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-rw-r--r--src/devices/machine/spg2xx.cpp948
1 files changed, 948 insertions, 0 deletions
diff --git a/src/devices/machine/spg2xx.cpp b/src/devices/machine/spg2xx.cpp
new file mode 100644
index 00000000000..d703ffcf98d
--- /dev/null
+++ b/src/devices/machine/spg2xx.cpp
@@ -0,0 +1,948 @@
+// license:BSD-3-Clause
+// copyright-holders:Ryan Holtz
+/*****************************************************************************
+
+ SunPlus SPG2xx-series SoC peripheral emulation
+
+ TODO:
+ - Serial UART
+ - I2C
+ - SPI
+
+**********************************************************************/
+
+#include "spg2xx.h"
+
+DEFINE_DEVICE_TYPE(SPG2XX, spg2xx_device, "spg2xx", "SPG200-series System-on-a-Chip")
+
+#define VERBOSE_LEVEL (4)
+
+#define ENABLE_VERBOSE_LOG (1)
+
+inline void spg2xx_device::verboselog(int n_level, const char *s_fmt, ...)
+{
+#if ENABLE_VERBOSE_LOG
+ if (VERBOSE_LEVEL >= n_level)
+ {
+ va_list v;
+ char buf[32768];
+ va_start(v, s_fmt);
+ vsprintf(buf, s_fmt, v);
+ logerror("%s: %s", machine().describe_context(), buf);
+ va_end(v);
+ }
+#endif
+}
+
+#define SPG_DEBUG_VIDEO (0)
+
+#define IO_IRQ_ENABLE m_io_regs[0x21]
+#define IO_IRQ_STATUS m_io_regs[0x22]
+#define VIDEO_IRQ_ENABLE m_video_regs[0x62]
+#define VIDEO_IRQ_STATUS m_video_regs[0x63]
+
+spg2xx_device::spg2xx_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, SPG2XX, tag, owner, clock)
+ , m_porta_out(*this)
+ , m_portb_out(*this)
+ , m_portc_out(*this)
+ , m_porta_in(*this)
+ , m_portb_in(*this)
+ , m_portc_in(*this)
+ , m_eeprom_w(*this)
+ , m_eeprom_r(*this)
+ , m_uart_tx(*this)
+ , m_uart_rx(*this)
+ , m_cpu(*this, finder_base::DUMMY_TAG)
+ , m_screen(*this, finder_base::DUMMY_TAG)
+ , m_scrollram(*this, "scrollram")
+ , m_paletteram(*this, "paletteram")
+ , m_spriteram(*this, "spriteram")
+{
+}
+
+void spg2xx_device::map(address_map &map)
+{
+ map(0x000000, 0x0027ff).ram();
+ map(0x002800, 0x0028ff).rw(FUNC(spg2xx_device::video_r), FUNC(spg2xx_device::video_w));
+ map(0x002900, 0x002aff).ram().share("scrollram");
+ map(0x002b00, 0x002bff).ram().share("paletteram");
+ map(0x002c00, 0x002fff).ram().share("spriteram");
+ map(0x003000, 0x0037ff).rw(FUNC(spg2xx_device::audio_r), FUNC(spg2xx_device::audio_w));
+ map(0x003d00, 0x003eff).rw(FUNC(spg2xx_device::io_r), FUNC(spg2xx_device::io_w));
+}
+
+void spg2xx_device::device_start()
+{
+ m_porta_out.resolve_safe();
+ m_portb_out.resolve_safe();
+ m_portc_out.resolve_safe();
+ m_porta_in.resolve_safe(0);
+ m_portb_in.resolve_safe(0);
+ m_portc_in.resolve_safe(0);
+ m_eeprom_w.resolve_safe();
+ m_eeprom_r.resolve_safe(0);
+ m_uart_tx.resolve_safe();
+ m_uart_rx.resolve_safe(0);
+
+ m_tmb1 = timer_alloc(TIMER_TMB1);
+ m_tmb2 = timer_alloc(TIMER_TMB2);
+ m_tmb1->adjust(attotime::never);
+ m_tmb2->adjust(attotime::never);
+
+ m_screenpos_timer = timer_alloc(TIMER_SCREENPOS);
+ m_screenpos_timer->adjust(attotime::never);
+}
+
+void spg2xx_device::device_reset()
+{
+ memset(m_video_regs, 0, 0x100 * sizeof(m_video_regs[0]));
+ memset(m_io_regs, 0, 0x200 * sizeof(m_io_regs[0]));
+
+ m_video_regs[0x36] = 0xffff;
