xref: /openbmc/linux/drivers/video/fbdev/pmag-aa-fb.c (revision 8a478b00)
1 /*
2  *	linux/drivers/video/pmag-aa-fb.c
3  *	Copyright 2002 Karsten Merker <merker@debian.org>
4  *
5  *	PMAG-AA TurboChannel framebuffer card support ... derived from
6  *	pmag-ba-fb.c, which is Copyright (C) 1999, 2000, 2001 by
7  *	Michael Engel <engel@unix-ag.org>, Karsten Merker <merker@debian.org>
8  *	and Harald Koerfgen <hkoerfg@web.de>, which itself is derived from
9  *	"HP300 Topcat framebuffer support (derived from macfb of all things)
10  *	Phil Blundell <philb@gnu.org> 1998"
11  *	Copyright (c) 2016  Maciej W. Rozycki
12  *
13  *	This file is subject to the terms and conditions of the GNU General
14  *	Public License.  See the file COPYING in the main directory of this
15  *	archive for more details.
16  *
17  *	2002-09-28  Karsten Merker <merker@linuxtag.org>
18  *		Version 0.01: First try to get a PMAG-AA running.
19  *
20  *	2003-02-24  Thiemo Seufer  <seufer@csv.ica.uni-stuttgart.de>
21  *		Version 0.02: Major code cleanup.
22  *
23  *	2003-09-21  Thiemo Seufer  <seufer@csv.ica.uni-stuttgart.de>
24  *		Hardware cursor support.
25  *
26  *	2016-02-21  Maciej W. Rozycki  <macro@linux-mips.org>
27  *		Version 0.03: Rewritten for the new FB and TC APIs.
28  */
29 
30 #include <linux/compiler.h>
31 #include <linux/errno.h>
32 #include <linux/fb.h>
33 #include <linux/init.h>
34 #include <linux/io.h>
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/tc.h>
38 #include <linux/timer.h>
39 
40 #include "bt455.h"
41 #include "bt431.h"
42 
43 /* Version information */
44 #define DRIVER_VERSION "0.03"
45 #define DRIVER_AUTHOR "Karsten Merker <merker@linuxtag.org>"
46 #define DRIVER_DESCRIPTION "PMAG-AA Framebuffer Driver"
47 
48 /*
49  * Bt455 RAM DAC register base offset (rel. to TC slot base address).
50  */
51 #define PMAG_AA_BT455_OFFSET		0x100000
52 
53 /*
54  * Bt431 cursor generator offset (rel. to TC slot base address).
55  */
56 #define PMAG_AA_BT431_OFFSET		0x180000
57 
58 /*
59  * Begin of PMAG-AA framebuffer memory relative to TC slot address,
60  * resolution is 1280x1024x1 (8 bits deep, but only LSB is used).
61  */
62 #define PMAG_AA_ONBOARD_FBMEM_OFFSET	0x200000
63 
64 struct aafb_par {
65 	void __iomem *mmio;
66 	struct bt455_regs __iomem *bt455;
67 	struct bt431_regs __iomem *bt431;
68 };
69 
70 static const struct fb_var_screeninfo aafb_defined = {
71 	.xres		= 1280,
72 	.yres		= 1024,
73 	.xres_virtual	= 2048,
74 	.yres_virtual	= 1024,
75 	.bits_per_pixel	= 8,
76 	.grayscale	= 1,
77 	.red.length	= 0,
78 	.green.length	= 1,
79 	.blue.length	= 0,
80 	.activate	= FB_ACTIVATE_NOW,
81 	.accel_flags	= FB_ACCEL_NONE,
82 	.pixclock	= 7645,
83 	.left_margin	= 224,
84 	.right_margin	= 32,
85 	.upper_margin	= 33,
86 	.lower_margin	= 3,
87 	.hsync_len	= 160,
88 	.vsync_len	= 3,
89 	.sync		= FB_SYNC_ON_GREEN,
90 	.vmode		= FB_VMODE_NONINTERLACED,
91 };
92 
93 static const struct fb_fix_screeninfo aafb_fix = {
