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, 2006 Maciej W. Rozycki
19 * Copyright (c) 2005 James Simmons
21 * This file is subject to the terms and conditions of the GNU General
22 * Public License. See the file COPYING in the main directory of this
23 * archive for more details.
26 #include <linux/compiler.h>
27 #include <linux/errno.h>
29 #include <linux/init.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
33 #include <linux/types.h>
36 #include <asm/system.h>
38 #include <video/pmag-ba-fb.h>
42 volatile void __iomem *mmio;
43 volatile u32 __iomem *dac;
47 static struct fb_var_screeninfo pmagbafb_defined __initdata = {
56 .activate = FB_ACTIVATE_NOW,
59 .accel_flags = FB_ACCEL_NONE,
67 .sync = FB_SYNC_ON_GREEN,
68 .vmode = FB_VMODE_NONINTERLACED,
71 static struct fb_fix_screeninfo pmagbafb_fix __initdata = {
73 .smem_len = (1024 * 1024),
74 .type = FB_TYPE_PACKED_PIXELS,
75 .visual = FB_VISUAL_PSEUDOCOLOR,
77 .mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459,
81 static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
83 writeb(v, par->dac + reg / 4);
86 static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
88 return readb(par->dac + reg / 4);
95 static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
96 unsigned int green, unsigned int blue,
97 unsigned int transp, struct fb_info *info)
99 struct pmagbafb_par *par = info->par;
101 BUG_ON(regno >= info->cmap.len);
103 red >>= 8; /* The cmap fields are 16 bits */
104 green >>= 8; /* wide, but the hardware colormap */
105 blue >>= 8; /* registers are only 8 bits wide */
108 dac_write(par, BT459_ADDR_LO, regno);
109 dac_write(par, BT459_ADDR_HI, 0x00);
111 dac_write(par, BT459_CMAP, red);
113 dac_write(par, BT459_CMAP, green);
115 dac_write(par, BT459_CMAP, blue);
120 static struct fb_ops pmagbafb_ops = {
121 .owner = THIS_MODULE,
122 .fb_setcolreg = pmagbafb_setcolreg,
123 .fb_fillrect = cfb_fillrect,
124 .fb_copyarea = cfb_copyarea,
125 .fb_imageblit = cfb_imageblit,
130 * Turn the hardware cursor off.
132 static void __init pmagbafb_erase_cursor(struct fb_info *info)
134 struct pmagbafb_par *par = info->par;
137 dac_write(par, BT459_ADDR_LO, 0x00);
138 dac_write(par, BT459_ADDR_HI, 0x03);
140 dac_write(par, BT459_DATA, 0x00);
144 static int __init pmagbafb_probe(struct device *dev)
146 struct tc_dev *tdev = to_tc_dev(dev);
147 resource_size_t start, len;
148 struct fb_info *info;
149 struct pmagbafb_par *par;
152 info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
154 printk(KERN_ERR "%s: Cannot allocate memory\n", dev->bus_id);
159 dev_set_drvdata(dev, info);
161 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
162 printk(KERN_ERR "%s: Cannot allocate color map\n",
168 info->fbops = &pmagbafb_ops;
169 info->fix = pmagbafb_fix;
170 info->var = pmagbafb_defined;
171 info->flags = FBINFO_DEFAULT;
173 /* Request the I/O MEM resource. */
174 start = tdev->resource.start;
175 len = tdev->resource.end - start + 1;
176 if (!request_mem_region(start, len, dev->bus_id)) {
177 printk(KERN_ERR "%s: Cannot reserve FB region\n", dev->bus_id);
182 /* MMIO mapping setup. */
183 info->fix.mmio_start = start;
184 par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
186 printk(KERN_ERR "%s: Cannot map MMIO\n", dev->bus_id);
190 par->dac = par->mmio + PMAG_BA_BT459;
192 /* Frame buffer mapping setup. */
193 info->fix.smem_start = start + PMAG_BA_FBMEM;
194 info->screen_base = ioremap_nocache(info->fix.smem_start,
196 if (!info->screen_base) {
197 printk(KERN_ERR "%s: Cannot map FB\n", dev->bus_id);
201 info->screen_size = info->fix.smem_len;
203 pmagbafb_erase_cursor(info);
205 err = register_framebuffer(info);
207 printk(KERN_ERR "%s: Cannot register framebuffer\n",
214 pr_info("fb%d: %s frame buffer device at %s\n",
215 info->node, info->fix.id, dev->bus_id);
221 iounmap(info->screen_base);
227 release_mem_region(start, len);
230 fb_dealloc_cmap(&info->cmap);
233 framebuffer_release(info);
237 static int __exit pmagbafb_remove(struct device *dev)
239 struct tc_dev *tdev = to_tc_dev(dev);
240 struct fb_info *info = dev_get_drvdata(dev);
241 struct pmagbafb_par *par = info->par;
242 resource_size_t start, len;
245 unregister_framebuffer(info);
246 iounmap(info->screen_base);
248 start = tdev->resource.start;
249 len = tdev->resource.end - start + 1;
250 release_mem_region(start, len);
251 fb_dealloc_cmap(&info->cmap);
252 framebuffer_release(info);
258 * Initialize the framebuffer.
260 static const struct tc_device_id pmagbafb_tc_table[] = {
261 { "DEC ", "PMAG-BA " },
264 MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
266 static struct tc_driver pmagbafb_driver = {
267 .id_table = pmagbafb_tc_table,
271 .probe = pmagbafb_probe,
272 .remove = __exit_p(pmagbafb_remove),
276 static int __init pmagbafb_init(void)
279 if (fb_get_options("pmagbafb", NULL))
282 return tc_register_driver(&pmagbafb_driver);
285 static void __exit pmagbafb_exit(void)
287 tc_unregister_driver(&pmagbafb_driver);
291 module_init(pmagbafb_init);
292 module_exit(pmagbafb_exit);
294 MODULE_LICENSE("GPL");