1 /* $Id: g364fb.c,v 1.3 1998/08/28 22:43:00 tsbogend Exp $
2 *
3 * linux/drivers/video/g364fb.c -- Mips Magnum frame buffer device
4 *
5 * (C) 1998 Thomas Bogendoerfer
6 *
7 * This driver is based on tgafb.c
8 *
9 * Copyright (C) 1997 Geert Uytterhoeven
10 * Copyright (C) 1995 Jay Estabrook
11 *
12 * This file is subject to the terms and conditions of the GNU General Public
13 * License. See the file COPYING in the main directory of this archive for
14 * more details.
15 */
16
17 #include <linux/module.h>
18 #include <linux/console.h>
19 #include <linux/kernel.h>
20 #include <linux/errno.h>
21 #include <linux/string.h>
22 #include <linux/mm.h>
23 #include <linux/slab.h>
24 #include <linux/vmalloc.h>
25 #include <linux/delay.h>
26 #include <linux/interrupt.h>
27 #include <linux/fb.h>
28 #include <linux/init.h>
29 #include <asm/io.h>
30 #include <asm/jazz.h>
31
32 /*
33 * Various defines for the G364
34 */
35 #define G364_MEM_BASE 0xe4400000
36 #define G364_PORT_BASE 0xe4000000
37 #define ID_REG 0xe4000000 /* Read only */
38 #define BOOT_REG 0xe4080000
39 #define TIMING_REG 0xe4080108 /* to 0x080170 - DON'T TOUCH! */
40 #define DISPLAY_REG 0xe4080118
41 #define VDISPLAY_REG 0xe4080150
42 #define MASK_REG 0xe4080200
43 #define CTLA_REG 0xe4080300
44 #define CURS_TOGGLE 0x800000
45 #define BIT_PER_PIX 0x700000 /* bits 22 to 20 of Control A */
46 #define DELAY_SAMPLE 0x080000
47 #define PORT_INTER 0x040000
48 #define PIX_PIPE_DEL 0x030000 /* bits 17 and 16 of Control A */
49 #define PIX_PIPE_DEL2 0x008000 /* same as above - don't ask me why */
50 #define TR_CYCLE_TOG 0x004000
51 #define VRAM_ADR_INC 0x003000 /* bits 13 and 12 of Control A */
52 #define BLANK_OFF 0x000800
53 #define FORCE_BLANK 0x000400
54 #define BLK_FUN_SWTCH 0x000200
55 #define BLANK_IO 0x000100
56 #define BLANK_LEVEL 0x000080
57 #define A_VID_FORM 0x000040
58 #define D_SYNC_FORM 0x000020
59 #define FRAME_FLY_PAT 0x000010
60 #define OP_MODE 0x000008
61 #define INTL_STAND 0x000004
62 #define SCRN_FORM 0x000002
63 #define ENABLE_VTG 0x000001
64 #define TOP_REG 0xe4080400
65 #define CURS_PAL_REG 0xe4080508 /* to 0x080518 */
66 #define CHKSUM_REG 0xe4080600 /* to 0x080610 - unused */
67 #define CURS_POS_REG 0xe4080638
68 #define CLR_PAL_REG 0xe4080800 /* to 0x080ff8 */
69 #define CURS_PAT_REG 0xe4081000 /* to 0x081ff8 */
70 #define MON_ID_REG 0xe4100000 /* unused */
71 #define RESET_REG 0xe4180000 /* Write only */
72
73 static struct fb_info fb_info;
74
75 static struct fb_fix_screeninfo fb_fix __initdata = {
76 .id = "G364 8plane",
77 .smem_start = 0x40000000, /* physical address */
78 .type = FB_TYPE_PACKED_PIXELS,
79 .visual = FB_VISUAL_PSEUDOCOLOR,
80 .ypanstep = 1,
81 .accel = FB_ACCEL_NONE,
82 };
83
84 static struct fb_var_screeninfo fb_var __initdata = {
85 .bits_per_pixel = 8,
86 .red = { 0, 8, 0 },
87 .green = { 0, 8, 0 },
88 .blue = { 0, 8, 0 },
89 .activate = FB_ACTIVATE_NOW,
90 .height = -1,
91 .width = -1,
92 .pixclock = 39722,
93 .left_margin = 40,
94 .right_margin = 24,
95 .upper_margin = 32,
96 .lower_margin = 11,
97 .hsync_len = 96,
98 .vsync_len = 2,
99 .vmode = FB_VMODE_NONINTERLACED,
100 };
101
102 /*
103 * Interface used by the world
104 */
105 int g364fb_init(void);
106
107 static int g364fb_pan_display(struct fb_var_screeninfo *var,
108 struct fb_info *info);
109 static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
110 u_int blue, u_int transp,
111 struct fb_info *info);
112 static int g364fb_cursor(struct fb_info *info, struct fb_cursor *cursor);
113 static int g364fb_blank(int blank, struct fb_info *info);
114
115 static struct fb_ops g364fb_ops = {
116 .owner = THIS_MODULE,
117 .fb_setcolreg = g364fb_setcolreg,
118 .fb_pan_display = g364fb_pan_display,
119 .fb_blank = g364fb_blank,
120 .fb_fillrect = cfb_fillrect,
121 .fb_copyarea = cfb_copyarea,
122 .fb_imageblit = cfb_imageblit,
123 .fb_cursor = g364fb_cursor,
124 };
125
126 int g364fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
127 {
128
129 switch (cursor->enable) {
130 case CM_ERASE:
131 *(unsigned int *) CTLA_REG |= CURS_TOGGLE;
132 break;
133
134 case CM_MOVE:
135 case CM_DRAW:
136 *(unsigned int *) CTLA_REG &= ~CURS_TOGGLE;
137 *(unsigned int *) CURS_POS_REG =
138 ((x * fontwidth(p)) << 12) | ((y * fontheight(p)) -
139 info->var.yoffset);
140 break;
141 }
142 return 0;
143 }
144
145 /*
146 * Pan or Wrap the Display
147 *
148 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
149 */
150 static int g364fb_pan_display(struct fb_var_screeninfo *var,
151 struct fb_info *info)
152 {
153 if (var->xoffset || var->yoffset + var->yres > var->yres_virtual)
154 return -EINVAL;
155
156 *(unsigned int *) TOP_REG = var->yoffset * var->xres;
157 return 0;
158 }
159
160 /*
161 * Blank the display.
