atl1e.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
/*
 * This driver sets the macaddress of a Atheros AR8121/AR8113/AR8114
 */
 
#include <device/mmio.h>
#include <device/device.h>
#include <cbfs.h>
#include <console/console.h>
#include <device/pci.h>
#include <device/pci_ops.h>
#include <types.h>
 
#define REG_SPI_FLASH_CTRL              0x200
#define SPI_FLASH_CTRL_EN_VPD           0x2000
 
#define REG_PCIE_CAP_LIST               0x58
 
#define REG_MAC_STA_ADDR        0x1488
 
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, "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_cbfs(u8 *macstrbuf)
{
        if (!cbfs_load("atl1e-macaddress", macstrbuf, MACLEN)) {
                printk(BIOS_ERR, "atl1e: Error reading MAC from CBFS\n");
                return CB_ERR;
        }
        return CB_SUCCESS;
}
 
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, "atl1e: 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(u32 mem_base)
{
        u8 macstrbuf[MACLEN] = { 0 };
        /* Default MAC Address of 90:e6:ba:24:f9:d2 */
        u8 mac[6] = { 0x90, 0xe6, 0xba, 0x24, 0xf9, 0xd2 };
        u32 value;
 
        if (fetch_mac_string_cbfs(macstrbuf) != CB_SUCCESS) {
                printk(BIOS_ERR, "atl1e: Error reading MAC from CBFS,"
                       " using default 90:e6:ba:24:f9:d2\n");
        } else {
                get_mac_address(mac, macstrbuf);
        }
 
        printk(BIOS_DEBUG, "atl1e: Programming MAC Address...");
 
        value = (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | (mac[5] << 0);
        write32((void *)mem_base + REG_MAC_STA_ADDR, value);
        value = (mac[0] << 8) | (mac[1] << 0);
        write32((void *)mem_base + REG_MAC_STA_ADDR + 4, value);
 
        printk(BIOS_DEBUG, "done\n");
}
 
static int atl1e_eeprom_exist(u32 mem_base)
{
        u32 value = read32((void *)mem_base + REG_SPI_FLASH_CTRL);
        if (value & SPI_FLASH_CTRL_EN_VPD) {
                value &= ~SPI_FLASH_CTRL_EN_VPD;
                write32((void *)mem_base + REG_SPI_FLASH_CTRL, value);
        }
        value = read32((void *)mem_base + REG_PCIE_CAP_LIST);
        return ((value & 0xff00) == 0x6c00) ? 1 : 0;
}
 
static void atl1e_init(struct device *dev)
{
        /* Get the resource of the NIC mmio */
        struct resource *nic_res = probe_resource(dev, PCI_BASE_ADDRESS_0);
 
        if (nic_res == NULL) {
                printk(BIOS_ERR, "atl1e: resource not found\n");
                return;
        }
 
        u32 mem_base = nic_res->base;
 
        if (!mem_base) {
                printk(BIOS_ERR, "atl1e: resource not assigned\n");
                return;
        }
 
        if (atl1e_eeprom_exist(mem_base)) {
                printk(BIOS_INFO, "atl1e NIC has SPI eeprom, not setting MAC\n");
                return;
        }
 
        /* Check if the base is invalid */
        if (!mem_base) {
                printk(BIOS_ERR, "atl1e: Error can't find MEM resource\n");
                return;
        }
        /* 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 */
        program_mac_address(mem_base);
}
 
static struct device_operations atl1e_ops  = {
        .read_resources   = pci_dev_read_resources,
        .set_resources    = pci_dev_set_resources,
        .enable_resources = pci_dev_enable_resources,
        .init             = atl1e_init,
};
 
static const struct pci_driver atl1e_driver __pci_driver = {
        .ops    = &atl1e_ops,
        .vendor = 0x1969,
        .device = 0x1026,
};
 
struct chip_operations drivers_net_ops = {
        CHIP_NAME("Atheros AR8121/AR8113/AR8114")
};