diff options
Diffstat (limited to 'drivers/video/fbdev/bw2.c')
| -rw-r--r-- | drivers/video/fbdev/bw2.c | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/drivers/video/fbdev/bw2.c b/drivers/video/fbdev/bw2.c new file mode 100644 index 0000000000..de34f1f333 --- /dev/null +++ b/drivers/video/fbdev/bw2.c @@ -0,0 +1,404 @@ +// 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_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->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"); |