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From 8f90ec9634e7eb0a385902fe2d74af4ebc33c7c2 Mon Sep 17 00:00:00 2001
From: Damien Zammit <damien@zamaudio.com>
Date: Sat, 21 May 2016 02:24:19 +1000
Subject: [PATCH] drivers/net/r8168: Add driver for realtek nic
One thing that is vital to this patch is the MAC address setting
in case the EEPROM/efuse is unconfigured.
Linux now recognises the default MAC address on GA-G41M-ES2L which
does rely on the default bios settings for the MAC address.
Change-Id: I32e070b545b4c6369686a7087b7ff838d00764e3
Signed-off-by: Damien Zammit <damien@zamaudio.com>
---
diff --git a/src/drivers/net/Kconfig b/src/drivers/net/Kconfig
new file mode 100644
index 0000000..b4bafd2
--- /dev/null
+++ b/src/drivers/net/Kconfig
@@ -0,0 +1,5 @@
+config REALTEK_8168_RESET
+ bool "Realtek 8168 reset"
+ help
+ This forces a realtek 10ec:8168 card to reset to ensure power state
+ is correct at boot.
diff --git a/src/drivers/net/Makefile.inc b/src/drivers/net/Makefile.inc
index 9b3008d..e435d48 100644
--- a/src/drivers/net/Makefile.inc
+++ b/src/drivers/net/Makefile.inc
@@ -1,2 +1,3 @@
romstage-$(CONFIG_CONSOLE_NE2K) += ne2k.c
ramstage-$(CONFIG_CONSOLE_NE2K) += ne2k.c
+ramstage-$(CONFIG_REALTEK_8168_RESET) += r8168.c
diff --git a/src/drivers/net/r8168.c b/src/drivers/net/r8168.c
new file mode 100644
index 0000000..4301693
--- /dev/null
+++ b/src/drivers/net/r8168.c
@@ -0,0 +1,94 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Damien Zammit <damien@zamaudio.com>
+ *
+ * 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 forces the 10ec:8168 device to reset so that it goes
+ * into a proper power state, also programs a default MAC address
+ * so that if the EEPROM/efuse is unconfigured it still has a default MAC.
+ */
+
+#include <arch/io.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ops.h>
+#include <device/pci_def.h>
+#include <delay.h>
+#include <console/console.h>
+
+#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
+
+static void r8168_init(struct device *dev)
+{
+ u32 i;
+ const u8 mac[6] = { 0x00, 0xe0, 0x4c, 0x00, 0xc0, 0xb0 };
+
+ /* Get the resource of the NIC mmio */
+ struct resource *nic_res = find_resource(dev, PCI_BASE_ADDRESS_0);
+ u16 nic_port = (u16)nic_res->base;
+
+ /* Set bus master */
+ pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER
+ | PCI_COMMAND_MEMORY | PCI_COMMAND_IO);
+
+ /* Reset NIC */
+ printk(BIOS_DEBUG, "r8168: Resetting NIC...");
+ outb(CMD_REG_RESET, nic_port + CMD_REG);
+
+ i = 0;
+ /* Poll for reset, with 1s timeout */
+ while (i < NIC_TIMEOUT && (inb(nic_port + CMD_REG) & CMD_REG_RESET)) {
+ udelay(1000);
+ if (++i >= NIC_TIMEOUT)
+ printk(BIOS_DEBUG, "timeout waiting for nic to reset\n");
+ }
+ if (i < NIC_TIMEOUT)
+ printk(BIOS_DEBUG, "done\n");
+
+ /* Unlock config regs */
+ outb(CFG_9346_UNLOCK, nic_port + CFG_9346);
+
+ /* Set MAC address 00:e0:4c:00:c0:b0
+ * NB: only 4-byte write accesses allowed
+ */
+ outl(mac[4] | mac[5] << 8, nic_port + 4);
+ inl(nic_port + 4);
+
+ outl(mac[0] | mac[1] << 8 | mac[2] << 16 | mac[3] << 24, nic_port);
+ inl(nic_port);
+
+ /* Lock config regs */
+ outb(CFG_9346_LOCK, nic_port + CFG_9346);
+}
+
+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,
+};
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