drivers/intel/i210: Add new driver for Intel i210 MACPHY

Add a new driver for Intel i210 MACPHY with the goal to
update the MAC address in i210 if it is found
during PCI scan.

Change-Id: I4d4e797543a9f278fb649596f63ae8e1f285b3c3
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: http://review.coreboot.org/8404
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)

1 files changed, 243 insertions, 0 deletions

diff --git a/src/drivers/intel/i210/i210.c b/src/drivers/intel/i210/i210.c
new file mode 100644
index 0000000000..cdb76e436d
--- /dev/null
+++ b/src/drivers/intel/i210/i210.c
@@ -0,0 +1,243 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Siemens AG.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "i210.h"
+#include <device/device.h>
+#include <console/console.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include <string.h>
+#include <types.h>
+#include <delay.h>
+
+/* We need one function we can call to get a MAC address to use */
+/* This function can be coded somewhere else but must exist. */
+extern enum cb_err mainboard_get_mac_address(u16 bus, u8 devfn, u8 mac[6]);
+
+/* This is a private function to wait for a bit mask in a given register */
+/* To avoid endless loops, a time-out is implemented here. */
+static int wait_done(u32* reg, u32 mask)
+{
+	u32 timeout = I210_POLL_TIMEOUT_US;
+
+	while (!(*reg & mask)) {
+		udelay(1);
+		if (!--timeout)
+			return I210_NOT_READY;
+	}
+	return I210_SUCCESS;
+}
+
+/** \brief This function can read the configuration space of the MACPHY
+ *         For this purpose, the EEPROM interface is used. No direct access
+ *         to the flash memory will be done.
+ * @param *dev     Pointer to the PCI device of this MACPHY
+ * @param address  Address inside the flash where reading will start
+ * @param count    Number of words (16 bit values) to read
+ * @param *buffer  Pointer to the buffer where to store read data
+ * @return void    I210_NO_ERROR or an error code
+ */
+static u32 read_flash(struct device *dev, u32 address, u32 count, u16 *buffer)
+{
+	u32 bar;
+	u32 *eeprd;
+	u32 i;
+
+	/* Get the BAR to memory mapped space*/
+	bar = pci_read_config32(dev, PCI_BASE_ADDRESS_0);
+	if ((!bar) || ((address + count) > 0x40))
+		return I210_INVALID_PARAM;
+	eeprd = (u32*)(bar + I210_REG_EEREAD);
+	/* Prior to start ensure flash interface is ready by checking DONE-bit */
+	if (wait_done(eeprd, I210_DONE))
+		return I210_NOT_READY;
+
+	/*OK, interface is ready, we can use it now */
+	for (i = 0; i < count; i++) {
+		/* To start a read cycle write desired address in bits 12..2 */
+		*eeprd = ((address + i) << 2) & 0x1FFC;
+		/* Wait until read is done */
+		if (wait_done(eeprd, I210_DONE))
+			return I210_READ_ERROR;
+		/* Here, we can read back desired word in bits 31..16 */
+		buffer[i] = (*eeprd & 0xffff0000) >> 16;
+	}
+	return I210_SUCCESS;
+}
+
+/** \brief This function computes the checksum for the configuration space.
+ *         The address range for the checksum is 0x00..0x3e.
+ * @param *dev      Pointer to the PCI device of this MACPHY
+ * @param *checksum Pointer to the buffer where to store the checksum
+ * @return void     I210_NO_ERROR or an error code
+ */
+static u32 compute_checksum(struct device *dev, u16 *checksum)
+{
+	u16 eep_data[0x40];
+	u32 i;
+
+	/* First read back data to compute the checksum for */
+	if (read_flash(dev, 0, 0x3f, eep_data))
+		return I210_READ_ERROR;
+	/* The checksum is computed in that way that after summarize all the */
+	/* data from word address 0 to 0x3f the result is 0xBABA. */
+	*checksum = 0;
+	for (i = 0; i < 0x3f; i++)
+		*checksum += eep_data[i];
+	*checksum = I210_TARGET_CHECKSUM - *checksum;
+	return I210_SUCCESS;
+}
+
+/** \brief This function can write the configuration space of the MACPHY
+ *         For this purpose, the EEPROM interface is used. No direct access
+ *         to the flash memory will be done. This function will update
+ *         the checksum after a value was changed.
+ * @param *dev    Pointer to the PCI device of this MACPHY
+ * @param address Address inside the flash where writing will start
+ * @param count   Number of words (16 bit values) to write
+ * @param *buffer Pointer to the buffer where data to write is stored in
+ * @return void   I210_NO_ERROR or an error code
+ */
