ff
* 1 0xfed0 1000 - 0xfed0 13ff
* 2 0xfed0 2000 - 0xfed0 23ff
* 3 0xfed0 3000 - 0xfed0 33ff
*/
#define P2SB_HPTC_ADDRESS_SELECT_0 (0 << 0)
#define P2SB_HPTC_ADDRESS_SELECT_1 (1 << 0)
#define P2SB_HPTC_ADDRESS_SELECT_2 (2 << 0)
#define P2SB_HPTC_ADDRESS_SELECT_3 (3 << 0)
/*
* p2sb_early_init() - Enable decoding for HPET range
*
* This is needed by FSP-M which uses the High Precision Event Timer.
*
* @dev: P2SB device
* Return: 0 if OK, -ve on error
*/
static int p2sb_early_init(struct udevice *dev)
{
struct p2sb_plat *plat = dev_get_plat(dev);
pci_dev_t pdev = plat->bdf;
/*
* Enable decoding for HPET memory address range.
* HPTC_OFFSET(0x60) bit 7, when set the P2SB will decode
* the High Performance Timer memory address range
* selected by bits 1:0
*/
pci_x86_write_config(pdev, HPTC_OFFSET, HPTC_ADDR_ENABLE_BIT,
PCI_SIZE_8);
/* Enable PCR Base address in PCH */
pci_x86_write_config(pdev, PCI_BASE_ADDRESS_0, plat->mmio_base,
PCI_SIZE_32);
pci_x86_write_config(pdev, PCI_BASE_ADDRESS_1, 0, PCI_SIZE_32);
/* Enable P2SB MSE */
pci_x86_write_config(pdev, PCI_COMMAND, PCI_COMMAND_MASTER |
PCI_COMMAND_MEMORY, PCI_SIZE_8);
return 0;
}
static int p2sb_spl_init(struct udevice *dev)
{
/* Enable decoding for HPET. Needed for FSP global pointer storage */
dm_pci_write_config(dev, P2SB_HPTC, P2SB_HPTC_ADDRESS_SELECT_0 |
P2SB_HPTC_ADDRESS_ENABLE, PCI_SIZE_8);
return 0;
}
int p2sb_of_to_plat(struct udevice *dev)
{
struct p2sb_uc_priv *upriv = dev_get_uclass_priv(dev);
struct p2sb_plat *plat = dev_get_plat(dev);
#if CONFIG_IS_ENABLED(OF_REAL)
int ret;
u32 base[2];
ret = dev_read_u32_array(dev, "early-regs", base, ARRAY_SIZE(base));
if (ret)
return log_msg_ret("Missing/short early-regs", ret);
plat->mmio_base = base[0];
/* TPL sets up the initial BAR */
if (spl_phase() == PHASE_TPL) {
plat->bdf = pci_get_devfn(dev);
if (plat->bdf < 0)
return log_msg_ret("Cannot get p2sb PCI address",
plat->bdf);
}
upriv->mmio_base = plat->mmio_base;
#else
plat->mmio_base = plat->dtplat.early_regs[0];
plat->bdf = pci_ofplat_get_devfn(plat->dtplat.reg[0]);
upriv->mmio_base = plat->mmio_base;
#endif
return 0;
}
static int p2sb_probe(struct udevice *dev)
{
if (spl_phase() == PHASE_TPL)
return p2sb_early_init(dev);
else if (spl_phase() == PHASE_SPL)
return p2sb_spl_init(dev);
return 0;
}
static void p2sb_set_hide_bit(struct udevice *dev, bool hide)
{
dm_pci_clrset_config8(dev, PCH_P2SB_E0 + 1, HIDE_BIT,
hide ? HIDE_BIT : 0);
}
static int intel_p2sb_set_hide(struct udevice *dev, bool hide)
{
u16 vendor;
if (!CONFIG_IS_ENABLED(PCI))
return -EPERM;
p2sb_set_hide_bit(dev, hide);
dm_pci_read_config16(dev, PCI_VENDOR_ID, &vendor);
if (hide && vendor != 0xffff)
return log_msg_ret("hide", -EEXIST);
else if (!hide && vendor != PCI_VENDOR_ID_INTEL)
return log_msg_ret("unhide", -ENOMEDIUM);
return 0;
}
static int p2sb_remove(struct udevice *dev)
{
int ret;
ret = intel_p2sb_set_hide(dev, true);
if (ret)
return log_msg_ret("hide", ret);
return 0;
}
static int p2sb_child_post_bind(struct udevice *dev)
{
if (CONFIG_IS_ENABLED(OF_REAL)) {
struct p2sb_child_plat *pplat = dev_get_parent_plat(dev);
int ret;
u32 pid;
ret = dev_read_u32(dev, "intel,p2sb-port-id", &pid);
if (ret)
return ret;
pplat->pid = pid;
}
return 0;
}
static const struct p2sb_ops p2sb_ops = {
.set_hide = intel_p2sb_set_hide,
};
#if CONFIG_IS_ENABLED(OF_REAL)
static const struct udevice_id p2sb_ids[] = {
{ .compatible = "intel,p2sb" },
{ }
};
#endif
U_BOOT_DRIVER(intel_p2sb) = {
.name = "intel_p2sb",
.id = UCLASS_P2SB,
.of_match = of_match_ptr(p2sb_ids),
.probe = p2sb_probe,
.remove = p2sb_remove,
.ops = &p2sb_ops,
.of_to_plat = p2sb_of_to_plat,
.plat_auto = sizeof(struct p2sb_plat),
.per_child_plat_auto = sizeof(struct p2sb_child_plat),
.child_post_bind = p2sb_child_post_bind,
.flags = DM_FLAG_OS_PREPARE,
};
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