From 6c9e57810d6b07d4f05e4e7be14913b91083e2c3 Mon Sep 17 00:00:00 2001
From: Björn Stenberg <bjorn@haxx.se>
Date: Sat, 27 Apr 2002 14:19:00 +0000
Subject: Added ata_spindown() and use of ALT_STATUS instead of STATUS

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@259 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/ata.c | 42 +++++++++++++++++++++++++++++++++++++-----
 firmware/drivers/ata.h | 12 ++++++++++++
 2 files changed, 49 insertions(+), 5 deletions(-)

(limited to 'firmware/drivers')

diff --git a/firmware/drivers/ata.c b/firmware/drivers/ata.c
index cb4e1e6b90..24abecdb5c 100644
--- a/firmware/drivers/ata.c
+++ b/firmware/drivers/ata.c
@@ -31,6 +31,7 @@
 #define ATA_COMMAND     (*((volatile unsigned char*)0x06100107))
 #define ATA_STATUS      ATA_COMMAND
 #define ATA_CONTROL     (*((volatile unsigned char*)0x06100306))
+#define ATA_ALT_STATUS  ATA_CONTROL
 
 #define SELECT_LBA      0x40
 
@@ -52,7 +53,7 @@
 static int wait_for_bsy(void)
 {
     char timeout = current_tick + HZ;
-    while (TIME_BEFORE(current_tick, timeout) && (ATA_STATUS & STATUS_BSY))
+    while (TIME_BEFORE(current_tick, timeout) && (ATA_ALT_STATUS & STATUS_BSY))
         yield();
 
     if (TIME_BEFORE(current_tick, timeout))
@@ -65,21 +66,21 @@ static int wait_for_rdy(void)
 {
     if (!wait_for_bsy())
         return 0;
-    return ATA_STATUS & STATUS_RDY;
+    return ATA_ALT_STATUS & STATUS_RDY;
 }
 
 static int wait_for_start_of_transfer(void)
 {
     if (!wait_for_bsy())
         return 0;
-    return (ATA_STATUS & (STATUS_RDY|STATUS_DRQ)) == (STATUS_RDY|STATUS_DRQ);
-}    
+    return (ATA_ALT_STATUS & (STATUS_BSY|STATUS_DRQ)) == STATUS_DRQ;
+}
 
 static int wait_for_end_of_transfer(void)
 {
     if (!wait_for_bsy())
         return 0;
-    return (ATA_STATUS & (STATUS_RDY|STATUS_DRQ)) == STATUS_RDY;
+    return (ATA_ALT_STATUS & (STATUS_RDY|STATUS_DRQ)) == STATUS_RDY;
 }    
 
 int ata_read_sectors(unsigned long start,
@@ -107,6 +108,11 @@ int ata_read_sectors(unsigned long start,
 
         for (j=0; j<256; j++)
             ((unsigned short*)buf)[j] = SWAB16(ATA_DATA);
+
+#ifdef USE_INTERRUPT
+        /* reading the status register clears the interrupt */
+        j = ATA_STATUS;
+#endif
     }
 
     led_turn_off();
@@ -139,6 +145,11 @@ int ata_write_sectors(unsigned long start,
 
         for (j=0; j<256; j++)
             ATA_DATA = SWAB16(((unsigned short*)buf)[j]);
+
+#ifdef USE_INTERRUPT
+        /* reading the status register clears the interrupt */
+        j = ATA_STATUS;
+#endif
     }
 
     led_turn_off ();
@@ -193,6 +204,27 @@ static int freeze_lock(void)
     return 0;
 }
 
+int ata_spindown(int time)
+{
+    if (!wait_for_rdy())
+        return -1;
+
+    if ( time == -1 ) {
+        ATA_COMMAND = CMD_STANDBY_IMMEDIATE;
+    }
+    else {
+        if (time > 255)
+            return -1;
+        ATA_NSECTOR = time & 0xff;
+        ATA_COMMAND = CMD_STANDBY;
+    }
+
+    if (!wait_for_rdy())
+        return -1;
+
+    return 0;
+}
+
 int ata_hard_reset(void)
 {
     clear_bit(1,PADR);
diff --git a/firmware/drivers/ata.h b/firmware/drivers/ata.h
index 50cd85d755..38e45d9e45 100644
--- a/firmware/drivers/ata.h
+++ b/firmware/drivers/ata.h
@@ -19,6 +19,18 @@
 #ifndef __ATA_H__
 #define __ATA_H__
 
+/*
+  ata_spindown() time values:
+   -1     Immediate spindown
+   0      Timeout disabled
+   1-240  (time * 5) seconds
+   241-251((time - 240) * 30) minutes
+   252    21 minutes
+   253    Period between 8 and 12 hrs
+   254    Reserved
+   255    21 min 15 s
+*/
+extern int ata_spindown(int time);
 extern int ata_hard_reset(void);
 extern int ata_soft_reset(void);
 extern int ata_init(void);
-- 
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