308 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2#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 + $x22 *23 * Note: these are the Memory/IO BASE definitions for a mono card set to the24 * alternate address25 *26 * Control 3A and 3B serve identical functions except that 3A27 * 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 0x0FA000043#define FRAME_BUFFER_LEN 0x4000044 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 in79 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 0x088#define SRC_AND_DEST 0x189#define SRC_AND_nDEST 0x290#define SRC 0x391#define nSRC_AND_DEST 0x492#define DEST 0x593#define SRC_XOR_DEST 0x694#define SRC_OR_DEST 0x795#define SRC_NOR_DEST 0x896#define SRC_XNOR_DEST 0x997#define nDEST 0xA98#define SRC_OR_nDEST 0xB99#define nSRC 0xC100#define nSRC_OR_DEST 0xD101#define SRC_NAND_DEST 0xE102#define DEST_ONE 0xF103 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 else146 out_8(AP_CONTROL_3A, 0x1);147 return 0;148}149 150static151void 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 * Initialization228 */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");308