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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* 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 the project 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.
*/
/*
* Description: PCI(e) CAM driver
* Author: Ian Marco Moffett
*/
#include <sys/errno.h>
#include <sys/param.h>
#include <sys/cdefs.h>
#include <machine/pio.h>
#include <io/pci/pci.h>
#include <io/pci/cam.h>
#define PCI_CAM_ADDR 0xCF8
#define PCI_CAM_DATA 0xCFC
/*
* Compute the configuration space address of a specific
* device at a specific register offset
*
* @dev: Device to get address base of
* @offset: Desired register offset
*
* Returns a 32-bit PCI configuration space address
*/
static inline uint32_t
pci_conf_addr(struct pci_device *dev, uint32_t offset)
{
return BIT(31) |
(offset & ~3) |
(dev->func << 8) |
(dev->slot << 11) |
(dev->bus << 16);
}
/*
* Perform a legacy PCI CAM read which interacts
* with the lower 256 bytes of the configuration
* space. Upon receiving a write to PCI_CAM_ADDR,
* the PCI host bridge latches its PCI_CAM_DATA
* register at which written data is delegated to
* the target device.
*
* @dp: Device to read from
* @off: Register offset to read at
*
* Returns a 32-bit dword from the device register
*/
static pcireg_t
cam_readl(struct pci_device *dp, uint32_t off)
{
uint32_t conf_addr;
conf_addr = pci_conf_addr(dp, off);
outl(PCI_CAM_ADDR, conf_addr);
return inl(PCI_CAM_DATA);
}
/*
* Does the same thing as cam_readl() but for
* writing to the configuration space
*
* @dp: Target device pointer
* @off: Register offset to write at
* @v: Value to write
*/
static void
cam_writel(struct pci_device *dp, uint32_t off, pcival_t v)
{
uint32_t conf_addr;
conf_addr = pci_conf_addr(dp, off);
outl(PCI_CAM_ADDR, conf_addr);
outl(PCI_CAM_DATA, v);
}
/*
* Initialize PCI cam hooks
*/
int
pci_cam_init(struct cam_hook *chp)
{
if (chp == NULL) {
return -EINVAL;
}
chp->cam_readl = cam_readl;
chp->cam_writel = cam_writel;
return 0;
}
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