Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[firefly-linux-kernel-4.4.55.git] / drivers / video / fbdev / 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
37 #include <video/pmag-ba-fb.h>
38
39
40 struct pmagbafb_par {
41         volatile void __iomem *mmio;
42         volatile u32 __iomem *dac;
43 };
44
45
46 static struct fb_var_screeninfo pmagbafb_defined = {
47         .xres           = 1024,
48         .yres           = 864,
49         .xres_virtual   = 1024,
50         .yres_virtual   = 864,
51         .bits_per_pixel = 8,
52         .red.length     = 8,
53         .green.length   = 8,
54         .blue.length    = 8,
55         .activate       = FB_ACTIVATE_NOW,
56         .height         = -1,
57         .width          = -1,
58         .accel_flags    = FB_ACCEL_NONE,
59         .pixclock       = 14452,
60         .left_margin    = 116,
61         .right_margin   = 12,
62         .upper_margin   = 34,
63         .lower_margin   = 12,
64         .hsync_len      = 128,
65         .vsync_len      = 3,
66         .sync           = FB_SYNC_ON_GREEN,
67         .vmode          = FB_VMODE_NONINTERLACED,
68 };
69
70 static struct fb_fix_screeninfo pmagbafb_fix = {
71         .id             = "PMAG-BA",
72         .smem_len       = (1024 * 1024),
73         .type           = FB_TYPE_PACKED_PIXELS,
74         .visual         = FB_VISUAL_PSEUDOCOLOR,
75         .line_length    = 1024,
76         .mmio_len       = PMAG_BA_SIZE - PMAG_BA_BT459,
77 };
78
79
80 static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
81 {
82         writeb(v, par->dac + reg / 4);
83 }
84
85 static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
86 {
87         return readb(par->dac + reg / 4);
88 }
89
90
91 /*
92  * Set the palette.
93  */
94 static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
95                               unsigned int green, unsigned int blue,
96                               unsigned int transp, struct fb_info *info)
97 {
98         struct pmagbafb_par *par = info->par;
99
100         if (regno >= info->cmap.len)
101                 return 1;
102
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 */
106
107         mb();
108         dac_write(par, BT459_ADDR_LO, regno);
109         dac_write(par, BT459_ADDR_HI, 0x00);
110         wmb();
111         dac_write(par, BT459_CMAP, red);
112         wmb();
113         dac_write(par, BT459_CMAP, green);
114         wmb();
115         dac_write(par, BT459_CMAP, blue);
116
117         return 0;
118 }
119
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,
126 };
127
128
129 /*
130  * Turn the hardware cursor off.
131  */
132 static void __init pmagbafb_erase_cursor(struct fb_info *info)
133 {
134         struct pmagbafb_par *par = info->par;
135
136         mb();
137         dac_write(par, BT459_ADDR_LO, 0x00);
138         dac_write(par, BT459_ADDR_HI, 0x03);
139         wmb();
140         dac_write(par, BT459_DATA, 0x00);
141 }
142
143
144 static int pmagbafb_probe(struct device *dev)
145 {
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;
150         int err;
151
152         info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
153         if (!info) {
154                 printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
155                 return -ENOMEM;
156         }
157
158         par = info->par;
159         dev_set_drvdata(dev, info);
160
161         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
162                 printk(KERN_ERR "%s: Cannot allocate color map\n",
163                        dev_name(dev));
164                 err = -ENOMEM;
165                 goto err_alloc;
166         }
167
168         info->fbops = &pmagbafb_ops;
169         info->fix = pmagbafb_fix;
170         info->var = pmagbafb_defined;
171         info->flags = FBINFO_DEFAULT;
172
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_name(dev))) {
177                 printk(KERN_ERR "%s: Cannot reserve FB region\n",
178                        dev_name(dev));
179                 err = -EBUSY;
180                 goto err_cmap;
181         }
182
183         /* MMIO mapping setup.  */
184         info->fix.mmio_start = start;
185         par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
186         if (!par->mmio) {
187                 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
188                 err = -ENOMEM;
189                 goto err_resource;
190         }
191         par->dac = par->mmio + PMAG_BA_BT459;
192
193         /* Frame buffer mapping setup.  */
194         info->fix.smem_start = start + PMAG_BA_FBMEM;
195         info->screen_base = ioremap_nocache(info->fix.smem_start,
196                                             info->fix.smem_len);
197         if (!info->screen_base) {
198                 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
199                 err = -ENOMEM;
200                 goto err_mmio_map;
201         }
202         info->screen_size = info->fix.smem_len;
203
204         pmagbafb_erase_cursor(info);
205
206         err = register_framebuffer(info);
207         if (err < 0) {
208                 printk(KERN_ERR "%s: Cannot register framebuffer\n",
209                        dev_name(dev));
210                 goto err_smem_map;
211         }
212
213         get_device(dev);
214
215         fb_info(info, "%s frame buffer device at %s\n",
216                 info->fix.id, dev_name(dev));
217
218         return 0;
219
220
221 err_smem_map:
222         iounmap(info->screen_base);
223
224 err_mmio_map:
225         iounmap(par->mmio);
226
227 err_resource:
228         release_mem_region(start, len);
229
230 err_cmap:
231         fb_dealloc_cmap(&info->cmap);
232
233 err_alloc:
234         framebuffer_release(info);
235         return err;
236 }
237
238 static int __exit pmagbafb_remove(struct device *dev)
239 {
240         struct tc_dev *tdev = to_tc_dev(dev);
241         struct fb_info *info = dev_get_drvdata(dev);
242         struct pmagbafb_par *par = info->par;
243         resource_size_t start, len;
244
245         put_device(dev);
246         unregister_framebuffer(info);
247         iounmap(info->screen_base);
248         iounmap(par->mmio);
249         start = tdev->resource.start;
250         len = tdev->resource.end - start + 1;
251         release_mem_region(start, len);
252         fb_dealloc_cmap(&info->cmap);
253         framebuffer_release(info);
254         return 0;
255 }
256
257
258 /*
259  * Initialize the framebuffer.
260  */
261 static const struct tc_device_id pmagbafb_tc_table[] = {
262         { "DEC     ", "PMAG-BA " },
263         { }
264 };
265 MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
266
267 static struct tc_driver pmagbafb_driver = {
268         .id_table       = pmagbafb_tc_table,
269         .driver         = {
270                 .name   = "pmagbafb",
271                 .bus    = &tc_bus_type,
272                 .probe  = pmagbafb_probe,
273                 .remove = __exit_p(pmagbafb_remove),
274         },
275 };
276
277 static int __init pmagbafb_init(void)
278 {
279 #ifndef MODULE
280         if (fb_get_options("pmagbafb", NULL))
281                 return -ENXIO;
282 #endif
283         return tc_register_driver(&pmagbafb_driver);
284 }
285
286 static void __exit pmagbafb_exit(void)
287 {
288         tc_unregister_driver(&pmagbafb_driver);
289 }
290
291
292 module_init(pmagbafb_init);
293 module_exit(pmagbafb_exit);
294
295 MODULE_LICENSE("GPL");