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/*
* Copyright (c) 2023-2024 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/param.h>
#include <sys/errno.h>
#include <sys/mmio.h>
#include <dev/pci/pci.h>
#include <dev/pci/pciregs.h>
#include <machine/pio.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/intr.h>
#include <machine/idt.h>
/* Base address masks for BARs */
#define PCI_BAR_MEMMASK ~7
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);
}
/*
* Convert a BAR number to BAR register offset.
*
* @dev: Device of BAR to check.
* @bar: Bar number.
*/
static inline uint8_t
pci_get_barreg(struct pci_device *dev, uint8_t bar)
{
switch (bar) {
case 0: return PCIREG_BAR0;
case 1: return PCIREG_BAR1;
case 2: return PCIREG_BAR2;
case 3: return PCIREG_BAR3;
case 4: return PCIREG_BAR4;
case 5: return PCIREG_BAR5;
default: return 0;
}
}
pcireg_t
pci_readl(struct pci_device *dev, uint32_t offset)
{
uint32_t address;
address = pci_conf_addr(dev, offset);
outl(0xCF8, address);
return inl(0xCFC) >> ((offset & 3) * 8);
}
void
pci_writel(struct pci_device *dev, uint32_t offset, pcireg_t val)
{
uint32_t address;
address = pci_conf_addr(dev, offset);
outl(0xCF8, address);
outl(0xCFC, val);
}
/*
* Map a BAR into kernel memory.
*
* @dev: Device of BAR to map.
* @barno: BAR number to map.
* @vap: Resulting virtual address.
*/
int
pci_map_bar(struct pci_device *dev, uint8_t barno, void **vap)
{
uint8_t barreg = pci_get_barreg(dev, barno);
uintptr_t tmp, bar;
uint32_t size;
if (barreg == 0)
return -EINVAL;
/*
* Get the length of the region this BAR covers by writing a
* mask of 32 bits into the BAR register and seeing how many
* bits are unset. We can use this to compute the size of the
* region. We know that log2(len) bits must be unset.
*/
tmp = pci_readl(dev, barreg);
pci_writel(dev, barreg, 0xFFFFFFFF);
size = pci_readl(dev, barreg);
size = ~size + 1;
/* Restore old value and map the BAR */
pci_writel(dev, barreg, tmp);
bar = dev->bar[barno] & PCI_BAR_MEMMASK;
return bus_map(bar, size, 0, vap);
}
/*
* Enable MSI-X for a device and allocate an
* interrupt vector.
*
* @dev: Device to enable MSI-X for.
* @intr: MSI-X interrupt descriptor.
*/
int
pci_enable_msix(struct pci_device *dev, const struct msi_intr *intr)
{
volatile uint64_t *tbl;
struct cpu_info *ci;
uint32_t data, msg_ctl;
uint64_t msg_addr, tmp;
uint16_t tbl_off;
uint8_t bir;
uint8_t vector;
if (dev->msix_capoff == 0)
return -ENOTSUP;
/* Get the data from cap offset 0x04 */
data = pci_readl(dev, (dev->msix_capoff + 0x04));
bir = data & 3;
tbl_off = data & ~3;
ci = this_cpu();
msg_addr = (0xFEE00000 | (ci->apicid << 12));
/* Calculate the start of the message table */
tbl = (void *)((dev->bar[bir] & PCI_BAR_MEMMASK) + MMIO_OFFSET);
tbl = (void *)((char *)tbl + tbl_off);
/* Get the vector and setup handler */
vector = intr_alloc_vector(intr->name, IPL_BIO);
idt_set_desc(vector, IDT_INT_GATE, ISR(intr->handler), 0);
/*
* Setup the message data at bits 95:64 of the message
* table by ORing the interrupt vector to it. We also
* unmask the interrupt with bit 1 of the vector control.
*/
tmp = mmio_read64(&tbl[1]);
tmp |= vector;
tmp &= ~BIT(32);
/* Write the message table */
mmio_write64(&tbl[0], msg_addr);
mmio_write64(&tbl[1], tmp);
/*
* Set bit 16 of message control to enable MSI-X.
* Message control lives at cap offset 0x00 in bits
* 31:16.
*/
msg_ctl = pci_readl(dev, dev->msix_capoff);
msg_ctl |= BIT(31);
pci_writel(dev, dev->msix_capoff, msg_ctl);
return 0;
}
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