From 5789ee99286a487e1764bd9b52562e1a79b5d4e7 Mon Sep 17 00:00:00 2001
From: Jens Arnold <amiconn@rockbox.org>
Date: Sun, 10 Oct 2004 19:51:11 +0000
Subject: MMC hotswap handling in USB mode

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5247 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/ata_mmc.c | 11 +++++++----
 firmware/export/ata_mmc.h  |  2 ++
 firmware/usb.c             | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/firmware/drivers/ata_mmc.c b/firmware/drivers/ata_mmc.c
index 7b3b8d1ea8..faa4c1f187 100644
--- a/firmware/drivers/ata_mmc.c
+++ b/firmware/drivers/ata_mmc.c
@@ -135,18 +135,21 @@ static void swapcopy_sector(const unsigned char *buf);
 static int send_sector(const unsigned char *nextbuf, int timeout);
 static int send_single_sector(const unsigned char *buf, int timeout);
 
-static bool mmc_detect(void);
 static void mmc_tick(void);
 
 /* implementation */
 
-static int select_card(int card_no)
+void mmc_select_clock(int card_no)
 {
     if (card_no == 0)             /* internal */
         or_b(0x10, &PADRH);       /* set clock gate PA12  CHECKME: mask? */
     else                          /* external */
         and_b(~0x10, &PADRH);     /* clear clock gate PA12  CHECKME: mask?*/
-        
+}
+
+static int select_card(int card_no)
+{
+    mmc_select_clock(card_no);
     last_disk_activity = current_tick;
 
     if (!card_info[card_no].initialized)
@@ -760,7 +763,7 @@ void ata_spin(void)
 {
 }
 
-static bool mmc_detect(void)
+bool mmc_detect(void)
 {
     return adc_read(ADC_MMC_SWITCH) < 0x200 ? true : false;
 }
diff --git a/firmware/export/ata_mmc.h b/firmware/export/ata_mmc.h
index afc0dc24af..3e88b0e019 100644
--- a/firmware/export/ata_mmc.h
+++ b/firmware/export/ata_mmc.h
@@ -35,6 +35,8 @@ typedef struct
     unsigned int r2w_factor;
 } tCardInfo;
 
+void mmc_select_clock(int card_no);
+bool mmc_detect(void);
 unsigned long mmc_extract_bits(const unsigned long *p, unsigned int start,
                                unsigned int size);
 tCardInfo *mmc_card_info(int card_no);
diff --git a/firmware/usb.c b/firmware/usb.c
index 8f3169e5df..65069c486a 100644
--- a/firmware/usb.c
+++ b/firmware/usb.c
@@ -32,6 +32,9 @@
 #include "button.h"
 #include "sprintf.h"
 #include "hwcompat.h"
+#ifdef HAVE_MMC
+#include "ata_mmc.h"
+#endif
 
 extern void dbg_ports(void); /* NASTY! defined in apps/ */
 
@@ -47,6 +50,9 @@ void screen_dump(void);   /* Nasty again. Defined in apps/ too */
 /* Messages from usb_tick */
 #define USB_INSERTED    1
 #define USB_EXTRACTED   2
+#ifdef HAVE_MMC
+#define USB_REENABLE    3
+#endif
 
 /* Thread states */
 #define EXTRACTING      1
@@ -62,6 +68,10 @@ static int countdown;
 
 static int usb_state;
 
+#ifdef HAVE_MMC
+static int usb_mmc_countdown = 0;
+#endif
+
 /* FIXME: The extra 0x400 is consumed by fat_mount() when the fsinfo
    needs updating */
 static char usb_stack[DEFAULT_STACK_SIZE + 0x400];
@@ -75,6 +85,9 @@ static void usb_enable(bool on)
 #ifdef USB_ENABLE_ONDIOSTYLE
     if(on)
     {
+#ifdef HAVE_MMC
+        mmc_select_clock(mmc_detect() ? 1 : 0);
+#endif
         or_b(0x20, &PADRL); /* enable USB */
         and_b(~0x08, &PADRL); /* assert card detect */
     }
@@ -255,6 +268,22 @@ static void usb_thread(void)
                     }
                 }
                 break;
+
+#ifdef HAVE_MMC
+            case SYS_MMC_INSERTED:
+            case SYS_MMC_EXTRACTED:
+                if(usb_state == USB_INSERTED)
+                {
+                    usb_enable(false);
+                    usb_mmc_countdown = HZ/2; /* re-enable after 0.5 sec */
+                }
+                break;
+
+            case USB_REENABLE:
+                if(usb_state == USB_INSERTED)
+                    usb_enable(true);  /* reenable only if still inserted */
+                break;
+#endif
         }
     }
 }
@@ -308,6 +337,14 @@ static void usb_tick(void)
             }
         }
     }
+#ifdef HAVE_MMC
+    if(usb_mmc_countdown > 0)
+    {
+        usb_mmc_countdown--;
+        if (usb_mmc_countdown == 0)
+            queue_post(&usb_queue, USB_REENABLE, NULL);
+    }
+#endif
 }
 
 void usb_acknowledge(int id)
-- 
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