Commit | Line | Data |
---|---|---|
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. |
7901c799 | 14 | * Copyright (c) 2005 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> | |
28 | #include <linux/types.h> | |
29 | ||
7901c799 RB |
30 | #include <asm/io.h> |
31 | #include <asm/system.h> | |
32 | ||
1da177e4 | 33 | #include <asm/dec/tc.h> |
7901c799 | 34 | |
1da177e4 LT |
35 | #include <video/pmagb-b-fb.h> |
36 | ||
7901c799 RB |
37 | |
38 | struct pmagbbfb_par { | |
39 | struct fb_info *next; | |
40 | volatile void __iomem *mmio; | |
41 | volatile void __iomem *smem; | |
42 | volatile u32 __iomem *sfb; | |
43 | volatile u32 __iomem *dac; | |
44 | unsigned int osc0; | |
45 | unsigned int osc1; | |
46 | int slot; | |
1da177e4 LT |
47 | }; |
48 | ||
1da177e4 | 49 | |
7901c799 RB |
50 | static struct fb_info *root_pmagbbfb_dev; |
51 | ||
52 | static struct fb_var_screeninfo pmagbbfb_defined __initdata = { | |
1da177e4 LT |
53 | .bits_per_pixel = 8, |
54 | .red.length = 8, | |
55 | .green.length = 8, | |
56 | .blue.length = 8, | |
57 | .activate = FB_ACTIVATE_NOW, | |
7901c799 RB |
58 | .height = -1, |
59 | .width = -1, | |
1da177e4 | 60 | .accel_flags = FB_ACCEL_NONE, |
7901c799 | 61 | .sync = FB_SYNC_ON_GREEN, |
1da177e4 LT |
62 | .vmode = FB_VMODE_NONINTERLACED, |
63 | }; | |
64 | ||
7901c799 | 65 | static struct fb_fix_screeninfo pmagbbfb_fix __initdata = { |
1da177e4 | 66 | .id = "PMAGB-BA", |
7901c799 | 67 | .smem_len = (2048 * 1024), |
1da177e4 LT |
68 | .type = FB_TYPE_PACKED_PIXELS, |
69 | .visual = FB_VISUAL_PSEUDOCOLOR, | |
7901c799 RB |
70 | .mmio_len = PMAGB_B_FBMEM, |
71 | }; | |
72 | ||
73 | ||
74 | static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v) | |
75 | { | |
76 | writel(v, par->sfb + reg / 4); | |
1da177e4 LT |
77 | } |
78 | ||
7901c799 RB |
79 | static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg) |
80 | { | |
81 | return readl(par->sfb + reg / 4); | |
82 | } | |
83 | ||
84 | static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v) | |
1da177e4 | 85 | { |
7901c799 | 86 | writeb(v, par->dac + reg / 4); |
1da177e4 LT |
87 | } |
88 | ||
7901c799 RB |
89 | static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg) |
90 | { | |
91 | return readb(par->dac + reg / 4); | |
92 | } | |
93 | ||
94 | static inline void gp0_write(struct pmagbbfb_par *par, u32 v) | |
95 | { | |
96 | writel(v, par->mmio + PMAGB_B_GP0); | |
97 | } | |
98 | ||
99 | ||
1da177e4 | 100 | /* |
7901c799 | 101 | * Set the palette. |
1da177e4 | 102 | */ |
7901c799 RB |
103 | static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red, |
104 | unsigned int green, unsigned int blue, | |
105 | unsigned int transp, struct fb_info *info) | |
1da177e4 | 106 | { |
7901c799 RB |
107 | struct pmagbbfb_par *par = info->par; |
108 | ||
109 | BUG_ON(regno >= info->cmap.len); | |
1da177e4 LT |
110 | |
111 | red >>= 8; /* The cmap fields are 16 bits */ | |
7901c799 | 112 | green >>= 8; /* wide, but the hardware colormap */ |
1da177e4 LT |
113 | blue >>= 8; /* registers are only 8 bits wide */ |
114 | ||
7901c799 RB |
115 | mb(); |
