dnfb.c

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#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>

#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/apollohw.h>
#include <linux/fb.h>
#include <linux/module.h>

/* apollo video HW definitions */

/*
 * Control Registers.   IOBASE + $x
 *
 * Note: these are the Memory/IO BASE definitions for a mono card set to the
 * alternate address
 *
 * Control 3A and 3B serve identical functions except that 3A
 * deals with control 1 and 3b deals with Color LUT reg.
 */

#define AP_IOBASE       0x3b0   /* Base address of 1 plane board. */
#define AP_STATUS       isaIO2mem(AP_IOBASE+0)  /* Status register.  Read */
#define AP_WRITE_ENABLE isaIO2mem(AP_IOBASE+0)  /* Write Enable Register Write */
#define AP_DEVICE_ID    isaIO2mem(AP_IOBASE+1)  /* Device ID Register. Read */
#define AP_ROP_1        isaIO2mem(AP_IOBASE+2)  /* Raster Operation reg. Write Word */
#define AP_DIAG_MEM_REQ isaIO2mem(AP_IOBASE+4)  /* Diagnostic Memory Request. Write Word */
#define AP_CONTROL_0    isaIO2mem(AP_IOBASE+8)  /* Control Register 0.  Read/Write */
#define AP_CONTROL_1    isaIO2mem(AP_IOBASE+0xa)    /* Control Register 1.  Read/Write */
#define AP_CONTROL_3A   isaIO2mem(AP_IOBASE+0xe)    /* Control Register 3a. Read/Write */
#define AP_CONTROL_2    isaIO2mem(AP_IOBASE+0xc)    /* Control Register 2. Read/Write */


#define FRAME_BUFFER_START 0x0FA0000
#define FRAME_BUFFER_LEN 0x40000

/* CREG 0 */
#define VECTOR_MODE 0x40    /* 010x.xxxx */
#define DBLT_MODE   0x80    /* 100x.xxxx */
#define NORMAL_MODE 0xE0    /* 111x.xxxx */
#define SHIFT_BITS  0x1F    /* xxx1.1111 */
    /* other bits are Shift value */

/* CREG 1 */
#define AD_BLT      0x80    /* 1xxx.xxxx */
#define NORMAL      0x80 /* 1xxx.xxxx */    /* What is happening here ?? */
#define INVERSE     0x00 /* 0xxx.xxxx */    /* Clearing this reverses the screen */
#define PIX_BLT     0x00    /* 0xxx.xxxx */

#define AD_HIBIT        0x40    /* xIxx.xxxx */

#define ROP_EN          0x10    /* xxx1.xxxx */
#define DST_EQ_SRC      0x00    /* xxx0.xxxx */
#define nRESET_SYNC     0x08    /* xxxx.1xxx */
#define SYNC_ENAB       0x02    /* xxxx.xx1x */

#define BLANK_DISP      0x00    /* xxxx.xxx0 */
#define ENAB_DISP       0x01    /* xxxx.xxx1 */

#define NORM_CREG1      (nRESET_SYNC | SYNC_ENAB | ENAB_DISP)   /* no reset sync */

/* CREG 2 */

/*
 * Following 3 defines are common to 1, 4 and 8 plane.
 */

#define S_DATA_1s   0x00 /* 00xx.xxxx */    /* set source to all 1's -- vector drawing */
#define S_DATA_PIX  0x40 /* 01xx.xxxx */    /* takes source from ls-bits and replicates over 16 bits */
#define S_DATA_PLN  0xC0 /* 11xx.xxxx */    /* normal, each data access =16-bits in
                           one plane of image mem */

/* CREG 3A/CREG 3B */
#       define RESET_CREG 0x80  /* 1000.0000 */

/* ROP REG  -  all one nibble */
/*      ********* NOTE : this is used r0,r1,r2,r3 *********** */
#define ROP(r2,r3,r0,r1) ( (U_SHORT)((r0)|((r1)<<4)|((r2)<<8)|((r3)<<12)) )
#define DEST_ZERO               0x0
#define SRC_AND_DEST    0x1
#define SRC_AND_nDEST   0x2
#define SRC                             0x3
#define nSRC_AND_DEST   0x4
#define DEST                    0x5
#define SRC_XOR_DEST    0x6
#define SRC_OR_DEST             0x7
#define SRC_NOR_DEST    0x8
#define SRC_XNOR_DEST   0x9
#define nDEST                   0xA
#define SRC_OR_nDEST    0xB
#define nSRC                    0xC
#define nSRC_OR_DEST    0xD
#define SRC_NAND_DEST   0xE
#define DEST_ONE                0xF

#define SWAP(A) ((A>>8) | ((A&0xff) <<8))

