pci.c

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/*
 * Copyright (c) 2011 Jan Vesely
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <errno.h>
#include <str_error.h>
#include <assert.h>
#include <as.h>
#include <devman.h>
#include <ddi.h>
#include <libarch/ddi.h>
#include <device/hw_res.h>

#include <usb/debug.h>
#include <pci_dev_iface.h>

#include "pci.h"

#define PAGE_SIZE_MASK 0xfffff000

#define HCC_PARAMS_OFFSET 0x8
#define HCC_PARAMS_EECP_MASK 0xff
#define HCC_PARAMS_EECP_OFFSET 8

#define CMD_OFFSET 0x0
#define STS_OFFSET 0x4
#define INT_OFFSET 0x8
#define CFG_OFFSET 0x40

#define USBCMD_RUN 1
#define USBSTS_HALTED (1 << 12)

#define USBLEGSUP_OFFSET 0
#define USBLEGSUP_BIOS_CONTROL (1 << 16)
#define USBLEGSUP_OS_CONTROL (1 << 24)
#define USBLEGCTLSTS_OFFSET 4

#define DEFAULT_WAIT 1000
#define WAIT_STEP 10

#define PCI_READ(size) \
do { \
        const int parent_phone = \
            devman_parent_device_connect(dev->handle, IPC_FLAG_BLOCKING);\
        if (parent_phone < 0) {\
                return parent_phone; \
        } \
        sysarg_t add = (sysarg_t)address; \
        sysarg_t val; \
        const int ret = \
            async_req_2_1(parent_phone, DEV_IFACE_ID(PCI_DEV_IFACE), \
                IPC_M_CONFIG_SPACE_READ_##size, add, &val); \
        assert(value); \
        *value = val; \
        async_hangup(parent_phone); \
        return ret; \
} while(0)

static int pci_read32(const ddf_dev_t *dev, int address, uint32_t *value)
{
        PCI_READ(32);
}
static int pci_read16(const ddf_dev_t *dev, int address, uint16_t *value)
{
        PCI_READ(16);
}
static int pci_read8(const ddf_dev_t *dev, int address, uint8_t *value)
{
        PCI_READ(8);
}
#define PCI_WRITE(size) \
do { \
        const int parent_phone = \
            devman_parent_device_connect(dev->handle, IPC_FLAG_BLOCKING);\
        if (parent_phone < 0) {\
                return parent_phone; \
        } \
        sysarg_t add = (sysarg_t)address; \
        sysarg_t val = value; \
        const int ret = \
            async_req_3_0(parent_phone, DEV_IFACE_ID(PCI_DEV_IFACE), \
                IPC_M_CONFIG_SPACE_WRITE_##size, add, val); \
        async_hangup(parent_phone); \
        return ret; \
} while(0)

static int pci_write32(const ddf_dev_t *dev, int address, uint32_t value)
{
        PCI_WRITE(32);
}
static int pci_write16(const ddf_dev_t *dev, int address, uint16_t value)
{
        PCI_WRITE(16);
}
static int pci_write8(const ddf_dev_t *dev, int address, uint8_t value)
{
        PCI_WRITE(8);
}

int pci_get_my_registers(const ddf_dev_t *dev,
    uintptr_t *mem_reg_address, size_t *mem_reg_size, int *irq_no)
{
        assert(dev != NULL);

        const int parent_phone =
            devman_parent_device_connect(dev->handle, IPC_FLAG_BLOCKING);
        if (parent_phone < 0) {
                return parent_phone;
        }

        int rc;

        hw_resource_list_t hw_resources;
        rc = hw_res_get_resource_list(parent_phone, &hw_resources);
        if (rc != EOK) {
                async_hangup(parent_phone);
                return rc;
        }

        uintptr_t mem_address = 0;
        size_t mem_size = 0;
        bool mem_found = false;

        int irq = 0;
        bool irq_found = false;

        size_t i;
        for (i = 0; i < hw_resources.count; i++) {
                hw_resource_t *res = &hw_resources.resources[i];
                switch (res->type)
                {
                case INTERRUPT:
                        irq = res->res.interrupt.irq;
                        irq_found = true;
                        usb_log_debug2("Found interrupt: %d.\n", irq);
                        break;