+ m_video_regs[0x37] = 0xffff;
+
+ m_hide_page0 = false;
+ m_hide_page1 = false;
+ m_hide_sprites = false;
+ m_debug_sprites = false;
+ m_debug_blit = false;
+ m_sprite_index_to_debug = 0;
+}
+
+
+/*************************
+* Video Hardware *
+*************************/
+
+inline uint8_t spg2xx_device::expand_rgb5_to_rgb8(uint8_t val)
+{
+ uint8_t temp = val & 0x1f;
+ return (temp << 3) | (temp >> 2);
+}
+
+// Perform a lerp between a and b
+inline uint8_t spg2xx_device::mix_channel(uint8_t a, uint8_t b)
+{
+ uint8_t alpha = (m_video_regs[0x2a] & 3) << 6;
+ return ((255 - alpha) * a + alpha * b) / 255;
+}
+
+void spg2xx_device::mix_pixel(uint32_t offset, uint16_t rgb)
+{
+ m_screenbuf[offset].r = mix_channel(m_screenbuf[offset].r, expand_rgb5_to_rgb8(rgb >> 10));
+ m_screenbuf[offset].g = mix_channel(m_screenbuf[offset].g, expand_rgb5_to_rgb8(rgb >> 5));
+ m_screenbuf[offset].b = mix_channel(m_screenbuf[offset].b, expand_rgb5_to_rgb8(rgb));
+}
+
+void spg2xx_device::set_pixel(uint32_t offset, uint16_t rgb)
+{
+ m_screenbuf[offset].r = expand_rgb5_to_rgb8(rgb >> 10);
+ m_screenbuf[offset].g = expand_rgb5_to_rgb8(rgb >> 5);
+ m_screenbuf[offset].b = expand_rgb5_to_rgb8(rgb);
+}
+
+void spg2xx_device::blit(bitmap_rgb32 &bitmap, const rectangle &cliprect, uint32_t xoff, uint32_t yoff, uint32_t attr, uint32_t ctrl, uint32_t bitmap_addr, uint16_t tile)
+{
+ address_space &space = m_cpu->space(AS_PROGRAM);
+
+ uint32_t h = 8 << ((attr & PAGE_TILE_HEIGHT_MASK) >> PAGE_TILE_HEIGHT_SHIFT);
+ uint32_t w = 8 << ((attr & PAGE_TILE_WIDTH_MASK) >> PAGE_TILE_WIDTH_SHIFT);
+
+ uint32_t yflipmask = attr & TILE_Y_FLIP ? h - 1 : 0;
+ uint32_t xflipmask = attr & TILE_X_FLIP ? w - 1 : 0;
+
+ uint32_t nc = ((attr & 0x0003) + 1) << 1;
+
+ uint32_t palette_offset = (attr & 0x0f00) >> 4;
+ if (m_debug_blit && SPG_DEBUG_VIDEO)
+ {
+ printf("xy:%08x,%08x attr:%08x ctrl:%08x bitmap_addr:%08x tile:%04x\n", xoff, yoff, attr, ctrl, bitmap_addr, tile);
+ printf("hw:%d,%d f:%d,%d fm:%d,%d ncols:%d pobs:%02x ", w, h, (attr & TILE_X_FLIP) ? 1 : 0, (attr & TILE_Y_FLIP) ? 1 : 0, xflipmask, yflipmask, nc, palette_offset);
+ }
+ palette_offset >>= nc;
+ palette_offset <<= nc;
+ if (m_debug_blit && SPG_DEBUG_VIDEO)
+ {
+ printf("poas:%02x\n", palette_offset);
+ }
+
+ uint32_t m = bitmap_addr + nc * w*h / 16 * tile;
+ uint32_t bits = 0;
+ uint32_t nbits = 0;
+
+ for (uint32_t y = 0; y < h; y++)
+ {
+ int yy = (yoff + (y ^ yflipmask)) & 0x1ff;
+ if (yy >= 0x01c0)
+ yy -= 0x0200;
+
+ if (m_debug_blit && SPG_DEBUG_VIDEO)
+ printf("%3d:\n", yy);
+
+ for (uint32_t x = 0; x < w; x++)
+ {
+ int xx = xoff + (x ^ xflipmask);
+
+ bits <<= nc;
+ if (m_debug_blit && SPG_DEBUG_VIDEO)
+ printf(" %08x:%d ", bits, nbits);
+ if (nbits < nc)
+ {
+ uint16_t b = space.read_word(m++ & 0x3fffff);
+ b = (b << 8) | (b >> 8);
+ bits |= b << (nc - nbits);
+ nbits += 16;
+ if (m_debug_blit && SPG_DEBUG_VIDEO)
+ printf("(%04x:%08x:%d) ", b, bits, nbits);
+ }
+ nbits -= nc;
+
+ uint32_t pal = palette_offset + (bits >> 16);
+ if (m_debug_blit && SPG_DEBUG_VIDEO)
+ printf("%02x:%02x:%04x ", bits >> 16, pal, bits & 0xffff);
+ bits &= 0xffff;
+
+ if ((ctrl & 0x0010) && yy < 240)
