/*
 * Copyright 2012 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 */
/*
 * Authors: Dave Airlie <airlied@redhat.com>
 */
#include <drm/drmP.h>
#include "ast_drv.h"


#include <drm/drm_fb_helper.h>
#include <drm/drm_crtc_helper.h>

void ast_set_index_reg_mask(struct ast_private *ast,
                            uint32_t base, uint8_t index,
                            uint8_t mask, uint8_t val)
{
        u8 tmp;
        ast_io_write8(ast, base, index);
        tmp = (ast_io_read8(ast, base + 1) & mask) | val;
        ast_set_index_reg(ast, base, index, tmp);
}

uint8_t ast_get_index_reg(struct ast_private *ast,
                          uint32_t base, uint8_t index)
{
        uint8_t ret;
        ast_io_write8(ast, base, index);
        ret = ast_io_read8(ast, base + 1);
        return ret;
}

uint8_t ast_get_index_reg_mask(struct ast_private *ast,
                               uint32_t base, uint8_t index, uint8_t mask)
{
        uint8_t ret;
        ast_io_write8(ast, base, index);
        ret = ast_io_read8(ast, base + 1) & mask;
        return ret;
}

static void ast_detect_config_mode(struct drm_device *dev, u32 *scu_rev)
{
        struct device_node *np = dev->pdev->dev.of_node;
        struct ast_private *ast = dev->dev_private;
        uint32_t data, jregd0, jregd1;

        /* Defaults */
        ast->config_mode = ast_use_defaults;
        *scu_rev = 0xffffffff;

        /* Check if we have device-tree properties */
        if (np && !of_property_read_u32(np, "aspeed,scu-revision-id",
                                        scu_rev)) {
                /* We do, disable P2A access */
                ast->config_mode = ast_use_dt;
                DRM_INFO("Using device-tree for configuration\n");
                return;
        }

        /* Not all families have a P2A bridge */
        if (dev->pdev->device != PCI_CHIP_AST2000)
                return;

        /*
         * The BMC will set SCU 0x40 D[12] to 1 if the P2 bridge
         * is disabled. We force using P2A if VGA only mode bit
         * is set D[7]
         */
        jregd0 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
        jregd1 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
        if (!(jregd0 & 0x80) || !(jregd1 & 0x10)) {
                /* Double check it's actually working */
                data = ast_read32(ast, 0xf004);
                if (data != 0xFFFFFFFF) {
                        /* P2A works, grab silicon revision */
                        ast->config_mode = ast_use_p2a;

                        DRM_INFO("Using P2A bridge for configuration\n");

                        /* Read SCU7c (silicon revision register) */
                        ast_write32(ast, 0xf004, 0x1e6e0000);
                        ast_write32(ast, 0xf000, 0x1);
                        *scu_rev = ast_read32(ast, 0x1207c);
                        return;
                }
        }

        /* We have a P2A bridge but it's disabled */
        DRM_INFO("P2A bridge disabled, using default configuration\n");
}

static int ast_detect_chip(struct drm_device *dev, bool *need_post)
{
        struct ast_private *ast = dev->dev_private;
        uint32_t jreg, scu_rev;

        /*
         * If VGA isn't enabled, we need to enable now or subsequent
         * access to the scratch registers will fail. We also inform
         * our caller that it needs to POST the chip
         * (Assumption: VGA not enabled -> need to POST)
         */
        if (!ast_is_vga_enabled(dev)) {
                ast_enable_vga(dev);
                DRM_INFO("VGA not enabled on entry, requesting chip POST\n");
                *need_post = true;
        } else
                *need_post = false;


        /* Enable extended register access */
        ast_enable_mmio(dev);
        ast_open_key(ast);

        /* Find out whether P2A works or whether to use device-tree */
        ast_detect_config_mode(dev, &scu_rev);

