General code modification for mpc7448hpc2 board support.

1. Add 7447A and 7448 processor support.
2. Add the following flags.

CFG_CONFIG_BUS_CLK : If the 74xx bus frequency can be configured dynamically
(such as by switch on board), this flag should be set.

CFG_EXCEPTION_AFTER_RELOCATE: If an exception occurs after the u-boot
relocates to RAM, this flag should be set.

CFG_SERIAL_HANG_IN_EXCEPTION: If the print out function will cause the
system hang in exception, this flag should be set.

There is a design issue for tsi108/109 pci configure  read. When pci scan
the slots, if there is no pci card, the tsi108/9 will cause a machine
check exception for mpc7448 processor.

Signed-off-by: Alexandre Bounine <alexandreb@tundra.com>
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>

1 files changed, 51 insertions, 4 deletions

diff --git a/cpu/74xx_7xx/speed.c b/cpu/74xx_7xx/speed.c
index 2dc510746d..d520794568 100644
--- a/cpu/74xx_7xx/speed.c
+++ b/cpu/74xx_7xx/speed.c
@@ -31,6 +31,8 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+extern unsigned long get_board_bus_clk(void);
+
 static const int hid1_multipliers_x_10[] = {
 	25,	/* 0000 - 2.5x */
 	75,	/* 0001 - 7.5x */
@@ -50,6 +52,41 @@ static const int hid1_multipliers_x_10[] = {
 	0	/* 1111 - off */
 };
 
+static const int hid1_7447A_multipliers_x_10[] = {
+	115,    /* 00000 - 11.5x  */
+	170,    /* 00001 - 17x    */
+	75,     /* 00010 -  7.5x  */
+	150,    /* 00011 - 15x    */
+	70,     /* 00100 -  7x    */
+	180,    /* 00101 - 18x    */
+	10,     /* 00110 - bypass */
+	200,    /* 00111 - 20x    */
+	20,     /* 01000 -  2x    */
+	210,    /* 01001 - 21x    */
+	65,     /* 01010 -  6.5x  */
+	130,    /* 01011 - 13x    */
+	85,     /* 01100 -  8.5x  */
+	240,    /* 01101 - 13x    */
+	95,     /* 01110 -  9.5x  */
+	90,     /* 01111 -  9x    */
+	30,     /* 10000 -  3x    */
+	105,    /* 10001 - 10.5x  */
+	55,     /* 10010 -  5.5x  */
+	110,    /* 10011 - 11x    */
+	40,     /* 10100 -  4x    */
+	100,    /* 10101 - 10x    */
+	50,     /* 10110 -  5x    */
+	120,    /* 10111 - 12x    */
+	80,     /* 11000 -  8x    */
+	140,    /* 11001 - 14x    */
+	60,     /* 11010 -  6x    */
+	160,    /* 11011 - 16x    */
+	135,    /* 11100 - 13.5x  */
+	280,    /* 11101 - 28x    */
+	0,      /* 11110 - off    */
+	125     /* 11111 - 12.5x  */
+};
+
 static const int hid1_fx_multipliers_x_10[] = {
 	00,	/* 0000 - off */
 	00,	/* 0001 - off */
@@ -89,8 +126,19 @@ int get_clocks (void)
 {
 	ulong clock = 0;
 
+#ifdef CFG_CONFIG_BUS_CLK
+	gd->bus_clk = get_board_bus_clk();
+#else
+	gd->bus_clk = CFG_BUS_CLK;
+#endif
+
 	/* calculate the clock frequency based upon the CPU type */
 	switch (get_cpu_type()) {
+	case CPU_7447A:
+	case CPU_7448:
+		clock = (gd->bus_clk / 10) * hid1_7447A_multipliers_x_10[(get_hid1 () >> 12) & 0x1F];
+		break;
+		
 	case CPU_7455:
 	case CPU_7457:
 		/*
@@ -98,12 +146,12 @@ int get_clocks (void)
 		 * Make sure division is done before multiplication to prevent 32-bit
 		 * arithmetic overflows which will cause a negative number
 		 */
-		clock = (CFG_BUS_CLK / 10) * hid1_multipliers_x_10[(get_hid1 () >> 13) & 0xF];
+		clock = (gd->bus_clk / 10) * hid1_multipliers_x_10[(get_hid1 () >> 13) & 0xF];
 		break;
 
 	case CPU_750GX:
 	case CPU_750FX:
-		clock = CFG_BUS_CLK * hid1_fx_multipliers_x_10[get_hid1 () >> 27] / 10;
+		clock = gd->bus_clk * hid1_fx_multipliers_x_10[get_hid1 () >> 27] / 10;
 		break;
 
 	case CPU_7450:
@@ -120,7 +168,7 @@ int get_clocks (void)
 		 * Make sure division is done before multiplication to prevent 32-bit
 		 * arithmetic overflows which will cause a negative number
 		 */
-		clock = (CFG_BUS_CLK / 10) * hid1_multipliers_x_10[get_hid1 () >> 28];
+		clock = (gd->bus_clk / 10) * hid1_multipliers_x_10[get_hid1 () >> 28];
 		break;
 
 	case CPU_UNKNOWN:
@@ -130,7 +178,6 @@ int get_clocks (void)
 	}
 
 	gd->cpu_clk = clock;
-	gd->bus_clk = CFG_BUS_CLK;
 
 	return (0);
 }