![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
488 lines
12 KiB
C
488 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/drivers/video/vt8500lcdfb.c
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*
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* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
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*
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* Based on skeletonfb.c and pxafb.c
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*/
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/errno.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/wait.h>
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#include <video/of_display_timing.h>
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#include "vt8500lcdfb.h"
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#include "wmt_ge_rops.h"
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#ifdef CONFIG_OF
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/memblock.h>
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#endif
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#define to_vt8500lcd_info(__info) container_of(__info, \
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struct vt8500lcd_info, fb)
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static int vt8500lcd_set_par(struct fb_info *info)
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{
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struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
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int reg_bpp = 5; /* 16bpp */
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int i;
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unsigned long control0;
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if (!fbi)
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return -EINVAL;
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if (info->var.bits_per_pixel <= 8) {
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/* palettized */
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info->var.red.offset = 0;
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info->var.red.length = info->var.bits_per_pixel;
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info->var.red.msb_right = 0;
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info->var.green.offset = 0;
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info->var.green.length = info->var.bits_per_pixel;
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info->var.green.msb_right = 0;
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info->var.blue.offset = 0;
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info->var.blue.length = info->var.bits_per_pixel;
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info->var.blue.msb_right = 0;
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info->var.transp.offset = 0;
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info->var.transp.length = 0;
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info->var.transp.msb_right = 0;
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info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
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info->fix.line_length = info->var.xres_virtual /
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(8/info->var.bits_per_pixel);
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} else {
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/* non-palettized */
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info->var.transp.offset = 0;
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info->var.transp.length = 0;
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info->var.transp.msb_right = 0;
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if (info->var.bits_per_pixel == 16) {
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/* RGB565 */
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info->var.red.offset = 11;
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info->var.red.length = 5;
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info->var.red.msb_right = 0;
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info->var.green.offset = 5;
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info->var.green.length = 6;
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info->var.green.msb_right = 0;
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info->var.blue.offset = 0;
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info->var.blue.length = 5;
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info->var.blue.msb_right = 0;
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} else {
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/* Equal depths per channel */
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info->var.red.offset = info->var.bits_per_pixel
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* 2 / 3;
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info->var.red.length = info->var.bits_per_pixel / 3;
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info->var.red.msb_right = 0;
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info->var.green.offset = info->var.bits_per_pixel / 3;
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info->var.green.length = info->var.bits_per_pixel / 3;
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info->var.green.msb_right = 0;
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info->var.blue.offset = 0;
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info->var.blue.length = info->var.bits_per_pixel / 3;
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info->var.blue.msb_right = 0;
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}
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info->fix.visual = FB_VISUAL_TRUECOLOR;
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info->fix.line_length = info->var.bits_per_pixel > 16 ?
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info->var.xres_virtual << 2 :
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info->var.xres_virtual << 1;
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}
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for (i = 0; i < 8; i++) {
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if (bpp_values[i] == info->var.bits_per_pixel)
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reg_bpp = i;
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}
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control0 = readl(fbi->regbase) & ~0xf;
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writel(0, fbi->regbase);
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while (readl(fbi->regbase + 0x38) & 0x10)
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/* wait */;
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writel((((info->var.hsync_len - 1) & 0x3f) << 26)
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| ((info->var.left_margin & 0xff) << 18)
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| (((info->var.xres - 1) & 0x3ff) << 8)
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| (info->var.right_margin & 0xff), fbi->regbase + 0x4);
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writel((((info->var.vsync_len - 1) & 0x3f) << 26)
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| ((info->var.upper_margin & 0xff) << 18)
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| (((info->var.yres - 1) & 0x3ff) << 8)
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| (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
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writel((((info->var.yres - 1) & 0x400) << 2)
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| ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
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writel(0x80000000, fbi->regbase + 0x20);
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writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);
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return 0;
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}
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static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
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{
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chan &= 0xffff;
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chan >>= 16 - bf->length;
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return chan << bf->offset;
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}
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static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
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unsigned blue, unsigned transp,
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struct fb_info *info) {
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struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
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int ret = 1;
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unsigned int val;
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if (regno >= 256)
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return -EINVAL;
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if (info->var.grayscale)
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red = green = blue =
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(19595 * red + 38470 * green + 7471 * blue) >> 16;
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switch (fbi->fb.fix.visual) {
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case FB_VISUAL_TRUECOLOR:
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if (regno < 16) {
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u32 *pal = fbi->fb.pseudo_palette;
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val = chan_to_field(red, &fbi->fb.var.red);
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val |= chan_to_field(green, &fbi->fb.var.green);
