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linux-next/drivers/video/dnfb.c
Geert Uytterhoeven d649770087 m68k: dnfb doesnt check for Apollo 
The Apollo frame buffer device driver (dnfb) doesn't check whether it's
actually running on Apollo hardware, causing a crash if it isn't.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-18 13:28:49 -07:00

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#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <asm/setup.h>
#include <asm/system.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");
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