+ xx -= (int16_t)m_scrollram[yy + 15];
+
+ xx &= 0x01ff;
+ if (xx >= 0x01c0)
+ xx -= 0x0200;
+
+ if (xx >= 0 && xx < 320 && yy >= 0 && yy < 240)
+ {
+ uint16_t rgb = m_paletteram[pal];
+ if (m_debug_blit && SPG_DEBUG_VIDEO)
+ printf("rgb:%04x ", rgb);
+ if (!(rgb & 0x8000))
+ {
+ if (attr & 0x4000 || ctrl & 0x0100)
+ {
+ if (m_debug_blit && SPG_DEBUG_VIDEO)
+ printf("M\n");
+ mix_pixel(xx + 320 * yy, rgb);
+ }
+ else
+ {
+ if (m_debug_blit && SPG_DEBUG_VIDEO)
+ printf("S\n");
+ set_pixel(xx + 320 * yy, rgb);
+ }
+ }
+ else if (m_debug_blit && SPG_DEBUG_VIDEO)
+ {
+ printf("X\n");
+ }
+ }
+ }
+ }
+}
+
+void spg2xx_device::blit_page(bitmap_rgb32 &bitmap, const rectangle &cliprect, int depth, uint32_t bitmap_addr, uint16_t *regs)
+{
+ uint32_t xscroll = regs[0];
+ uint32_t yscroll = regs[1];
+ uint32_t attr = regs[2];
+ uint32_t ctrl = regs[3];
+ uint32_t tilemap = regs[4];
+ uint32_t palette_map = regs[5];
+ address_space &space = m_cpu->space(AS_PROGRAM);
+
+ if (!(ctrl & PAGE_ENABLE_MASK))
+ {
+ return;
+ }
+
+ if (((attr & PAGE_DEPTH_FLAG_MASK) >> PAGE_DEPTH_FLAG_SHIFT) != depth)
+ {
+ return;
+ }
+
+ uint32_t h = 8 << ((attr & PAGE_TILE_HEIGHT_MASK) >> PAGE_TILE_HEIGHT_SHIFT);
+ uint32_t w = 8 << ((attr & PAGE_TILE_WIDTH_MASK) >> PAGE_TILE_WIDTH_SHIFT);
+
+ uint32_t hn = 256 / h;
+ uint32_t wn = 512 / w;
+
+ for (uint32_t y0 = 0; y0 < hn; y0++)
+ {
+ for (uint32_t x0 = 0; x0 < wn; x0++)
+ {
+ uint16_t tile = (ctrl & PAGE_BLANK_MASK) ? 0 : space.read_word(tilemap + x0 + wn * y0);
+ uint16_t palette = 0;
+ uint32_t xx, yy;
+
+ if (!tile)
+ {
+ continue;
+ }
+
+ palette = space.read_word(palette_map + (x0 + wn * y0) / 2);
+ if (x0 & 1)
+ {
+ palette >>= 8;
+ }
+
+ uint32_t tileattr = attr;
+ uint32_t tilectrl = ctrl;
+ if ((ctrl & 2) == 0)
+ { // -(1) bld(1) flip(2) pal(4)
+ tileattr &= ~0x000c;
+ tileattr |= (palette >> 2) & 0x000c; // flip
+
+ tileattr &= ~0x0f00;
+ tileattr |= (palette << 8) & 0x0f00; // palette
+
+ tilectrl &= ~0x0100;
+ tilectrl |= (palette << 2) & 0x0100; // blend
+ }
+
+ yy = ((h*y0 - yscroll + 0x10) & 0xff) - 0x10;
+ xx = (w*x0 - xscroll) & 0x1ff;
+
+ blit(bitmap, cliprect, xx, yy, tileattr, tilectrl, bitmap_addr, tile);
+ }
+ }
+}
+
+void spg2xx_device::blit_sprite(bitmap_rgb32 &bitmap, const rectangle &cliprect, int depth, uint32_t base_addr)
+{
+ address_space &space = m_cpu->space(AS_PROGRAM);
+ uint32_t bitmap_addr = 0x40 * m_video_regs[0x22];
+
+ uint16_t tile = space.read_word(base_addr + 0);
+ int16_t x = space.read_word(base_addr + 1);
+ int16_t y = space.read_word(base_addr + 2);
+ uint16_t attr = space.read_word(base_addr + 3);
+
+ if (!tile)
+ {
+ return;
+ }
+
+ if (((attr & PAGE_DEPTH_FLAG_MASK) >> PAGE_DEPTH_FLAG_SHIFT) != depth)
+ {
+ return;
+ }
+
+ if (!(m_video_regs[0x42] & SPRITE_COORD_TL_MASK))
+ {
+ x = 160 + x;
+ y = 120 - y;
+
+ uint32_t h = 8 << ((attr & PAGE_TILE_HEIGHT_MASK) >> PAGE_TILE_HEIGHT_SHIFT);
+ uint32_t w = 8 << ((attr & PAGE_TILE_WIDTH_MASK) >> PAGE_TILE_WIDTH_SHIFT);
+
+ x -= (w / 2);
+ y -= (h / 2) - 8;
+ }
+
+ x &= 0x01ff;
+ y &= 0x01ff;
+
+#if SPG_DEBUG_VIDEO
+ if (m_debug_sprites && machine().input().code_pressed(KEYCODE_MINUS))