+static u32 write_flash(struct device *dev, u32 address, u32 count, u16 *buffer)
+{
+	u32 bar;
+	u32 *eepwr;
+	u32 *eectrl;
+	u16 checksum;
+	u32 i;
+
+	/* Get the BAR to memory mapped space */
+	bar = pci_read_config32(dev, 0x10);
+	if ((!bar) || ((address + count) > 0x40))
+		return I210_INVALID_PARAM;
+	eepwr = (u32*)(bar + I210_REG_EEWRITE);
+	eectrl = (u32*)(bar + I210_REG_EECTRL);
+	/* Prior to start ensure flash interface is ready by checking DONE-bit */
+	if (wait_done(eepwr, I210_DONE))
+		return I210_NOT_READY;
+
+	/* OK, interface is ready, we can use it now */
+	for (i = 0; i < count; i++) {
+		/* To start a write cycle write desired address in bits 12..2 */
+		/* and data to write in bits 31..16 into EEWRITE-register */
+		*eepwr = ((((address + i) << 2) & 0x1FFC) | (buffer[i] << 16));
+		/* Wait until write is done */
+		if (wait_done(eepwr, I210_DONE))
+			return I210_WRITE_ERROR;
+	}
+	/* Since we have modified data, we need to update the checksum */
+	if (compute_checksum(dev, &checksum))
+		return I210_CHECKSUM_ERROR;
+	*eepwr = (0x3f << 2) | checksum << 16;
+	if (wait_done(eepwr, I210_DONE))
+		return I210_WRITE_ERROR;
+	/* Up to now, desired data was written into shadowed RAM. We now need */
+	/* to perform a flash cycle to bring the shadowed RAM into flash memory. */
+	/* To start a flash cycle we need to set FLUPD-bit and wait for FLDONE. */
+	*eectrl = *eectrl | I210_FLUPD;
+	if (wait_done(eectrl, I210_FLUDONE))
+		return I210_FLASH_UPDATE_ERROR;
+	return I210_SUCCESS;
+}
+
+/** \brief This function can read the MAC address out of the MACPHY
+ * @param *dev    Pointer to the PCI device of this MACPHY
+ * @param *MACAdr Pointer to the buffer where to store read MAC address
+ * @return void   I210_NO_ERROR or an error code
+ */
+static u32 read_mac_adr(struct device *dev, u8 *mac_adr)
+{
+	u16 adr[3];
+	if (!dev || !mac_adr)
+		return I210_INVALID_PARAM;
+	if (read_flash(dev, 0, 3, adr))
+		return I210_READ_ERROR;
+	/* Copy the address into destination. This is done because of */
+	/* possible not matching alignment for destination to u16 boundary. */
+	memcpy(mac_adr, (u8*)adr, 6);
+	return I210_SUCCESS;
+}
+
+/** \brief	This function can write the MAC address to the MACPHY
+ * @param *dev    Pointer to the PCI device of this MACPHY
+ * @param *MACAdr Pointer to the buffer where the desired MAC address is
+ * @return void   I210_NO_ERROR or an error code
+ */
+static u32 write_mac_adr(struct device *dev, u8 *mac_adr)
+{
+	u16 adr[3];
+	if (!dev || !mac_adr)
+		return I210_INVALID_PARAM;
+	/* Copy desired address into a local buffer to avoid alignment issues */
+	memcpy((u8*)adr, mac_adr, 6);
+	return write_flash(dev, 0, 3, adr);
+}
+
+/** \brief This function is the driver entry point for the init phase
+ *         of the PCI bus allocator. It will program a MAC address
+ *         into the MACPHY.
+ * @param  *dev  Pointer to the used PCI device
+ * @return void  Nothing is given back
+ */
+static void init(struct device *dev)
+{
+	u8 cur_adr[6];
+	u8 adr_to_set[6];
+	enum cb_err status;
+
+	/*Check first whether there is a valid MAC address available */
+	status = mainboard_get_mac_address(dev->bus->subordinate,
+					   dev->path.pci.devfn, adr_to_set);
+	if (status != CB_SUCCESS) {
+		printk(BIOS_ERR, "I210: No valid MAC address found\n");
+		return;
+	}
+	/* Before we will write a new address, check the existing one */
+	if (read_mac_adr(dev, cur_adr)) {
+		printk(BIOS_ERR, "I210: Not able to read MAC address.\n");
+		return;
+	}
+	if (memcmp(cur_adr, adr_to_set, 6)) {
+		if (write_mac_adr(dev, adr_to_set))
+			printk(BIOS_ERR, "I210: Error setting MAC address\n");
+		else
+			printk(BIOS_INFO, "I210: MAC address changed.\n");
+	} else {
+		printk(BIOS_INFO, "I210: MAC address is up to date.\n");
+	}
+	return;
+}
+
+static struct device_operations i210_ops  = {
+	.read_resources   = pci_dev_read_resources,
+	.set_resources    = pci_dev_set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.init             = init,
+	.scan_bus         = 0,
+	.ops_pci          = 0,
+};
+
+static const unsigned short i210_device_ids[] = { 0x1538, 0x1533, 0 };
+
+static const struct pci_driver i210_driver __pci_driver = {
+	.ops    = &i210_ops,
+	.vendor = PCI_VENDOR_ID_INTEL,
+	.devices = i210_device_ids,
+};