controlfb.c

Linux环境下视频显示卡设备的驱动程序源代码

/*
 *  controlfb.c -- frame buffer device for the PowerMac 'control' display
 *
 *  Created 12 July 1998 by Dan Jacobowitz <[e-mail]>
 *  Copyright (C) 1998 Dan Jacobowitz
 *  Copyright (C) 2001 Takashi Oe
 *
 *  Mmap code by Michel Lanners <[e-mail]>
 *
 *  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
 *  <[e-mail]>, Paul Mackerras <[e-mail]>,
 *  and James Simmons <[e-mail]>.
 *
 *  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);
	       vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
       } else {
               /* framebuffer */
	       vma->vm_page_prot = pgprot_cached_wthru(vma->vm_page_prot);
       }
       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 */
}