+ m_debug_blit = true;
+ blit(bitmap, cliprect, x, y, attr, 0, bitmap_addr, tile);
+ m_debug_blit = false;
+#else
+ blit(bitmap, cliprect, x, y, attr, 0, bitmap_addr, tile);
+#endif
+}
+
+void spg2xx_device::blit_sprites(bitmap_rgb32 &bitmap, const rectangle &cliprect, int depth)
+{
+ if (!(m_video_regs[0x42] & SPRITE_ENABLE_MASK))
+ {
+ return;
+ }
+
+#if SPG_DEBUG_VIDEO
+ if (!m_debug_sprites)
+ {
+#endif
+ for (uint32_t n = 0; n < 256; n++)
+ {
+ blit_sprite(bitmap, cliprect, depth, 0x2c00 + 4 * n);
+ }
+#if SPG_DEBUG_VIDEO
+ }
+ else
+ {
+ blit_sprite(bitmap, cliprect, depth, 0x2c00 + 4 * m_sprite_index_to_debug);
+ }
+#endif
+}
+
+uint32_t spg2xx_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
+{
+ memset(&m_screenbuf[320 * cliprect.min_y], 0, 3 * 320 * ((cliprect.max_y - cliprect.min_y) + 1));
+
+ for (int i = 0; i < 4; i++)
+ {
+ if (!m_hide_page0)
+ blit_page(bitmap, cliprect, i, 0x40 * m_video_regs[0x20], m_video_regs + 0x10);
+ if (!m_hide_page1)
+ blit_page(bitmap, cliprect, i, 0x40 * m_video_regs[0x21], m_video_regs + 0x16);
+ if (!m_hide_sprites)
+ blit_sprites(bitmap, cliprect, i);
+ }
+
+ bitmap.fill(0, cliprect);
+ for (int y = cliprect.min_y; y <= cliprect.max_y; y++)
+ {
+ for (int x = cliprect.min_x; x <= cliprect.max_x; x++)
+ {
+ bitmap.pix32(y, x) = (m_screenbuf[x + 320 * y].r << 16) | (m_screenbuf[x + 320 * y].g << 8) | m_screenbuf[x + 320 * y].b;
+ }
+ }
+
+ return 0;
+}
+
+void spg2xx_device::do_video_dma(uint32_t len)
+{
+ address_space &mem = m_cpu->space(AS_PROGRAM);
+
+ uint32_t src = m_video_regs[0x70] & 0x3fff;
+ uint32_t dst = (m_video_regs[0x71] & 0x3ff) + 0x2c00;
+
+ for (uint32_t j = 0; j < len; j++)
+ {
+ mem.write_word(dst + j, mem.read_word(src + j));
+ }
+
+ m_video_regs[0x72] = 0;
+ VIDEO_IRQ_STATUS |= 4;
+}
+
+READ16_MEMBER(spg2xx_device::video_r)
+{
+ switch (offset)
+ {
+ case 0x38: // Current Line
+ verboselog(3, "video_r: Current Line: %04x\n", m_screen->vpos());
+ return m_screen->vpos();
+
+ case 0x62: // Video IRQ Enable
+ verboselog(0, "video_r: Video IRQ Enable: %04x\n", VIDEO_IRQ_ENABLE);
+ return VIDEO_IRQ_ENABLE;
+
+ case 0x63: // Video IRQ Status
+ verboselog(0, "video_r: Video IRQ Status: %04x\n", VIDEO_IRQ_STATUS);
+ return VIDEO_IRQ_STATUS;
+
+ default:
+ verboselog(0, "video_r: Unknown register %04x = %04x\n", 0x2800 + offset, m_video_regs[offset]);
+ break;
+ }
+ return m_video_regs[offset];
+}
+
+WRITE16_MEMBER(spg2xx_device::video_w)
+{
+ switch (offset)
+ {
+ case 0x10: // Page 1 X scroll
+ verboselog(4, "video_w: Page 1 X Scroll: %04x = %04x\n", 0x2800 | offset, data & 0x01ff);
+ m_video_regs[offset] = data & 0x01ff;
+ break;
+
+ case 0x16: // Page 2 X scroll
+ verboselog(4, "video_w: Page 2 X Scroll: %04x = %04x\n", 0x2800 | offset, data & 0x01ff);
+ m_video_regs[offset] = data & 0x01ff;
+ break;
+
+ case 0x11: // Page 1 Y scroll
+ verboselog(4, "video_w: Page 1 Y Scroll: %04x = %04x\n", 0x2800 | offset, data & 0x00ff);
+ m_video_regs[offset] = data & 0x00ff;
+ break;
+
+ case 0x17: // Page 2 Y scroll
+ verboselog(4, "video_w: Page 2 Y Scroll: %04x = %04x\n", 0x2800 | offset, data & 0x00ff);