        /* Identify chipset */
        if (dev->pdev->device == PCI_CHIP_AST1180) {
                ast->chip = AST1100;
                DRM_INFO("AST 1180 detected\n");
        } else {
                if (dev->pdev->revision >= 0x40) {
                        ast->chip = AST2500;
                        DRM_INFO("AST 2500 detected\n");
                } else if (dev->pdev->revision >= 0x30) {
                        ast->chip = AST2400;
                        DRM_INFO("AST 2400 detected\n");
                } else if (dev->pdev->revision >= 0x20) {
                        ast->chip = AST2300;
                        DRM_INFO("AST 2300 detected\n");
                } else if (dev->pdev->revision >= 0x10) {
                        switch (scu_rev & 0x0300) {
                        case 0x0200:
                                ast->chip = AST1100;
                                DRM_INFO("AST 1100 detected\n");
                                break;
                        case 0x0100:
                                ast->chip = AST2200;
                                DRM_INFO("AST 2200 detected\n");
                                break;
                        case 0x0000:
                                ast->chip = AST2150;
                                DRM_INFO("AST 2150 detected\n");
                                break;
                        default:
                                ast->chip = AST2100;
                                DRM_INFO("AST 2100 detected\n");
                                break;
                        }
                        ast->vga2_clone = false;
                } else {
                        ast->chip = AST2000;
                        DRM_INFO("AST 2000 detected\n");
                }
        }

        /* Check if we support wide screen */
        switch (ast->chip) {
        case AST1180:
                ast->support_wide_screen = true;
                break;
        case AST2000:
                ast->support_wide_screen = false;
                break;
        default:
                jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
                if (!(jreg & 0x80))
                        ast->support_wide_screen = true;
                else if (jreg & 0x01)
                        ast->support_wide_screen = true;
                else {
                        ast->support_wide_screen = false;
                        if (ast->chip == AST2300 &&
                            (scu_rev & 0x300) == 0x0) /* ast1300 */
                                ast->support_wide_screen = true;
                        if (ast->chip == AST2400 &&
                            (scu_rev & 0x300) == 0x100) /* ast1400 */
                                ast->support_wide_screen = true;
                        if (ast->chip == AST2500 &&
                            scu_rev == 0x100)           /* ast2510 */
                                ast->support_wide_screen = true;
                }
                break;
        }

        /* Check 3rd Tx option (digital output afaik) */
        ast->tx_chip_type = AST_TX_NONE;

        /*
         * VGACRA3 Enhanced Color Mode Register, check if DVO is already
         * enabled, in that case, assume we have a SIL164 TMDS transmitter
         *
         * Don't make that assumption if we the chip wasn't enabled and
         * is at power-on reset, otherwise we'll incorrectly "detect" a
         * SIL164 when there is none.
         */
        if (!*need_post) {
                jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa3, 0xff);
                if (jreg & 0x80)
                        ast->tx_chip_type = AST_TX_SIL164;
        }

        if ((ast->chip == AST2300) || (ast->chip == AST2400)) {
                /*
                 * On AST2300 and 2400, look the configuration set by the SoC in
                 * the SOC scratch register #1 bits 11:8 (interestingly marked
                 * as "reserved" in the spec)
                 */
                jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
                switch (jreg) {
                case 0x04:
                        ast->tx_chip_type = AST_TX_SIL164;
                        break;
                case 0x08:
                        ast->dp501_fw_addr = kzalloc(32*1024, GFP_KERNEL);
                        if (ast->dp501_fw_addr) {
                                /* backup firmware */
                                if (ast_backup_fw(dev, ast->dp501_fw_addr, 32*1024)) {
                                        kfree(ast->dp501_fw_addr);
                                        ast->dp501_fw_addr = NULL;
                                }
                        }
                        /* fallthrough */
                case 0x0c:
                        ast->tx_chip_type = AST_TX_DP501;
                }
        }

