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Diffstat (limited to '')
| -rw-r--r-- | drivers/video/fbdev/hpfb.c | 426 |
1 files changed, 426 insertions, 0 deletions
diff --git a/drivers/video/fbdev/hpfb.c b/drivers/video/fbdev/hpfb.c new file mode 100644 index 000000000..cdd44e5de --- /dev/null +++ b/drivers/video/fbdev/hpfb.c @@ -0,0 +1,426 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * HP300 Topcat framebuffer support (derived from macfb of all things) + * Phil Blundell <philb@gnu.org> 1998 + * DIO-II, colour map and Catseye support by + * Kars de Jong <jongk@linux-m68k.org>, May 2004. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/fb.h> +#include <linux/dio.h> + +#include <asm/io.h> +#include <linux/uaccess.h> + +static struct fb_info fb_info = { + .fix = { + .id = "HP300 ", + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_PSEUDOCOLOR, + .accel = FB_ACCEL_NONE, + } +}; + +static unsigned long fb_regs; +static unsigned char fb_bitmask; + +#define TC_NBLANK 0x4080 +#define TC_WEN 0x4088 +#define TC_REN 0x408c +#define TC_FBEN 0x4090 +#define TC_PRR 0x40ea + +/* These defines match the X window system */ +#define RR_CLEAR 0x0 +#define RR_COPY 0x3 +#define RR_NOOP 0x5 +#define RR_XOR 0x6 +#define RR_INVERT 0xa +#define RR_COPYINVERTED 0xc +#define RR_SET 0xf + +/* blitter regs */ +#define BUSY 0x4044 +#define WMRR 0x40ef +#define SOURCE_X 0x40f2 +#define SOURCE_Y 0x40f6 +#define DEST_X 0x40fa +#define DEST_Y 0x40fe +#define WHEIGHT 0x4106 +#define WWIDTH 0x4102 +#define WMOVE 0x409c + +static struct fb_var_screeninfo hpfb_defined = { + .red = { + .length = 8, + }, + .green = { + .length = 8, + }, + .blue = { + .length = 8, + }, + .activate = FB_ACTIVATE_NOW, + .height = -1, + .width = -1, + .vmode = FB_VMODE_NONINTERLACED, +}; + +static int hpfb_setcolreg(unsigned regno, unsigned red, unsigned green, + unsigned blue, unsigned transp, + struct fb_info *info) +{ + /* use MSBs */ + unsigned char _red =red>>8; + unsigned char _green=green>>8; + unsigned char _blue =blue>>8; + unsigned char _regno=regno; + + /* + * Set a single color register. The values supplied are + * already rounded down to the hardware's capabilities + * (according to the entries in the `var' structure). Return + * != 0 for invalid regno. + */ + + if (regno >= info->cmap.len) + return 1; + + while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1); + + out_be16(fb_regs + 0x60ba, 0xff); + + out_be16(fb_regs + 0x60b2, _red); + out_be16(fb_regs + 0x60b4, _green); + out_be16(fb_regs + 0x60b6, _blue); + out_be16(fb_regs + 0x60b8, ~_regno); + out_be16(fb_regs + 0x60f0, 0xff); + + udelay(100); + + while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1); + out_be16(fb_regs + 0x60b2, 0); + out_be16(fb_regs + 0x60b4, 0); + out_be16(fb_regs + 0x60b6, 0); + out_be16(fb_regs + 0x60b8, 0); + + return 0; +} + +/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */ + +static int hpfb_blank(int blank, struct fb_info *info) +{ + out_8(fb_regs + TC_NBLANK, (blank ? 0x00 : fb_bitmask)); + + return 0; +} + +static void topcat_blit(int x0, int y0, int x1, int y1, int w, int h, int rr) +{ + if (rr >= 0) { + while (in_8(fb_regs + BUSY) & fb_bitmask) + ; + } + out_8(fb_regs + TC_FBEN, fb_bitmask); + if (rr >= 0) { + out_8(fb_regs + TC_WEN, fb_bitmask); + out_8(fb_regs + WMRR, rr); + } + out_be16(fb_regs + SOURCE_X, x0); + out_be16(fb_regs + SOURCE_Y, y0); + out_be16(fb_regs + DEST_X, x1); + out_be16(fb_regs + DEST_Y, y1); + out_be16(fb_regs + WWIDTH, w); + out_be16(fb_regs + WHEIGHT, h); + out_8(fb_regs + WMOVE, fb_bitmask); +} + +static void hpfb_copyarea(struct fb_info *info, const struct fb_copyarea *area) +{ + topcat_blit(area->sx, area->sy, area->dx, area->dy, area->width, area->height, RR_COPY); +} + +static void hpfb_fillrect(struct fb_info *p, const struct fb_fillrect *region) +{ + u8 clr; + + clr = region->color & 0xff; + + while (in_8(fb_regs + BUSY) & fb_bitmask) + ; + + /* Foreground */ + out_8(fb_regs + TC_WEN, fb_bitmask & clr); + out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_SET : RR_INVERT)); + + /* Background */ + out_8(fb_regs + TC_WEN, fb_bitmask & ~clr); + out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_CLEAR : RR_NOOP)); + + topcat_blit(region->dx, region->dy, region->dx, region->dy, region->width, region->height, -1); +} + +static int hpfb_sync(struct fb_info *info) +{ + /* + * Since we also access the framebuffer directly, we have to wait + * until the block mover is finished + */ + while (in_8(fb_regs + BUSY) & fb_bitmask) + ; + + out_8(fb_regs + TC_WEN, fb_bitmask); + out_8(fb_regs + TC_PRR, RR_COPY); + out_8(fb_regs + TC_FBEN, fb_bitmask); + + return 0; +} + +static const struct fb_ops hpfb_ops = { + .owner = THIS_MODULE, + .fb_setcolreg = hpfb_setcolreg, + .fb_blank = hpfb_blank, + .fb_fillrect = hpfb_fillrect, + .fb_copyarea = hpfb_copyarea, + .fb_imageblit = cfb_imageblit, + .fb_sync = hpfb_sync, +}; + +/* Common to all HP framebuffers */ +#define HPFB_FBWMSB 0x05 /* Frame buffer width */ +#define HPFB_FBWLSB 0x07 +#define HPFB_FBHMSB 0x09 /* Frame buffer height */ +#define HPFB_FBHLSB 0x0b +#define HPFB_DWMSB 0x0d /* Display width */ +#define HPFB_DWLSB 0x0f +#define HPFB_DHMSB 0x11 /* Display height */ +#define HPFB_DHLSB 0x13 +#define HPFB_NUMPLANES 0x5b /* Number of colour planes */ +#define HPFB_FBOMSB 0x5d /* Frame buffer offset */ +#define HPFB_FBOLSB 0x5f + +static int hpfb_init_one(unsigned long phys_base, unsigned long virt_base) +{ + unsigned long fboff, fb_width, fb_height, fb_start; + int ret; + + fb_regs = virt_base; + fboff = (in_8(fb_regs + HPFB_FBOMSB) << 8) | in_8(fb_regs + HPFB_FBOLSB); + + fb_info.fix.smem_start = (in_8(fb_regs + fboff) << 16); + + if (phys_base >= DIOII_BASE) { + fb_info.fix.smem_start += phys_base; + } + + if (DIO_SECID(fb_regs) != DIO_ID2_TOPCAT) { + /* This is the magic incantation the HP X server uses to make Catseye boards work. */ + while (in_be16(fb_regs+0x4800) & 1) + ; + out_be16(fb_regs+0x4800, 0); /* Catseye status */ + out_be16(fb_regs+0x4510, 0); /* VB */ + out_be16(fb_regs+0x4512, 0); /* TCNTRL */ + out_be16(fb_regs+0x4514, 0); /* ACNTRL */ + out_be16(fb_regs+0x4516, 0); /* PNCNTRL */ + out_be16(fb_regs+0x4206, 0x90); /* RUG Command/Status */ + out_be16(fb_regs+0x60a2, 0); /* Overlay Mask */ + out_be16(fb_regs+0x60bc, 0); /* Ram Select */ + } + + /* + * Fill in the available video resolution + */ + fb_width = (in_8(fb_regs + HPFB_FBWMSB) << 8) | in_8(fb_regs + HPFB_FBWLSB); + fb_info.fix.line_length = fb_width; + fb_height = (in_8(fb_regs + HPFB_FBHMSB) << 8) | in_8(fb_regs + HPFB_FBHLSB); + fb_info.fix.smem_len = fb_width * fb_height; + fb_start = (unsigned long)ioremap_wt(fb_info.fix.smem_start, + fb_info.fix.smem_len); + hpfb_defined.xres = (in_8(fb_regs + HPFB_DWMSB) << 8) | in_8(fb_regs + HPFB_DWLSB); + hpfb_defined.yres = (in_8(fb_regs + HPFB_DHMSB) << 8) | in_8(fb_regs + HPFB_DHLSB); + hpfb_defined.xres_virtual = hpfb_defined.xres; + hpfb_defined.yres_virtual = hpfb_defined.yres; + hpfb_defined.bits_per_pixel = in_8(fb_regs + HPFB_NUMPLANES); + + printk(KERN_INFO "hpfb: framebuffer at 0x%lx, mapped to 0x%lx, size %dk\n", + fb_info.fix.smem_start, fb_start, fb_info.fix.smem_len/1024); + printk(KERN_INFO "hpfb: mode is %dx%dx%d, linelength=%d\n", + hpfb_defined.xres, hpfb_defined.yres, hpfb_defined.bits_per_pixel, fb_info.fix.line_length); + + /* + * Give the hardware a bit of a prod and work out how many bits per + * pixel are supported. + */ + out_8(fb_regs + TC_WEN, 0xff); + out_8(fb_regs + TC_PRR, RR_COPY); + out_8(fb_regs + TC_FBEN, 0xff); + out_8(fb_start, 0xff); + fb_bitmask = in_8(fb_start); + out_8(fb_start, 0); + + /* + * Enable reading/writing of all the planes. + */ + out_8(fb_regs + TC_WEN, fb_bitmask); + out_8(fb_regs + TC_PRR, RR_COPY); + out_8(fb_regs + TC_REN, fb_bitmask); + out_8(fb_regs + TC_FBEN, fb_bitmask); + + /* + * Clear