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/*

 *  controlfb.c -- frame buffer device for the PowerMac 'control' display

 *

 *  Created 12 July 1998 by Dan Jacobowitz <dan@debian.org>

 *  Copyright (C) 1998 Dan Jacobowitz

 *  Copyright (C) 2001 Takashi Oe

 *

 *  Mmap code by Michel Lanners <mlan@cpu.lu>

 *

 *  Frame buffer structure from:

 *    drivers/video/chipsfb.c -- frame buffer device for

 *    Chips & Technologies 65550 chip.

 *

 *    Copyright (C) 1998 Paul Mackerras

 *

 *    This file is derived from the Powermac "chips" driver:

 *    Copyright (C) 1997 Fabio Riccardi.

 *    And from the frame buffer device for Open Firmware-initialized devices:

 *    Copyright (C) 1997 Geert Uytterhoeven.

 *

 *  Hardware information from:

 *    control.c: Console support for PowerMac "control" display adaptor.

 *    Copyright (C) 1996 Paul Mackerras

 *

 *  Updated to 2.5 framebuffer API by Ben Herrenschmidt

 *  <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>,

 *  and James Simmons <jsimmons@infradead.org>.

 *

 *  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.

 */

#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 <linux/adb.h>

#include <linux/cuda.h>

#include <asm/io.h>

#include <asm/prom.h>

#include <asm/pgtable.h>

#include <asm/btext.h>

#include "macmodes.h"

#include "controlfb.h"

struct fb_par_control {

        int     vmode, cmode;

        int     xres, yres;

        int     vxres, vyres;

        int     xoffset, yoffset;

        int     pitch;

        struct control_regvals  regvals;

        unsigned long sync;

        unsigned char ctrl;

};

#define DIRTY(z) ((x)->z != (y)->z)

#define DIRTY_CMAP(z) (memcmp(&((x)->z), &((y)->z), sizeof((y)->z)))

static inline int PAR_EQUAL(struct fb_par_control *x, struct fb_par_control *y)

{

        int i, results;

        results = 1;

        for (i = 0; i < 3; i++)

                results &= !DIRTY(regvals.clock_params[i]);

        if (!results)

                return 0;

        for (i = 0; i < 16; i++)

                results &= !DIRTY(regvals.regs[i]);

        if (!results)

                return 0;

        return (!DIRTY(cmode) && !DIRTY(xres) && !DIRTY(yres)

                && !DIRTY(vxres) && !DIRTY(vyres));

}

static inline int VAR_MATCH(struct fb_var_screeninfo *x, struct fb_var_screeninfo *y)

{

        return (!DIRTY(bits_per_pixel) && !DIRTY(xres)

                && !DIRTY(yres) && !DIRTY(xres_virtual)

                && !DIRTY(yres_virtual)

                && !DIRTY_CMAP(red) && !DIRTY_CMAP(green) && !DIRTY_CMAP(blue));

}

struct fb_info_control {

        struct fb_info          info;

        struct fb_par_control   par;

        u32                     pseudo_palette[16];

        struct cmap_regs        __iomem *cmap_regs;

        unsigned long           cmap_regs_phys;

        struct control_regs     __iomem *control_regs;

        unsigned long           control_regs_phys;

        unsigned long           control_regs_size;

        __u8                    __iomem *frame_buffer;

        unsigned long           frame_buffer_phys;

        unsigned long           fb_orig_base;

        unsigned long           fb_orig_size;

        int                     control_use_bank2;

        unsigned long           total_vram;

        unsigned char           vram_attr;

};

/* control register access macro */

#define CNTRL_REG(INFO,REG) (&(((INFO)->control_regs->REG).r))

/******************** Prototypes for exported functions ********************/

/*

 * struct fb_ops

 */

static int controlfb_pan_display(struct fb_var_screeninfo *var,

        struct fb_info *info);

static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,

        u_int transp, struct fb_info *info);

static int controlfb_blank(int blank_mode, struct fb_info *info);

static int controlfb_mmap(struct fb_info *info,

        struct vm_area_struct *vma);

static int controlfb_set_par (struct fb_info *info);

static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info);

