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Commit | Line | Data |
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1da177e4 | 1 | /* |
7901c799 | 2 | * linux/drivers/video/pmagb-b-fb.c |
1da177e4 | 3 | * |
7901c799 RB |
4 | * PMAGB-B TURBOchannel Smart Frame Buffer (SFB) card support, |
5 | * derived from: | |
1da177e4 LT |
6 | * "HP300 Topcat framebuffer support (derived from macfb of all things) |
7 | * Phil Blundell <philb@gnu.org> 1998", the original code can be | |
7901c799 | 8 | * found in the file hpfb.c in the same directory. |
1da177e4 | 9 | * |
7901c799 RB |
10 | * DECstation related code Copyright (C) 1999, 2000, 2001 by |
11 | * Michael Engel <engel@unix-ag.org>, | |
12 | * Karsten Merker <merker@linuxtag.org> and | |
1da177e4 | 13 | * Harald Koerfgen. |
9084b005 | 14 | * Copyright (c) 2005, 2006 Maciej W. Rozycki |
1da177e4 | 15 | * |
7901c799 RB |
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. | |
1da177e4 LT |
19 | */ |
20 | ||
7901c799 | 21 | #include <linux/compiler.h> |
1da177e4 | 22 | #include <linux/delay.h> |
7901c799 | 23 | #include <linux/errno.h> |
1da177e4 | 24 | #include <linux/fb.h> |
7901c799 RB |
25 | #include <linux/init.h> |
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
9084b005 | 28 | #include <linux/tc.h> |
7901c799 RB |
29 | #include <linux/types.h> |
30 | ||
7901c799 RB |
31 | #include <asm/io.h> |
32 | #include <asm/system.h> | |
33 | ||
1da177e4 LT |
34 | #include <video/pmagb-b-fb.h> |
35 | ||
7901c799 RB |
36 | |
37 | struct pmagbbfb_par { | |
7901c799 RB |
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; | |
1da177e4 LT |
45 | }; |
46 | ||
1da177e4 | 47 | |
7901c799 | 48 | static struct fb_var_screeninfo pmagbbfb_defined __initdata = { |
1da177e4 LT |
49 | .bits_per_pixel = 8, |
50 | .red.length = 8, | |
51 | .green.length = 8, | |
52 | .blue.length = 8, | |
53 | .activate = FB_ACTIVATE_NOW, | |
7901c799 RB |
54 | .height = -1, |
55 | .width = -1, | |
1da177e4 | 56 | .accel_flags = FB_ACCEL_NONE, |
7901c799 | 57 | .sync = FB_SYNC_ON_GREEN, |
1da177e4 LT |
58 | .vmode = FB_VMODE_NONINTERLACED, |
59 | }; | |
60 | ||
7901c799 | 61 | static struct fb_fix_screeninfo pmagbbfb_fix __initdata = { |
1da177e4 | 62 | .id = "PMAGB-BA", |
7901c799 | 63 | .smem_len = (2048 * 1024), |
1da177e4 LT |
64 | .type = FB_TYPE_PACKED_PIXELS, |
65 | .visual = FB_VISUAL_PSEUDOCOLOR, | |
7901c799 RB |
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); | |
1da177e4 LT |
73 | } |
74 | ||
7901c799 RB |
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) | |
1da177e4 | 81 | { |
7901c799 | 82 | writeb(v, par->dac + reg / 4); |
1da177e4 LT |
83 | } |
84 | ||
7901c799 RB |
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 | ||
1da177e4 | 96 | /* |
7901c799 | 97 | * Set the palette. |
1da177e4 | 98 | */ |
7901c799 RB |
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) | |
1da177e4 | 102 | { |
7901c799 RB |
103 | struct pmagbbfb_par *par = info->par; |
104 | ||
105 | BUG_ON(regno >= info->cmap.len); | |
1da177e4 LT |
106 | |
107 | red >>= 8; /* The cmap fields are 16 bits */ | |
7901c799 | 108 | green >>= 8; /* wide, but the hardware colormap */ |
1da177e4 LT |
109 | blue >>= 8; /* registers are only 8 bits wide */ |
110 | ||
7901c799 RB |
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 | ||
1da177e4 LT |
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, | |
1da177e4 LT |
130 | }; |
131 | ||
7901c799 RB |
