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+/* This file is part of the program psim.
+
+ Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
+
+ 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 2 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, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ */
+
+
+#ifndef _HW_GLUE_C_
+#define _HW_GLUE_C_
+
+#include "device_table.h"
+
+
+/* DEVICE
+
+
+ glue - glue to interconnect and test interrupts
+
+
+ DESCRIPTION
+
+
+ The glue device provides two functions. Firstly, it provides a
+ mechanism for inspecting and driving the interrupt net. Secondly,
+ it provides a set of boolean primitives that can be used add
+ combinatorial operations to the interrupt network.
+
+ Glue devices have a variable number of big endian <<output>>
+ registers. Each host-word size. The registers can be both read
+ and written.
+
+ Writing a value to an output register causes an interrupt (of the
+ specified level) to be driven on the devices corresponding output
+ interrupt port.
+
+ Reading an <<output>> register returns either the last value
+ written or the most recently computed value (for that register) as
+ a result of an interrupt ariving (which ever was computed last).
+
+ At present the following sub device types are available:
+
+ <<glue>>: In addition to driving its output interrupt port with any
+ value written to an interrupt input port is stored in the
+ corresponding <<output>> register. Such input interrupts, however,
+ are not propogated to an output interrupt port.
+
+ <<glue-and>>: The bit-wise AND of the interrupt inputs is computed
+ and then both stored in <<output>> register zero and propogated to
+ output interrupt output port zero.
+
+
+ PROPERTIES
+
+
+ reg = <address> <size> (required)
+
+ Specify the address (within the parent bus) that this device is to
+ live. The address must be 2048 * sizeof(word) (8k in a 32bit
+ simulation) aligned.
+
+
+ interrupt-ranges = <int-number> <range> (optional)
+
+ If present, this specifies the number of valid interrupt inputs (up
+ to the maximum of 2048). By default, <<int-number>> is zero and
+ range is determined by the <<reg>> size.
+
+
+ EXAMPLES
+
+
+ Enable tracing of the device:
+
+ | -t glue-device \
+
+
+ Create source, bitwize-and, and sink glue devices. Since the
+ device at address <<0x10000>> is of size <<8>> it will have two
+ output interrupt ports.
+
+ | -o '/iobus@0xf0000000/glue@0x10000/reg 0x10000 8' \
+ | -o '/iobus@0xf0000000/glue-and@0x20000/reg 0x20000 4' \
+ | -o '/iobus@0xf0000000/glue-and/interrupt-ranges 0 2' \
+ | -o '/iobus@0xf0000000/glue@0x30000/reg 0x30000 4' \
+
+
+ Wire the two source interrupts to the AND device:
+
+ | -o '/iobus@0xf0000000/glue@0x10000 > 0 0 /iobus/glue-and' \
+ | -o '/iobus@0xf0000000/glue@0x10000 > 1 1 /iobus/glue-and' \
+
+
+ Wire the AND device up to the sink so that the and's output is not
+ left open.
+
+ | -o '/iobus@0xf0000000/glue-and > 0 0 /iobus/glue@0x30000' \
+
+
+ With the above configuration. The client program is able to
+ compute a two bit AND. For instance the <<C>> stub below prints 1
+ AND 0.
+
+ | unsigned *input = (void*)0xf0010000;
+ | unsigned *output = (void*)0xf0030000;
+ | unsigned ans;
+ | input[0] = htonl(1);
+ | input[1] = htonl(0);
+ | ans = ntohl(*output);
+ | write_string("AND is ");
+ | write_int(ans);
+ | write_line();
+
+
+ BUGS
+
+
+ A future implementation of this device may support multiple
+ interrupt ranges.
+
+ Some of the devices listed may not yet be fully implemented.
+
+ Additional devices such as a dff, an inverter or a latch may be
+ useful.
