src/mainboard/siemens/mc_ehl/mainboard.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <baseboard/variants.h>
   4 #include <bootstate.h>
   5 #include <console/console.h>
   6 #include <device/device.h>
   7 #include <device/pci_def.h>
   8 #include <device/pci_ops.h>
   9 #include <device/pci_ids.h>
  10 #include <hwilib.h>
  11 #include <i210.h>
  12 #include <soc/gpio.h>
  13 #include <soc/ramstage.h>
  14 #include <string.h>
  15 #include <timer.h>
  16 #include <timestamp.h>
  17
  18 #define MAX_PATH_DEPTH          12
  19 #define MAX_NUM_MAPPINGS        10
  20
  21 /** \brief This function can decide if a given MAC address is valid or not.
  22  *         Currently, addresses filled with 0xff or 0x00 are not valid.
  23  * @param  mac  Buffer to the MAC address to check
  24  * @return 0    if address is not valid, otherwise 1
  25  */
  26 static uint8_t is_mac_adr_valid(uint8_t mac[MAC_ADDR_LEN])
  27 {
  28         for (size_t i = 0; i < MAC_ADDR_LEN; i++) {
  29                 if (mac[i] != 0x00 && mac[i] != 0xff)
  30                         return 1;
  31                 if (mac[i] != mac[0])
  32                         return 1;
  33         }
  34         return 0;
  35 }
  36
  37 /** \brief This function will search for a MAC address which can be assigned
  38  *         to a MACPHY.
  39  * @param  dev     pointer to PCI device
  40  * @param  mac     buffer where to store the MAC address
  41  * @return cb_err  CB_ERR or CB_SUCCESS
  42  */
  43 enum cb_err mainboard_get_mac_address(struct device *dev, uint8_t mac[MAC_ADDR_LEN])
  44 {
  45         struct bus *parent = dev->upstream;
  46         uint8_t buf[16], mapping[16], i = 0, chain_len = 0;
  47
  48         memset(buf, 0, sizeof(buf));
  49         memset(mapping, 0, sizeof(mapping));
  50
  51         /* The first entry in the tree is the device itself. */
  52         buf[0] = dev->path.pci.devfn;
  53         chain_len = 1;
  54         for (i = 1; i < MAX_PATH_DEPTH && parent->dev->upstream->subordinate; i++) {
  55                 buf[i] = parent->dev->path.pci.devfn;
  56                 chain_len++;
  57                 parent = parent->dev->upstream;
  58         }
  59         if (i == MAX_PATH_DEPTH) {
  60                 /* The path is deeper than MAX_PATH_DEPTH devices, error. */
  61                 printk(BIOS_ERR, "Too many bridges for %s\n", dev_path(dev));
  62                 return CB_ERR;
  63         }
  64         /*
  65          * Now construct the mapping based on the device chain starting from
  66          * root bridge device to the device itself.
  67          */
  68         mapping[0] = 1;
  69         mapping[1] = chain_len;
  70         for (i = 0; i < chain_len; i++)
  71                 mapping[i + 4] = buf[chain_len - i - 1];
  72
  73         /* Open main hwinfo block */
  74         if (hwilib_find_blocks("hwinfo.hex") != CB_SUCCESS)
  75                 return CB_ERR;
  76         /* Now try to find a valid MAC address in hwinfo for this mapping. */
  77         for (i = 0; i < MAX_NUM_MAPPINGS; i++) {
  78                 if (hwilib_get_field(XMac1Mapping + i, buf, 16) != 16)
  79                         continue;
  80                 if (memcmp(buf, mapping, chain_len + 4))
  81                         continue;
  82                 /* There is a matching mapping available, get MAC address. */
  83                 if (hwilib_get_field(XMac1 + i, mac, MAC_ADDR_LEN) == MAC_ADDR_LEN) {
  84                         if (is_mac_adr_valid(mac))
  85                                 return CB_SUCCESS;
  86                 }
  87                 return CB_ERR;
  88         }
  89         /* No MAC address found for */
  90         return CB_ERR;
  91 }
  92
  93 static void wait_for_legacy_dev(void *unused)
  94 {
  95         uint32_t legacy_delay, us_since_boot;
  96         struct stopwatch sw;
  97
  98         /* Open main hwinfo block. */
  99         if (hwilib_find_blocks("hwinfo.hex") != CB_SUCCESS)
 100                 return;
 101
 102         /* Get legacy delay parameter from hwinfo. */
 103         if (hwilib_get_field(LegacyDelay, (uint8_t *)&legacy_delay,
 104                               sizeof(legacy_delay)) != sizeof(legacy_delay))
 105                 return;
 106
 107         us_since_boot = get_us_since_boot();
 108         /* No need to wait if the time since boot is already long enough.*/
 109         if (us_since_boot > legacy_delay)
 110                 return;
 111         stopwatch_init_msecs_expire(&sw, (legacy_delay - us_since_boot) / 1000);
 112         printk(BIOS_NOTICE, "Wait remaining %d of %d us for legacy devices...",
 113                         legacy_delay - us_since_boot, legacy_delay);
 114         stopwatch_wait_until_expired(&sw);
 115         printk(BIOS_NOTICE, "done!\n");
 116 }
 117
 118 void mainboard_silicon_init_params(FSP_S_CONFIG *params)
 119 {
 120         /* Disable CPU power states (C-states) */
 121         params->Cx = 0;
 122
 123         /* Set maximum package C-state to PkgC0C1 */
 124         params->PkgCStateLimit = 0;
 125
 126         /* Disable P-States */
 127         params->MaxRatio = 0;
 128
 129         /* Disable PMC low power modes */
 130         params->PmcLpmS0ixSubStateEnableMask = 0;
 131         params->PmcV1p05PhyExtFetControlEn = 0;
 132         params->PmcV1p05IsExtFetControlEn = 0;
 133 }
 134
 135 static void mainboard_init(void *chip_info)
 136 {
 137         const struct pad_config *pads;
 138         size_t num;
 139
 140         pads = variant_gpio_table(&num);
 141         gpio_configure_pads(pads, num);
 142 }
 143
 144 static void mainboard_final(void *chip_info)
 145 {
 146         struct device *dev;
 147
 148         /* Do board specific things */
 149         variant_mainboard_final();
 150
 151         if (CONFIG(PCI_ALLOW_BUS_MASTER_ANY_DEVICE)) {
 152                 /* Set Master Enable for on-board PCI devices if allowed. */
 153                 dev = dev_find_device(PCI_VID_SIEMENS, 0x403e, 0);
 154                 if (dev)
 155                         pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER);
 156
 157                 dev = dev_find_device(PCI_VID_SIEMENS, 0x403f, 0);
 158                 if (dev)
 159                         pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER);
 160         }
 161 }
 162
 163 /* The following function performs board specific things. */
 164 void __weak variant_mainboard_final(void)
 165 {
 166 }
 167
 168 struct chip_operations mainboard_ops = {
 169         .init  = mainboard_init,
 170         .final = mainboard_final
 171 };
 172
 173 BOOT_STATE_INIT_ENTRY(BS_DEV_ENUMERATE, BS_ON_ENTRY, wait_for_legacy_dev, NULL);