427 lines
11 KiB
C
427 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* HP300 Topcat framebuffer support (derived from macfb of all things)
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* Phil Blundell <philb@gnu.org> 1998
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* DIO-II, colour map and Catseye support by
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* Kars de Jong <jongk@linux-m68k.org>, May 2004.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/fb.h>
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#include <linux/dio.h>
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#include <asm/io.h>
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#include <linux/uaccess.h>
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static struct fb_info fb_info = {
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.fix = {
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.id = "HP300 ",
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_PSEUDOCOLOR,
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.accel = FB_ACCEL_NONE,
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}
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};
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static unsigned long fb_regs;
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static unsigned char fb_bitmask;
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#define TC_NBLANK 0x4080
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#define TC_WEN 0x4088
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#define TC_REN 0x408c
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#define TC_FBEN 0x4090
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#define TC_PRR 0x40ea
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/* These defines match the X window system */
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#define RR_CLEAR 0x0
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#define RR_COPY 0x3
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#define RR_NOOP 0x5
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#define RR_XOR 0x6
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#define RR_INVERT 0xa
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#define RR_COPYINVERTED 0xc
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#define RR_SET 0xf
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/* blitter regs */
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#define BUSY 0x4044
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#define WMRR 0x40ef
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#define SOURCE_X 0x40f2
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#define SOURCE_Y 0x40f6
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#define DEST_X 0x40fa
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#define DEST_Y 0x40fe
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#define WHEIGHT 0x4106
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#define WWIDTH 0x4102
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#define WMOVE 0x409c
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static struct fb_var_screeninfo hpfb_defined = {
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.red = {
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.length = 8,
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},
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.green = {
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.length = 8,
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},
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.blue = {
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.length = 8,
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},
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.activate = FB_ACTIVATE_NOW,
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.height = -1,
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.width = -1,
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.vmode = FB_VMODE_NONINTERLACED,
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};
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static int hpfb_setcolreg(unsigned regno, unsigned red, unsigned green,
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unsigned blue, unsigned transp,
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struct fb_info *info)
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{
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/* use MSBs */
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unsigned char _red =red>>8;
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unsigned char _green=green>>8;
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unsigned char _blue =blue>>8;
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unsigned char _regno=regno;
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/*
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* Set a single color register. The values supplied are
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* already rounded down to the hardware's capabilities
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* (according to the entries in the `var' structure). Return
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* != 0 for invalid regno.
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*/
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if (regno >= info->cmap.len)
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return 1;
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while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
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out_be16(fb_regs + 0x60ba, 0xff);
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out_be16(fb_regs + 0x60b2, _red);
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out_be16(fb_regs + 0x60b4, _green);
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out_be16(fb_regs + 0x60b6, _blue);
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out_be16(fb_regs + 0x60b8, ~_regno);
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out_be16(fb_regs + 0x60f0, 0xff);
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udelay(100);
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while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
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out_be16(fb_regs + 0x60b2, 0);
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out_be16(fb_regs + 0x60b4, 0);
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out_be16(fb_regs + 0x60b6, 0);
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out_be16(fb_regs + 0x60b8, 0);
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return 0;
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}
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/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
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static int hpfb_blank(int blank, struct fb_info *info)
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{
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out_8(fb_regs + TC_NBLANK, (blank ? 0x00 : fb_bitmask));
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return 0;
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}
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static void topcat_blit(int x0, int y0, int x1, int y1, int w, int h, int rr)
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{
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if (rr >= 0) {
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while (in_8(fb_regs + BUSY) & fb_bitmask)
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;
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}
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out_8(fb_regs + TC_FBEN, fb_bitmask);
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if (rr >= 0) {
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out_8(fb_regs + TC_WEN, fb_bitmask);
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out_8(fb_regs + WMRR, rr);
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}
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out_be16(fb_regs + SOURCE_X, x0);
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out_be16(fb_regs + SOURCE_Y, y0);
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out_be16(fb_regs + DEST_X, x1);
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out_be16(fb_regs + DEST_Y, y1);
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out_be16(fb_regs + WWIDTH, w);
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out_be16(fb_regs + WHEIGHT, h);
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out_8(fb_regs + WMOVE, fb_bitmask);
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}
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static void hpfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
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{
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topcat_blit(area->sx, area->sy, area->dx, area->dy, area->width, area->height, RR_COPY);
