1#include <linux/kernel.h>
2#include <linux/errno.h>
3#include <linux/string.h>
4#include <linux/mm.h>
5#include <linux/delay.h>
6#include <linux/interrupt.h>
7#include <linux/platform_device.h>
8
9#include <asm/setup.h>
10#include <asm/irq.h>
11#include <asm/amigahw.h>
12#include <asm/amigaints.h>
13#include <asm/apollohw.h>
14#include <linux/fb.h>
15#include <linux/module.h>
16
17/* apollo video HW definitions */
18
19/*
20 * Control Registers.   IOBASE + $x
21 *
22 * Note: these are the Memory/IO BASE definitions for a mono card set to the
23 * alternate address
24 *
25 * Control 3A and 3B serve identical functions except that 3A
26 * deals with control 1 and 3b deals with Color LUT reg.
27 */
28
29#define AP_IOBASE       0x3b0	/* Base address of 1 plane board. */
30#define AP_STATUS       isaIO2mem(AP_IOBASE+0)	/* Status register.  Read */
31#define AP_WRITE_ENABLE isaIO2mem(AP_IOBASE+0)	/* Write Enable Register Write */
32#define AP_DEVICE_ID    isaIO2mem(AP_IOBASE+1)	/* Device ID Register. Read */
33#define AP_ROP_1        isaIO2mem(AP_IOBASE+2)	/* Raster Operation reg. Write Word */
34#define AP_DIAG_MEM_REQ isaIO2mem(AP_IOBASE+4)	/* Diagnostic Memory Request. Write Word */
35#define AP_CONTROL_0    isaIO2mem(AP_IOBASE+8)	/* Control Register 0.  Read/Write */
36#define AP_CONTROL_1    isaIO2mem(AP_IOBASE+0xa)	/* Control Register 1.  Read/Write */
37#define AP_CONTROL_3A   isaIO2mem(AP_IOBASE+0xe)	/* Control Register 3a. Read/Write */
38#define AP_CONTROL_2    isaIO2mem(AP_IOBASE+0xc)	/* Control Register 2. Read/Write */
39
40
41#define FRAME_BUFFER_START 0x0FA0000
42#define FRAME_BUFFER_LEN 0x40000
43
44/* CREG 0 */
45#define VECTOR_MODE 0x40	/* 010x.xxxx */
46#define DBLT_MODE   0x80	/* 100x.xxxx */
47#define NORMAL_MODE 0xE0	/* 111x.xxxx */
48#define SHIFT_BITS  0x1F	/* xxx1.1111 */
49	/* other bits are Shift value */
50
51/* CREG 1 */
52#define AD_BLT      0x80	/* 1xxx.xxxx */
53#define NORMAL      0x80 /* 1xxx.xxxx */	/* What is happening here ?? */
54#define INVERSE     0x00 /* 0xxx.xxxx */	/* Clearing this reverses the screen */
55#define PIX_BLT     0x00	/* 0xxx.xxxx */
56
57#define AD_HIBIT        0x40	/* xIxx.xxxx */
58
59#define ROP_EN          0x10	/* xxx1.xxxx */
60#define DST_EQ_SRC      0x00	/* xxx0.xxxx */
61#define nRESET_SYNC     0x08	/* xxxx.1xxx */
62#define SYNC_ENAB       0x02	/* xxxx.xx1x */
63
64#define BLANK_DISP      0x00	/* xxxx.xxx0 */
65#define ENAB_DISP       0x01	/* xxxx.xxx1 */
66
67#define NORM_CREG1      (nRESET_SYNC | SYNC_ENAB | ENAB_DISP)	/* no reset sync */
68
69/* CREG 2 */
70
71/*
72 * Following 3 defines are common to 1, 4 and 8 plane.
