diff options
Diffstat (limited to 'sys/arch/amd64')
| -rw-r--r-- | sys/arch/amd64/amd64/bus_machdep.c | 74 | ||||
| -rw-r--r-- | sys/arch/amd64/pci/pci_resource.c | 159 |
2 files changed, 233 insertions, 0 deletions
diff --git a/sys/arch/amd64/amd64/bus_machdep.c b/sys/arch/amd64/amd64/bus_machdep.c index d542821..89ef317 100644 --- a/sys/arch/amd64/amd64/bus_machdep.c +++ b/sys/arch/amd64/amd64/bus_machdep.c @@ -34,6 +34,52 @@ #include <vm/vm.h> #include <vm/map.h> #include <vm/pmap.h> +#include <vm/dynalloc.h> +#include <dev/pci/resource.h> +#include <string.h> + +#define BUS_PCI "PCI" +#define BUS_LPC "LPC" + +/* + * Set bus specific fields + * + * @brp: Bus resource pointer. + * @type: Bus name/signature + * + * XXX: Assumes brp->base has already been set to + * a valid bus address. + */ +static int +bus_set(struct bus_resource *brp, const char *type) +{ + struct bus_op *io = &brp->io; + + switch (*type) { + case 'P': + if (strcmp(type, BUS_PCI) == 0) { + /* + * Bus addresses for 64-bit PCI can theoretically + * span 2^64 bytes (i.e., the full 64-bit address space) + */ + brp->dma_max = (bus_addr_t)-1; + brp->dma_min = 0; + + /* Set hooks */ + io->enable_dma = pcir_enable_dma; + io->disable_dma = pcir_disable_dma; + io->set_sem = pcir_set_sem; + io->clr_sem = pcir_clr_sem; + io->dma_alloc = pcir_dma_alloc; + io->dma_free = pcir_dma_free; + io->dma_in = pcir_dma_in; + io->dma_out = pcir_dma_out; + return 0; + } + } + + return -ENODEV; +} /* * Map a physical device address into the kernel address @@ -78,3 +124,31 @@ bus_map(bus_addr_t addr, size_t size, int flags, void **vap) *vap = (void *)va; return 0; } + +/* + * Associate a specific bus with a 'bus_resource` + * structure. + * + * @name: Signature. + */ +struct bus_resource * +bus_establish(const char *name) +{ + struct bus_resource *brp; + size_t siglen; + + siglen = strlen(name); + if (siglen > RSIG_MAX) { + return NULL; + } + + /* Allocate a new bus resource handle */ + if ((brp = dynalloc(sizeof(*brp))) == NULL) { + return NULL; + } + + memset(brp, 0, sizeof(*brp)); + memcpy(brp->signature, name, siglen); + bus_set(brp, name); + return brp; +} diff --git a/sys/arch/amd64/pci/pci_resource.c b/sys/arch/amd64/pci/pci_resource.c new file mode 100644 index 0000000..5ca597b --- /dev/null +++ b/sys/arch/amd64/pci/pci_resource.c @@ -0,0 +1,159 @@ +/* + * 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; +} |