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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/driver.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/mmio.h>
#include <dev/phy/e1000regs.h>
#include <dev/pci/pci.h>
#include <string.h>
#define pr_trace(fmt, ...) kprintf("e1000: " fmt, ##__VA_ARGS__)
#define pr_error(...) pr_trace(__VA_ARGS__)
#define E1000_VENDOR 0x8086
#define E1000_DEVICE 0x100E
static struct pci_device *e1000;
struct e1000_nic {
union {
struct e1000_iomem *iop;
void *vap;
};
uint8_t has_eeprom : 1;
uint16_t eeprom_size;
};
/*
* Query information about any EEPROMs for diagnostic
* purposes.
*
* TODO: Some wacky older chips don't show their presence
* too easily, we could fallback to microwire / SPI
* bit banging to see if it responds to us manually
* clocking a dummy read operation in.
*/
static void
eeprom_query(struct e1000_nic *np)
{
uint32_t eecd;
uint16_t size_bits = 1024;
const char *typestr = "microwire";
struct e1000_iomem *iop = np->iop;
/*
* First we should check if there is an EEPROM
* on-board as if not, there is nothing we can do
* here.
*/
eecd = mmio_read32(&iop->eecd);
if (!ISSET(eecd, E1000_EECD_PRES)) {
return;
}
np->has_eeprom = 1;
if (ISSET(eecd, E1000_EECD_TYPE)) {
typestr = "SPI";
}
if (ISSET(eecd, E1000_EECD_SIZE)) {
size_bits = 4096;
}
np->eeprom_size = size_bits;
pr_trace("%d-bit %s EEPROM detected\n", size_bits, typestr);
}
/*
* Initialize an E1000(e) chip
*/
static int
e1000_chip_init(struct e1000_nic *np)
{
eeprom_query(np);
return 0;
}
static int
e1000_init(void)
{
struct pci_lookup lookup;
struct e1000_nic nic;
int status;
lookup.vendor_id = E1000_VENDOR;
lookup.device_id = E1000_DEVICE;
e1000 = pci_get_device(lookup, PCI_DEVICE_ID | PCI_VENDOR_ID);
if (e1000 == NULL) {
return -ENODEV;
}
memset(&nic, 0, sizeof(nic));
pr_trace("e1000 at pci%d:%x.%x.%d\n",
e1000->bus, e1000->device_id, e1000->func,
e1000->slot);
if ((status = pci_map_bar(e1000, 0, &nic.vap)) != 0) {
pr_error("failed to map BAR0\n");
return status;
}
e1000_chip_init(&nic);
return 0;
}
DRIVER_EXPORT(e1000_init);
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