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/* $Id: sun-bwtwo.c,v 1.1.1.4 2018/04/24 16:45:28 root Exp $ */

/* machine/sun/sun-bwtwo.c - Sun bwtwo emulation: */

/*
 * Copyright (c) 2003, 2004, 2006 Matt Fredette
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Matt Fredette.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <tme/common.h>
_TME_RCSID("$Id: sun-bwtwo.c,v 1.1.1.4 2018/04/24 16:45:28 root Exp $");

/* includes: */
#include <tme/machine/sun.h>
#include <tme/generic/bus-device.h>
#include <tme/generic/fb.h>
#include "sun-fb.h"

/* macros: */

/* bwtwo types: */
#define TME_SUNBW2_TYPE_NULL		(0)
#define TME_SUNBW2_TYPE_MULTIBUS	(1)
#define TME_SUNBW2_TYPE_OLD_ONBOARD	(2)
#define TME_SUNBW2_TYPE_ONBOARD		(3)
#define TME_SUNBW2_TYPE_P4		(4)
#define TME_SUNBW2_TYPE_SBUS		(5)

/* register offsets and sizes: */
#define TME_SUNBW2_REG_CSR_MULTIBUS	(0x81800)
#define TME_SUNBW2_REG_CSR_OLD_ONBOARD	(0x20000)
#define TME_SUNBW2_SIZ_CSR		(0x00002)
#define TME_SUNBW2_SIZ_CSR_PAGE		(0x00800)

/* the bits in the Multibus and old-onboard Control/Status register: */
#define TME_SUNBW2_CSR_ENABLE_VIDEO	(0x8000)	/* enable video */
#define TME_SUNBW2_CSR_ENABLE_COPY	(0x4000)	/* enable copy mode */
#define TME_SUNBW2_CSR_ENABLE_INT	(0x2000)	/* interrupt enable */
#define TME_SUNBW2_CSR_INT_ACTIVE	(0x1000)	/* interrupt is active */
#define TME_SUNBW2_CSR_JUMPER_B		(0x0800)	/* jumper B */
#define TME_SUNBW2_CSR_JUMPER_A		(0x0400)	/* jumper A */
#define TME_SUNBW2_CSR_JUMPER_COLOR	(0x0200)	/* jumper color */
#define TME_SUNBW2_CSR_JUMPER_HIRES	(0x0100)	/* jumper hires */
#define TME_SUNBW2_CSR_COPYBASE_MASK	(0x007E)	/* copybase mask */

#if 0
#define TME_SUNBW2_DEBUG
#endif

/* structures: */

/* the card: */
struct tme_sunbw2 {

  /* our generic Sun framebuffer: */
  struct tme_sunfb tme_sunbw2_sunfb;
#define tme_sunbw2_mutex tme_sunbw2_sunfb.tme_sunfb_mutex
#define tme_sunbw2_bus_subregion_memory tme_sunbw2_sunfb.tme_sunfb_bus_subregion_memory
#define tme_sunbw2_bus_subregion_regs tme_sunbw2_sunfb.tme_sunfb_bus_subregion_regs
#define tme_sunbw2_csr_address tme_sunbw2_bus_subregion_regs.tme_bus_subregion_address_first

  /* the type of the bwtwo: */
  tme_uint32_t tme_sunbw2_type;

  /* our csr: */
  tme_uint16_t tme_sunbw2_csr;
};

#if 1
static int sunbw2_copy;
static int sunbw2_copy_addr;
int get_sunbw2_copy(void) { return sunbw2_copy; }
int get_sunbw2_copy_addr(void) { return sunbw2_copy_addr; }
#endif

#ifdef TME_SUNBW2_DEBUG
#define TME_SUNBW2_LO_WIDTH	(1152)
#define TME_SUNBW2_LO_HEIGHT	(900)
static int
_tme_sunbw2_update_debug(struct tme_fb_connection *conn_fb)
{
  struct tme_sunbw2 *sunbw2;
  static int y = -1;
  static int x;
  unsigned long pixel;
  unsigned int pixel_byte;
  tme_uint8_t pixel_bit;
  int box, box_y, box_x;

  sunbw2 = conn_fb->tme_fb_connection.tme_connection_element->tme_element_private;

  for (box = 0; box < 2; box++) {
    if (y < 0) {
      y = 16;
      x = 0;
      continue;
    }
    for (box_y = 0; box_y < 2; box_y++) {
      for (box_x = 0; box_x < 2; box_x++) {
	pixel = (((y + box_y)
		  * TME_SUNBW2_LO_WIDTH)
		 + x
		 + box_x);
	pixel_byte = (pixel / 8);
	pixel_bit = (0x80 >> (pixel % 8));
	sunbw2->tme_sunbw2_fb_memory[pixel_byte] ^= pixel_bit;
      }
    }
    if (box == 0) {
      x += 2;
      if (x == TME_SUNBW2_LO_WIDTH) {
	x = 0;
	y += 2;
	if (y == TME_SUNBW2_LO_HEIGHT) {
	  y = 0;
	}
      }
    }
  }
    
  return (TME_OK);
}
#undef TME_SUNBW2_LO_WIDTH
#undef TME_SUNBW2_LO_HEIGHT
#endif /* TME_SUNBW2_DEBUG */

