From 983fda8391fa0ccfd4e0fd0bfb5a5e662e07b222 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Thu, 28 Oct 2004 00:09:35 +0000
Subject: Patch by TsiChung Liew, 23 Sep 2004: - add support for MPC8220 CPU -
 Add support for Alaska and Yukon boards

---
 cpu/mpc8220/uart.c | 128 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 cpu/mpc8220/uart.c

(limited to 'cpu/mpc8220/uart.c')

diff --git a/cpu/mpc8220/uart.c b/cpu/mpc8220/uart.c
new file mode 100644
index 0000000..fcf947d
--- /dev/null
+++ b/cpu/mpc8220/uart.c
@@ -0,0 +1,128 @@
+/*
+ * (C) Copyright 2004, Freescale, 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 PSC ports
+ * as serial console interface.
+ */
+
+#include <common.h>
+#include <mpc8220.h>
+
+#define PSC_BASE   MMAP_PSC1
+
+#if defined(CONFIG_PSC_CONSOLE)
+int psc_serial_init (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
+	u32 counter;
+
+	/* write to SICR: SIM2 = uart mode,dcd does not affect rx */
+	psc->cr = 0;
+	psc->ipcr_acr = 0;
+	psc->isr_imr = 0;
+
+	/* write to CSR: RX/TX baud rate from timers */
+	psc->sr_csr = 0xdd000000;
+
+	psc->mr1_2 = PSC_MR1_BITS_CHAR_8 | PSC_MR1_NO_PARITY | PSC_MR1_RX_RTS;
+	psc->mr1_2 = PSC_MR2_STOP_BITS_1 | PSC_MR2_TX_CTS;
+
+	/* Setting up BaudRate */
+	counter = ((gd->bus_clk / gd->baudrate)) >> 5;
+	counter++;
+
+	/* write to CTUR: divide counter upper byte */
+	psc->ctur = ((counter & 0xff00) << 16);
+	/* write to CTLR: divide counter lower byte */
+	psc->ctlr = ((counter & 0x00ff) << 24);
+
+	psc->cr = PSC_CR_RST_RX_CMD;
+	psc->cr = PSC_CR_RST_TX_CMD;
+	psc->cr = PSC_CR_RST_ERR_STS_CMD;
+	psc->cr = PSC_CR_RST_BRK_INT_CMD;
+	psc->cr = PSC_CR_RST_MR_PTR_CMD;
+
+	psc->cr = PSC_CR_RX_ENABLE | PSC_CR_TX_ENABLE;
+	return (0);
+}
+
+void psc_serial_putc (const char c)
+{
+	volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
+
+	if (c == '\n')
+		serial_putc ('\r');
+
+	/* Wait for last character to go. */
+	while (!(psc->sr_csr & PSC_SR_TXEMT));
+
+	psc->xmitbuf[0] = c;
+}
+
+void psc_serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}
+
+int psc_serial_getc (void)
+{
+	volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
+
+	/* Wait for a character to arrive. */
+	while (!(psc->sr_csr & PSC_SR_RXRDY));
+	return psc->xmitbuf[2];
+}
+
+int psc_serial_tstc (void)
+{
+	volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
+
+	return (psc->sr_csr & PSC_SR_RXRDY);
+}
+
+void psc_serial_setbrg (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
+	u32 counter;
+
+	counter = ((gd->bus_clk / gd->baudrate)) >> 5;
+	counter++;
+
+	/* write to CTUR: divide counter upper byte */
+	psc->ctur = ((counter & 0xff00) << 16);
+	/* write to CTLR: divide counter lower byte */
+	psc->ctlr = ((counter & 0x00ff) << 24);
+
+	psc->cr = PSC_CR_RST_RX_CMD;
+	psc->cr = PSC_CR_RST_TX_CMD;
+
+	psc->cr = PSC_CR_RX_ENABLE | PSC_CR_TX_ENABLE;
+}
+#endif /* CONFIG_PSC_CONSOLE */
-- 
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