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linux/drivers/video/hpfb.c
Bjorn Helgaas e51c01b084 [PATCH] hp300: fix driver_register() return handling, remove dio_module_init() 
Remove the assumption that driver_register() returns the number of devices
bound to the driver.  In fact, it returns zero for success or a negative
error value.

dio_module_init() used the device count to automatically unregister and
unload drivers that found no devices.  That might have worked at one time,
but has been broken for some time because dio_register_driver() returned
either a negative error or a positive count (never zero).  So it could only
unregister on failure, when it's not needed anyway.

This functionality could be resurrected in individual drivers by counting
devices in their .probe() methods.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Philip Blundell <philb@gnu.org>
Cc: Jochen Friedrich <jochen@scram.de>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-25 08:22:53 -08:00

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/*
* HP300 Topcat framebuffer support (derived from macfb of all things)
* Phil Blundell <philb@gnu.org> 1998
* DIO-II, colour map and Catseye support by
* Kars de Jong <jongk@linux-m68k.org>, May 2004.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/fb.h>
#include <linux/dio.h>
#include <asm/io.h>
#include <asm/uaccess.h>
static struct fb_info fb_info = {
.fix = {
.id = "HP300 ",
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_PSEUDOCOLOR,
.accel = FB_ACCEL_NONE,
}
};
static unsigned long fb_regs;
static unsigned char fb_bitmask;
#define TC_NBLANK 0x4080
#define TC_WEN 0x4088
#define TC_REN 0x408c
#define TC_FBEN 0x4090
#define TC_PRR 0x40ea
/* These defines match the X window system */
#define RR_CLEAR 0x0
#define RR_COPY 0x3
#define RR_NOOP 0x5
#define RR_XOR 0x6
#define RR_INVERT 0xa
#define RR_COPYINVERTED 0xc
#define RR_SET 0xf
/* blitter regs */
#define BUSY 0x4044
#define WMRR 0x40ef
#define SOURCE_X 0x40f2
#define SOURCE_Y 0x40f6
#define DEST_X 0x40fa
#define DEST_Y 0x40fe
#define WHEIGHT 0x4106
#define WWIDTH 0x4102
#define WMOVE 0x409c
static struct fb_var_screeninfo hpfb_defined = {
.red = {
.length = 8,
},
.green = {
.length = 8,
},
.blue = {
.length = 8,
},
.activate = FB_ACTIVATE_NOW,
.height = -1,
.width = -1,
.vmode = FB_VMODE_NONINTERLACED,
};
static int hpfb_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp,
struct fb_info *info)
{
/* use MSBs */
unsigned char _red =red>>8;
unsigned char _green=green>>8;
unsigned char _blue =blue>>8;
unsigned char _regno=regno;
/*
* 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.
*/
if (regno >= info->cmap.len)
return 1;
while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
out_be16(fb_regs + 0x60ba, 0xff);
out_be16(fb_regs + 0x60b2, _red);
out_be16(fb_regs + 0x60b4, _green);
out_be16(fb_regs + 0x60b6, _blue);
out_be16(fb_regs + 0x60b8, ~_regno);
out_be16(fb_regs + 0x60f0, 0xff);
udelay(100);
while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
out_be16(fb_regs + 0x60b2, 0);
out_be16(fb_regs + 0x60b4, 0);
out_be16(fb_regs + 0x60b6, 0);
out_be16(fb_regs + 0x60b8, 0);
return 0;
}
/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
static int hpfb_blank(int blank, struct fb_info *info)
{
out_8(fb_regs + TC_NBLANK, (blank ? 0x00 : fb_bitmask));
return 0;
}
static void topcat_blit(int x0, int y0, int x1, int y1, int w, int h, int rr)
{
if (rr >= 0) {
while (in_8(fb_regs + BUSY) & fb_bitmask)
;
}
out_8(fb_regs + TC_FBEN, fb_bitmask);
if (rr >= 0) {
out_8(fb_regs + TC_WEN, fb_bitmask);
out_8(fb_regs + WMRR, rr);
}
out_be16(fb_regs + SOURCE_X, x0);
out_be16(fb_regs + SOURCE_Y, y0);
out_be16(fb_regs + DEST_X, x1);
out_be16(fb_regs + DEST_Y, y1);
out_be16(fb_regs + WWIDTH, w);
out_be16(fb_regs + WHEIGHT, h);
out_8(fb_regs + WMOVE, fb_bitmask);
}
static void hpfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