                case MEM_RANGE:
                        if (res->res.mem_range.address != 0
                            && res->res.mem_range.size != 0 ) {
                                mem_address = res->res.mem_range.address;
                                mem_size = res->res.mem_range.size;
                                usb_log_debug2("Found mem: %" PRIxn" %zu.\n",
                                    mem_address, mem_size);
                                mem_found = true;
                                }
                default:
                        break;
                }
        }

        if (mem_found && irq_found) {
                *mem_reg_address = mem_address;
                *mem_reg_size = mem_size;
                *irq_no = irq;
                rc = EOK;
        } else {
                rc = ENOENT;
        }

        async_hangup(parent_phone);
        return rc;
}
/*----------------------------------------------------------------------------*/
int pci_enable_interrupts(const ddf_dev_t *device)
{
        const int parent_phone =
            devman_parent_device_connect(device->handle, IPC_FLAG_BLOCKING);
        if (parent_phone < 0) {
                return parent_phone;
        }
        const bool enabled = hw_res_enable_interrupt(parent_phone);
        async_hangup(parent_phone);
        return enabled ? EOK : EIO;
}
/*----------------------------------------------------------------------------*/
int pci_disable_legacy(
    const ddf_dev_t *device, uintptr_t reg_base, size_t reg_size, int irq)
{
        assert(device);
        (void) pci_read16;
        (void) pci_read8;
        (void) pci_write16;

#define CHECK_RET_RETURN(ret, message...) \
        if (ret != EOK) { \
                usb_log_error(message); \
                return ret; \
        } else (void)0

        /* Map EHCI registers */
        void *regs = NULL;
        int ret = pio_enable((void*)reg_base, reg_size, &regs);
        CHECK_RET_RETURN(ret, "Failed to map registers %p: %s.\n",
            (void *) reg_base, str_error(ret));

        const uint32_t hcc_params =
            *(uint32_t*)(regs + HCC_PARAMS_OFFSET);
        usb_log_debug("Value of hcc params register: %x.\n", hcc_params);

        /* Read value of EHCI Extended Capabilities Pointer
         * position of EEC registers (points to PCI config space) */
        const uint32_t eecp =
            (hcc_params >> HCC_PARAMS_EECP_OFFSET) & HCC_PARAMS_EECP_MASK;
        usb_log_debug("Value of EECP: %x.\n", eecp);

        /* Read the first EEC. i.e. Legacy Support register */
        uint32_t usblegsup;
        ret = pci_read32(device, eecp + USBLEGSUP_OFFSET, &usblegsup);
        CHECK_RET_RETURN(ret, "Failed to read USBLEGSUP: %s.\n", str_error(ret));
        usb_log_debug("USBLEGSUP: %" PRIx32 ".\n", usblegsup);

        /* Request control from firmware/BIOS, by writing 1 to highest byte.
         * (OS Control semaphore)*/
        usb_log_debug("Requesting OS control.\n");
        ret = pci_write8(device, eecp + USBLEGSUP_OFFSET + 3, 1);
        CHECK_RET_RETURN(ret, "Failed to request OS EHCI control: %s.\n",
            str_error(ret));

        size_t wait = 0;
        /* Wait for BIOS to release control. */
        ret = pci_read32(device, eecp + USBLEGSUP_OFFSET, &usblegsup);
        while ((wait < DEFAULT_WAIT) && (usblegsup & USBLEGSUP_BIOS_CONTROL)) {
                async_usleep(WAIT_STEP);
                ret = pci_read32(device, eecp + USBLEGSUP_OFFSET, &usblegsup);
                wait += WAIT_STEP;
        }


