sim: bfin: new GPIO model

Newer BF54x parts feature an updated GPIO block, so create a new
model for it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 284 insertions, 0 deletions

diff --git a/sim/bfin/dv-bfin_gpio2.c b/sim/bfin/dv-bfin_gpio2.c
new file mode 100644
index 0000000..0e8787e
--- /dev/null
+++ b/sim/bfin/dv-bfin_gpio2.c
@@ -0,0 +1,284 @@
+/* Blackfin General Purpose Ports (GPIO) model
+   For "new style" GPIOs on BF54x parts.
+
+   Copyright (C) 2010-2012 Free Software Foundation, Inc.
+   Contributed by Analog Devices, Inc. and Mike Frysinger.
+
+   This file is part of simulators.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+
+#include "sim-main.h"
+#include "devices.h"
+#include "dv-bfin_gpio2.h"
+
+struct bfin_gpio
+{
+  bu32 base;
+
+  /* Only accessed indirectly via dir_{set,clear}.  */
+  bu16 dir;
+
+  /* Make sure hardware MMRs are aligned.  */
+  bu16 _pad;
+
+  /* Order after here is important -- matches hardware MMR layout.  */
+  bu16 BFIN_MMR_16(fer);
+  bu16 BFIN_MMR_16(data);
+  bu16 BFIN_MMR_16(set);
+  bu16 BFIN_MMR_16(clear);
+  bu16 BFIN_MMR_16(dir_set);
+  bu16 BFIN_MMR_16(dir_clear);
+  bu16 BFIN_MMR_16(inen);
+  bu32 mux;
+};
+#define mmr_base()      offsetof(struct bfin_gpio, fer)
+#define mmr_offset(mmr) (offsetof(struct bfin_gpio, mmr) - mmr_base())
+
+static const char * const mmr_names[] =
+{
+  "PORTIO_FER", "PORTIO", "PORTIO_SET", "PORTIO_CLEAR", "PORTIO_DIR_SET",
+  "PORTIO_DIR_CLEAR", "PORTIO_INEN", "PORTIO_MUX",
+};
+#define mmr_name(off) mmr_names[(off) / 4]
+
+static unsigned
+bfin_gpio_io_write_buffer (struct hw *me, const void *source, int space,
+			   address_word addr, unsigned nr_bytes)
+{
+  struct bfin_gpio *port = hw_data (me);
+  bu32 mmr_off;
+  bu32 value;
+  bu16 *value16p;
+  bu32 *value32p;
+  void *valuep;
+
+  if (nr_bytes == 4)
+    value = dv_load_4 (source);
+  else
+    value = dv_load_2 (source);
+  mmr_off = addr - port->base;
+  valuep = (void *)((unsigned long)port + mmr_base() + mmr_off);
+  value16p = valuep;
+  value32p = valuep;
+
+  HW_TRACE_WRITE ();
+
+  if (mmr_off == mmr_offset (mux))
+    dv_bfin_mmr_require_32 (me, addr, nr_bytes, true);
+  else
+    dv_bfin_mmr_require_16 (me, addr, nr_bytes, true);
+
+  switch (mmr_off)
+    {
+    case mmr_offset(fer):
+    case mmr_offset(data):
+    case mmr_offset(inen):
+      *value16p = value;
+      break;
+    case mmr_offset(clear):
+      /* We want to clear the related data MMR.  */
+      dv_w1c_2 (&port->data, value, -1);
+      break;
+    case mmr_offset(set):
+      /* We want to set the related data MMR.  */
+      port->data |= value;
+      break;
+    case mmr_offset(dir_clear):
+      dv_w1c_2 (&port->dir, value, -1);
+      break;
+    case mmr_offset(dir_set):
+      port->dir |= value;
+      break;
+    case mmr_offset(mux):
+      *value32p = value;
+      break;
+    default:
+      dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
+      break;
+    }
+
+  /* If tweaking output pins, make sure we send updated port info.  */
+  switch (mmr_off)
+    {
+    case mmr_offset(data):
+    case mmr_offset(set):
+    case mmr_offset(clear):
+    case mmr_offset(dir_set):
+      {
+	int i;
+	bu32 bit;
+
+	for (i = 0; i < 16; ++i)
+	  {
+	    bit = (1 << i);
+
+	    if (!(port->inen & bit))
+	      hw_port_event (me, i, !!(port->data & bit));
+	  }
+
+	break;
+      }
+    }
+
+  return nr_bytes;
+}
+
+static unsigned
+bfin_gpio_io_read_buffer (struct hw *me, void *dest, int space,
+			  address_word addr, unsigned nr_bytes)
+{
+  struct bfin_gpio *port = hw_data (me);
+  bu32 mmr_off;
+  bu16 *value16p;
+  bu32 *value32p;
+  void *valuep;
+
+  mmr_off = addr - port->base;
+  valuep = (void *)((unsigned long)port + mmr_base() + mmr_off);
+  value16p = valuep;
