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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 | #include <asm/system.h> |
33 | |
34 | #include <video/pmagb-b-fb.h> |
35 | |
36 | |
37 | struct pmagbbfb_par { |
38 | volatile void __iomem *mmio; |
39 | volatile void __iomem *smem; |
40 | volatile u32 __iomem *sfb; |
41 | volatile u32 __iomem *dac; |
42 | unsigned int osc0; |
43 | unsigned int osc1; |
44 | int slot; |
45 | }; |
46 | |
47 | |
48 | static struct fb_var_screeninfo pmagbbfb_defined __initdata = { |
49 | .bits_per_pixel = 8, |
50 | .red.length = 8, |
51 | .green.length = 8, |
52 | .blue.length = 8, |
53 | .activate = FB_ACTIVATE_NOW, |
54 | .height = -1, |
55 | .width = -1, |
56 | .accel_flags = FB_ACCEL_NONE, |
57 | .sync = FB_SYNC_ON_GREEN, |
58 | .vmode = FB_VMODE_NONINTERLACED, |
59 | }; |
60 | |
61 | static struct fb_fix_screeninfo pmagbbfb_fix __initdata = { |
62 | .id = "PMAGB-BA", |
63 | .smem_len = (2048 * 1024), |
64 | .type = FB_TYPE_PACKED_PIXELS, |
65 | .visual = FB_VISUAL_PSEUDOCOLOR, |
66 | .mmio_len = PMAGB_B_FBMEM, |
67 | }; |
68 | |
69 | |
70 | static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v) |
71 | { |
72 | writel(v, par->sfb + reg / 4); |
73 | } |
74 | |
75 | static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg) |
76 | { |
77 | return readl(par->sfb + reg / 4); |
78 | } |
79 | |
80 | static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v) |
81 | { |
82 | writeb(v, par->dac + reg / 4); |
83 | } |
84 | |
85 | static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg) |
86 | { |
87 | return readb(par->dac + reg / 4); |
88 | } |
89 | |
90 | static inline void gp0_write(struct pmagbbfb_par *par, u32 v) |
91 | { |
92 | writel(v, par->mmio + PMAGB_B_GP0); |
93 | } |
94 | |
95 | |
96 | /* |
97 | * Set the palette. |
98 | */ |
99 | static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red, |
100 | unsigned int green, unsigned int blue, |
101 | unsigned int transp, struct fb_info *info) |
102 | { |
103 | struct pmagbbfb_par *par = info->par; |
104 | |
105 | if (regno >= info->cmap.len) |
106 | return 1; |
107 | |
108 | red >>= 8; /* The cmap fields are 16 bits */ |
109 | green >>= 8; /* wide, but the hardware colormap */ |
110 | blue >>= 8; /* registers are only 8 bits wide */ |
111 | |
112 | mb(); |
113 | dac_write(par, BT459_ADDR_LO, regno); |
114 | dac_write(par, BT459_ADDR_HI, 0x00); |
115 | wmb(); |
116 | dac_write(par, BT459_CMAP, red); |
117 | wmb(); |
118 | dac_write(par, BT459_CMAP, green); |
119 | wmb(); |
120 | dac_write(par, BT459_CMAP, blue); |
121 | |
122 | return 0; |
123 | } |
124 | |
125 | static struct fb_ops pmagbbfb_ops = { |
126 | .owner = THIS_MODULE, |
127 | .fb_setcolreg = pmagbbfb_setcolreg, |
128 | .fb_fillrect = cfb_fillrect, |
129 | .fb_copyarea = cfb_copyarea, |
130 | .fb_imageblit = cfb_imageblit, |
131 | }; |
132 | |
133 | |
134 | /* |
135 | * Turn the hardware cursor off. |
136 | */ |
137 | static void __init pmagbbfb_erase_cursor(struct fb_info *info) |
138 | { |
139 | struct pmagbbfb_par *par = info->par; |
