// SPDX-License-Identifier: GPL-2.0-only/* bw2.c: BWTWO frame buffer driver * * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net) * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz) * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) * * Driver layout based loosely on tgafb.c, see that file for credits. */ #include <linux/module.h>#include <linux/kernel.h>#include <linux/errno.h>#include <linux/string.h>#include <linux/delay.h>#include <linux/init.h>#include <linux/fb.h>#include <linux/mm.h>#include <linux/of.h>#include <linux/platform_device.h> #include <asm/io.h>#include <asm/fbio.h> #include "sbuslib.h" /* * Local functions. */ static int bw2_blank(int, struct fb_info *); static int bw2_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma);static int bw2_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg); /* *  Frame buffer operations */ static const struct fb_ops bw2_ops = {	.owner			= THIS_MODULE,	FB_DEFAULT_SBUS_OPS(bw2),	.fb_blank		= bw2_blank,}; /* OBio addresses for the bwtwo registers */#define BWTWO_REGISTER_OFFSET 0x400000 struct bt_regs {	u32 addr;	u32 color_map;	u32 control;	u32 cursor;}; struct bw2_regs {	struct bt_regs	cmap;	u8	control;	u8	status;	u8	cursor_start;	u8	cursor_end;	u8	h_blank_start;	u8	h_blank_end;	u8	h_sync_start;	u8	h_sync_end;	u8	comp_sync_end;	u8	v_blank_start_high;	u8	v_blank_start_low;	u8	v_blank_end;	u8	v_sync_start;	u8	v_sync_end;	u8	xfer_holdoff_start;	u8	xfer_holdoff_end;}; /* Status Register Constants */#define BWTWO_SR_RES_MASK	0x70#define BWTWO_SR_1600_1280	0x50#define BWTWO_SR_1152_900_76_A	0x40#define BWTWO_SR_1152_900_76_B	0x60#define BWTWO_SR_ID_MASK	0x0f#define BWTWO_SR_ID_MONO	0x02#define BWTWO_SR_ID_MONO_ECL	0x03#define BWTWO_SR_ID_MSYNC	0x04#define BWTWO_SR_ID_NOCONN	0x0a /* Control Register Constants */#define BWTWO_CTL_ENABLE_INTS   0x80#define BWTWO_CTL_ENABLE_VIDEO  0x40#define BWTWO_CTL_ENABLE_TIMING 0x20#define BWTWO_CTL_ENABLE_CURCMP 0x10#define BWTWO_CTL_XTAL_MASK     0x0C#define BWTWO_CTL_DIVISOR_MASK  0x03 /* Status Register Constants */#define BWTWO_STAT_PENDING_INT  0x80#define BWTWO_STAT_MSENSE_MASK  0x70#define BWTWO_STAT_ID_MASK      0x0f struct bw2_par {	spinlock_t		lock;	struct bw2_regs		__iomem *regs; 	u32			flags;#define BW2_FLAG_BLANKED	0x00000001 	unsigned long		which_io;}; /** *      bw2_blank - Optional function.  Blanks the display. *      @blank: the blank mode we want. *      @info: frame buffer structure that represents a single frame buffer */static intbw2_blank(int blank, struct fb_info *info){	struct bw2_par *par = (struct bw2_par *) info->par;	struct bw2_regs __iomem *regs = par->regs;	unsigned long flags;	u8 val; 	spin_lock_irqsave(&par->lock, flags); 	switch (blank) {	case FB_BLANK_UNBLANK: /* Unblanking */		val = sbus_readb(&regs->control);		val |= BWTWO_CTL_ENABLE_VIDEO;		sbus_writeb(val, &regs->control);		par->flags &= ~BW2_FLAG_BLANKED;		break; 	case FB_BLANK_NORMAL: /* Normal blanking */	case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */	case FB_BLANK_POWERDOWN: /* Poweroff */		val = sbus_readb(&regs->control);		val &= ~BWTWO_CTL_ENABLE_VIDEO;		sbus_writeb(val, &regs->control);		par->flags |= BW2_FLAG_BLANKED;		break;	} 	spin_unlock_irqrestore(&par->lock, flags); 	return 0;} static const struct sbus_mmap_map bw2_mmap_map[] = {	{		.size = SBUS_MMAP_FBSIZE(1)	},	{ .size = 0 }}; static int bw2_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma){	struct bw2_par *par = (struct bw2_par *)info->par; 	return sbusfb_mmap_helper(bw2_mmap_map,				  info->fix.smem_start, info->fix.smem_len,				  par->which_io,				  vma);} static int bw2_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg){	return sbusfb_ioctl_helper(cmd, arg, info,				   FBTYPE_SUN2BW, 1, info->fix.smem_len);} /* *  Initialisation */ static void bw2_init_fix(struct fb_info *info, int linebytes){	strscpy(info->fix.id, "bwtwo", sizeof(info->fix.id)); 	info->fix.type = FB_TYPE_PACKED_PIXELS;	info->fix.visual = FB_VISUAL_MONO01; 	info->fix.line_length = linebytes; 	info->fix.accel = FB_ACCEL_SUN_BWTWO;} static u8 bw2regs_1600[] = {	0x14, 0x8b,	0x15, 0x28,	0x16, 0x03,	0x17, 0x13,	0x18, 0x7b,	0x19, 0x05,	0x1a, 0x34,	0x1b, 0x2e,	0x1c, 0x00,	0x1d, 0x0a,	0x1e, 0xff,	0x1f, 0x01,	0x10, 0x21,	0}; static u8 bw2regs_ecl[] = {	0x14, 0x65,	0x15, 