/* Author:
   Rudolf Cornelissen 6/2004-4/2006
*/

#define MODULE_BIT 0x00000100

#include <unistd.h>
#include "nv_std.h"

static void nv_agp_list_info(agp_info ai);
static void nv_agp_list_active(uint32 cmd);


status_t
nv_agp_setup(bool enable_agp)
{
        nv_nth_agp_info nai;
        nv_cmd_agp nca;
        uint8 index;
        agp_info nv_ai = {0};
        bool agp = false;

        /* preset we are running in PCI mode: so acc engine may not use AGP transfers */
        si->engine.agp_mode = false;

        /* first try to enable FW support on our card if user requested this
         * ('unsupported' tweak!)
         * This has no effect on PCI cards. */
        if (si->settings.unhide_fw) {
                uint32 reg;

                LOG(4, ("AGP: STRAPINFO2 contains $%08x\n", NV_REG32(NV32_NVSTRAPINFO2)));

                LOG(4, ("AGP: attempting to enable fastwrite support..\n"));
                /* 'force' FW support */
                reg = (NV_REG32(NV32_NVSTRAPINFO2) & ~0x00000800);
                /* enable strapinfo overwrite */
                NV_REG32(NV32_NVSTRAPINFO2) = (reg | 0x80000000);

                LOG(4, ("AGP: STRAPINFO2 now contains $%08x\n", NV_REG32(NV32_NVSTRAPINFO2)));
        }

        /* set the magic number so the nvidia kerneldriver knows we're for real */
        nca.magic = nai.magic = NV_PRIVATE_DATA_MAGIC;

        /* contact driver and get a pointer to the registers and shared data */
        for (index = 0; index < 8; index++) {
                /* get nth AGP device info */
                nai.index = index;
                ioctl(fd, NV_GET_NTH_AGP_INFO, &nai, sizeof(nai));

                /* abort if no agp busmanager found */
                if (!nai.agp_bus) {
                        LOG(4,("AGP: no AGP busmanager found.\n"));
                        /* don't touch AGP command register, we don't know what has been setup:
                         * touching it anyway might 'hang' the graphics card! */

                        return B_ERROR;
                }

                /* exit if we didn't get device info for this index */
                if (!nai.exist) {
                        if (index != 0)
                                LOG(4,("AGP: end of AGP capable devices list.\n"));
                        else
                                LOG(4,("AGP: no AGP capable devices found.\n"));
                        break;
                }

                LOG(4,("AGP: AGP capable device #%d:\n", (index + 1)));

                /* see if we are this one */
                if (nai.agpi.device_id == si->device_id
                        && nai.agpi.vendor_id == si->vendor_id
                        && nai.agpi.bus == si->bus
                        && nai.agpi.device == si->device
                        && nai.agpi.function == si->function) {
                        LOG(4,("AGP: (this is the device this accelerant controls)\n"));
                        agp = true;
                        /* remember our info */
                        nv_ai = nai.agpi;
                }

                /* log capabilities */
                nv_agp_list_info(nai.agpi);
        }

        /* if our card is not an AGP type, abort here */
        /* Note:
         * We have to iterate through the capability list as specified in the PCI spec
         * one way or the other, otherwise we cannot distinquish between nVidia PCI and
         * AGP type cards as nVidia PCI cards still have AGP registers that pretend to
         * support AGP.
         * We rely on the AGP busmanager to iterate trough this list for us. */
        if (!agp) {
                LOG(4,("AGP: the graphicscard this accelerant controls is PCI type.\n"));

                /* make sure card is set for PCI access */
                CFGW(AGPCMD, 0x00000000);

                return B_ERROR;
        }

        if (si->settings.force_pci || !enable_agp) {
                /* set PCI mode if specified by user in nv.settings */
                if (enable_agp)
                        LOG(4,("AGP: forcing PCI mode (specified in nv.settings)\n"));
                else
                        LOG(4,("AGP: forcing PCI mode during coldstart (required)\n"));

                /* let the AGP busmanager setup PCI mode.
                 * (the AGP speed scheme is of no consequence now) */
                nca.cmd = 0x00000000;
                ioctl(fd, NV_ENABLE_AGP, &nca, sizeof(nca));
        } else {
                /* activate AGP mode */
                LOG(4,("AGP: activating AGP mode...\n"));

                /* let the AGP busmanager worry about what mode to set.. */
                nca.cmd = 0xfffffff7;
                /* ..but we do need to select the right speed scheme fetched from our card */
                if (nv_ai.interface.status & AGP_3_MODE)
                        nca.cmd |= AGP_3_MODE;
                ioctl(fd, NV_ENABLE_AGP, &nca, sizeof(nca));
                /* tell the engine in may use AGP transfers if AGP is up and running */
                if (nca.cmd & AGP_ENABLE)
                        si->engine.agp_mode = true;
        }

