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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* $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/sched.h>
20#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/string.h>
23#include <linux/mm.h>
24#include <linux/tty.h>
25#include <linux/slab.h>
26#include <linux/vmalloc.h>
27#include <linux/delay.h>
28#include <linux/interrupt.h>
29#include <linux/fb.h>
30#include <linux/init.h>
31#include <linux/pci.h>
32#include <asm/io.h>
33#include <asm/jazz.h>
34
35/*
36 * Various defines for the G364
37 */
38#define G364_MEM_BASE 0xe4400000
39#define G364_PORT_BASE 0xe4000000
40#define ID_REG 0xe4000000 /* Read only */
41#define BOOT_REG 0xe4080000
42#define TIMING_REG 0xe4080108 /* to 0x080170 - DON'T TOUCH! */
43#define DISPLAY_REG 0xe4080118
44#define VDISPLAY_REG 0xe4080150
45#define MASK_REG 0xe4080200
46#define CTLA_REG 0xe4080300
47#define CURS_TOGGLE 0x800000
48#define BIT_PER_PIX 0x700000 /* bits 22 to 20 of Control A */
49#define DELAY_SAMPLE 0x080000
50#define PORT_INTER 0x040000
51#define PIX_PIPE_DEL 0x030000 /* bits 17 and 16 of Control A */
52#define PIX_PIPE_DEL2 0x008000 /* same as above - don't ask me why */
53#define TR_CYCLE_TOG 0x004000
54#define VRAM_ADR_INC 0x003000 /* bits 13 and 12 of Control A */
55#define BLANK_OFF 0x000800
56#define FORCE_BLANK 0x000400
57#define BLK_FUN_SWTCH 0x000200
58#define BLANK_IO 0x000100
59#define BLANK_LEVEL 0x000080
60#define A_VID_FORM 0x000040
61#define D_SYNC_FORM 0x000020
62#define FRAME_FLY_PAT 0x000010
63#define OP_MODE 0x000008
64#define INTL_STAND 0x000004
65#define SCRN_FORM 0x000002
66#define ENABLE_VTG 0x000001
67#define TOP_REG 0xe4080400
68#define CURS_PAL_REG 0xe4080508 /* to 0x080518 */
69#define CHKSUM_REG 0xe4080600 /* to 0x080610 - unused */
70#define CURS_POS_REG 0xe4080638
71#define CLR_PAL_REG 0xe4080800 /* to 0x080ff8 */
72#define CURS_PAT_REG 0xe4081000 /* to 0x081ff8 */
73#define MON_ID_REG 0xe4100000 /* unused */
74#define RESET_REG 0xe4180000 /* Write only */
75
76static struct fb_info fb_info;
77
78static struct fb_fix_screeninfo fb_fix __initdata = {
79 .id = "G364 8plane",
80 .smem_start = 0x40000000, /* physical address */
81 .type = FB_TYPE_PACKED_PIXELS,
82 .visual = FB_VISUAL_PSEUDOCOLOR,
83 .ypanstep = 1,
84 .accel = FB_ACCEL_NONE,
85};
86
87static struct fb_var_screeninfo fb_var __initdata = {
88 .bits_per_pixel = 8,
89 .red = { 0, 8, 0 },
90 .green = { 0, 8, 0 },
91 .blue = { 0, 8, 0 },
92 .activate = FB_ACTIVATE_NOW,
93 .height = -1,
94 .width = -1,
95 .pixclock = 39722,
96 .left_margin = 40,
97 .right_margin = 24,
98 .upper_margin = 32,
99 .lower_margin = 11,
100 .hsync_len = 96,
101 .vsync_len = 2,
102 .vmode = FB_VMODE_NONINTERLACED,
103};
104
105/*
106 * Interface used by the world
107 */
108int g364fb_init(void);
109
110static int g364fb_pan_display(struct fb_var_screeninfo *var,
111 struct fb_info *info);
112static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
113 u_int blue, u_int transp,
114 struct fb_info *info);
115static int g364fb_cursor(struct fb_info *info, struct fb_cursor *cursor);
116static int g364fb_blank(int blank, struct fb_info *info);
117
118static struct fb_ops g364fb_ops = {
119 .owner = THIS_MODULE,
120 .fb_setcolreg = g364fb_setcolreg,
121 .fb_pan_display = g364fb_pan_display,
122 .fb_blank = g364fb_blank,
123 .fb_fillrect = cfb_fillrect,
124 .fb_copyarea = cfb_copyarea,
125 .fb_imageblit = cfb_imageblit,
126 .fb_cursor = g364fb_cursor,
127};
128
129int g364fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
130{
131
132 switch (cursor->enable) {
133 case CM_ERASE:
134 *(unsigned int *) CTLA_REG |= CURS_TOGGLE;
135 break;
136
137 case CM_MOVE:
138 case CM_DRAW:
139 *(unsigned int *) CTLA_REG &= ~CURS_TOGGLE;
140 *(unsigned int *) CURS_POS_REG =
141 ((x * fontwidth(p)) << 12) | ((y * fontheight(p)) -
142 info->var.yoffset);
143 break;
144 }
145 return 0;
146}
147
148/*
149 * Pan or Wrap the Display
150 *
151 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
152 */
153static int g364fb_pan_display(struct fb_var_screeninfo *var,
154 struct fb_info *info)
155{
156 if (var->xoffset || var->yoffset + var->yres > var->yres_virtual)
157 return -EINVAL;
158
159 *(unsigned int *) TOP_REG = var->yoffset * var->xres;
160 return 0;
161}
162
163/*
164 * Blank the display.
