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/* $OpenBSD: pci_machdep.c,v 1.1 2021/05/19 19:32:25 kettenis Exp $ */
/*
* Copyright (c) 2019 Mark Kettenis <kettenis@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
void
pci_msi_enable(pci_chipset_tag_t pc, pcitag_t tag,
bus_addr_t addr, uint32_t data)
{
pcireg_t reg;
int off;
if (pci_get_capability(pc, tag, PCI_CAP_MSI, &off, ®) == 0)
panic("%s: no msi capability", __func__);
if (reg & PCI_MSI_MC_C64) {
pci_conf_write(pc, tag, off + PCI_MSI_MA, addr);
pci_conf_write(pc, tag, off + PCI_MSI_MAU32, addr >> 32);
pci_conf_write(pc, tag, off + PCI_MSI_MD64, data);
} else {
pci_conf_write(pc, tag, off + PCI_MSI_MA, addr);
pci_conf_write(pc, tag, off + PCI_MSI_MD32, data);
}
pci_conf_write(pc, tag, off, reg | PCI_MSI_MC_MSIE);
}
int
pci_msix_table_map(pci_chipset_tag_t pc, pcitag_t tag,
bus_space_tag_t memt, bus_space_handle_t *memh)
{
bus_addr_t base;
pcireg_t reg, table, type;
int bir, offset;
int off, tblsz;
if (pci_get_capability(pc, tag, PCI_CAP_MSIX, &off, ®) == 0)
panic("%s: no msix capability", __func__);
table = pci_conf_read(pc, tag, off + PCI_MSIX_TABLE);
bir = (table & PCI_MSIX_TABLE_BIR);
offset = (table & PCI_MSIX_TABLE_OFF);
tblsz = PCI_MSIX_MC_TBLSZ(reg) + 1;
bir = PCI_MAPREG_START + bir * 4;
type = pci_mapreg_type(pc, tag, bir);
if (pci_mapreg_info(pc, tag, bir, type, &base, NULL, NULL) ||
bus_space_map(memt, base + offset, tblsz * 16, 0, memh))
return -1;
return 0;
}
void
pci_msix_table_unmap(pci_chipset_tag_t pc, pcitag_t tag,
bus_space_tag_t memt, bus_space_handle_t memh)
{
pcireg_t reg;
int tblsz;
if (pci_get_capability(pc, tag, PCI_CAP_MSIX, NULL, ®) == 0)
panic("%s: no msix capability", __func__);
tblsz = PCI_MSIX_MC_TBLSZ(reg) + 1;
bus_space_unmap(memt, memh, tblsz * 16);
}
void
pci_msix_enable(pci_chipset_tag_t pc, pcitag_t tag, bus_space_tag_t memt,
int vec, bus_addr_t addr, uint32_t data)
{
bus_space_handle_t memh;
pcireg_t reg;
uint32_t ctrl;
int off;
if (pci_get_capability(pc, tag, PCI_CAP_MSIX, &off, ®) == 0)
panic("%s: no msix capability", __func__);
KASSERT(vec <= PCI_MSIX_MC_TBLSZ(reg));
if (pci_msix_table_map(pc, tag, memt, &memh))
panic("%s: cannot map registers", __func__);
bus_space_write_4(memt, memh, PCI_MSIX_MA(vec), addr);
bus_space_write_4(memt, memh, PCI_MSIX_MAU32(vec), addr >> 32);
bus_space_write_4(memt, memh, PCI_MSIX_MD(vec), data);
bus_space_barrier(memt, memh, PCI_MSIX_MA(vec), 16,
BUS_SPACE_BARRIER_WRITE);
ctrl = bus_space_read_4(memt, memh, PCI_MSIX_VC(vec));
bus_space_write_4(memt, memh, PCI_MSIX_VC(vec),
ctrl & ~PCI_MSIX_VC_MASK);
pci_msix_table_unmap(pc, tag, memt, memh);
pci_conf_write(pc, tag, off, reg | PCI_MSIX_MC_MSIXE);
}
int
_pci_intr_map_msi(struct pci_attach_args *pa, pci_intr_handle_t *ihp)
{
pci_chipset_tag_t pc = pa->pa_pc;
pcitag_t tag = pa->pa_tag;
if ((pa->pa_flags & PCI_FLAGS_MSI_ENABLED) == 0 ||
pci_get_capability(pc, tag, PCI_CAP_MSI, NULL, NULL) == 0)
return -1;
ihp->ih_pc = pa->pa_pc;
ihp->ih_tag = pa->pa_tag;
ihp->ih_type = PCI_MSI;
ihp->ih_dmat = pa->pa_dmat;
return 0;
}
int
_pci_intr_map_msix(struct pci_attach_args *pa, int vec,
pci_intr_handle_t *ihp)
{
pci_chipset_tag_t pc = pa->pa_pc;
pcitag_t tag = pa->pa_tag;
pcireg_t reg, table, type;
int bir, off;
if ((pa->pa_flags & PCI_FLAGS_MSI_ENABLED) == 0 ||
pci_get_capability(pc, tag, PCI_CAP_MSIX, &off, ®) == 0)
return -1;
if (vec > PCI_MSIX_MC_TBLSZ(reg))
return -1;
table = pci_conf_read(pc, tag, off + PCI_MSIX_TABLE);
bir = PCI_MAPREG_START + (table & PCI_MSIX_TABLE_BIR) * 4;
type = pci_mapreg_type(pc, tag, bir);
if (pci_mapreg_assign(pa, bir, type, NULL, NULL))
return -1;
ihp->ih_pc = pa->pa_pc;
ihp->ih_tag = pa->pa_tag;
ihp->ih_intrpin = vec;
ihp->ih_type = PCI_MSIX;
ihp->ih_dmat = pa->pa_dmat;
return 0;
}
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