90c83176e5
Rework the driver to use the current frambuffer and TURBOchannel APIs, including proper resource management and using the new framework for hardware cursor support. NB two Bt431 cursor generators are included onboard, both responding at the same TURBOchannel bus addresses and with their host data buses wired to byte lanes #0 and #1 respectively of the 32-bit bus. Therefore both can be accessed simultaneously with 16-bit data transfers. Cursor outputs of the chip wired to lane #0 drive the respective overlay select inputs of the Bt455 RAMDAC, whereas cursor outputs of the chip wired to lane #1 drive the respective P3 pixel select inputs of the RAMDAC. So 5 (out of 17) Bt455 color registers are usable with this board: palette entries #0 and #1 for frame buffer pixel data driven while neither cursor generator is active, palette entries #8 and #9 for frame buffer pixel data driven while cursor generator #1 is active only and the overlay entry while cursor generator #0 is active. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
300 lines
7.4 KiB
C
300 lines
7.4 KiB
C
/*
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* linux/drivers/video/pmag-aa-fb.c
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* Copyright 2002 Karsten Merker <merker@debian.org>
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*
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* PMAG-AA TurboChannel framebuffer card support ... derived from
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* pmag-ba-fb.c, which is Copyright (C) 1999, 2000, 2001 by
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* Michael Engel <engel@unix-ag.org>, Karsten Merker <merker@debian.org>
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* and Harald Koerfgen <hkoerfg@web.de>, which itself is derived from
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* "HP300 Topcat framebuffer support (derived from macfb of all things)
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* Phil Blundell <philb@gnu.org> 1998"
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* Copyright (c) 2016 Maciej W. Rozycki
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* 2002-09-28 Karsten Merker <merker@linuxtag.org>
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* Version 0.01: First try to get a PMAG-AA running.
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*
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* 2003-02-24 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
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* Version 0.02: Major code cleanup.
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*
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* 2003-09-21 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
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* Hardware cursor support.
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*
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* 2016-02-21 Maciej W. Rozycki <macro@linux-mips.org>
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* Version 0.03: Rewritten for the new FB and TC APIs.
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*/
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#include <linux/compiler.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/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/tc.h>
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#include <linux/timer.h>
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#include "bt455.h"
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#include "bt431.h"
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/* Version information */
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#define DRIVER_VERSION "0.03"
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#define DRIVER_AUTHOR "Karsten Merker <merker@linuxtag.org>"
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#define DRIVER_DESCRIPTION "PMAG-AA Framebuffer Driver"
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/*
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* Bt455 RAM DAC register base offset (rel. to TC slot base address).
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*/
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#define PMAG_AA_BT455_OFFSET 0x100000
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/*
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* Bt431 cursor generator offset (rel. to TC slot base address).
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*/
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#define PMAG_AA_BT431_OFFSET 0x180000
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/*
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* Begin of PMAG-AA framebuffer memory relative to TC slot address,
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* resolution is 1280x1024x1 (8 bits deep, but only LSB is used).
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*/
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#define PMAG_AA_ONBOARD_FBMEM_OFFSET 0x200000
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struct aafb_par {
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void __iomem *mmio;
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struct bt455_regs __iomem *bt455;
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struct bt431_regs __iomem *bt431;
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};
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static struct fb_var_screeninfo aafb_defined = {
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.xres = 1280,
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.yres = 1024,
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.xres_virtual = 2048,
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.yres_virtual = 1024,
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.bits_per_pixel = 8,
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.grayscale = 1,
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.red.length = 0,
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.green.length = 1,
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.blue.length = 0,
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.activate = FB_ACTIVATE_NOW,
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.accel_flags = FB_ACCEL_NONE,
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.sync = FB_SYNC_ON_GREEN,
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.vmode = FB_VMODE_NONINTERLACED,
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};
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static struct fb_fix_screeninfo aafb_fix = {
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.id = "PMAG-AA",
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.smem_len = (2048 * 1024),
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_MONO10,
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.ypanstep = 1,
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.ywrapstep = 1,
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.line_length = 2048,
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.mmio_len = PMAG_AA_ONBOARD_FBMEM_OFFSET - PMAG_AA_BT455_OFFSET,
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};
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static int aafb_cursor(struct fb_info *info, struct fb_cursor *cursor)
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{
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struct aafb_par *par = info->par;
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if (cursor->image.height > BT431_CURSOR_SIZE ||
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cursor->image.width > BT431_CURSOR_SIZE) {
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bt431_erase_cursor(par->bt431);
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return -EINVAL;
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}
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if (!cursor->enable)
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bt431_erase_cursor(par->bt431);
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if (cursor->set & FB_CUR_SETPOS)
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bt431_position_cursor(par->bt431,
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cursor->image.dx, cursor->image.dy);
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if (cursor->set & FB_CUR_SETCMAP) {
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u8 fg = cursor->image.fg_color ? 0xf : 0x0;
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u8 bg = cursor->image.bg_color ? 0xf : 0x0;
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bt455_write_cmap_entry(par->bt455, 8, 0, bg, 0);
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bt455_write_cmap_entry(par->bt455, 9, 0, bg, 0);
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bt455_write_ovly_entry(par->bt455, 0, 0, fg, 0);
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}
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if (cursor->set & (FB_CUR_SETSIZE | FB_CUR_SETSHAPE | FB_CUR_SETIMAGE))
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bt431_set_cursor(par->bt431,
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cursor->image.data, cursor->mask, cursor->rop,
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cursor->image.width, cursor->image.height);
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if (cursor->enable)
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bt431_enable_cursor(par->bt431);
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return 0;
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}
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/* 0 unblanks, any other blanks. */
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static int aafb_blank(int blank, struct fb_info *info)
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{
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struct aafb_par *par = info->par;
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u8 val = blank ? 0x00 : 0x0f;
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bt455_write_cmap_entry(par->bt455, 1, val, val, val);