116 | dac_write(par, BT459_ADDR_LO, regno); | |
117 | dac_write(par, BT459_ADDR_HI, 0x00); | |
118 | wmb(); | |
119 | dac_write(par, BT459_CMAP, red); | |
120 | wmb(); | |
121 | dac_write(par, BT459_CMAP, green); | |
122 | wmb(); | |
123 | dac_write(par, BT459_CMAP, blue); | |
124 | ||
1da177e4 LT |
125 | return 0; |
126 | } | |
127 | ||
128 | static struct fb_ops pmagbbfb_ops = { | |
129 | .owner = THIS_MODULE, | |
130 | .fb_setcolreg = pmagbbfb_setcolreg, | |
131 | .fb_fillrect = cfb_fillrect, | |
132 | .fb_copyarea = cfb_copyarea, | |
133 | .fb_imageblit = cfb_imageblit, | |
1da177e4 LT |
134 | }; |
135 | ||
7901c799 RB |
136 | |
137 | /* | |
138 | * Turn the hardware cursor off. | |
139 | */ | |
140 | static void __init pmagbbfb_erase_cursor(struct fb_info *info) | |
141 | { | |
142 | struct pmagbbfb_par *par = info->par; | |
143 | ||
144 | mb(); | |
145 | dac_write(par, BT459_ADDR_LO, 0x00); | |
146 | dac_write(par, BT459_ADDR_HI, 0x03); | |
147 | wmb(); | |
148 | dac_write(par, BT459_DATA, 0x00); | |
149 | } | |
150 | ||
151 | /* | |
152 | * Set up screen parameters. | |
153 | */ | |
154 | static void __init pmagbbfb_screen_setup(struct fb_info *info) | |
155 | { | |
156 | struct pmagbbfb_par *par = info->par; | |
157 | ||
158 | info->var.xres = ((sfb_read(par, SFB_REG_VID_HOR) >> | |
159 | SFB_VID_HOR_PIX_SHIFT) & SFB_VID_HOR_PIX_MASK) * 4; | |
160 | info->var.xres_virtual = info->var.xres; | |
161 | info->var.yres = (sfb_read(par, SFB_REG_VID_VER) >> | |
162 | SFB_VID_VER_SL_SHIFT) & SFB_VID_VER_SL_MASK; | |
163 | info->var.yres_virtual = info->var.yres; | |
164 | info->var.left_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> | |
165 | SFB_VID_HOR_BP_SHIFT) & | |
166 | SFB_VID_HOR_BP_MASK) * 4; | |
167 | info->var.right_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> | |
168 | SFB_VID_HOR_FP_SHIFT) & | |
169 | SFB_VID_HOR_FP_MASK) * 4; | |
170 | info->var.upper_margin = (sfb_read(par, SFB_REG_VID_VER) >> | |
171 | SFB_VID_VER_BP_SHIFT) & SFB_VID_VER_BP_MASK; | |
172 | info->var.lower_margin = (sfb_read(par, SFB_REG_VID_VER) >> | |
173 | SFB_VID_VER_FP_SHIFT) & SFB_VID_VER_FP_MASK; | |
174 | info->var.hsync_len = ((sfb_read(par, SFB_REG_VID_HOR) >> | |
175 | SFB_VID_HOR_SYN_SHIFT) & | |
176 | SFB_VID_HOR_SYN_MASK) * 4; | |
177 | info->var.vsync_len = (sfb_read(par, SFB_REG_VID_VER) >> | |
178 | SFB_VID_VER_SYN_SHIFT) & SFB_VID_VER_SYN_MASK; | |
179 | ||
180 | info->fix.line_length = info->var.xres; | |
181 | }; | |
182 | ||
183 | /* | |
184 | * Determine oscillator configuration. | |
185 | */ | |
186 | static void __init pmagbbfb_osc_setup(struct fb_info *info) | |
1da177e4 | 187 | { |
7901c799 RB |
188 | static unsigned int pmagbbfb_freqs[] __initdata = { |
189 | 130808, 119843, 104000, 92980, 74367, 72800, | |
190 | 69197, 66000, 65000, 50350, 36000, 32000, 25175 | |
191 | }; | |
192 | struct pmagbbfb_par *par = info->par; | |
193 | u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8; | |
194 | u32 freq0, freq1, freqtc = get_tc_speed() / 250; | |
195 | int i, j; | |
196 | ||
197 | gp0_write(par, 0); /* select Osc0 */ | |
