diff packages/devs/flash/arm/at91/current/src/flash_query.c @ 175:e7780801e1a7

Merge from eCos master repository on 2001-07-31-19:15:01-BST
author jlarmour
date Tue, 31 Jul 2001 21:15:36 +0000
parents
children e0c0827131d1
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new file mode 100644
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+++ b/packages/devs/flash/arm/at91/current/src/flash_query.c
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+//==========================================================================
+//
+//      flash_query.c
+//
+//      Flash programming - query device
+//
+//==========================================================================
+//####COPYRIGHTBEGIN####
+//                                                                          
+// -------------------------------------------                              
+// The contents of this file are subject to the Red Hat eCos Public License 
+// Version 1.1 (the "License"); you may not use this file except in         
+// compliance with the License.  You may obtain a copy of the License at    
+// http://www.redhat.com/                                                   
+//                                                                          
+// Software distributed under the License is distributed on an "AS IS"      
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
+// License for the specific language governing rights and limitations under 
+// the License.                                                             
+//                                                                          
+// The Original Code is eCos - Embedded Configurable Operating System,      
+// released September 30, 1998.                                             
+//                                                                          
+// The Initial Developer of the Original Code is Red Hat.                   
+// Portions created by Red Hat are                                          
+// Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc.                             
+// All Rights Reserved.                                                     
+// -------------------------------------------                              
+//                                                                          
+//####COPYRIGHTEND####
+//==========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):    gthomas
+// Contributors: gthomas
+// Date:         2001-07-17
+// Purpose:      
+// Description:  
+//              
+//####DESCRIPTIONEND####
+//
+//==========================================================================
+
+#include "flash.h"
+
+#include <pkgconf/hal.h>
+#include <cyg/hal/hal_arch.h>
+#include <cyg/hal/hal_cache.h>
+#include CYGHWR_MEMORY_LAYOUT_H
+
+//
+// CAUTION!  This code must be copied to RAM before execution.  Therefore,
+// it must not contain any code which might be position dependent!
+//
+
+#define CNT 2000*1000*10  // At least 20ms
+
+int
+flash_query(unsigned short *data)
+{
+    volatile unsigned short *ROM;
+    int cnt, cache_on;
+
+    HAL_DCACHE_IS_ENABLED(cache_on);
+    if (cache_on) {
+        HAL_DCACHE_SYNC();
+        HAL_DCACHE_DISABLE();
+    }
+
+    ROM = (volatile unsigned short *)0x01010000;
+
+    // Send lead-in sequence
+    ROM[FLASH_Key_Addr0] = FLASH_Key0;
+    ROM[FLASH_Key_Addr1] = FLASH_Key1;
+
+    // Send 'identify' command
+    ROM[FLASH_Key_Addr0] = FLASH_Read_ID;
+
+    // Need a delay of 20ms!
+    for (cnt = 0;  cnt < 50000;  cnt++) ;
+
+    data[0] = ROM[0];  // Manufacturer code
+    data[1] = ROM[1];  // Device identifier
+
+    // Send lead-in sequence
+    ROM[FLASH_Key_Addr0] = FLASH_Key0;
+    ROM[FLASH_Key_Addr1] = FLASH_Key1;
+
+    // Send 'reset' command
+    ROM[FLASH_Key_Addr0] = FLASH_Reset;
+
+    // Need a delay of 20ms!
+    for (cnt = 0;  cnt < 50000;  cnt++) ;
+
+    if (cache_on) {
+        HAL_DCACHE_ENABLE();
+    }
+
+    return 0;
+}