140 | |
141 | mb(); |
142 | dac_write(par, BT459_ADDR_LO, 0x00); |
143 | dac_write(par, BT459_ADDR_HI, 0x03); |
144 | wmb(); |
145 | dac_write(par, BT459_DATA, 0x00); |
146 | } |
147 | |
148 | /* |
149 | * Set up screen parameters. |
150 | */ |
151 | static void __init pmagbbfb_screen_setup(struct fb_info *info) |
152 | { |
153 | struct pmagbbfb_par *par = info->par; |
154 | |
155 | info->var.xres = ((sfb_read(par, SFB_REG_VID_HOR) >> |
156 | SFB_VID_HOR_PIX_SHIFT) & SFB_VID_HOR_PIX_MASK) * 4; |
157 | info->var.xres_virtual = info->var.xres; |
158 | info->var.yres = (sfb_read(par, SFB_REG_VID_VER) >> |
159 | SFB_VID_VER_SL_SHIFT) & SFB_VID_VER_SL_MASK; |
160 | info->var.yres_virtual = info->var.yres; |
161 | info->var.left_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> |
162 | SFB_VID_HOR_BP_SHIFT) & |
163 | SFB_VID_HOR_BP_MASK) * 4; |
164 | info->var.right_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> |
165 | SFB_VID_HOR_FP_SHIFT) & |
166 | SFB_VID_HOR_FP_MASK) * 4; |
167 | info->var.upper_margin = (sfb_read(par, SFB_REG_VID_VER) >> |
168 | SFB_VID_VER_BP_SHIFT) & SFB_VID_VER_BP_MASK; |
169 | info->var.lower_margin = (sfb_read(par, SFB_REG_VID_VER) >> |
170 | SFB_VID_VER_FP_SHIFT) & SFB_VID_VER_FP_MASK; |
171 | info->var.hsync_len = ((sfb_read(par, SFB_REG_VID_HOR) >> |
172 | SFB_VID_HOR_SYN_SHIFT) & |
173 | SFB_VID_HOR_SYN_MASK) * 4; |
174 | info->var.vsync_len = (sfb_read(par, SFB_REG_VID_VER) >> |
175 | SFB_VID_VER_SYN_SHIFT) & SFB_VID_VER_SYN_MASK; |
176 | |
177 | info->fix.line_length = info->var.xres; |
178 | }; |
179 | |
180 | /* |
181 | * Determine oscillator configuration. |
182 | */ |
183 | static void __init pmagbbfb_osc_setup(struct fb_info *info) |
184 | { |
185 | static unsigned int pmagbbfb_freqs[] __initdata = { |
186 | 130808, 119843, 104000, 92980, 74370, 72800, |
187 | 69197, 66000, 65000, 50350, 36000, 32000, 25175 |
188 | }; |
189 | struct pmagbbfb_par *par = info->par; |
190 | struct tc_bus *tbus = to_tc_dev(info->device)->bus; |
191 | u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8; |
192 | u32 freq0, freq1, freqtc = tc_get_speed(tbus) / 250; |
193 | int i, j; |
194 | |
195 | gp0_write(par, 0); /* select Osc0 */ |
196 | for (j = 0; j < 16; j++) { |
197 | mb(); |
198 | sfb_write(par, SFB_REG_TCCLK_COUNT, 0); |
199 | mb(); |
200 | for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ |
201 | if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) |
202 | break; |
203 | udelay(1); |
204 | } |
205 | count0 += sfb_read(par, SFB_REG_VIDCLK_COUNT); |
206 | } |
207 | |
208 | gp0_write(par, 1); /* select Osc1 */ |
209 | for (j = 0; j < 16; j++) { |
210 | mb(); |
211 | sfb_write(par, SFB_REG_TCCLK_COUNT, 0); |
212 | |
213 | for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ |
214 | if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) |
215 | break; |
216 | udelay(1); |
217 | } |
218 | count1 += sfb_read(par, SFB_REG_VIDCLK_COUNT); |
219 | } |
220 | |
221 | freq0 = (freqtc * count0 + counttc / 2) / counttc; |