+
+ */
+
+
+enum {
+ max_nr_interrupts = 2048,
+};
+
+typedef enum _hw_glue_type {
+ glue_undefined = 0,
+ glue_io,
+ glue_and,
+ glue_nand,
+ glue_or,
+ glue_xor,
+ glue_nor,
+ glue_not,
+} hw_glue_type;
+
+typedef struct _hw_glue_device {
+ hw_glue_type type;
+ int int_number;
+ int *input;
+ int nr_inputs;
+ unsigned sizeof_input;
+ /* our output registers */
+ int space;
+ unsigned_word address;
+ unsigned sizeof_output;
+ int *output;
+ int nr_outputs;
+} hw_glue_device;
+
+
+static void
+hw_glue_init_address(device *me)
+{
+ hw_glue_device *glue = (hw_glue_device*)device_data(me);
+
+ /* attach to my parent */
+ generic_device_init_address(me);
+
+ /* establish the output registers */
+ if (glue->output != NULL) {
+ memset(glue->output, 0, glue->sizeof_output);
+ }
+ else {
+ reg_property_spec unit;
+ int reg_nr;
+ /* find a relevant reg entry */
+ reg_nr = 0;
+ while (device_find_reg_array_property(me, "reg", reg_nr, &unit)
+ && !device_size_to_attach_size(device_parent(me), &unit.size,
+ &glue->sizeof_output, me))
+ reg_nr++;
+ /* check out the size */
+ if (glue->sizeof_output == 0)
+ device_error(me, "at least one reg property size must be nonzero");
+ if (glue->sizeof_output % sizeof(unsigned_word) != 0)
+ device_error(me, "reg property size must be %d aligned", sizeof(unsigned_word));
+ /* and the address */
+ device_address_to_attach_address(device_parent(me),
+ &unit.address, &glue->space, &glue->address,
+ me);
+ if (glue->address % (sizeof(unsigned_word) * max_nr_interrupts) != 0)
+ device_error(me, "reg property address must be %d aligned",
+ sizeof(unsigned_word) * max_nr_interrupts);
+ glue->nr_outputs = glue->sizeof_output / sizeof(unsigned_word);
+ glue->output = zalloc(glue->sizeof_output);
+ }
+
+ /* establish the input interrupt ports */
+ if (glue->input != NULL) {
+ memset(glue->input, 0, glue->sizeof_input);
+ }
+ else {
+ const device_property *ranges = device_find_property(me, "interrupt-ranges");
+ if (ranges == NULL) {
+ glue->int_number = 0;
+ glue->nr_inputs = glue->nr_outputs;
+ }
+ else if (ranges->sizeof_array != sizeof(unsigned_cell) * 2) {
+ device_error(me, "invalid interrupt-ranges property (incorrect size)");
+ }
+ else {
+ const unsigned_cell *int_range = ranges->array;
+ glue->int_number = BE2H_cell(int_range[0]);
+ glue->nr_inputs = BE2H_cell(int_range[1]);
+ }
+ glue->sizeof_input = glue->nr_inputs * sizeof(unsigned);
+ glue->input = zalloc(glue->sizeof_input);
+ }
+
+ /* determine our type */
+ if (glue->type == glue_undefined) {
+ const char *name = device_name(me);
+ if (strcmp(name, "glue") == 0)
+ glue->type = glue_io;
+ else if (strcmp(name, "glue-and") == 0)
+ glue->type = glue_and;
+ else
+ device_error(me, "unimplemented glue type");
+ }
+
+ DTRACE(glue, ("int-number %d, nr_inputs %d, nr_outputs %d\n",
+ glue->int_number, glue->nr_inputs, glue->nr_outputs));
+}
+
+static unsigned
+hw_glue_io_read_buffer_callback(device *me,
+ void *dest,
+ int space,
+ unsigned_word addr,
+ unsigned nr_bytes,
+ cpu *processor,
+ unsigned_word cia)
+{
+ hw_glue_device *glue = (hw_glue_device*)device_data(me);
+ int reg = ((addr - glue->address) / sizeof(unsigned_word)) % glue->nr_outputs;
+ if (nr_bytes != sizeof(unsigned_word)
+ || (addr % sizeof(unsigned_word)) != 0)
+ device_error(me, "missaligned read access (%d:0x%lx:%d) not supported",