+ m_video_regs[offset] = data & 0x00ff;
+ break;
+
+ case 0x36: // IRQ pos V
+ case 0x37: // IRQ pos H
+ m_video_regs[offset] = data & 0x01ff;
+ verboselog(0, "video_w: Video IRQ Position: %04x,%04x (%04x)\n", m_video_regs[0x37], m_video_regs[0x36], 0x2800 | offset);
+ if (m_video_regs[0x37] < 160 && m_video_regs[0x36] < 240)
+ m_screenpos_timer->adjust(m_screen->time_until_pos(m_video_regs[0x36], m_video_regs[0x37] << 1));
+ else
+ m_screenpos_timer->adjust(attotime::never);
+ break;
+
+ case 0x62: // Video IRQ Enable
+ {
+ verboselog(0, "video_w: Video IRQ Enable = %04x (%04x)\n", data, mem_mask);
+ const uint16_t old = VIDEO_IRQ_ENABLE & VIDEO_IRQ_STATUS;
+ COMBINE_DATA(&VIDEO_IRQ_ENABLE);
+ const uint16_t changed = old ^ (VIDEO_IRQ_ENABLE & VIDEO_IRQ_STATUS);
+ if (changed)
+ check_video_irq();
+ break;
+ }
+
+ case 0x63: // Video IRQ Acknowledge
+ {
+ verboselog(0, "video_w: Video IRQ Acknowledge = %04x (%04x)\n", data, mem_mask);
+ const uint16_t old = VIDEO_IRQ_ENABLE & VIDEO_IRQ_STATUS;
+ VIDEO_IRQ_STATUS &= ~data;
+ verboselog(4, "Setting video IRQ status to %04x\n", VIDEO_IRQ_STATUS);
+ const uint16_t changed = old ^ (VIDEO_IRQ_ENABLE & VIDEO_IRQ_STATUS);
+ if (changed)
+ check_video_irq();
+ break;
+ }
+
+ case 0x70: // Video DMA Source
+ verboselog(0, "video_w: Video DMA Source = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_video_regs[offset]);
+ break;
+
+ case 0x71: // Video DMA Dest
+ verboselog(0, "video_w: Video DMA Dest = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_video_regs[offset]);
+ break;
+
+ case 0x72: // Video DMA Length
+ verboselog(0, "video_w: Video DMA Length = %04x (%04x)\n", data, mem_mask);
+ do_video_dma(data & 0x3ff);
+ break;
+
+ default:
+ verboselog(0, "video_w: Unknown register %04x = %04x (%04x)\n", 0x2800 + offset, data, mem_mask);
+ COMBINE_DATA(&m_video_regs[offset]);
+ break;
+ }
+}
+
+WRITE_LINE_MEMBER(spg2xx_device::vblank)
+{
+ if (!state)
+ return;
+
+#if SPG_DEBUG_VIDEO
+ if (machine().input().code_pressed_once(KEYCODE_5))
+ m_hide_page0 = !m_hide_page0;
+ if (machine().input().code_pressed_once(KEYCODE_6))
+ m_hide_page1 = !m_hide_page1;
+ if (machine().input().code_pressed_once(KEYCODE_7))
+ m_hide_sprites = !m_hide_sprites;
+ if (machine().input().code_pressed_once(KEYCODE_8))
+ m_debug_sprites = !m_debug_sprites;
+ if (machine().input().code_pressed_once(KEYCODE_9))
+ m_sprite_index_to_debug--;
+ if (machine().input().code_pressed_once(KEYCODE_0))
+ m_sprite_index_to_debug++;
+#endif
+
+ const uint16_t old = VIDEO_IRQ_ENABLE & VIDEO_IRQ_STATUS;
+ VIDEO_IRQ_STATUS |= 1;
+ verboselog(4, "Setting video IRQ status to %04x\n", VIDEO_IRQ_STATUS);
+ const uint16_t changed = old ^ (VIDEO_IRQ_ENABLE & VIDEO_IRQ_STATUS);
+ if (changed)
+ check_video_irq();
+
+ // For now, manually trigger controller IRQs
+ if (IO_IRQ_ENABLE & 0x2100)
+ {
+ IO_IRQ_STATUS |= 0x0100;
+ m_cpu->set_input_line(UNSP_IRQ3_LINE, ASSERT_LINE);
+ }
+}
+
+void spg2xx_device::check_video_irq()
+{
+ m_cpu->set_input_line(UNSP_IRQ0_LINE, (VIDEO_IRQ_STATUS & VIDEO_IRQ_ENABLE) ? ASSERT_LINE : CLEAR_LINE);
+}
+
+
+/*************************
+* Machine Hardware *
