![Jani Nikula](/assets/img/avatar_default.png)
Now that the fbops member of struct fb_info is const, we can start making the ops const as well. This does not cover all drivers; some actually modify the fbops struct, for example to adjust for different configurations, and others do more involved things that I'd rather not touch in practically obsolete drivers. Mostly this is the low hanging fruit where we can add "const" and be done with it. v3: - un-constify atyfb, mb862xx, nvidia and uvesabf (0day) v2: - fix typo (Christophe de Dinechin) - use "static const" instead of "const static" in mx3fb.c - also constify smscufx.c Cc: linux-fbdev@vger.kernel.org Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/ce67f14435f3af498f2e8bf35ce4be11f7504132.1575390740.git.jani.nikula@intel.com
493 lines
11 KiB
C
493 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* cg3.c: CGTHREE 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 cg3_setcolreg(unsigned, unsigned, unsigned, unsigned,
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unsigned, struct fb_info *);
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static int cg3_blank(int, struct fb_info *);
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static int cg3_mmap(struct fb_info *, struct vm_area_struct *);
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static int cg3_ioctl(struct fb_info *, unsigned int, unsigned long);
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/*
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* Frame buffer operations
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*/
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static const struct fb_ops cg3_ops = {
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.owner = THIS_MODULE,
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.fb_setcolreg = cg3_setcolreg,
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.fb_blank = cg3_blank,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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.fb_mmap = cg3_mmap,
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.fb_ioctl = cg3_ioctl,
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#ifdef CONFIG_COMPAT
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.fb_compat_ioctl = sbusfb_compat_ioctl,
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#endif
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};
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/* Control Register Constants */
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#define CG3_CR_ENABLE_INTS 0x80
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#define CG3_CR_ENABLE_VIDEO 0x40
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#define CG3_CR_ENABLE_TIMING 0x20
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#define CG3_CR_ENABLE_CURCMP 0x10
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#define CG3_CR_XTAL_MASK 0x0c
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#define CG3_CR_DIVISOR_MASK 0x03
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/* Status Register Constants */
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#define CG3_SR_PENDING_INT 0x80
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#define CG3_SR_RES_MASK 0x70
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#define CG3_SR_1152_900_76_A 0x40
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#define CG3_SR_1152_900_76_B 0x60
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#define CG3_SR_ID_MASK 0x0f
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#define CG3_SR_ID_COLOR 0x01
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#define CG3_SR_ID_MONO 0x02
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#define CG3_SR_ID_MONO_ECL 0x03
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enum cg3_type {
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CG3_AT_66HZ = 0,
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CG3_AT_76HZ,
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CG3_RDI
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};
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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 cg3_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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/* Offset of interesting structures in the OBIO space */
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#define CG3_REGS_OFFSET 0x400000UL
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#define CG3_RAM_OFFSET 0x800000UL
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struct cg3_par {
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spinlock_t lock;
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struct cg3_regs __iomem *regs;
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u32 sw_cmap[((256 * 3) + 3) / 4];
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u32 flags;
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#define CG3_FLAG_BLANKED 0x00000001
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#define CG3_FLAG_RDI 0x00000002
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unsigned long which_io;
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};
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/**
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* cg3_setcolreg - Optional function. Sets a color register.
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* @regno: boolean, 0 copy local, 1 get_user() function
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* @red: frame buffer colormap structure
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* @green: The green value which can be up to 16 bits wide
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* @blue: The blue value which can be up to 16 bits wide.
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* @transp: If supported the alpha value which can be up to 16 bits wide.
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* @info: frame buffer info structure
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*
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* The cg3 palette is loaded with 4 color values at each time
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* so you end up with: (rgb)(r), (gb)(rg), (b)(rgb), and so on.
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* We keep a sw copy of the hw cmap to assist us in this esoteric
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* loading procedure.
