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;
151 info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
156 dev_set_drvdata(dev, info);
158 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
161 info->fbops = &pmagbafb_ops;
162 info->fix = pmagbafb_fix;
163 info->var = pmagbafb_defined;
164 info->flags = FBINFO_DEFAULT;
166 /* Request the I/O MEM resource. */
167 start = tdev->resource.start;
168 len = tdev->resource.end - start + 1;
169 if (!request_mem_region(start, len, dev->bus_id))
172 /* MMIO mapping setup. */
173 info->fix.mmio_start = start;
174 par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
177 par->dac = par->mmio + PMAG_BA_BT459;
179 /* Frame buffer mapping setup. */
180 info->fix.smem_start = start + PMAG_BA_FBMEM;
181 info->screen_base = ioremap_nocache(info->fix.smem_start,
183 if (!info->screen_base)
185 info->screen_size = info->fix.smem_len;
187 pmagbafb_erase_cursor(info);
189 if (register_framebuffer(info) < 0)
194 pr_info("fb%d: %s frame buffer device at %s\n",
195 info->node, info->fix.id, dev->bus_id);
201 iounmap(info->screen_base);
207 release_mem_region(start, len);
210 fb_dealloc_cmap(&info->cmap);
213 framebuffer_release(info);
217 static int __exit pmagbafb_remove(struct device *dev)
219 struct tc_dev *tdev = to_tc_dev(dev);
220 struct fb_info *info = dev_get_drvdata(dev);
221 struct pmagbafb_par *par = info->par;
222 resource_size_t start, len;
225 unregister_framebuffer(info);
226 iounmap(info->screen_base);
228 start = tdev->resource.start;
229 len = tdev->resource.end - start + 1;
230 release_mem_region(start, len);
231 fb_dealloc_cmap(&info->cmap);
232 framebuffer_release(info);
238 * Initialize the framebuffer.
240 static const struct tc_device_id pmagbafb_tc_table[] = {
241 { "DEC ", "PMAG-BA " },
244 MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
246 static struct tc_driver pmagbafb_driver = {
247 .id_table = pmagbafb_tc_table,
251 .probe = pmagbafb_probe,
252 .remove = __exit_p(pmagbafb_remove),
256 static int __init pmagbafb_init(void)
259 if (fb_get_options("pmagbafb", NULL))
262 return tc_register_driver(&pmagbafb_driver);
265 static void __exit pmagbafb_exit(void)
267 tc_unregister_driver(&pmagbafb_driver);
271 module_init(pmagbafb_init);
272 module_exit(pmagbafb_exit);
274 MODULE_LICENSE("GPL");