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/* SPDX-License-Identifier: GPL-2.0-only */
#define __SIMPLE_DEVICE__
#include <console/console.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <intelblocks/p2sb.h>
#include <intelblocks/p2sblib.h>
#include <intelblocks/pcr.h>
#include <soc/pci_devs.h>
bool p2sb_dev_is_hidden(pci_devfn_t dev)
{
const uint16_t pci_vid = pci_read_config16(dev, PCI_VENDOR_ID);
if (pci_vid == 0xffff)
return true;
if (pci_vid == PCI_VENDOR_ID_INTEL)
return false;
printk(BIOS_ERR, "P2SB PCI_VENDOR_ID is invalid, unknown if hidden\n");
return true;
}
static void p2sb_dev_set_hide_bit(pci_devfn_t dev, int hide)
{
const uint16_t reg = P2SBC + 1;
const uint8_t mask = P2SBC_HIDE_BIT;
uint8_t val;
val = pci_read_config8(dev, reg);
val &= ~mask;
if (hide)
val |= mask;
pci_write_config8(dev, reg, val);
}
void p2sb_dev_unhide(pci_devfn_t dev)
{
p2sb_dev_set_hide_bit(dev, 0);
if (p2sb_dev_is_hidden(dev))
die_with_post_code(POST_HW_INIT_FAILURE,
"Unable to unhide the P2SB device!\n");
}
void p2sb_dev_hide(pci_devfn_t dev)
{
p2sb_dev_set_hide_bit(dev, 1);
if (!p2sb_dev_is_hidden(dev))
die_with_post_code(POST_HW_INIT_FAILURE,
"Unable to hide the P2SB device!\n");
}
static void p2sb_execute_sideband_access(pci_devfn_t dev, uint8_t cmd, uint8_t pid,
uint16_t reg, uint32_t *data)
{
struct pcr_sbi_msg msg = {
.pid = pid,
.offset = reg,
.opcode = cmd,
.is_posted = false,
.fast_byte_enable = 0xF,
.bar = 0,
.fid = 0
};
uint8_t response;
int status;
/* Unhide the P2SB device */
p2sb_dev_unhide(dev);
status = pcr_execute_sideband_msg(dev, &msg, data, &response);
if (status || response)
printk(BIOS_ERR, "Fail to execute p2sb sideband access\n");
/* Hide the P2SB device */
p2sb_dev_hide(dev);
}
uint32_t p2sb_dev_sbi_read(pci_devfn_t dev, uint8_t pid, uint16_t reg)
{
uint32_t val = 0;
p2sb_execute_sideband_access(dev, PCR_READ, pid, reg, &val);
return val;
}
void p2sb_dev_sbi_write(pci_devfn_t dev, uint8_t pid, uint16_t reg, uint32_t val)
{
p2sb_execute_sideband_access(dev, PCR_WRITE, pid, reg, &val);
}
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