Merge git://www.denx.de/git/u-boot

1 files changed, 133 insertions, 0 deletions

diff --git a/drivers/serial/mcfuart.c b/drivers/serial/mcfuart.c
new file mode 100644
index 0000000..88f3eb1
--- /dev/null
+++ b/drivers/serial/mcfuart.c
@@ -0,0 +1,133 @@
+/*
+ * (C) Copyright 2004-2007 Freescale Semiconductor, Inc.
+ * TsiChung Liew, Tsi-Chung.Liew@freescale.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+/*
+ * Minimal serial functions needed to use one of the uart ports
+ * as serial console interface.
+ */
+
+#include <common.h>
+
+#ifdef CONFIG_MCFUART
+
+#include <asm/immap.h>
+#include <asm/uart.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+extern void uart_port_conf(void);
+
+int serial_init(void)
+{
+	volatile uart_t *uart;
+	u32 counter;
+
+	uart = (volatile uart_t *)(CFG_UART_BASE);
+
+	uart_port_conf();
+
+	/* write to SICR: SIM2 = uart mode,dcd does not affect rx */
+	uart->ucr = UART_UCR_RESET_RX;
+	uart->ucr = UART_UCR_RESET_TX;
+	uart->ucr = UART_UCR_RESET_ERROR;
+	uart->ucr = UART_UCR_RESET_MR;
+	__asm__("nop");
+
+	uart->uimr = 0;
+
+	/* write to CSR: RX/TX baud rate from timers */
+	uart->ucsr = (UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK);
+
+	uart->umr = (UART_UMR_BC_8 | UART_UMR_PM_NONE);
+	uart->umr = UART_UMR_SB_STOP_BITS_1;
+
+	/* Setting up BaudRate */
+	counter = (u32) (gd->bus_clk / (gd->baudrate));
+	counter >>= 5;
+
+	/* write to CTUR: divide counter upper byte */
+	uart->ubg1 = (u8) ((counter & 0xff00) >> 8);
+	/* write to CTLR: divide counter lower byte */
+	uart->ubg2 = (u8) (counter & 0x00ff);
+
+	uart->ucr = (UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED);
+
+	return (0);
+}
+
+void serial_putc(const char c)
+{
+	volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
+
+	if (c == '\n')
+		serial_putc('\r');
+
+	/* Wait for last character to go. */
+	while (!(uart->usr & UART_USR_TXRDY)) ;
+
+	uart->utb = c;
+}
+
+void serial_puts(const char *s)
+{
+	while (*s) {
+		serial_putc(*s++);
+	}
+}
+
+int serial_getc(void)
+{
+	volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
+
+	/* Wait for a character to arrive. */
+	while (!(uart->usr & UART_USR_RXRDY)) ;
+	return uart->urb;
+}
+
+int serial_tstc(void)
+{
+	volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
+
+	return (uart->usr & UART_USR_RXRDY);
+}
+
+void serial_setbrg(void)
+{
+	volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE);
+	u32 counter;
+
+	counter = ((gd->bus_clk / gd->baudrate)) >> 5;
+	counter++;
+
+	/* write to CTUR: divide counter upper byte */
+	uart->ubg1 = ((counter & 0xff00) >> 8);
+	/* write to CTLR: divide counter lower byte */
+	uart->ubg2 = (counter & 0x00ff);
+
+	uart->ucr = UART_UCR_RESET_RX;
+	uart->ucr = UART_UCR_RESET_TX;
+
+	uart->ucr = UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED;
+}
+#endif				/* CONFIG_MCFUART */