the screen. + */ + topcat_blit(0, 0, 0, 0, fb_width, fb_height, RR_CLEAR); + + /* + * Let there be consoles.. + */ + if (DIO_SECID(fb_regs) == DIO_ID2_TOPCAT) + strcat(fb_info.fix.id, "Topcat"); + else + strcat(fb_info.fix.id, "Catseye"); + fb_info.fbops = &hpfb_ops; + fb_info.flags = FBINFO_DEFAULT; + fb_info.var = hpfb_defined; + fb_info.screen_base = (char *)fb_start; + + ret = fb_alloc_cmap(&fb_info.cmap, 1 << hpfb_defined.bits_per_pixel, 0); + if (ret < 0) + goto unmap_screen_base; + + ret = register_framebuffer(&fb_info); + if (ret < 0) + goto dealloc_cmap; + + fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id); + + return 0; + +dealloc_cmap: + fb_dealloc_cmap(&fb_info.cmap); + +unmap_screen_base: + if (fb_info.screen_base) { + iounmap(fb_info.screen_base); + fb_info.screen_base = NULL; + } + + return ret; +} + +/* + * Check that the secondary ID indicates that we have some hope of working with this + * framebuffer. The catseye boards are pretty much like topcats and we can muddle through. + */ + +#define topcat_sid_ok(x) (((x) == DIO_ID2_LRCATSEYE) || ((x) == DIO_ID2_HRCCATSEYE) \ + || ((x) == DIO_ID2_HRMCATSEYE) || ((x) == DIO_ID2_TOPCAT)) + +/* + * Initialise the framebuffer + */ +static int hpfb_dio_probe(struct dio_dev *d, const struct dio_device_id *ent) +{ + unsigned long paddr, vaddr; + + paddr = d->resource.start; + if (!request_mem_region(d->resource.start, resource_size(&d->resource), d->name)) + return -EBUSY; + + if (d->scode >= DIOII_SCBASE) { + vaddr = (unsigned long)ioremap(paddr, resource_size(&d->resource)); + } else { + vaddr = paddr + DIO_VIRADDRBASE; + } + printk(KERN_INFO "Topcat found at DIO select code %d " + "(secondary id %02x)\n", d->scode, (d->id >> 8) & 0xff); + if (hpfb_init_one(paddr, vaddr)) { + if (d->scode >= DIOII_SCBASE) + iounmap((void *)vaddr); + return -ENOMEM; + } + return 0; +} + +static void hpfb_remove_one(struct dio_dev *d) +{ + unregister_framebuffer(&fb_info); + if (d->scode >= DIOII_SCBASE) + iounmap((void *)fb_regs); + release_mem_region(d->resource.start, resource_size(&d->resource)); + fb_dealloc_cmap(&fb_info.cmap); + if (fb_info.screen_base) + iounmap(fb_info.screen_base); +} + +static struct dio_device_id hpfb_dio_tbl[] = { + { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_LRCATSEYE) }, + { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRCCATSEYE) }, + { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRMCATSEYE) }, + { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_TOPCAT) }, + { 0 } +}; + +static struct dio_driver hpfb_driver = { + .name = "hpfb", + .id_table = hpfb_dio_tbl, + .probe = hpfb_dio_probe, + .remove = hpfb_remove_one, +}; + +static int __init hpfb_init(void) +{ + unsigned int sid; + unsigned char i; + int err; + + /* Topcats can be on the internal IO bus or real DIO devices. + * The internal variant sits at 0x560000; it has primary + * and secondary ID registers just like the DIO version. + * So we merge the two detection routines. + * + * Perhaps this #define should be in a global header file: + * I believe it's common to all internal fbs, not just topcat. + */ +#define INTFBVADDR 0xf0560000 +#define INTFBPADDR 0x560000 + + if (!MACH_IS_HP300) + return -ENODEV; + + if (fb_get_options("hpfb", NULL)) + return -ENODEV; + + err = dio_register_driver(&hpfb_driver); + if (err) + return err; + + err = copy_from_kernel_nofault(&i, (unsigned char *)INTFBVADDR + DIO_IDOFF, 1); + + if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) { + if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat")) + return -EBUSY; + printk(KERN_INFO "Internal Topcat found (secondary id %02x)\n", sid); + if (hpfb_init_one(INTFBPADDR, INTFBVADDR)) { + return -ENOMEM; + } + } + return 0; +} + +static void __exit hpfb_cleanup_module(void) +{ + dio_unregister_driver(&hpfb_driver); +} + +module_init(hpfb_init); +module_exit(hpfb_cleanup_module); + +MODULE_LICENSE("GPL"); |