g364fb.c

  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");