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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2010 Carl-Daniel Hailfinger
* Copyright (C) 2010 Idwer Vollering
*
* 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
*/
/*
* Datasheet:
* PCI/PCI-X Family of Gigabit Ethernet Controllers Software Developer's Manual
* 82540EP/EM, 82541xx, 82544GC/EI, 82545GM/EM, 82546GB/EB, and 82547xx
* http://download.intel.com/design/network/manuals/8254x_GBe_SDM.pdf
*/
#include <stdlib.h>
#include "flash.h"
#include "programmer.h"
#define PCI_VENDOR_ID_INTEL 0x8086
/* EEPROM/Flash Control & Data Register */
#define EECD 0x10
/* Flash Access Register */
#define FLA 0x1c
/*
* Register bits of EECD.
* Table 13-6
*
* Bit 04, 05: FWE (Flash Write Enable Control)
* 00b = not allowed
* 01b = flash writes disabled
* 10b = flash writes enabled
* 11b = not allowed
*/
#define FLASH_WRITES_DISABLED 0x10 /* FWE: 10000b */
#define FLASH_WRITES_ENABLED 0x20 /* FWE: 100000b */
/* Flash Access register bits
* Table 13-9
*/
#define FL_SCK 0
#define FL_CS 1
#define FL_SI 2
#define FL_SO 3
#define FL_REQ 4
#define FL_GNT 5
/* Currently unused */
// #define FL_BUSY 30
// #define FL_ER 31
uint8_t *nicintel_spibar;
const struct pcidev_status nics_intel_spi[] = {
{PCI_VENDOR_ID_INTEL, 0x105e, OK, "Intel", "82571EB Gigabit Ethernet Controller"},
{PCI_VENDOR_ID_INTEL, 0x1076, OK, "Intel", "82541GI Gigabit Ethernet Controller"},
{PCI_VENDOR_ID_INTEL, 0x107c, OK, "Intel", "82541PI Gigabit Ethernet Controller"},
{PCI_VENDOR_ID_INTEL, 0x10b9, OK, "Intel", "82572EI Gigabit Ethernet Controller"},
{},
};
static void nicintel_request_spibus(void)
{
uint32_t tmp;
tmp = pci_mmio_readl(nicintel_spibar + FLA);
tmp |= 1 << FL_REQ;
pci_mmio_writel(tmp, nicintel_spibar + FLA);
/* Wait until we are allowed to use the SPI bus. */
while (!(pci_mmio_readl(nicintel_spibar + FLA) & (1 << FL_GNT))) ;
}
static void nicintel_release_spibus(void)
{
uint32_t tmp;
tmp = pci_mmio_readl(nicintel_spibar + FLA);
tmp &= ~(1 << FL_REQ);
pci_mmio_writel(tmp, nicintel_spibar + FLA);
}
static void nicintel_bitbang_set_cs(int val)
{
uint32_t tmp;
tmp = pci_mmio_readl(nicintel_spibar + FLA);
tmp &= ~(1 << FL_CS);
tmp |= (val << FL_CS);
pci_mmio_writel(tmp, nicintel_spibar + FLA);
}
static void nicintel_bitbang_set_sck(int val)
{
uint32_t tmp;
tmp = pci_mmio_readl(nicintel_spibar + FLA);
tmp &= ~(1 << FL_SCK);
tmp |= (val << FL_SCK);
pci_mmio_writel(tmp, nicintel_spibar + FLA);
}
static void nicintel_bitbang_set_mosi(int val)
{
uint32_t tmp;
tmp = pci_mmio_readl(nicintel_spibar + FLA);
tmp &= ~(1 << FL_SI);
tmp |= (val << FL_SI);
pci_mmio_writel(tmp, nicintel_spibar + FLA);
}
static int nicintel_bitbang_get_miso(void)
{
uint32_t tmp;
tmp = pci_mmio_readl(nicintel_spibar + FLA);
tmp = (tmp >> FL_SO) & 0x1;
return tmp;
}
static const struct bitbang_spi_master bitbang_spi_master_nicintel = {
.type = BITBANG_SPI_MASTER_NICINTEL,
.set_cs = nicintel_bitbang_set_cs,
.set_sck = nicintel_bitbang_set_sck,
.set_mosi = nicintel_bitbang_set_mosi,
.get_miso = nicintel_bitbang_get_miso,
.request_bus = nicintel_request_spibus,
.release_bus = nicintel_release_spibus,
.half_period = 1,
};
static int nicintel_spi_shutdown(void *data)
{
uint32_t tmp;
/* Disable writes manually. See the comment about EECD in
* nicintel_spi_init() for details.
*/
tmp = pci_mmio_readl(nicintel_spibar + EECD);
tmp &= ~FLASH_WRITES_ENABLED;
tmp |= FLASH_WRITES_DISABLED;
pci_mmio_writel(tmp, nicintel_spibar + EECD);
physunmap(nicintel_spibar, 4096);
pci_cleanup(pacc);
release_io_perms();
return 0;
}
int nicintel_spi_init(void)
{
uint32_t tmp;
get_io_perms();
io_base_addr = pcidev_init(PCI_BASE_ADDRESS_0, nics_intel_spi);
nicintel_spibar = physmap("Intel Gigabit NIC w/ SPI flash",
io_base_addr, 4096);
/* Automatic restore of EECD on shutdown is not possible because EECD
* does not only contain FLASH_WRITES_DISABLED|FLASH_WRITES_ENABLED,
* but other bits with side effects as well. Those other bits must be
* left untouched.
*/
tmp = pci_mmio_readl(nicintel_spibar + EECD);
tmp &= ~FLASH_WRITES_DISABLED;
tmp |= FLASH_WRITES_ENABLED;
pci_mmio_writel(tmp, nicintel_spibar + EECD);
/* test if FWE is really set to allow writes */
tmp = pci_mmio_readl(nicintel_spibar + EECD);
if ( (tmp & FLASH_WRITES_DISABLED) || !(tmp & FLASH_WRITES_ENABLED) ) {
msg_perr("Enabling flash write access failed.\n");
return 1;
}
if (register_shutdown(nicintel_spi_shutdown, NULL))
return 1;
if (bitbang_spi_init(&bitbang_spi_master_nicintel))
return 1;
return 0;
}
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