source: rtems/cpukit/libpci/pci_cfg_static.c

/* SPDX-License-Identifier: BSD-2-Clause */

/*  PCI (Static) Configuration Library
 *
 *  COPYRIGHT (c) 2010 Cobham Gaisler AB.
 *
 * 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.
 *
 * 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.
 */
 
/*
 * The Host Bridge bus must be declared by user. It contains the static
 * configuration used to setup the devices/functions.
 */

/* Configure headers */
#define PCI_CFG_STATIC_LIB

#include <stdlib.h>
#include <pci.h>
#include <pci/access.h>
#include <pci/cfg.h>

#include "pci_internal.h"

#define PCI_CFG_R8(dev, args...) pci_cfg_r8(dev, args)
#define PCI_CFG_R16(dev, args...) pci_cfg_r16(dev, args)
#define PCI_CFG_R32(dev, args...) pci_cfg_r32(dev, args)
#define PCI_CFG_W8(dev, args...) pci_cfg_w8(dev, args)
#define PCI_CFG_W16(dev, args...) pci_cfg_w16(dev, args)
#define PCI_CFG_W32(dev, args...) pci_cfg_w32(dev, args)

/* Enumrate one bus if device is a bridge, and all it's subordinate buses */
static int pci_init_dev(struct pci_dev *dev, void *unused)
{
        uint32_t tmp;
        uint16_t tmp16, cmd;
        struct pci_bus *bridge;
        int maxbars, i, romofs;
        pci_dev_t pcidev = dev->busdevfun;
        struct pci_res *res;

        /* Init Device */

        /* Set command to reset values, it disables bus
         * mastering and address responses.
         */
        PCI_CFG_W16(pcidev, PCIR_COMMAND, 0);

        /* Clear any already set status bits */
        PCI_CFG_W16(pcidev, PCIR_STATUS, 0xf900);

        /* Set latency timer to 64 */
        PCI_CFG_W8(pcidev, PCIR_LATTIMER, 64);

        /* Set System IRQ of PIN */
        PCI_CFG_W8(pcidev, PCIR_INTLINE, dev->sysirq);

        cmd = dev->command;

        if ((dev->flags & PCI_DEV_BRIDGE) == 0) {
                /* Disable Cardbus CIS Pointer */
                PCI_CFG_W32(pcidev, PCIR_CIS, 0);

                romofs = PCIR_BIOS;
                maxbars = 6;
        } else {
                /* Init Bridge */

                /* Configure bridge (no support for 64-bit) */
                PCI_CFG_W32(pcidev, PCIR_PMBASEH_1, 0);
                PCI_CFG_W32(pcidev, PCIR_PMLIMITH_1, 0);

                bridge = (struct pci_bus *)dev;
                tmp = (64 << 24) | (bridge->sord << 16) |
                        (bridge->num << 8) | bridge->pri;
                PCI_CFG_W32(pcidev, PCIR_PRIBUS_1, tmp);

                /*** Setup I/O Bridge Window ***/
                res = &dev->resources[BRIDGE_RES_IO];
                if (res->size > 0) {
                        tmp16 = ((res->end-1) & 0x0000f000) |
                                ((res->start & 0x0000f000) >> 8);
                        tmp = ((res->end-1) & 0xffff0000) | (res->start >> 16);
                        cmd |= PCIM_CMD_PORTEN;
                } else {
                        tmp16 = 0x00ff;
                        tmp = 0;
                }
                /* I/O Limit and Base */
                PCI_CFG_W16(pcidev, PCIR_IOBASEL_1, tmp16);
                PCI_CFG_W32(pcidev, PCIR_IOBASEH_1, tmp);

                /*** Setup MEMIO Bridge Window ***/
                res = &dev->resources[BRIDGE_RES_MEMIO];
                if (res->size > 0) {
                        tmp = ((res->end-1) & 0xffff0000) |
                                (res->start >> 16);
                        cmd |= PCIM_CMD_MEMEN;
                } else {
                        tmp = 0x0000ffff;
                }
                /* MEMIO Limit and Base */
                PCI_CFG_W32(pcidev, PCIR_MEMBASE_1, tmp);

                /*** Setup MEM Bridge Window ***/
                res = &dev->resources[BRIDGE_RES_MEM];
                if (res->size > 0) {
                        tmp = ((res->end-1) & 0xffff0000) |
                                (res->start >> 16);
                        cmd |= PCIM_CMD_MEMEN;
                } else {
                        tmp = 0x0000ffff;
                }
                /* MEM Limit and Base */
                PCI_CFG_W32(pcidev, PCIR_PMBASEL_1, tmp);
                /* 64-bit space not supported */
                PCI_CFG_W32(pcidev, PCIR_PMBASEH_1, 0);
                PCI_CFG_W32(pcidev, PCIR_PMLIMITH_1, 0);

                cmd |= PCIM_CMD_BUSMASTEREN;
                romofs = PCIR_BIOS_1;
                maxbars = 2;
        }

        /* Init BARs */
        for (i = 0; i < maxbars; i++) {
                res = &dev->resources[i];
                if (res->flags & PCI_RES_TYPE_MASK) {
                        PCI_CFG_W32(pcidev, PCIR_BAR(0) + 4*i,
                                                                res->start);
                        if ((res->flags & PCI_RES_TYPE_MASK) == PCI_RES_IO)
                                cmd |= PCIM_CMD_PORTEN;
                        else
                                cmd |= PCIM_CMD_MEMEN;
                }
        }
        res = &dev->resources[DEV_RES_ROM];
        if (res->flags & PCI_RES_TYPE_MASK) {
                PCI_CFG_W32(pcidev, romofs, res->start|PCIM_BIOS_ENABLE);
                cmd |= PCIM_CMD_MEMEN;
        }
        PCI_CFG_W16(pcidev, PCIR_COMMAND, cmd);

        return 0;
}

/* Assume that user has defined static setup array in pci_hb */
int pci_config_static(void)
{
        pci_bus_cnt = pci_hb.sord + 1;
        pci_system_type = PCI_SYSTEM_HOST;

        /* Init all PCI devices according to depth-first search algorithm */
        return pci_for_each_dev(pci_init_dev, NULL);
}