/* * 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 Maciej W. Rozycki * * 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/types.h> #include <asm/bug.h> #include <asm/io.h> #include <asm/system.h> #include <asm/dec/tc.h> #include <video/pmag-ba-fb.h> struct pmagbafb_par { struct fb_info *next; volatile void __iomem *mmio; volatile u32 __iomem *dac; int slot; }; static struct fb_info *root_pmagbafb_dev; static struct fb_var_screeninfo pmagbafb_defined __initdata = { .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 = 12, .hsync_len = 128, .vsync_len = 3, .sync = FB_SYNC_ON_GREEN, .vmode = FB_VMODE_NONINTERLACED, }; static struct fb_fix_screeninfo pmagbafb_fix __initdata = { .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; BUG_ON(regno >= info->cmap.len); 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 __init 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 __init pmagbafb_init_one(int slot) { struct fb_info *info; struct pmagbafb_par *par; unsigned long base_addr; info = framebuffer_alloc(sizeof(struct pmagbafb_par), NULL); if (!info) return -ENOMEM; par = info->par; par->slot = slot; claim_tc_card(par->slot); base_addr = get_tc_base_addr(par->slot); par->next = root_pmagbafb_dev; root_pmagbafb_dev = info; if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) goto err_alloc; info->fbops = &pmagbafb_ops; info->fix = pmagbafb_fix; info->var = pmagbafb_defined; info->flags = FBINFO_DEFAULT; /* MMIO mapping setup. */ info->fix.mmio_start = base_addr; par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len); if (!par->mmio) goto err_cmap; par->dac = par->mmio + PMAG_BA_BT459; /* Frame buffer mapping setup. */ info->fix.smem_start = base_addr + PMAG_BA_FBMEM; info->screen_base = ioremap_nocache(info->fix.smem_start, info->fix.smem_len); if (!info->screen_base) goto err_mmio_map; info->screen_size = info->fix.smem_len; pmagbafb_erase_cursor(info); if (register_framebuffer(info) < 0) goto err_smem_map; pr_info("fb%d: %s frame buffer device in slot %d\n", info->node, info->fix.id, par->slot); return 0; err_smem_map: iounmap(info->screen_base); err_mmio_map: iounmap(par->mmio); err_cmap: fb_dealloc_cmap(&info->cmap); err_alloc: root_pmagbafb_dev = par->next; release_tc_card(par->slot); framebuffer_release(info); return -ENXIO; } static void __exit pmagbafb_exit_one(void) { struct fb_info *info = root_pmagbafb_dev; struct pmagbafb_par *par = info->par; unregister_framebuffer(info); iounmap(info->screen_base); iounmap(par->mmio); fb_dealloc_cmap(&info->cmap); root_pmagbafb_dev = par->next; release_tc_card(par->slot); framebuffer_release(info); } /* * Initialise the framebuffer. */ static int __init pmagbafb_init(void) { int count = 0; int slot; if (fb_get_options("pmagbafb", NULL)) return -ENXIO; while ((slot = search_tc_card("PMAG-BA")) >= 0) { if (pmagbafb_init_one(slot) < 0) break; count++; } return (count > 0) ? 0 : -ENXIO; } static void __exit pmagbafb_exit(void) { while (root_pmagbafb_dev) pmagbafb_exit_one(); } module_init(pmagbafb_init); module_exit(pmagbafb_exit); MODULE_LICENSE("GPL");