/* the sunbw2 CSR bus cycle handler: */
static int
_tme_sunbw2_bus_cycle_csr(void *_sunbw2, struct tme_bus_cycle *cycle_init)
{
  struct tme_sunbw2 *sunbw2;
  tme_uint16_t csr_old, csr_new;
  tme_bus_addr32_t undecoded;

  /* recover our data structure: */
  sunbw2 = (struct tme_sunbw2 *) _sunbw2;

  /* lock the mutex: */
  tme_mutex_lock(&sunbw2->tme_sunbw2_mutex);

  /* get the old CSR value: */
  csr_old = tme_betoh_u16(sunbw2->tme_sunbw2_csr);

  /* the entire 2KB (one page's) worth of addresses at
     tme_sunbw2_csr_address are all decoded (or, rather, not decoded)
     as the CSR: */
  undecoded
    = (cycle_init->tme_bus_cycle_address
       & (TME_SUNBW2_SIZ_CSR_PAGE - sizeof(sunbw2->tme_sunbw2_csr)));
  cycle_init->tme_bus_cycle_address
    -= undecoded;

  /* run the cycle: */
  assert (cycle_init->tme_bus_cycle_address
	  >= sunbw2->tme_sunbw2_csr_address);
  tme_bus_cycle_xfer_memory(cycle_init, 
			    (((tme_uint8_t *) &sunbw2->tme_sunbw2_csr)
			     - sunbw2->tme_sunbw2_csr_address),
			    (sunbw2->tme_sunbw2_csr_address
			     + sizeof(sunbw2->tme_sunbw2_csr)
			     - 1));
  cycle_init->tme_bus_cycle_address
    += undecoded;

  /* get the new CSR value: */
  csr_new = tme_betoh_u16(sunbw2->tme_sunbw2_csr);

  /* put back the unchanging bits: */
  csr_new
    = ((csr_new
	& ~(TME_SUNBW2_CSR_INT_ACTIVE
	    | TME_SUNBW2_CSR_JUMPER_B
	    | TME_SUNBW2_CSR_JUMPER_A
	    | TME_SUNBW2_CSR_JUMPER_COLOR
	    | TME_SUNBW2_CSR_JUMPER_HIRES))
       | (csr_old
	  & (TME_SUNBW2_CSR_INT_ACTIVE
	     | TME_SUNBW2_CSR_JUMPER_B
	     | TME_SUNBW2_CSR_JUMPER_A
	     | TME_SUNBW2_CSR_JUMPER_COLOR
	     | TME_SUNBW2_CSR_JUMPER_HIRES)));

#if 0//brad
  /* we do not support these bits: */
  if (csr_new
      & (TME_SUNBW2_CSR_ENABLE_COPY
	 | TME_SUNBW2_CSR_ENABLE_INT)) {
    abort();
  }
#else
  if (csr_new & TME_SUNBW2_CSR_ENABLE_COPY) {
	  sunbw2_copy = 1;
	  sunbw2_copy_addr = (csr_new & TME_SUNBW2_CSR_COPYBASE_MASK) << 16;
  } else
	  sunbw2_copy = 0;
#endif

  /* set the new CSR value: */
  sunbw2->tme_sunbw2_csr = tme_htobe_u16(csr_new);

  /* unlock the mutex: */
  tme_mutex_unlock(&sunbw2->tme_sunbw2_mutex);

  /* no faults: */
  return (TME_OK);
}

/* this sets the bwtwo type: */
static const char *
_tme_sunbw2_type_set(struct tme_sunfb *sunfb, const char *bw2_type_string)
{
  struct tme_sunbw2 *sunbw2;
  tme_uint32_t bw2_type;

  /* recover our data structure: */
  sunbw2 = (struct tme_sunbw2 *) sunfb;

  /* see if this is a good type: */
  bw2_type = TME_SUNBW2_TYPE_NULL;
  if (TME_ARG_IS(bw2_type_string, "multibus")) {
    bw2_type = TME_SUNBW2_TYPE_MULTIBUS;
  }
  else if (TME_ARG_IS(bw2_type_string, "old-onboard")) {
    bw2_type = TME_SUNBW2_TYPE_OLD_ONBOARD;
  }
  else if (TME_ARG_IS(bw2_type_string, "onboard")) {
    bw2_type = TME_SUNBW2_TYPE_ONBOARD;
  }
  else if (TME_ARG_IS(bw2_type_string, "P4")) {
    bw2_type = TME_SUNBW2_TYPE_P4;
  }
  else if (TME_ARG_IS(bw2_type_string, "sbus")) {
    bw2_type = TME_SUNBW2_TYPE_SBUS;
  }

  /* set the new type: */
  sunbw2->tme_sunbw2_type = bw2_type;

  /* assume the (relative) bus address of the first byte of displayed
     framebuffer memory is zero: */
  sunbw2->tme_sunbw2_bus_subregion_memory.tme_bus_subregion_address_first = 0;

