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kbuild: document howto build external modules using several directories
[linux-2.6/verdex.git] / drivers / video / pmagb-b-fb.c
blob25148de5fe6795799999269bd3a92cb0991a0311
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 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/types.h>
29
30 #include <asm/bug.h>
31 #include <asm/io.h>
32 #include <asm/system.h>
33
34 #include <asm/dec/tc.h>
35
36 #include <video/pmagb-b-fb.h>
37
38
39 struct pmagbbfb_par {
40 struct fb_info *next;
41 volatile void __iomem *mmio;
42 volatile void __iomem *smem;
43 volatile u32 __iomem *sfb;
44 volatile u32 __iomem *dac;
45 unsigned int osc0;
46 unsigned int osc1;
47 int slot;
48 };
49
50
51 static struct fb_info *root_pmagbbfb_dev;
52
53 static struct fb_var_screeninfo pmagbbfb_defined __initdata = {
54 .bits_per_pixel = 8,
55 .red.length = 8,
56 .green.length = 8,
57 .blue.length = 8,
58 .activate = FB_ACTIVATE_NOW,
59 .height = -1,
60 .width = -1,
61 .accel_flags = FB_ACCEL_NONE,
62 .sync = FB_SYNC_ON_GREEN,
63 .vmode = FB_VMODE_NONINTERLACED,
64 };
65
66 static struct fb_fix_screeninfo pmagbbfb_fix __initdata = {
67 .id = "PMAGB-BA",
68 .smem_len = (2048 * 1024),
69 .type = FB_TYPE_PACKED_PIXELS,
70 .visual = FB_VISUAL_PSEUDOCOLOR,
71 .mmio_len = PMAGB_B_FBMEM,
72 };
73
74
75 static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v)
76 {
77 writel(v, par->sfb + reg / 4);
78 }
79
80 static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg)
81 {
82 return readl(par->sfb + reg / 4);
83 }
84
85 static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v)
86 {
87 writeb(v, par->dac + reg / 4);
88 }
89
90 static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg)
91 {
92 return readb(par->dac + reg / 4);
93 }
94
95 static inline void gp0_write(struct pmagbbfb_par *par, u32 v)
96 {
97 writel(v, par->mmio + PMAGB_B_GP0);
98 }
99
100
101 /*
102 * Set the palette.
103 */
104 static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red,
105 unsigned int green, unsigned int blue,
106 unsigned int transp, struct fb_info *info)
107 {
108 struct pmagbbfb_par *par = info->par;
109
110 BUG_ON(regno >= info->cmap.len);
111
112 red >>= 8; /* The cmap fields are 16 bits */
113 green >>= 8; /* wide, but the hardware colormap */
114 blue >>= 8; /* registers are only 8 bits wide */
115
116 mb();
117 dac_write(par, BT459_ADDR_LO, regno);
118 dac_write(par, BT459_ADDR_HI, 0x00);
119 wmb();
120 dac_write(par, BT459_CMAP, red);
121 wmb();
122 dac_write(par, BT459_CMAP, green);
123 wmb();
124 dac_write(par, BT459_CMAP, blue);
125
126 return 0;
127 }
128
129 static struct fb_ops pmagbbfb_ops = {
130 .owner = THIS_MODULE,
131 .fb_setcolreg = pmagbbfb_setcolreg,
132 .fb_fillrect = cfb_fillrect,
133 .fb_copyarea = cfb_copyarea,
134 .fb_imageblit = cfb_imageblit,
135 };
136
137
138 /*
139 * Turn the hardware cursor off.
140 */
141 static void __init pmagbbfb_erase_cursor(struct fb_info *info)
142 {
143 struct pmagbbfb_par *par = info->par;
144
145 mb();
146 dac_write(par, BT459_ADDR_LO, 0x00);
147 dac_write(par, BT459_ADDR_HI, 0x03);
148 wmb();
149 dac_write(par, BT459_DATA, 0x00);
150 }
151
152 /*
153 * Set up screen parameters.
