| // 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_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_mmap(struct fb_info *, struct vm_area_struct *); |
| static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long); |
| |
| /* |
| * Frame buffer operations |
| */ |
| |
| static const struct fb_ops bw2_ops = { |
| .owner = THIS_MODULE, |
| .fb_blank = bw2_blank, |
| .fb_fillrect = cfb_fillrect, |
| .fb_copyarea = cfb_copyarea, |
| .fb_imageblit = cfb_imageblit, |
| .fb_mmap = bw2_mmap, |
| .fb_ioctl = bw2_ioctl, |
| #ifdef CONFIG_COMPAT |
| .fb_compat_ioctl = sbusfb_compat_ioctl, |
| #endif |
| }; |
| |
| /* 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 struct sbus_mmap_map bw2_mmap_map[] = { |
| { |
| .size = SBUS_MMAP_FBSIZE(1) |
| }, |
| { .size = 0 } |
| }; |
| |
| static int bw2_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_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->flags = FBINFO_DEFAULT; |
| 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_new = 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"); |