132 | |
133 | /* | |
134 | * Turn the hardware cursor off. | |
135 | */ | |
136 | static void __init 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 __init 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 __init pmagbbfb_osc_setup(struct fb_info *info) | |
1da177e4 | 183 | { |
7901c799 | 184 | static unsigned int pmagbbfb_freqs[] __initdata = { |
572c04b2 | 185 | 130808, 119843, 104000, 92980, 74370, 72800, |
7901c799 RB |
186 | 69197, 66000, 65000, 50350, 36000, 32000, 25175 |
187 | }; | |
188 | struct pmagbbfb_par *par = info->par; | |
9084b005 | 189 | struct tc_bus *tbus = to_tc_dev(info->device)->bus; |
7901c799 | 190 | u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8; |
9084b005 | 191 | u32 freq0, freq1, freqtc = tc_get_speed(tbus) / 250; |
7901c799 RB |
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; | |
d1ae418e | 228 | for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++) |
7901c799 RB |
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 | ||
9084b005 | 249 | static int __init pmagbbfb_probe(struct device *dev) |
7901c799 | 250 | { |
9084b005 MR |
251 | struct tc_dev *tdev = to_tc_dev(dev); |
252 | resource_size_t start, len; | |
7901c799 RB |
253 | struct fb_info *info; |
254 | struct pmagbbfb_par *par; | |
9084b005 | 255 | char freq0[12], freq1[12]; |
7901c799 | 256 | u32 vid_base; |
840bc9b0 | 257 | int err; |
7901c799 | 258 | |
9084b005 | 259 | info = framebuffer_alloc(sizeof(struct pmagbbfb_par), dev); |
840bc9b0 | 260 | if (!info) { |
7ad33e74 | 261 | printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev)); |
7901c799 | 262 | return -ENOMEM; |
840bc9b0 | 263 | } |
7901c799 RB |
264 | |
265 | par = info->par; | |
9084b005 | 266 | dev_set_drvdata(dev, info); |
7901c799 | 267 | |
840bc9b0 MR |
268 | if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { |
269 | printk(KERN_ERR "%s: Cannot allocate color map\n", | |
7ad33e74 | 270 | dev_name(dev)); |
840bc9b0 | 271 | err = -ENOMEM; |
7901c799 | 272 | goto err_alloc; |
840bc9b0 | 273 | } |
7901c799 | 274 | |
1da177e4 | 275 | info->fbops = &pmagbbfb_ops; |
1da177e4 | 276 | info->fix = pmagbbfb_fix; |
7901c799 | 277 | info->var = pmagbbfb_defined; |
1da177e4 LT |
278 | info->flags = FBINFO_DEFAULT; |
279 | ||
9084b005 MR |
280 | /* Request the I/O MEM resource. */ |
281 | start = tdev->resource.start; | |
282 | len = tdev->resource.end - start + 1; | |
7ad33e74 KS |
283 | if (!request_mem_region(start, len, dev_name(dev))) { |
284 | printk(KERN_ERR "%s: Cannot reserve FB region\n", | |
285 | dev_name(dev)); | |
840bc9b0 | 286 | err = -EBUSY; |
9084b005 | 287 | goto err_cmap; |
840bc9b0 | 288 | } |
9084b005 | 289 | |
7901c799 | 290 | /* MMIO mapping setup. */ |
9084b005 | 291 | info->fix.mmio_start = start; |
7901c799 | 292 | par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len); |
840bc9b0 | 293 | if (!par->mmio) { |
7ad33e74 | 294 | printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev)); |
840bc9b0 | 295 | err = -ENOMEM; |
9084b005 | 296 | goto err_resource; |
840bc9b0 | 297 | } |
7901c799 RB |
298 | par->sfb = par->mmio + PMAGB_B_SFB; |
299 | par->dac = par->mmio + PMAGB_B_BT459; | |
300 | ||
301 | /* Frame buffer mapping setup. */ | |
9084b005 | 302 | info->fix.smem_start = start + PMAGB_B_FBMEM; |
7901c799 | 303 | par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len); |
840bc9b0 | 304 | if (!par->smem) { |
7ad33e74 | 305 | printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev)); |
