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