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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 | |
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 | |
74 | static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg) |
75 | { |
76 | return readl(par->sfb + reg / 4); |
77 | } |
78 | |
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 | |
84 | static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg) |
85 | { |
86 | return readb(par->dac + reg / 4); |
87 | } |
88 | |
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 | */ |
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 | */ |
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 | */ |
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 | */ |
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 | |
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 | printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev)); |
262 | return -ENOMEM; |
263 | } |
264 | |
265 | par = info->par; |
266 | dev_set_drvdata(dev, info); |
267 | |
268 | if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { |
269 | printk(KERN_ERR "%s: Cannot allocate color map\n", |
270 | dev_name(dev)); |
271 | err = -ENOMEM; |
272 | goto err_alloc; |
273 | } |
274 | |
275 | info->fbops = &pmagbbfb_ops; |
276 | info->fix = pmagbbfb_fix; |
277 | info->var = pmagbbfb_defined; |
278 | info->flags = FBINFO_DEFAULT; |
279 | |
280 | /* Request the I/O MEM resource. */ |
281 | start = tdev->resource.start; |
282 | len = tdev->resource.end - start + 1; |
283 | if (!request_mem_region(start, len, dev_name(dev))) { |
284 | printk(KERN_ERR "%s: Cannot reserve FB region\n", |
285 | dev_name(dev)); |
286 | err = -EBUSY; |
287 | goto err_cmap; |
288 | } |
289 | |
290 | /* MMIO mapping setup. */ |
291 | info->fix.mmio_start = start; |
292 | par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len); |
293 | if (!par->mmio) { |
294 | printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev)); |
295 | err = -ENOMEM; |
296 | goto err_resource; |
297 | } |
298 | par->sfb = par->mmio + PMAGB_B_SFB; |
299 | par->dac = par->mmio + PMAGB_B_BT459; |
300 | |
301 | /* Frame buffer mapping setup. */ |
302 | info->fix.smem_start = start + PMAGB_B_FBMEM; |
303 | par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len); |
304 | if (!par->smem) { |
305 | printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev)); |
306 | err = -ENOMEM; |
307 | goto err_mmio_map; |
308 | } |
309 | vid_base = sfb_read(par, SFB_REG_VID_BASE); |
310 | info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000; |
311 | info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000; |
312 | |
313 | pmagbbfb_erase_cursor(info); |
314 | pmagbbfb_screen_setup(info); |
315 | pmagbbfb_osc_setup(info); |
316 | |
317 | err = register_framebuffer(info); |
318 | if (err < 0) { |
319 | printk(KERN_ERR "%s: Cannot register framebuffer\n", |
320 | dev_name(dev)); |
321 | goto err_smem_map; |
322 | } |
323 | |
324 | get_device(dev); |
325 | |
326 | snprintf(freq0, sizeof(freq0), "%u.%03uMHz", |
327 | par->osc0 / 1000, par->osc0 % 1000); |
328 | snprintf(freq1, sizeof(freq1), "%u.%03uMHz", |
329 | par->osc1 / 1000, par->osc1 % 1000); |
330 | |
331 | fb_info(info, "%s frame buffer device at %s\n", |
332 | info->fix.id, dev_name(dev)); |
333 | fb_info(info, "Osc0: %s, Osc1: %s, Osc%u selected\n", |
334 | freq0, par->osc1 ? freq1 : "disabled", par->osc1 != 0); |
335 | |
336 | return 0; |
337 | |
338 | |
339 | err_smem_map: |
340 | iounmap(par->smem); |
341 | |
342 | err_mmio_map: |
343 | iounmap(par->mmio); |
344 | |
345 | err_resource: |
346 | release_mem_region(start, len); |
347 | |
348 | err_cmap: |
349 | fb_dealloc_cmap(&info->cmap); |
350 | |
351 | err_alloc: |
352 | framebuffer_release(info); |
353 | return err; |
354 | } |
355 | |
356 | static int pmagbbfb_remove(struct device *dev) |
357 | { |
358 | struct tc_dev *tdev = to_tc_dev(dev); |
359 | struct fb_info *info = dev_get_drvdata(dev); |
360 | struct pmagbbfb_par *par = info->par; |
361 | resource_size_t start, len; |
362 | |
363 | put_device(dev); |
364 | unregister_framebuffer(info); |
365 | iounmap(par->smem); |
366 | iounmap(par->mmio); |
367 | start = tdev->resource.start; |
368 | len = tdev->resource.end - start + 1; |
369 | release_mem_region(start, len); |
370 | fb_dealloc_cmap(&info->cmap); |
371 | framebuffer_release(info); |
372 | return 0; |
373 | } |
374 | |
375 | |
376 | /* |
377 | * Initialize the framebuffer. |
378 | */ |
379 | static const struct tc_device_id pmagbbfb_tc_table[] = { |
380 | { "DEC ", "PMAGB-BA"}, |
381 | { } |
382 | }; |
383 | MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table); |
384 | |
385 | static struct tc_driver pmagbbfb_driver = { |
386 | .id_table = pmagbbfb_tc_table, |
387 | .driver = { |
388 | .name = "pmagbbfb", |
389 | .bus = &tc_bus_type, |
390 | .probe = pmagbbfb_probe, |
391 | .remove = pmagbbfb_remove, |
392 | }, |
393 | }; |
394 | |
395 | static int __init pmagbbfb_init(void) |
396 | { |
397 | #ifndef MODULE |
398 | if (fb_get_options("pmagbbfb", NULL)) |
399 | return -ENXIO; |
400 | #endif |
401 | return tc_register_driver(&pmagbbfb_driver); |
402 | } |
403 | |
404 | static void __exit pmagbbfb_exit(void) |
405 | { |
406 | tc_unregister_driver(&pmagbbfb_driver); |
407 | } |
408 | |
409 | |
410 | module_init(pmagbbfb_init); |
411 | module_exit(pmagbbfb_exit); |
412 | |
413 | MODULE_LICENSE("GPL"); |
414 |
Warning: That file was not part of the compilation database. It may have many parsing errors.