840bc9b0 | 306 | err = -ENOMEM; |
7901c799 | 307 | goto err_mmio_map; |
840bc9b0 | 308 | } |
7901c799 RB |
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); | |
1da177e4 | 316 | |
840bc9b0 MR |
317 | err = register_framebuffer(info); |
318 | if (err < 0) { | |
319 | printk(KERN_ERR "%s: Cannot register framebuffer\n", | |
7ad33e74 | 320 | dev_name(dev)); |
7901c799 | 321 | goto err_smem_map; |
840bc9b0 | 322 | } |
7901c799 | 323 | |
9084b005 MR |
324 | get_device(dev); |
325 | ||
7901c799 RB |
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 | ||
9084b005 | 331 | pr_info("fb%d: %s frame buffer device at %s\n", |
7ad33e74 | 332 | info->node, info->fix.id, dev_name(dev)); |
7901c799 RB |
333 | pr_info("fb%d: Osc0: %s, Osc1: %s, Osc%u selected\n", |
334 | info->node, freq0, par->osc1 ? freq1 : "disabled", | |
335 | par->osc1 != 0); | |
336 | ||
1da177e4 | 337 | return 0; |
7901c799 RB |
338 | |
339 | ||
340 | err_smem_map: | |
341 | iounmap(par->smem); | |
342 | ||
343 | err_mmio_map: | |
344 | iounmap(par->mmio); | |
345 | ||
9084b005 MR |
346 | err_resource: |
347 | release_mem_region(start, len); | |
348 | ||
7901c799 RB |
349 | err_cmap: |
350 | fb_dealloc_cmap(&info->cmap); | |
351 | ||
352 | err_alloc: | |
7901c799 | 353 | framebuffer_release(info); |
840bc9b0 | 354 | return err; |
1da177e4 LT |
355 | } |
356 | ||
9084b005 | 357 | static int __exit pmagbbfb_remove(struct device *dev) |
7901c799 | 358 | { |
9084b005 MR |
359 | struct tc_dev *tdev = to_tc_dev(dev); |
360 | struct fb_info *info = dev_get_drvdata(dev); | |
7901c799 | 361 | struct pmagbbfb_par *par = info->par; |
9084b005 | 362 | resource_size_t start, len; |
7901c799 | 363 | |
9084b005 | 364 | put_device(dev); |
7901c799 RB |
365 | unregister_framebuffer(info); |
366 | iounmap(par->smem); | |
367 | iounmap(par->mmio); | |
9084b005 MR |
368 | start = tdev->resource.start; |
369 | len = tdev->resource.end - start + 1; | |
370 | release_mem_region(start, len); | |
7901c799 | 371 | fb_dealloc_cmap(&info->cmap); |
7901c799 | 372 | framebuffer_release(info); |
9084b005 | 373 | return 0; |
7901c799 | 374 | } |
1da177e4 | 375 | |
7901c799 RB |
376 | |
377 | /* | |
9084b005 | 378 | * Initialize the framebuffer. |
7901c799 | 379 | */ |
9084b005 MR |
380 | static const struct tc_device_id pmagbbfb_tc_table[] = { |
381 | { "DEC ", "PMAGB-BA" }, | |
382 | { } | |
383 | }; | |
384 | MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table); | |
385 | ||
386 | static struct tc_driver pmagbbfb_driver = { | |
387 | .id_table = pmagbbfb_tc_table, | |
388 | .driver = { | |
389 | .name = "pmagbbfb", | |
390 | .bus = &tc_bus_type, | |
391 | .probe = pmagbbfb_probe, | |
392 | .remove = __exit_p(pmagbbfb_remove), | |
393 | }, | |
394 | }; | |
395 | ||
7901c799 | 396 | static int __init pmagbbfb_init(void) |
1da177e4 | 397 | { |
9084b005 | 398 | #ifndef MODULE |
1da177e4 | 399 | if (fb_get_options("pmagbbfb", NULL)) |
7901c799 | 400 | return -ENXIO; |
9084b005 MR |
401 | #endif |
402 | return tc_register_driver(&pmagbbfb_driver); | |
7901c799 RB |
403 | } |
404 | ||
405 | static void __exit pmagbbfb_exit(void) | |
406 | { | |
9084b005 | 407 | tc_unregister_driver(&pmagbbfb_driver); |
1da177e4 LT |
408 | } |
409 | ||
7901c799 | 410 | |
1da177e4 | 411 | module_init(pmagbbfb_init); |
7901c799 RB |
412 | module_exit(pmagbbfb_exit); |
413 | ||
1da177e4 | 414 | MODULE_LICENSE("GPL"); |