/******************** Prototypes for internal functions **********************/

static void set_control_clock(unsigned char *params);

static int init_control(struct fb_info_control *p);

static void control_set_hardware(struct fb_info_control *p,

        struct fb_par_control *par);

static int control_of_init(struct device_node *dp);

static void find_vram_size(struct fb_info_control *p);

static int read_control_sense(struct fb_info_control *p);

static int calc_clock_params(unsigned long clk, unsigned char *param);

static int control_var_to_par(struct fb_var_screeninfo *var,

        struct fb_par_control *par, const struct fb_info *fb_info);

static inline void control_par_to_var(struct fb_par_control *par,

        struct fb_var_screeninfo *var);

static void control_init_info(struct fb_info *info, struct fb_info_control *p);

static void control_cleanup(void);

/************************** Internal variables *******************************/

static struct fb_info_control *control_fb;

static int default_vmode __initdata = VMODE_NVRAM;

static int default_cmode __initdata = CMODE_NVRAM;

static struct fb_ops controlfb_ops = {

        .owner          = THIS_MODULE,

        .fb_check_var   = controlfb_check_var,

        .fb_set_par     = controlfb_set_par,

        .fb_setcolreg   = controlfb_setcolreg,

        .fb_pan_display = controlfb_pan_display,

        .fb_blank       = controlfb_blank,

        .fb_mmap        = controlfb_mmap,

        .fb_fillrect    = cfb_fillrect,

        .fb_copyarea    = cfb_copyarea,

        .fb_imageblit   = cfb_imageblit,

};

/********************  The functions for controlfb_ops ********************/

#ifdef MODULE

MODULE_LICENSE("GPL");

int init_module(void)

{

        struct device_node *dp;

        int ret = -ENXIO;

        dp = of_find_node_by_name(NULL, "control");

        if (dp != 0 && !control_of_init(dp))

                ret = 0;

        of_node_put(dp);

        return ret;

}

void cleanup_module(void)

{

        control_cleanup();

}

#endif

/*

 * Checks a var structure

 */

static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info)

{

        struct fb_par_control par;

        int err;

        err = control_var_to_par(var, &par, info);

        if (err)

                return err;

        control_par_to_var(&par, var);

        return 0;

}

/*

 * Applies current var to display

 */

static int controlfb_set_par (struct fb_info *info)

{

        struct fb_info_control *p = (struct fb_info_control *) info;

        struct fb_par_control par;

        int err;

        if((err = control_var_to_par(&info->var, &par, info))) {

                printk (KERN_ERR "controlfb_set_par: error calling"

                                 " control_var_to_par: %d.\n", err);

                return err;

        }

        control_set_hardware(p, &par);

        info->fix.visual = (p->par.cmode == CMODE_8) ?

                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;

        info->fix.line_length = p->par.pitch;

        info->fix.xpanstep = 32 >> p->par.cmode;

        info->fix.ypanstep = 1;

        return 0;

}

/*

 * Set screen start address according to var offset values

 */

static inline void set_screen_start(int xoffset, int yoffset,

        struct fb_info_control *p)

{

        struct fb_par_control *par = &p->par;

        par->xoffset = xoffset;

        par->yoffset = yoffset;

        out_le32(CNTRL_REG(p,start_addr),

                 par->yoffset * par->pitch + (par->xoffset << par->cmode));

}

static int controlfb_pan_display(struct fb_var_screeninfo *var,

                                 struct fb_info *info)

{

        unsigned int xoffset, hstep;

        struct fb_info_control *p = (struct fb_info_control *)info;

        struct fb_par_control *par = &p->par;

        /*

         * make sure start addr will be 32-byte aligned

         */

        hstep = 0x1f >> par->cmode;

        xoffset = (var->xoffset + hstep) & ~hstep;

        if (xoffset+par->xres > par->vxres ||

            var->yoffset+par->yres > par->vyres)

                return -EINVAL;

        set_screen_start(xoffset, var->yoffset, p);

        return 0;

}

/*

 * Private mmap since we want to have a different caching on the framebuffer

 * for controlfb.

