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authorWolfgang Denk <wd@denx.de>2007-08-18 21:56:57 +0200
committerWolfgang Denk <wd@denx.de>2007-08-18 21:56:57 +0200
commit909627dca4350fca789c117b028b686cfe53e716 (patch)
tree9ff1c96b5501884438605bd1814eadc03f02d8e1 /drivers/serial/mcfuart.c
parent8f22b671ebc4c625dbd58be19d844069dcc9660e (diff)
parent26667b7fa05a8bf2fc65fb9f3230b02b1a10c367 (diff)
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Merge with /home/wd/git/u-boot/custodian/u-boot-coldfire
Diffstat (limited to 'drivers/serial/mcfuart.c')
-rw-r--r--drivers/serial/mcfuart.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/serial/mcfuart.c b/drivers/serial/mcfuart.c
new file mode 100644
index 0000000..bc7077d
--- /dev/null
+++ b/drivers/serial/mcfuart.c
@@ -0,0 +1,131 @@
+/*
+ * (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>
+#include <asm/immap.h>
+#include <asm/uart.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_MCFUART
+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 */