tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/io.h>
31#include <asm/system.h>
32
33#include <asm/dec/tc.h>
34
35#include <video/pmagb-b-fb.h>
36
37
38struct 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;
47};
48
49
50static struct fb_info *root_pmagbbfb_dev;
51
52static struct fb_var_screeninfo pmagbbfb_defined __initdata = {
53 .bits_per_pixel = 8,
54 .red.length = 8,
55 .green.length = 8,
56 .blue.length = 8,
57 .activate = FB_ACTIVATE_NOW,
58 .height = -1,
59 .width = -1,
60 .accel_flags = FB_ACCEL_NONE,
61 .sync = FB_SYNC_ON_GREEN,
62 .vmode = FB_VMODE_NONINTERLACED,
63};
64
65static struct fb_fix_screeninfo pmagbbfb_fix __initdata = {
66 .id = "PMAGB-BA",
67 .smem_len = (2048 * 1024),
68 .type = FB_TYPE_PACKED_PIXELS,
69 .visual = FB_VISUAL_PSEUDOCOLOR,
70 .mmio_len = PMAGB_B_FBMEM,
71};
72
73
74static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v)
75{
76 writel(v, par->sfb + reg / 4);
77}
78
79static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg)
80{
81 return readl(par->sfb + reg / 4);
82}
83
84static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v)
85{
86 writeb(v, par->dac + reg / 4);
87}
88
89static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg)
90{
91 return readb(par->dac + reg / 4);
92}
93
94static inline void gp0_write(struct pmagbbfb_par *par, u32 v)
95{
96 writel(v, par->mmio + PMAGB_B_GP0);
97}
98
99
100/*
101 * Set the palette.
102 */
103static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red,
104 unsigned int green, unsigned int blue,
105 unsigned int transp, struct fb_info *info)
106{
107 struct pmagbbfb_par *par = info->par;
108
109 BUG_ON(regno >= info->cmap.len);
110
111 red >>= 8; /* The cmap fields are 16 bits */
112 green >>= 8; /* wide, but the hardware colormap */
113 blue >>= 8; /* registers are only 8 bits wide */
114
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
125 return 0;
126}
127
128static 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,
134};
135
136
137/*
138 * Turn the hardware cursor off.
139 */
140static 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 */
154static 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 */
186static void __init pmagbbfb_osc_setup(struct fb_info *info)
187{
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;
231 for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++)
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
252static 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
276 info->fbops = &pmagbbfb_ops;
277 info->fix = pmagbbfb_fix;
278 info->var = pmagbbfb_defined;
279 info->flags = FBINFO_DEFAULT;
280
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);
301
302 if (register_framebuffer(info) < 0)
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
316 return 0;
317
318
319err_smem_map:
320 iounmap(par->smem);
321
322err_mmio_map:
323 iounmap(par->mmio);
324
325err_cmap:
326 fb_dealloc_cmap(&info->cmap);
327
328err_alloc:
329 root_pmagbbfb_dev = par->next;
330 release_tc_card(par->slot);
331 framebuffer_release(info);
332 return -ENXIO;
333}
334
335static 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}
348
349
350/*
351 * Initialise the framebuffer.
352 */
353static int __init pmagbbfb_init(void)
354{
355 int count = 0;
356 int slot;
357
358 if (fb_get_options("pmagbbfb", NULL))
359 return -ENXIO;
360
361 while ((slot = search_tc_card("PMAGB-BA")) >= 0) {
362 if (pmagbbfb_init_one(slot) < 0)
363 break;
364 count++;
365 }
366 return (count > 0) ? 0 : -ENXIO;
367}
368
369static void __exit pmagbbfb_exit(void)
370{
371 while (root_pmagbbfb_dev)
372 pmagbbfb_exit_one();
373}
374
375
376module_init(pmagbbfb_init);
377module_exit(pmagbbfb_exit);
378
379MODULE_LICENSE("GPL");