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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include "chip.h"
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ops.h>
#include <device/pciexp.h>
#include <device/pci_ids.h>
#include <reg_script.h>
#include <soc/pci_devs.h>
#include <soc/pcie.h>
#include <soc/ramstage.h>
#include <soc/smm.h>
static int pll_en_off;
static uint32_t strpfusecfg;
static inline int root_port_offset(struct device *dev)
{
return PCI_FUNC(dev->path.pci.devfn);
}
static inline int is_first_port(struct device *dev)
{
return root_port_offset(dev) == PCIE_PORT1_FUNC;
}
static void pcie_init(struct device *dev)
{
printk(BIOS_SPEW, "%s/%s (%s)\n", __FILE__, __func__, dev_name(dev));
}
static const struct reg_script no_dev_behind_port[] = {
REG_PCI_OR32(PCIEALC, (1 << 26)),
REG_PCI_POLL32(PCIESTS1, 0x1f000000, (1 << 24), 50000),
REG_PCI_OR32(PHYCTL4, SQDIS),
REG_SCRIPT_END,
};
static void check_port_enabled(struct device *dev)
{
int rp_config = (strpfusecfg & LANECFG_MASK) >> LANECFG_SHIFT;
printk(BIOS_SPEW, "%s/%s (%s)\n",
__FILE__, __func__, dev_name(dev));
switch (root_port_offset(dev)) {
case PCIE_PORT1_FUNC:
/* Port 1 cannot be disabled from strapping config. */
break;
case PCIE_PORT2_FUNC:
/* Port 2 disabled in all configs but 4x1. */
if (rp_config != 0x0)
dev->enabled = 0;
break;
case PCIE_PORT3_FUNC:
/* Port 3 disabled only in 1x4 config. */
if (rp_config == 0x3)
dev->enabled = 0;
break;
case PCIE_PORT4_FUNC:
/* Port 4 disabled in 1x4 and 2x2 config. */
if (rp_config >= 0x2)
dev->enabled = 0;
break;
}
}
static void check_device_present(struct device *dev)
{
/* port1_dev will store the dev struct pointer of the PORT1 */
static struct device *port1_dev;
/*
* The SOC has 4 ROOT ports defined with MAX_ROOT_PORTS_BSW. For each port initial
* assumption is that, each port will have devices connected to it. Later we will
* scan each PORT and if the device is not attached to that port we will update
* rootports_in_use. If none of the root port is in use we will disable PORT1
* otherwise we will keep PORT1 enabled per spec. In future if the SoC has more
* number of PCIe Root ports then change MAX_ROOT_PORTS_BSW value accordingly.
*/
static uint32_t rootports_in_use = MAX_ROOT_PORTS_BSW;
printk(BIOS_SPEW, "%s/%s (%s)\n",
__FILE__, __func__, dev_name(dev));
/* Set slot implemented. */
pci_write_config32(dev, XCAP, pci_read_config32(dev, XCAP) | SI);
/* No device present. */
if (!(pci_read_config32(dev, SLCTL_SLSTS) & PDS)) {
rootports_in_use--;
printk(BIOS_DEBUG, "No PCIe device present.");
/*
* Defer PORT1 disabling for now. When we are at Last port we will check
* rootports_in_use and disable PORT1 if none of the ports have any device
* connected to it.
*/
if (!is_first_port(dev)) {
reg_script_run_on_dev(dev, no_dev_behind_port);
dev->enabled = 0;
} else
port1_dev = dev;
/*
* If none of the ROOT PORT has devices connected then disable PORT1.
* Else, keep the PORT1 enabled.
*/
if (!rootports_in_use) {
reg_script_run_on_dev(port1_dev, no_dev_behind_port);
port1_dev->enabled = 0;
southcluster_enable_dev(port1_dev);
}
} else if (!dev->enabled) {
/* Port is disabled, but device present. Disable link. */
pci_write_config32(dev, LCTL,
pci_read_config32(dev, LCTL) | LD);
}
}
static void pcie_enable(struct device *dev)
{
printk(BIOS_SPEW, "%s/%s (%s)\n", __FILE__, __func__, dev_name(dev));
if (is_first_port(dev)) {
struct soc_intel_braswell_config *config = config_of(dev);
uint32_t reg = pci_read_config32(dev, PHYCTL2_IOSFBCTL);
pll_en_off = !!(reg & PLL_OFF_EN);
strpfusecfg = pci_read_config32(dev, STRPFUSECFG);
if (config->pcie_wake_enable)
smm_southcluster_save_param(SMM_SAVE_PARAM_PCIE_WAKE_ENABLE, 1);
}
/* Check if device is enabled in strapping. */
check_port_enabled(dev);
/* Determine if device is behind port. */
check_device_present(dev);
southcluster_enable_dev(dev);
}
static struct pci_operations pcie_root_ops = {
.set_subsystem = pci_dev_set_subsystem,
};
static struct device_operations device_ops = {
.read_resources = pci_bus_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_bus_enable_resources,
.init = pcie_init,
.scan_bus = pciexp_scan_bridge,
.enable = pcie_enable,
.ops_pci = &pcie_root_ops,
};
static const unsigned short pci_device_ids[] = {
PCIE_PORT1_DEVID, PCIE_PORT2_DEVID, PCIE_PORT3_DEVID, PCIE_PORT4_DEVID,
0
};
static const struct pci_driver pcie_root_ports __pci_driver = {
.ops = &device_ops,
.vendor = PCI_VENDOR_ID_INTEL,
.devices = pci_device_ids,
};
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