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[/] [openrisc/] [trunk/] [or1200/] [rtl/] [verilog/] [or1200_pic.v] - Blame information for rev 674

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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  OR1200's Programmable Interrupt Controller                  ////
////                                                              ////
////  This file is part of the OpenRISC 1200 project              ////
////  http://www.opencores.org/project,or1k                       ////
////                                                              ////
////  Description                                                 ////
////  PIC according to OR1K architectural specification.          ////
////                                                              ////
////  To Do:                                                      ////
////   None                                                       ////
////                                                              ////
////  Author(s):                                                  ////
////      - Damjan Lampret, lampret@opencores.org                 ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2000 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source 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 Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
// $Log: or1200_pic.v,v $
// Revision 2.0  2010/06/30 11:00:00  ORSoC
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "or1200_defines.v"
 
module or1200_pic(
        // RISC Internal Interface
        clk, rst, spr_cs, spr_write, spr_addr, spr_dat_i, spr_dat_o,
        pic_wakeup, intr,
 
        // PIC Interface
        pic_int
);
 
//
// RISC Internal Interface
//
input           clk;            // Clock
input           rst;            // Reset
input           spr_cs;         // SPR CS
input           spr_write;      // SPR Write
input   [31:0]   spr_addr;       // SPR Address
input   [31:0]   spr_dat_i;      // SPR Write Data
output  [31:0]   spr_dat_o;      // SPR Read Data
output          pic_wakeup;     // Wakeup to the PM
output          intr;           // interrupt
                                // exception request
 
//
// PIC Interface
//
input   [`OR1200_PIC_INTS-1:0]   pic_int;// Interrupt inputs
 
`ifdef OR1200_PIC_IMPLEMENTED
 
//
// PIC Mask Register bits (or no register)
//
`ifdef OR1200_PIC_PICMR
reg     [`OR1200_PIC_INTS-1:2]  picmr;  // PICMR bits
`else
wire    [`OR1200_PIC_INTS-1:2]  picmr;  // No PICMR register
`endif
 
//
// PIC Status Register bits (or no register)
//
`ifdef OR1200_PIC_PICSR
reg     [`OR1200_PIC_INTS-1:0]   picsr;  // PICSR bits
`else
wire    [`OR1200_PIC_INTS-1:0]   picsr;  // No PICSR register
`endif
 
//
// Internal wires & regs
//
wire            picmr_sel;      // PICMR select
wire            picsr_sel;      // PICSR select
wire    [`OR1200_PIC_INTS-1:0] um_ints;// Unmasked interrupts
reg     [31:0]   spr_dat_o;      // SPR data out
 
//
// PIC registers address decoder
//
assign picmr_sel = (spr_cs && (spr_addr[`OR1200_PICOFS_BITS] == `OR1200_PIC_OFS_PICMR)) ? 1'b1 : 1'b0;
assign picsr_sel = (spr_cs && (spr_addr[`OR1200_PICOFS_BITS] == `OR1200_PIC_OFS_PICSR)) ? 1'b1 : 1'b0;
 
//
// Write to PICMR
//
`ifdef OR1200_PIC_PICMR
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                picmr <= {1'b1, {`OR1200_PIC_INTS-3{1'b0}}};
        else if (picmr_sel && spr_write) begin
                picmr <=  spr_dat_i[`OR1200_PIC_INTS-1:2];
        end
`else
assign picmr = (`OR1200_PIC_INTS)'b1;
`endif
 
//
// Write to PICSR, both CPU and external ints
//
`ifdef OR1200_PIC_PICSR
always @(posedge clk or `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                picsr <= {`OR1200_PIC_INTS{1'b0}};
        else if (picsr_sel && spr_write) begin
                picsr <=  spr_dat_i[`OR1200_PIC_INTS-1:0] | um_ints;
        end else
                picsr <=  picsr | um_ints;
`else
assign picsr = pic_int;
`endif
 
//
// Read PIC registers
//
always @(spr_addr or picmr or picsr)
        case (spr_addr[`OR1200_PICOFS_BITS])    // synopsys parallel_case
`ifdef OR1200_PIC_READREGS
                `OR1200_PIC_OFS_PICMR: begin
                   spr_dat_o[`OR1200_PIC_INTS-1:0] = {picmr, 2'b11};
 `ifdef OR1200_PIC_UNUSED_ZERO
                   spr_dat_o[31:`OR1200_PIC_INTS] = {32-`OR1200_PIC_INTS{1'b0}};
 `endif
                end
`endif
          default: begin
             spr_dat_o[`OR1200_PIC_INTS-1:0] = picsr;
`ifdef OR1200_PIC_UNUSED_ZERO
             spr_dat_o[31:`OR1200_PIC_INTS] = {32-`OR1200_PIC_INTS{1'b0}};
`endif
          end
        endcase
 