165 */
166static int g364fb_blank(int blank, struct fb_info *info)
167{
168 if (blank)
169 *(unsigned int *) CTLA_REG |= FORCE_BLANK;
170 else
171 *(unsigned int *) CTLA_REG &= ~FORCE_BLANK;
172 return 0;
173}
174
175/*
176 * Set a single color register. Return != 0 for invalid regno.
177 */
178static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
179 u_int blue, u_int transp, struct fb_info *info)
180{
181 volatile unsigned int *ptr = (volatile unsigned int *) CLR_PAL_REG;
182
183 if (regno > 255)
184 return 1;
185
186 red >>= 8;
187 green >>= 8;
188 blue >>= 8;
189
190 ptr[regno << 1] = (red << 16) | (green << 8) | blue;
191
192 return 0;
193}
194
195/*
196 * Initialisation
197 */
198int __init g364fb_init(void)
199{
200 volatile unsigned int *pal_ptr =
201 (volatile unsigned int *) CLR_PAL_REG;
202 volatile unsigned int *curs_pal_ptr =
203 (volatile unsigned int *) CURS_PAL_REG;
204 int mem, i, j;
205
206 if (fb_get_options("g364fb", NULL))
207 return -ENODEV;
208
209 /* TBD: G364 detection */
210
211 /* get the resolution set by ARC console */
212 *(volatile unsigned int *) CTLA_REG &= ~ENABLE_VTG;
213 fb_var.xres =
214 (*((volatile unsigned int *) DISPLAY_REG) & 0x00ffffff) * 4;
215 fb_var.yres =
216 (*((volatile unsigned int *) VDISPLAY_REG) & 0x00ffffff) / 2;
217 *(volatile unsigned int *) CTLA_REG |= ENABLE_VTG;
218
219 /* setup cursor */
220 curs_pal_ptr[0] |= 0x00ffffff;
221 curs_pal_ptr[2] |= 0x00ffffff;
222 curs_pal_ptr[4] |= 0x00ffffff;
223
224 /*
225 * first set the whole cursor to transparent
226 */
227 for (i = 0; i < 512; i++)
228 *(unsigned short *) (CURS_PAT_REG + i * 8) = 0;
229
230 /*
231 * switch the last two lines to cursor palette 3
232 * we assume here, that FONTSIZE_X is 8
233 */
234 *(unsigned short *) (CURS_PAT_REG + 14 * 64) = 0xffff;
235 *(unsigned short *) (CURS_PAT_REG + 15 * 64) = 0xffff;
236 fb_var.xres_virtual = fbvar.xres;
237 fb_fix.line_length = (xres / 8) * fb_var.bits_per_pixel;
238 fb_fix.smem_start = 0x40000000; /* physical address */
239 /* get size of video memory; this is special for the JAZZ hardware */
240 mem = (r4030_read_reg32(JAZZ_R4030_CONFIG) >> 8) & 3;
241 fb_fix.smem_len = (1 << (mem * 2)) * 512 * 1024;
242 fb_var.yres_virtual = fb_fix.smem_len / fb_var.xres;
243
244 fb_info.fbops = &g364fb_ops;
245 fb_info.screen_base = (char *) G364_MEM_BASE; /* virtual kernel address */
246 fb_info.var = fb_var;
247 fb_info.fix = fb_fix;
248 fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
249
250 fb_alloc_cmap(&fb_info.cmap, 255, 0);
251
252 if (register_framebuffer(&fb_info) < 0)
253 return -EINVAL;
254 return 0;
255}
256
257module_init(g364fb_init);
258MODULE_LICENSE("GPL");