94 	.id		= "PMAG-AA",
95 	.smem_len	= (2048 * 1024),
96 	.type		= FB_TYPE_PACKED_PIXELS,
97 	.visual		= FB_VISUAL_MONO10,
98 	.ypanstep	= 1,
99 	.ywrapstep	= 1,
100 	.line_length	= 2048,
101 	.mmio_len	= PMAG_AA_ONBOARD_FBMEM_OFFSET - PMAG_AA_BT455_OFFSET,
102 };
103 
aafb_cursor(struct fb_info * info,struct fb_cursor * cursor)104 static int aafb_cursor(struct fb_info *info, struct fb_cursor *cursor)
105 {
106 	struct aafb_par *par = info->par;
107 
108 	if (cursor->image.height > BT431_CURSOR_SIZE ||
109 	    cursor->image.width > BT431_CURSOR_SIZE) {
110 		bt431_erase_cursor(par->bt431);
111 		return -EINVAL;
112 	}
113 
114 	if (!cursor->enable)
115 		bt431_erase_cursor(par->bt431);
116 
117 	if (cursor->set & FB_CUR_SETPOS)
118 		bt431_position_cursor(par->bt431,
119 				      cursor->image.dx, cursor->image.dy);
120 	if (cursor->set & FB_CUR_SETCMAP) {
121 		u8 fg = cursor->image.fg_color ? 0xf : 0x0;
122 		u8 bg = cursor->image.bg_color ? 0xf : 0x0;
123 
124 		bt455_write_cmap_entry(par->bt455, 8, bg);
125 		bt455_write_cmap_next(par->bt455, bg);
126 		bt455_write_ovly_next(par->bt455, fg);
127 	}
128 	if (cursor->set & (FB_CUR_SETSIZE | FB_CUR_SETSHAPE | FB_CUR_SETIMAGE))
129 		bt431_set_cursor(par->bt431,
130 				 cursor->image.data, cursor->mask, cursor->rop,
131 				 cursor->image.width, cursor->image.height);
132 
133 	if (cursor->enable)
134 		bt431_enable_cursor(par->bt431);
135 
136 	return 0;
137 }
138 
139 /* 0 unblanks, any other blanks. */
140 
aafb_blank(int blank,struct fb_info * info)141 static int aafb_blank(int blank, struct fb_info *info)
142 {
143 	struct aafb_par *par = info->par;
144 	u8 val = blank ? 0x00 : 0x0f;
145 
146 	bt455_write_cmap_entry(par->bt455, 1, val);
147 	return 0;
148 }
149 
150 static const struct fb_ops aafb_ops = {
151 	.owner		= THIS_MODULE,
152 	FB_DEFAULT_IOMEM_OPS,
153 	.fb_blank	= aafb_blank,
154 	.fb_cursor	= aafb_cursor,
155 };
156 
pmagaafb_probe(struct device * dev)157 static int pmagaafb_probe(struct device *dev)
158 {
159 	struct tc_dev *tdev = to_tc_dev(dev);
160 	resource_size_t start, len;
161 	struct fb_info *info;
162 	struct aafb_par *par;
163 	int err;
164 
165 	info = framebuffer_alloc(sizeof(struct aafb_par), dev);
166 	if (!info)
167 		return -ENOMEM;
168 
169 	par = info->par;
170 	dev_set_drvdata(dev, info);
171 
172 	info->fbops = &aafb_ops;
173 	info->fix = aafb_fix;
174 	info->var = aafb_defined;
175 
176 	/* Request the I/O MEM resource. */
177 	start = tdev->resource.start;
178 	len = tdev->resource.end - start + 1;
179 	if (!request_mem_region(start, len, dev_name(dev))) {
180 		printk(KERN_ERR "%s: Cannot reserve FB region\n",
181 		       dev_name(dev));
182 		err = -EBUSY;
183 		goto err_alloc;
184 	}
185 
186 	/* MMIO mapping setup. */
187 	info->fix.mmio_start = start + PMAG_AA_BT455_OFFSET;
188 	par->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
189 	if (!par->mmio) {
190 		printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