73 */
74
75#define S_DATA_1s   0x00 /* 00xx.xxxx */	/* set source to all 1's -- vector drawing */
76#define S_DATA_PIX  0x40 /* 01xx.xxxx */	/* takes source from ls-bits and replicates over 16 bits */
77#define S_DATA_PLN  0xC0 /* 11xx.xxxx */	/* normal, each data access =16-bits in
78						   one plane of image mem */
79
80/* CREG 3A/CREG 3B */
81#       define RESET_CREG 0x80	/* 1000.0000 */
82
83/* ROP REG  -  all one nibble */
84/*      ********* NOTE : this is used r0,r1,r2,r3 *********** */
85#define ROP(r2,r3,r0,r1) ( (U_SHORT)((r0)|((r1)<<4)|((r2)<<8)|((r3)<<12)) )
86#define DEST_ZERO               0x0
87#define SRC_AND_DEST    0x1
88#define SRC_AND_nDEST   0x2
89#define SRC                             0x3
90#define nSRC_AND_DEST   0x4
91#define DEST                    0x5
92#define SRC_XOR_DEST    0x6
93#define SRC_OR_DEST             0x7
94#define SRC_NOR_DEST    0x8
95#define SRC_XNOR_DEST   0x9
96#define nDEST                   0xA
97#define SRC_OR_nDEST    0xB
98#define nSRC                    0xC
99#define nSRC_OR_DEST    0xD
100#define SRC_NAND_DEST   0xE
101#define DEST_ONE                0xF
102
103#define SWAP(A) ((A>>8) | ((A&0xff) <<8))
104
105/* frame buffer operations */
106
107static int dnfb_blank(int blank, struct fb_info *info);
108static void dnfb_copyarea(struct fb_info *info, const struct fb_copyarea *area);
109
110static struct fb_ops dn_fb_ops = {
111	.owner		= THIS_MODULE,
112	.fb_blank	= dnfb_blank,
113	.fb_fillrect	= cfb_fillrect,
114	.fb_copyarea	= dnfb_copyarea,
115	.fb_imageblit	= cfb_imageblit,
116};
117
118struct fb_var_screeninfo dnfb_var = {
119	.xres		= 1280,
120	.yres		= 1024,
121	.xres_virtual	= 2048,
122	.yres_virtual	= 1024,
123	.bits_per_pixel	= 1,
124	.height		= -1,
125	.width		= -1,
126	.vmode		= FB_VMODE_NONINTERLACED,
127};
128
129static struct fb_fix_screeninfo dnfb_fix = {
130	.id		= "Apollo Mono",
131	.smem_start	= (FRAME_BUFFER_START + IO_BASE),
132	.smem_len	= FRAME_BUFFER_LEN,
133	.type		= FB_TYPE_PACKED_PIXELS,
134	.visual		= FB_VISUAL_MONO10,
135	.line_length	= 256,
136};
137
138static int dnfb_blank(int blank, struct fb_info *info)
139{
140	if (blank)
141		out_8(AP_CONTROL_3A, 0x0);
142	else
143		out_8(AP_CONTROL_3A, 0x1);
144	return 0;
145}
146
147static
148void dnfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
149{
150
151	int incr, y_delta, pre_read = 0, x_end, x_word_count;
152	uint start_mask, end_mask, dest;
153	ushort *src, dummy;
154	short i, j;
155
156	incr = (area->dy <= area->sy) ? 1 : -1;
157
158	src = (ushort *)(info->screen_base + area->sy * info->fix.line_length +
159			(area->sx >> 4));
160	dest = area->dy * (info->fix.line_length >> 1) + (area->dx >> 4);
161
162	if (incr > 0) {
163		y_delta = (info->fix.line_length * 8) - area->sx - area->width;
164		x_end = area->dx + area->width - 1;
165		x_word_count = (x_end >> 4) - (area->dx >> 4) + 1;
166		start_mask = 0xffff0000 >> (area->dx & 0xf);
167		end_mask = 0x7ffff >> (x_end & 0xf);
168		out_8(AP_CONTROL_0,
169		     (((area->dx & 0xf) - (area->sx & 0xf)) % 16) | (0x4 << 5));
170		if ((area->dx & 0xf) < (area->sx & 0xf))