        /* Print stuff for diagnostic purposes */
        switch(ast->tx_chip_type) {
        case AST_TX_SIL164:
                DRM_INFO("Using Sil164 TMDS transmitter\n");
                break;
        case AST_TX_DP501:
                DRM_INFO("Using DP501 DisplayPort transmitter\n");
                break;
        default:
                DRM_INFO("Analog VGA only\n");
        }
        return 0;
}

static int ast_get_dram_info(struct drm_device *dev)
{
        struct device_node *np = dev->pdev->dev.of_node;
        struct ast_private *ast = dev->dev_private;
        uint32_t mcr_cfg, mcr_scu_mpll, mcr_scu_strap;
        uint32_t denum, num, div, ref_pll, dsel;

        switch (ast->config_mode) {
        case ast_use_dt:
                /*
                 * If some properties are missing, use reasonable
                 * defaults for AST2400
                 */
                if (of_property_read_u32(np, "aspeed,mcr-configuration",
                                         &mcr_cfg))
                        mcr_cfg = 0x00000577;
                if (of_property_read_u32(np, "aspeed,mcr-scu-mpll",
                                         &mcr_scu_mpll))
                        mcr_scu_mpll = 0x000050C0;
                if (of_property_read_u32(np, "aspeed,mcr-scu-strap",
                                         &mcr_scu_strap))
                        mcr_scu_strap = 0;
                break;
        case ast_use_p2a:
                ast_write32(ast, 0xf004, 0x1e6e0000);
                ast_write32(ast, 0xf000, 0x1);
                mcr_cfg = ast_read32(ast, 0x10004);
                mcr_scu_mpll = ast_read32(ast, 0x10120);
                mcr_scu_strap = ast_read32(ast, 0x10170);
                break;
        case ast_use_defaults:
        default:
                ast->dram_bus_width = 16;
                ast->dram_type = AST_DRAM_1Gx16;
                if (ast->chip == AST2500)
                        ast->mclk = 800;
                else
                        ast->mclk = 396;
                return 0;
        }

        if (mcr_cfg & 0x40)
                ast->dram_bus_width = 16;
        else
                ast->dram_bus_width = 32;

        if (ast->chip == AST2500) {
                switch (mcr_cfg & 0x03) {
                case 0:
                        ast->dram_type = AST_DRAM_1Gx16;
                        break;
                default:
                case 1:
                        ast->dram_type = AST_DRAM_2Gx16;
                        break;
                case 2:
                        ast->dram_type = AST_DRAM_4Gx16;
                        break;
                case 3:
                        ast->dram_type = AST_DRAM_8Gx16;
                        break;
                }
        } else if (ast->chip == AST2300 || ast->chip == AST2400) {
                switch (mcr_cfg & 0x03) {
                case 0:
                        ast->dram_type = AST_DRAM_512Mx16;
                        break;
                default:
                case 1:
                        ast->dram_type = AST_DRAM_1Gx16;
                        break;
                case 2:
                        ast->dram_type = AST_DRAM_2Gx16;
                        break;
                case 3:
                        ast->dram_type = AST_DRAM_4Gx16;
                        break;
                }
        } else {
                switch (mcr_cfg & 0x0c) {
                case 0:
                case 4:
                        ast->dram_type = AST_DRAM_512Mx16;
                        break;
                case 8:
                        if (mcr_cfg & 0x40)
                                ast->dram_type = AST_DRAM_1Gx16;
                        else
                                ast->dram_type = AST_DRAM_512Mx32;
                        break;
                case 0xc:
                        ast->dram_type = AST_DRAM_1Gx32;
                        break;
                }
        }

        if (mcr_scu_strap & 0x2000)
                ref_pll = 14318;
        else
                ref_pll = 12000;

        denum = mcr_scu_mpll & 0x1f;
        num = (mcr_scu_mpll & 0x3fe0) >> 5;
        dsel = (mcr_scu_mpll & 0xc000) >> 14;
        switch (dsel) {
        case 3:
                div = 0x4;
                break;
        case 2:
        case 1:
                div = 0x2;
                break;
        default:
                div = 0x1;
                break;
        }
        ast->mclk = ref_pll * (num + 2) / ((denum + 2) * (div * 1000));
        return 0;
}

static void ast_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
        struct ast_framebuffer *ast_fb = to_ast_framebuffer(fb);

        drm_gem_object_put_unlocked(ast_fb->obj);
        drm_framebuffer_cleanup(fb);
        kfree(ast_fb);
}

static const struct drm_framebuffer_funcs ast_fb_funcs = {
        .destroy = ast_user_framebuffer_destroy,
};