{
topcat_blit(area->sx, area->sy, area->dx, area->dy, area->width, area->height, RR_COPY);
}
static void hpfb_fillrect(struct fb_info *p, const struct fb_fillrect *region)
{
u8 clr;
clr = region->color & 0xff;
while (in_8(fb_regs + BUSY) & fb_bitmask)
;
/* Foreground */
out_8(fb_regs + TC_WEN, fb_bitmask & clr);
out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_SET : RR_INVERT));
/* Background */
out_8(fb_regs + TC_WEN, fb_bitmask & ~clr);
out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_CLEAR : RR_NOOP));
topcat_blit(region->dx, region->dy, region->dx, region->dy, region->width, region->height, -1);
}
static int hpfb_sync(struct fb_info *info)
{
/*
* Since we also access the framebuffer directly, we have to wait
* until the block mover is finished
*/
while (in_8(fb_regs + BUSY) & fb_bitmask)
;
out_8(fb_regs + TC_WEN, fb_bitmask);
out_8(fb_regs + TC_PRR, RR_COPY);
out_8(fb_regs + TC_FBEN, fb_bitmask);
return 0;
}
static struct fb_ops hpfb_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = hpfb_setcolreg,
.fb_blank = hpfb_blank,
.fb_fillrect = hpfb_fillrect,
.fb_copyarea = hpfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_sync = hpfb_sync,
};
/* Common to all HP framebuffers */
#define HPFB_FBWMSB 0x05 /* Frame buffer width */
#define HPFB_FBWLSB 0x07
#define HPFB_FBHMSB 0x09 /* Frame buffer height */
#define HPFB_FBHLSB 0x0b
#define HPFB_DWMSB 0x0d /* Display width */
#define HPFB_DWLSB 0x0f
#define HPFB_DHMSB 0x11 /* Display height */
#define HPFB_DHLSB 0x13
#define HPFB_NUMPLANES 0x5b /* Number of colour planes */
#define HPFB_FBOMSB 0x5d /* Frame buffer offset */
#define HPFB_FBOLSB 0x5f
static int __init hpfb_init_one(unsigned long phys_base, unsigned long virt_base)
{
unsigned long fboff, fb_width, fb_height, fb_start;
fb_regs = virt_base;
fboff = (in_8(fb_regs + HPFB_FBOMSB) << 8) | in_8(fb_regs + HPFB_FBOLSB);
fb_info.fix.smem_start = (in_8(fb_regs + fboff) << 16);
if (phys_base >= DIOII_BASE) {
fb_info.fix.smem_start += phys_base;
}
if (DIO_SECID(fb_regs) != DIO_ID2_TOPCAT) {
/* This is the magic incantation the HP X server uses to make Catseye boards work. */
while (in_be16(fb_regs+0x4800) & 1)
;
out_be16(fb_regs+0x4800, 0); /* Catseye status */
out_be16(fb_regs+0x4510, 0); /* VB */
out_be16(fb_regs+0x4512, 0); /* TCNTRL */
out_be16(fb_regs+0x4514, 0); /* ACNTRL */
out_be16(fb_regs+0x4516, 0); /* PNCNTRL */
out_be16(fb_regs+0x4206, 0x90); /* RUG Command/Status */
out_be16(fb_regs+0x60a2, 0); /* Overlay Mask */
out_be16(fb_regs+0x60bc, 0); /* Ram Select */
}
/*
* Fill in the available video resolution
*/
fb_width = (in_8(fb_regs + HPFB_FBWMSB) << 8) | in_8(fb_regs + HPFB_FBWLSB);
fb_info.fix.line_length = fb_width;
fb_height = (in_8(fb_regs + HPFB_FBHMSB) << 8) | in_8(fb_regs + HPFB_FBHLSB);
fb_info.fix.smem_len = fb_width * fb_height;
fb_start = (unsigned long)ioremap_writethrough(fb_info.fix.smem_start,
fb_info.fix.smem_len);
hpfb_defined.xres = (in_8(fb_regs + HPFB_DWMSB) << 8) | in_8(fb_regs + HPFB_DWLSB);
hpfb_defined.yres = (in_8(fb_regs + HPFB_DHMSB) << 8) | in_8(fb_regs + HPFB_DHLSB);
hpfb_defined.xres_virtual = hpfb_defined.xres;
hpfb_defined.yres_virtual = hpfb_defined.yres;
hpfb_defined.bits_per_pixel = in_8(fb_regs + HPFB_NUMPLANES);
printk(KERN_INFO "hpfb: framebuffer at 0x%lx, mapped to 0x%lx, size %dk\n",
fb_info.fix.smem_start, fb_start, fb_info.fix.smem_len/1024);
printk(KERN_INFO "hpfb: mode is %dx%dx%d, linelength=%d\n",
hpfb_defined.xres, hpfb_defined.yres, hpfb_defined.bits_per_pixel, fb_info.fix.line_length);
/*
* Give the hardware a bit of a prod and work out how many bits per
* pixel are supported.
*/
out_8(fb_regs + TC_WEN, 0xff);
out_8(fb_regs + TC_PRR, RR_COPY);
out_8(fb_regs + TC_FBEN, 0xff);
out_8(fb_start, 0xff);
fb_bitmask = in_8(fb_start);
out_8(fb_start, 0);
/*
* Enable reading/writing of all the planes.
