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 
72 static struct fb_info fb_info;
73 
74 static 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 
83 static 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  */
104 int g364fb_init(void);
105 
106 static int g364fb_pan_display(struct fb_var_screeninfo *var,
107 			      struct fb_info *info);
108 static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
109 			    u_int blue, u_int transp,
110 			    struct fb_info *info);
111 static int g364fb_blank(int blank, struct fb_info *info);
112 
113 static const struct fb_ops g364fb_ops = {
114 	.owner		= THIS_MODULE,
115 	.fb_setcolreg	= g364fb_setcolreg,
116 	.fb_pan_display	= g364fb_pan_display,
117 	.fb_blank	= g364fb_blank,
118 	.fb_fillrect	= cfb_fillrect,
119 	.fb_copyarea	= cfb_copyarea,
120 	.fb_imageblit	= cfb_imageblit,
121 };
122 
123 /*
124  *  Pan or Wrap the Display
125  *
126  *  This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
127  */
g364fb_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)128 static int g364fb_pan_display(struct fb_var_screeninfo *var,
129 			      struct fb_info *info)
130 {
131 	if (var->xoffset ||
132 	    var->yoffset + info->var.yres > info->var.yres_virtual)
133 		return -EINVAL;
134 
135 	*(unsigned int *) TOP_REG = var->yoffset * info->var.xres;
136 	return 0;
137 }
138 
139 /*
140  *  Blank the display.
141  */
g364fb_blank(int blank,struct fb_info * info)142 static int g364fb_blank(int blank, struct fb_info *info)
143 {
144 	if (blank)
145 		*(unsigned int *) CTLA_REG |= FORCE_BLANK;
146 	else
147 		*(unsigned int *) CTLA_REG &= ~FORCE_BLANK;
148 	return 0;
149 }
150 
151 /*
152  *  Set a single color register. Return != 0 for invalid regno.
153  */
g364fb_setcolreg(u_int regno,u_int red,u_int green,u_int blue,u_int transp,struct fb_info * info)154 static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
155 			    u_int blue, u_int transp, struct fb_info *info)
156 {
157 	volatile unsigned int *ptr = (volatile unsigned int *) CLR_PAL_REG;
158 
159 	if (regno > 255)
160 		return 1;
161 
162 	red >>= 8;
163 	green >>= 8;
164 	blue >>= 8;
165 
166 	ptr[regno << 1] = (red << 16) | (green << 8) | blue;
167 
168 	return 0;
169 }
170 
171 /*
172  *  Initialisation
173  */
g364fb_init(void)174 int __init g364fb_init(void)
175 {
176 	volatile unsigned int *curs_pal_ptr =
177 	    (volatile unsigned int *) CURS_PAL_REG;
178 	int mem, i;
179 
180 	if (fb_get_options("g364fb", NULL))
181 		return -ENODEV;
182 
183 	/* TBD: G364 detection */
184 
185 	/* get the resolution set by ARC console */
186 	*(volatile unsigned int *) CTLA_REG &= ~ENABLE_VTG;
187 	fb_var.xres =
188 	    (*((volatile unsigned int *) DISPLAY_REG) & 0x00ffffff) * 4;
189 	fb_var.yres =
190 	    (*((volatile unsigned int *) VDISPLAY_REG) & 0x00ffffff) / 2;
191 	*(volatile unsigned int *) CTLA_REG |= ENABLE_VTG;
192 
193 	/* setup cursor */
194 	curs_pal_ptr[0] |= 0x00ffffff;
195 	curs_pal_ptr[2] |= 0x00ffffff;
196 	curs_pal_ptr[4] |= 0x00ffffff;
197 
198 	/*
199 	 * first set the whole cursor to transparent
200 	 */
201 	for (i = 0; i < 512; i++)
202 		*(unsigned short *) (CURS_PAT_REG + i * 8) = 0;
203 
204 	/*
205 	 * switch the last two lines to cursor palette 3
206 	 * we assume here, that FONTSIZE_X is 8
207 	 */
208 	*(unsigned short *) (CURS_PAT_REG + 14 * 64) = 0xffff;
209 	*(unsigned short *) (CURS_PAT_REG + 15 * 64) = 0xffff;
210 	fb_var.xres_virtual = fb_var.xres;
211 	fb_fix.line_length = fb_var.xres_virtual * fb_var.bits_per_pixel / 8;
212 	fb_fix.smem_start = 0x40000000;	/* physical address */
213 	/* get size of video memory; this is special for the JAZZ hardware */
214 	mem = (r4030_read_reg32(JAZZ_R4030_CONFIG) >> 8) & 3;
215 	fb_fix.smem_len = (1 << (mem * 2)) * 512 * 1024;
216 	fb_var.yres_virtual = fb_fix.smem_len / fb_var.xres;
217 
218 	fb_info.fbops = &g364fb_ops;
219 	fb_info.screen_base = (char *) G364_MEM_BASE;	/* virtual kernel address */
220 	fb_info.var = fb_var;
221 	fb_info.fix = fb_fix;
222 	fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
223 
224 	fb_alloc_cmap(&fb_info.cmap, 255, 0);
225 
226 	if (register_framebuffer(&fb_info) < 0)
227 		return -EINVAL;
228 	return 0;
229 }
230 
231 module_init(g364fb_init);
232 MODULE_LICENSE("GPL");
233