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[PATCH] TX4927 processor can support different speeds

To: linux-mips@linux-mips.org
Subject: [PATCH] TX4927 processor can support different speeds
From: Manish Lachwani <mlachwani@mvista.com>
Date: Sun, 23 Jan 2005 11:23:18 -0800
Cc: ralf@linux-mips.org
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.4.1i
Hi Ralf,

Based on the feedback from Toshiba, the TX4927 processor can support different 
speeds. Attached patch takes care of that. If you find this approach 
reasonable, 
can you please check it in

Thanks
Manish Lachwani

Source: MontaVista Software, Inc. | http://www.mvista.com | Manish Lachwani 
<mlachwani@mvista.com>
MR: 9936
Type: Enhancement
Disposition: Submitted to linux-mips.org
Keywords:
Signed-off-by: Manish Lachwani  <mlachwani@mvista.com>
Description:
        Based on suggestion from Toshiba, TX4927 can operate at different
        speeds

Index: linux-2.6.10/arch/mips/Kconfig
===================================================================
--- linux-2.6.10.orig/arch/mips/Kconfig
+++ linux-2.6.10/arch/mips/Kconfig
@@ -901,6 +901,14 @@
          This Toshiba board is based on the TX4927 processor. Say Y here to
          support this machine type
 
+config TOSHIBA_TX4927_CPU_SPEED
+       int "CPU speed of the TX4927 processor (MHz)"
+       depends on TOSHIBA_RBTX4927
+       default 200
+       help
+         This sets the speed for the TX4927 processor. The default speed
+         is 200 MHz. 
+
 config TOSHIBA_FPCIB0
        bool "FPCIB0 Backplane Support"
        depends on TOSHIBA_RBTX4927
Index: linux-2.6.10/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_setup.c
===================================================================
--- linux-2.6.10.orig/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_setup.c
+++ linux-2.6.10/arch/mips/tx4927/toshiba_rbtx4927/toshiba_rbtx4927_setup.c
@@ -1008,7 +1008,11 @@
                                       mips_hpt_frequency,
                                       mips_hpt_frequency / 1000000);
 #else
-       mips_hpt_frequency = 100000000;
+       /*
+        * Default TX4927 processor speed is 200 MHz. However, it 
+        * can be configured by the user
+        */
+       mips_hpt_frequency = (CONFIG_TOSHIBA_TX4927_CPU_SPEED * 1000000) / 2;
 #endif
 
        TOSHIBA_RBTX4927_SETUP_DPRINTK(TOSHIBA_RBTX4927_SETUP_TIME_INIT, "+\n");
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