/* * This file is part of the coreboot project. * * Copyright (C) 2012 Google Inc. * Copyright (C) 2016 Damien Zammit * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ /* * This driver resets the 10ec:8168 NIC then tries to read * "macaddress" string XX:XX:XX:XX:XX:XX from CBFS. * If no MAC is found, it programs a default MAC address in the device * so that if the EEPROM/efuse is unconfigured it still has a default MAC. */ #include #include #include #include #include #include #include #include #include #include #define NIC_TIMEOUT 1000 #define CMD_REG 0x37 #define CMD_REG_RESET 0x10 #define CFG_9346 0x50 #define CFG_9346_LOCK 0x00 #define CFG_9346_UNLOCK 0xc0 /** * search: Find first instance of string in a given region * @param p string to find * @param a start address of region to search * @param lengthp length of string to search for * @param lengtha length of region to search in * @return offset offset from start address a where string was found. * If string not found, return lengtha. */ static size_t search(const char *p, const u8 *a, size_t lengthp, size_t lengtha) { size_t i, j; if (lengtha < lengthp) return lengtha; /* Searching */ for (j = 0; j <= lengtha - lengthp; j++) { for (i = 0; i < lengthp && p[i] == a[i + j]; i++) ; if (i >= lengthp) return j; } return lengtha; } static u8 get_hex_digit(const u8 c) { u8 ret = 0; ret = c - '0'; if (ret > 0x09) { ret = c - 'A' + 0x0a; if (ret > 0x0f) ret = c - 'a' + 0x0a; } if (ret > 0x0f) { printk(BIOS_ERR, "Error: Invalid hex digit found: " "%c - 0x%02x\n", (char)c, c); ret = 0; } return ret; } #define MACLEN 17 static enum cb_err fetch_mac_string_vpd(u8 *macstrbuf) { struct region_device rdev; void *search_address; size_t search_length; size_t offset; char key[] = "ethernet_mac"; if (fmap_locate_area_as_rdev("RO_VPD", &rdev)) { printk(BIOS_ERR, "Error: Couldn't find RO_VPD region."); return CB_ERR; } search_address = rdev_mmap_full(&rdev); if (search_address == NULL) { printk(BIOS_ERR, "LAN: VPD not found.\n"); return CB_ERR; } search_length = region_device_sz(&rdev); offset = search(key, search_address, strlen(key), search_length); if (offset == search_length) { printk(BIOS_ERR, "Error: Could not locate '%s' in VPD\n", key); return CB_ERR; } printk(BIOS_DEBUG, "Located '%s' in VPD\n", key); offset += sizeof(key); /* move to next character */ if (offset + MACLEN > search_length) { printk(BIOS_ERR, "Search result too small!\n"); return CB_ERR; } memcpy(macstrbuf, search_address + offset, MACLEN); return CB_SUCCESS; } static enum cb_err fetch_mac_string_cbfs(u8 *macstrbuf) { struct cbfsf fh; uint32_t matchraw = CBFS_TYPE_RAW; if (!cbfs_boot_locate(&fh, "rt8168-macaddress", &matchraw)) { /* check the cbfs for the mac address */ if (rdev_readat(&fh.data, macstrbuf, 0, MACLEN) != MACLEN) { printk(BIOS_ERR, "r8168: Error reading MAC from CBFS\n"); return CB_ERR; } return CB_SUCCESS; } return CB_ERR; } static void get_mac_address(u8 *macaddr, const u8 *strbuf) { size_t offset = 0; int i; if ((strbuf[2] != ':') || (strbuf[5] != ':') || (strbuf[8] != ':') || (strbuf[11] != ':') || (strbuf[14] != ':')) { printk(BIOS_ERR, "r8168: ignore invalid MAC address in cbfs\n"); return; } for (i = 0; i < 6; i++) { macaddr[i] = 0; macaddr[i] |= get_hex_digit(strbuf[offset]) << 4; macaddr[i] |= get_hex_digit(strbuf[offset + 1]); offset += 3; } } static void program_mac_address(struct device *dev, u16 io_base) { u8 macstrbuf[MACLEN] = { 0 }; int i = 0; /* Default MAC Address of 00:E0:4C:00:C0:B0 */ u8 mac[6] = { 0x00, 0xe0, 0x4c, 0x00, 0xc0, 0xb0 }; /* check the VPD for the mac address */ if (IS_ENABLED(CONFIG_RT8168_GET_MAC_FROM_VPD)) { if (fetch_mac_string_vpd(macstrbuf) != CB_SUCCESS) printk(BIOS_ERR, "r8168: mac address not found in VPD," " using default 00:e0:4c:00:c0:b0\n"); } else { if (fetch_mac_string_cbfs(macstrbuf) != CB_SUCCESS) printk(BIOS_ERR, "r8168: Error reading MAC from CBFS," " using default 00:e0:4c:00:c0:b0\n"); } get_mac_address(mac, macstrbuf); /* Reset NIC */ printk(BIOS_DEBUG, "r8168: Resetting NIC..."); outb(CMD_REG_RESET, io_base + CMD_REG); /* Poll for reset, with 1sec timeout */ while (i < NIC_TIMEOUT && (inb(io_base + CMD_REG) & CMD_REG_RESET)) { udelay(1000); if (++i >= NIC_TIMEOUT) printk(BIOS_ERR, "timeout waiting for nic to reset\n"); } if (i < NIC_TIMEOUT) printk(BIOS_DEBUG, "done\n"); printk(BIOS_DEBUG, "r8168: Programming MAC Address..."); /* Disable register protection */ outb(CFG_9346_UNLOCK, io_base + CFG_9346); /* Set MAC address: only 4-byte write accesses allowed */ outl(mac[4] | mac[5] << 8, io_base + 4); inl(io_base + 4); outl(mac[0] | mac[1] << 8 | mac[2] << 16 | mac[3] << 24, io_base); inl(io_base); /* Lock config regs */ outb(CFG_9346_LOCK, io_base + CFG_9346); printk(BIOS_DEBUG, "done\n"); } static void r8168_init(struct device *dev) { /* Get the resource of the NIC mmio */ struct resource *nic_res = find_resource(dev, PCI_BASE_ADDRESS_0); u16 io_base = (u16)nic_res->base; /* Enable but do not set bus master */ pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_MEMORY | PCI_COMMAND_IO); /* Program MAC address based on CBFS "macaddress" containing * a string AA:BB:CC:DD:EE:FF */ if (io_base) program_mac_address(dev, io_base); else printk(BIOS_ERR, "r8168: Error cant find MMIO resource\n"); } static struct device_operations r8168_ops = { .read_resources = pci_dev_read_resources, .set_resources = pci_dev_set_resources, .enable_resources = pci_dev_enable_resources, .init = r8168_init, .scan_bus = 0, }; static const struct pci_driver r8168_driver __pci_driver = { .ops = &r8168_ops, .vendor = 0x10ec, .device = 0x8168, };