//
// Unmasked interrupts
//
assign um_ints = pic_int & {picmr, 2'b11};
 
//
// Generate intr
//
assign intr = |um_ints;
 
//
// Assert pic_wakeup when intr is asserted
//
assign pic_wakeup = intr;
 
`else
 
//
// When PIC is not implemented, drive all outputs as would when PIC is disabled
//
assign intr = pic_int[1] | pic_int[0];
assign pic_wakeup= intr;
 
//
// Read PIC registers
//
`ifdef OR1200_PIC_READREGS
assign spr_dat_o[`OR1200_PIC_INTS-1:0] = `OR1200_PIC_INTS'b0;
`ifdef OR1200_PIC_UNUSED_ZERO
assign spr_dat_o[31:`OR1200_PIC_INTS] = 32-`OR1200_PIC_INTS'b0;
`endif
`endif
 
`endif
 
endmodule

Line No.	Rev	Author	Line
1	10	unneback	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// OR1200's Programmable Interrupt Controller ////`
4			`//// ////`
5			`//// This file is part of the OpenRISC 1200 project ////`
6	258	julius	`//// http://www.opencores.org/project,or1k ////`
7	10	unneback	`//// ////`
8			`//// Description ////`
9			`//// PIC according to OR1K architectural specification. ////`
10			`//// ////`
11			`//// To Do: ////`
12			`//// None ////`
13			`//// ////`
14			`//// Author(s): ////`
15			`//// - Damjan Lampret, lampret@opencores.org ////`
16			`//// ////`
17			`//////////////////////////////////////////////////////////////////////`
18			`//// ////`
19			`//// Copyright (C) 2000 Authors and OPENCORES.ORG ////`
20			`//// ////`
21			`//// This source file may be used and distributed without ////`
22			`//// restriction provided that this copyright statement is not ////`
23			`//// removed from the file and that any derivative work contains ////`
24			`//// the original copyright notice and the associated disclaimer. ////`
25			`//// ////`
26			`//// This source file is free software; you can redistribute it ////`
27			`//// and/or modify it under the terms of the GNU Lesser General ////`
28			`//// Public License as published by the Free Software Foundation; ////`
29			`//// either version 2.1 of the License, or (at your option) any ////`
30			`//// later version. ////`
31			`//// ////`
32			`//// This source is distributed in the hope that it will be ////`
33			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
34			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
35			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
36			`//// details. ////`
37			`//// ////`
38			`//// You should have received a copy of the GNU Lesser General ////`
39			`//// Public License along with this source; if not, download it ////`
40			`//// from http://www.opencores.org/lgpl.shtml ////`
41			`//// ////`
42			`//////////////////////////////////////////////////////////////////////`
43			`//`
44	141	marcus.erl	`// $Log: or1200_pic.v,v $`
45			`// Revision 2.0 2010/06/30 11:00:00 ORSoC`
46			`//`
47	10	unneback
48			`// synopsys translate_off`
49			`include "timescale.v"
50			`// synopsys translate_on`
51			`include "or1200_defines.v"
52
53			`module or1200_pic(`
54			`// RISC Internal Interface`
55			`clk, rst, spr_cs, spr_write, spr_addr, spr_dat_i, spr_dat_o,`
56			`pic_wakeup, intr,`
57
58			`// PIC Interface`
59			`pic_int`
60			`);`
61
62			`//`
63			`// RISC Internal Interface`
64			`//`
65			`input clk; // Clock`
66			`input rst; // Reset`
67			`input spr_cs; // SPR CS`
68			`input spr_write; // SPR Write`
69			`input [31:0] spr_addr; // SPR Address`
70			`input [31:0] spr_dat_i; // SPR Write Data`
71			`output [31:0] spr_dat_o; // SPR Read Data`
72			`output pic_wakeup; // Wakeup to the PM`
73			`output intr; // interrupt`
74			`// exception request`
75
76			`//`
77			`// PIC Interface`
78			`//`
79			input [`OR1200_PIC_INTS-1:0] pic_int;// Interrupt inputs
80
81			`ifdef OR1200_PIC_IMPLEMENTED
82
83			`//`
