--- /dev/null
+/* 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 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_mode: 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)
+{
+ strlcpy(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_find_property(dp, "width", NULL)) {
+ 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 "%s: bwtwo at %lx:%lx\n",
+ dp->full_name, 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 int 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);
+
+ return 0;
+}
+
+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");
Code Review / kvmfornfv.git / blobdiff