  /* assume that we can use the unspecified interrupt: */
  sunfb->tme_sunfb_bus_signal_int = TME_BUS_SIGNAL_INT_UNSPEC;

  /* dispatch on the new type: */
  switch (bw2_type) {

    /* if this was a bad type, return a string of types: */
  default: assert(FALSE);
  case TME_SUNBW2_TYPE_NULL:
    return ("multibus | old-onboard | onboard | P4 | sbus");

  case TME_SUNBW2_TYPE_MULTIBUS:
  case TME_SUNBW2_TYPE_OLD_ONBOARD:

    /* set the addresses of the CSR bus subregion: */
    sunbw2->tme_sunbw2_csr_address
      = (bw2_type == TME_SUNBW2_TYPE_MULTIBUS
	 ? TME_SUNBW2_REG_CSR_MULTIBUS
	 : TME_SUNBW2_REG_CSR_OLD_ONBOARD);
    sunbw2->tme_sunbw2_bus_subregion_regs.tme_bus_subregion_address_last
      = (sunbw2->tme_sunbw2_csr_address
	 + TME_SUNBW2_SIZ_CSR_PAGE
	 - 1);

    /* set the CSR bus cycle handler: */
    sunfb->tme_sunfb_bus_handler_regs = _tme_sunbw2_bus_cycle_csr;

    /* the original Multibus bwtwo and onboard bwtwo only support
       1152x900 and 1024x1024: */
    sunfb->tme_sunfb_size
      = (TME_SUNFB_SIZE_1152_900
	 | TME_SUNFB_SIZE_1024_1024);
    break;

  case TME_SUNBW2_TYPE_ONBOARD:

    /* the onboard bwtwo doesn't have any CSR: */
    sunfb->tme_sunfb_bus_handler_regs = NULL;
    
    /* the sizes supported by a CSR-less bwtwo appear to depend on the
       actual model; we assume the user knows what he is doing: */
    sunfb->tme_sunfb_size = (TME_SUNFB_SIZE_NULL - 1);
    break;

  case TME_SUNBW2_TYPE_P4:

    /* set our initial P4 register: */
    sunfb->tme_sunfb_p4 = tme_htobe_u32(TME_SUNFB_P4_ID_BWTWO);

    /* set the P4 register bus cycle handler: */
    sunfb->tme_sunfb_bus_handler_regs = tme_sunfb_bus_cycle_p4;

    /* we support the default P4 framebuffer sizes: */
    sunfb->tme_sunfb_size = 0;

    /* the framebuffer memory begins at a fixed offset after the P4 register: */
    sunbw2->tme_sunbw2_bus_subregion_memory.tme_bus_subregion_address_first
      = TME_SUNFB_P4_OFFSET_BITMAP;

    break;

  case TME_SUNBW2_TYPE_SBUS:

    /* set the S4 register bus cycle handler: */
    sunfb->tme_sunfb_bus_handler_regs = tme_sunfb_bus_cycle_s4;

    /* we support the default S4 framebuffer sizes: */
    sunfb->tme_sunfb_size = 0;

    /* we use the default S4 memory address: */
    sunbw2->tme_sunbw2_bus_subregion_memory.tme_bus_subregion_address_first = 0;

    /* the SBus bwtwo uses priority seven interrupts: */
    sunfb->tme_sunfb_bus_signal_int = TME_BUS_SIGNAL_INT(7);

    break;
  }

  /* success: */
  return (NULL);
}

/* the new sun bwtwo function: */
int
tme_sun_bwtwo(struct tme_element *element, const char * const *args, char **_output)
{
  struct tme_sunbw2 *sunbw2;
  int rc;

  /* start the sunbw2 structure: */
  sunbw2 = tme_new0(struct tme_sunbw2, 1);
  sunbw2->tme_sunbw2_sunfb.tme_sunfb_element = element;

  /* initialize the sunfb structure: */
  sunbw2->tme_sunbw2_sunfb.tme_sunfb_class = TME_FB_XLAT_CLASS_MONOCHROME;
  sunbw2->tme_sunbw2_sunfb.tme_sunfb_depth = 1;
  sunbw2->tme_sunbw2_sunfb.tme_sunfb_type_set = _tme_sunbw2_type_set;

  /* if the generic initialization fails: */
  rc = tme_sunfb_new(&sunbw2->tme_sunbw2_sunfb, args, _output);
  if (rc) {

    /* free the sunfb structure and return the error: */
    tme_free(sunbw2);
    return (rc);
  }

  /* dispatch on the bwtwo type: */
  switch (sunbw2->tme_sunbw2_type) {
  default: break;
  case TME_SUNBW2_TYPE_MULTIBUS:
  case TME_SUNBW2_TYPE_OLD_ONBOARD:

    /* set our initial CSR: */
    sunbw2->tme_sunbw2_csr
      = tme_htobe_u16(TME_SUNBW2_CSR_ENABLE_VIDEO
		      | (sunbw2->tme_sunbw2_sunfb.tme_sunfb_size == TME_SUNFB_SIZE_1024_1024
			 ? TME_SUNBW2_CSR_JUMPER_HIRES
			 : 0));

    break;
  }

  return (TME_OK);
}

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