/* frame buffer operations */

static int dnfb_blank(int blank, struct fb_info *info);
static void dnfb_copyarea(struct fb_info *info, const struct fb_copyarea *area);

static struct fb_ops dn_fb_ops = {
    .owner      = THIS_MODULE,
    .fb_blank   = dnfb_blank,
    .fb_fillrect    = cfb_fillrect,
    .fb_copyarea    = dnfb_copyarea,
    .fb_imageblit   = cfb_imageblit,
};

struct fb_var_screeninfo dnfb_var __devinitdata = {
    .xres       = 1280,
    .yres       = 1024,
    .xres_virtual   = 2048,
    .yres_virtual   = 1024,
    .bits_per_pixel = 1,
    .height     = -1,
    .width      = -1,
    .vmode      = FB_VMODE_NONINTERLACED,
};

static struct fb_fix_screeninfo dnfb_fix __devinitdata = {
    .id     = "Apollo Mono",
    .smem_start = (FRAME_BUFFER_START + IO_BASE),
    .smem_len   = FRAME_BUFFER_LEN,
    .type       = FB_TYPE_PACKED_PIXELS,
    .visual     = FB_VISUAL_MONO10,
    .line_length    = 256,
};

static int dnfb_blank(int blank, struct fb_info *info)
{
    if (blank)
        out_8(AP_CONTROL_3A, 0x0);
    else
        out_8(AP_CONTROL_3A, 0x1);
    return 0;
}

static
void dnfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
{

    int incr, y_delta, pre_read = 0, x_end, x_word_count;
    uint start_mask, end_mask, dest;
    ushort *src, dummy;
    short i, j;

    incr = (area->dy <= area->sy) ? 1 : -1;

    src = (ushort *)(info->screen_base + area->sy * info->fix.line_length +
            (area->sx >> 4));
    dest = area->dy * (info->fix.line_length >> 1) + (area->dx >> 4);

    if (incr > 0) {
        y_delta = (info->fix.line_length * 8) - area->sx - area->width;
        x_end = area->dx + area->width - 1;
        x_word_count = (x_end >> 4) - (area->dx >> 4) + 1;
        start_mask = 0xffff0000 >> (area->dx & 0xf);
        end_mask = 0x7ffff >> (x_end & 0xf);
        out_8(AP_CONTROL_0,
             (((area->dx & 0xf) - (area->sx & 0xf)) % 16) | (0x4 << 5));
        if ((area->dx & 0xf) < (area->sx & 0xf))
            pre_read = 1;
    } else {
        y_delta = -((info->fix.line_length * 8) - area->sx - area->width);
        x_end = area->dx - area->width + 1;
        x_word_count = (area->dx >> 4) - (x_end >> 4) + 1;
        start_mask = 0x7ffff >> (area->dx & 0xf);
        end_mask = 0xffff0000 >> (x_end & 0xf);
        out_8(AP_CONTROL_0,
             ((-((area->sx & 0xf) - (area->dx & 0xf))) % 16) |
             (0x4 << 5));
        if ((area->dx & 0xf) > (area->sx & 0xf))
            pre_read = 1;
    }

    for (i = 0; i < area->height; i++) {

        out_8(AP_CONTROL_3A, 0xc | (dest >> 16));

        if (pre_read) {
            dummy = *src;
            src += incr;
        }

        if (x_word_count) {
            out_8(AP_WRITE_ENABLE, start_mask);
            *src = dest;
            src += incr;
            dest += incr;
            out_8(AP_WRITE_ENABLE, 0);

            for (j = 1; j < (x_word_count - 1); j++) {
                *src = dest;
                src += incr;
                dest += incr;
            }

            out_8(AP_WRITE_ENABLE, start_mask);
            *src = dest;
            dest += incr;
            src += incr;
        } else {
            out_8(AP_WRITE_ENABLE, start_mask | end_mask);
            *src = dest;
            dest += incr;
            src += incr;
        }
        src += (y_delta / 16);
        dest += (y_delta / 16);
    }
    out_8(AP_CONTROL_0, NORMAL_MODE);
}

/*
 * Initialization
 */

static int __devinit dnfb_probe(struct platform_device *dev)
{
    struct fb_info *info;
    int err = 0;

    info = framebuffer_alloc(0, &dev->dev);
    if (!info)
        return -ENOMEM;

    info->fbops = &dn_fb_ops;
    info->fix = dnfb_fix;
    info->var = dnfb_var;
    info->var.red.length = 1;
    info->var.red.offset = 0;
    info->var.green = info->var.blue = info->var.red;
    info->screen_base = (u_char *) info->fix.smem_start;

    err = fb_alloc_cmap(&info->cmap, 2, 0);
    if (err < 0) {
        framebuffer_release(info);
        return err;
    }

    err = register_framebuffer(info);
    if (err < 0) {
        fb_dealloc_cmap(&info->cmap);
        framebuffer_release(info);
        return err;
    }
    platform_set_drvdata(dev, info);

    /* now we have registered we can safely setup the hardware */
    out_8(AP_CONTROL_3A, RESET_CREG);
    out_be16(AP_WRITE_ENABLE, 0x0);
    out_8(AP_CONTROL_0, NORMAL_MODE);
    out_8(AP_CONTROL_1, (AD_BLT | DST_EQ_SRC | NORM_CREG1));
    out_8(AP_CONTROL_2, S_DATA_PLN);
    out_be16(AP_ROP_1, SWAP(0x3));

    printk("apollo frame buffer alive and kicking !\n");
    return err;
}

static struct platform_driver dnfb_driver = {
    .probe  = dnfb_probe,
    .driver = {
        .name   = "dnfb",
    },
};

static struct platform_device dnfb_device = {
    .name   = "dnfb",
};

int __init dnfb_init(void)
{
    int ret;

    if (!MACH_IS_APOLLO)
        return -ENODEV;

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

    ret = platform_driver_register(&dnfb_driver);

    if (!ret) {
        ret = platform_device_register(&dnfb_device);
        if (ret)
            platform_driver_unregister(&dnfb_driver);
    }
    return ret;
}

module_init(dnfb_init);

MODULE_LICENSE("GPL");