1 /*
2 * linux/drivers/video/pmagb-b-fb.c
3 *
4 * PMAGB-B TURBOchannel Smart Frame Buffer (SFB) 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 * DECstation related code Copyright (C) 1999, 2000, 2001 by
11 * Michael Engel <engel@unix-ag.org>,
12 * Karsten Merker <merker@linuxtag.org> and
13 * Harald Koerfgen.
14 * Copyright (c) 2005, 2006 Maciej W. Rozycki
15 *
16 * This file is subject to the terms and conditions of the GNU General
17 * Public License. See the file COPYING in the main directory of this
18 * archive for more details.
19 */
20
21 #include <linux/compiler.h>
22 #include <linux/delay.h>
23 #include <linux/errno.h>
24 #include <linux/fb.h>
25 #include <linux/init.h>
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/tc.h>
29 #include <linux/types.h>
30
31 #include <asm/io.h>
32
33 #include <video/pmagb-b-fb.h>
34
35
36 struct pmagbbfb_par {
37 volatile void __iomem *mmio;
38 volatile void __iomem *smem;
39 volatile u32 __iomem *sfb;
40 volatile u32 __iomem *dac;
41 unsigned int osc0;
42 unsigned int osc1;
43 int slot;
44 };
45
46
47 static const struct fb_var_screeninfo pmagbbfb_defined = {
48 .bits_per_pixel = 8,
49 .red.length = 8,
50 .green.length = 8,
51 .blue.length = 8,
52 .activate = FB_ACTIVATE_NOW,
53 .height = -1,
54 .width = -1,
55 .accel_flags = FB_ACCEL_NONE,
56 .sync = FB_SYNC_ON_GREEN,
57 .vmode = FB_VMODE_NONINTERLACED,
58 };
59
60 static const struct fb_fix_screeninfo pmagbbfb_fix = {
61 .id = "PMAGB-BA",
62 .smem_len = (2048 * 1024),
63 .type = FB_TYPE_PACKED_PIXELS,
64 .visual = FB_VISUAL_PSEUDOCOLOR,
65 .mmio_len = PMAGB_B_FBMEM,
66 };
67
68
sfb_write(struct pmagbbfb_par * par,unsigned int reg,u32 v)69 static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v)
70 {
71 writel(v, par->sfb + reg / 4);
72 }
73
sfb_read(struct pmagbbfb_par * par,unsigned int reg)74 static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg)
75 {
76 return readl(par->sfb + reg / 4);
77 }
78
dac_write(struct pmagbbfb_par * par,unsigned int reg,u8 v)79 static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v)
80 {
81 writeb(v, par->dac + reg / 4);
82 }
83
dac_read(struct pmagbbfb_par * par,unsigned int reg)84 static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg)
85 {
86 return readb(par->dac + reg / 4);
87 }
88
gp0_write(struct pmagbbfb_par * par,u32 v)89 static inline void gp0_write(struct pmagbbfb_par *par, u32 v)
90 {
91 writel(v, par->mmio + PMAGB_B_GP0);
92 }
93
94
95 /*
96 * Set the palette.
97 */
pmagbbfb_setcolreg(unsigned int regno,unsigned int red,unsigned int green,unsigned int blue,unsigned int transp,struct fb_info * info)98 static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red,
99 unsigned int green, unsigned int blue,
100 unsigned int transp, struct fb_info *info)
101 {
102 struct pmagbbfb_par *par = info->par;
103
104 if (regno >= info->cmap.len)
105 return 1;
106
107 red >>= 8; /* The cmap fields are 16 bits */
108 green >>= 8; /* wide, but the hardware colormap */
109 blue >>= 8; /* registers are only 8 bits wide */
110
111 mb();
112 dac_write(par, BT459_ADDR_LO, regno);
113 dac_write(par, BT459_ADDR_HI, 0x00);
114 wmb();
115 dac_write(par, BT459_CMAP, red);
116 wmb();
117 dac_write(par, BT459_CMAP, green);
118 wmb();
119 dac_write(par, BT459_CMAP, blue);
120
121 return 0;
122 }
123
124 static struct fb_ops pmagbbfb_ops = {
125 .owner = THIS_MODULE,
126 .fb_setcolreg = pmagbbfb_setcolreg,
127 .fb_fillrect = cfb_fillrect,
128 .fb_copyarea = cfb_copyarea,
129 .fb_imageblit = cfb_imageblit,
130 };
131
132
133 /*
134 * Turn the hardware cursor off.
135 */
pmagbbfb_erase_cursor(struct fb_info * info)136 static void pmagbbfb_erase_cursor(struct fb_info *info)
137 {
138 struct pmagbbfb_par *par = info->par;
139
140 mb();
141 dac_write(par, BT459_ADDR_LO, 0x00);
142 dac_write(par, BT459_ADDR_HI, 0x03);
143 wmb();
144 dac_write(par, BT459_DATA, 0x00);
145 }
146
147 /*
148 * Set up screen parameters.
