1 /* $Id: cgthreefb.c,v 1.11 2001/09/19 00:04:33 davem Exp $
2 * cgthreefb.c: CGthree frame buffer driver
3 *
4 * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
5 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
6 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
7 */
8
9 #include <linux/module.h>
10 #include <linux/sched.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/string.h>
14 #include <linux/mm.h>
15 #include <linux/tty.h>
16 #include <linux/slab.h>
17 #include <linux/vmalloc.h>
18 #include <linux/delay.h>
19 #include <linux/interrupt.h>
20 #include <linux/fb.h>
21 #include <linux/init.h>
22 #include <linux/selection.h>
23
24 #include <video/sbusfb.h>
25 #include <asm/io.h>
26
27 #include <video/fbcon-cfb8.h>
28
29 /* Control Register Constants */
30 #define CG3_CR_ENABLE_INTS 0x80
31 #define CG3_CR_ENABLE_VIDEO 0x40
32 #define CG3_CR_ENABLE_TIMING 0x20
33 #define CG3_CR_ENABLE_CURCMP 0x10
34 #define CG3_CR_XTAL_MASK 0x0c
35 #define CG3_CR_DIVISOR_MASK 0x03
36
37 /* Status Register Constants */
38 #define CG3_SR_PENDING_INT 0x80
39 #define CG3_SR_RES_MASK 0x70
40 #define CG3_SR_1152_900_76_A 0x40
41 #define CG3_SR_1152_900_76_B 0x60
42 #define CG3_SR_ID_MASK 0x0f
43 #define CG3_SR_ID_COLOR 0x01
44 #define CG3_SR_ID_MONO 0x02
45 #define CG3_SR_ID_MONO_ECL 0x03
46
47 MODULE_LICENSE("GPL");
48
49 enum cg3_type {
50 CG3_AT_66HZ = 0,
51 CG3_AT_76HZ,
52 CG3_RDI
53 };
54
55 struct cg3_regs {
56 struct bt_regs cmap;
57 volatile u8 control;
58 volatile u8 status;
59 volatile u8 cursor_start;
60 volatile u8 cursor_end;
61 volatile u8 h_blank_start;
62 volatile u8 h_blank_end;
63 volatile u8 h_sync_start;
64 volatile u8 h_sync_end;
65 volatile u8 comp_sync_end;
66 volatile u8 v_blank_start_high;
67 volatile u8 v_blank_start_low;
68 volatile u8 v_blank_end;
69 volatile u8 v_sync_start;
70 volatile u8 v_sync_end;
71 volatile u8 xfer_holdoff_start;
72 volatile u8 xfer_holdoff_end;
73 };
74
75 /* Offset of interesting structures in the OBIO space */
76 #define CG3_REGS_OFFSET 0x400000UL
77 #define CG3_RAM_OFFSET 0x800000UL
78
79 static struct sbus_mmap_map cg3_mmap_map[] = {
80 { CG3_MMAP_OFFSET, CG3_RAM_OFFSET, SBUS_MMAP_FBSIZE(1) },
81 { 0, 0, 0 }
82 };
83
84 /* The cg3 palette is loaded with 4 color values at each time */
85 /* so you end up with: (rgb)(r), (gb)(rg), (b)(rgb), and so on */
86
87 #define D4M3(x) ((((x)>>2)<<1) + ((x)>>2)) /* (x/4)*3 */
88 #define D4M4(x) ((x)&~0x3) /* (x/4)*4 */
89
cg3_loadcmap(struct fb_info_sbusfb * fb,struct display * p,int index,int count)90 static void cg3_loadcmap (struct fb_info_sbusfb *fb, struct display *p, int index, int count)
91 {
92 struct bt_regs *bt = &fb->s.cg3.regs->cmap;
93 unsigned long flags;
94 u32 *i;
95 volatile u8 *regp;
96 int steps;
97
98 spin_lock_irqsave(&fb->lock, flags);
99
100 i = (((u32 *)fb->color_map) + D4M3(index));
101 steps = D4M3(index+count-1) - D4M3(index)+3;
102
103 regp = (volatile u8 *)&bt->addr;
104 sbus_writeb(D4M4(index), regp);
105 while (steps--) {
106 u32 val = *i++;
107 sbus_writel(val, &bt->color_map);
108 }
109
110 spin_unlock_irqrestore(&fb->lock, flags);
111 }
112
cg3_blank(struct fb_info_sbusfb * fb)113 static void cg3_blank (struct fb_info_sbusfb *fb)
114 {
115 unsigned long flags;
116 u8 tmp;
117
118 spin_lock_irqsave(&fb->lock, flags);
119 tmp = sbus_readb(&fb->s.cg3.regs->control);
120 tmp &= ~CG3_CR_ENABLE_VIDEO;
121 sbus_writeb(tmp, &fb->s.cg3.regs->control);
122 spin_unlock_irqrestore(&fb->lock, flags);
123 }
124
cg3_unblank(struct fb_info_sbusfb * fb)125 static void cg3_unblank (struct fb_info_sbusfb *fb)
126 {
127 unsigned long flags;
128 u8 tmp;
129
130 spin_lock_irqsave(&fb->lock, flags);
131 tmp = sbus_readb(&fb->s.cg3.regs->control);
132 tmp |= CG3_CR_ENABLE_VIDEO;
133 sbus_writeb(tmp, &fb->s.cg3.regs->control);
134 spin_unlock_irqrestore(&fb->lock, flags);
135 }
136
cg3_margins(struct fb_info_sbusfb * fb,struct display * p,int x_margin,int y_margin)137 static void cg3_margins (struct fb_info_sbusfb *fb, struct display *p,
138 int x_margin, int y_margin)
139 {
140 p->screen_base += (y_margin - fb->y_margin) *
141 p->line_length + (x_margin - fb->x_margin);
