diff options
Diffstat (limited to 'drivers/video/fbdev/dnfb.c')
| -rw-r--r-- | drivers/video/fbdev/dnfb.c | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/drivers/video/fbdev/dnfb.c b/drivers/video/fbdev/dnfb.c new file mode 100644 index 000000000..18405c402 --- /dev/null +++ b/drivers/video/fbdev/dnfb.c @@ -0,0 +1,305 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> + +#include <asm/setup.h> +#include <asm/irq.h> +#include <asm/amigahw.h> +#include <asm/amigaints.h> +#include <asm/apollohw.h> +#include <linux/fb.h> +#include <linux/module.h> + +/* apollo video HW definitions */ + +/* + * Control Registers. IOBASE + $x + * + * Note: these are the Memory/IO BASE definitions for a mono card set to the + * alternate address + * + * Control 3A and 3B serve identical functions except that 3A + * deals with control 1 and 3b deals with Color LUT reg. + */ + +#define AP_IOBASE 0x3b0 /* Base address of 1 plane board. */ +#define AP_STATUS isaIO2mem(AP_IOBASE+0) /* Status register. Read */ +#define AP_WRITE_ENABLE isaIO2mem(AP_IOBASE+0) /* Write Enable Register Write */ +#define AP_DEVICE_ID isaIO2mem(AP_IOBASE+1) /* Device ID Register. Read */ +#define AP_ROP_1 isaIO2mem(AP_IOBASE+2) /* Raster Operation reg. Write Word */ +#define AP_DIAG_MEM_REQ isaIO2mem(AP_IOBASE+4) /* Diagnostic Memory Request. Write Word */ +#define AP_CONTROL_0 isaIO2mem(AP_IOBASE+8) /* Control Register 0. Read/Write */ +#define AP_CONTROL_1 isaIO2mem(AP_IOBASE+0xa) /* Control Register 1. Read/Write */ +#define AP_CONTROL_3A isaIO2mem(AP_IOBASE+0xe) /* Control Register 3a. Read/Write */ +#define AP_CONTROL_2 isaIO2mem(AP_IOBASE+0xc) /* Control Register 2. Read/Write */ + + +#define FRAME_BUFFER_START 0x0FA0000 +#define FRAME_BUFFER_LEN 0x40000 + +/* CREG 0 */ +#define VECTOR_MODE 0x40 /* 010x.xxxx */ +#define DBLT_MODE 0x80 /* 100x.xxxx */ +#define NORMAL_MODE 0xE0 /* 111x.xxxx */ +#define SHIFT_BITS 0x1F /* xxx1.1111 */ + /* other bits are Shift value */ + +/* CREG 1 */ +#define AD_BLT 0x80 /* 1xxx.xxxx */ +#define NORMAL 0x80 /* 1xxx.xxxx */ /* What is happening here ?? */ +#define INVERSE 0x00 /* 0xxx.xxxx */ /* Clearing this reverses the screen */ +#define PIX_BLT 0x00 /* 0xxx.xxxx */ + +#define AD_HIBIT 0x40 /* xIxx.xxxx */ + +#define ROP_EN 0x10 /* xxx1.xxxx */ +#define DST_EQ_SRC 0x00 /* xxx0.xxxx */ +#define nRESET_SYNC 0x08 /* xxxx.1xxx */ +#define SYNC_ENAB 0x02 /* xxxx.xx1x */ + +#define BLANK_DISP 0x00 /* xxxx.xxx0 */ +#define ENAB_DISP 0x01 /* xxxx.xxx1 */ + +#define NORM_CREG1 (nRESET_SYNC | SYNC_ENAB | ENAB_DISP) /* no reset sync */ + +/* CREG 2 */ + +/* + * Following 3 defines are common to 1, 4 and 8 plane. + */ + +#define S_DATA_1s 0x00 /* 00xx.xxxx */ /* set source to all 1's -- vector drawing */ +#define S_DATA_PIX 0x40 /* 01xx.xxxx */ /* takes source from ls-bits and replicates over 16 bits */ +#define S_DATA_PLN 0xC0 /* 11xx.xxxx */ /* normal, each data access =16-bits in + one plane of image mem */ + +/* CREG 3A/CREG 3B */ +# define RESET_CREG 0x80 /* 1000.0000 */ + +/* ROP REG - all one nibble */ +/* ********* NOTE : this is used r0,r1,r2,r3 *********** */ +#define ROP(r2,r3,r0,r1) ( (U_SHORT)((r0)|((r1)<<4)|((r2)<<8)|((r3)<<12)) ) +#define DEST_ZERO 0x0 +#define SRC_AND_DEST 0x1 +#define SRC_AND_nDEST 0x2 +#define SRC 0x3 +#define nSRC_AND_DEST 0x4 +#define DEST 0x5 +#define SRC_XOR_DEST 0x6 +#define SRC_OR_DEST 0x7 +#define SRC_NOR_DEST 0x8 +#define SRC_XNOR_DEST 0x9 +#define nDEST 0xA +#define SRC_OR_nDEST 0xB +#define nSRC 0xC +#define nSRC_OR_DEST 0xD +#define SRC_NAND_DEST 0xE +#define DEST_ONE 0xF + +#define SWAP(A) ((A>>8) | ((A&0xff) <<8)) + +/* frame buffer operations */ + +static int dnfb_blank(int blank, struct fb_info *info); +static void dnfb_copyarea(struct fb_info *info, const struct fb_copyarea *area); + +static const struct fb_ops dn_fb_ops = { + .owner = THIS_MODULE, + .fb_blank = dnfb_blank, + .fb_fillrect = cfb_fillrect, + .fb_copyarea = dnfb_copyarea, + .fb_imageblit = cfb_imageblit, +}; + +static const struct fb_var_screeninfo dnfb_var = { + .xres = 1280, + .yres = 1024, + .xres_virtual = 2048, + .yres_virtual = 1024, + .bits_per_pixel = 1, + .height = -1, + .width = -1, + .vmode = FB_VMODE_NONINTERLACED, +}; + +static const struct fb_fix_screeninfo dnfb_fix = { + .id = "Apollo Mono", + .smem_start = (FRAME_BUFFER_START + IO_BASE), + .smem_len = FRAME_BUFFER_LEN, + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_MONO10, + .line_length = 256, +}; + +static int dnfb_blank(int blank, struct fb_info *info) +{ + if (blank) + out_8(AP_CONTROL_3A, 0x0); + else + out_8(AP_CONTROL_3A, 0x1); + return 0; +} + +static +void dnfb_copyarea(struct fb_info *info, const struct fb_copyarea *area) +{ + + int incr, y_delta, pre_read = 0, x_end, x_word_count; + uint start_mask, end_mask, dest; + ushort *src, dummy; + short i, j; + + incr = (area->dy <= area->sy) ? 1 : -1; + + src = (ushort *)(info->screen_base + area->sy * info->fix.line_length + + (area->sx >> 4)); + dest = area->dy * (info->fix.line_length >> 1) + (area->dx >> 4); + + if (incr > 0) { + y_delta = (info->fix.line_length * 8) - area->sx - area->width; + x_end = area->dx + area->width - 1; + x_word_count = (x_end >> 4) - (area->dx >> 4) + 1; + start_mask = 0xffff0000 >> (area->dx & 0xf); + end_mask = 0x7ffff >> (x_end & 0xf); + out_8(AP_CONTROL_0, + (((area->dx & 0xf) - (area->sx & 0xf)) % 16) | (0x4 << 5)); + if ((area->dx & 0xf) < (area->sx & 0xf)) + pre_read = 1; + } else { + y_delta = -((info->fix.line_length * 8) - area->sx - area->width); + x_end = area->dx - area->width + 1; + x_word_count = (area->dx >> 4) - (x_end >> 4) + 1; + start_mask = 0x7ffff >> (area->dx & 0xf); + end_mask = 0xffff0000 >> (x_end & 0xf); + out_8(AP_CONTROL_0, + ((-((area->sx & 0xf) - (area->dx & 0xf))) % 16) | + (0x4 << 5)); + if ((area->dx & 0xf) > (area->sx & 0xf)) + pre_read = 1; + } + + for (i = 0; i < area->height; i++) { + + out_8(AP_CONTROL_3A, 0xc | (dest >> 16)); + + if (pre_read) { + dummy = *src; + src += incr; + } + + if (x_word_count) { + out_8(AP_WRITE_ENABLE, start_mask); + *src = dest; + src += incr; + dest += incr; + out_8(AP_WRITE_ENABLE, 0); + + for (j = 1; j < (x_word_count - 1); j++) { + *src = dest; + src += incr; + dest += incr; + } + + out_8(AP_WRITE_ENABLE, start_mask); + *src = dest; + dest += incr; + src += incr; + } else { + out_8(AP_WRITE_ENABLE, start_mask | end_mask); + *src = dest; + dest += incr; + src += incr; + } + src += (y_delta / 16); + dest += (y_delta / 16); + } + out_8(AP_CONTROL_0, NORMAL_MODE); +} + +/* + * Initialization + */ + +static int dnfb_probe(struct platform_device *dev) +{ + struct fb_info *info; + int err = 0; + + info = framebuffer_alloc(0, &dev->dev); + if (!info) + return -ENOMEM; + + info->fbops = &dn_fb_ops; + info->fix = dnfb_fix; + info->var = dnfb_var; + info->var.red.length = 1; + info->var.red.offset = 0; + info->var.green = info->var.blue = info->var.red; + info->screen_base = (u_char *) info->fix.smem_start; + + err = fb_alloc_cmap(&info->cmap, 2, 0); + if (err < 0) + goto release_framebuffer; + + err = register_framebuffer(info); + if (err < 0) { + fb_dealloc_cmap(&info->cmap); + goto release_framebuffer; + } + platform_set_drvdata(dev, info); + + /* now we have registered we can safely setup the hardware */ + out_8(AP_CONTROL_3A, RESET_CREG); + out_be16(AP_WRITE_ENABLE, 0x0); + out_8(AP_CONTROL_0, NORMAL_MODE); + out_8(AP_CONTROL_1, (AD_BLT | DST_EQ_SRC | NORM_CREG1)); + out_8(AP_CONTROL_2, S_DATA_PLN); + out_be16(AP_ROP_1, SWAP(0x3)); + + printk("apollo frame buffer alive and kicking !\n"); + return err; + +release_framebuffer: + framebuffer_release(info); + return err; +} + +static struct platform_driver dnfb_driver = { + .probe = dnfb_probe, + .driver = { + .name = "dnfb", + }, +}; + +static struct platform_device dnfb_device = { + .name = "dnfb", +}; + +static int __init dnfb_init(void) +{ + int ret; + + if (!MACH_IS_APOLLO) + return -ENODEV; + + if (fb_get_options("dnfb", NULL)) + return -ENODEV; + + ret = platform_driver_register(&dnfb_driver); + + if (!ret) { + ret = platform_device_register(&dnfb_device); + if (ret) + platform_driver_unregister(&dnfb_driver); + } + return ret; +} + +module_init(dnfb_init); + +MODULE_LICENSE("GPL"); |