171			pre_read = 1;
172	} else {
173		y_delta = -((info->fix.line_length * 8) - area->sx - area->width);
174		x_end = area->dx - area->width + 1;
175		x_word_count = (area->dx >> 4) - (x_end >> 4) + 1;
176		start_mask = 0x7ffff >> (area->dx & 0xf);
177		end_mask = 0xffff0000 >> (x_end & 0xf);
178		out_8(AP_CONTROL_0,
179		     ((-((area->sx & 0xf) - (area->dx & 0xf))) % 16) |
180		     (0x4 << 5));
181		if ((area->dx & 0xf) > (area->sx & 0xf))
182			pre_read = 1;
183	}
184
185	for (i = 0; i < area->height; i++) {
186
187		out_8(AP_CONTROL_3A, 0xc | (dest >> 16));
188
189		if (pre_read) {
190			dummy = *src;
191			src += incr;
192		}
193
194		if (x_word_count) {
195			out_8(AP_WRITE_ENABLE, start_mask);
196			*src = dest;
197			src += incr;
198			dest += incr;
199			out_8(AP_WRITE_ENABLE, 0);
200
201			for (j = 1; j < (x_word_count - 1); j++) {
202				*src = dest;
203				src += incr;
204				dest += incr;
205			}
206
207			out_8(AP_WRITE_ENABLE, start_mask);
208			*src = dest;
209			dest += incr;
210			src += incr;
211		} else {
212			out_8(AP_WRITE_ENABLE, start_mask | end_mask);
213			*src = dest;
214			dest += incr;
215			src += incr;
216		}
217		src += (y_delta / 16);
218		dest += (y_delta / 16);
219	}
220	out_8(AP_CONTROL_0, NORMAL_MODE);
221}
222
223/*
224 * Initialization
225 */
226
227static int dnfb_probe(struct platform_device *dev)
228{
229	struct fb_info *info;
230	int err = 0;
231
232	info = framebuffer_alloc(0, &dev->dev);
233	if (!info)
234		return -ENOMEM;
235
236	info->fbops = &dn_fb_ops;
237	info->fix = dnfb_fix;
238	info->var = dnfb_var;
239	info->var.red.length = 1;
240	info->var.red.offset = 0;
241	info->var.green = info->var.blue = info->var.red;
242	info->screen_base = (u_char *) info->fix.smem_start;
243
244	err = fb_alloc_cmap(&info->cmap, 2, 0);
245	if (err < 0) {
246		framebuffer_release(info);
247		return err;
248	}
249
250	err = register_framebuffer(info);
251	if (err < 0) {
252		fb_dealloc_cmap(&info->cmap);
253		framebuffer_release(info);
254		return err;
255	}
256	platform_set_drvdata(dev, info);
257
258	/* now we have registered we can safely setup the hardware */
259	out_8(AP_CONTROL_3A, RESET_CREG);
260	out_be16(AP_WRITE_ENABLE, 0x0);
261	out_8(AP_CONTROL_0, NORMAL_MODE);
262	out_8(AP_CONTROL_1, (AD_BLT | DST_EQ_SRC | NORM_CREG1));
263	out_8(AP_CONTROL_2, S_DATA_PLN);
264	out_be16(AP_ROP_1, SWAP(0x3));
265
266	printk("apollo frame buffer alive and kicking !\n");
267	return err;
268}
269
270static struct platform_driver dnfb_driver = {
271	.probe	= dnfb_probe,
272	.driver	= {
273		.name	= "dnfb",
274	},
275};
276
277static struct platform_device dnfb_device = {
278	.name	= "dnfb",
279};
280
281int __init dnfb_init(void)
282{
283	int ret;
284
285	if (!MACH_IS_APOLLO)
286		return -ENODEV;
287
288	if (fb_get_options("dnfb", NULL))
289		return -ENODEV;
290
291	ret = platform_driver_register(&dnfb_driver);
292
293	if (!ret) {
294		ret = platform_device_register(&dnfb_device);
295		if (ret)
296			platform_driver_unregister(&dnfb_driver);
297	}
298	return ret;
299}
300
301module_init(dnfb_init);
302
303MODULE_LICENSE("GPL");
304