summaryrefslogtreecommitdiff
path: root/arch/ppc/cpu/74xx_7xx/speed.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/ppc/cpu/74xx_7xx/speed.c')
-rw-r--r--arch/ppc/cpu/74xx_7xx/speed.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/arch/ppc/cpu/74xx_7xx/speed.c b/arch/ppc/cpu/74xx_7xx/speed.c
new file mode 100644
index 0000000000..f2fdcd5dc3
--- /dev/null
+++ b/arch/ppc/cpu/74xx_7xx/speed.c
@@ -0,0 +1,185 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <74xx_7xx.h>
+#include <asm/processor.h>
+
+#ifdef CONFIG_AMIGAONEG3SE
+#include "../board/MAI/AmigaOneG3SE/via686.h"
+#endif
+
+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 */
+ 70, /* 0010 - 7x */
+ 10, /* 0011 - bypass */
+ 20, /* 0100 - 2x */
+ 65, /* 0101 - 6.5x */
+ 100, /* 0110 - 10x */
+ 45, /* 0111 - 4.5x */
+ 30, /* 1000 - 3x */
+ 55, /* 1001 - 5.5x */
+ 40, /* 1010 - 4x */
+ 50, /* 1011 - 5x */
+ 80, /* 1100 - 8x */
+ 60, /* 1101 - 6x */
+ 35, /* 1110 - 3.5x */
+ 0 /* 1111 - off */
+};
+
+/* PLL_CFG[0:4] table for cpu 7448/7447A/7455/7457 */
+static const int hid1_74xx_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 - 24x */
+ 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 */
+ 10, /* 0010 - bypass */
+ 10, /* 0011 - bypass */
+ 20, /* 0100 - 2x */
+ 25, /* 0101 - 2.5x */
+ 30, /* 0110 - 3x */
+ 35, /* 0111 - 3.5x */
+ 40, /* 1000 - 4x */
+ 45, /* 1001 - 4.5x */
+ 50, /* 1010 - 5x */
+ 55, /* 1011 - 5.5x */
+ 60, /* 1100 - 6x */
+ 65, /* 1101 - 6.5x */
+ 70, /* 1110 - 7x */
+ 75, /* 1111 - 7.5 */
+ 80, /* 10000 - 8x */
+ 85, /* 10001 - 8.5x */
+ 90, /* 10010 - 9x */
+ 95, /* 10011 - 9.5x */
+ 100, /* 10100 - 10x */
+ 110, /* 10101 - 11x */
+ 120, /* 10110 - 12x */
+};
+
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * Measure CPU clock speed (core clock GCLK1, GCLK2)
+ *
+ * (Approx. GCLK frequency in Hz)
+ */
+
+int get_clocks (void)
+{
+ ulong clock = 0;
+
+#ifdef CONFIG_SYS_BUS_CLK
+ gd->bus_clk = CONFIG_SYS_BUS_CLK; /* bus clock is a fixed frequency */
+#else
+ gd->bus_clk = get_board_bus_clk (); /* bus clock is configurable */
+#endif
+
+ /* calculate the clock frequency based upon the CPU type */
+ switch (get_cpu_type()) {
+ case CPU_7447A:
+ case CPU_7448:
+ case CPU_7455:
+ case CPU_7457:
+ /*
+ * Make sure division is done before multiplication to prevent 32-bit
+ * arithmetic overflows which will cause a negative number
+ */
+ clock = (gd->bus_clk / 10) *
+ hid1_74xx_multipliers_x_10[(get_hid1 () >> 12) & 0x1F];
+ break;
+
+ case CPU_750GX:
+ case CPU_750FX:
+ clock = (gd->bus_clk / 10) *
+ hid1_fx_multipliers_x_10[get_hid1 () >> 27];
+ break;
+
+ case CPU_7450:
+ case CPU_740:
+ case CPU_740P:
+ case CPU_745:
+ case CPU_750CX:
+ case CPU_750:
+ case CPU_750P:
+ case CPU_755:
+ case CPU_7400:
+ case CPU_7410:
+ /*
+ * Make sure division is done before multiplication to prevent 32-bit
+ * arithmetic overflows which will cause a negative number
+ */
+ clock = (gd->bus_clk / 10) *
+ hid1_multipliers_x_10[get_hid1 () >> 28];
+ break;
+
+ case CPU_UNKNOWN:
+ printf ("get_gclk_freq(): unknown CPU type\n");
+ clock = 0;
+ return (1);
+ }
+
+ gd->cpu_clk = clock;
+
+ return (0);
+}
+
+/* ------------------------------------------------------------------------- */