 * Note there's no locking in here; it's done in fb_mmap() in fbmem.c.

 */

static int controlfb_mmap(struct fb_info *info,

                       struct vm_area_struct *vma)

{

       unsigned long off, start;

       u32 len;

       off = vma->vm_pgoff << PAGE_SHIFT;

       /* frame buffer memory */

       start = info->fix.smem_start;

       len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.smem_len);

       if (off >= len) {

               /* memory mapped io */

               off -= len;

               if (info->var.accel_flags)

                       return -EINVAL;

               start = info->fix.mmio_start;

               len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.mmio_len);

               pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE|_PAGE_GUARDED;

       } else {

               /* framebuffer */

               pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;

       }

       start &= PAGE_MASK;

       if ((vma->vm_end - vma->vm_start + off) > len)

                return -EINVAL;

       off += start;

       vma->vm_pgoff = off >> PAGE_SHIFT;

       if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,

           vma->vm_end - vma->vm_start, vma->vm_page_prot))

               return -EAGAIN;

       return 0;

}

static int controlfb_blank(int blank_mode, struct fb_info *info)

{

        struct fb_info_control *p = (struct fb_info_control *) info;

        unsigned ctrl;

        ctrl = ld_le32(CNTRL_REG(p,ctrl));

        if (blank_mode > 0)

                switch (blank_mode) {

                case FB_BLANK_VSYNC_SUSPEND:

                        ctrl &= ~3;

                        break;

                case FB_BLANK_HSYNC_SUSPEND:

                        ctrl &= ~0x30;

                        break;

                case FB_BLANK_POWERDOWN:

                        ctrl &= ~0x33;

                        /* fall through */

                case FB_BLANK_NORMAL:

                        ctrl |= 0x400;

                        break;

                default:

                        break;

                }

        else {

                ctrl &= ~0x400;

                ctrl |= 0x33;

        }

        out_le32(CNTRL_REG(p,ctrl), ctrl);

        return 0;

}

static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,

                             u_int transp, struct fb_info *info)

{

        struct fb_info_control *p = (struct fb_info_control *) info;

        __u8 r, g, b;

        if (regno > 255)

                return 1;

        r = red >> 8;

        g = green >> 8;

        b = blue >> 8;

        out_8(&p->cmap_regs->addr, regno);      /* tell clut what addr to fill  */

        out_8(&p->cmap_regs->lut, r);           /* send one color channel at    */

        out_8(&p->cmap_regs->lut, g);           /* a time...                    */

        out_8(&p->cmap_regs->lut, b);

        if (regno < 16) {

                int i;

                switch (p->par.cmode) {

                case CMODE_16:

                        p->pseudo_palette[regno] =

                            (regno << 10) | (regno << 5) | regno;

                        break;

                case CMODE_32:

                        i = (regno << 8) | regno;

                        p->pseudo_palette[regno] = (i << 16) | i;

                        break;

                }

        }

        return 0;

}

/********************  End of controlfb_ops implementation  ******************/

static void set_control_clock(unsigned char *params)

{

#ifdef CONFIG_ADB_CUDA

        struct adb_request req;

        int i;

        for (i = 0; i < 3; ++i) {

                cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,

                             0x50, i + 1, params[i]);

                while (!req.complete)

                        cuda_poll();

        }

#endif  

}

/*

 * finish off the driver initialization and register

 */

static int __init init_control(struct fb_info_control *p)

{

        int full, sense, vmode, cmode, vyres;

        struct fb_var_screeninfo var;

        int rc;

        printk(KERN_INFO "controlfb: ");

        full = p->total_vram == 0x400000;