int ast_framebuffer_init(struct drm_device *dev,
                         struct ast_framebuffer *ast_fb,
                         const struct drm_mode_fb_cmd2 *mode_cmd,
                         struct drm_gem_object *obj)
{
        int ret;

        drm_helper_mode_fill_fb_struct(dev, &ast_fb->base, mode_cmd);
        ast_fb->obj = obj;
        ret = drm_framebuffer_init(dev, &ast_fb->base, &ast_fb_funcs);
        if (ret) {
                DRM_ERROR("framebuffer init failed %d\n", ret);
                return ret;
        }
        return 0;
}

static struct drm_framebuffer *
ast_user_framebuffer_create(struct drm_device *dev,
               struct drm_file *filp,
               const struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct drm_gem_object *obj;
        struct ast_framebuffer *ast_fb;
        int ret;

        obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
        if (obj == NULL)
                return ERR_PTR(-ENOENT);

        ast_fb = kzalloc(sizeof(*ast_fb), GFP_KERNEL);
        if (!ast_fb) {
                drm_gem_object_put_unlocked(obj);
                return ERR_PTR(-ENOMEM);
        }

        ret = ast_framebuffer_init(dev, ast_fb, mode_cmd, obj);
        if (ret) {
                drm_gem_object_put_unlocked(obj);
                kfree(ast_fb);
                return ERR_PTR(ret);
        }
        return &ast_fb->base;
}

static const struct drm_mode_config_funcs ast_mode_funcs = {
        .fb_create = ast_user_framebuffer_create,
};

static u32 ast_get_vram_info(struct drm_device *dev)
{
        struct ast_private *ast = dev->dev_private;
        u8 jreg;
        u32 vram_size;
        ast_open_key(ast);

        vram_size = AST_VIDMEM_DEFAULT_SIZE;
        jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff);
        switch (jreg & 3) {
        case 0: vram_size = AST_VIDMEM_SIZE_8M; break;
        case 1: vram_size = AST_VIDMEM_SIZE_16M; break;
        case 2: vram_size = AST_VIDMEM_SIZE_32M; break;
        case 3: vram_size = AST_VIDMEM_SIZE_64M; break;
        }

        jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x99, 0xff);
        switch (jreg & 0x03) {
        case 1:
                vram_size -= 0x100000;
                break;
        case 2:
                vram_size -= 0x200000;
                break;
        case 3:
                vram_size -= 0x400000;
                break;
        }

        return vram_size;
}

int ast_driver_load(struct drm_device *dev, unsigned long flags)
{
        struct ast_private *ast;
        bool need_post;
        int ret = 0;

        ast = kzalloc(sizeof(struct ast_private), GFP_KERNEL);
        if (!ast)
                return -ENOMEM;

        dev->dev_private = ast;
        ast->dev = dev;

        ast->regs = pci_iomap(dev->pdev, 1, 0);
        if (!ast->regs) {
                ret = -EIO;
                goto out_free;
        }

        /*
         * If we don't have IO space at all, use MMIO now and
         * assume the chip has MMIO enabled by default (rev 0x20
         * and higher).
         */
        if (!(pci_resource_flags(dev->pdev, 2) & IORESOURCE_IO)) {
                DRM_INFO("platform has no IO space, trying MMIO\n");
                ast->ioregs = ast->regs + AST_IO_MM_OFFSET;
        }

        /* "map" IO regs if the above hasn't done so already */
        if (!ast->ioregs) {
                ast->ioregs = pci_iomap(dev->pdev, 2, 0);
                if (!ast->ioregs) {
                        ret = -EIO;
                        goto out_free;
                }
        }

        ast_detect_chip(dev, &need_post);

        if (need_post)
                ast_post_gpu(dev);

        if (ast->chip != AST1180) {
                ret = ast_get_dram_info(dev);
                if (ret)
                        goto out_free;
                ast->vram_size = ast_get_vram_info(dev);
                DRM_INFO("dram MCLK=%u Mhz type=%d bus_width=%d size=%08x\n",
                         ast->mclk, ast->dram_type,
                         ast->dram_bus_width, ast->vram_size);
        }