+ space, (unsigned long)addr, nr_bytes);
+ *(unsigned_word*)dest = H2BE_4(glue->output[reg]);
+ DTRACE(glue, ("read - interrupt %d (0x%lx), level %d\n",
+ reg, (unsigned long) addr, glue->output[reg]));
+ return nr_bytes;
+}
+
+
+static unsigned
+hw_glue_io_write_buffer_callback(device *me,
+ const void *source,
+ int space,
+ unsigned_word addr,
+ unsigned nr_bytes,
+ cpu *processor,
+ unsigned_word cia)
+{
+ hw_glue_device *glue = (hw_glue_device*)device_data(me);
+ int reg = ((addr - glue->address) / sizeof(unsigned_word)) % max_nr_interrupts;
+ if (nr_bytes != sizeof(unsigned_word)
+ || (addr % sizeof(unsigned_word)) != 0)
+ device_error(me, "missaligned write access (%d:0x%lx:%d) not supported",
+ space, (unsigned long)addr, nr_bytes);
+ glue->output[reg] = H2BE_4(*(unsigned_word*)source);
+ DTRACE(glue, ("write - interrupt %d (0x%lx), level %d\n",
+ reg, (unsigned long) addr, glue->output[reg]));
+ device_interrupt_event(me, reg, glue->output[reg], processor, cia);
+ return nr_bytes;
+}
+
+static void
+hw_glue_interrupt_event(device *me,
+ int my_port,
+ device *source,
+ int source_port,
+ int level,
+ cpu *processor,
+ unsigned_word cia)
+{
+ hw_glue_device *glue = (hw_glue_device*)device_data(me);
+ int i;
+ if (my_port < glue->int_number
+ || my_port >= glue->int_number + glue->nr_inputs)
+ device_error(me, "interrupt %d outside of valid range", my_port);
+ glue->input[my_port - glue->int_number] = level;
+ switch (glue->type) {
+ case glue_io:
+ {
+ int port = my_port % glue->nr_outputs;
+ glue->output[port] = level;
+ DTRACE(glue, ("input - interrupt %d (0x%lx), level %d\n",
+ my_port,
+ (unsigned long)glue->address + port * sizeof(unsigned_word),
+ level));
+ break;
+ }
+ case glue_and:
+ glue->output[0] = glue->input[0];
+ for (i = 1; i < glue->nr_inputs; i++)
+ glue->output[0] &= glue->input[i];
+ DTRACE(glue, ("and - interrupt %d, level %d arrived - output %d\n",
+ my_port, level, glue->output[0]));
+ device_interrupt_event(me, 0, glue->output[0], processor, cia);
+ break;
+ default:
+ device_error(me, "operator not implemented");
+ break;
+ }
+}
+
+
+static const device_interrupt_port_descriptor hw_glue_interrupt_ports[] = {
+ { "int", 0, max_nr_interrupts },
+ { NULL }
+};
+
+
+static device_callbacks const hw_glue_callbacks = {
+ { hw_glue_init_address, NULL },
+ { NULL, }, /* address */
+ { hw_glue_io_read_buffer_callback,
+ hw_glue_io_write_buffer_callback, },
+ { NULL, }, /* DMA */
+ { hw_glue_interrupt_event, NULL, hw_glue_interrupt_ports }, /* interrupt */
+ { NULL, }, /* unit */
+ NULL, /* instance */
+};
+
+
+static void *
+hw_glue_create(const char *name,
+ const device_unit *unit_address,
+ const char *args)
+{
+ /* create the descriptor */
+ hw_glue_device *glue = ZALLOC(hw_glue_device);
+ return glue;
+}
+
+
+const device_descriptor hw_glue_device_descriptor[] = {
+ { "glue", hw_glue_create, &hw_glue_callbacks },
+ { "glue-and", hw_glue_create, &hw_glue_callbacks },
+ { "glue-nand", hw_glue_create, &hw_glue_callbacks },
+ { "glue-or", hw_glue_create, &hw_glue_callbacks },
+ { "glue-xor", hw_glue_create, &hw_glue_callbacks },
+ { "glue-nor", hw_glue_create, &hw_glue_callbacks },
+ { "glue-not", hw_glue_create, &hw_glue_callbacks },
+ { NULL },
+};
+
+#endif /* _HW_GLUE_C_ */
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