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return 0;
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}
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static struct fb_ops aafb_ops = {
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.owner = THIS_MODULE,
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.fb_blank = aafb_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_cursor = aafb_cursor,
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};
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static int pmagaafb_probe(struct device *dev)
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{
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struct tc_dev *tdev = to_tc_dev(dev);
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resource_size_t start, len;
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struct fb_info *info;
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struct aafb_par *par;
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int err;
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info = framebuffer_alloc(sizeof(struct aafb_par), dev);
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if (!info) {
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printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
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return -ENOMEM;
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}
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par = info->par;
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dev_set_drvdata(dev, info);
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info->fbops = &aafb_ops;
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info->fix = aafb_fix;
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info->var = aafb_defined;
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info->flags = FBINFO_DEFAULT;
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/* Request the I/O MEM resource. */
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start = tdev->resource.start;
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len = tdev->resource.end - start + 1;
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if (!request_mem_region(start, len, dev_name(dev))) {
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printk(KERN_ERR "%s: Cannot reserve FB region\n",
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dev_name(dev));
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err = -EBUSY;
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goto err_alloc;
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}
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/* MMIO mapping setup. */
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info->fix.mmio_start = start + PMAG_AA_BT455_OFFSET;
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par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
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if (!par->mmio) {
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printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
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err = -ENOMEM;
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goto err_resource;
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}
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par->bt455 = par->mmio - PMAG_AA_BT455_OFFSET + PMAG_AA_BT455_OFFSET;
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par->bt431 = par->mmio - PMAG_AA_BT455_OFFSET + PMAG_AA_BT431_OFFSET;
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/* Frame buffer mapping setup. */
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info->fix.smem_start = start + PMAG_AA_ONBOARD_FBMEM_OFFSET;
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info->screen_base = ioremap_nocache(info->fix.smem_start,
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info->fix.smem_len);
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if (!info->screen_base) {
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printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
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err = -ENOMEM;
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goto err_mmio_map;
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}
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info->screen_size = info->fix.smem_len;
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/* Init colormap. */
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bt455_write_cmap_entry(par->bt455, 0, 0x00, 0x00, 0x00);
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bt455_write_cmap_entry(par->bt455, 1, 0x0f, 0x0f, 0x0f);
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/* Init hardware cursor. */
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bt431_erase_cursor(par->bt431);
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bt431_init_cursor(par->bt431);
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err = register_framebuffer(info);
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if (err < 0) {
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printk(KERN_ERR "%s: Cannot register framebuffer\n",
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dev_name(dev));
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goto err_smem_map;
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}
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get_device(dev);
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pr_info("fb%d: %s frame buffer device at %s\n",
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info->node, info->fix.id, dev_name(dev));
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return 0;
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err_smem_map:
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iounmap(info->screen_base);
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err_mmio_map:
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iounmap(par->mmio);
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err_resource:
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release_mem_region(start, len);
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err_alloc:
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framebuffer_release(info);
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return err;
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}
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static int __exit pmagaafb_remove(struct device *dev)
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{
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struct tc_dev *tdev = to_tc_dev(dev);
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struct fb_info *info = dev_get_drvdata(dev);
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struct aafb_par *par = info->par;
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resource_size_t start, len;
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put_device(dev);
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unregister_framebuffer(info);
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iounmap(info->screen_base);
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iounmap(par->mmio);
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start = tdev->resource.start;
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len = tdev->resource.end - start + 1;
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release_mem_region(start, len);
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framebuffer_release(info);
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return 0;
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}
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/*
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* Initialise the framebuffer.
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*/
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static const struct tc_device_id pmagaafb_tc_table[] = {
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{ "DEC ", "PMAG-AA " },
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{ }
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};
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MODULE_DEVICE_TABLE(tc, pmagaafb_tc_table);
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static struct tc_driver pmagaafb_driver = {
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.id_table = pmagaafb_tc_table,
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.driver = {
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.name = "pmagaafb",
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.bus = &tc_bus_type,
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.probe = pmagaafb_probe,
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.remove = __exit_p(pmagaafb_remove),
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},
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};
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static int __init pmagaafb_init(void)
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{
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#ifndef MODULE
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if (fb_get_options("pmagaafb", NULL))
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return -ENXIO;
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#endif
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return tc_register_driver(&pmagaafb_driver);
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}
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static void __exit pmagaafb_exit(void)
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{
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tc_unregister_driver(&pmagaafb_driver);
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}
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module_init(pmagaafb_init);
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module_exit(pmagaafb_exit);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
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MODULE_LICENSE("GPL");
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