0x1e,	0x16, 0x04,	0x17, 0x0c,	0x18, 0x5e,	0x19, 0x03,	0x1a, 0xa7,	0x1b, 0x23,	0x1c, 0x00,	0x1d, 0x08,	0x1e, 0xff,	0x1f, 0x01,	0x10, 0x20,	0}; static u8 bw2regs_analog[] = {	0x14, 0xbb,	0x15, 0x2b,	0x16, 0x03,	0x17, 0x13,	0x18, 0xb0,	0x19, 0x03,	0x1a, 0xa6,	0x1b, 0x22,	0x1c, 0x01,	0x1d, 0x05,	0x1e, 0xff,	0x1f, 0x01,	0x10, 0x20,	0}; static u8 bw2regs_76hz[] = {	0x14, 0xb7,	0x15, 0x27,	0x16, 0x03,	0x17, 0x0f,	0x18, 0xae,	0x19, 0x03,	0x1a, 0xae,	0x1b, 0x2a,	0x1c, 0x01,	0x1d, 0x09,	0x1e, 0xff,	0x1f, 0x01,	0x10, 0x24,	0}; static u8 bw2regs_66hz[] = {	0x14, 0xbb,	0x15, 0x2b,	0x16, 0x04,	0x17, 0x14,	0x18, 0xae,	0x19, 0x03,	0x1a, 0xa8,	0x1b, 0x24,	0x1c, 0x01,	0x1d, 0x05,	0x1e, 0xff,	0x1f, 0x01,	0x10, 0x20,	0}; static int bw2_do_default_mode(struct bw2_par *par, struct fb_info *info,			       int *linebytes){	u8 status, mon;	u8 *p; 	status = sbus_readb(&par->regs->status);	mon = status & BWTWO_SR_RES_MASK;	switch (status & BWTWO_SR_ID_MASK) {	case BWTWO_SR_ID_MONO_ECL:		if (mon == BWTWO_SR_1600_1280) {			p = bw2regs_1600;			info->var.xres = info->var.xres_virtual = 1600;			info->var.yres = info->var.yres_virtual = 1280;			*linebytes = 1600 / 8;		} else			p = bw2regs_ecl;		break; 	case BWTWO_SR_ID_MONO:		p = bw2regs_analog;		break; 	case BWTWO_SR_ID_MSYNC:		if (mon == BWTWO_SR_1152_900_76_A ||		    mon == BWTWO_SR_1152_900_76_B)			p = bw2regs_76hz;		else			p = bw2regs_66hz;		break; 	case BWTWO_SR_ID_NOCONN:		return 0; 	default:		printk(KERN_ERR "bw2: can't handle SR %02x\n",		       status);		return -EINVAL;	}	for ( ; *p; p += 2) {		u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];		sbus_writeb(p[1], regp);	}	return 0;} static int bw2_probe(struct platform_device *op){	struct device_node *dp = op->dev.of_node;	struct fb_info *info;	struct bw2_par *par;	int linebytes, err; 	info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev); 	err = -ENOMEM;	if (!info)		goto out_err;	par = info->par; 	spin_lock_init(&par->lock); 	info->fix.smem_start = op->resource[0].start;	par->which_io = op->resource[0].flags & IORESOURCE_BITS; 	sbusfb_fill_var(&info->var, dp, 1);	linebytes = of_getintprop_default(dp, "linebytes",					  info->var.xres); 	info->var.red.length = info->var.green.length =		info->var.blue.length = info->var.bits_per_pixel;	info->var.red.offset = info->var.green.offset =		info->var.blue.offset = 0; 	par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,			       sizeof(struct bw2_regs), "bw2 regs");	if (!par->regs)		goto out_release_fb; 	if (!of_property_present(dp, "width")) {		err = bw2_do_default_mode(par, info, &linebytes);		if (err)			goto out_unmap_regs;	} 	info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres); 	info->fbops = &bw2_ops; 	info->screen_base = of_ioremap(&op->resource[0], 0,				       info->fix.smem_len, "bw2 ram");	if (!info->screen_base) {		err = -ENOMEM;		goto out_unmap_regs;	} 	bw2_blank(FB_BLANK_UNBLANK, info); 	bw2_init_fix(info, linebytes); 	err = register_framebuffer(info);	if (err < 0)		goto out_unmap_screen; 	dev_set_drvdata(&op->dev, info); 	printk(KERN_INFO "%pOF: bwtwo at %lx:%lx\n",	       dp, par->which_io, info->fix.smem_start); 	return 0; out_unmap_screen:	of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); out_unmap_regs:	of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs)); out_release_fb:	framebuffer_release(info); out_err:	return err;} static void bw2_remove(struct platform_device *op){	struct fb_info *info = dev_get_drvdata(&op->dev);	struct bw2_par *par = info->par; 	unregister_framebuffer(info); 	of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));	of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); 	framebuffer_release(info);} static const struct of_device_id bw2_match[] = {	{		.name = "bwtwo",	},	{},};MODULE_DEVICE_TABLE(of, bw2_match); static struct platform_driver bw2_driver = {	.driver = {		.name = "bw2",		.of_match_table = bw2_match,	},	.probe		= bw2_probe,	.remove		= bw2_remove,}; static int __init bw2_init(void){	if (fb_get_options("bw2fb", NULL))		return -ENODEV; 	return platform_driver_register(&bw2_driver);} static void __exit bw2_exit(void){	platform_driver_unregister(&bw2_driver);} module_init(bw2_init);module_exit(bw2_exit); MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");MODULE_VERSION("2.0");MODULE_LICENSE("GPL");