Changeset 1590e23 in mainline

Timestamp:

2010-06-25T19:53:13Z (14 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

d7ef14b

Parents:

adf6607

Message:

Drive the gta02 UART properly.

Location:

boot/arch/arm32

Files:

• include/main.h (modified) (2 diffs)
• src/putchar.c (modified) (2 diffs)

boot/arch/arm32/include/main.h

@@ -1 +1 @@
 /*
  * Copyright (c) 2007 Michal Kebrt
+ * Copyright (c) 2010 Jiri Svoboda
  * All rights reserved.
  *
@@ -39 +40 @@
 /** Address where characters to be printed are expected. */
 
-#ifdef MACHINE_gta02
-        /* FIXME: Need real S3C244x UART driver. */
-        #define VIDEORAM_ADDRESS  0x50008020
-#endif
+/** GTA02 serial console UART register addresses.
+ *
+ * This is UART channel 2 of the S3C244x CPU
+ */
+#define GTA02_SCONS_UTRSTAT     0x50008010
+#define GTA02_SCONS_UTXH        0x50008020
 
-#ifdef MACHINE_testarm
-        #define VIDEORAM_ADDRESS  0x10000000
-#endif
+/* Bits in UTXH register */
+#define S3C244X_UTXH_TX_EMPTY   0x00000004
 
-#ifdef MACHINE_integratorcp
-        #define VIDEORAM_ADDRESS  0x16000000
-#endif
+
+/** GXemul testarm serial console output register */
+#define TESTARM_SCONS_ADDR      0x10000000
+
+/** IntegratorCP serial console output register */
+#define ICP_SCONS_ADDR          0x16000000
 
 extern void bootstrap(void);

boot/arch/arm32/src/putchar.c

@@ -2 +2 @@
  * Copyright (c) 2007 Michal Kebrt
  * Copyright (c) 2009 Vineeth Pillai
+ * Copyright (c) 2010 Jiri Svoboda
  * All rights reserved.
  *
@@ -40 +41 @@
 #include <str.h>
 
+#ifdef MACHINE_gta02
+
+/** Send a byte to the gta02 serial console.
+ *
+ * @param byte          Byte to send.
+ */
+static void scons_sendb_gta02(uint8_t byte)
+{
+        volatile uint32_t *utrstat;
+        volatile uint32_t *utxh;
+
+        utrstat = (volatile uint32_t *) GTA02_SCONS_UTRSTAT;
+        utxh    = (volatile uint32_t *) GTA02_SCONS_UTXH;
+
+        /* Wait until transmitter is empty. */
+        while ((*utrstat & S3C244X_UTXH_TX_EMPTY) == 0)
+                ;
+
+        /* Transmit byte. */
+        *utxh = (uint32_t) byte;
+}
+
+#endif
+
+#ifdef MACHINE_testarm
+
+/** Send a byte to the GXemul testarm serial console.
+ *
+ * @param byte          Byte to send.
+ */
+static void scons_sendb_testarm(uint8_t byte)
+{
+        *((volatile uint8_t *) TESTARM_SCONS_ADDR) = byte;
+}
+
+#endif
+
+#ifdef MACHINE_integratorcp
+
+/** Send a byte to the IntegratorCP serial console.
+ *
+ * @param byte          Byte to send.
+ */
+static void scons_sendb_icp(uint8_t byte)
+{
+        *((volatile uint8_t *) ICP_SCONS_ADDR) = byte;
+}
+
+#endif
+
+/** Send a byte to the serial console.
+ *
+ * @param byte          Byte to send.
+ */
+static void scons_sendb(uint8_t byte)
+{
+#ifdef MACHINE_gta02
+        scons_sendb_gta02(byte);
+#endif
+#ifdef MACHINE_testarm
+        scons_sendb_testarm(byte);
+#endif
+#ifdef MACHINE_integratorcp
+        scons_senbd_integratorcp(byte);
+#endif
+}
+
+/** Display a character
+ *
+ * @param ch    Character to display
+ */
 void putchar(const wchar_t ch)
 {
         if (ch == '\n')
-                *((volatile char *) VIDEORAM_ADDRESS) = '\r';
-        
+                scons_sendb('\r');
+
         if (ascii_check(ch))
-                *((volatile char *) VIDEORAM_ADDRESS) = ch;
+                scons_sendb((uint8_t) ch);
         else
-                *((volatile char *) VIDEORAM_ADDRESS) = U_SPECIAL;
+                scons_sendb(U_SPECIAL);
 }