142 }
143
144 static u8 cg3regvals_66hz[] __initdata = { /* 1152 x 900, 66 Hz */
145 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14,
146 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24,
147 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,
148 0x10, 0x20, 0
149 };
150
151 static u8 cg3regvals_76hz[] __initdata = { /* 1152 x 900, 76 Hz */
152 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f,
153 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a,
154 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01,
155 0x10, 0x24, 0
156 };
157
158 static u8 cg3regvals_rdi[] __initdata = { /* 640 x 480, cgRDI */
159 0x14, 0x70, 0x15, 0x20, 0x16, 0x08, 0x17, 0x10,
160 0x18, 0x06, 0x19, 0x02, 0x1a, 0x31, 0x1b, 0x51,
161 0x1c, 0x06, 0x1d, 0x0c, 0x1e, 0xff, 0x1f, 0x01,
162 0x10, 0x22, 0
163 };
164
165 static u8 *cg3_regvals[] __initdata = {
166 cg3regvals_66hz, cg3regvals_76hz, cg3regvals_rdi
167 };
168
169 static u_char cg3_dacvals[] __initdata = {
170 4, 0xff, 5, 0x00, 6, 0x70, 7, 0x00, 0
171 };
172
173 static char idstring[60] __initdata = { 0 };
174
cgthreefb_init(struct fb_info_sbusfb * fb)175 char __init *cgthreefb_init(struct fb_info_sbusfb *fb)
176 {
177 struct fb_fix_screeninfo *fix = &fb->fix;
178 struct display *disp = &fb->disp;
179 struct fbtype *type = &fb->type;
180 struct sbus_dev *sdev = fb->sbdp;
181 unsigned long phys = sdev->reg_addrs[0].phys_addr;
182 int cgRDI = strstr(fb->sbdp->prom_name, "cgRDI") != NULL;
183
184 #ifndef FBCON_HAS_CFB8
185 return NULL;
186 #endif
187
188 if (!fb->s.cg3.regs) {
189 fb->s.cg3.regs = (struct cg3_regs *)
190 sbus_ioremap(&sdev->resource[0], CG3_REGS_OFFSET,
191 sizeof(struct cg3_regs), "cg3 regs");
192 if (cgRDI) {
193 char buffer[40];
194 char *p;
195 int ww, hh;
196
197 *buffer = 0;
198 prom_getstring (fb->prom_node, "params", buffer, sizeof(buffer));
199 if (*buffer) {
200 ww = simple_strtoul (buffer, &p, 10);
201 if (ww && *p == 'x') {
202 hh = simple_strtoul (p + 1, &p, 10);
203 if (hh && *p == '-') {
204 if (type->fb_width != ww || type->fb_height != hh) {
205 type->fb_width = ww;
206 type->fb_height = hh;
207 return SBUSFBINIT_SIZECHANGE;
208 }
209 }
210 }
211 }
212 }
213 }
214
215 strcpy(fb->info.modename, "CGthree");
216 strcpy(fix->id, "CGthree");
217 fix->line_length = fb->var.xres_virtual;
218 fix->accel = FB_ACCEL_SUN_CGTHREE;
219
220 disp->scrollmode = SCROLL_YREDRAW;
221 if (!disp->screen_base) {
222 disp->screen_base = (char *)
223 sbus_ioremap(&sdev->resource[0], CG3_RAM_OFFSET,
224 type->fb_size, "cg3 ram");
225 }
226 disp->screen_base += fix->line_length * fb->y_margin + fb->x_margin;
227 fb->dispsw = fbcon_cfb8;
228
229 fb->margins = cg3_margins;
230 fb->loadcmap = cg3_loadcmap;
231 fb->blank = cg3_blank;
232 fb->unblank = cg3_unblank;
233
234 fb->physbase = phys;
235 fb->mmap_map = cg3_mmap_map;
236
237 #ifdef __sparc_v9__
238 sprintf(idstring, "%s at %016lx", cgRDI ? "cgRDI" : "cgthree", phys);
239 #else
240 sprintf(idstring, "%s at %x.%08lx", cgRDI ? "cgRDI" : "cgthree", fb->iospace, phys);
241 #endif
242
243 if (!prom_getbool(fb->prom_node, "width")) {
244 /* Ugh, broken PROM didn't initialize us.
245 * Let's deal with this ourselves.
246 */
247 enum cg3_type type;
248 u8 *p;
249
250 if (cgRDI)
251 type = CG3_RDI;
252 else {
253 u8 status = sbus_readb(&fb->s.cg3.regs->status), mon;
254 if ((status & CG3_SR_ID_MASK) == CG3_SR_ID_COLOR) {
255 mon = status & CG3_SR_RES_MASK;
256 if (mon == CG3_SR_1152_900_76_A ||
257 mon == CG3_SR_1152_900_76_B)
258 type = CG3_AT_76HZ;
259 else
260 type = CG3_AT_66HZ;
261 } else {
262 prom_printf("cgthree: can't handle SR %02x\n",
263 status);
264 prom_halt();
265 return NULL; /* fool gcc. */
266 }
267 }
268
269 for (p = cg3_regvals[type]; *p; p += 2) {
270 u8 *regp = &((u8 *)fb->s.cg3.regs)[p[0]];
271 sbus_writeb(p[1], regp);
272 }
273 for (p = cg3_dacvals; *p; p += 2) {
274 volatile u8 *regp;
275
276 regp = (volatile u8 *)&fb->s.cg3.regs->cmap.addr;
277 sbus_writeb(p[0], regp);
278 regp = (volatile u8 *)&fb->s.cg3.regs->cmap.control;
279 sbus_writeb(p[1], regp);
280 }
281 }
282
283 return idstring;
284 }
285