222 | par->osc0 = freq0; |
223 | if (freq0 >= pmagbbfb_freqs[0] - (pmagbbfb_freqs[0] + 32) / 64 && |
224 | freq0 <= pmagbbfb_freqs[0] + (pmagbbfb_freqs[0] + 32) / 64) |
225 | par->osc0 = pmagbbfb_freqs[0]; |
226 | |
227 | freq1 = (par->osc0 * count1 + count0 / 2) / count0; |
228 | par->osc1 = freq1; |
229 | for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++) |
230 | if (freq1 >= pmagbbfb_freqs[i] - |
231 | (pmagbbfb_freqs[i] + 128) / 256 && |
232 | freq1 <= pmagbbfb_freqs[i] + |
233 | (pmagbbfb_freqs[i] + 128) / 256) { |
234 | par->osc1 = pmagbbfb_freqs[i]; |
235 | break; |
236 | } |
237 | |
238 | if (par->osc0 - par->osc1 <= (par->osc0 + par->osc1 + 256) / 512 || |
239 | par->osc1 - par->osc0 <= (par->osc0 + par->osc1 + 256) / 512) |
240 | par->osc1 = 0; |
241 | |
242 | gp0_write(par, par->osc1 != 0); /* reselect OscX */ |
243 | |
244 | info->var.pixclock = par->osc1 ? |
245 | (1000000000 + par->osc1 / 2) / par->osc1 : |
246 | (1000000000 + par->osc0 / 2) / par->osc0; |
247 | }; |
248 | |
249 | |
250 | static int __init pmagbbfb_probe(struct device *dev) |
251 | { |
252 | struct tc_dev *tdev = to_tc_dev(dev); |
253 | resource_size_t start, len; |
254 | struct fb_info *info; |
255 | struct pmagbbfb_par *par; |
256 | char freq0[12], freq1[12]; |
257 | u32 vid_base; |
258 | int err; |
259 | |
260 | info = framebuffer_alloc(sizeof(struct pmagbbfb_par), dev); |
261 | if (!info) { |
262 | printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev)); |
263 | return -ENOMEM; |
264 | } |
265 | |
266 | par = info->par; |
267 | dev_set_drvdata(dev, info); |
268 | |
269 | if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { |
270 | printk(KERN_ERR "%s: Cannot allocate color map\n", |
271 | dev_name(dev)); |
272 | err = -ENOMEM; |
273 | goto err_alloc; |
274 | } |
275 | |
276 | info->fbops = &pmagbbfb_ops; |
277 | info->fix = pmagbbfb_fix; |
278 | info->var = pmagbbfb_defined; |
279 | info->flags = FBINFO_DEFAULT; |
280 | |
281 | /* Request the I/O MEM resource. */ |
282 | start = tdev->resource.start; |
283 | len = tdev->resource.end - start + 1; |
284 | if (!request_mem_region(start, len, dev_name(dev))) { |
285 | printk(KERN_ERR "%s: Cannot reserve FB region\n", |
286 | dev_name(dev)); |
287 | err = -EBUSY; |
288 | goto err_cmap; |
289 | } |
290 | |
291 | /* MMIO mapping setup. */ |
292 | info->fix.mmio_start = start; |
293 | par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len); |
294 | if (!par->mmio) { |
295 | printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev)); |
296 | err = -ENOMEM; |
297 | goto err_resource; |
298 | } |
299 | par->sfb = par->mmio + PMAGB_B_SFB; |
300 | par->dac = par->mmio + PMAGB_B_BT459; |
301 | |
302 | /* Frame buffer mapping setup. */ |
303 | info->fix.smem_start = start + PMAGB_B_FBMEM; |
304 | par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len); |
305 | if (!par->smem) { |
306 | printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev)); |
307 | err = -ENOMEM; |
308 | goto err_mmio_map; |
309 | } |
310 | vid_base = sfb_read(par, SFB_REG_VID_BASE); |
