/*
 *  linux/drivers/video/igafb.c -- Frame buffer device for IGA 1682
 *
 *      Copyright (C) 1998  Vladimir Roganov and Gleb Raiko
 *
 *  This driver is partly based on the Frame buffer device for ATI Mach64
 *  and partially on VESA-related code.
 *
 *      Copyright (C) 1997-1998  Geert Uytterhoeven
 *      Copyright (C) 1998  Bernd Harries
 *      Copyright (C) 1998  Eddie C. Dost  (ecd@skynet.be)
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License. See the file COPYING in the main directory of this archive for
 *  more details.
 */

/******************************************************************************

  TODO:
       Despite of IGA Card has advanced graphic acceleration, 
       initial version is almost dummy and does not support it.
       Support for video modes and acceleration must be added
       together with accelerated X-Windows driver implementation.

       Most important thing at this moment is that we have working
       JavaEngine1  console & X  with new console interface.

******************************************************************************/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/nvram.h>

#include <asm/io.h>

#ifdef CONFIG_SPARC
#include <asm/prom.h>
#include <asm/pcic.h>
#endif

#include <video/iga.h>

struct pci_mmap_map {
    unsigned long voff;
    unsigned long poff;
    unsigned long size;
    unsigned long prot_flag;
    unsigned long prot_mask;
};

struct iga_par {
        struct pci_mmap_map *mmap_map;
        unsigned long frame_buffer_phys;
        unsigned long io_base;
};

struct fb_info fb_info;

struct fb_fix_screeninfo igafb_fix __initdata = {
        .id             = "IGA 1682",
        .type           = FB_TYPE_PACKED_PIXELS,
        .mmio_len       = 1000
};

struct fb_var_screeninfo default_var = {
        /* 640x480, 60 Hz, Non-Interlaced (25.175 MHz dotclock) */
        .xres           = 640,
        .yres           = 480,
        .xres_virtual   = 640,
        .yres_virtual   = 480,
        .bits_per_pixel = 8,
        .red            = {0, 8, 0 },
        .green          = {0, 8, 0 },
        .blue           = {0, 8, 0 },
        .height         = -1,
        .width          = -1,
        .accel_flags    = FB_ACCEL_NONE,
        .pixclock       = 39722,
        .left_margin    = 48,
        .right_margin   = 16,
        .upper_margin   = 33,
        .lower_margin   = 10,
        .hsync_len      = 96,
        .vsync_len      = 2,
        .vmode          = FB_VMODE_NONINTERLACED
};

#ifdef CONFIG_SPARC
struct fb_var_screeninfo default_var_1024x768 __initdata = {
        /* 1024x768, 75 Hz, Non-Interlaced (78.75 MHz dotclock) */
        .xres           = 1024,
        .yres           = 768,
        .xres_virtual   = 1024,
        .yres_virtual   = 768,
        .bits_per_pixel = 8,
        .red            = {0, 8, 0 },
        .green          = {0, 8, 0 },
        .blue           = {0, 8, 0 },
        .height         = -1,
        .width          = -1,
        .accel_flags    = FB_ACCEL_NONE,
        .pixclock       = 12699,
        .left_margin    = 176,
        .right_margin   = 16,
        .upper_margin   = 28,
        .lower_margin   = 1,
        .hsync_len      = 96,
        .vsync_len      = 3,
        .vmode          = FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
};

struct fb_var_screeninfo default_var_1152x900 __initdata = {
        /* 1152x900, 76 Hz, Non-Interlaced (110.0 MHz dotclock) */
        .xres           = 1152,
        .yres           = 900,
        .xres_virtual   = 1152,
        .yres_virtual   = 900,
        .bits_per_pixel = 8,
        .red            = { 0, 8, 0 },
        .green          = { 0, 8, 0 },
        .blue           = { 0, 8, 0 },
        .height         = -1,
        .width          = -1,
        .accel_flags    = FB_ACCEL_NONE,
        .pixclock       = 9091,
        .left_margin    = 234,
        .right_margin   = 24,
        .upper_margin   = 34,
        .lower_margin   = 3,
        .hsync_len      = 100,
        .vsync_len      = 3,
        .vmode          = FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
};

struct fb_var_screeninfo default_var_1280x1024 __initdata = {
        /* 1280x1024, 75 Hz, Non-Interlaced (135.00 MHz dotclock) */
        .xres           = 1280,
        .yres           = 1024,
        .xres_virtual   = 1280,
        .yres_virtual   = 1024,
        .bits_per_pixel = 8,
        .red            = {0, 8, 0 }, 
        .green          = {0, 8, 0 },
        .blue           = {0, 8, 0 },
        .height         = -1,
        .width          = -1,
        .accel_flags    = 0,
        .pixclock       = 7408,
        .left_margin    = 248,
        .right_margin   = 16,
        .upper_margin   = 38,
        .lower_margin   = 1,
        .hsync_len      = 144,
        .vsync_len      = 3,
        .vmode          = FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
};