+*************************/
+
+READ16_MEMBER(spg2xx_device::audio_r)
+{
+ switch (offset)
+ {
+ default:
+ verboselog(4, "audio_r: Unknown register %04x\n", 0x3000 + offset);
+ break;
+ }
+ return 0;
+}
+
+WRITE16_MEMBER(spg2xx_device::audio_w)
+{
+ switch (offset)
+ {
+ default:
+ verboselog(5, "audio_w: Unknown register %04x = %04x (%04x)\n", 0x3000 + offset, data, mem_mask);
+ break;
+ }
+}
+
+READ16_MEMBER(spg2xx_device::io_r)
+{
+ static const char *const gpioregs[] = { "GPIO Data Port", "GPIO Buffer Port", "GPIO Direction Port", "GPIO Attribute Port", "GPIO IRQ/Latch Port" };
+ static const char gpioports[] = { 'A', 'B', 'C' };
+
+ uint16_t val = m_io_regs[offset];
+
+ switch (offset)
+ {
+ case 0x01: case 0x06: case 0x0b: // GPIO Data Port A/B/C
+ do_gpio(offset);
+ verboselog(3, "io_r: %s %c = %04x (%04x)\n", gpioregs[(offset - 1) % 5], gpioports[(offset - 1) / 5], m_io_regs[offset], mem_mask);
+ val = m_io_regs[offset];
+ break;
+
+ case 0x02: case 0x03: case 0x04: case 0x05:
+ case 0x07: case 0x08: case 0x09: case 0x0a:
+ case 0x0c: case 0x0d: case 0x0e: case 0x0f: // Other GPIO regs
+ verboselog(3, "io_r: %s %c = %04x (%04x)\n", gpioregs[(offset - 1) % 5], gpioports[(offset - 1) / 5], m_io_regs[offset], mem_mask);
+ break;
+
+ case 0x1c: // Video line counter
+ val = m_screen->vpos();
+ verboselog(3, "io_r: Video Line = %04x (%04x)\n", val, mem_mask);
+ break;
+
+ case 0x21: // IRQ Control
+ verboselog(3, "io_r: Controller IRQ Control = %04x (%04x)\n", val, mem_mask);
+ break;
+
+ case 0x22: // IRQ Status
+ verboselog(3, "io_r: Controller IRQ Status = %04x (%04x)\n", val, mem_mask);
+ break;
+
+ case 0x2b:
+ return 0x0000;
+
+ case 0x2c: case 0x2d: // PRNG 0/1
+ val = machine().rand() & 0x0000ffff;
+ verboselog(3, "io_r: PRNG %d = %04x (%04x)\n", offset - 0x2c, val, mem_mask);
+ break;
+
+ case 0x2f: // Data Segment
+ val = m_cpu->state_int(UNSP_SR) >> 10;
+ verboselog(3, "io_r: Data Segment = %04x (%04x)\n", val, mem_mask);
+ break;
+
+ case 0x31: // UART Status
+ verboselog(3, "io_r: UART Status = %04x (%04x)\n", 3, mem_mask);
+ val = 3; // HACK
+ break;
+
+ case 0x36: // UART RX Data
+ val = m_uart_rx();
+ verboselog(3, "io_r: UART RX Data = %04x (%04x)\n", val, mem_mask);
+ break;
+
+ case 0x59: // I2C Status
+ verboselog(3, "io_r: I2C Status = %04x (%04x)\n", val, mem_mask);
+ break;
+
+ case 0x5e: // I2C Data In
+ verboselog(3, "io_r: I2C Data In = %04x (%04x)\n", val, mem_mask);
+ break;
+
+ default:
+ verboselog(3, "io_r: Unknown register %04x\n", 0x3d00 + offset);
+ break;
+ }
+
+ return val;
+}
+
+WRITE16_MEMBER(spg2xx_device::io_w)
+{
+ static const char *const gpioregs[] = { "GPIO Data Port", "GPIO Buffer Port", "GPIO Direction Port", "GPIO Attribute Port", "GPIO IRQ/Latch Port" };
+ static const char gpioports[3] = { 'A', 'B', 'C' };
+
+ uint16_t temp = 0;
+
+ switch (offset)
+ {
+ case 0x00: // GPIO special function select
+ verboselog(3, "io_w: GPIO Function Select = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x01: case 0x06: case 0x0b: // GPIO data, port A/B/C
+ offset++;
+ // Intentional fallthrough - we redirect data register writes to the buffer register.