        /* Try to pick a video mode out of NVRAM if we have one. */

#ifdef CONFIG_NVRAM

        if (default_cmode == CMODE_NVRAM){

                cmode = nvram_read_byte(NV_CMODE);

                if(cmode < CMODE_8 || cmode > CMODE_32)

                        cmode = CMODE_8;

        } else

#endif

                cmode=default_cmode;

#ifdef CONFIG_NVRAM

        if (default_vmode == VMODE_NVRAM) {

                vmode = nvram_read_byte(NV_VMODE);

                if (vmode < 1 || vmode > VMODE_MAX ||

                    control_mac_modes[vmode - 1].m[full] < cmode) {

                        sense = read_control_sense(p);

                        printk("Monitor sense value = 0x%x, ", sense);

                        vmode = mac_map_monitor_sense(sense);

                        if (control_mac_modes[vmode - 1].m[full] < cmode)

                                vmode = VMODE_640_480_60;

                }

        } else

#endif

        {

                vmode=default_vmode;

                if (control_mac_modes[vmode - 1].m[full] < cmode) {

                        if (cmode > CMODE_8)

                                cmode--;

                        else

                                vmode = VMODE_640_480_60;

                }

        }

        /* Initialize info structure */

        control_init_info(&p->info, p);

        /* Setup default var */

        if (mac_vmode_to_var(vmode, cmode, &var) < 0) {

                /* This shouldn't happen! */

                printk("mac_vmode_to_var(%d, %d,) failed\n", vmode, cmode);

try_again:

                vmode = VMODE_640_480_60;

                cmode = CMODE_8;

                if (mac_vmode_to_var(vmode, cmode, &var) < 0) {

                        printk(KERN_ERR "controlfb: mac_vmode_to_var() failed\n");

                        return -ENXIO;

                }

                printk(KERN_INFO "controlfb: ");

        }

        printk("using video mode %d and color mode %d.\n", vmode, cmode);

        vyres = (p->total_vram - CTRLFB_OFF) / (var.xres << cmode);

        if (vyres > var.yres)

                var.yres_virtual = vyres;

        /* Apply default var */

        var.activate = FB_ACTIVATE_NOW;

        rc = fb_set_var(&p->info, &var);

        if (rc && (vmode != VMODE_640_480_60 || cmode != CMODE_8))

                goto try_again;

        /* Register with fbdev layer */

        if (register_framebuffer(&p->info) < 0)

                return -ENXIO;

        printk(KERN_INFO "fb%d: control display adapter\n", p->info.node);

        return 0;

}

#define RADACAL_WRITE(a,d) \

        out_8(&p->cmap_regs->addr, (a)); \

        out_8(&p->cmap_regs->dat,   (d))

/* Now how about actually saying, Make it so! */

/* Some things in here probably don't need to be done each time. */

static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par)

{

        struct control_regvals  *r;

        volatile struct preg    __iomem *rp;

        int                     i, cmode;

        if (PAR_EQUAL(&p->par, par)) {

                /*

                 * check if only xoffset or yoffset differs.

                 * this prevents flickers in typical VT switch case.

                 */

                if (p->par.xoffset != par->xoffset ||

                    p->par.yoffset != par->yoffset)

                        set_screen_start(par->xoffset, par->yoffset, p);

                return;

        }

        p->par = *par;

        cmode = p->par.cmode;

        r = &par->regvals;

        /* Turn off display */

        out_le32(CNTRL_REG(p,ctrl), 0x400 | par->ctrl);

        set_control_clock(r->clock_params);

        RADACAL_WRITE(0x20, r->radacal_ctrl);

        RADACAL_WRITE(0x21, p->control_use_bank2 ? 0 : 1);

        RADACAL_WRITE(0x10, 0);