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*/
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static int cg3_setcolreg(unsigned regno,
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unsigned red, unsigned green, unsigned blue,
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unsigned transp, struct fb_info *info)
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{
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struct cg3_par *par = (struct cg3_par *) info->par;
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struct bt_regs __iomem *bt = &par->regs->cmap;
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unsigned long flags;
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u32 *p32;
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u8 *p8;
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int count;
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if (regno >= 256)
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return 1;
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red >>= 8;
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green >>= 8;
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blue >>= 8;
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spin_lock_irqsave(&par->lock, flags);
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p8 = (u8 *)par->sw_cmap + (regno * 3);
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p8[0] = red;
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p8[1] = green;
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p8[2] = blue;
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#define D4M3(x) ((((x)>>2)<<1) + ((x)>>2)) /* (x/4)*3 */
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#define D4M4(x) ((x)&~0x3) /* (x/4)*4 */
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count = 3;
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p32 = &par->sw_cmap[D4M3(regno)];
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sbus_writel(D4M4(regno), &bt->addr);
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while (count--)
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sbus_writel(*p32++, &bt->color_map);
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#undef D4M3
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#undef D4M4
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spin_unlock_irqrestore(&par->lock, flags);
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return 0;
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}
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/**
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* cg3_blank - Optional function. Blanks the display.
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* @blank_mode: 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 cg3_blank(int blank, struct fb_info *info)
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{
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struct cg3_par *par = (struct cg3_par *) info->par;
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struct cg3_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 |= CG3_CR_ENABLE_VIDEO;
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sbus_writeb(val, ®s->control);
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par->flags &= ~CG3_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 &= ~CG3_CR_ENABLE_VIDEO;
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sbus_writeb(val, ®s->control);
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par->flags |= CG3_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 cg3_mmap_map[] = {
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{
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.voff = CG3_MMAP_OFFSET,
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.poff = CG3_RAM_OFFSET,
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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 cg3_mmap(struct fb_info *info, struct vm_area_struct *vma)
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{
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struct cg3_par *par = (struct cg3_par *)info->par;
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return sbusfb_mmap_helper(cg3_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 cg3_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_SUN3COLOR, 8, 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 cg3_init_fix(struct fb_info *info, int linebytes,
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struct device_node *dp)
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{
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snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp);
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info->fix.type = FB_TYPE_PACKED_PIXELS;
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info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
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info->fix.line_length = linebytes;
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info->fix.accel = FB_ACCEL_SUN_CGTHREE;
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}
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static void cg3_rdi_maybe_fixup_var(struct fb_var_screeninfo *var,
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struct device_node *dp)
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{
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const char *params;
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char *p;
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int ww, hh;
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params = of_get_property(dp, "params", NULL);
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if (params) {
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ww = simple_strtoul(params, &p, 10);
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if (ww && *p == 'x') {
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hh = simple_strtoul(p + 1, &p, 10);
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if (hh && *p == '-') {
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if (var->xres != ww ||
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var->yres != hh) {
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var->xres = var->xres_virtual = ww;
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var->yres = var->yres_virtual = hh;
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}
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}
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}
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}
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}
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static u8 cg3regvals_66hz[] = { /* 1152 x 900, 66 Hz */
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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 u8 cg3regvals_76hz[] = { /* 1152 x 900, 76 Hz */
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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 cg3regvals_rdi[] = { /* 640 x 480, cgRDI */
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0x14, 0x70, 0x15, 0x20, 0x16, 0x08, 0x17, 0x10,
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0x18, 0x06, 0x19, 0x02, 0x1a, 0x31, 0x1b, 0x51,
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0x1c, 0x06, 0x1d, 0x0c, 0x1e, 0xff, 0x1f, 0x01,
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0x10, 0x22, 0
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};
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static u8 *cg3_regvals[] = {
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cg3regvals_66hz, cg3regvals_76hz, cg3regvals_rdi
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};
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static u_char cg3_dacvals[] = {
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4, 0xff, 5, 0x00, 6, 0x70, 7, 0x00, 0