154 */
155 static void __init pmagbbfb_screen_setup(struct fb_info *info)
156 {
157 struct pmagbbfb_par *par = info->par;
158
159 info->var.xres = ((sfb_read(par, SFB_REG_VID_HOR) >>
160 SFB_VID_HOR_PIX_SHIFT) & SFB_VID_HOR_PIX_MASK) * 4;
161 info->var.xres_virtual = info->var.xres;
162 info->var.yres = (sfb_read(par, SFB_REG_VID_VER) >>
163 SFB_VID_VER_SL_SHIFT) & SFB_VID_VER_SL_MASK;
164 info->var.yres_virtual = info->var.yres;
165 info->var.left_margin = ((sfb_read(par, SFB_REG_VID_HOR) >>
166 SFB_VID_HOR_BP_SHIFT) &
167 SFB_VID_HOR_BP_MASK) * 4;
168 info->var.right_margin = ((sfb_read(par, SFB_REG_VID_HOR) >>
169 SFB_VID_HOR_FP_SHIFT) &
170 SFB_VID_HOR_FP_MASK) * 4;
171 info->var.upper_margin = (sfb_read(par, SFB_REG_VID_VER) >>
172 SFB_VID_VER_BP_SHIFT) & SFB_VID_VER_BP_MASK;
173 info->var.lower_margin = (sfb_read(par, SFB_REG_VID_VER) >>
174 SFB_VID_VER_FP_SHIFT) & SFB_VID_VER_FP_MASK;
175 info->var.hsync_len = ((sfb_read(par, SFB_REG_VID_HOR) >>
176 SFB_VID_HOR_SYN_SHIFT) &
177 SFB_VID_HOR_SYN_MASK) * 4;
178 info->var.vsync_len = (sfb_read(par, SFB_REG_VID_VER) >>
179 SFB_VID_VER_SYN_SHIFT) & SFB_VID_VER_SYN_MASK;
180
181 info->fix.line_length = info->var.xres;
182 };
183
184 /*
185 * Determine oscillator configuration.
186 */
187 static void __init pmagbbfb_osc_setup(struct fb_info *info)
188 {
189 static unsigned int pmagbbfb_freqs[] __initdata = {
190 130808, 119843, 104000, 92980, 74367, 72800,
191 69197, 66000, 65000, 50350, 36000, 32000, 25175
192 };
193 struct pmagbbfb_par *par = info->par;
194 u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8;
195 u32 freq0, freq1, freqtc = get_tc_speed() / 250;
196 int i, j;
197
198 gp0_write(par, 0); /* select Osc0 */
199 for (j = 0; j < 16; j++) {
200 mb();
201 sfb_write(par, SFB_REG_TCCLK_COUNT, 0);
202 mb();
203 for (i = 0; i < 100; i++) { /* nominally max. 20.5us */
204 if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0)
205 break;
206 udelay(1);
207 }
208 count0 += sfb_read(par, SFB_REG_VIDCLK_COUNT);
209 }
210
211 gp0_write(par, 1); /* select Osc1 */
212 for (j = 0; j < 16; j++) {
213 mb();
214 sfb_write(par, SFB_REG_TCCLK_COUNT, 0);
215
216 for (i = 0; i < 100; i++) { /* nominally max. 20.5us */
217 if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0)
218 break;
219 udelay(1);
220 }
221 count1 += sfb_read(par, SFB_REG_VIDCLK_COUNT);
222 }
223
224 freq0 = (freqtc * count0 + counttc / 2) / counttc;
225 par->osc0 = freq0;
226 if (freq0 >= pmagbbfb_freqs[0] - (pmagbbfb_freqs[0] + 32) / 64 &&
227 freq0 <= pmagbbfb_freqs[0] + (pmagbbfb_freqs[0] + 32) / 64)
228 par->osc0 = pmagbbfb_freqs[0];
229
230 freq1 = (par->osc0 * count1 + count0 / 2) / count0;
231 par->osc1 = freq1;
232 for (i = 0; i < sizeof(pmagbbfb_freqs) / sizeof(*pmagbbfb_freqs); i++)
233 if (freq1 >= pmagbbfb_freqs[i] -
234 (pmagbbfb_freqs[i] + 128) / 256 &&
235 freq1 <= pmagbbfb_freqs[i] +
236 (pmagbbfb_freqs[i] + 128) / 256) {
237 par->osc1 = pmagbbfb_freqs[i];
238 break;
239 }
240
241 if (par->osc0 - par->osc1 <= (par->osc0 + par->osc1 + 256) / 512 ||
242 par->osc1 - par->osc0 <= (par->osc0 + par->osc1 + 256) / 512)
243 par->osc1 = 0;
244
245 gp0_write(par, par->osc1 != 0); /* reselect OscX */
246
247 info->var.pixclock = par->osc1 ?
