294 lines
6.4 KiB
C
294 lines
6.4 KiB
C
/*
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* linux/drivers/video/pmag-ba-fb.c
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*
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* PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support,
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* 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", the original code can be
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* found in the file hpfb.c in the same directory.
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*
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* Based on digital document:
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* "PMAG-BA TURBOchannel Color Frame Buffer
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* Functional Specification", Revision 1.2, August 27, 1990
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*
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* DECstation related code Copyright (C) 1999, 2000, 2001 by
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* Michael Engel <engel@unix-ag.org>,
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* Karsten Merker <merker@linuxtag.org> and
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* Harald Koerfgen.
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* Copyright (c) 2005, 2006 Maciej W. Rozycki
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* Copyright (c) 2005 James Simmons
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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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#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/kernel.h>
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#include <linux/module.h>
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#include <linux/tc.h>
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#include <linux/types.h>
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#include <asm/io.h>
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#include <video/pmag-ba-fb.h>
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struct pmagbafb_par {
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volatile void __iomem *mmio;
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volatile u32 __iomem *dac;
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};
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static const struct fb_var_screeninfo pmagbafb_defined = {
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.xres = 1024,
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.yres = 864,
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.xres_virtual = 1024,
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.yres_virtual = 864,
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.bits_per_pixel = 8,
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.red.length = 8,
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.green.length = 8,
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.blue.length = 8,
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.activate = FB_ACTIVATE_NOW,
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.height = -1,
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.width = -1,
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.accel_flags = FB_ACCEL_NONE,
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.pixclock = 14452,
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.left_margin = 116,
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.right_margin = 12,
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.upper_margin = 34,
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.lower_margin = 0,
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.hsync_len = 128,
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.vsync_len = 3,
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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 const struct fb_fix_screeninfo pmagbafb_fix = {
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.id = "PMAG-BA",
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.smem_len = (1024 * 1024),
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_PSEUDOCOLOR,
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.line_length = 1024,
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.mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459,
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};
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static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
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{
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writeb(v, par->dac + reg / 4);
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}
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static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
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{
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return readb(par->dac + reg / 4);
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}
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/*
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* Set the palette.
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*/
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static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
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unsigned int green, unsigned int blue,
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unsigned int transp, struct fb_info *info)
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{
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struct pmagbafb_par *par = info->par;
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if (regno >= info->cmap.len)
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return 1;
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red >>= 8; /* The cmap fields are 16 bits */
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green >>= 8; /* wide, but the hardware colormap */
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blue >>= 8; /* registers are only 8 bits wide */
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mb();
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dac_write(par, BT459_ADDR_LO, regno);
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dac_write(par, BT459_ADDR_HI, 0x00);
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wmb();
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dac_write(par, BT459_CMAP, red);
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wmb();
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dac_write(par, BT459_CMAP, green);
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wmb();
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dac_write(par, BT459_CMAP, blue);
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return 0;
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}
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static struct fb_ops pmagbafb_ops = {
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.owner = THIS_MODULE,
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.fb_setcolreg = pmagbafb_setcolreg,
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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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};
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/*
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* Turn the hardware cursor off.
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*/
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static void pmagbafb_erase_cursor(struct fb_info *info)
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{
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struct pmagbafb_par *par = info->par;
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mb();
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dac_write(par, BT459_ADDR_LO, 0x00);
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dac_write(par, BT459_ADDR_HI, 0x03);
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wmb();
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dac_write(par, BT459_DATA, 0x00);
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}
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static int pmagbafb_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 pmagbafb_par *par;
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int err;
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info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
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if (!info)
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return -ENOMEM;
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par = info->par;
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dev_set_drvdata(dev, info);
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if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
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printk(KERN_ERR "%s: Cannot allocate color map\n",
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dev_name(dev));
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err = -ENOMEM;
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goto err_alloc;
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}
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info->fbops = &pmagbafb_ops;
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info->fix = pmagbafb_fix;
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info->var = pmagbafb_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_cmap;
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}
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/* MMIO mapping setup. */
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info->fix.mmio_start = start;
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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->dac = par->mmio + PMAG_BA_BT459;
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/* Frame buffer mapping setup. */
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info->fix.smem_start = start + PMAG_BA_FBMEM;
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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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pmagbafb_erase_cursor(info);
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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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fb_info(info, "%s frame buffer device at %s\n",
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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_cmap:
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fb_dealloc_cmap(&info->cmap);
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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 pmagbafb_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 pmagbafb_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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fb_dealloc_cmap(&info->cmap);
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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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* Initialize the framebuffer.
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*/
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static const struct tc_device_id pmagbafb_tc_table[] = {
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{ "DEC ", "PMAG-BA " },
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{ }
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};
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MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
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static struct tc_driver pmagbafb_driver = {
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.id_table = pmagbafb_tc_table,
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.driver = {
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.name = "pmagbafb",
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.bus = &tc_bus_type,
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.probe = pmagbafb_probe,
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.remove = pmagbafb_remove,
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},
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};
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static int __init pmagbafb_init(void)
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{
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#ifndef MODULE
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if (fb_get_options("pmagbafb", NULL))
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return -ENXIO;
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#endif
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return tc_register_driver(&pmagbafb_driver);
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}
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static void __exit pmagbafb_exit(void)
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{
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tc_unregister_driver(&pmagbafb_driver);
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}
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module_init(pmagbafb_init);
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module_exit(pmagbafb_exit);
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MODULE_LICENSE("GPL");
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