/*
 *   Memory-mapped I/O functions for Sparc PCI
 *
 * On sparc we happen to access I/O with memory mapped functions too.
 */ 
#define pci_inb(par, reg)        readb(par->io_base+(reg))
#define pci_outb(par, val, reg)  writeb(val, par->io_base+(reg))

static inline unsigned int iga_inb(struct iga_par *par, unsigned int reg,
                                   unsigned int idx)
{
        pci_outb(par, idx, reg);
        return pci_inb(par, reg + 1);
}

static inline void iga_outb(struct iga_par *par, unsigned char val,
                            unsigned int reg, unsigned int idx )
{
        pci_outb(par, idx, reg);
        pci_outb(par, val, reg+1);
}

#endif /* CONFIG_SPARC */

/*
 *  Very important functionality for the JavaEngine1 computer:
 *  make screen border black (usign special IGA registers) 
 */
static void iga_blank_border(struct iga_par *par)
{
        int i;
#if 0
        /*
         * PROM does this for us, so keep this code as a reminder
         * about required read from 0x3DA and writing of 0x20 in the end.
         */
        (void) pci_inb(par, 0x3DA);             /* required for every access */
        pci_outb(par, IGA_IDX_VGA_OVERSCAN, IGA_ATTR_CTL);
        (void) pci_inb(par, IGA_ATTR_CTL+1);
        pci_outb(par, 0x38, IGA_ATTR_CTL);
        pci_outb(par, 0x20, IGA_ATTR_CTL);      /* re-enable visual */
#endif
        /*
         * This does not work as it was designed because the overscan
         * color is looked up in the palette. Therefore, under X11
         * overscan changes color.
         */
        for (i=0; i < 3; i++)
                iga_outb(par, 0, IGA_EXT_CNTRL, IGA_IDX_OVERSCAN_COLOR + i);
}

#ifdef CONFIG_SPARC
static int igafb_mmap(struct fb_info *info,
                      struct vm_area_struct *vma)
{
        struct iga_par *par = (struct iga_par *)info->par;
        unsigned int size, page, map_size = 0;
        unsigned long map_offset = 0;
        int i;

        if (!par->mmap_map)
                return -ENXIO;

        size = vma->vm_end - vma->vm_start;

        /* Each page, see which map applies */
        for (page = 0; page < size; ) {
                map_size = 0;
                for (i = 0; par->mmap_map[i].size; i++) {
                        unsigned long start = par->mmap_map[i].voff;
                        unsigned long end = start + par->mmap_map[i].size;
                        unsigned long offset = (vma->vm_pgoff << PAGE_SHIFT) + page;

                        if (start > offset)
                                continue;
                        if (offset >= end)
                                continue;

                        map_size = par->mmap_map[i].size - (offset - start);
                        map_offset = par->mmap_map[i].poff + (offset - start);
                        break;
                }
                if (!map_size) {
                        page += PAGE_SIZE;
                        continue;
                }
                if (page + map_size > size)
                        map_size = size - page;

                pgprot_val(vma->vm_page_prot) &= ~(par->mmap_map[i].prot_mask);
                pgprot_val(vma->vm_page_prot) |= par->mmap_map[i].prot_flag;

                if (remap_pfn_range(vma, vma->vm_start + page,
                        map_offset >> PAGE_SHIFT, map_size, vma->vm_page_prot))
                        return -EAGAIN;

                page += map_size;
        }

        if (!map_size)
                return -EINVAL;

        vma->vm_flags |= VM_IO;
        return 0;
}
#endif /* CONFIG_SPARC */

static int igafb_setcolreg(unsigned regno, unsigned red, unsigned green,
                           unsigned blue, unsigned transp,
                           struct fb_info *info)
{
        /*
         *  Set a single color register. The values supplied are
         *  already rounded down to the hardware's capabilities
         *  (according to the entries in the `var' structure). Return
         *  != 0 for invalid regno.
         */
        struct iga_par *par = (struct iga_par *)info->par;

        if (regno >= info->cmap.len)
                return 1;

        pci_outb(par, regno, DAC_W_INDEX);
        pci_outb(par, red,   DAC_DATA);
        pci_outb(par, green, DAC_DATA);
        pci_outb(par, blue,  DAC_DATA);

        if (regno < 16) {
                switch (info->var.bits_per_pixel) {
                case 16:
                        ((u16*)(info->pseudo_palette))[regno] = 
                                (regno << 10) | (regno << 5) | regno;
                        break;
                case 24:
                        ((u32*)(info->pseudo_palette))[regno] = 
                                (regno << 16) | (regno << 8) | regno;
                break;
                case 32:
                        { int i;
                        i = (regno << 8) | regno;
                        ((u32*)(info->pseudo_palette))[regno] = (i << 16) | i;
                        }
                        break;
                }
        }
        return 0;
}