311 | info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000; |
312 | info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000; |
313 | |
314 | pmagbbfb_erase_cursor(info); |
315 | pmagbbfb_screen_setup(info); |
316 | pmagbbfb_osc_setup(info); |
317 | |
318 | err = register_framebuffer(info); |
319 | if (err < 0) { |
320 | printk(KERN_ERR "%s: Cannot register framebuffer\n", |
321 | dev_name(dev)); |
322 | goto err_smem_map; |
323 | } |
324 | |
325 | get_device(dev); |
326 | |
327 | snprintf(freq0, sizeof(freq0), "%u.%03uMHz", |
328 | par->osc0 / 1000, par->osc0 % 1000); |
329 | snprintf(freq1, sizeof(freq1), "%u.%03uMHz", |
330 | par->osc1 / 1000, par->osc1 % 1000); |
331 | |
332 | pr_info("fb%d: %s frame buffer device at %s\n", |
333 | info->node, info->fix.id, dev_name(dev)); |
334 | pr_info("fb%d: Osc0: %s, Osc1: %s, Osc%u selected\n", |
335 | info->node, freq0, par->osc1 ? freq1 : "disabled", |
336 | par->osc1 != 0); |
337 | |
338 | return 0; |
339 | |
340 | |
341 | err_smem_map: |
342 | iounmap(par->smem); |
343 | |
344 | err_mmio_map: |
345 | iounmap(par->mmio); |
346 | |
347 | err_resource: |
348 | release_mem_region(start, len); |
349 | |
350 | err_cmap: |
351 | fb_dealloc_cmap(&info->cmap); |
352 | |
353 | err_alloc: |
354 | framebuffer_release(info); |
355 | return err; |
356 | } |
357 | |
358 | static int __exit pmagbbfb_remove(struct device *dev) |
359 | { |
360 | struct tc_dev *tdev = to_tc_dev(dev); |
361 | struct fb_info *info = dev_get_drvdata(dev); |
362 | struct pmagbbfb_par *par = info->par; |
363 | resource_size_t start, len; |
364 | |
365 | put_device(dev); |
366 | unregister_framebuffer(info); |
367 | iounmap(par->smem); |
368 | iounmap(par->mmio); |
369 | start = tdev->resource.start; |
370 | len = tdev->resource.end - start + 1; |
371 | release_mem_region(start, len); |
372 | fb_dealloc_cmap(&info->cmap); |
373 | framebuffer_release(info); |
374 | return 0; |
375 | } |
376 | |
377 | |
378 | /* |
379 | * Initialize the framebuffer. |
380 | */ |
381 | static const struct tc_device_id pmagbbfb_tc_table[] = { |
382 | { "DEC ", "PMAGB-BA" }, |
383 | { } |
384 | }; |
385 | MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table); |
386 | |
387 | static struct tc_driver pmagbbfb_driver = { |
388 | .id_table = pmagbbfb_tc_table, |
389 | .driver = { |
390 | .name = "pmagbbfb", |
391 | .bus = &tc_bus_type, |
392 | .probe = pmagbbfb_probe, |
393 | .remove = __exit_p(pmagbbfb_remove), |
394 | }, |
395 | }; |
396 | |
397 | static int __init pmagbbfb_init(void) |
398 | { |
399 | #ifndef MODULE |
400 | if (fb_get_options("pmagbbfb", NULL)) |
401 | return -ENXIO; |
402 | #endif |
403 | return tc_register_driver(&pmagbbfb_driver); |
404 | } |
405 | |
406 | static void __exit pmagbbfb_exit(void) |
407 | { |
408 | tc_unregister_driver(&pmagbbfb_driver); |
409 | } |
410 | |
411 | |
412 | module_init(pmagbbfb_init); |
413 | module_exit(pmagbbfb_exit); |
414 | |
415 | MODULE_LICENSE("GPL"); |
416 |
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