        ret = ast_mm_init(ast);
        if (ret)
                goto out_free;

        drm_mode_config_init(dev);

        dev->mode_config.funcs = (void *)&ast_mode_funcs;
        dev->mode_config.min_width = 0;
        dev->mode_config.min_height = 0;
        dev->mode_config.preferred_depth = 24;
        dev->mode_config.prefer_shadow = 1;
        dev->mode_config.fb_base = pci_resource_start(ast->dev->pdev, 0);

        if (ast->chip == AST2100 ||
            ast->chip == AST2200 ||
            ast->chip == AST2300 ||
            ast->chip == AST2400 ||
            ast->chip == AST2500 ||
            ast->chip == AST1180) {
                dev->mode_config.max_width = 1920;
                dev->mode_config.max_height = 2048;
        } else {
                dev->mode_config.max_width = 1600;
                dev->mode_config.max_height = 1200;
        }

        ret = ast_mode_init(dev);
        if (ret)
                goto out_free;

        ret = ast_fbdev_init(dev);
        if (ret)
                goto out_free;

        return 0;
out_free:
        kfree(ast);
        dev->dev_private = NULL;
        return ret;
}

void ast_driver_unload(struct drm_device *dev)
{
        struct ast_private *ast = dev->dev_private;

        ast_release_firmware(dev);
        kfree(ast->dp501_fw_addr);
        ast_mode_fini(dev);
        ast_fbdev_fini(dev);
        drm_mode_config_cleanup(dev);

        ast_mm_fini(ast);
        pci_iounmap(dev->pdev, ast->ioregs);
        pci_iounmap(dev->pdev, ast->regs);
        kfree(ast);
}

int ast_gem_create(struct drm_device *dev,
                   u32 size, bool iskernel,
                   struct drm_gem_object **obj)
{
        struct ast_bo *astbo;
        int ret;

        *obj = NULL;

        size = roundup(size, PAGE_SIZE);
        if (size == 0)
                return -EINVAL;

        ret = ast_bo_create(dev, size, 0, 0, &astbo);
        if (ret) {
                if (ret != -ERESTARTSYS)
                        DRM_ERROR("failed to allocate GEM object\n");
                return ret;
        }
        *obj = &astbo->gem;
        return 0;
}

int ast_dumb_create(struct drm_file *file,
                    struct drm_device *dev,
                    struct drm_mode_create_dumb *args)
{
        int ret;
        struct drm_gem_object *gobj;
        u32 handle;

        args->pitch = args->width * ((args->bpp + 7) / 8);
        args->size = args->pitch * args->height;

        ret = ast_gem_create(dev, args->size, false,
                             &gobj);
        if (ret)
                return ret;

        ret = drm_gem_handle_create(file, gobj, &handle);
        drm_gem_object_put_unlocked(gobj);
        if (ret)
                return ret;

        args->handle = handle;
        return 0;
}

static void ast_bo_unref(struct ast_bo **bo)
{
        struct ttm_buffer_object *tbo;

        if ((*bo) == NULL)
                return;

        tbo = &((*bo)->bo);
        ttm_bo_unref(&tbo);
        *bo = NULL;
}

void ast_gem_free_object(struct drm_gem_object *obj)
{
        struct ast_bo *ast_bo = gem_to_ast_bo(obj);

        ast_bo_unref(&ast_bo);
}


static inline u64 ast_bo_mmap_offset(struct ast_bo *bo)
{
        return drm_vma_node_offset_addr(&bo->bo.vma_node);
}
int
ast_dumb_mmap_offset(struct drm_file *file,
                     struct drm_device *dev,
                     uint32_t handle,
                     uint64_t *offset)
{
        struct drm_gem_object *obj;
        struct ast_bo *bo;

        obj = drm_gem_object_lookup(file, handle);
        if (obj == NULL)
                return -ENOENT;

        bo = gem_to_ast_bo(obj);
        *offset = ast_bo_mmap_offset(bo);

        drm_gem_object_put_unlocked(obj);

        return 0;

}