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1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/kernel.h>
3#include <linux/errno.h>
4#include <linux/string.h>
5#include <linux/mm.h>
6#include <linux/delay.h>
7#include <linux/interrupt.h>
8#include <linux/platform_device.h>
9
10#include <asm/setup.h>
11#include <asm/irq.h>
12#include <asm/amigahw.h>
13#include <asm/amigaints.h>
14#include <asm/apollohw.h>
15#include <linux/fb.h>
16#include <linux/module.h>
17
18/* apollo video HW definitions */
19
20/*
21 * Control Registers. IOBASE + $x
22 *
23 * Note: these are the Memory/IO BASE definitions for a mono card set to the
24 * alternate address
25 *
26 * Control 3A and 3B serve identical functions except that 3A
27 * deals with control 1 and 3b deals with Color LUT reg.
28 */
29
30#define AP_IOBASE 0x3b0 /* Base address of 1 plane board. */
31#define AP_STATUS isaIO2mem(AP_IOBASE+0) /* Status register. Read */
32#define AP_WRITE_ENABLE isaIO2mem(AP_IOBASE+0) /* Write Enable Register Write */
33#define AP_DEVICE_ID isaIO2mem(AP_IOBASE+1) /* Device ID Register. Read */
34#define AP_ROP_1 isaIO2mem(AP_IOBASE+2) /* Raster Operation reg. Write Word */
35#define AP_DIAG_MEM_REQ isaIO2mem(AP_IOBASE+4) /* Diagnostic Memory Request. Write Word */
36#define AP_CONTROL_0 isaIO2mem(AP_IOBASE+8) /* Control Register 0. Read/Write */
37#define AP_CONTROL_1 isaIO2mem(AP_IOBASE+0xa) /* Control Register 1. Read/Write */
38#define AP_CONTROL_3A isaIO2mem(AP_IOBASE+0xe) /* Control Register 3a. Read/Write */
39#define AP_CONTROL_2 isaIO2mem(AP_IOBASE+0xc) /* Control Register 2. Read/Write */
40
41
42#define FRAME_BUFFER_START 0x0FA0000
43#define FRAME_BUFFER_LEN 0x40000
44
45/* CREG 0 */
46#define VECTOR_MODE 0x40 /* 010x.xxxx */
47#define DBLT_MODE 0x80 /* 100x.xxxx */
48#define NORMAL_MODE 0xE0 /* 111x.xxxx */
49#define SHIFT_BITS 0x1F /* xxx1.1111 */
50 /* other bits are Shift value */
51
52/* CREG 1 */
53#define AD_BLT 0x80 /* 1xxx.xxxx */
54#define NORMAL 0x80 /* 1xxx.xxxx */ /* What is happening here ?? */
55#define INVERSE 0x00 /* 0xxx.xxxx */ /* Clearing this reverses the screen */
56#define PIX_BLT 0x00 /* 0xxx.xxxx */
57
58#define AD_HIBIT 0x40 /* xIxx.xxxx */
59
60#define ROP_EN 0x10 /* xxx1.xxxx */
61#define DST_EQ_SRC 0x00 /* xxx0.xxxx */
62#define nRESET_SYNC 0x08 /* xxxx.1xxx */
63#define SYNC_ENAB 0x02 /* xxxx.xx1x */
64
65#define BLANK_DISP 0x00 /* xxxx.xxx0 */
66#define ENAB_DISP 0x01 /* xxxx.xxx1 */
67
68#define NORM_CREG1 (nRESET_SYNC | SYNC_ENAB | ENAB_DISP) /* no reset sync */
69
70/* CREG 2 */
71
72/*
73 * Following 3 defines are common to 1, 4 and 8 plane.
74 */
75
76#define S_DATA_1s 0x00 /* 00xx.xxxx */ /* set source to all 1's -- vector drawing */
77#define S_DATA_PIX 0x40 /* 01xx.xxxx */ /* takes source from ls-bits and replicates over 16 bits */
78#define S_DATA_PLN 0xC0 /* 11xx.xxxx */ /* normal, each data access =16-bits in
79 one plane of image mem */
80
81/* CREG 3A/CREG 3B */
82# define RESET_CREG 0x80 /* 1000.0000 */
83
84/* ROP REG - all one nibble */
85/* ********* NOTE : this is used r0,r1,r2,r3 *********** */
86#define ROP(r2,r3,r0,r1) ( (U_SHORT)((r0)|((r1)<<4)|((r2)<<8)|((r3)<<12)) )
87#define DEST_ZERO 0x0
88#define SRC_AND_DEST 0x1
89#define SRC_AND_nDEST 0x2
90#define SRC 0x3
91#define nSRC_AND_DEST 0x4
92#define DEST 0x5
93#define SRC_XOR_DEST 0x6
94#define SRC_OR_DEST 0x7
95#define SRC_NOR_DEST 0x8
96#define SRC_XNOR_DEST 0x9
97#define nDEST 0xA
98#define SRC_OR_nDEST 0xB
99#define nSRC 0xC
100#define nSRC_OR_DEST 0xD
101#define SRC_NAND_DEST 0xE
102#define DEST_ONE 0xF
103
104#define SWAP(A) ((A>>8) | ((A&0xff) <<8))
105
106/* frame buffer operations */
107
108static int dnfb_blank(int blank, struct fb_info *info);
109static void dnfb_copyarea(struct fb_info *info, const struct fb_copyarea *area);
110
111static const struct fb_ops dn_fb_ops = {
112 .owner = THIS_MODULE,
113 __FB_DEFAULT_IOMEM_OPS_RDWR,
114 .fb_blank = dnfb_blank,
115 .fb_fillrect = cfb_fillrect,
116 .fb_copyarea = dnfb_copyarea,
117 .fb_imageblit = cfb_imageblit,
118 __FB_DEFAULT_IOMEM_OPS_MMAP,
119};
120
121static const struct fb_var_screeninfo dnfb_var = {