191 		err = -ENOMEM;
192 		goto err_resource;
193 	}
194 	par->bt455 = par->mmio - PMAG_AA_BT455_OFFSET + PMAG_AA_BT455_OFFSET;
195 	par->bt431 = par->mmio - PMAG_AA_BT455_OFFSET + PMAG_AA_BT431_OFFSET;
196 
197 	/* Frame buffer mapping setup. */
198 	info->fix.smem_start = start + PMAG_AA_ONBOARD_FBMEM_OFFSET;
199 	info->screen_base = ioremap(info->fix.smem_start,
200 					    info->fix.smem_len);
201 	if (!info->screen_base) {
202 		printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
203 		err = -ENOMEM;
204 		goto err_mmio_map;
205 	}
206 	info->screen_size = info->fix.smem_len;
207 
208 	/* Init colormap. */
209 	bt455_write_cmap_entry(par->bt455, 0, 0x0);
210 	bt455_write_cmap_next(par->bt455, 0xf);
211 
212 	/* Init hardware cursor. */
213 	bt431_erase_cursor(par->bt431);
214 	bt431_init_cursor(par->bt431);
215 
216 	err = register_framebuffer(info);
217 	if (err < 0) {
218 		printk(KERN_ERR "%s: Cannot register framebuffer\n",
219 		       dev_name(dev));
220 		goto err_smem_map;
221 	}
222 
223 	get_device(dev);
224 
225 	pr_info("fb%d: %s frame buffer device at %s\n",
226 		info->node, info->fix.id, dev_name(dev));
227 
228 	return 0;
229 
230 
231 err_smem_map:
232 	iounmap(info->screen_base);
233 
234 err_mmio_map:
235 	iounmap(par->mmio);
236 
237 err_resource:
238 	release_mem_region(start, len);
239 
240 err_alloc:
241 	framebuffer_release(info);
242 	return err;
243 }
244 
pmagaafb_remove(struct device * dev)245 static int pmagaafb_remove(struct device *dev)
246 {
247 	struct tc_dev *tdev = to_tc_dev(dev);
248 	struct fb_info *info = dev_get_drvdata(dev);
249 	struct aafb_par *par = info->par;
250 	resource_size_t start, len;
251 
252 	put_device(dev);
253 	unregister_framebuffer(info);
254 	iounmap(info->screen_base);
255 	iounmap(par->mmio);
256 	start = tdev->resource.start;
257 	len = tdev->resource.end - start + 1;
258 	release_mem_region(start, len);
259 	framebuffer_release(info);
260 	return 0;
261 }
262 
263 /*
264  * Initialise the framebuffer.
265  */
266 static const struct tc_device_id pmagaafb_tc_table[] = {
267 	{ "DEC     ", "PMAG-AA " },
268 	{ }
269 };
270 MODULE_DEVICE_TABLE(tc, pmagaafb_tc_table);
271 
272 static struct tc_driver pmagaafb_driver = {
273 	.id_table	= pmagaafb_tc_table,
274 	.driver		= {
275 		.name	= "pmagaafb",
276 		.bus	= &tc_bus_type,
277 		.probe	= pmagaafb_probe,
278 		.remove	= pmagaafb_remove,
279 	},
280 };
281 
pmagaafb_init(void)282 static int __init pmagaafb_init(void)
283 {
284 #ifndef MODULE
285 	if (fb_get_options("pmagaafb", NULL))
286 		return -ENXIO;
287 #endif
288 	return tc_register_driver(&pmagaafb_driver);
289 }
290 
pmagaafb_exit(void)291 static void __exit pmagaafb_exit(void)
292 {
293 	tc_unregister_driver(&pmagaafb_driver);
294 }
295 
296 module_init(pmagaafb_init);
297 module_exit(pmagaafb_exit);
298 
299 MODULE_AUTHOR(DRIVER_AUTHOR);
300 MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
301 MODULE_LICENSE("GPL");
302