*/
out_8(fb_regs + TC_WEN, fb_bitmask);
out_8(fb_regs + TC_PRR, RR_COPY);
out_8(fb_regs + TC_REN, fb_bitmask);
out_8(fb_regs + TC_FBEN, fb_bitmask);
/*
* Clear the screen.
*/
topcat_blit(0, 0, 0, 0, fb_width, fb_height, RR_CLEAR);
/*
* Let there be consoles..
*/
if (DIO_SECID(fb_regs) == DIO_ID2_TOPCAT)
strcat(fb_info.fix.id, "Topcat");
else
strcat(fb_info.fix.id, "Catseye");
fb_info.fbops = &hpfb_ops;
fb_info.flags = FBINFO_DEFAULT;
fb_info.var = hpfb_defined;
fb_info.screen_base = (char *)fb_start;
fb_alloc_cmap(&fb_info.cmap, 1 << hpfb_defined.bits_per_pixel, 0);
if (register_framebuffer(&fb_info) < 0) {
fb_dealloc_cmap(&fb_info.cmap);
return 1;
}
printk(KERN_INFO "fb%d: %s frame buffer device\n",
fb_info.node, fb_info.fix.id);
return 0;
}
/*
* Check that the secondary ID indicates that we have some hope of working with this
* framebuffer. The catseye boards are pretty much like topcats and we can muddle through.
*/
#define topcat_sid_ok(x) (((x) == DIO_ID2_LRCATSEYE) || ((x) == DIO_ID2_HRCCATSEYE) \
|| ((x) == DIO_ID2_HRMCATSEYE) || ((x) == DIO_ID2_TOPCAT))
/*
* Initialise the framebuffer
*/
static int __devinit hpfb_dio_probe(struct dio_dev * d, const struct dio_device_id * ent)
{
unsigned long paddr, vaddr;
paddr = d->resource.start;
if (!request_mem_region(d->resource.start, d->resource.end - d->resource.start, d->name))
return -EBUSY;
if (d->scode >= DIOII_SCBASE) {
vaddr = (unsigned long)ioremap(paddr, d->resource.end - d->resource.start);
} else {
vaddr = paddr + DIO_VIRADDRBASE;
}
printk(KERN_INFO "Topcat found at DIO select code %d "
"(secondary id %02x)\n", d->scode, (d->id >> 8) & 0xff);
if (hpfb_init_one(paddr, vaddr)) {
if (d->scode >= DIOII_SCBASE)
iounmap((void *)vaddr);
return -ENOMEM;
}
return 0;
}
static void __devexit hpfb_remove_one(struct dio_dev *d)
{
unregister_framebuffer(&fb_info);
if (d->scode >= DIOII_SCBASE)
iounmap((void *)fb_regs);
release_mem_region(d->resource.start, d->resource.end - d->resource.start);
}
static struct dio_device_id hpfb_dio_tbl[] = {
{ DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_LRCATSEYE) },
{ DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRCCATSEYE) },
{ DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRMCATSEYE) },
{ DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_TOPCAT) },
{ 0 }
};
static struct dio_driver hpfb_driver = {
.name = "hpfb",
.id_table = hpfb_dio_tbl,
.probe = hpfb_dio_probe,
.remove = __devexit_p(hpfb_remove_one),
};
int __init hpfb_init(void)
{
unsigned int sid;
mm_segment_t fs;
unsigned char i;
int err;
/* Topcats can be on the internal IO bus or real DIO devices.
* The internal variant sits at 0x560000; it has primary
* and secondary ID registers just like the DIO version.
* So we merge the two detection routines.
*
* Perhaps this #define should be in a global header file:
* I believe it's common to all internal fbs, not just topcat.
*/
#define INTFBVADDR 0xf0560000
#define INTFBPADDR 0x560000
if (!MACH_IS_HP300)
return -ENXIO;
if (fb_get_options("hpfb", NULL))
return -ENODEV;
err = dio_register_driver(&hpfb_driver);
if (err)
return err;
fs = get_fs();
set_fs(KERNEL_DS);
err = get_user(i, (unsigned char *)INTFBVADDR + DIO_IDOFF);
set_fs(fs);
if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) {
if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat"))
return -EBUSY;
printk(KERN_INFO "Internal Topcat found (secondary id %02x)\n", sid);
if (hpfb_init_one(INTFBPADDR, INTFBVADDR)) {
return -ENOMEM;
}
}
return 0;
}
void __exit hpfb_cleanup_module(void)
{
dio_unregister_driver(&hpfb_driver);
}
module_init(hpfb_init);
module_exit(hpfb_cleanup_module);
MODULE_LICENSE("GPL");
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