+
+ case 0x02: case 0x03: case 0x04: case 0x05: // Port A
+ case 0x07: case 0x08: case 0x09: case 0x0a: // Port B
+ case 0x0c: case 0x0d: case 0x0e: case 0x0f: // Port C
+ verboselog(3, "io_w: %s %c = %04x (%04x)\n", gpioregs[(offset - 1) % 5], gpioports[(offset - 1) / 5], data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ do_gpio(offset);
+ break;
+
+ case 0x10: // timebase control
+ if ((m_io_regs[offset] & 0x0003) != (data & 0x0003))
+ {
+ uint16_t hz = 8 << (data & 0x0003);
+ verboselog(3, "*** TMB1 FREQ set to %dHz\n", hz);
+ m_tmb1->adjust(attotime::from_hz(hz), 0, attotime::from_hz(hz));
+ }
+ if ((m_io_regs[offset] & 0x000c) != (data & 0x000c))
+ {
+ uint16_t hz = 128 << ((data & 0x000c) >> 2);
+ verboselog(3, "*** TMB2 FREQ set to %dHz\n", hz);
+ m_tmb2->adjust(attotime::from_hz(hz), 0, attotime::from_hz(hz));
+ }
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x21: // IRQ Enable
+ {
+ verboselog(3, "io_w: IRQ Control = %04x (%04x)\n", data, mem_mask);
+ const uint16_t old = IO_IRQ_ENABLE & IO_IRQ_STATUS;
+ COMBINE_DATA(&IO_IRQ_ENABLE);
+ const uint16_t changed = old ^ (IO_IRQ_ENABLE & IO_IRQ_STATUS);
+ if (changed)
+ check_irqs(changed);
+ break;
+ }
+
+ case 0x22: // IRQ Acknowledge
+ {
+ verboselog(3, "io_w: IRQ Acknowledge = %04x (%04x)\n", data, mem_mask);
+ const uint16_t old = IO_IRQ_STATUS;
+ IO_IRQ_STATUS &= ~data;
+ const uint16_t changed = old ^ (IO_IRQ_ENABLE & IO_IRQ_STATUS);
+ if (changed)
+ check_irqs(changed);
+ break;
+ }
+
+ case 0x2f: // Data Segment
+ temp = m_cpu->state_int(UNSP_SR);
+ m_cpu->set_state_int(UNSP_SR, (temp & 0x03ff) | ((data & 0x3f) << 10));
+ verboselog(3, "io_w: Data Segment = %04x (%04x)\n", data, mem_mask);
+ break;
+
+ case 0x31: // Unknown UART
+ verboselog(3, "io_w: Unknown UART = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x32: // UART Reset
+ verboselog(3, "io_w: UART Reset\n");
+ break;
+
+ case 0x33: // UART Baud Rate
+ verboselog(3, "io_w: UART Baud Rate = %u\n", 27000000 / 16 / (0x10000 - (m_io_regs[0x34] << 8) - data));
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x35: // UART TX Data
+ verboselog(3, "io_w: UART Baud Rate = %u\n", 27000000 / 16 / (0x10000 - (data << 8) - m_io_regs[0x33]));
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x58: // I2C Command
+ verboselog(3, "io_w: I2C Command = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ do_i2c();
+ break;
+
+ case 0x59: // I2C Status / Acknowledge
+ verboselog(3, "io_w: I2C Acknowledge = %04x (%04x)\n", data, mem_mask);
+ m_io_regs[offset] &= ~data;
+ break;
+
+ case 0x5a: // I2C Access Mode
+ verboselog(3, "io_w: I2C Access Mode = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x5b: // I2C Device Address
+ verboselog(3, "io_w: I2C Device Address = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x5c: // I2C Sub-Address
+ verboselog(3, "io_w: I2C Sub-Address = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x5d: // I2C Data Out
+ verboselog(3, "io_w: I2C Data Out = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x5e: // I2C Data In
+ verboselog(3, "io_w: I2C Data In = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x5f: // I2C Controller Mode
+ verboselog(3, "io_w: I2C Controller Mode = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x100: // DMA Source (L)
+ verboselog(3, "io_w: DMA Source (L) 3e00 = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x101: // DMA Source (H)
+ verboselog(3, "io_w: DMA Source (H) 3e01 = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x103: // DMA Destination
+ verboselog(3, "io_w: DMA Dest 3e03 = %04x (%04x)\n", data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+
