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293 lines
6.4 KiB
293 lines
6.4 KiB
/* |
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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 <[email protected]> 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 <[email protected]>, |
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* Karsten Merker <[email protected]> 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 const 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(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(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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