/* * linux/drivers/video/pmag-ba-fb.c * * PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support, * derived from: * "HP300 Topcat framebuffer support (derived from macfb of all things) * Phil Blundell <philb@gnu.org> 1998", the original code can be * found in the file hpfb.c in the same directory. * * Based on digital document: * "PMAG-BA TURBOchannel Color Frame Buffer * Functional Specification", Revision 1.2, August 27, 1990 * * DECstation related code Copyright (C) 1999, 2000, 2001 by * Michael Engel <engel@unix-ag.org>, * Karsten Merker <merker@linuxtag.org> and * Harald Koerfgen. * Copyright (c) 2005, 2006 Maciej W. Rozycki * Copyright (c) 2005 James Simmons * * This file is subject to the terms and conditions of the GNU General * Public License. See the file COPYING in the main directory of this * archive for more details. */ #include <linux/compiler.h> #include <linux/errno.h> #include <linux/fb.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/tc.h> #include <linux/types.h> #include <asm/io.h> #include <video/pmag-ba-fb.h> struct pmagbafb_par { volatile void __iomem *mmio; volatile u32 __iomem *dac; }; static const struct fb_var_screeninfo pmagbafb_defined = { .xres = 1024, .yres = 864, .xres_virtual = 1024, .yres_virtual = 864, .bits_per_pixel = 8, .red.length = 8, .green.length = 8, .blue.length = 8, .activate = FB_ACTIVATE_NOW, .height = -1, .width = -1, .accel_flags = FB_ACCEL_NONE, .pixclock = 14452, .left_margin = 116, .right_margin = 12, .upper_margin = 34, .lower_margin = 0, .hsync_len = 128, .vsync_len = 3, .sync = FB_SYNC_ON_GREEN, .vmode = FB_VMODE_NONINTERLACED, }; static const struct fb_fix_screeninfo pmagbafb_fix = { .id = "PMAG-BA", .smem_len = (1024 * 1024), .type = FB_TYPE_PACKED_PIXELS, .visual = FB_VISUAL_PSEUDOCOLOR, .line_length = 1024, .mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459, }; static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v) { writeb(v, par->dac + reg / 4); } static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg) { return readb(par->dac + reg / 4); } /* * Set the palette. */ static int pmagbafb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, unsigned int blue, unsigned int transp, struct fb_info *info) { struct pmagbafb_par *par = info->par; if (regno >= info->cmap.len) return 1; red >>= 8; /* The cmap fields are 16 bits */ green >>= 8; /* wide, but the hardware colormap */ blue >>= 8; /* registers are only 8 bits wide */ mb(); dac_write(par, BT459_ADDR_LO, regno); dac_write(par, BT459_ADDR_HI, 0x00); wmb(); dac_write(par, BT459_CMAP, red); wmb(); dac_write(par, BT459_CMAP, green); wmb(); dac_write(par, BT459_CMAP, blue); return 0; } static struct fb_ops pmagbafb_ops = { .owner = THIS_MODULE, .fb_setcolreg = pmagbafb_setcolreg, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, }; /* * Turn the hardware cursor off. */ static void pmagbafb_erase_cursor(struct fb_info *info) { struct pmagbafb_par *par = info->par; mb(); dac_write(par, BT459_ADDR_LO, 0x00); dac_write(par, BT459_ADDR_HI, 0x03); wmb(); dac_write(par, BT459_DATA, 0x00); } static int pmagbafb_probe(struct device *dev) { struct tc_dev *tdev = to_tc_dev(dev); resource_size_t start, len; struct fb_info *info; struct pmagbafb_par *par; int err; info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev); if (!info) { printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev)); return -ENOMEM; } par = info->par; dev_set_drvdata(dev, info); if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { printk(KERN_ERR "%s: Cannot allocate color map\n", dev_name(dev)); err = -ENOMEM; goto err_alloc; } info->fbops = &pmagbafb_ops; info->fix = pmagbafb_fix; info->var = pmagbafb_defined; info->flags = FBINFO_DEFAULT; /* Request the I/O MEM resource. */ start = tdev->resource.start; len = tdev->resource.end - start + 1; if (!request_mem_region(start, len, dev_name(dev))) { printk(KERN_ERR "%s: Cannot reserve FB region\n", dev_name(dev)); err = -EBUSY; goto err_cmap; } /* MMIO mapping setup. */ info->fix.mmio_start = start; par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len); if (!par->mmio) { printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev)); err = -ENOMEM; goto err_resource; } par->dac = par->mmio + PMAG_BA_BT459; /* Frame buffer mapping setup. */ info->fix.smem_start = start + PMAG_BA_FBMEM; info->screen_base = ioremap_nocache(info->fix.smem_start, info->fix.smem_len); if (!info->screen_base) { printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev)); err = -ENOMEM; goto err_mmio_map; } info->screen_size = info->fix.smem_len; pmagbafb_erase_cursor(info); err = register_framebuffer(info); if (err < 0) { printk(KERN_ERR "%s: Cannot register framebuffer\n", dev_name(dev)); goto err_smem_map; } get_device(dev); fb_info(info, "%s frame buffer device at %s\n", info->fix.id, dev_name(dev)); return 0; err_smem_map: iounmap(info->screen_base); err_mmio_map: iounmap(par->mmio); err_resource: release_mem_region(start, len); err_cmap: fb_dealloc_cmap(&info->cmap); err_alloc: framebuffer_release(info); return err; } static int pmagbafb_remove(struct device *dev) { struct tc_dev *tdev = to_tc_dev(dev); struct fb_info *info = dev_get_drvdata(dev); struct pmagbafb_par *par = info->par; resource_size_t start, len; put_device(dev); unregister_framebuffer(info); iounmap(info->screen_base); iounmap(par->mmio); start = tdev->resource.start; len = tdev->resource.end - start + 1; release_mem_region(start, len); fb_dealloc_cmap(&info->cmap); framebuffer_release(info); return 0; } /* * Initialize the framebuffer. */ static const struct tc_device_id pmagbafb_tc_table[] = { { "DEC ", "PMAG-BA " }, { } }; MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table); static struct tc_driver pmagbafb_driver = { .id_table = pmagbafb_tc_table, .driver = { .name = "pmagbafb", .bus = &tc_bus_type, .probe = pmagbafb_probe, .remove = pmagbafb_remove, }, }; static int __init pmagbafb_init(void) { #ifndef MODULE if (fb_get_options("pmagbafb", NULL)) return -ENXIO; #endif return tc_register_driver(&pmagbafb_driver); } static void __exit pmagbafb_exit(void) { tc_unregister_driver(&pmagbafb_driver); } module_init(pmagbafb_init); module_exit(pmagbafb_exit); MODULE_LICENSE("GPL");