/*
 * Framebuffer option structure
 */
static struct fb_ops igafb_ops = {
        .owner          = THIS_MODULE,
        .fb_setcolreg   = igafb_setcolreg,
        .fb_fillrect    = cfb_fillrect,
        .fb_copyarea    = cfb_copyarea,
        .fb_imageblit   = cfb_imageblit,
#ifdef CONFIG_SPARC
        .fb_mmap        = igafb_mmap,
#endif
};

static int __init iga_init(struct fb_info *info, struct iga_par *par)
{
        char vramsz = iga_inb(par, IGA_EXT_CNTRL, IGA_IDX_EXT_BUS_CNTL) 
                                                         & MEM_SIZE_ALIAS;
        int video_cmap_len;

        switch (vramsz) {
        case MEM_SIZE_1M:
                info->fix.smem_len = 0x100000;
                break;
        case MEM_SIZE_2M:
                info->fix.smem_len = 0x200000;
                break;
        case MEM_SIZE_4M:
        case MEM_SIZE_RESERVED:
                info->fix.smem_len = 0x400000;
                break;
        }

        if (info->var.bits_per_pixel > 8) 
                video_cmap_len = 16;
        else 
                video_cmap_len = 256;

        info->fbops = &igafb_ops;
        info->flags = FBINFO_DEFAULT;

        fb_alloc_cmap(&info->cmap, video_cmap_len, 0);

        if (register_framebuffer(info) < 0)
                return 0;

        printk("fb%d: %s frame buffer device at 0x%08lx [%dMB VRAM]\n",
               info->node, info->fix.id, 
               par->frame_buffer_phys, info->fix.smem_len >> 20);

        iga_blank_border(par); 
        return 1;
}

int __init igafb_init(void)
{
        struct fb_info *info;
        struct pci_dev *pdev;
        struct iga_par *par;
        unsigned long addr;
        int size, iga2000 = 0;

        if (fb_get_options("igafb", NULL))
                return -ENODEV;

        pdev = pci_get_device(PCI_VENDOR_ID_INTERG,
                               PCI_DEVICE_ID_INTERG_1682, 0);
        if (pdev == NULL) {
                /*
                 * XXX We tried to use cyber2000fb.c for IGS 2000.
                 * But it does not initialize the chip in JavaStation-E, alas.
                 */
                pdev = pci_get_device(PCI_VENDOR_ID_INTERG, 0x2000, 0);
                if(pdev == NULL) {
                        return -ENXIO;
                }
                iga2000 = 1;
        }
        /* We leak a reference here but as it cannot be unloaded this is
           fine. If you write unload code remember to free it in unload */
        
        size = sizeof(struct iga_par) + sizeof(u32)*16;

        info = framebuffer_alloc(size, &pdev->dev);
        if (!info) {
                printk("igafb_init: can't alloc fb_info\n");
                 pci_dev_put(pdev);
                return -ENOMEM;
        }

        par = info->par;

        if ((addr = pdev->resource[0].start) == 0) {
                printk("igafb_init: no memory start\n");
                kfree(info);
                pci_dev_put(pdev);
                return -ENXIO;
        }

        if ((info->screen_base = ioremap(addr, 1024*1024*2)) == 0) {
                printk("igafb_init: can't remap %lx[2M]\n", addr);
                kfree(info);
                pci_dev_put(pdev);
                return -ENXIO;
        }

        par->frame_buffer_phys = addr & PCI_BASE_ADDRESS_MEM_MASK;