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}
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static void hpfb_fillrect(struct fb_info *p, const struct fb_fillrect *region)
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{
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u8 clr;
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clr = region->color & 0xff;
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while (in_8(fb_regs + BUSY) & fb_bitmask)
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;
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/* Foreground */
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out_8(fb_regs + TC_WEN, fb_bitmask & clr);
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out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_SET : RR_INVERT));
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/* Background */
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out_8(fb_regs + TC_WEN, fb_bitmask & ~clr);
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out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_CLEAR : RR_NOOP));
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topcat_blit(region->dx, region->dy, region->dx, region->dy, region->width, region->height, -1);
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}
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static int hpfb_sync(struct fb_info *info)
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{
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/*
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* Since we also access the framebuffer directly, we have to wait
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* until the block mover is finished
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*/
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while (in_8(fb_regs + BUSY) & fb_bitmask)
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;
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out_8(fb_regs + TC_WEN, fb_bitmask);
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out_8(fb_regs + TC_PRR, RR_COPY);
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out_8(fb_regs + TC_FBEN, fb_bitmask);
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return 0;
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}
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static struct fb_ops hpfb_ops = {
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.owner = THIS_MODULE,
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.fb_setcolreg = hpfb_setcolreg,
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.fb_blank = hpfb_blank,
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.fb_fillrect = hpfb_fillrect,
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.fb_copyarea = hpfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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.fb_sync = hpfb_sync,
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};
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/* Common to all HP framebuffers */
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#define HPFB_FBWMSB 0x05 /* Frame buffer width */
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#define HPFB_FBWLSB 0x07
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#define HPFB_FBHMSB 0x09 /* Frame buffer height */
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#define HPFB_FBHLSB 0x0b
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#define HPFB_DWMSB 0x0d /* Display width */
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#define HPFB_DWLSB 0x0f
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#define HPFB_DHMSB 0x11 /* Display height */
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#define HPFB_DHLSB 0x13
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#define HPFB_NUMPLANES 0x5b /* Number of colour planes */
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#define HPFB_FBOMSB 0x5d /* Frame buffer offset */
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#define HPFB_FBOLSB 0x5f
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static int hpfb_init_one(unsigned long phys_base, unsigned long virt_base)
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{
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unsigned long fboff, fb_width, fb_height, fb_start;
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int ret;
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fb_regs = virt_base;
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fboff = (in_8(fb_regs + HPFB_FBOMSB) << 8) | in_8(fb_regs + HPFB_FBOLSB);
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fb_info.fix.smem_start = (in_8(fb_regs + fboff) << 16);
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if (phys_base >= DIOII_BASE) {
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fb_info.fix.smem_start += phys_base;
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}
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if (DIO_SECID(fb_regs) != DIO_ID2_TOPCAT) {
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/* This is the magic incantation the HP X server uses to make Catseye boards work. */
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while (in_be16(fb_regs+0x4800) & 1)
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;
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out_be16(fb_regs+0x4800, 0); /* Catseye status */
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out_be16(fb_regs+0x4510, 0); /* VB */
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out_be16(fb_regs+0x4512, 0); /* TCNTRL */
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out_be16(fb_regs+0x4514, 0); /* ACNTRL */
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out_be16(fb_regs+0x4516, 0); /* PNCNTRL */
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out_be16(fb_regs+0x4206, 0x90); /* RUG Command/Status */
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out_be16(fb_regs+0x60a2, 0); /* Overlay Mask */
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out_be16(fb_regs+0x60bc, 0); /* Ram Select */
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}
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/*
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* Fill in the available video resolution
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*/
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fb_width = (in_8(fb_regs + HPFB_FBWMSB) << 8) | in_8(fb_regs + HPFB_FBWLSB);
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fb_info.fix.line_length = fb_width;
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fb_height = (in_8(fb_regs + HPFB_FBHMSB) << 8) | in_8(fb_regs + HPFB_FBHLSB);
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fb_info.fix.smem_len = fb_width * fb_height;
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fb_start = (unsigned long)ioremap_wt(fb_info.fix.smem_start,
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fb_info.fix.smem_len);
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hpfb_defined.xres = (in_8(fb_regs + HPFB_DWMSB) << 8) | in_8(fb_regs + HPFB_DWLSB);
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hpfb_defined.yres = (in_8(fb_regs + HPFB_DHMSB) << 8) | in_8(fb_regs + HPFB_DHLSB);
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hpfb_defined.xres_virtual = hpfb_defined.xres;
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hpfb_defined.yres_virtual = hpfb_defined.yres;
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hpfb_defined.bits_per_pixel = in_8(fb_regs + HPFB_NUMPLANES);
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printk(KERN_INFO "hpfb: framebuffer at 0x%lx, mapped to 0x%lx, size %dk\n",
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fb_info.fix.smem_start, fb_start, fb_info.fix.smem_len/1024);
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printk(KERN_INFO "hpfb: mode is %dx%dx%d, linelength=%d\n",
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hpfb_defined.xres, hpfb_defined.yres, hpfb_defined.bits_per_pixel, fb_info.fix.line_length);
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/*
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* Give the hardware a bit of a prod and work out how many bits per
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* pixel are supported.
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*/
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out_8(fb_regs + TC_WEN, 0xff);
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out_8(fb_regs + TC_PRR, RR_COPY);
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out_8(fb_regs + TC_FBEN, 0xff);
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out_8(fb_start, 0xff);
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fb_bitmask = in_8(fb_start);
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out_8(fb_start, 0);
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/*
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* Enable reading/writing of all the planes.