149 */
pmagbbfb_screen_setup(struct fb_info * info)150 static void pmagbbfb_screen_setup(struct fb_info *info)
151 {
152 struct pmagbbfb_par *par = info->par;
153
154 info->var.xres = ((sfb_read(par, SFB_REG_VID_HOR) >>
155 SFB_VID_HOR_PIX_SHIFT) & SFB_VID_HOR_PIX_MASK) * 4;
156 info->var.xres_virtual = info->var.xres;
157 info->var.yres = (sfb_read(par, SFB_REG_VID_VER) >>
158 SFB_VID_VER_SL_SHIFT) & SFB_VID_VER_SL_MASK;
159 info->var.yres_virtual = info->var.yres;
160 info->var.left_margin = ((sfb_read(par, SFB_REG_VID_HOR) >>
161 SFB_VID_HOR_BP_SHIFT) &
162 SFB_VID_HOR_BP_MASK) * 4;
163 info->var.right_margin = ((sfb_read(par, SFB_REG_VID_HOR) >>
164 SFB_VID_HOR_FP_SHIFT) &
165 SFB_VID_HOR_FP_MASK) * 4;
166 info->var.upper_margin = (sfb_read(par, SFB_REG_VID_VER) >>
167 SFB_VID_VER_BP_SHIFT) & SFB_VID_VER_BP_MASK;
168 info->var.lower_margin = (sfb_read(par, SFB_REG_VID_VER) >>
169 SFB_VID_VER_FP_SHIFT) & SFB_VID_VER_FP_MASK;
170 info->var.hsync_len = ((sfb_read(par, SFB_REG_VID_HOR) >>
171 SFB_VID_HOR_SYN_SHIFT) &
172 SFB_VID_HOR_SYN_MASK) * 4;
173 info->var.vsync_len = (sfb_read(par, SFB_REG_VID_VER) >>
174 SFB_VID_VER_SYN_SHIFT) & SFB_VID_VER_SYN_MASK;
175
176 info->fix.line_length = info->var.xres;
177 };
178
179 /*
180 * Determine oscillator configuration.
181 */
pmagbbfb_osc_setup(struct fb_info * info)182 static void pmagbbfb_osc_setup(struct fb_info *info)
183 {
184 static unsigned int pmagbbfb_freqs[] = {
185 130808, 119843, 104000, 92980, 74370, 72800,
186 69197, 66000, 65000, 50350, 36000, 32000, 25175
187 };
188 struct pmagbbfb_par *par = info->par;
189 struct tc_bus *tbus = to_tc_dev(info->device)->bus;
190 u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8;
191 u32 freq0, freq1, freqtc = tc_get_speed(tbus) / 250;
192 int i, j;
193
194 gp0_write(par, 0); /* select Osc0 */
195 for (j = 0; j < 16; j++) {
196 mb();
197 sfb_write(par, SFB_REG_TCCLK_COUNT, 0);
198 mb();
199 for (i = 0; i < 100; i++) { /* nominally max. 20.5us */
200 if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0)
201 break;
202 udelay(1);
203 }
204 count0 += sfb_read(par, SFB_REG_VIDCLK_COUNT);
205 }
206
207 gp0_write(par, 1); /* select Osc1 */
208 for (j = 0; j < 16; j++) {
209 mb();
210 sfb_write(par, SFB_REG_TCCLK_COUNT, 0);
211
212 for (i = 0; i < 100; i++) { /* nominally max. 20.5us */
213 if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0)
214 break;
215 udelay(1);
216 }
217 count1 += sfb_read(par, SFB_REG_VIDCLK_COUNT);
218 }
219
220 freq0 = (freqtc * count0 + counttc / 2) / counttc;
221 par->osc0 = freq0;
222 if (freq0 >= pmagbbfb_freqs[0] - (pmagbbfb_freqs[0] + 32) / 64 &&
223 freq0 <= pmagbbfb_freqs[0] + (pmagbbfb_freqs[0] + 32) / 64)
224 par->osc0 = pmagbbfb_freqs[0];
225
226 freq1 = (par->osc0 * count1 + count0 / 2) / count0;
227 par->osc1 = freq1;
228 for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++)
229 if (freq1 >= pmagbbfb_freqs[i] -
230 (pmagbbfb_freqs[i] + 128) / 256 &&
231 freq1 <= pmagbbfb_freqs[i] +
232 (pmagbbfb_freqs[i] + 128) / 256) {
233 par->osc1 = pmagbbfb_freqs[i];
234 break;
235 }
236
237 if (par->osc0 - par->osc1 <= (par->osc0 + par->osc1 + 256) / 512 ||
238 par->osc1 - par->osc0 <= (par->osc0 + par->osc1 + 256) / 512)
239 par->osc1 = 0;
240
241 gp0_write(par, par->osc1 != 0); /* reselect OscX */
242
243 info->var.pixclock = par->osc1 ?
