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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 <dev/pci/pci.h>
#include <dev/ic/ahcivar.h>
#include <sys/mmio.h>
#define pr_trace(fmt, ...) kprintf("ahci: " fmt, ##__VA_ARGS__)
#define pr_error(...) pr_trace(__VA_ARGS__)
static struct pci_device *ahci_dev;
/*
* Poll for at most 1 second, to see if GHC.HR is 0.
*
* @memspace: A pointer the HBA MMIO space.
*/
static int
poll_ghc_hr(struct hba_memspace *memspace)
{
int count;
for (count = 0; count < 10000000; count++) {
if ((mmio_read32(&(memspace->ghc)) & 1) == 0) {
return 0;
}
}
return 1;
}
static int
ahci_init(void)
{
struct pci_lookup lookup;
int status;
struct ahci_hba hba;
void *abar_vap = NULL;
lookup.pci_class = 0x01;
lookup.pci_subclass = 0x06;
ahci_dev = pci_get_device(lookup, PCI_CLASS | PCI_SUBCLASS);
if (ahci_dev == NULL) {
return -ENODEV;
}
/*
* The AHCI Host Bus Adapter (HBA) connects SATA
* devices to the PCI bus, acting as an interface
* between them.
*/
pr_trace("Detected AHCI HBA (%x:%x.%x, slot=%d)\n",
ahci_dev->bus, ahci_dev->device_id, ahci_dev->func,
ahci_dev->slot);
/*
* Map the AHCI Base Address Register (ABAR) from the
* ahci_dev struct, so that we can perform MMIO and then issue
* a hard reset.
*/
if ((status = pci_map_bar(ahci_dev, 5, &abar_vap)) != 0) {
return status;
}
hba.io = (struct hba_memspace*) abar_vap;
mmio_write32(&(hba.io->ghc), mmio_read32(&(hba.io->ghc)) | 1);
if (poll_ghc_hr(hba.io) != 0) {
return 1;
}
pr_trace("Successfully performed a hard reset.\n");
return 0;
}
DRIVER_EXPORT(ahci_init);
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