Changeset 8f9d70b in mainline for boot/arch/arm32/src/putchar.c

Timestamp:

2013-03-24T14:55:36Z (12 years ago)

Author:

Beniamino Galvani <b.galvani@…>

Branches:

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

Children:

0dfa93b0

Parents:

119b46e

Message:

Initial support for Raspberry Pi

File:

• boot/arch/arm32/src/putchar.c (modified) (2 diffs)

boot/arch/arm32/src/putchar.c

@@ -122 +122 @@
 #endif
 
+#ifdef MACHINE_raspberrypi
+
+static int raspi_init;
+
+static inline void write32(uint32_t addr, uint32_t data)
+{
+        *(volatile uint32_t *)(addr) = data;
+}
+
+static inline uint32_t read32(uint32_t addr)
+{
+        return *(volatile uint32_t *)(addr);
+}
+
+static void scons_init_raspi(void)
+{
+        write32(BCM2835_UART0_CR, 0x0);         /* Disable UART */
+        write32(BCM2835_UART0_ICR, 0x7f);       /* Clear interrupts */
+        write32(BCM2835_UART0_IBRD, 1);         /* Set integer baud rate */
+        write32(BCM2835_UART0_FBRD, 40);        /* Set fractional baud rate */
+        write32(BCM2835_UART0_LCRH,
+                BCM2835_UART0_LCRH_FEN |        /* Enable FIFOs */
+                BCM2835_UART0_LCRH_WL8);        /* Word length: 8 */
+        write32(BCM2835_UART0_CR,
+                BCM2835_UART0_CR_UARTEN |       /* Enable UART */
+                BCM2835_UART0_CR_TXE |          /* Enable TX */
+                BCM2835_UART0_CR_RXE);          /* Enable RX */
+}
+
+static void scons_sendb_raspi(uint8_t byte)
+{
+        if (!raspi_init) {
+                scons_init_raspi();
+                raspi_init = 1;
+        }
+
+        while (read32(BCM2835_UART0_FR) & BCM2835_UART0_FR_TXFF);
+
+        write32(BCM2835_UART0_DR, byte);
+}
+#endif
+
 /** Send a byte to the serial console.
  *
@@ -139 +181 @@
 #ifdef MACHINE_integratorcp
         scons_sendb_icp(byte);
+#endif
+#ifdef MACHINE_raspberrypi
+        scons_sendb_raspi(byte);
 #endif
 }