122 .xres = 1280,
123 .yres = 1024,
124 .xres_virtual = 2048,
125 .yres_virtual = 1024,
126 .bits_per_pixel = 1,
127 .height = -1,
128 .width = -1,
129 .vmode = FB_VMODE_NONINTERLACED,
130};
131
132static const struct fb_fix_screeninfo dnfb_fix = {
133 .id = "Apollo Mono",
134 .smem_start = (FRAME_BUFFER_START + IO_BASE),
135 .smem_len = FRAME_BUFFER_LEN,
136 .type = FB_TYPE_PACKED_PIXELS,
137 .visual = FB_VISUAL_MONO10,
138 .line_length = 256,
139};
140
141static int dnfb_blank(int blank, struct fb_info *info)
142{
143 if (blank)
144 out_8(AP_CONTROL_3A, 0x0);
145 else
146 out_8(AP_CONTROL_3A, 0x1);
147 return 0;
148}
149
150static
151void dnfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
152{
153
154 int incr, y_delta, pre_read = 0, x_end, x_word_count;
155 uint start_mask, end_mask, dest;
156 ushort *src, dummy;
157 short i, j;
158
159 incr = (area->dy <= area->sy) ? 1 : -1;
160
161 src = (ushort *)(info->screen_base + area->sy * info->fix.line_length +
162 (area->sx >> 4));
163 dest = area->dy * (info->fix.line_length >> 1) + (area->dx >> 4);
164
165 if (incr > 0) {
166 y_delta = (info->fix.line_length * 8) - area->sx - area->width;
167 x_end = area->dx + area->width - 1;
168 x_word_count = (x_end >> 4) - (area->dx >> 4) + 1;
169 start_mask = 0xffff0000 >> (area->dx & 0xf);
170 end_mask = 0x7ffff >> (x_end & 0xf);
171 out_8(AP_CONTROL_0,
172 (((area->dx & 0xf) - (area->sx & 0xf)) % 16) | (0x4 << 5));
173 if ((area->dx & 0xf) < (area->sx & 0xf))
174 pre_read = 1;
175 } else {
176 y_delta = -((info->fix.line_length * 8) - area->sx - area->width);
177 x_end = area->dx - area->width + 1;
178 x_word_count = (area->dx >> 4) - (x_end >> 4) + 1;
179 start_mask = 0x7ffff >> (area->dx & 0xf);
180 end_mask = 0xffff0000 >> (x_end & 0xf);
181 out_8(AP_CONTROL_0,
182 ((-((area->sx & 0xf) - (area->dx & 0xf))) % 16) |
183 (0x4 << 5));
184 if ((area->dx & 0xf) > (area->sx & 0xf))
185 pre_read = 1;
186 }
187
188 for (i = 0; i < area->height; i++) {
189
190 out_8(AP_CONTROL_3A, 0xc | (dest >> 16));
191
192 if (pre_read) {
193 dummy = *src;
194 src += incr;
195 }
196
197 if (x_word_count) {
198 out_8(AP_WRITE_ENABLE, start_mask);
199 *src = dest;
200 src += incr;
201 dest += incr;
202 out_8(AP_WRITE_ENABLE, 0);
203
204 for (j = 1; j < (x_word_count - 1); j++) {
205 *src = dest;
206 src += incr;
207 dest += incr;
208 }
209
210 out_8(AP_WRITE_ENABLE, start_mask);
211 *src = dest;
212 dest += incr;
213 src += incr;
214 } else {
215 out_8(AP_WRITE_ENABLE, start_mask | end_mask);
216 *src = dest;
217 dest += incr;
218 src += incr;
219 }
220 src += (y_delta / 16);
221 dest += (y_delta / 16);
222 }
223 out_8(AP_CONTROL_0, NORMAL_MODE);
224}
225
226/*
227 * Initialization
228 */
229
230static int dnfb_probe(struct platform_device *dev)
231{
232 struct fb_info *info;
233 int err = 0;
234
235 info = framebuffer_alloc(0, &dev->dev);
236 if (!info)
237 return -ENOMEM;
238
239 info->fbops = &dn_fb_ops;
240 info->fix = dnfb_fix;
241 info->var = dnfb_var;
242 info->var.red.length = 1;
243 info->var.red.offset = 0;
244 info->var.green = info->var.blue = info->var.red;
245 info->screen_base = (u_char *) info->fix.smem_start;
246
247 err = fb_alloc_cmap(&info->cmap, 2, 0);
248 if (err < 0)
249 goto release_framebuffer;
250
251 err = register_framebuffer(info);
252 if (err < 0) {
253 fb_dealloc_cmap(&info->cmap);
254 goto release_framebuffer;
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
269release_framebuffer:
270 framebuffer_release(info);
271 return err;
272}
273
274static struct platform_driver dnfb_driver = {
275 .probe = dnfb_probe,
276 .driver = {
277 .name = "dnfb",
278 },
279};
280
281static struct platform_device dnfb_device = {
282 .name = "dnfb",
283};
284
285static int __init dnfb_init(void)
286{
287 int ret;
288
289 if (!MACH_IS_APOLLO)
290 return -ENODEV;
291
292 if (fb_get_options("dnfb", NULL))
293 return -ENODEV;
294
295 ret = platform_driver_register(&dnfb_driver);
296
297 if (!ret) {
298 ret = platform_device_register(&dnfb_device);
299 if (ret)
300 platform_driver_unregister(&dnfb_driver);
301 }
302 return ret;
303}
304
305module_init(dnfb_init);
306
307MODULE_LICENSE("GPL");