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};
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static int cg3_do_default_mode(struct cg3_par *par)
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{
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enum cg3_type type;
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u8 *p;
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if (par->flags & CG3_FLAG_RDI)
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type = CG3_RDI;
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else {
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u8 status = sbus_readb(&par->regs->status), mon;
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if ((status & CG3_SR_ID_MASK) == CG3_SR_ID_COLOR) {
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mon = status & CG3_SR_RES_MASK;
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if (mon == CG3_SR_1152_900_76_A ||
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mon == CG3_SR_1152_900_76_B)
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type = CG3_AT_76HZ;
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else
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type = CG3_AT_66HZ;
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} else {
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printk(KERN_ERR "cgthree: 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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}
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for (p = cg3_regvals[type]; *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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for (p = cg3_dacvals; *p; p += 2) {
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u8 __iomem *regp;
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regp = (u8 __iomem *)&par->regs->cmap.addr;
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sbus_writeb(p[0], regp);
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regp = (u8 __iomem *)&par->regs->cmap.control;
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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 cg3_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 cg3_par *par;
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int linebytes, err;
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info = framebuffer_alloc(sizeof(struct cg3_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, 8);
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info->var.red.length = 8;
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info->var.green.length = 8;
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info->var.blue.length = 8;
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if (of_node_name_eq(dp, "cgRDI"))
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par->flags |= CG3_FLAG_RDI;
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if (par->flags & CG3_FLAG_RDI)
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cg3_rdi_maybe_fixup_var(&info->var, dp);
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linebytes = of_getintprop_default(dp, "linebytes",
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info->var.xres);
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info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
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par->regs = of_ioremap(&op->resource[0], CG3_REGS_OFFSET,
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sizeof(struct cg3_regs), "cg3 regs");
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if (!par->regs)
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goto out_release_fb;
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info->flags = FBINFO_DEFAULT;
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info->fbops = &cg3_ops;
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info->screen_base = of_ioremap(&op->resource[0], CG3_RAM_OFFSET,
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info->fix.smem_len, "cg3 ram");
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if (!info->screen_base)
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goto out_unmap_regs;
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cg3_blank(FB_BLANK_UNBLANK, info);
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if (!of_find_property(dp, "width", NULL)) {
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err = cg3_do_default_mode(par);
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if (err)
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goto out_unmap_screen;
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}
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err = fb_alloc_cmap(&info->cmap, 256, 0);
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if (err)
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goto out_unmap_screen;
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fb_set_cmap(&info->cmap, info);
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cg3_init_fix(info, linebytes, dp);
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err = register_framebuffer(info);
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if (err < 0)
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goto out_dealloc_cmap;
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dev_set_drvdata(&op->dev, info);
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printk(KERN_INFO "%pOF: cg3 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_dealloc_cmap:
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fb_dealloc_cmap(&info->cmap);
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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 cg3_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 cg3_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 cg3_par *par = info->par;
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unregister_framebuffer(info);
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fb_dealloc_cmap(&info->cmap);
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of_iounmap(&op->resource[0], par->regs, sizeof(struct cg3_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 cg3_match[] = {
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{
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.name = "cgthree",
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},
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{
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.name = "cgRDI",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, cg3_match);
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static struct platform_driver cg3_driver = {
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.driver = {
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.name = "cg3",
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.of_match_table = cg3_match,
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},
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.probe = cg3_probe,
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.remove = cg3_remove,
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};
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static int __init cg3_init(void)
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{
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if (fb_get_options("cg3fb", NULL))
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return -ENODEV;
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return platform_driver_register(&cg3_driver);
|
|
}
|
|
|
|
static void __exit cg3_exit(void)
|
|
{
|
|
platform_driver_unregister(&cg3_driver);
|
|
}
|
|
|
|
module_init(cg3_init);
|
|
module_exit(cg3_exit);
|
|
|
|
MODULE_DESCRIPTION("framebuffer driver for CGthree chipsets");
|
|
MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
|
|
MODULE_VERSION("2.0");
|
|
MODULE_LICENSE("GPL");
|