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val |= chan_to_field(blue, &fbi->fb.var.blue);
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pal[regno] = val;
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ret = 0;
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}
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break;
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case FB_VISUAL_STATIC_PSEUDOCOLOR:
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case FB_VISUAL_PSEUDOCOLOR:
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writew((red & 0xf800)
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| ((green >> 5) & 0x7e0)
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| ((blue >> 11) & 0x1f),
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fbi->palette_cpu + sizeof(u16) * regno);
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break;
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}
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return ret;
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}
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static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
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unsigned long arg)
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{
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int ret = 0;
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struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
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if (cmd == FBIO_WAITFORVSYNC) {
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/* Unmask End of Frame interrupt */
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writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
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ret = wait_event_interruptible_timeout(fbi->wait,
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readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
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/* Mask back to reduce unwanted interrupt traffic */
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writel(0xffffffff, fbi->regbase + 0x3c);
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if (ret < 0)
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return ret;
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if (ret == 0)
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return -ETIMEDOUT;
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}
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return ret;
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}
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static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
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unsigned off = pixlen * var->xoffset
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+ info->fix.line_length * var->yoffset;
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struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
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writel((1 << 31)
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| (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
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| (off >> 2), fbi->regbase + 0x20);
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return 0;
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}
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/*
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* vt8500lcd_blank():
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* Blank the display by setting all palette values to zero. Note,
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* True Color modes do not really use the palette, so this will not
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* blank the display in all modes.
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*/
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static int vt8500lcd_blank(int blank, struct fb_info *info)
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{
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int i;
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switch (blank) {
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case FB_BLANK_POWERDOWN:
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case FB_BLANK_VSYNC_SUSPEND:
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case FB_BLANK_HSYNC_SUSPEND:
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case FB_BLANK_NORMAL:
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if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
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info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
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for (i = 0; i < 256; i++)
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vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
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case FB_BLANK_UNBLANK:
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if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
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info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
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fb_set_cmap(&info->cmap, info);
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}
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return 0;
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}
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static const struct fb_ops vt8500lcd_ops = {
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.owner = THIS_MODULE,
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.fb_set_par = vt8500lcd_set_par,
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.fb_setcolreg = vt8500lcd_setcolreg,
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.fb_fillrect = wmt_ge_fillrect,
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.fb_copyarea = wmt_ge_copyarea,
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.fb_imageblit = sys_imageblit,
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.fb_sync = wmt_ge_sync,
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.fb_ioctl = vt8500lcd_ioctl,
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.fb_pan_display = vt8500lcd_pan_display,
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.fb_blank = vt8500lcd_blank,
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};
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static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
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{
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struct vt8500lcd_info *fbi = dev_id;
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if (readl(fbi->regbase + 0x38) & (1 << 3))
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wake_up_interruptible(&fbi->wait);
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writel(0xffffffff, fbi->regbase + 0x38);
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return IRQ_HANDLED;
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}
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static int vt8500lcd_probe(struct platform_device *pdev)
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{
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struct vt8500lcd_info *fbi;
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struct resource *res;
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struct display_timings *disp_timing;
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void *addr;
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int irq, ret;
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struct fb_videomode of_mode;
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u32 bpp;
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dma_addr_t fb_mem_phys;
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unsigned long fb_mem_len;
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void *fb_mem_virt;
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ret = -ENOMEM;
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fbi = NULL;
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fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info)
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+ sizeof(u32) * 16, GFP_KERNEL);
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if (!fbi)
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return -ENOMEM;
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strcpy(fbi->fb.fix.id, "VT8500 LCD");
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fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
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fbi->fb.fix.xpanstep = 0;
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fbi->fb.fix.ypanstep = 1;
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fbi->fb.fix.ywrapstep = 0;
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fbi->fb.fix.accel = FB_ACCEL_NONE;
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fbi->fb.var.nonstd = 0;
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fbi->fb.var.activate = FB_ACTIVATE_NOW;
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fbi->fb.var.height = -1;
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fbi->fb.var.width = -1;
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fbi->fb.var.vmode = FB_VMODE_NONINTERLACED;
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fbi->fb.fbops = &vt8500lcd_ops;
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fbi->fb.flags = FBINFO_DEFAULT
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| FBINFO_HWACCEL_COPYAREA
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| FBINFO_HWACCEL_FILLRECT
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| FBINFO_HWACCEL_YPAN
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| FBINFO_VIRTFB
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| FBINFO_PARTIAL_PAN_OK;
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fbi->fb.node = -1;