84			`// PIC Mask Register bits (or no register)`
85			`//`
86			`ifdef OR1200_PIC_PICMR
87			reg [`OR1200_PIC_INTS-1:2] picmr; // PICMR bits
88			`else
89			wire [`OR1200_PIC_INTS-1:2] picmr; // No PICMR register
90			`endif
91
92			`//`
93			`// PIC Status Register bits (or no register)`
94			`//`
95			`ifdef OR1200_PIC_PICSR
96			reg [`OR1200_PIC_INTS-1:0] picsr; // PICSR bits
97			`else
98			wire [`OR1200_PIC_INTS-1:0] picsr; // No PICSR register
99			`endif
100
101			`//`
102			`// Internal wires & regs`
103			`//`
104			`wire picmr_sel; // PICMR select`
105			`wire picsr_sel; // PICSR select`
106			wire [`OR1200_PIC_INTS-1:0] um_ints;// Unmasked interrupts
107			`reg [31:0] spr_dat_o; // SPR data out`
108
109			`//`
110			`// PIC registers address decoder`
111			`//`
112			assign picmr_sel = (spr_cs && (spr_addr[`OR1200_PICOFS_BITS] == `OR1200_PIC_OFS_PICMR)) ? 1'b1 : 1'b0;
113			assign picsr_sel = (spr_cs && (spr_addr[`OR1200_PICOFS_BITS] == `OR1200_PIC_OFS_PICSR)) ? 1'b1 : 1'b0;
114
115			`//`
116			`// Write to PICMR`
117			`//`
118			`ifdef OR1200_PIC_PICMR
119	358	julius	always @(posedge clk or `OR1200_RST_EVENT rst)
120			if (rst == `OR1200_RST_VALUE)
121	10	unneback	picmr <= {1'b1, {`OR1200_PIC_INTS-3{1'b0}}};
122			`else if (picmr_sel && spr_write) begin`
123	258	julius	picmr <= spr_dat_i[`OR1200_PIC_INTS-1:2];
124	10	unneback	`end`
125			`else
126			assign picmr = (`OR1200_PIC_INTS)'b1;
127			`endif
128
129			`//`
130			`// Write to PICSR, both CPU and external ints`
131			`//`
132			`ifdef OR1200_PIC_PICSR
133	358	julius	always @(posedge clk or `OR1200_RST_EVENT rst)
134			if (rst == `OR1200_RST_VALUE)
135	10	unneback	picsr <= {`OR1200_PIC_INTS{1'b0}};
136			`else if (picsr_sel && spr_write) begin`
137	258	julius	picsr <= spr_dat_i[`OR1200_PIC_INTS-1:0] \| um_ints;
138	10	unneback	`end else`
139	258	julius	`picsr <= picsr \| um_ints;`
140	10	unneback	`else
141			`assign picsr = pic_int;`
142			`endif
143
144			`//`
145			`// Read PIC registers`
146			`//`
147			`always @(spr_addr or picmr or picsr)`
148			case (spr_addr[`OR1200_PICOFS_BITS]) // synopsys parallel_case
149			`ifdef OR1200_PIC_READREGS
150			`OR1200_PIC_OFS_PICMR: begin
151	258	julius	spr_dat_o[`OR1200_PIC_INTS-1:0] = {picmr, 2'b11};
152			`ifdef OR1200_PIC_UNUSED_ZERO
153			spr_dat_o[31:`OR1200_PIC_INTS] = {32-`OR1200_PIC_INTS{1'b0}};
154			`endif
155			`end`
156	10	unneback	`endif
157	258	julius	`default: begin`
158			spr_dat_o[`OR1200_PIC_INTS-1:0] = picsr;
159	10	unneback	`ifdef OR1200_PIC_UNUSED_ZERO
160	258	julius	spr_dat_o[31:`OR1200_PIC_INTS] = {32-`OR1200_PIC_INTS{1'b0}};
161	10	unneback	`endif
162	258	julius	`end`
163	10	unneback	`endcase`
164	258	julius
165	10	unneback	`//`
166			`// Unmasked interrupts`
167			`//`
168			`assign um_ints = pic_int & {picmr, 2'b11};`
169
170			`//`
171			`// Generate intr`
172			`//`
173			`assign intr = \|um_ints;`
174
175			`//`
176			`// Assert pic_wakeup when intr is asserted`
177			`//`
178			`assign pic_wakeup = intr;`
179
180			`else
181
182			`//`
183			`// When PIC is not implemented, drive all outputs as would when PIC is disabled`
184			`//`
185			`assign intr = pic_int[1] \| pic_int[0];`
186			`assign pic_wakeup= intr;`
187
188			`//`
189			`// Read PIC registers`
190			`//`
191			`ifdef OR1200_PIC_READREGS
192			assign spr_dat_o[`OR1200_PIC_INTS-1:0] = `OR1200_PIC_INTS'b0;
193			`ifdef OR1200_PIC_UNUSED_ZERO
194			assign spr_dat_o[31:`OR1200_PIC_INTS] = 32-`OR1200_PIC_INTS'b0;
195			`endif
196			`endif
197
198			`endif
199
200			`endmodule`

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[/] [openrisc/] [trunk/] [or1200/] [rtl/] [verilog/] [or1200_pic.v] - Blame information for rev 674