2 * linux/drivers/video/pmag-ba-fb.c
4 * PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support,
6 * "HP300 Topcat framebuffer support (derived from macfb of all things)
7 * Phil Blundell <philb@gnu.org> 1998", the original code can be
8 * found in the file hpfb.c in the same directory.
10 * Based on digital document:
11 * "PMAG-BA TURBOchannel Color Frame Buffer
12 * Functional Specification", Revision 1.2, August 27, 1990
14 * DECstation related code Copyright (C) 1999, 2000, 2001 by
15 * Michael Engel <engel@unix-ag.org>,
16 * Karsten Merker <merker@linuxtag.org> and
18 * Copyright (c) 2005 Maciej W. Rozycki
20 * This file is subject to the terms and conditions of the GNU General
21 * Public License. See the file COPYING in the main directory of this
22 * archive for more details.
25 #include <linux/compiler.h>
26 #include <linux/errno.h>
28 #include <linux/init.h>
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/types.h>
35 #include <asm/system.h>
37 #include <asm/dec/tc.h>
39 #include <video/pmag-ba-fb.h>
44 volatile void __iomem *mmio;
45 volatile u32 __iomem *dac;
50 static struct fb_info *root_pmagbafb_dev;
52 static struct fb_var_screeninfo pmagbafb_defined __initdata = {
61 .activate = FB_ACTIVATE_NOW,
64 .accel_flags = FB_ACCEL_NONE,
72 .sync = FB_SYNC_ON_GREEN,
73 .vmode = FB_VMODE_NONINTERLACED,
76 static struct fb_fix_screeninfo pmagbafb_fix __initdata = {
78 .smem_len = (1024 * 1024),
79 .type = FB_TYPE_PACKED_PIXELS,
80 .visual = FB_VISUAL_PSEUDOCOLOR,
82 .mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459,
86 static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
88 writeb(v, par->dac + reg / 4);
91 static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
93 return readb(par->dac + reg / 4);
100 static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
101 unsigned int green, unsigned int blue,
102 unsigned int transp, struct fb_info *info)
104 struct pmagbafb_par *par = info->par;
106 BUG_ON(regno >= info->cmap.len);
108 red >>= 8; /* The cmap fields are 16 bits */
109 green >>= 8; /* wide, but the hardware colormap */
110 blue >>= 8; /* registers are only 8 bits wide */
113 dac_write(par, BT459_ADDR_LO, regno);
114 dac_write(par, BT459_ADDR_HI, 0x00);
116 dac_write(par, BT459_CMAP, red);
118 dac_write(par, BT459_CMAP, green);
120 dac_write(par, BT459_CMAP, blue);
125 static struct fb_ops pmagbafb_ops = {
126 .owner = THIS_MODULE,
127 .fb_setcolreg = pmagbafb_setcolreg,
128 .fb_fillrect = cfb_fillrect,
129 .fb_copyarea = cfb_copyarea,
130 .fb_imageblit = cfb_imageblit,
131 .fb_cursor = soft_cursor,
136 * Turn the hardware cursor off.
138 static void __init pmagbafb_erase_cursor(struct fb_info *info)
140 struct pmagbafb_par *par = info->par;
143 dac_write(par, BT459_ADDR_LO, 0x00);
144 dac_write(par, BT459_ADDR_HI, 0x03);
146 dac_write(par, BT459_DATA, 0x00);
150 static int __init pmagbafb_init_one(int slot)
152 struct fb_info *info;
153 struct pmagbafb_par *par;
154 unsigned long base_addr;
156 info = framebuffer_alloc(sizeof(struct pmagbafb_par), NULL);
162 claim_tc_card(par->slot);
164 base_addr = get_tc_base_addr(par->slot);
166 par->next = root_pmagbafb_dev;
167 root_pmagbafb_dev = info;
169 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
172 info->fbops = &pmagbafb_ops;
173 info->fix = pmagbafb_fix;
174 info->var = pmagbafb_defined;
175 info->flags = FBINFO_DEFAULT;
177 /* MMIO mapping setup. */
178 info->fix.mmio_start = base_addr;
179 par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
182 par->dac = par->mmio + PMAG_BA_BT459;
184 /* Frame buffer mapping setup. */
185 info->fix.smem_start = base_addr + PMAG_BA_FBMEM;
186 info->screen_base = ioremap_nocache(info->fix.smem_start,
188 if (!info->screen_base)
190 info->screen_size = info->fix.smem_len;
192 pmagbafb_erase_cursor(info);
194 if (register_framebuffer(info) < 0)
197 pr_info("fb%d: %s frame buffer device in slot %d\n",
198 info->node, info->fix.id, par->slot);
204 iounmap(info->screen_base);
210 fb_dealloc_cmap(&info->cmap);
213 root_pmagbafb_dev = par->next;
214 release_tc_card(par->slot);
215 framebuffer_release(info);
219 static void __exit pmagbafb_exit_one(void)
221 struct fb_info *info = root_pmagbafb_dev;
222 struct pmagbafb_par *par = info->par;
224 unregister_framebuffer(info);
225 iounmap(info->screen_base);
227 fb_dealloc_cmap(&info->cmap);
228 root_pmagbafb_dev = par->next;
229 release_tc_card(par->slot);
230 framebuffer_release(info);
235 * Initialise the framebuffer.
237 static int __init pmagbafb_init(void)
242 if (fb_get_options("pmagbafb", NULL))
245 while ((slot = search_tc_card("PMAG-BA")) >= 0) {
246 if (pmagbafb_init_one(slot) < 0)
250 return (count > 0) ? 0 : -ENXIO;
253 static void __exit pmagbafb_exit(void)
255 while (root_pmagbafb_dev)
260 module_init(pmagbafb_init);
261 module_exit(pmagbafb_exit);
263 MODULE_LICENSE("GPL");