From f3af6f252b09c952b3a4b703eeb8a1b27ab0b61d Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Wed, 20 Mar 2024 21:29:32 -0400 Subject: kernel: dev: Add PCI driver Signed-off-by: Ian Moffett --- sys/dev/pci/pci.c | 223 +++++++++++++++++++++++++++++++++++++++++++ sys/include/dev/pci/pci.h | 70 ++++++++++++++ sys/include/dev/pci/pcivar.h | 40 ++++++++ 3 files changed, 333 insertions(+) create mode 100644 sys/dev/pci/pci.c create mode 100644 sys/include/dev/pci/pci.h create mode 100644 sys/include/dev/pci/pcivar.h (limited to 'sys') diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c new file mode 100644 index 0000000..6f27200 --- /dev/null +++ b/sys/dev/pci/pci.c @@ -0,0 +1,223 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#if defined(__x86_64__) +#include +#endif +#include + +__MODULE_NAME("pci"); +__KERNEL_META("$Hyra$: pci.c, Ian Marco Moffett, " + "PCI driver core"); + +static TAILQ_HEAD(, pci_device) device_list; +static int access_method = PCI_ACCESS_CAM; + +/* + * Read device's legacy PCI CAM space + * + * @dev: Device to read. + * @offset: Offset to read at. + * + * XXX: Do not use directly! + */ +static uint32_t +pci_cam_read(const struct pci_device *dev, uint32_t offset) +{ +#if defined(__x86_64__) + uint32_t address, data; + + address = __BIT(31) | + (offset & ~3) | + (dev->func << 8) | + (dev->slot << 11) | + (dev->bus << 16); + + outl(0xCF8, address); + data = inl(0xCFC) >> ((offset & 3) * 8); + return data; +#else + panic("Invalid arch (%s())\n", __func__); +#endif +} + +static bool +pci_device_exists(uint8_t bus, uint8_t slot, uint8_t func) +{ + uint16_t vendor_id; + struct pci_device dev_tmp = { + .bus = bus, + .slot = slot, + .func = func + }; + + vendor_id = pci_cam_read(&dev_tmp, 0x0) & 0xFFFF; + + if (vendor_id == 0xFFFF) { + return false; + } + + return true; +} + +/* + * Sets other device information e.g., device id, vendor id, etc + * + * @dev: Device descriptor to set up. + * + * XXX: Expects device bus, slot and func to be set. + */ +static void +pci_set_device_info(struct pci_device *dev) +{ + dev->vendor_id = pci_readl(dev, 0x0) & 0xFFFF; + dev->device_id = pci_readl(dev, 0x0) >> 16; + dev->pci_class = pci_readl(dev, 0x8) >> 24; + + dev->pci_subclass = (pci_readl(dev, 0x8) >> 16) & 0xFF; + dev->prog_if = (pci_readl(dev, 0x8) >> 8) & 0xFF; + + dev->bar[0] = pci_readl(dev, 0x10); + dev->bar[1] = pci_readl(dev, 0x14); + dev->bar[2] = pci_readl(dev, 0x18); + dev->bar[3] = pci_readl(dev, 0x1C); + dev->bar[4] = pci_readl(dev, 0x20); + dev->bar[6] = pci_readl(dev, 0x24); + + dev->irq_line = pci_readl(dev, 0x3C) & 0xFF; +} + +static void +pci_register_device(uint8_t bus, uint8_t slot, uint8_t func) +{ + struct pci_device *dev = NULL; + + if (!pci_device_exists(bus, slot, func)) { + return; + } + + dev = dynalloc(sizeof(struct pci_device)); + __assert(dev != NULL); + + dev->bus = bus; + dev->slot = slot; + dev->func = func; + + pci_set_device_info(dev); + TAILQ_INSERT_TAIL(&device_list, dev, link); +} + +static void +pci_scan_bus(uint8_t bus) +{ + for (int slot = 0; slot < 32; ++slot) { + for (int func = 0; func < 8; ++func) { + pci_register_device(bus, slot, func); + } + } +} + +/* + * Read PCI(e) configuration space. + * + * @dev: Device to read from. + * @offset: Offset to read at. + */ +uint32_t +pci_readl(struct pci_device *dev, uint32_t offset) +{ + if (access_method == PCI_ACCESS_CAM) { + return pci_cam_read(dev, offset); + } + + panic("Invalid access method (%s())\n", __func__); + __builtin_unreachable(); +} + +struct pci_device * +pci_get_device(struct pci_lookup lookup, uint16_t lookup_type) +{ + struct pci_device *dev; + uint16_t lookup_matches = 0; + + TAILQ_FOREACH(dev, &device_list, link) { + if (__TEST(lookup_type, PCI_DEVICE_ID)) { + /* Check device ID */ + if (lookup.device_id == dev->device_id) + lookup_matches |= PCI_DEVICE_ID; + } + + if (__TEST(lookup_type, PCI_VENDOR_ID)) { + /* Check vendor ID */ + if (lookup.vendor_id == dev->vendor_id) + lookup_matches |= PCI_VENDOR_ID; + } + + if (__TEST(lookup_type, PCI_CLASS)) { + /* Check PCI class */ + if (lookup.pci_class == dev->pci_class) + lookup_matches |= PCI_CLASS; + } + + if (__TEST(lookup_type, PCI_SUBCLASS)) { + /* Check PCI class */ + if (lookup.pci_subclass == dev->pci_subclass) + lookup_matches |= PCI_SUBCLASS; + } + + if (lookup_type == lookup_matches) { + /* We found the device! */ + return dev; + } + lookup_matches = 0; + } + + return NULL; +} + +int +pci_init(void) +{ + TAILQ_INIT(&device_list); + + KINFO("Scanning each bus...\n"); + + for (uint16_t i = 0; i < 256; ++i) { + pci_scan_bus(i); + } + + return 0; +} diff --git a/sys/include/dev/pci/pci.h b/sys/include/dev/pci/pci.h new file mode 100644 index 0000000..c17a08e --- /dev/null +++ b/sys/include/dev/pci/pci.h @@ -0,0 +1,70 @@ +/* + * 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. + */ + +#ifndef _DEV_PCI_H_ +#define _DEV_PCI_H_ + +#include +#include +#include + +/* Lookup bits */ +#define PCI_DEVICE_ID __BIT(0) +#define PCI_VENDOR_ID __BIT(1) +#define PCI_CLASS __BIT(2) +#define PCI_SUBCLASS __BIT(3) + +/* For PCI lookups */ +struct pci_lookup { + uint16_t device_id; + uint16_t vendor_id; + uint8_t pci_class; + uint8_t pci_subclass; +}; + +struct pci_device { + uint8_t bus; + uint8_t slot; + uint8_t func; + + uint16_t device_id; + uint16_t vendor_id; + uint8_t pci_class; + uint8_t pci_subclass; + uint8_t prog_if; + uintptr_t bar[6]; + uint8_t irq_line; + TAILQ_ENTRY(pci_device) link; +}; + +int pci_init(void); +uint32_t pci_readl(struct pci_device *dev, uint32_t offset); +struct pci_device *pci_get_device(struct pci_lookup lookup, uint16_t lookup_type); + +#endif /* !_DEV_PCI_H_ */ diff --git a/sys/include/dev/pci/pcivar.h b/sys/include/dev/pci/pcivar.h new file mode 100644 index 0000000..ba45a53 --- /dev/null +++ b/sys/include/dev/pci/pcivar.h @@ -0,0 +1,40 @@ +/* + * 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. + */ + +#ifndef _DEV_PCIVAR_H_ +#define _DEV_PCIVAR_H_ + +#include + +enum { + PCI_ACCESS_CAM, + PCI_ACCESS_ECAM +}; + +#endif /* !_DEV_PCIVAR_H_ */ -- cgit v1.2.3