From 8f1ace7525057b6dfe8b6be96c987d6449057524 Mon Sep 17 00:00:00 2001
From: Jens Arnold <amiconn@rockbox.org>
Date: Sun, 22 May 2005 00:42:00 +0000
Subject: Ondio: Fix multivolume and hotswap for the old MMC clock circuit.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6502 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/ata_mmc.c | 17 ++++++++---------
 firmware/export/ata_mmc.h  |  2 +-
 firmware/usb.c             |  2 +-
 3 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/firmware/drivers/ata_mmc.c b/firmware/drivers/ata_mmc.c
index 6876ce0ec9..2e5bd3d78f 100644
--- a/firmware/drivers/ata_mmc.c
+++ b/firmware/drivers/ata_mmc.c
@@ -173,21 +173,20 @@ static void mmc_tick(void);
 
 /* implementation */
 
-void mmc_select_clock(int card_no)
+void mmc_enable_int_flash_clock(bool on)
 {
-    /* set clock gate for external card / reset for internal card if the
-     * MMC clock polarity bit is 0, vice versa if it is 1 */
-    if ((card_no != 0) ^ new_mmc_circuit)
-        or_b(0x10, &PADRH);       /* set clock gate PA12 */
-    else
+    /* Internal flash clock is enabled by setting PA12 high with the new
+     * clock circuit, and by setting it low with the old clock circuit */
+    if (on ^ new_mmc_circuit)
         and_b(~0x10, &PADRH);     /* clear clock gate PA12 */
+    else
+        or_b(0x10, &PADRH);       /* set clock gate PA12 */
 }
 
 static int select_card(int card_no)
 {
     mutex_lock(&mmc_mutex);
     led(true);
-    mmc_select_clock(card_no);
     last_disk_activity = current_tick;
 
     if (!card_info[card_no].initialized)
@@ -1061,7 +1060,6 @@ bool mmc_touched(void)
         unsigned char response;
 
         mutex_lock(&mmc_mutex);
-        mmc_select_clock(1);
         setup_sci1(7);             /* safe value */
         and_b(~0x02, &PADRH);      /* assert CS */
         send_cmd(CMD_SEND_OP_COND, 0, &response);
@@ -1144,6 +1142,7 @@ void ata_enable(bool on)
     {
         PBCR1 |= 0x08A0;    /* as SCK1, TxD1, RxD1 */
         IPRE &= 0x0FFF;     /* disable SCI1 interrupts for the CPU */
+        mmc_enable_int_flash_clock(true);  /* always enabled in SPI mode */
     }
     and_b(~0x80, &PADRL); /* assert reset */
     sleep(HZ/20);
@@ -1183,13 +1182,13 @@ int ata_init(void)
     }
 #endif
 
+    new_mmc_circuit = ((read_hw_mask() & MMC_CLOCK_POLARITY) != 0);
     ata_enable(true);
     
     if ( !initialized ) 
     {
         if (!last_mmc_status)
             mmc_status = MMC_UNTOUCHED;
-        new_mmc_circuit = ((read_hw_mask() & MMC_CLOCK_POLARITY) != 0);
 #ifdef HAVE_HOTSWAP
         queue_init(&mmc_queue);
         create_thread(mmc_thread, mmc_stack,
diff --git a/firmware/export/ata_mmc.h b/firmware/export/ata_mmc.h
index 9da93906ad..a4e9f71f09 100644
--- a/firmware/export/ata_mmc.h
+++ b/firmware/export/ata_mmc.h
@@ -39,7 +39,7 @@ typedef struct
     unsigned int block_exp;       /* block size exponent */
 } tCardInfo;
 
-void mmc_select_clock(int card_no);
+void mmc_enable_int_flash_clock(bool on);
 bool mmc_detect(void);
 unsigned long mmc_extract_bits(const unsigned long *p, unsigned int start,
                                unsigned int size);
diff --git a/firmware/usb.c b/firmware/usb.c
index 6095bcd65e..a514f8f0b4 100644
--- a/firmware/usb.c
+++ b/firmware/usb.c
@@ -88,7 +88,7 @@ static void usb_enable(bool on)
     if(on)
     {
 #ifdef HAVE_MMC
-        mmc_select_clock(mmc_detect() ? 1 : 0);
+        mmc_enable_int_flash_clock(!mmc_detect());
 #endif
         if (!(read_hw_mask() & MMC_CLOCK_POLARITY))
             and_b(~0x20, &PBDRH); /* old circuit needs SCK1 = low while on USB */
-- 
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