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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/cdefs.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <dev/pci/resource.h>
#include <dev/pci/pci.h>
#include <dev/pci/pciregs.h>
// #define DEBUG 1
#define pr_trace(fmt, ...) kprintf("pci: " fmt, ##__VA_ARGS__)
#define pr_error(...) pr_trace(__VA_ARGS__)
#if defined(DEBUG)
#define pr_debug(...) pr_trace(__VA_ARGS__)
#else
#define pr_debug(...) __nothing
#endif
/*
* Enables bus mastering for a specific PCI device.
*
* @brp: Pointer to bus resource handle.
* @devp: Pointer to `pci_device' structure.
*
* XXX: If the bus resource is MMIO capable, PCI
* memory space access will become set within
* the command/status register
*/
int
pcir_enable_dma(struct bus_resource *brp, void *devp)
{
struct pci_device *dev = devp;
uint32_t tmp;
if (brp == NULL || dev == NULL) {
return -EINVAL;
}
/*
* Make sure that we are allowed to perform DMA. This
* will fail if the bus isn't DMA-capable or if DMA
* is disabled.
*/
if (!ISSET(brp->sem, BUS_DMA)) {
pr_trace("bus marked non DMA capable, DMA not enabled\n");
return -EACCES;
}
tmp = pci_readl(dev, PCIREG_CMDSTATUS);
tmp |= PCI_BUS_MASTERING;
tmp |= ISSET(brp->sem, BUS_MMIO);
pci_writel(dev, PCIREG_CMDSTATUS, tmp);
return 0;
}
/*
* Disables bus mastering for a specific PCI device.
*
* @brp: Pointer to bus resource handle.
* @devp: Pointer to `pci_device' structure.
*
* XXX: If the bus resource is not MMIO capable, PCI
* memory space access will become unset within
* the command/status register
*/
int
pcir_disable_dma(struct bus_resource *brp, void *devp)
{
struct pci_device *dev = devp;
uint32_t tmp;
if (brp == NULL || dev == NULL) {
return -EINVAL;
}
tmp = pci_readl(dev, PCIREG_CMDSTATUS);
tmp &= ~PCI_BUS_MASTERING;
tmp &= ~ISSET(brp->sem, BUS_MMIO);
pci_writel(dev, PCIREG_CMDSTATUS, tmp);
return 0;
}
int
pcir_set_sem(struct bus_resource *brp, bus_sem_t sem)
{
/*
* BUS_PIO and BUS_MMIO are two different things
* and must be mutually exclusive...
*/
if (ISSET(sem, BUS_MMIO) && ISSET(sem, BUS_PIO)) {
pr_debug("Bad semantics (sem=%x)\n", sem);
return -EINVAL;
}
brp->sem |= sem;
return 0;
}
int
pcir_clr_sem(struct bus_resource *brp, bus_sem_t sem)
{
brp->sem &= ~sem;
return 0;
}
__unused int
pcir_dma_alloc(struct bus_resource *brp, void *res)
{
return 0;
}
__unused int
pcir_dma_free(struct bus_resource *brp, void *p)
{
return 0;
}
ssize_t
pcir_dma_in(struct bus_resource *brp, void *p)
{
return 0;
}
ssize_t
pcir_dma_out(struct bus_resource *brp, void *p)
{
return 0;
}
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