198 | for (j = 0; j < 16; j++) { | |
199 | mb(); | |
200 | sfb_write(par, SFB_REG_TCCLK_COUNT, 0); | |
201 | mb(); | |
202 | for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ | |
203 | if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) | |
204 | break; | |
205 | udelay(1); | |
206 | } | |
207 | count0 += sfb_read(par, SFB_REG_VIDCLK_COUNT); | |
208 | } | |
209 | ||
210 | gp0_write(par, 1); /* select Osc1 */ | |
211 | for (j = 0; j < 16; j++) { | |
212 | mb(); | |
213 | sfb_write(par, SFB_REG_TCCLK_COUNT, 0); | |
214 | ||
215 | for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ | |
216 | if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) | |
217 | break; | |
218 | udelay(1); | |
219 | } | |
220 | count1 += sfb_read(par, SFB_REG_VIDCLK_COUNT); | |
221 | } | |
222 | ||
223 | freq0 = (freqtc * count0 + counttc / 2) / counttc; | |
224 | par->osc0 = freq0; | |
225 | if (freq0 >= pmagbbfb_freqs[0] - (pmagbbfb_freqs[0] + 32) / 64 && | |
226 | freq0 <= pmagbbfb_freqs[0] + (pmagbbfb_freqs[0] + 32) / 64) | |
227 | par->osc0 = pmagbbfb_freqs[0]; | |
228 | ||
229 | freq1 = (par->osc0 * count1 + count0 / 2) / count0; | |
230 | par->osc1 = freq1; | |
d1ae418e | 231 | for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++) |
7901c799 RB |
232 | if (freq1 >= pmagbbfb_freqs[i] - |
233 | (pmagbbfb_freqs[i] + 128) / 256 && | |
234 | freq1 <= pmagbbfb_freqs[i] + | |
235 | (pmagbbfb_freqs[i] + 128) / 256) { | |
236 | par->osc1 = pmagbbfb_freqs[i]; | |
237 | break; | |
238 | } | |
239 | ||
240 | if (par->osc0 - par->osc1 <= (par->osc0 + par->osc1 + 256) / 512 || | |
241 | par->osc1 - par->osc0 <= (par->osc0 + par->osc1 + 256) / 512) | |
242 | par->osc1 = 0; | |
243 | ||
244 | gp0_write(par, par->osc1 != 0); /* reselect OscX */ | |
245 | ||
246 | info->var.pixclock = par->osc1 ? | |
247 | (1000000000 + par->osc1 / 2) / par->osc1 : | |
248 | (1000000000 + par->osc0 / 2) / par->osc0; | |
249 | }; | |
250 | ||
251 | ||
252 | static int __init pmagbbfb_init_one(int slot) | |
253 | { | |
254 | char freq0[12], freq1[12]; | |
255 | struct fb_info *info; | |
256 | struct pmagbbfb_par *par; | |
257 | unsigned long base_addr; | |
258 | u32 vid_base; | |
259 | ||
260 | info = framebuffer_alloc(sizeof(struct pmagbbfb_par), NULL); | |
261 | if (!info) | |
262 | return -ENOMEM; | |
263 | ||
264 | par = info->par; | |
265 | par->slot = slot; | |
266 | claim_tc_card(par->slot); | |
267 | ||
268 | base_addr = get_tc_base_addr(par->slot); | |
269 | ||
270 | par->next = root_pmagbbfb_dev; | |
271 | root_pmagbbfb_dev = info; | |
272 | ||
273 | if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) | |
274 | goto err_alloc; | |
275 | ||
1da177e4 | 276 | info->fbops = &pmagbbfb_ops; |
1da177e4 | 277 | info->fix = pmagbbfb_fix; |
7901c799 | 278 | info->var = pmagbbfb_defined; |
1da177e4 LT |
279 | info->flags = FBINFO_DEFAULT; |
280 | ||
7901c799 RB |
281 | /* MMIO mapping setup. */ |
282 | info->fix.mmio_start = base_addr; | |
283 | par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len); | |
284 | if (!par->mmio) | |
285 | goto err_cmap; | |