248 (1000000000 + par->osc1 / 2) / par->osc1 :
249 (1000000000 + par->osc0 / 2) / par->osc0;
250 };
251
252
253 static int __init pmagbbfb_init_one(int slot)
254 {
255 char freq0[12], freq1[12];
256 struct fb_info *info;
257 struct pmagbbfb_par *par;
258 unsigned long base_addr;
259 u32 vid_base;
260
261 info = framebuffer_alloc(sizeof(struct pmagbbfb_par), NULL);
262 if (!info)
263 return -ENOMEM;
264
265 par = info->par;
266 par->slot = slot;
267 claim_tc_card(par->slot);
268
269 base_addr = get_tc_base_addr(par->slot);
270
271 par->next = root_pmagbbfb_dev;
272 root_pmagbbfb_dev = info;
273
274 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
275 goto err_alloc;
276
277 info->fbops = &pmagbbfb_ops;
278 info->fix = pmagbbfb_fix;
279 info->var = pmagbbfb_defined;
280 info->flags = FBINFO_DEFAULT;
281
282 /* MMIO mapping setup. */
283 info->fix.mmio_start = base_addr;
284 par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
285 if (!par->mmio)
286 goto err_cmap;
287 par->sfb = par->mmio + PMAGB_B_SFB;
288 par->dac = par->mmio + PMAGB_B_BT459;
289
290 /* Frame buffer mapping setup. */
291 info->fix.smem_start = base_addr + PMAGB_B_FBMEM;
292 par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
293 if (!par->smem)
294 goto err_mmio_map;
295 vid_base = sfb_read(par, SFB_REG_VID_BASE);
296 info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000;
297 info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000;
298
299 pmagbbfb_erase_cursor(info);
300 pmagbbfb_screen_setup(info);
301 pmagbbfb_osc_setup(info);
302
303 if (register_framebuffer(info) < 0)
304 goto err_smem_map;
305
306 snprintf(freq0, sizeof(freq0), "%u.%03uMHz",
307 par->osc0 / 1000, par->osc0 % 1000);
308 snprintf(freq1, sizeof(freq1), "%u.%03uMHz",
309 par->osc1 / 1000, par->osc1 % 1000);
310
311 pr_info("fb%d: %s frame buffer device in slot %d\n",
312 info->node, info->fix.id, par->slot);
313 pr_info("fb%d: Osc0: %s, Osc1: %s, Osc%u selected\n",
314 info->node, freq0, par->osc1 ? freq1 : "disabled",
315 par->osc1 != 0);
316
317 return 0;
318
319
320 err_smem_map:
321 iounmap(par->smem);
322
323 err_mmio_map:
324 iounmap(par->mmio);
325
326 err_cmap:
327 fb_dealloc_cmap(&info->cmap);
328
329 err_alloc:
330 root_pmagbbfb_dev = par->next;
331 release_tc_card(par->slot);
332 framebuffer_release(info);
333 return -ENXIO;
334 }
335
336 static void __exit pmagbbfb_exit_one(void)
337 {
338 struct fb_info *info = root_pmagbbfb_dev;
339 struct pmagbbfb_par *par = info->par;
340
341 unregister_framebuffer(info);
342 iounmap(par->smem);
343 iounmap(par->mmio);
344 fb_dealloc_cmap(&info->cmap);
345 root_pmagbbfb_dev = par->next;
346 release_tc_card(par->slot);
347 framebuffer_release(info);
348 }
349
350
351 /*
352 * Initialise the framebuffer.
353 */
354 static int __init pmagbbfb_init(void)
355 {
356 int count = 0;
357 int slot;
358
359 if (fb_get_options("pmagbbfb", NULL))
360 return -ENXIO;
361
362 while ((slot = search_tc_card("PMAGB-BA")) >= 0) {
363 if (pmagbbfb_init_one(slot) < 0)
364 break;
365 count++;
366 }
367 return (count > 0) ? 0 : -ENXIO;
368 }
369
370 static void __exit pmagbbfb_exit(void)
371 {
372 while (root_pmagbbfb_dev)
373 pmagbbfb_exit_one();
374 }
375
376
377 module_init(pmagbbfb_init);
378 module_exit(pmagbbfb_exit);
379
380 MODULE_LICENSE("GPL");
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