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