]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - drivers/video/pmag-ba-fb.c
OMAP: DSS2: DISPC: remove finegrained clk enables/disables
[linux-2.6.git] / drivers / video / pmag-ba-fb.c
1 /*
2  *      linux/drivers/video/pmag-ba-fb.c
3  *
4  *      PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support,
5  *      derived from:
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.
9  *
10  *      Based on digital document:
11  *      "PMAG-BA TURBOchannel Color Frame Buffer
12  *       Functional Specification", Revision 1.2, August 27, 1990
13  *
14  *      DECstation related code Copyright (C) 1999, 2000, 2001 by
15  *      Michael Engel <engel@unix-ag.org>,
16  *      Karsten Merker <merker@linuxtag.org> and
17  *      Harald Koerfgen.
18  *      Copyright (c) 2005, 2006  Maciej W. Rozycki
19  *      Copyright (c) 2005  James Simmons
20  *
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.
24  */
25
26 #include <linux/compiler.h>
27 #include <linux/errno.h>
28 #include <linux/fb.h>
29 #include <linux/init.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/tc.h>
33 #include <linux/types.h>
34
35 #include <asm/io.h>
36 #include <asm/system.h>
37
38 #include <video/pmag-ba-fb.h>
39
40
41 struct pmagbafb_par {
42         volatile void __iomem *mmio;
43         volatile u32 __iomem *dac;
44 };
45
46
47 static struct fb_var_screeninfo pmagbafb_defined __devinitdata = {
48         .xres           = 1024,
49         .yres           = 864,
50         .xres_virtual   = 1024,
51         .yres_virtual   = 864,
52         .bits_per_pixel = 8,
53         .red.length     = 8,
54         .green.length   = 8,
55         .blue.length    = 8,
56         .activate       = FB_ACTIVATE_NOW,
57         .height         = -1,
58         .width          = -1,
59         .accel_flags    = FB_ACCEL_NONE,
60         .pixclock       = 14452,
61         .left_margin    = 116,
62         .right_margin   = 12,
63         .upper_margin   = 34,
64         .lower_margin   = 12,
65         .hsync_len      = 128,
66         .vsync_len      = 3,
67         .sync           = FB_SYNC_ON_GREEN,
68         .vmode          = FB_VMODE_NONINTERLACED,
69 };
70
71 static struct fb_fix_screeninfo pmagbafb_fix __devinitdata = {
72         .id             = "PMAG-BA",
73         .smem_len       = (1024 * 1024),
74         .type           = FB_TYPE_PACKED_PIXELS,
75         .visual         = FB_VISUAL_PSEUDOCOLOR,
76         .line_length    = 1024,
77         .mmio_len       = PMAG_BA_SIZE - PMAG_BA_BT459,
78 };
79
80
81 static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
82 {
83         writeb(v, par->dac + reg / 4);
84 }
85
86 static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
87 {
88         return readb(par->dac + reg / 4);
89 }
90
91
92 /*
93  * Set the palette.
94  */
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)
98 {
99         struct pmagbafb_par *par = info->par;
100
101         if (regno >= info->cmap.len)
102                 return 1;
103
104         red   >>= 8;    /* The cmap fields are 16 bits    */
105         green >>= 8;    /* wide, but the hardware colormap */
106         blue  >>= 8;    /* registers are only 8 bits wide */
107
108         mb();
109         dac_write(par, BT459_ADDR_LO, regno);
110         dac_write(par, BT459_ADDR_HI, 0x00);
111         wmb();
112         dac_write(par, BT459_CMAP, red);
113         wmb();
114         dac_write(par, BT459_CMAP, green);
115         wmb();
116         dac_write(par, BT459_CMAP, blue);
117
118         return 0;
119 }
120
121 static struct fb_ops pmagbafb_ops = {
122         .owner          = THIS_MODULE,
123         .fb_setcolreg   = pmagbafb_setcolreg,
124         .fb_fillrect    = cfb_fillrect,
125         .fb_copyarea    = cfb_copyarea,
126         .fb_imageblit   = cfb_imageblit,
127 };
128
129
130 /*
131  * Turn the hardware cursor off.