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addr = fbi;
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addr = addr + sizeof(struct vt8500lcd_info);
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fbi->fb.pseudo_palette = addr;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "no I/O memory resource defined\n");
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return -ENODEV;
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}
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res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
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if (res == NULL) {
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dev_err(&pdev->dev, "failed to request I/O memory\n");
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return -EBUSY;
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}
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fbi->regbase = ioremap(res->start, resource_size(res));
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if (fbi->regbase == NULL) {
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dev_err(&pdev->dev, "failed to map I/O memory\n");
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ret = -EBUSY;
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goto failed_free_res;
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}
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disp_timing = of_get_display_timings(pdev->dev.of_node);
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if (!disp_timing) {
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ret = -EINVAL;
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goto failed_free_io;
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}
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ret = of_get_fb_videomode(pdev->dev.of_node, &of_mode,
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OF_USE_NATIVE_MODE);
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if (ret)
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goto failed_free_io;
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ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
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if (ret)
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goto failed_free_io;
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/* try allocating the framebuffer */
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fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8);
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fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
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GFP_KERNEL);
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if (!fb_mem_virt) {
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pr_err("%s: Failed to allocate framebuffer\n", __func__);
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ret = -ENOMEM;
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goto failed_free_io;
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}
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fbi->fb.fix.smem_start = fb_mem_phys;
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fbi->fb.fix.smem_len = fb_mem_len;
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fbi->fb.screen_base = fb_mem_virt;
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fbi->palette_size = PAGE_ALIGN(512);
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fbi->palette_cpu = dma_alloc_coherent(&pdev->dev,
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fbi->palette_size,
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&fbi->palette_phys,
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GFP_KERNEL);
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if (fbi->palette_cpu == NULL) {
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dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
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ret = -ENOMEM;
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goto failed_free_io;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "no IRQ defined\n");
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ret = -ENODEV;
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goto failed_free_palette;
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}
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ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi);
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if (ret) {
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dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
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ret = -EBUSY;
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goto failed_free_palette;
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}
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init_waitqueue_head(&fbi->wait);
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if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
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dev_err(&pdev->dev, "Failed to allocate color map\n");
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ret = -ENOMEM;
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goto failed_free_irq;
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}
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fb_videomode_to_var(&fbi->fb.var, &of_mode);
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fbi->fb.var.xres_virtual = of_mode.xres;
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fbi->fb.var.yres_virtual = of_mode.yres * 2;
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fbi->fb.var.bits_per_pixel = bpp;
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ret = vt8500lcd_set_par(&fbi->fb);
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if (ret) {
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dev_err(&pdev->dev, "Failed to set parameters\n");
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goto failed_free_cmap;
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}
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writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
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writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);
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platform_set_drvdata(pdev, fbi);
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ret = register_framebuffer(&fbi->fb);
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if (ret < 0) {
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dev_err(&pdev->dev,
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"Failed to register framebuffer device: %d\n", ret);
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goto failed_free_cmap;
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}
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/*
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* Ok, now enable the LCD controller
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*/
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writel(readl(fbi->regbase) | 1, fbi->regbase);
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return 0;
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failed_free_cmap:
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if (fbi->fb.cmap.len)
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fb_dealloc_cmap(&fbi->fb.cmap);
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failed_free_irq:
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free_irq(irq, fbi);
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failed_free_palette:
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dma_free_coherent(&pdev->dev, fbi->palette_size,
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fbi->palette_cpu, fbi->palette_phys);
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failed_free_io:
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iounmap(fbi->regbase);
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failed_free_res:
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release_mem_region(res->start, resource_size(res));
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return ret;
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}
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static int vt8500lcd_remove(struct platform_device *pdev)
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{
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struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
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struct resource *res;
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int irq;
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unregister_framebuffer(&fbi->fb);
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writel(0, fbi->regbase);
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if (fbi->fb.cmap.len)
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fb_dealloc_cmap(&fbi->fb.cmap);
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irq = platform_get_irq(pdev, 0);
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free_irq(irq, fbi);
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dma_free_coherent(&pdev->dev, fbi->palette_size,
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fbi->palette_cpu, fbi->palette_phys);
|
|
|
|
iounmap(fbi->regbase);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(res->start, resource_size(res));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id via_dt_ids[] = {
|
|
{ .compatible = "via,vt8500-fb", },
|
|
{}
|
|
};
|
|
|
|
static struct platform_driver vt8500lcd_driver = {
|
|
.probe = vt8500lcd_probe,
|
|
.remove = vt8500lcd_remove,
|
|
.driver = {
|
|
.name = "vt8500-lcd",
|
|
.of_match_table = of_match_ptr(via_dt_ids),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(vt8500lcd_driver);
|
|
|
|
MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
|
|
MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DEVICE_TABLE(of, via_dt_ids);
|