162 */
163 static int g364fb_blank(int blank, struct fb_info *info)
164 {
165 if (blank)
166 *(unsigned int *) CTLA_REG |= FORCE_BLANK;
167 else
168 *(unsigned int *) CTLA_REG &= ~FORCE_BLANK;
169 return 0;
170 }
171
172 /*
173 * Set a single color register. Return != 0 for invalid regno.
174 */
175 static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
176 u_int blue, u_int transp, struct fb_info *info)
177 {
178 volatile unsigned int *ptr = (volatile unsigned int *) CLR_PAL_REG;
179
180 if (regno > 255)
181 return 1;
182
183 red >>= 8;
184 green >>= 8;
185 blue >>= 8;
186
187 ptr[regno << 1] = (red << 16) | (green << 8) | blue;
188
189 return 0;
190 }
191
192 /*
193 * Initialisation
194 */
195 int __init g364fb_init(void)
196 {
197 volatile unsigned int *pal_ptr =
198 (volatile unsigned int *) CLR_PAL_REG;
199 volatile unsigned int *curs_pal_ptr =
200 (volatile unsigned int *) CURS_PAL_REG;
201 int mem, i, j;
202
203 if (fb_get_options("g364fb", NULL))
204 return -ENODEV;
205
206 /* TBD: G364 detection */
207
208 /* get the resolution set by ARC console */
209 *(volatile unsigned int *) CTLA_REG &= ~ENABLE_VTG;
210 fb_var.xres =
211 (*((volatile unsigned int *) DISPLAY_REG) & 0x00ffffff) * 4;
212 fb_var.yres =
213 (*((volatile unsigned int *) VDISPLAY_REG) & 0x00ffffff) / 2;
214 *(volatile unsigned int *) CTLA_REG |= ENABLE_VTG;
215
216 /* setup cursor */
217 curs_pal_ptr[0] |= 0x00ffffff;
218 curs_pal_ptr[2] |= 0x00ffffff;
219 curs_pal_ptr[4] |= 0x00ffffff;
220
221 /*
222 * first set the whole cursor to transparent
223 */
224 for (i = 0; i < 512; i++)
225 *(unsigned short *) (CURS_PAT_REG + i * 8) = 0;
226
227 /*
228 * switch the last two lines to cursor palette 3
229 * we assume here, that FONTSIZE_X is 8
230 */
231 *(unsigned short *) (CURS_PAT_REG + 14 * 64) = 0xffff;
232 *(unsigned short *) (CURS_PAT_REG + 15 * 64) = 0xffff;
233 fb_var.xres_virtual = fbvar.xres;
234 fb_fix.line_length = (xres / 8) * fb_var.bits_per_pixel;
235 fb_fix.smem_start = 0x40000000; /* physical address */
236 /* get size of video memory; this is special for the JAZZ hardware */
237 mem = (r4030_read_reg32(JAZZ_R4030_CONFIG) >> 8) & 3;
238 fb_fix.smem_len = (1 << (mem * 2)) * 512 * 1024;
239 fb_var.yres_virtual = fb_fix.smem_len / fb_var.xres;
240
241 fb_info.fbops = &g364fb_ops;
242 fb_info.screen_base = (char *) G364_MEM_BASE; /* virtual kernel address */
243 fb_info.var = fb_var;
244 fb_info.fix = fb_fix;
245 fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
246
247 fb_alloc_cmap(&fb_info.cmap, 255, 0);
248
249 if (register_framebuffer(&fb_info) < 0)
250 return -EINVAL;
251 return 0;
252 }
253
254 module_init(g364fb_init);
255 MODULE_LICENSE("GPL");
256
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