244 (1000000000 + par->osc1 / 2) / par->osc1 :
245 (1000000000 + par->osc0 / 2) / par->osc0;
246 };
247
248
pmagbbfb_probe(struct device * dev)249 static int pmagbbfb_probe(struct device *dev)
250 {
251 struct tc_dev *tdev = to_tc_dev(dev);
252 resource_size_t start, len;
253 struct fb_info *info;
254 struct pmagbbfb_par *par;
255 char freq0[12], freq1[12];
256 u32 vid_base;
257 int err;
258
259 info = framebuffer_alloc(sizeof(struct pmagbbfb_par), dev);
260 if (!info)
261 return -ENOMEM;
262
263 par = info->par;
264 dev_set_drvdata(dev, info);
265
266 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
267 printk(KERN_ERR "%s: Cannot allocate color map\n",
268 dev_name(dev));
269 err = -ENOMEM;
270 goto err_alloc;
271 }
272
273 info->fbops = &pmagbbfb_ops;
274 info->fix = pmagbbfb_fix;
275 info->var = pmagbbfb_defined;
276 info->flags = FBINFO_DEFAULT;
277
278 /* Request the I/O MEM resource. */
279 start = tdev->resource.start;
280 len = tdev->resource.end - start + 1;
281 if (!request_mem_region(start, len, dev_name(dev))) {
282 printk(KERN_ERR "%s: Cannot reserve FB region\n",
283 dev_name(dev));
284 err = -EBUSY;
285 goto err_cmap;
286 }
287
288 /* MMIO mapping setup. */
289 info->fix.mmio_start = start;
290 par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
291 if (!par->mmio) {
292 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
293 err = -ENOMEM;
294 goto err_resource;
295 }
296 par->sfb = par->mmio + PMAGB_B_SFB;
297 par->dac = par->mmio + PMAGB_B_BT459;
298
299 /* Frame buffer mapping setup. */
300 info->fix.smem_start = start + PMAGB_B_FBMEM;
301 par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
302 if (!par->smem) {
303 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
304 err = -ENOMEM;
305 goto err_mmio_map;
306 }
307 vid_base = sfb_read(par, SFB_REG_VID_BASE);
308 info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000;
309 info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000;
310
311 pmagbbfb_erase_cursor(info);
312 pmagbbfb_screen_setup(info);
313 pmagbbfb_osc_setup(info);
314
315 err = register_framebuffer(info);
316 if (err < 0) {
317 printk(KERN_ERR "%s: Cannot register framebuffer\n",
318 dev_name(dev));
319 goto err_smem_map;
320 }
321
322 get_device(dev);
323
324 snprintf(freq0, sizeof(freq0), "%u.%03uMHz",
325 par->osc0 / 1000, par->osc0 % 1000);
326 snprintf(freq1, sizeof(freq1), "%u.%03uMHz",
327 par->osc1 / 1000, par->osc1 % 1000);
328
329 fb_info(info, "%s frame buffer device at %s\n",
330 info->fix.id, dev_name(dev));
331 fb_info(info, "Osc0: %s, Osc1: %s, Osc%u selected\n",
332 freq0, par->osc1 ? freq1 : "disabled", par->osc1 != 0);
333
334 return 0;
335
336
337 err_smem_map:
338 iounmap(par->smem);
339
340 err_mmio_map:
341 iounmap(par->mmio);
342
343 err_resource:
344 release_mem_region(start, len);
345
346 err_cmap:
347 fb_dealloc_cmap(&info->cmap);
348
349 err_alloc:
350 framebuffer_release(info);
351 return err;
352 }
353
pmagbbfb_remove(struct device * dev)354 static int pmagbbfb_remove(struct device *dev)
355 {
356 struct tc_dev *tdev = to_tc_dev(dev);
357 struct fb_info *info = dev_get_drvdata(dev);
358 struct pmagbbfb_par *par = info->par;
359 resource_size_t start, len;
360
361 put_device(dev);
362 unregister_framebuffer(info);
363 iounmap(par->smem);
364 iounmap(par->mmio);
365 start = tdev->resource.start;
366 len = tdev->resource.end - start + 1;
367 release_mem_region(start, len);
368 fb_dealloc_cmap(&info->cmap);
369 framebuffer_release(info);
370 return 0;
371 }
372
373
374 /*
375 * Initialize the framebuffer.
376 */
377 static const struct tc_device_id pmagbbfb_tc_table[] = {
378 { "DEC ", "PMAGB-BA" },
379 { }
380 };
381 MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table);
382
383 static struct tc_driver pmagbbfb_driver = {
384 .id_table = pmagbbfb_tc_table,
385 .driver = {
386 .name = "pmagbbfb",
387 .bus = &tc_bus_type,
388 .probe = pmagbbfb_probe,
389 .remove = pmagbbfb_remove,
390 },
391 };
392
pmagbbfb_init(void)393 static int __init pmagbbfb_init(void)
394 {
395 #ifndef MODULE
396 if (fb_get_options("pmagbbfb", NULL))
397 return -ENXIO;
398 #endif
399 return tc_register_driver(&pmagbbfb_driver);
400 }
401
pmagbbfb_exit(void)402 static void __exit pmagbbfb_exit(void)
403 {
404 tc_unregister_driver(&pmagbbfb_driver);
405 }
406
407
408 module_init(pmagbbfb_init);
409 module_exit(pmagbbfb_exit);
410
411 MODULE_LICENSE("GPL");
412