        /* list mode now activated,
         * make sure we have the correct speed scheme for logging */
        nv_agp_list_active(nca.cmd | (nv_ai.interface.status & AGP_3_MODE));

        /* extra check */
        LOG(4,("AGP: graphics card AGPCMD register readback $%08x\n", CFGR(AGPCMD)));
        return B_OK;
}


static void
nv_agp_list_info(agp_info ai)
{
        /*
                list device
        */
        if (ai.class_base == PCI_display)
                LOG(4,("AGP: device is a graphicscard, subclass ID is $%02x\n", ai.class_sub));
        else
                LOG(4,("AGP: device is a hostbridge, subclass ID is $%02x\n", ai.class_sub));
        LOG(4,("AGP: vendor ID $%04x\n", ai.vendor_id));
        LOG(4,("AGP: device ID $%04x\n", ai.device_id));
        LOG(4,("AGP: bus %d, device %d, function %d\n", ai.bus, ai.device, ai.function));

        /*
                list capabilities
        */
        LOG(4,("AGP: this device supports AGP specification %d.%d;\n",
                ((ai.interface.capability_id & AGP_REV_MAJOR) >> AGP_REV_MAJOR_SHIFT),
                ((ai.interface.capability_id & AGP_REV_MINOR) >> AGP_REV_MINOR_SHIFT)));

        /* the AGP devices determine AGP speed scheme version used on power-up/reset */
        if (!(ai.interface.status & AGP_3_MODE)) {
                /* AGP 2.0 scheme applies */
                if (ai.interface.status & AGP_2_1x)
                        LOG(4,("AGP: AGP 2.0 1x mode is available\n"));
                if (ai.interface.status & AGP_2_2x)
                        LOG(4,("AGP: AGP 2.0 2x mode is available\n"));
                if (ai.interface.status & AGP_2_4x)
                        LOG(4,("AGP: AGP 2.0 4x mode is available\n"));
        } else {
                /* AGP 3.0 scheme applies */
                if (ai.interface.status & AGP_3_4x)
                        LOG(4,("AGP: AGP 3.0 4x mode is available\n"));
                if (ai.interface.status & AGP_3_8x)
                        LOG(4,("AGP: AGP 3.0 8x mode is available\n"));
        }
        if (ai.interface.status & AGP_FAST_WRITE)
                LOG(4,("AGP: fastwrite transfers are supported\n"));
        if (ai.interface.status & AGP_SBA)
                LOG(4,("AGP: sideband adressing is supported\n"));
        LOG(4,("AGP: %d queued AGP requests can be handled.\n",
                (((ai.interface.status & AGP_REQUEST) >> AGP_REQUEST_SHIFT) + 1)));

        /*
                list current settings,
                make sure we have the correct speed scheme for logging
         */
        nv_agp_list_active(ai.interface.command
                | (ai.interface.status & AGP_3_MODE));
}


static void
nv_agp_list_active(uint32 cmd)
{
        LOG(4,("AGP: listing settings now in use:\n"));
        if (!(cmd & AGP_3_MODE)) {
                /* AGP 2.0 scheme applies */
                if (cmd & AGP_2_1x)
                        LOG(4,("AGP: AGP 2.0 1x mode is set\n"));
                if (cmd & AGP_2_2x)
                        LOG(4,("AGP: AGP 2.0 2x mode is set\n"));
                if (cmd & AGP_2_4x)
                        LOG(4,("AGP: AGP 2.0 4x mode is set\n"));
        } else {
                /* AGP 3.0 scheme applies */
                if (cmd & AGP_3_4x)
                        LOG(4,("AGP: AGP 3.0 4x mode is set\n"));
                if (cmd & AGP_3_8x)
                        LOG(4,("AGP: AGP 3.0 8x mode is set\n"));
        }
        if (cmd & AGP_FAST_WRITE)
                LOG(4,("AGP: fastwrite transfers are enabled\n"));
        if (cmd & AGP_SBA)
                LOG(4,("AGP: sideband adressing is enabled\n"));
        LOG(4,("AGP: max. AGP queued request depth is set to %d\n",
                (((cmd & AGP_REQUEST) >> AGP_REQUEST_SHIFT) + 1)));
        if (cmd & AGP_ENABLE)
                LOG(4,("AGP: the AGP interface is enabled.\n"));
        else
                LOG(4,("AGP: the AGP interface is disabled.\n"));
}