Convert all reg assignments to initial

As it turns out,

	reg foo = 0;

is not the same as

	reg foo; initial foo = 0;

but instead is equivalent to

	reg foo; always @(*) foo = 0;

This is rather silly. Convert all existing (lucky) examples to the
second form.

Signed-off-by: Sean Anderson <seanga2@gmail.com>

rtl/descramble.v

@@ -30,7 +30,8 @@ module descramble (
 	 * required in certain situations.
 	 */
 	localparam CONSECUTIVE_IDLES = 5'd29;
-	reg [4:0] idle_counter = CONSECUTIVE_IDLES, idle_counter_next;
+	reg [4:0] idle_counter, idle_counter_next;
+	initial idle_counter = CONSECUTIVE_IDLES;
 
 	/*
 	 * The amount of time without recieving consecutive idles before we

rtl/mdio.v

@@ -48,8 +48,9 @@ module mdio (
 	reg [15:0] data_next;
 
 	reg bad, bad_next, saved_err, saved_err_next;
-	reg [2:0] state = IDLE, state_next;
+	reg [2:0] state, state_next;
 	reg [4:0] state_counter, state_counter_next;
+	initial state = IDLE;
 
 	/*
 	 * NB: stb_next and data_next are assigned to stb and data_write every

rtl/mdio_io.v

@@ -23,7 +23,8 @@ module mdio_io (
 	reg mdi_next;
 	reg [1:0] last_mdc;
 	/* Two clock delay to allow the level shifter to reverse direction */
-	reg [2:0] oe = 0;
+	reg [2:0] oe;
+	initial oe = 0;
 
 `ifdef SYNTHESIS
 	SB_IO #(

rtl/mii_io_tx.v

@@ -26,7 +26,6 @@ module mii_io_tx (
 	reg ce_next, raw_enable;
 	reg tx_clk_p_next, tx_clk_n, tx_clk_n_next;
 	reg [2:0] counter, counter_next;
-	/* I have no idea why we need to use initial... */
 	initial counter = 4;
 
 	always @(*) begin

rtl/pmd_io.v

@@ -112,8 +112,10 @@ module pmd_io (
 	localparam C = 2;
 	localparam D = 3;
 
-	reg [1:0] state = A, state_next;
-	reg valid = 0, valid_next;
+	reg [1:0] state, state_next;
+	initial state = A;
+	reg valid, valid_next;
+	initial valid = 0;
 	reg [1:0] pmd_data_rx_next, pmd_data_rx_valid_next;
 	reg [3:0] rx_r, rx_f;
 

rtl/scramble.v

@@ -12,7 +12,8 @@ module scramble (
 );
 
 	reg lfsr_next;
-	reg [10:0] lfsr = 10'h3ff;
+	reg [10:0] lfsr;
+	initial lfsr = 10'h3ff;
 
 	always @(*) begin
 		lfsr_next = lfsr[8] ^ lfsr[10];