        if ((usblegsup & USBLEGSUP_BIOS_CONTROL) == 0) {
                usb_log_info("BIOS released control after %zu usec.\n", wait);
        } else {
                /* BIOS failed to hand over control, this should not happen. */
                usb_log_warning( "BIOS failed to release control after "
                    "%zu usecs, force it.\n", wait);
                ret = pci_write32(device, eecp + USBLEGSUP_OFFSET,
                    USBLEGSUP_OS_CONTROL);
                CHECK_RET_RETURN(ret, "Failed to force OS control: %s.\n",
                    str_error(ret));
                /* Check capability type here, A value of 01h
                 * identifies the capability as Legacy Support.
                 * This extended capability requires one
                 * additional 32-bit register for control/status information,
                 * and this register is located at offset EECP+04h
                 * */
                if ((usblegsup & 0xff) == 1) {
                        /* Read the second EEC
                         * Legacy Support and Control register */
                        uint32_t usblegctlsts;
                        ret = pci_read32(
                            device, eecp + USBLEGCTLSTS_OFFSET, &usblegctlsts);
                        CHECK_RET_RETURN(ret,
                            "Failed to get USBLEGCTLSTS: %s.\n", str_error(ret));
                        usb_log_debug("USBLEGCTLSTS: %" PRIx32 ".\n",
                            usblegctlsts);
                        /* Zero SMI enables in legacy control register.
                         * It should prevent pre-OS code from interfering. */
                        ret = pci_write32(device, eecp + USBLEGCTLSTS_OFFSET,
                            0xe0000000); /* three upper bits are WC */
                        CHECK_RET_RETURN(ret,
                            "Failed(%d) zero USBLEGCTLSTS.\n", ret);
                        udelay(10);
                        ret = pci_read32(
                            device, eecp + USBLEGCTLSTS_OFFSET, &usblegctlsts);
                        CHECK_RET_RETURN(ret,
                            "Failed to get USBLEGCTLSTS 2: %s.\n",
                            str_error(ret));
                        usb_log_debug("Zeroed USBLEGCTLSTS: %" PRIx32 ".\n",
                            usblegctlsts);
                }
        }


        /* Read again Legacy Support register */
        ret = pci_read32(device, eecp + USBLEGSUP_OFFSET, &usblegsup);
        CHECK_RET_RETURN(ret, "Failed to read USBLEGSUP: %s.\n", str_error(ret));
        usb_log_debug("USBLEGSUP: %" PRIx32 ".\n", usblegsup);

        /*
         * TURN OFF EHCI FOR NOW, DRIVER WILL REINITIALIZE IT
         */

        /* Get size of capability registers in memory space. */
        const unsigned operation_offset = *(uint8_t*)regs;
        usb_log_debug("USBCMD offset: %d.\n", operation_offset);

        /* Zero USBCMD register. */
        volatile uint32_t *usbcmd =
            (uint32_t*)((uint8_t*)regs + operation_offset + CMD_OFFSET);
        volatile uint32_t *usbsts =
            (uint32_t*)((uint8_t*)regs + operation_offset + STS_OFFSET);
        volatile uint32_t *usbconf =
            (uint32_t*)((uint8_t*)regs + operation_offset + CFG_OFFSET);
        volatile uint32_t *usbint =
            (uint32_t*)((uint8_t*)regs + operation_offset + INT_OFFSET);
        usb_log_debug("USBCMD value: %x.\n", *usbcmd);
        if (*usbcmd & USBCMD_RUN) {
                *usbsts = 0x3f; /* ack all interrupts */
                *usbint = 0; /* disable all interrutps */
                *usbconf = 0; /* relase control of RH ports */

                *usbcmd = 0;
                /* Wait until hc is halted */
                while ((*usbsts & USBSTS_HALTED) == 0);
                usb_log_info("EHCI turned off.\n");
        } else {
                usb_log_info("EHCI was not running.\n");
        }
        usb_log_debug("Registers: \n"
            "\t USBCMD: %x(0x00080000 = at least 1ms between interrupts)\n"
            "\t USBSTS: %x(0x00001000 = HC halted)\n"
            "\t USBINT: %x(0x0 = no interrupts).\n"
            "\t CONFIG: %x(0x0 = ports controlled by companion hc).\n",
            *usbcmd, *usbsts, *usbint, *usbconf);

        return ret;
#undef CHECK_RET_RETURN
}
/*----------------------------------------------------------------------------*/

---