// 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 #include #include #include #include #include #include #include #include #include #include #include #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 int bw2_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(®s->control); val |= BWTWO_CTL_ENABLE_VIDEO; sbus_writeb(val, ®s->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(®s->control); val &= ~BWTWO_CTL_ENABLE_VIDEO; sbus_writeb(val, ®s->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 "); MODULE_VERSION("2.0"); MODULE_LICENSE("GPL");