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/drivers/video/g364fb.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 254 lines | 178 code | 30 blank | 46 comment | 8 complexity | b1339268c0ac515bc4a4d4bbfa3648f2 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  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_cursor(struct fb_info *info, struct fb_cursor *cursor);
112static int g364fb_blank(int blank, struct fb_info *info);
113
114static struct fb_ops g364fb_ops = {
115	.owner		= THIS_MODULE,
116	.fb_setcolreg	= g364fb_setcolreg,
117	.fb_pan_display	= g364fb_pan_display,
118	.fb_blank	= g364fb_blank,
119	.fb_fillrect	= cfb_fillrect,
120	.fb_copyarea	= cfb_copyarea,
121	.fb_imageblit	= cfb_imageblit,
122	.fb_cursor	= g364fb_cursor,
123};
124
125int g364fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
126{
127	
128	switch (cursor->enable) {
129	case CM_ERASE:
130		*(unsigned int *) CTLA_REG |= CURS_TOGGLE;
131		break;
132
133	case CM_MOVE:
134	case CM_DRAW:
135		*(unsigned int *) CTLA_REG &= ~CURS_TOGGLE;
136		*(unsigned int *) CURS_POS_REG =
137		    ((x * fontwidth(p)) << 12) | ((y * fontheight(p)) -
138						  info->var.yoffset);
139		break;
140	}
141	return 0;
142}
143
144/*
145 *  Pan or Wrap the Display
146 *
147 *  This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
148 */
149static int g364fb_pan_display(struct fb_var_screeninfo *var, 
150			      struct fb_info *info)
151{
152	if (var->xoffset || var->yoffset + var->yres > var->yres_virtual)
153		return -EINVAL;
154
155	*(unsigned int *) TOP_REG = var->yoffset * var->xres;
156	return 0;
157}
158
159/*
160 *  Blank the display.
161 */
162static int g364fb_blank(int blank, struct fb_info *info)
163{
164	if (blank)
165		*(unsigned int *) CTLA_REG |= FORCE_BLANK;
166	else
167		*(unsigned int *) CTLA_REG &= ~FORCE_BLANK;
168	return 0;
169}
170
171/*
172 *  Set a single color register. Return != 0 for invalid regno.
173 */
174static int g364fb_setcolreg(u_int regno, u_int red, u_int green,
175			    u_int blue, u_int transp, struct fb_info *info)
176{
177	volatile unsigned int *ptr = (volatile unsigned int *) CLR_PAL_REG;
178
179	if (regno > 255)
180		return 1;
181
182	red >>= 8;
183	green >>= 8;
184	blue >>= 8;
185
186	ptr[regno << 1] = (red << 16) | (green << 8) | blue;
187
188	return 0;
189}
190
191/*
192 *  Initialisation
193 */
194int __init g364fb_init(void)
195{
196	volatile unsigned int *pal_ptr =
197	    (volatile unsigned int *) CLR_PAL_REG;
198	volatile unsigned int *curs_pal_ptr =
199	    (volatile unsigned int *) CURS_PAL_REG;
200	int mem, i, j;
201
202	if (fb_get_options("g364fb", NULL))
203		return -ENODEV;
204
205	/* TBD: G364 detection */
206
207	/* get the resolution set by ARC console */
208	*(volatile unsigned int *) CTLA_REG &= ~ENABLE_VTG;
209	fb_var.xres =
210	    (*((volatile unsigned int *) DISPLAY_REG) & 0x00ffffff) * 4;
211	fb_var.yres =
212	    (*((volatile unsigned int *) VDISPLAY_REG) & 0x00ffffff) / 2;
213	*(volatile unsigned int *) CTLA_REG |= ENABLE_VTG;
214
215	/* setup cursor */
216	curs_pal_ptr[0] |= 0x00ffffff;
217	curs_pal_ptr[2] |= 0x00ffffff;
218	curs_pal_ptr[4] |= 0x00ffffff;
219
220	/*
221	 * first set the whole cursor to transparent
222	 */
223	for (i = 0; i < 512; i++)
224		*(unsigned short *) (CURS_PAT_REG + i * 8) = 0;
225
226	/*
227	 * switch the last two lines to cursor palette 3
228	 * we assume here, that FONTSIZE_X is 8
229	 */
230	*(unsigned short *) (CURS_PAT_REG + 14 * 64) = 0xffff;
231	*(unsigned short *) (CURS_PAT_REG + 15 * 64) = 0xffff;
232	fb_var.xres_virtual = fbvar.xres;
233	fb_fix.line_length = (xres / 8) * fb_var.bits_per_pixel;
234	fb_fix.smem_start = 0x40000000;	/* physical address */
235	/* get size of video memory; this is special for the JAZZ hardware */
236	mem = (r4030_read_reg32(JAZZ_R4030_CONFIG) >> 8) & 3;
237	fb_fix.smem_len = (1 << (mem * 2)) * 512 * 1024;
238	fb_var.yres_virtual = fb_fix.smem_len / fb_var.xres;
239
240	fb_info.fbops = &g364fb_ops;
241	fb_info.screen_base = (char *) G364_MEM_BASE;	/* virtual kernel address */
242	fb_info.var = fb_var;
243	fb_info.fix = fb_fix;
244	fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
245
246	fb_alloc_cmap(&fb_info.cmap, 255, 0);
247
248	if (register_framebuffer(&fb_info) < 0)
249		return -EINVAL;
250	return 0;
251}
252
253module_init(g364fb_init);
254MODULE_LICENSE("GPL");