        RADACAL_WRITE(0x11, 0);

        rp = &p->control_regs->vswin;

        for (i = 0; i < 16; ++i, ++rp)

                out_le32(&rp->r, r->regs[i]);

        out_le32(CNTRL_REG(p,pitch), par->pitch);

        out_le32(CNTRL_REG(p,mode), r->mode);

        out_le32(CNTRL_REG(p,vram_attr), p->vram_attr);

        out_le32(CNTRL_REG(p,start_addr), par->yoffset * par->pitch

                 + (par->xoffset << cmode));

        out_le32(CNTRL_REG(p,rfrcnt), 0x1e5);

        out_le32(CNTRL_REG(p,intr_ena), 0);

        /* Turn on display */

        out_le32(CNTRL_REG(p,ctrl), par->ctrl);

#ifdef CONFIG_BOOTX_TEXT

        btext_update_display(p->frame_buffer_phys + CTRLFB_OFF,

                             p->par.xres, p->par.yres,

                             (cmode == CMODE_32? 32: cmode == CMODE_16? 16: 8),

                             p->par.pitch);

#endif /* CONFIG_BOOTX_TEXT */

}

/*

 * Parse user speficied options (`video=controlfb:')

 */

static void __init control_setup(char *options)

{

        char *this_opt;

        if (!options || !*options)

                return;

        while ((this_opt = strsep(&options, ",")) != NULL) {

                if (!strncmp(this_opt, "vmode:", 6)) {

                        int vmode = simple_strtoul(this_opt+6, NULL, 0);

                        if (vmode > 0 && vmode <= VMODE_MAX &&

                            control_mac_modes[vmode - 1].m[1] >= 0)

                                default_vmode = vmode;

                } else if (!strncmp(this_opt, "cmode:", 6)) {

                        int depth = simple_strtoul(this_opt+6, NULL, 0);

                        switch (depth) {

                         case CMODE_8:

                         case CMODE_16:

                         case CMODE_32:

                                default_cmode = depth;

                                break;

                         case 8:

                                default_cmode = CMODE_8;

                                break;

                         case 15:

                         case 16:

                                default_cmode = CMODE_16;

                                break;

                         case 24:

                         case 32:

                                default_cmode = CMODE_32;

                                break;

                        }

                }

        }

}

static int __init control_init(void)

{

        struct device_node *dp;

        char *option = NULL;

        int ret = -ENXIO;

        if (fb_get_options("controlfb", &option))

                return -ENODEV;

        control_setup(option);

        dp = of_find_node_by_name(NULL, "control");

        if (dp != 0 && !control_of_init(dp))

                ret = 0;

        of_node_put(dp);

        return ret;

}

module_init(control_init);

/* Work out which banks of VRAM we have installed. */

/* danj: I guess the card just ignores writes to nonexistant VRAM... */

static void __init find_vram_size(struct fb_info_control *p)

{

        int bank1, bank2;

        /*

         * Set VRAM in 2MB (bank 1) mode

         * VRAM Bank 2 will be accessible through offset 0x600000 if present

         * and VRAM Bank 1 will not respond at that offset even if present

         */

        out_le32(CNTRL_REG(p,vram_attr), 0x31);

        out_8(&p->frame_buffer[0x600000], 0xb3);

        out_8(&p->frame_buffer[0x600001], 0x71);

        asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0x600000])

                                        : "memory" );

        mb();

        asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0x600000])

                                        : "memory" );

        mb();

        bank2 = (in_8(&p->frame_buffer[0x600000]) == 0xb3)

                && (in_8(&p->frame_buffer[0x600001]) == 0x71);

        /*

         * Set VRAM in 2MB (bank 2) mode

         * VRAM Bank 1 will be accessible through offset 0x000000 if present

         * and VRAM Bank 2 will not respond at that offset even if present

         */

        out_le32(CNTRL_REG(p,vram_attr), 0x39);

        out_8(&p->frame_buffer[0], 0x5a);

        out_8(&p->frame_buffer[1], 0xc7);

        asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0])

                                        : "memory" );

        mb();

        asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0])

                                        : "memory" );

        mb();