132  */
133 static void __init pmagbafb_erase_cursor(struct fb_info *info)
134 {
135         struct pmagbafb_par *par = info->par;
136
137         mb();
138         dac_write(par, BT459_ADDR_LO, 0x00);
139         dac_write(par, BT459_ADDR_HI, 0x03);
140         wmb();
141         dac_write(par, BT459_DATA, 0x00);
142 }
143
144
145 static int __devinit pmagbafb_probe(struct device *dev)
146 {
147         struct tc_dev *tdev = to_tc_dev(dev);
148         resource_size_t start, len;
149         struct fb_info *info;
150         struct pmagbafb_par *par;
151         int err;
152
153         info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
154         if (!info) {
155                 printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
156                 return -ENOMEM;
157         }
158
159         par = info->par;
160         dev_set_drvdata(dev, info);
161
162         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
163                 printk(KERN_ERR "%s: Cannot allocate color map\n",
164                        dev_name(dev));
165                 err = -ENOMEM;
166                 goto err_alloc;
167         }
168
169         info->fbops = &pmagbafb_ops;
170         info->fix = pmagbafb_fix;
171         info->var = pmagbafb_defined;
172         info->flags = FBINFO_DEFAULT;
173
174         /* Request the I/O MEM resource.  */
175         start = tdev->resource.start;
176         len = tdev->resource.end - start + 1;
177         if (!request_mem_region(start, len, dev_name(dev))) {
178                 printk(KERN_ERR "%s: Cannot reserve FB region\n",
179                        dev_name(dev));
180                 err = -EBUSY;
181                 goto err_cmap;
182         }
183
184         /* MMIO mapping setup.  */
185         info->fix.mmio_start = start;
186         par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
187         if (!par->mmio) {
188                 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
189                 err = -ENOMEM;
190                 goto err_resource;
191         }
192         par->dac = par->mmio + PMAG_BA_BT459;
193
194         /* Frame buffer mapping setup.  */
195         info->fix.smem_start = start + PMAG_BA_FBMEM;
196         info->screen_base = ioremap_nocache(info->fix.smem_start,
197                                             info->fix.smem_len);
198         if (!info->screen_base) {
199                 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
200                 err = -ENOMEM;
201                 goto err_mmio_map;
202         }
203         info->screen_size = info->fix.smem_len;
204
205         pmagbafb_erase_cursor(info);
206
207         err = register_framebuffer(info);
208         if (err < 0) {
209                 printk(KERN_ERR "%s: Cannot register framebuffer\n",
210                        dev_name(dev));
211                 goto err_smem_map;
212         }
213
214         get_device(dev);
215
216         pr_info("fb%d: %s frame buffer device at %s\n",
217                 info->node, info->fix.id, dev_name(dev));
218
219         return 0;
220
221
222 err_smem_map:
223         iounmap(info->screen_base);
224
225 err_mmio_map:
226         iounmap(par->mmio);
227
228 err_resource:
229         release_mem_region(start, len);
230
231 err_cmap:
232         fb_dealloc_cmap(&info->cmap);
233
234 err_alloc:
235         framebuffer_release(info);
236         return err;
237 }
238
239 static int __exit pmagbafb_remove(struct device *dev)
240 {
241         struct tc_dev *tdev = to_tc_dev(dev);
242         struct fb_info *info = dev_get_drvdata(dev);
243         struct pmagbafb_par *par = info->par;
244         resource_size_t start, len;
245
246         put_device(dev);
247         unregister_framebuffer(info);
248         iounmap(info->screen_base);
249         iounmap(par->mmio);
250         start = tdev->resource.start;
251         len = tdev->resource.end - start + 1;
252         release_mem_region(start, len);
253         fb_dealloc_cmap(&info->cmap);
254         framebuffer_release(info);
255         return 0;
256 }
257
258
259 /*
260  * Initialize the framebuffer.
261  */
262 static const struct tc_device_id pmagbafb_tc_table[] = {
263         { "DEC     ", "PMAG-BA " },
264         { }
265 };
266 MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
267
268 static struct tc_driver pmagbafb_driver = {
269         .id_table       = pmagbafb_tc_table,
270         .driver         = {
271                 .name   = "pmagbafb",
272                 .bus    = &tc_bus_type,
273                 .probe  = pmagbafb_probe,
274                 .remove = __exit_p(pmagbafb_remove),
275         },
276 };
277
278 static int __init pmagbafb_init(void)
279 {
280 #ifndef MODULE
281         if (fb_get_options("pmagbafb", NULL))
282                 return -ENXIO;
283 #endif
284         return tc_register_driver(&pmagbafb_driver);
285 }
286
287 static void __exit pmagbafb_exit(void)
288 {
289         tc_unregister_driver(&pmagbafb_driver);
290 }
291
292
293 module_init(pmagbafb_init);
294 module_exit(pmagbafb_exit);
295
296 MODULE_LICENSE("GPL");