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[PATCH] DEC PMAG BA frame buffer update
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Rewrite PMAG BA frame buffer driver for 2.6.

Acked-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Ralf Baechle authored and Linus Torvalds committed Sep 5, 2005
1 parent 61838ff commit af690a9
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Showing 2 changed files with 205 additions and 121 deletions.
285 changes: 183 additions & 102 deletions drivers/video/pmag-ba-fb.c
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Original file line number Diff line number Diff line change
@@ -1,57 +1,55 @@
/*
* linux/drivers/video/pmag-ba-fb.c
* linux/drivers/video/pmag-ba-fb.c
*
* PMAG-BA TurboChannel framebuffer card support ... derived from:
* PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support,
* derived from:
* "HP300 Topcat framebuffer support (derived from macfb of all things)
* Phil Blundell <philb@gnu.org> 1998", the original code can be
* found in the file hpfb.c in the same directory.
* found in the file hpfb.c in the same directory.
*
* Based on digital document:
* "PMAG-BA TURBOchannel Color Frame Buffer
* Functional Specification", Revision 1.2, August 27, 1990
*
* DECstation related code Copyright (C) 1999, 2000, 2001 by
* Michael Engel <engel@unix-ag.org>,
* Karsten Merker <merker@linuxtag.org> and
* DECstation related code Copyright (C) 1999, 2000, 2001 by
* Michael Engel <engel@unix-ag.org>,
* Karsten Merker <merker@linuxtag.org> and
* Harald Koerfgen.
* 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.
* Copyright (c) 2005 Maciej W. Rozycki
*
* 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/sched.h>

#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/timer.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 <asm/bootinfo.h>
#include <asm/dec/machtype.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>

#include <asm/bug.h>
#include <asm/io.h>
#include <asm/system.h>

#include <asm/dec/tc.h>

#include <video/pmag-ba-fb.h>

struct pmag_ba_ramdac_regs {
unsigned char addr_low;
unsigned char pad0[3];
unsigned char addr_hi;
unsigned char pad1[3];
unsigned char data;
unsigned char pad2[3];
unsigned char cmap;

struct pmagbafb_par {
struct fb_info *next;
volatile void __iomem *mmio;
volatile u32 __iomem *dac;
int slot;
};

/*
* Max 3 TURBOchannel slots -> max 3 PMAG-BA :)
*/
static struct fb_info pmagba_fb_info[3];

static struct fb_var_screeninfo pmagbafb_defined = {
static struct fb_info *root_pmagbafb_dev;

static struct fb_var_screeninfo pmagbafb_defined __initdata = {
.xres = 1024,
.yres = 864,
.xres_virtual = 1024,
Expand All @@ -61,122 +59,205 @@ static struct fb_var_screeninfo pmagbafb_defined = {
.green.length = 8,
.blue.length = 8,
.activate = FB_ACTIVATE_NOW,
.height = 274,
.width = 195,
.accel = FB_ACCEL_NONE,
.height = -1,
.width = -1,
.accel_flags = FB_ACCEL_NONE,
.pixclock = 14452,
.left_margin = 116,
.right_margin = 12,
.upper_margin = 34,
.lower_margin = 12,
.hsync_len = 128,
.vsync_len = 3,
.sync = FB_SYNC_ON_GREEN,
.vmode = FB_VMODE_NONINTERLACED,
};

static struct fb_fix_screeninfo pmagbafb_fix = {
static struct fb_fix_screeninfo pmagbafb_fix __initdata = {
.id = "PMAG-BA",
.smem_len = (1024 * 864),
.smem_len = (1024 * 1024),
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_PSEUDOCOLOR,
.line_length = 1024,
.mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459,
};

/*
* Turn hardware cursor off
*/
void pmagbafb_erase_cursor(struct pmag_ba_ramdac_regs *bt459_regs)

static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
{
bt459_regs->addr_low = 0;
bt459_regs->addr_hi = 3;
bt459_regs->data = 0;
writeb(v, par->dac + reg / 4);
}

static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
{
return readb(par->dac + reg / 4);
}


/*
* Set the palette.
* Set the palette.
*/
static int pmagbafb_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp,
struct fb_info *info)
static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
unsigned int green, unsigned int blue,
unsigned int transp, struct fb_info *info)
{
struct pmag_ba_ramdac_regs *bt459_regs = (struct pmag_ba_ramdac_regs *) info->par;
struct pmagbafb_par *par = info->par;