+ case 0x102: // DMA Length
+ verboselog(3, "io_w: DMA Length 3e02 = %04x (%04x)\n", data, mem_mask);
+ do_cpu_dma(data);
+ break;
+
+ default:
+ verboselog(3, "io_w: Unknown register %04x = %04x (%04x)\n", 0x3d00 + offset, data, mem_mask);
+ COMBINE_DATA(&m_io_regs[offset]);
+ break;
+ }
+}
+
+void spg2xx_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+ switch (id)
+ {
+ case TIMER_TMB1:
+ {
+ const uint16_t old = (IO_IRQ_ENABLE & IO_IRQ_STATUS);
+ IO_IRQ_STATUS |= 1;
+ const uint16_t changed = old ^ (IO_IRQ_ENABLE & IO_IRQ_STATUS);
+ if (changed)
+ check_irqs(changed);
+ break;
+ }
+ case TIMER_TMB2:
+ {
+ const uint16_t old = m_io_regs[0x22] & m_io_regs[0x21];
+ IO_IRQ_STATUS |= 2;
+ const uint16_t changed = old ^ (IO_IRQ_ENABLE & IO_IRQ_STATUS);
+ if (changed)
+ check_irqs(changed);
+ break;
+ }
+ case TIMER_SCREENPOS:
+ {
+ const uint16_t old = VIDEO_IRQ_ENABLE & VIDEO_IRQ_STATUS;
+ VIDEO_IRQ_STATUS |= 2;
+ const uint16_t changed = old ^ (VIDEO_IRQ_ENABLE & VIDEO_IRQ_STATUS);
+ if (changed)
+ {
+ check_video_irq();
+ }
+ m_screen->update_partial(m_screen->vpos());
+ break;
+ }
+ }
+}
+
+void spg2xx_device::check_irqs(const uint16_t changed)
+{
+ // {
+ // verboselog(0, "audio 1 IRQ\n");
+ // m_cpu->set_input_line(UNSP_IRQ1_LINE, ASSERT_LINE);
+ // }
+ if (changed & 0x0c00) // Timer A, Timer B IRQ
+ {
+ m_cpu->set_input_line(UNSP_IRQ2_LINE, (IO_IRQ_ENABLE & IO_IRQ_STATUS & 0x0c00) ? ASSERT_LINE : CLEAR_LINE);
+ }
+
+ if (changed & 0x2100) // UART, ADC IRQ
+ m_cpu->set_input_line(UNSP_IRQ3_LINE, (IO_IRQ_ENABLE & IO_IRQ_STATUS & 0x2100) ? ASSERT_LINE : CLEAR_LINE);
+
+ // {
+ // verboselog(0, "audio 4 IRQ\n");
+ // m_cpu->set_input_line(UNSP_IRQ4_LINE, ASSERT_LINE);
+ // }
+
+ if (changed & 0x1200) // External IRQ
+ {
+ m_cpu->set_input_line(UNSP_IRQ5_LINE, (IO_IRQ_ENABLE & IO_IRQ_STATUS & 0x1200) ? ASSERT_LINE : CLEAR_LINE);
+ }
+
+ if (changed & 0x0070) // 1024Hz, 2048Hz, 4096Hz IRQ
+ {
+ m_cpu->set_input_line(UNSP_IRQ6_LINE, (IO_IRQ_ENABLE & IO_IRQ_STATUS & 0x0070) ? ASSERT_LINE : CLEAR_LINE);
+ }
+
+ if (changed & 0x008b) // TMB1, TMB2, 4Hz, key change IRQ
+ {
+ m_cpu->set_input_line(UNSP_IRQ7_LINE, (IO_IRQ_ENABLE & IO_IRQ_STATUS & 0x008b) ? ASSERT_LINE : CLEAR_LINE);
+ }
+}
+
+void spg2xx_device::do_gpio(uint32_t offset)
+{
+ uint32_t index = (offset - 1) / 5;
+ uint16_t buffer = m_io_regs[5 * index + 2];
+ uint16_t dir = m_io_regs[5 * index + 3];
+ uint16_t attr = m_io_regs[5 * index + 4];
+ uint16_t special = m_io_regs[5 * index + 5];
+
+ uint16_t push = dir;
+ uint16_t pull = (~dir) & (~attr);
+ uint16_t what = (buffer & (push | pull));
+ what ^= (dir & ~attr);
+ what &= ~special;
+
+ switch (index)
+ {
+ case 0:
+ m_porta_out(what);
+ what = (what & ~pull) | (m_porta_in() & pull);
+ break;
+ case 1:
+ m_portb_out(what);
+ what = (what & ~pull) | (m_portb_in() & pull);
+ break;
+ case 2:
+ m_portc_out(what);
+ what = (what & ~pull) | (m_portc_in() & pull);
+ break;
+ }
+
+ m_io_regs[5 * index + 1] = what;
+}
+
+void spg2xx_device::do_i2c()
+{
+ const uint16_t addr = ((m_io_regs[0x5b] & 0x06) << 7) | (uint8_t)m_io_regs[0x5c];
+
+ if (m_io_regs[0x58] & 0x40) // Serial EEPROM read
+ m_io_regs[0x5e] = m_eeprom_r(addr);
+ else
+ m_eeprom_w(addr, m_io_regs[0x5d]);
+
+ m_io_regs[0x59] |= 1;
+}
+
+void spg2xx_device::do_cpu_dma(uint32_t len)
+{
+ address_space &mem = m_cpu->space(AS_PROGRAM);
+
+ uint32_t src = ((m_io_regs[0x101] & 0x3f) << 16) | m_io_regs[0x100];
+ uint32_t dst = m_io_regs[0x103] & 0x3fff;
+
+ for (uint32_t j = 0; j < len; j++)
+ {
+ mem.write_word(dst + j, mem.read_word(src + j));
+ }
+
+ m_io_regs[0x102] = 0;
+}