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*/
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out_8(fb_regs + TC_WEN, fb_bitmask);
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out_8(fb_regs + TC_PRR, RR_COPY);
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out_8(fb_regs + TC_REN, fb_bitmask);
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out_8(fb_regs + TC_FBEN, fb_bitmask);
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/*
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* Clear the screen.
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*/
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topcat_blit(0, 0, 0, 0, fb_width, fb_height, RR_CLEAR);
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/*
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* Let there be consoles..
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*/
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if (DIO_SECID(fb_regs) == DIO_ID2_TOPCAT)
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strcat(fb_info.fix.id, "Topcat");
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else
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strcat(fb_info.fix.id, "Catseye");
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fb_info.fbops = &hpfb_ops;
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fb_info.flags = FBINFO_DEFAULT;
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fb_info.var = hpfb_defined;
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fb_info.screen_base = (char *)fb_start;
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ret = fb_alloc_cmap(&fb_info.cmap, 1 << hpfb_defined.bits_per_pixel, 0);
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if (ret < 0)
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goto unmap_screen_base;
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ret = register_framebuffer(&fb_info);
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if (ret < 0)
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goto dealloc_cmap;
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fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id);
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return 0;
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dealloc_cmap:
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fb_dealloc_cmap(&fb_info.cmap);
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unmap_screen_base:
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if (fb_info.screen_base) {
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iounmap(fb_info.screen_base);
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fb_info.screen_base = NULL;
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}
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return ret;
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}
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/*
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* Check that the secondary ID indicates that we have some hope of working with this
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* framebuffer. The catseye boards are pretty much like topcats and we can muddle through.
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*/
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#define topcat_sid_ok(x) (((x) == DIO_ID2_LRCATSEYE) || ((x) == DIO_ID2_HRCCATSEYE) \
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|| ((x) == DIO_ID2_HRMCATSEYE) || ((x) == DIO_ID2_TOPCAT))
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/*
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* Initialise the framebuffer
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*/
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static int hpfb_dio_probe(struct dio_dev *d, const struct dio_device_id *ent)
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{
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unsigned long paddr, vaddr;
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paddr = d->resource.start;
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if (!request_mem_region(d->resource.start, resource_size(&d->resource), d->name))
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return -EBUSY;
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if (d->scode >= DIOII_SCBASE) {
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vaddr = (unsigned long)ioremap(paddr, resource_size(&d->resource));
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} else {
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vaddr = paddr + DIO_VIRADDRBASE;
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}
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printk(KERN_INFO "Topcat found at DIO select code %d "
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"(secondary id %02x)\n", d->scode, (d->id >> 8) & 0xff);
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if (hpfb_init_one(paddr, vaddr)) {
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if (d->scode >= DIOII_SCBASE)
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iounmap((void *)vaddr);
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return -ENOMEM;
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}
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return 0;
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}
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static void hpfb_remove_one(struct dio_dev *d)
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{
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unregister_framebuffer(&fb_info);
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if (d->scode >= DIOII_SCBASE)
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iounmap((void *)fb_regs);
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release_mem_region(d->resource.start, resource_size(&d->resource));
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fb_dealloc_cmap(&fb_info.cmap);
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if (fb_info.screen_base)
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iounmap(fb_info.screen_base);
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}
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static struct dio_device_id hpfb_dio_tbl[] = {
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{ DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_LRCATSEYE) },
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{ DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRCCATSEYE) },
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{ DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRMCATSEYE) },
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{ DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_TOPCAT) },
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{ 0 }
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};
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static struct dio_driver hpfb_driver = {
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.name = "hpfb",
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.id_table = hpfb_dio_tbl,
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.probe = hpfb_dio_probe,
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.remove = hpfb_remove_one,
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};
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int __init hpfb_init(void)
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{
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unsigned int sid;
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unsigned char i;
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int err;
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/* Topcats can be on the internal IO bus or real DIO devices.
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* The internal variant sits at 0x560000; it has primary
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* and secondary ID registers just like the DIO version.
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* So we merge the two detection routines.
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*
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* Perhaps this #define should be in a global header file:
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* I believe it's common to all internal fbs, not just topcat.
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*/
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#define INTFBVADDR 0xf0560000
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#define INTFBPADDR 0x560000
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if (!MACH_IS_HP300)
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return -ENODEV;
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if (fb_get_options("hpfb", NULL))
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return -ENODEV;
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err = dio_register_driver(&hpfb_driver);
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if (err)
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return err;
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err = probe_kernel_read(&i, (unsigned char *)INTFBVADDR + DIO_IDOFF, 1);
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if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) {
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if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat"))
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return -EBUSY;
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printk(KERN_INFO "Internal Topcat found (secondary id %02x)\n", sid);
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if (hpfb_init_one(INTFBPADDR, INTFBVADDR)) {
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return -ENOMEM;
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}
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}
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return 0;
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}
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void __exit hpfb_cleanup_module(void)
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{
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dio_unregister_driver(&hpfb_driver);
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}
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module_init(hpfb_init);
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module_exit(hpfb_cleanup_module);
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MODULE_LICENSE("GPL");
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