+  value32p = valuep;
+
+  HW_TRACE_READ ();
+
+  if (mmr_off == mmr_offset (mux))
+    dv_bfin_mmr_require_32 (me, addr, nr_bytes, false);
+  else
+    dv_bfin_mmr_require_16 (me, addr, nr_bytes, false);
+
+  switch (mmr_off)
+    {
+    case mmr_offset(data):
+    case mmr_offset(clear):
+    case mmr_offset(set):
+      dv_store_2 (dest, port->data);
+      break;
+    case mmr_offset(dir_clear):
+    case mmr_offset(dir_set):
+      dv_store_2 (dest, port->dir);
+      break;
+    case mmr_offset(fer):
+    case mmr_offset(inen):
+      dv_store_2 (dest, *value16p);
+      break;
+    case mmr_offset(mux):
+      dv_store_4 (dest, *value32p);
+      break;
+    default:
+      dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
+      break;
+    }
+
+  return nr_bytes;
+}
+
+static const struct hw_port_descriptor bfin_gpio_ports[] =
+{
+  { "p0",     0, 0, bidirect_port, },
+  { "p1",     1, 0, bidirect_port, },
+  { "p2",     2, 0, bidirect_port, },
+  { "p3",     3, 0, bidirect_port, },
+  { "p4",     4, 0, bidirect_port, },
+  { "p5",     5, 0, bidirect_port, },
+  { "p6",     6, 0, bidirect_port, },
+  { "p7",     7, 0, bidirect_port, },
+  { "p8",     8, 0, bidirect_port, },
+  { "p9",     9, 0, bidirect_port, },
+  { "p10",   10, 0, bidirect_port, },
+  { "p11",   11, 0, bidirect_port, },
+  { "p12",   12, 0, bidirect_port, },
+  { "p13",   13, 0, bidirect_port, },
+  { "p14",   14, 0, bidirect_port, },
+  { "p15",   15, 0, bidirect_port, },
+  { NULL, 0, 0, 0, },
+};
+
+static void
+bfin_gpio_port_event (struct hw *me, int my_port, struct hw *source,
+		      int source_port, int level)
+{
+  struct bfin_gpio *port = hw_data (me);
+  bu32 bit = (1 << my_port);
+
+  /* Normalize the level value.  A simulated device can send any value
+     it likes to us, but in reality we only care about 0 and 1.  This
+     lets us assume only those two values below.  */
+  level = !!level;
+
+  HW_TRACE ((me, "pin %i set to %i", my_port, level));
+
+  /* Only screw with state if this pin is set as an input, and the
+     input is actually enabled, and it isn't in peripheral mode.  */
+  if ((port->dir & bit) || !(port->inen & bit) || !(port->fer & bit))
+    {
+      HW_TRACE ((me, "ignoring level due to DIR=%i INEN=%i FER=%i",
+		 !!(port->dir & bit), !!(port->inen & bit),
+		 !!(port->fer & bit)));
+      return;
+    }
+
+  hw_port_event (me, my_port, level);
+}
+
+static void
+attach_bfin_gpio_regs (struct hw *me, struct bfin_gpio *port)
+{
+  address_word attach_address;
+  int attach_space;
+  unsigned attach_size;
+  reg_property_spec reg;
+
+  if (hw_find_property (me, "reg") == NULL)
+    hw_abort (me, "Missing \"reg\" property");
+
+  if (!hw_find_reg_array_property (me, "reg", 0, &reg))
+    hw_abort (me, "\"reg\" property must contain three addr/size entries");
+
+  hw_unit_address_to_attach_address (hw_parent (me),
+				     &reg.address,
+				     &attach_space, &attach_address, me);
+  hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
+
+  if (attach_size != BFIN_MMR_GPIO2_SIZE)
+    hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_GPIO2_SIZE);
+
+  hw_attach_address (hw_parent (me),
+		     0, attach_space, attach_address, attach_size, me);
+
+  port->base = attach_address;
+}
+
+static void
+bfin_gpio_finish (struct hw *me)
+{
+  struct bfin_gpio *port;
+
+  port = HW_ZALLOC (me, struct bfin_gpio);
+
+  set_hw_data (me, port);
+  set_hw_io_read_buffer (me, bfin_gpio_io_read_buffer);
+  set_hw_io_write_buffer (me, bfin_gpio_io_write_buffer);
+  set_hw_ports (me, bfin_gpio_ports);
+  set_hw_port_event (me, bfin_gpio_port_event);
+
+  attach_bfin_gpio_regs (me, port);
+}
+
+const struct hw_descriptor dv_bfin_gpio2_descriptor[] =
+{
+  {"bfin_gpio2", bfin_gpio_finish,},
+  {NULL, NULL},
+};