mainboard.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <baseboard/variants.h>
#include <bootstate.h>
#include <console/console.h>
#include <device/device.h>
#include <device/pci_def.h>
#include <device/pci_ops.h>
#include <device/pci_ids.h>
#include <hwilib.h>
#include <i210.h>
#include <soc/gpio.h>
#include <soc/ramstage.h>
#include <string.h>
#include <timer.h>
#include <timestamp.h>
 
#define MAX_PATH_DEPTH          12
#define MAX_NUM_MAPPINGS        10
 
/** \brief This function can decide if a given MAC address is valid or not.
 *         Currently, addresses filled with 0xff or 0x00 are not valid.
 * @param  mac  Buffer to the MAC address to check
 * @return 0    if address is not valid, otherwise 1
 */
static uint8_t is_mac_adr_valid(uint8_t mac[MAC_ADDR_LEN])
{
        for (size_t i = 0; i < MAC_ADDR_LEN; i++) {
                if (mac[i] != 0x00 && mac[i] != 0xff)
                        return 1;
                if (mac[i] != mac[0])
                        return 1;
        }
        return 0;
}
 
/** \brief This function will search for a MAC address which can be assigned
 *         to a MACPHY.
 * @param  dev     pointer to PCI device
 * @param  mac     buffer where to store the MAC address
 * @return cb_err  CB_ERR or CB_SUCCESS
 */
enum cb_err mainboard_get_mac_address(struct device *dev, uint8_t mac[MAC_ADDR_LEN])
{
        struct bus *parent = dev->bus;
        uint8_t buf[16], mapping[16], i = 0, chain_len = 0;
 
        memset(buf, 0, sizeof(buf));
        memset(mapping, 0, sizeof(mapping));
 
        /* The first entry in the tree is the device itself. */
        buf[0] = dev->path.pci.devfn;
        chain_len = 1;
        for (i = 1; i < MAX_PATH_DEPTH && parent->dev->bus->subordinate; i++) {
                buf[i] = parent->dev->path.pci.devfn;
                chain_len++;
                parent = parent->dev->bus;
        }
        if (i == MAX_PATH_DEPTH) {
                /* The path is deeper than MAX_PATH_DEPTH devices, error. */
                printk(BIOS_ERR, "Too many bridges for %s\n", dev_path(dev));
                return CB_ERR;
        }
        /*
         * Now construct the mapping based on the device chain starting from
         * root bridge device to the device itself.
         */
        mapping[0] = 1;
        mapping[1] = chain_len;
        for (i = 0; i < chain_len; i++)
                mapping[i + 4] = buf[chain_len - i - 1];
 
        /* Open main hwinfo block */
        if (hwilib_find_blocks("hwinfo.hex") != CB_SUCCESS)
                return CB_ERR;
        /* Now try to find a valid MAC address in hwinfo for this mapping. */
        for (i = 0; i < MAX_NUM_MAPPINGS; i++) {
                if (hwilib_get_field(XMac1Mapping + i, buf, 16) != 16)
                        continue;
                if (memcmp(buf, mapping, chain_len + 4))
                        continue;
                /* There is a matching mapping available, get MAC address. */
                if (hwilib_get_field(XMac1 + i, mac, MAC_ADDR_LEN) == MAC_ADDR_LEN) {
                        if (is_mac_adr_valid(mac))
                                return CB_SUCCESS;
                }
                return CB_ERR;
        }
        /* No MAC address found for */
        return CB_ERR;
}
 
static void wait_for_legacy_dev(void *unused)
{
        uint32_t legacy_delay, us_since_boot;
        struct stopwatch sw;
 
        /* Open main hwinfo block. */
        if (hwilib_find_blocks("hwinfo.hex") != CB_SUCCESS)
                return;
 
        /* Get legacy delay parameter from hwinfo. */
        if (hwilib_get_field(LegacyDelay, (uint8_t *) &legacy_delay,
                              sizeof(legacy_delay)) != sizeof(legacy_delay))
                return;
 
        us_since_boot = get_us_since_boot();
        /* No need to wait if the time since boot is already long enough.*/
        if (us_since_boot > legacy_delay)
                return;
        stopwatch_init_msecs_expire(&sw, (legacy_delay - us_since_boot) / 1000);
        printk(BIOS_NOTICE, "Wait remaining %d of %d us for legacy devices...",
                        legacy_delay - us_since_boot, legacy_delay);
        stopwatch_wait_until_expired(&sw);
        printk(BIOS_NOTICE, "done!\n");
}
 
void mainboard_silicon_init_params(FSP_S_CONFIG *params)
{
        /* Disable CPU power states (C-states) */
        params->Cx = 0;
 
        /* Set maximum package C-state to PkgC0C1 */
        params->PkgCStateLimit = 0;
 
        /* Disable P-States */
        params->MaxRatio = 0;
 
        /* Disable PMC low power modes */
        params->PmcLpmS0ixSubStateEnableMask = 0;
        params->PmcV1p05PhyExtFetControlEn = 0;
        params->PmcV1p05IsExtFetControlEn = 0;
}
 
static void mainboard_init(void *chip_info)
{
        const struct pad_config *pads;
        size_t num;
 
        pads = variant_gpio_table(&num);
        gpio_configure_pads(pads, num);
}
 
static void mainboard_final(void *chip_info)
{
        struct device *dev;
 
        /* Do board specific things */
        variant_mainboard_final();
 
        if (CONFIG(PCI_ALLOW_BUS_MASTER_ANY_DEVICE)) {
                /* Set Master Enable for on-board PCI devices if allowed. */
                dev = dev_find_device(PCI_VID_SIEMENS, 0x403e, 0);
                if (dev)
                        pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER);
 
                dev = dev_find_device(PCI_VID_SIEMENS, 0x403f, 0);
                if (dev)
                        pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER);
        }
}
 
/* The following function performs board specific things. */
void __weak variant_mainboard_final(void)
{
}
 
struct chip_operations mainboard_ops = {
        .init  = mainboard_init,
        .final = mainboard_final
};
 
BOOT_STATE_INIT_ENTRY(BS_DEV_ENUMERATE, BS_ON_ENTRY, wait_for_legacy_dev, NULL);