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

red >>= 8; /* The cmap fields are 16 bits */
green >>= 8; /* wide, but the harware colormap */
green >>= 8; /* wide, but the hardware colormap */
blue >>= 8; /* registers are only 8 bits wide */

bt459_regs->addr_low = (__u8) regno;
bt459_regs->addr_hi = 0;
bt459_regs->cmap = red;
bt459_regs->cmap = green;
bt459_regs->cmap = blue;
mb();
dac_write(par, BT459_ADDR_LO, regno);
dac_write(par, BT459_ADDR_HI, 0x00);
wmb();
dac_write(par, BT459_CMAP, red);
wmb();
dac_write(par, BT459_CMAP, green);
wmb();
dac_write(par, BT459_CMAP, blue);

return 0;
}

static struct fb_ops pmagbafb_ops = {
.owner = THIS_MODULE,
.fb_get_fix = gen_get_fix,
.fb_get_var = gen_get_var,
.fb_setcolreg = pmagbafb_setcolreg,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_cursor = soft_cursor,
};

int __init pmagbafb_init_one(int slot)

/*
* Turn the hardware cursor off.
*/
static void __init pmagbafb_erase_cursor(struct fb_info *info)
{
struct pmagbafb_par *par = info->par;

mb();
dac_write(par, BT459_ADDR_LO, 0x00);
dac_write(par, BT459_ADDR_HI, 0x03);
wmb();
dac_write(par, BT459_DATA, 0x00);
}


static int __init pmagbafb_init_one(int slot)
{
unsigned long base_addr = get_tc_base_addr(slot);
struct fb_info *info = &pmagba_fb_info[slot];
struct display *disp = &pmagba_disp[slot];

printk("PMAG-BA framebuffer in slot %d\n", slot);
/*
* Framebuffer display memory base address and friends
*/
pmagbafb_fix.smem_start = base_addr + PMAG_BA_ONBOARD_FBMEM_OFFSET;
info->par = (base_addr + PMAG_BA_BT459_OFFSET);

/*
* Configure the Bt459 RAM DAC
*/
pmagbafb_erase_cursor((struct pmag_ba_ramdac_regs *) info->par);

/*
* Let there be consoles..
*/
struct fb_info *info;
struct pmagbafb_par *par;
unsigned long base_addr;

info = framebuffer_alloc(sizeof(struct pmagbafb_par), NULL);
if (!info)
return -ENOMEM;

par = info->par;
par->slot = slot;
claim_tc_card(par->slot);

base_addr = get_tc_base_addr(par->slot);

par->next = root_pmagbafb_dev;
root_pmagbafb_dev = info;

if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
goto err_alloc;

info->fbops = &pmagbafb_ops;
info->fix = pmagbafb_fix;
info->var = pmagbafb_defined;
info->fix = pmagbafb_fix;
info->screen_base = pmagbafb_fix.smem_start;
info->flags = FBINFO_DEFAULT;

fb_alloc_cmap(&fb_info.cmap, 256, 0);
/* MMIO mapping setup. */
info->fix.mmio_start = base_addr;
par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
if (!par->mmio)
goto err_cmap;
par->dac = par->mmio + PMAG_BA_BT459;

/* Frame buffer mapping setup. */
info->fix.smem_start = base_addr + PMAG_BA_FBMEM;
info->screen_base = ioremap_nocache(info->fix.smem_start,
info->fix.smem_len);
if (!info->screen_base)
goto err_mmio_map;
info->screen_size = info->fix.smem_len;

pmagbafb_erase_cursor(info);

if (register_framebuffer(info) < 0)
return 1;
goto err_smem_map;

pr_info("fb%d: %s frame buffer device in slot %d\n",
info->node, info->fix.id, par->slot);

return 0;


err_smem_map:
iounmap(info->screen_base);

err_mmio_map:
iounmap(par->mmio);

err_cmap:
fb_dealloc_cmap(&info->cmap);

err_alloc:
root_pmagbafb_dev = par->next;
release_tc_card(par->slot);
framebuffer_release(info);
return -ENXIO;
}

/*
* Initialise the framebuffer
*/
static void __exit pmagbafb_exit_one(void)
{
struct fb_info *info = root_pmagbafb_dev;
struct pmagbafb_par *par = info->par;

int __init pmagbafb_init(void)
unregister_framebuffer(info);
iounmap(info->screen_base);
iounmap(par->mmio);
fb_dealloc_cmap(&info->cmap);
root_pmagbafb_dev = par->next;
release_tc_card(par->slot);
framebuffer_release(info);
}


/*
* Initialise the framebuffer.
*/
static int __init pmagbafb_init(void)
{
int sid;
int found = 0;
int count = 0;
int slot;

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

if (TURBOCHANNEL) {
while ((sid = search_tc_card("PMAG-BA")) >= 0) {
found = 1;
claim_tc_card(sid);
pmagbafb_init_one(sid);
}
return found ? 0 : -ENODEV;
} else {
return -ENODEV;
return -ENXIO;

while ((slot = search_tc_card("PMAG-BA")) >= 0) {
if (pmagbafb_init_one(slot) < 0)
break;
count++;
}
return (count > 0) ? 0 : -ENXIO;
}

static void __exit pmagbafb_exit(void)
{
while (root_pmagbafb_dev)
pmagbafb_exit_one();
}


module_init(pmagbafb_init);
module_exit(pmagbafb_exit);

MODULE_LICENSE("GPL");
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