286 | par->sfb = par->mmio + PMAGB_B_SFB; | |
287 | par->dac = par->mmio + PMAGB_B_BT459; | |
288 | ||
289 | /* Frame buffer mapping setup. */ | |
290 | info->fix.smem_start = base_addr + PMAGB_B_FBMEM; | |
291 | par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len); | |
292 | if (!par->smem) | |
293 | goto err_mmio_map; | |
294 | vid_base = sfb_read(par, SFB_REG_VID_BASE); | |
295 | info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000; | |
296 | info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000; | |
297 | ||
298 | pmagbbfb_erase_cursor(info); | |
299 | pmagbbfb_screen_setup(info); | |
300 | pmagbbfb_osc_setup(info); | |
1da177e4 LT |
301 | |
302 | if (register_framebuffer(info) < 0) | |
7901c799 RB |
303 | goto err_smem_map; |
304 | ||
305 | snprintf(freq0, sizeof(freq0), "%u.%03uMHz", | |
306 | par->osc0 / 1000, par->osc0 % 1000); | |
307 | snprintf(freq1, sizeof(freq1), "%u.%03uMHz", | |
308 | par->osc1 / 1000, par->osc1 % 1000); | |
309 | ||
310 | pr_info("fb%d: %s frame buffer device in slot %d\n", | |
311 | info->node, info->fix.id, par->slot); | |
312 | pr_info("fb%d: Osc0: %s, Osc1: %s, Osc%u selected\n", | |
313 | info->node, freq0, par->osc1 ? freq1 : "disabled", | |
314 | par->osc1 != 0); | |
315 | ||
1da177e4 | 316 | return 0; |
7901c799 RB |
317 | |
318 | ||
319 | err_smem_map: | |
320 | iounmap(par->smem); | |
321 | ||
322 | err_mmio_map: | |
323 | iounmap(par->mmio); | |
324 | ||
325 | err_cmap: | |
326 | fb_dealloc_cmap(&info->cmap); | |
327 | ||
328 | err_alloc: | |
329 | root_pmagbbfb_dev = par->next; | |
330 | release_tc_card(par->slot); | |
331 | framebuffer_release(info); | |
332 | return -ENXIO; | |
1da177e4 LT |
333 | } |
334 | ||
7901c799 RB |
335 | static void __exit pmagbbfb_exit_one(void) |
336 | { | |
337 | struct fb_info *info = root_pmagbbfb_dev; | |
338 | struct pmagbbfb_par *par = info->par; | |
339 | ||
340 | unregister_framebuffer(info); | |
341 | iounmap(par->smem); | |
342 | iounmap(par->mmio); | |
343 | fb_dealloc_cmap(&info->cmap); | |
344 | root_pmagbbfb_dev = par->next; | |
345 | release_tc_card(par->slot); | |
346 | framebuffer_release(info); | |
347 | } | |
1da177e4 | 348 | |
7901c799 RB |
349 | |
350 | /* | |
351 | * Initialise the framebuffer. | |
352 | */ | |
353 | static int __init pmagbbfb_init(void) | |
1da177e4 | 354 | { |
7901c799 RB |
355 | int count = 0; |
356 | int slot; | |
1da177e4 LT |
357 | |
358 | if (fb_get_options("pmagbbfb", NULL)) | |
7901c799 | 359 | return -ENXIO; |
1da177e4 | 360 | |
7901c799 RB |
361 | while ((slot = search_tc_card("PMAGB-BA")) >= 0) { |
362 | if (pmagbbfb_init_one(slot) < 0) | |
363 | break; | |
364 | count++; | |
1da177e4 | 365 | } |
7901c799 RB |
366 | return (count > 0) ? 0 : -ENXIO; |
367 | } | |
368 | ||
369 | static void __exit pmagbbfb_exit(void) | |
370 | { | |
371 | while (root_pmagbbfb_dev) | |
372 | pmagbbfb_exit_one(); | |
1da177e4 LT |
373 | } |
374 | ||
7901c799 | 375 | |
1da177e4 | 376 | module_init(pmagbbfb_init); |
7901c799 RB |
377 | module_exit(pmagbbfb_exit); |
378 | ||
1da177e4 | 379 | MODULE_LICENSE("GPL"); |