#ifdef CONFIG_SPARC
        /*
         * The following is sparc specific and this is why:
         *
         * IGS2000 has its I/O memory mapped and we want
         * to generate memory cycles on PCI, e.g. do ioremap(),
         * then readb/writeb() as in Documentation/IO-mapping.txt.
         *
         * IGS1682 is more traditional, it responds to PCI I/O
         * cycles, so we want to access it with inb()/outb().
         *
         * On sparc, PCIC converts CPU memory access within
         * phys window 0x3000xxxx into PCI I/O cycles. Therefore
         * we may use readb/writeb to access them with IGS1682.
         *
         * We do not take io_base_phys from resource[n].start
         * on IGS1682 because that chip is BROKEN. It does not
         * have a base register for I/O. We just "know" what its
         * I/O addresses are.
         */
        if (iga2000) {
                igafb_fix.mmio_start = par->frame_buffer_phys | 0x00800000;
        } else {
                igafb_fix.mmio_start = 0x30000000;      /* XXX */
        }
        if ((par->io_base = (int) ioremap(igafb_fix.mmio_start, igafb_fix.smem_len)) == 0) {
                printk("igafb_init: can't remap %lx[4K]\n", igafb_fix.mmio_start);
                iounmap((void *)info->screen_base);
                kfree(info);
                pci_dev_put(pdev);
                return -ENXIO;
        }

        /*
         * Figure mmap addresses from PCI config space.
         * We need two regions: for video memory and for I/O ports.
         * Later one can add region for video coprocessor registers.
         * However, mmap routine loops until size != 0, so we put
         * one additional region with size == 0. 
         */

        par->mmap_map = kzalloc(4 * sizeof(*par->mmap_map), GFP_ATOMIC);
        if (!par->mmap_map) {
                printk("igafb_init: can't alloc mmap_map\n");
                iounmap((void *)par->io_base);
                iounmap(info->screen_base);
                kfree(info);
                pci_dev_put(pdev);
                return -ENOMEM;
        }

        /*
         * Set default vmode and cmode from PROM properties.
         */
        {
                struct device_node *dp = pci_device_to_OF_node(pdev);
                int node = dp->node;
                int width = prom_getintdefault(node, "width", 1024);
                int height = prom_getintdefault(node, "height", 768);
                int depth = prom_getintdefault(node, "depth", 8);
                switch (width) {
                    case 1024:
                        if (height == 768)
                            default_var = default_var_1024x768;
                        break;
                    case 1152:
                        if (height == 900)
                            default_var = default_var_1152x900;
                        break;
                    case 1280:
                        if (height == 1024)
                            default_var = default_var_1280x1024;
                        break;
                    default:
                        break;
                }

                switch (depth) {
                    case 8:
                        default_var.bits_per_pixel = 8;
                        break;
                    case 16:
                        default_var.bits_per_pixel = 16;
                        break;
                    case 24:
                        default_var.bits_per_pixel = 24;
                        break;
                    case 32:
                        default_var.bits_per_pixel = 32;
                        break;
                    default:
                        break;
                }
            }

#endif
        igafb_fix.smem_start = (unsigned long) info->screen_base;
        igafb_fix.line_length = default_var.xres*(default_var.bits_per_pixel/8);
        igafb_fix.visual = default_var.bits_per_pixel <= 8 ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;

        info->var = default_var;
        info->fix = igafb_fix;
        info->pseudo_palette = (void *)(par + 1);

        if (!iga_init(info, par)) {
                iounmap((void *)par->io_base);
                iounmap(info->screen_base);
                kfree(par->mmap_map);
                kfree(info);
        }

#ifdef CONFIG_SPARC
            /*
             * Add /dev/fb mmap values.
             */
            
            /* First region is for video memory */
            par->mmap_map[0].voff = 0x0;  
            par->mmap_map[0].poff = par->frame_buffer_phys & PAGE_MASK;
            par->mmap_map[0].size = info->fix.smem_len & PAGE_MASK;
            par->mmap_map[0].prot_mask = SRMMU_CACHE;
            par->mmap_map[0].prot_flag = SRMMU_WRITE;

            /* Second region is for I/O ports */
            par->mmap_map[1].voff = par->frame_buffer_phys & PAGE_MASK;
            par->mmap_map[1].poff = info->fix.smem_start & PAGE_MASK;
            par->mmap_map[1].size = PAGE_SIZE * 2; /* X wants 2 pages */
            par->mmap_map[1].prot_mask = SRMMU_CACHE;
            par->mmap_map[1].prot_flag = SRMMU_WRITE;
#endif /* CONFIG_SPARC */

        return 0;
}

int __init igafb_setup(char *options)
{
    char *this_opt;

    if (!options || !*options)
        return 0;

    while ((this_opt = strsep(&options, ",")) != NULL) {
    }
    return 0;
}

module_init(igafb_init);
MODULE_LICENSE("GPL");
static struct pci_device_id igafb_pci_tbl[] __devinitdata = {
        { PCI_VENDOR_ID_INTERG, PCI_DEVICE_ID_INTERG_1682,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        { }
};

MODULE_DEVICE_TABLE(pci, igafb_pci_tbl);